CN209105475U - LED lights - Google Patents

Abstract

The utility model discloses a kind of LED light, one end or both ends have pin, it and include the rectification circuit, filter circuit and LED drive module being mutually coupled, the LED light also has filament artificial circuit, and the filament artificial circuit couples an at least pin of described LED light one end.Technical solution according to the present utility model, filament artificial circuit is coupled between two pins of described LED light the same end, for lamp tube drive circuit for detecting with filament at the beginning of starting, whether the filament for detecting fluorescent tube is normal, i.e., short-circuit or open circuit abnormal conditions do not occur for detecting filament.In the case where filament artificial circuit works normally, the lamp tube drive circuit of filament detecting confirms that filament is normal, and so that lamp tube drive circuit is normally started driving LED light and shine, therefore filament artificial circuit can enable the LED light for not having filament be compatible with the lamp holder of the existing lamp tube drive circuit with filament detecting, bring convenience for the use of user.

Description

LED lights

This application is a divisional application of a utility model patent application with the application number of 201590001018.1, the application date of September 25, 2015, and the invention and creation name of LED straight tube lamp

technical field

The utility model relates to the field of lighting devices, in particular to an LED (light-emitting diode) lamp and its components, including a light source, an electronic component and a lamp holder.

Background technique

LED lighting technology is rapidly developing and replacing traditional incandescent and fluorescent lamps. Compared with fluorescent lamps filled with inert gas and mercury, LED straight tube lamps do not need to be filled with mercury. Therefore, in a variety of home or workplace lighting systems dominated by lighting options such as traditional fluorescent bulbs and tubes, it is no surprise that LED straight lamps are gradually becoming a highly anticipated lighting option. The advantages of LED straight tube lamps include improved durability and longer life and lower energy consumption. So, all things considered, LED straight tubes will be a cost-effective lighting option.

Known LED straight tube lamps generally include a lamp tube, a circuit board with a light source inside the lamp tube, and lamp caps at both ends of the lamp tube.

Commercially available electronic ballasts can be mainly divided into two types: Instant Start electronic ballasts and Program Start electronic ballasts. The electronic ballast has a resonant circuit, and its drive design matches the load characteristics of the fluorescent lamp, that is, the electronic ballast is a capacitive component before the fluorescent lamp is lit, and a resistive component after the fluorescent lamp is lit, providing a corresponding starting program, and So that the fluorescent light can be lit correctly. The LED is a nonlinear component, and the characteristics of the fluorescent lamp are completely different. Therefore, the LED straight tube lamp will affect the resonance design of the electronic ballast and cause compatibility problems. Generally speaking, program-start electronic ballasts detect the existence of filaments in fluorescent lamps, which cannot be supported by traditional LED driving circuits, resulting in failure of detection and failure to start. In addition, the electronic ballast is equivalent to a current source. When used as the power supply of the DC-DC converter for the LED straight tube lamp, it is easy to cause overcurrent and overvoltage or undercurrent and undervoltage, thus causing damage to the electronic components or the LED straight tube lamp. Unable to provide stable lighting.

Then, the driving signal used for LED driver is DC signal, but the driving signal of fluorescent lamp is low-frequency and low-voltage AC signal of mains or high-frequency and high-voltage AC signal of electronic ballast, and even used in emergency lighting, emergency lighting battery is a DC signal. Due to the large difference in voltage and frequency range between different driving signals, simply performing rectification to generate the DC driving signal required in the LED straight tube lamp cannot achieve the compatibility of the driving system of the LED straight tube lamp and the traditional fluorescent lamp.

Furthermore, the lighting used to directly replace the traditional fluorescent lamps may have components to simulate the filament in the fluorescent lamps, but these common simulation components have the risk of losing the simulation function after failure, or their service life is not long. The use of the lamp is not safe enough for the user during the lighting process. In addition, because there are many types and design methods of traditional ballasts, the characteristics of various types are very different. Therefore, if traditional ballasts are used to supply power to LED lamps, the current of LED lamps is likely to be high, which increases overvoltage/overvoltage. risk of flow or energy consumption.

In view of the above problems, the present invention and its embodiments are proposed below.

SUMMARY OF THE INVENTION

In view of this, the present invention provides an LED lamp, which has a filament simulation circuit, which can improve the compatibility of a lamp driving circuit with filament detection, such as a program-activated ballast. Other beneficial effects and advantages of the present invention, as well as unconventional alternative implementations, will be described in conjunction with the specific embodiments.

To achieve the above purpose, according to an aspect of the present invention, an LED lamp is provided.

The LED lamp of the present invention has pins at one end or both ends, and includes a rectifier circuit, a filter circuit, and an LED driving module that are coupled to each other. The LED lamp also has a filament simulation circuit. The filament simulation circuit at least one pin is coupled to one end of the LED lamp; the LED lamp also has a lamp tube and a lamp board, and the lamp board is arranged in the lamp tube; the LED driving module includes an LED unit for emitting light , the LED unit includes LEDs and is arranged on the light board.

Optionally, the filament simulation circuit includes a capacitor (1663) and a resistor (1665) connected in parallel; two ends of the capacitor (1663) and the resistor (1665) are respectively coupled to two pins at the same end of the LED lamp.

Optionally, the filament simulation circuit is coupled between the LED driving module (530) and a pin (501/502/503/504) at one end of the LED lamp, and the filament simulation circuit includes a parallel connection A resistor (1665) and a capacitor (1663) are provided, and a parallel common terminal of the capacitor (1663) and the resistor (1665) is coupled to the LED driving module (530).

Optionally, the rectifier circuit is coupled between the filament simulation circuit and the LED driving module (530).

Optionally, the filament simulation circuit includes a capacitor (1663) and a resistor (1665) connected in parallel; the capacitor (1663) and the resistor (1665) are coupled to the LED driving module (530) and one end of the LED lamp between a pin (501) of the LED lamp; the LED lamp also includes another filament simulation circuit, and the other filament simulation circuit includes another capacitor (1663) and another resistor (1665) connected in parallel; the other A capacitor (1663) and another resistor (1665) are coupled between the LED driving module (530) and another pin (502) at the end of the LED lamp.

Optionally, the filament simulation circuit includes a first capacitor (1763), a second capacitor (1764), a first resistor (1765), and a second resistor (1766), wherein: the first capacitor (1763) and the second A capacitor (1764) is connected in series between two pins at the same end of the LED lamp; a first resistor (1765) and a second resistor (1766) are also connected in series between the two pins; the first capacitor ( 1763) and the connection point of the second capacitor (1764) are coupled to the connection point of the first resistor (1765) and the second resistor (1766).

Optionally, the filament simulation circuit includes a negative temperature coefficient resistor, which is coupled between two pins at the same end of the LED lamp.

Optionally, the resistance value of the filament simulation circuit is 10 ohms or more at 25°C; when the LED lamp is normally started, the resistance value of the filament simulation circuit is reduced to 2-10 ohms.

Optionally, the LED lamp further has a capacitor (925); the capacitor is coupled between the filament simulation circuit and the rectifier circuit, and is connected in parallel with the rectifier circuit.

Optionally, the rectifier circuit includes a first diode (611), a second diode (612), a third diode (613), and a fourth diode (614), wherein the first diode (614) The cathode of the second diode (612) and the anode of the fourth diode (614) are coupled to one of the two pins (501) at the same end of the LED lamp, and the first diode ( The cathode of 611) and the anode of the third diode (613) are coupled to the other pin (502) of the two pins, the first diode (611) and the second diode The anode of (612) is connected, and the third diode (613) is connected to the cathode of the fourth diode (614).

Optionally, two ends of the capacitor are respectively coupled to two pins at the same end of the LED lamp.

Optionally, the LED lamp further has a ballast detection circuit (1590, 1690); the ballast detection circuit is coupled between the filament simulation circuit and the rectifier circuit, and is connected with the rectifier circuit The circuits are connected in parallel; and the ballast detection circuit is used to detect the signal input from a pin (501) or another pin (502) at the same end of the LED light to determine the ballast detection Whether the circuit conducts a current generated by the signal.

Optionally, the ballast detection circuit includes an inductor (1694) or a switch (1799).

Optionally, the ballast detection circuit includes an inductor (1694) and a triac (1699) connected in series; and the ballast detection circuit determines whether to trigger the The triac (1699) is turned on.

Optionally, the rectifier circuit includes a first rectifier circuit (510) and a second rectifier circuit (540/810), and the ballast detection circuit is coupled to the first rectifier circuit (510) and the second rectifier circuit between the circuits (540/810), and one end of the ballast detection circuit is connected to the first rectifier circuit (510), and the other end of the ballast detection circuit is connected to the second rectifier circuit (540). /810) connection.

Optionally, the LED driving module includes a driving circuit (1530) and an LED module (630), and the driving circuit is used for power conversion to drive the LED module to emit light.

Optionally, the drive circuit includes a controller (1531) and a conversion circuit (1532); the conversion circuit is coupled to the output end of the filter circuit to receive the filtered signal, and according to the control of the controller, converts the The filtered signal is converted into a driving signal and output to drive the LED module.

Optionally, the rectifier circuit is used to receive the signal input from one end or both ends of the LED lamp, and the drive circuit is used to receive the rectified input signal, and to rectify the rectified input signal. The input signal is used for power conversion.

Optionally, the filter circuit is configured to receive the output of the rectifier circuit, so as to generate the rectified input signal.

Optionally, the drive circuit includes a controller (2631) and a conversion circuit (2632); the conversion circuit (2632) includes a switch circuit (2635) and a tank circuit (2638), the tank circuit (2638) is coupled to the LED module (630); the controller (2631) is coupled to the output end of the driving circuit, and is used for receiving a current detection signal (S539) to determine the conduction of the switch circuit (2635) and cut-off time, and then control the driving signal output by the driving circuit; wherein, the current detection signal (S539) represents the current of the energy storage circuit (2638), or represents the current flowing through the LED module. .

Optionally, the tank circuit (2638) includes an inductor, and the drive circuit includes an inductor, and the inductor of the drive circuit is used for mutual inductance with the inductor in the tank circuit (2638) to detect measure current.

Optionally, the filament simulation circuit is coupled between the LED driving module (530) and at least one pin at one end of the LED lamp, and the filament simulation circuit includes a resistor (1665) or a capacitor ( 1663).

Optionally, the LED lamp further has a terminal conversion circuit (541), and the terminal conversion circuit is coupled between the LED driving module (530) and two pins at the same end of the LED lamp.

Optionally, the terminal conversion circuit includes a capacitor and a resistor connected in parallel.

Optionally, the rectifier circuit includes the terminal conversion circuit, or is coupled between the terminal conversion circuit and the LED driving module (530).

Optionally, the filament simulation circuit constitutes an endpoint conversion circuit (541), and the filament simulation circuit includes two resistors, which are connected in series between two pins at the same end of the LED lamp, and between the two resistors. The connection point of is coupled to the LED driving module (530).

According to another aspect of the present invention, another LED lamp is provided.

The LED lamp of the present invention has pins at one end or both ends, and includes a rectifier circuit, a filter circuit, and an LED module (630) coupled to each other. The LED lamp also has a lamp tube and a lamp board, so The lamp board is arranged in the lamp tube; the LED module includes an LED unit for emitting light, the LED unit includes an LED and is arranged on the lamp plate; the LED lamp also has a capacitor and another a capacitor, the capacitor is coupled to at least one pin (501/502) at one end of the LED lamp, and the other capacitor is coupled to at least one pin (503/504) at the other end of the LED lamp; The rectifier circuit is coupled between the capacitor (1663/642/743/843/1763/825) and the LED module (630), and is also coupled to the other capacitor and the LED module (630) between, the rectifier circuit is used to rectify the signal input from one end or both ends of the LED lamp; the filter circuit is coupled between the rectifier circuit and the LED module (630), and for filtering the signal from the rectifier circuit.

According to yet another aspect of the present invention, another LED lamp is provided.

The LED lamp of the present invention has pins at one end or both ends, and includes a rectifier circuit, a filter circuit, and an LED module (630) coupled to each other. The LED lamp also has a lamp tube and a lamp board, so The lamp board is arranged in the lamp tube; the LED module (630) includes an LED unit for emitting light, the LED unit includes an LED and is arranged on the lamp plate; the LED lamp also has a limited a current-limiting circuit, the current-limiting circuit is coupled to a pin (501/502) at one end of the LED lamp and used to limit the current flowing through the LED lamp; the rectifier circuit is coupled to the current-limiting circuit and used to rectify the signal input from one end or both ends of the LED lamp; the filter circuit is coupled between the rectifier circuit and the LED module (630), and is used to rectify the signal from the rectifier The signal of the circuit is filtered; the LED lamp also has a first filament simulation circuit and a second filament simulation circuit, the first filament simulation circuit is coupled to the pin (501/502) at one end of the LED lamp, the The second filament simulation circuit is coupled to the pin (503/504) at the other end of the LED lamp.

According to yet another aspect of the present invention, another LED lamp is provided.

The LED lamp of the present invention has pins at one end or both ends, and includes a first rectifier circuit (510), a second rectifier circuit (540), a filter circuit, and an LED module (630) coupled to each other, The LED lamp further has a lamp tube and a lamp board, and the lamp board is arranged in the lamp tube; the LED module (630) includes an LED unit (632/732) for lighting, and the LED unit ( 632/732) includes an LED and is disposed on the lamp board; the first rectifier circuit (510) is coupled to a pin at one end of the LED lamp and includes a diode, and the second rectifier circuit (540) is coupled to The pin (503) connected to the other end of the LED lamp includes two diodes (711, 712; 811, 812), and the connection points between the two diodes of the second rectifier circuit (540) belong to the two diodes respectively The anode and cathode of the diode; the first rectifier circuit (510) and the second rectifier circuit (540) are used to rectify the signal input from one or both ends of the LED lamp; the filter circuit is coupled to connected between the rectifier circuit and the LED module (630), and used for filtering the signal from the rectifier circuit; the LED lamp also has an EMI reducing element, which is coupled to the other end of the LED lamp between the pin (503) of the second rectifier circuit (540) and the connection point between the two diodes of the second rectifier circuit (540).

Optionally, the capacitor (1663/1763) and another capacitor (1663/1763) are used as a filament simulation circuit, and the filament simulation circuit is coupled to the LED module (630) and one end of the LED lamp. between pins (501/502/503/504).

Optionally, the filament simulation circuit includes the capacitor (1663/1763) and the resistor (1665/1765) connected in parallel.

Optionally, both ends of the capacitor (1663/1763) and the resistor (1665/1765) are respectively coupled to two pins at the same end of the LED lamp.

Optionally, the capacitor (642/743/843) and the other capacitor (642/743/843) are used as a terminal conversion circuit (541) or have a current limiting function.

Optionally, the rectifier circuit includes a first rectifier circuit (510) and a second rectifier circuit (540), the first rectifier circuit (510) includes or is coupled to the current limiting circuit, the second rectifier circuit (540) A circuit (540) is coupled between the LED module (630) and the second filament simulation circuit.

Optionally, the first filament simulation circuit includes an impedance element coupled between two pins (501, 502) at one end of the LED lamp; the second filament simulation circuit includes an impedance element coupled to the LED lamp Between the two pins (503, 504) at the other end.

Optionally, the EMI reducing element includes a capacitor (1663/1763/1764) and acts as a filament emulation circuit.

Optionally, the EMI reducing element (642/743/744/843/844/842) belongs to the terminal conversion circuit (541) and has the function of limiting current.

Optionally, the filter circuit includes a capacitor (625) and is connected in parallel with the LED units (632/732), and is coupled to one of the two diodes (811) of the second rectifier circuit (540) between the positive electrode and the negative electrode of the other (812).

Optionally, the first rectifier circuit (510) includes a first diode (611), a second diode (612), a third diode (613), and a fourth diode (614) , wherein the cathode of the second diode (612) and the anode of the fourth diode (614) are coupled to one of the two pins (501) at one end of the LED lamp, and the first The cathode of a diode (611) and the anode of the third diode (613) are coupled to the other pin (502) of the two pins of the end, and the first diode (611) The anode of the second diode (612) is connected, and the third diode (613) is connected to the cathode of the fourth diode (614).

Optionally, the LED lamp further has an impedance element (828), and the impedance element (828) and the capacitor (825) or another capacitor (825) are connected in parallel with a pin (501) at one end of the LED lamp /502/503/504) and the rectifier circuit (510/540).

According to the technical solution of the present invention, the filament simulation circuit is coupled to at least one pin located at one end of the LED lamp, so that the lamp drive circuit with filament detection can detect whether the filament of the lamp is normal at the beginning of startup. , that is, to detect the abnormal situation that the filament is not short-circuited or open-circuited. When the filament simulation circuit works normally, the lamp drive circuit detected by the filament will confirm that the filament is normal, and the lamp drive circuit will normally start to drive the LED lamp to emit light. Therefore, the filament simulation circuit can make the LED lamp without filament compatible The existing lamp holder with a lamp driving circuit for filament detection brings convenience to users.

Description of drawings

The accompanying drawings are used for better understanding of the present invention and do not constitute an improper limitation of the present invention. in:

1 is a perspective view showing an LED straight tube lamp according to an embodiment of the present invention;

FIG. 2 is an exploded perspective view showing the LED straight tube light of FIG. 1 ; FIG. 3A is a block diagram of an exemplary power module 250 of the LED straight tube light according to some embodiments of the present invention;

3B is a block diagram of an exemplary power module 250 for an LED straight tube lamp according to some embodiments of the present invention;

3C is a block diagram of an exemplary LED lamp according to some embodiments of the present invention;

3D is a block diagram of an exemplary power module 250 of an LED straight tube lamp according to some embodiments of the present invention;

3E is a block diagram of an LED lamp according to some embodiments of the present invention;

4A is a schematic diagram of a rectifier circuit according to some embodiments of the present invention;

4B is a schematic diagram of a rectifier circuit according to some embodiments of the present invention;

4C is a schematic diagram of a rectifier circuit according to some embodiments of the present invention;

4D is a schematic diagram of a rectifier circuit according to some embodiments of the present invention;

5A is a schematic diagram of an endpoint conversion circuit according to some embodiments of the present invention;

5B is a schematic diagram of an endpoint conversion circuit according to some embodiments of the present invention;

5C is a schematic diagram of an endpoint conversion circuit according to some embodiments of the present invention;

5D is a schematic diagram of an endpoint conversion circuit according to some embodiments of the present invention;

6A is a block diagram of a filter circuit according to some embodiments of the present invention;

6B is a schematic diagram of a filtering unit according to some embodiments of the present invention;

6C is a schematic diagram of a filtering unit according to some embodiments of the present invention;

6D is a schematic diagram of a filtering unit according to some embodiments of the present invention;

6E is a schematic diagram of a filtering unit according to some embodiments of the present invention;

7A is a schematic diagram of an LED module according to some embodiments of the present invention;

7B is a schematic diagram of an LED module according to some embodiments of the present invention;

7C is a plan view of a circuit layout of an LED module according to some embodiments of the present invention;

7D is a plan view of a circuit layout of an LED module according to some embodiments of the present invention;

7E is a plan view of a circuit layout of an LED module according to some embodiments of the present invention;

8A is a block diagram of an exemplary power module for an LED lamp according to some embodiments of the present invention;

8B is a block diagram of a drive circuit according to some embodiments of the present invention;

8C is a schematic diagram of a driving circuit according to some embodiments of the present invention;

8D is a schematic diagram of a driving circuit according to some embodiments of the present invention;

8E is a schematic diagram of a driving circuit according to some embodiments of the present invention;

8F is a schematic diagram of a drive circuit according to some embodiments of the present invention;

8G is a block diagram of a driver circuit according to some embodiments of the present invention;

8H is a schematic diagram of the relationship between the voltage Vin and the current Iout according to an embodiment of the present invention;

9A is a block diagram of an exemplary power module for an LED lamp according to some embodiments of the present invention;

9B is a schematic diagram of an anti-flicker circuit according to an embodiment of the present invention;

10A is a block diagram of an exemplary power module for an LED lamp according to some embodiments of the present invention;

10B is a schematic diagram of a protection circuit according to an embodiment of the present invention;

11A is a block diagram of an exemplary power module for an LED lamp according to some embodiments of the present invention;

11B is a schematic diagram of a mode switching circuit according to some embodiments of the present invention;

11C is a schematic diagram of a mode switching circuit according to some embodiments of the present invention;

11D is a schematic diagram of a mode switching circuit according to some embodiments of the present invention;

11E is a schematic diagram of a mode switching circuit according to some embodiments of the present invention;

11F is a schematic diagram of a mode switching circuit according to some embodiments of the present invention;

11G is a schematic diagram of a mode switching circuit according to some embodiments of the present invention;

11H is a schematic diagram of a mode switching circuit according to some embodiments of the present invention;

11I is a schematic diagram of a mode switching circuit according to some embodiments of the present invention;

12A is a block diagram of an exemplary power module for an LED lamp according to some embodiments of the present invention;

12B is a block diagram of an exemplary power module for an LED lamp according to some embodiments of the present invention;

12C is a configuration of a ballast compatible circuit according to an embodiment of the present invention;

12D is a block diagram of an exemplary power module for an LED lamp according to some embodiments of the present invention;

12E is a block diagram of an exemplary power module for an LED lamp according to some embodiments of the present invention;

12F is a schematic diagram of a ballast compatible circuit according to some embodiments of the present invention;

12G is a block diagram of an exemplary power module of an LED straight tube lamp according to some embodiments of the present invention;

12H is a schematic diagram of a ballast compatible circuit according to some embodiments of the present invention;

12I is a schematic diagram of a ballast compatible circuit according to some embodiments of the present invention;

13A is a block diagram of an exemplary power module of an LED straight tube lamp according to some embodiments of the present invention;

13B is a block diagram of an exemplary power module of an LED straight tube lamp according to some embodiments of the present invention;

13C is a block diagram of an exemplary power module of an LED straight tube lamp according to some embodiments of the present invention;

13D is a schematic diagram of a ballast compatible circuit according to some embodiments of the present invention, which may be applied to the embodiments shown in FIGS. 13A and 13B and the described variations thereof;

14A is a block diagram of an exemplary power module of an LED straight tube lamp according to some embodiments of the present invention;

14B is a schematic diagram of a filament simulation circuit according to some embodiments of the present invention;

14C is a block diagram of a filament simulation circuit according to some embodiments of the present invention;

14D is a schematic block diagram of a filament simulation circuit according to some embodiments of the present invention;

14E is a schematic diagram of a filament simulation circuit according to some embodiments of the present invention;

14F is a block diagram of a filament simulation circuit according to some embodiments of the present invention;

15A is a block diagram of an exemplary power module of an LED straight tube lamp according to some embodiments of the present invention;

15B is a schematic diagram of an overvoltage protection circuit according to an embodiment of the present invention;

16A is a block diagram of an exemplary power module of an LED straight tube lamp according to some embodiments of the present invention;

16B is a block diagram of an exemplary power module of an LED straight tube lamp according to some embodiments of the present invention;

16C is a block diagram of a ballast detection circuit according to some embodiments of the present invention;

16D is a schematic diagram of a ballast detection circuit according to some embodiments of the present invention;

16E is a schematic diagram of a ballast detection circuit according to some embodiments of the present invention;

17A is a block diagram of an exemplary power module for an LED straight tube lamp according to some embodiments of the present invention;

17B is a block diagram of an exemplary power module of an LED straight tube lamp according to some embodiments of the present invention;

17C is a schematic diagram of an auxiliary power module according to an embodiment of the present invention;

18 is a block diagram of an exemplary power module of an LED straight tube lamp according to some embodiments of the present invention.

Detailed ways

Exemplary embodiments of the present invention are described below with reference to the accompanying drawings, which include various details of the embodiments of the present invention to facilitate understanding and should be considered as exemplary only. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the invention. Also, descriptions of well-known functions and constructions are omitted from the following description for clarity and conciseness.

The present disclosure provides a new LED straight tube lamp. The present disclosure will be described in the following embodiments with reference to the accompanying drawings. The following description of various embodiments of the invention presented herein is for purposes of illustration and example only, and is not intended to be exclusive or limited to the precise form disclosed. These example embodiments are merely examples, and many implementations and variations are possible that do not require the details provided herein. It should also be emphasized that this disclosure provides details of alternative examples, but that these alternative listings are not exclusive. Moreover, the consistency of any detail between the various examples should be understood as requiring such detail, since it would not be practical to list every possible variation for every feature described herein. When determining the requirements of the present invention, reference should be made to the description in the claims.

In the drawings, the size and relative sizes of components may be exaggerated for clarity. Throughout the drawings, the same reference numbers refer to the same elements.

The technical terms used herein are only for describing specific embodiments, and are not intended to limit the present invention. As used herein, the singular forms "a (a)" or "an (an)" are intended to include the plural forms as well, unless the context clearly dictates otherwise. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items, and may be abbreviated as "/".

It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers or steps, these elements, components, regions, layers and/or steps should not be limited by These terms are restricted. These terms are only used to distinguish one element, component, region, layer or step from another element, component, region, layer or step, such as as a naming convention, unless context dictates otherwise. Thus, a first element, component, region, layer or step discussed below in one section of the specification could be named in another section of the specification or in the claims without departing from the teachings of the present invention is a second element, component, region, layer or step. In addition, in some cases, even if the description terms "first", "second" etc. are not used in the specification, the term may still be referred to as "first" or "second" in the claims to The different elements described are distinguished from each other.

It should also be understood that when the terms "comprising" or "comprising" are used in the specification, these terms enumerate the presence of the recited features, regions, integers, steps, operations, elements and/or components, but do not exclude one or The presence or addition of various other features, regions, integers, steps, operations, elements and/or components.

It will be understood that when an element is referred to as being "connected" or "coupled" to another element or element, it can be directly connected or coupled to the other element or element or may be present intermediate element. In contrast, when an element is referred to as being "directly connected" or "directly coupled" to another element, there are no intervening elements present. Other words used to describe the relationship between elements should be interpreted in a like fashion (eg, "between" versus "directly between," "adjacent" versus "directly adjacent," etc.). However, the term "contacting" as used herein refers to direct contact (ie, touching) unless the context dictates otherwise.

The embodiments described herein will be described with reference to plan and/or cross-sectional views by way of ideal schematic. Accordingly, the exemplary views may be modified depending on manufacturing techniques and/or tolerances. Accordingly, the disclosed embodiments are not limited to those shown in the drawings, but include variations in configurations formed on the basis of manufacturing processes. Accordingly, regions illustrated in the figures may have schematic properties and the shapes of regions illustrated in the figures may exemplify the shapes of regions of elements, but aspects of the present invention are not limited thereto.

Spatially relative terms, such as "under", "below", "under", "above", "over", etc. may be used herein to facilitate describing one element or feature shown in the figures to another element or characteristic relationship. It should be understood, however, that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the term "below" can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptions used herein should be interpreted accordingly.

Terms such as "same", "equal", "planar" or "coplanar" used herein with reference to orientation, layout, position, shape, size, number or other measure do not necessarily mean exactly the same orientation, layout, position, shape , size, number, or other measure, but is intended to encompass nearly the same orientation, layout, location, shape, size, number, or other measure within acceptable variation, eg, as may result from manufacturing processes. The term "substantially" may be used herein to reflect this meaning.

Terms such as "about" or "approximately" may reflect changes in size, orientation, or arrangement in only relatively small ways and/or in ways that do not significantly alter the operation, function, or structure of certain elements. For example, a range from "about 0.1 to about 1" can encompass, for example, a range of 0%-5% deviation around 0.1 and a range of 0% to 5% deviation around 1, especially if such deviations remain the same as the listed ranges influences.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure relates. It is also to be understood that terms, such as those defined in commonly used dictionaries, should be construed to have meanings consistent with their meanings in the relevant art and/or the context of this application, and should not be idealized or overly formalized meaning, unless expressly so defined herein.

As used herein, items described as "electrically connected" are configured such that electrical signals can be passed from one item to another. Thus, passive conductive members (eg, wires, wires, etc.) that are physically connected to passive insulating members (eg, a prepreg layer of a printed circuit board, two devices connected by an insulating adhesive, insulating underfill or mold layers, etc.). pads, internal electrical lines, etc.) are not electrically connected to this component. Furthermore, items that are "directly electrically connected" to each other are electrically connected by one or more passive elements, such as wires, pads, internal electrical lines, resistors, and the like. As such, direct electrical connection members do not include members that are electrically connected through active elements such as transistors or diodes.

The components described as being thermally connected or in thermal communication are arranged such that heat will follow a path between the components to allow heat to transfer from the first component to the second component. Just because two components are part of the same device or board does not make them thermally connected. Generally, components that are thermally conductive or directly connected to other thermally conductive or heat-generating components (or connected to these components through intervening thermally conductive components or so close as to allow substantial heat transfer) will be described as being thermally connected to, or thermally with, these components Connected. In contrast, two components with a thermally insulating material between them are not described as being thermally connected or in thermal communication with each other, wherein the material substantially prevents heat transfer between the two components, or only allows incidental heat transfer. The term "thermally conductive" does not apply to any material that provides incidental thermal conductivity, but is intended to refer to materials generally considered to be good conductors of heat or known to have uses for transferring heat, or to have similar thermal conductivity to these materials Components of performance.

Please refer to FIG. 1 and FIG. 2 , in one embodiment, the present invention provides an LED straight tube lamp, which includes: a lamp tube 1 , an LED lamp board 2 disposed in the lamp tube 1 , and an LED lamp board 2 disposed in the lamp tube 1 , respectively. Lamp caps 3 at both ends of tube 1. The lamp tube 1 can be a plastic lamp tube or a glass lamp tube, and the sizes of the lamp caps 3 at both ends are the same or different. Please continue to refer to FIG. 2 , in one embodiment, the LED light board 2 is provided with a plurality of LED light sources 202 , the lamp holder 3 is provided with a power supply 5 , and the LED light sources 202 and the power supply 5 are electrically connected through the LED light board 2 . The power supply 5 can be a single integrated unit (that is, all power supply components are integrated in a modular unit), and is provided in the lamp head 3 at one end of the lamp tube 1; or the power supply 5 can also be divided into two separate units (that is, all the power supply The member is divided into two parts), and two separate units are respectively provided in the lamp caps 3 at both ends of the lamp tube. If only one end of the lamp tube 1 is strengthened by glass tempering, the power source 5 is preferably selected as a single integrated unit, and is arranged in the lamp cap 3 corresponding to the strengthened end of the lamp tube 1 . The power module 250 is disposed on the above-mentioned power source 5 . Next, an example of circuit design and application of the power module 250 will be described.

3A is a schematic block diagram of a power module of an LED straight tube lamp according to an embodiment of the present invention. Referring to FIG. 3A , the AC power source 508 is used to provide the AC power signal, and the AC power source 508 can be commercial power, the voltage range is 100-277V, for example, and the frequency is 50 or 60Hz. The lamp driving circuit 505 receives the AC power signal from the AC power source 508 and converts it into an AC driving signal as an external driving signal. The lamp driving circuit 505 can be, for example, an electronic ballast, which is used to convert the signal of the mains into a high-frequency, high-voltage AC driving signal. Common types of electronic ballasts, such as: Instant Start electronic ballast, Program Start electronic ballast, Rapid Start electronic ballast, etc. The utility model The LED straight tube lights are applicable. The voltage of the AC driving signal is greater than 300V, and the preferred voltage range is about 400-700V. The frequency of the AC driving signal is greater than 10 kHz, and the preferred frequency range is about 20 k-50 kHz. The LED straight tube lamp 500 receives an external driving signal and is driven to emit light. In one embodiment, the external driving signal includes an AC driving signal from the lamp driving circuit 505 . In one embodiment, the LED straight tube lamp 500 is in the following driving environment, that is, the LED straight tube lamp 500 is powered at one end of the lamp cap, the lamp cap has two conductive pins 501, 502, the two conductive pins 501, 502 is coupled to the lamp driving circuit 505 to receive external driving signals. The two conductive pins 501 and 502 in this embodiment are electrically connected to the lamp driving circuit 505 either directly or indirectly.

It is worth noting that the lamp driving circuit 505 can be omitted, so it is marked with a dotted line in the figure. In one embodiment, when the lamp driving circuit 505 is omitted, the AC power supply 508 is directly connected to the pins 501 and 502. At this time, the pins 501 and 502 receive the AC power signal as an external driving signal.

In addition to the application of the above single-ended power supply, the LED straight tube lamp 500 of the present invention can also be applied to a double-ended power supply, so that each of the two ends of the LED lamp has a pin. Please refer to FIG. 3B , which is a schematic block diagram of a power module 250 of an LED straight tube lamp according to some embodiments of the present invention. Referring to FIG. 3B , compared with that shown in FIG. 3A , the pins 501 and 502 are respectively placed on the opposite double-ended lamp holders of the LED straight tube lamp 500 to form a single pin at each end of the LED straight tube lamp 500 , and the rest of the circuits are connected with The function is the same as the circuit shown in Figure 3A.

3C is a schematic block diagram of a circuit of an LED lamp according to an embodiment of the present invention. Referring to FIG. 3C , the power module of the LED lamp mainly includes a rectifier circuit 510 , a filter circuit 520 and an LED driving module 530 . The rectifier circuit 510 is coupled to the pin 501 and the pin 502 to receive an external driving signal, rectify the external driving signal, and then output the rectified signal from the output terminals 511 and 512 . The external driving signal here can be the AC driving signal or the AC power signal as shown in FIG. 3A and FIG. 3B , or even a DC signal without affecting the operation of the LED lamp of the present invention. The filter circuit 520 is coupled to the first rectifier circuit for filtering the rectified signal to generate the filtered signal, as described in the claims. For example, the filter circuit 520 is coupled to the output terminals 511 and 512 to receive the rectified signal, filter the rectified signal, and then output the filtered signal from the output terminals 521 and 522 . The LED driving module 530 is coupled to the filter circuit 520 to receive the filtered signal and emit light. For example, the LED driving module 530 is coupled to the output terminals 521 and 522 to receive the filtered signals, and then drives the LED units (not shown) in the LED driving module 530 to emit light. Please refer to the description of the following embodiments for details in this part.

It is worth noting that, in these drawings, the number of the output terminals 511, 512 and the output terminals 521, 522 is two, but in practical application, the rectifier circuit 510, the filter circuit 520 and the LED driving module 530 are used for coupling The number of ports or terminals can be one or more according to the needs of signal transmission between circuits or devices.

Furthermore, the power module of the LED lamp shown in FIG. 3C and the following embodiments of the power module of the LED lamp are not only applicable to the LED straight tube lamps shown in FIG. 3A and FIG. The light-emitting circuit structure that transmits power, such as: bulb lamps, PAL lamps, intubation energy-saving lamps (PLS lamps, PLD lamps, PLT lamps, PLL lamps, etc.) and other lamp holder specifications are applicable.

FIG. 3D is a block diagram of the power module 250 of the LED straight tube lamp according to the embodiment of the present invention. Referring to FIG. 3D, an AC power source 508 is used to provide an AC power signal. The lamp driving circuit 505 receives the AC power signal and converts it into an AC driving signal. The LED straight tube lamp 500 receives the AC driving signal from the lamp tube driving circuit 505 and is driven to emit light. In this embodiment, the LED straight tube lamp 500 is a double-ended (each double-pin) power supply, one end of the lamp holder has pins 501 and 502, and the other end of the lamp holder has pins 503 and 504. The pin 501 , the pin 502 , the pin 503 and the pin 504 are coupled to the lamp driving circuit 505 to jointly receive the AC driving signal to drive the LED unit (not shown) in the LED straight lamp 500 to emit light. The AC power source 508 can be commercial power, and the lamp driving circuit 505 can be a ballast or an electronic ballast.

3E is a block diagram of an LED lamp according to an embodiment of the present invention. Referring to FIG. 3E , the power module of the LED lamp mainly includes a rectifier circuit 510 , a filter circuit 520 , an LED driving module 530 and a rectifier circuit 540 . The rectifier circuit 510 is coupled to the pin 501 and the pin 502 for receiving and rectifying the external driving signal transmitted by the pin 501 and the pin 502; the rectifier circuit 540 is coupled to the pin 503 and the pin 504 for receiving and rectifying the external driving signal. The external driving signal transmitted by the pin 503 and the pin 504. That is to say, the power module of the LED lamp may include the rectifier circuit 510 and the rectifier circuit 540 to jointly output the rectified signal at the output ends 511 and 512 . The filter circuit 520 is coupled to the output terminals 511 and 512 to receive the rectified signal, filter the rectified signal, and then output the filtered signal from the output terminals 521 and 522 . The LED driving module 530 is coupled to the output terminals 521 and 522 to receive the filtered signals, and then drives the LED units (not shown) in the LED driving module 530 to emit light.

The power module of the LED lamp of the embodiment of FIG. 3E can be applied to the LED straight tube lamp 500 having the double-terminal power supply structure of FIG. 3D . It is worth noting that, since the power module of the LED lamp in this embodiment has both the rectifier circuit 510 and the rectifier circuit 540, the power module of the LED lamp can also be applied to the single-ended power supply structure shown in FIGS. 3A and B to receive external The driving signal (including the AC power signal, the AC driving signal, etc. in the foregoing embodiments). The power modules of the LED lamps of this embodiment and other embodiments herein can also be applied to DC signals.

4A is a schematic diagram of a rectifier circuit according to an embodiment of the present invention. Referring to FIG. 4A , the rectifier circuit 610 includes rectifier diodes 611 , 612 , 613 and 614 for full-wave rectification of the received signal. The anode of the rectifier diode 611 is coupled to the output terminal 512 , and the cathode is coupled to the pin 502 . The anode of the rectifier diode 612 is coupled to the output terminal 512 , and the cathode is coupled to the pin 501 . The anode of the rectifier diode 613 is coupled to the pin 502 , and the cathode is coupled to the output terminal 511 . The anode of the rectifier diode 614 is coupled to the pin 501 , and the cathode is coupled to the output terminal 511 .

When the signals received by the pins 501 and 502 are AC signals, the operation of the rectifier circuit 610 is described as follows. When the AC signal is in the positive half-wave, the AC signal flows in through the pin 501 , the rectifier diode 614 and the rectifier output terminal 511 in sequence, and flows out through the rectifier output terminal 512 , the rectifier diode 611 and the pin 502 in sequence. When the AC signal is in the negative half-wave, the AC signal flows in through the pin 502 , the rectifier diode 613 and the rectifier output terminal 511 in sequence, and flows out through the rectifier output terminal 512 , the rectifier diode 612 and the pin 501 in sequence. Therefore, regardless of whether the AC signal is in the positive half-wave or the negative half-wave, the positive pole of the rectified signal of the rectification circuit 610 is located at the rectification output end 511 , and the negative pole is located at the rectified output end 512 . According to the above operation description, the rectified signal output or generated by the rectification circuit 610 is a full-wave rectified signal.

When the pin 501 and the pin 502 are coupled to the DC power supply to receive the DC signal, the operation of the rectifier circuit 610 is described as follows. When the pin 501 is coupled to the anode of the DC power supply and the pin 502 is coupled to the cathode of the DC power supply, the DC signal flows through the pin 501, the rectifier diode 614 and the rectifier output terminal 511 in sequence, The rectifier output terminal 512 , the rectifier diode 611 and the pin 502 flow out in sequence. When the pin 501 is coupled to the negative terminal of the DC power supply and the pin 502 is coupled to the positive terminal of the DC power supply, the AC signal flows through the pin 502, the rectifier diode 613 and the rectifier output terminal 511 in sequence, and is rectified and output in sequence The terminal 512, the rectifier diode 612 and the pin 501 flow out. Likewise, no matter how the DC signal is input through the pins 501 and 502 , the positive pole of the rectified signal of the rectifier circuit 610 is located at the rectification output terminal 511 , and the negative pole is located at the rectified output terminal 512 .

Therefore, the rectifying circuit 610 in this embodiment can output or generate a rectified signal regardless of whether the received signal is an AC signal or a DC signal.

4B is a schematic diagram of a rectifier circuit according to an embodiment of the present invention. Referring to FIG. 4B , the rectifier circuit 710 includes a rectifier diode 711 and a rectifier diode 712 for performing half-wave rectification on the received signal. The positive terminal of the rectifier diode 711 is coupled to the pin 502 , and the negative terminal is coupled to the rectifier output terminal 511 . The positive terminal of the rectifier diode 712 is coupled to the rectification output terminal 511 , and the negative terminal is coupled to the pin 501 . The rectified output terminal 512 may be omitted or grounded according to practical applications.

Next, the operation of the rectifier circuit 710 will be described as follows.

In one embodiment, when the AC signal is in the positive half-wave, the signal level of the AC signal input at the pin 501 is higher than the signal level input at the pin 502 . At this time, both the rectifier diode 711 and the rectifier diode 712 are in a reverse-biased off state, and the rectifier circuit 710 stops outputting the rectified signal. When the AC signal is in the negative half-wave, the signal level of the AC signal input at the pin 501 is lower than the signal level input at the pin 502 . At this time, the rectifier diode 711 and the rectifier diode 712 are both in the forward-biased conduction state, and the AC signal flows in through the rectifier diode 711 and the rectifier output terminal 511, and is transmitted from the rectifier output terminal 512 or the other end or the ground terminal of the LED straight tube lamp. outflow. According to the above operation description, the rectified signal output or generated by the rectification circuit 710 is a half-wave rectified signal.

4C is a schematic diagram of a rectifier circuit according to an embodiment of the present invention. Referring to FIG. 4C , the rectifier circuit 810 includes a rectifier unit 815 and a terminal conversion circuit 541 . In this embodiment, the rectifying unit 815 is a half-wave rectifying circuit, including a rectifying diode 811 and a rectifying diode 812, for performing half-wave rectification. The positive terminal of the rectifier diode 811 is coupled to the rectification output terminal 512 , and the negative terminal is coupled to the half-wave connection point 819 . The positive terminal of the rectifier diode 812 is coupled to the half-wave connection point 819 , and the negative terminal is coupled to the rectifier output terminal 511 . The endpoint conversion circuit 541 is coupled to the half-wave connection point 819 , and the pins 501 and 502 for transmitting the signals received by the pins 501 and 502 to the half-wave connection point 819 . The rectifier circuit 810 can provide two input terminals (coupled to the pin 501 and the pin 502 ) and two output terminals 511 and 512 through the terminal conversion function of the terminal conversion circuit 541 .

Next, the operation of the rectifier circuit 810 in some embodiments is described as follows.

When the AC signal is in the positive half-wave, the AC signal flows through the pin 501 (or the pin 502), the terminal conversion circuit 541, the half-wave connection point 819, the rectifier diode 812 and the rectifier output terminal 511 in sequence, and is illuminated by the LED lights. from another circuit. When the AC signal is in the negative half-wave, the AC signal flows in from another circuit of the LED lamp, and then passes through the rectifier output terminal 512, the rectifier diode 811, the half-wave connection point 819, the terminal conversion circuit 541 and the pin 501 (or pin 501). 502) and then flow out.

It should be noted that the endpoint conversion circuit 541 may include resistors, capacitors, inductors, or a combination thereof, so as to simultaneously have functions such as current limiting/voltage limiting, protection, and current/voltage regulation. Please refer to the following description for the description of these functions.

In practice, the positions of the rectifier unit 815 and the terminal conversion circuit 541 can be exchanged (as shown in FIG. 4D ) without affecting the half-wave rectification function. 4D is a schematic diagram of a rectifier circuit according to an embodiment of the present invention. Referring to FIG. 4D , the positive end of the rectifier diode 811 is coupled to the pin 502 , and the negative end of the rectifier diode 812 is coupled to the pin 501 . The negative terminal of the rectifier diode 811 and the positive terminal of the rectifier diode 812 are simultaneously coupled to the half-wave connection point 819 . The terminal conversion circuit 541 is coupled to the half-wave connection point 819 , and the rectified output terminal 511 and the rectified output terminal 512 . When the AC signal is in the positive half-wave, the AC signal flows in from another circuit of the LED lamp, and then passes through the rectifier output terminal 512 (or the rectifier output terminal 511 ), the half-wave connection point 819 of the terminal conversion circuit 541 , the rectifier diode 812 , and After the pin 501 flows out. When the AC signal is in the negative half-wave, the AC signal flows through the pin 502, the rectifier diode 811, the half-wave connection point 819, the terminal conversion circuit 541, and the rectifier output terminal 511 (or the rectifier output terminal 512) in sequence, and is transmitted by the LED The other circuit or the other end of the lamp flows out.

It is worth noting that the endpoint conversion circuit 541 in the embodiments shown in FIG. 4C and FIG. 4D can be omitted, so it is represented by a dotted line. 4C omits the endpoint conversion circuit 541, the pin 501 and the pin 502 are coupled to the half-wave connection point 819. After the endpoint conversion circuit 541 is omitted in FIG. 4D , the rectified output terminal 511 and the rectified output terminal 512 are coupled to the half-wave connection point 819 .

The rectifier circuit 510 shown in FIGS. 4A to 4D can form or be used as the rectifier circuit 540 shown in FIG. 3E when the pins 501 and 502 are changed to the pins 503 and 504 for conduction.

Next, the selection and combination of the rectifier circuit 510 and the rectifier circuit 540 are described with reference to FIG. 3C and FIG. 3E .

The rectifier circuit 510 of the embodiment shown in FIG. 3C may use the rectifier circuit 610 shown in FIG. 4A .

The rectifier circuit 510 and the rectifier circuit 540 in the embodiment shown in FIG. 3E can use any of the rectifier circuits in FIGS. 4A to 4D , and the rectifier circuit shown in FIGS. 4C and 4D can also omit the end point conversion circuit 541 without affecting the The rectification function required for the operation of LED straight tube lamps. When the rectifier circuit 510 and the rectifier circuit 540 use the half-wave rectifier rectifier circuit shown in FIGS. 4B to 4D , as the AC signal is in the positive half-wave or the negative half-wave, the AC signal flows from one of the rectifier circuit 510 and the rectifier circuit 540 into , another outflow. Furthermore, if the rectifier circuit 510 and the rectifier circuit 540 use the rectifier circuit in FIG. 4C or FIG. 4D at the same time, or select the rectifier circuit in FIG. 4C and FIG. The conversion circuit 541 may have functions such as current limiting/voltage limiting, protection, and current/voltage adjustment, and the other terminal conversion circuit 541 may be omitted.

5A is a schematic diagram of an endpoint conversion circuit according to an embodiment of the present invention. Referring to FIG. 5A , the terminal conversion circuit 641 includes a capacitor 642, one end of the capacitor 642 is coupled to the pin 501 and the pin 502 at the same time, and the other end of the capacitor 642 is coupled to the half-wave connection point 819. The capacitor 642 has an equivalent impedance value to the AC signal. The lower the frequency of the AC signal, the larger the equivalent impedance value of the capacitor 642; the higher the frequency of the AC signal, the smaller the equivalent impedance value of the capacitor 642. Therefore, the capacitor 642 in the endpoint conversion circuit 641 of this embodiment has a high-pass filtering function. Furthermore, the terminal conversion circuit 641 is connected in series with the LED unit in the LED lamp, and has the function of current limiting/voltage limiting on the LED unit under the equivalent impedance, which can prevent the current and/or overvoltage of the LED unit from being too high Damage the LED unit. In addition, the current/voltage regulation can be further enhanced by selecting the capacitance of the capacitor 642 according to the frequency of the AC signal.

It should be noted that the endpoint conversion circuit 641 may additionally include a capacitor 645 and/or a capacitor 646 . One end of the capacitor 645 is coupled to the half-wave connection point 819 , and the other end is coupled to the pin 503 . One end of the capacitor 646 is coupled to the half-wave connection point 819 , and the other end is coupled to the pin 504 . For example, the capacitors 645 and 646 use the half-wave connection point 819 as a common connection terminal, and the capacitor 642 as a current adjustment capacitor is coupled to the common connection terminal and the pins 501 and 502. Under such a circuit structure, capacitors 642 and 645 are connected in series between one of the pins 501 and 502 and the pin 503 , or there are capacitors 642 and 645 connected in series between one of the pins 501 and 502 and the pin 504 . Capacitors 642 and 646. The AC signal is divided by the equivalent impedance value of the capacitors connected in series. 3E and 5A at the same time, according to the ratio of the equivalent impedance value of the capacitors connected in series, the cross-voltage of the capacitor 642 in the rectifier circuit 510 and the cross-voltage of the filter circuit 520 and the LED driving module 530 can be controlled, so that the LEDs flowing through the LEDs can be controlled. The current of the LED module of the driving module 530 is limited within a rated current value, and at the same time, the filter circuit 520 and the LED driving module 530 are protected/prevented from being damaged by excessive voltage.

5B is a schematic diagram of an endpoint conversion circuit according to an embodiment of the present invention. Referring to FIG. 5B , the terminal conversion circuit 741 includes capacitors 743 and 744 . One end of the capacitor 743 is coupled to the pin 501 , and the other end is coupled to the half-wave connection point 819 . One end of the capacitor 744 is coupled to the pin 502 , and the other end is coupled to the half-wave connection point 819 . Compared with the terminal conversion circuit 641 shown in FIG. 5A , the terminal conversion circuit 741 changes the capacitor 642 into two capacitors 743 and 744 . The capacitance values of the capacitors 743 and 744 may be the same, or may be different depending on the magnitude of the signal received by the pin 501 and the pin 502.

Likewise, the endpoint conversion circuit 741 may additionally include a capacitor 745 and/or a capacitor 746, which are coupled to the pin 503 and the pin 504, respectively. In this way, any of the pins 501 and 502 and any of the pins 503 and 504 have capacitors connected in series to achieve the function of voltage dividing and protection.

5C is a schematic diagram of an endpoint conversion circuit according to an embodiment of the present invention. Referring to FIG. 5C , the endpoint conversion circuit 841 includes capacitors 842 , 843 and 844 . The capacitors 842 and 843 are connected in series between the pin 501 and the half-wave connection point 819 . Capacitors 842 and 844 are connected in series between pin 502 and half-wave connection point 819 . Under such a circuit structure, any short circuit between the capacitors 842, 843 and 844 still exists between the pin 501 and the half-wave connection point 819 and between the pin 502 and the half-wave connection point 819 (the other two capacitors in) at least one capacitor while still limiting the current. Therefore, when the user accidentally touches the LED light and gets an electric shock, it can avoid the electric shock caused by the excessive current flowing through the human body.

Likewise, the endpoint conversion circuit 841 may additionally include a capacitor 845 and/or a capacitor 846, which are coupled to the pin 503 and the pin 504, respectively. In this way, any of the pins 501 and 502 and any of the pins 503 and 504 have capacitors connected in series to achieve the function of voltage dividing and protection.

FIG. 5D is a schematic diagram of an endpoint conversion circuit according to an embodiment of the present invention. Referring to FIG. 5D , terminal conversion circuit 941 includes fuses 947, 948. One end of the fuse 947 is coupled to the pin 501 , and the other end is coupled to the half-wave connection point 819 . One end of the fuse 948 is coupled to the pin 502 and the other end is coupled to the half-wave connection point 819 . Therefore, when the current flowing through any one of the pin 501 and the pin 502 is higher than the rated current of the fuses 947 and 948, the fuses 947 and 948 will correspondingly blow and open, thereby achieving the function of overcurrent protection.

When the positions of the pins 501 and 502 are interchanged with those of the pins 503 and 504 , each of the rectifier circuits 510 and 810 coupled to the pins 501 and 502 and the above-mentioned endpoint conversion circuits The embodiment can be transferred to the rectifier circuit 540 shown in FIG. 3E .

The capacitance value of the capacitor in the above-mentioned embodiment of the terminal conversion circuit is preferably between about 100pF-100nF. In addition, the capacitor can be equivalently replaced by two or more capacitors connected in parallel or in series. For example, the capacitors 642 and 842 can be replaced by two capacitors in series. The capacitance of one of the two capacitors can be selected from the range of about 1.0nF to about 2.5nF, preferably 1.5nF; the other is selected from the range of about 1.5nF to about 3.0nF, preferably about 2.2 nF.

6A is a block diagram of a filter circuit according to an embodiment of the present invention. Referring to FIG. 6A , the rectifier circuit 510 is drawn only to represent the connection relationship, and the filter circuit 520 does not include the rectifier circuit 510 . Referring to FIG. 6A , the filter circuit 520 includes a filter unit 523 , which is coupled to the rectification output terminal 511 and the rectification output terminal 512 to receive the rectified signal output by the rectification circuit, and to output the filtered signal after filtering the ripple in the rectified signal. . Therefore, the waveform of the filtered signal is smoother than that of the rectified signal. The filter circuit 520 may also include a filter unit 524, which is coupled between the rectifier circuit and the corresponding pins, for example: the rectifier circuit 510 and the pin 501, the rectifier circuit 510 and the pin 502, the rectifier circuit 540 and the pin 503 and the rectifier The circuit 540 and the pin 504 are used for filtering the specific frequency to filter out the specific frequency of the external driving signal. In the embodiment shown in FIG. 6A , the filter unit 524 is coupled between the pin 501 and the rectifier circuit 510. The filter circuit 520 may also include a filter unit 525 coupled between one of the pins 501 and 502 and the diode of the rectifier circuit 510 or between one of the pins 503 and 504 and the diode of the rectifier circuit 540 , to reduce or filter electromagnetic interference (EMI). In this embodiment, the filter unit 525 is coupled between the pin 501 and the diode (not shown in FIG. 6A ) of the rectifier circuit 510 . Since the filtering units 524 and 525 may be added or omitted depending on the actual application, they are represented by dotted lines in FIG. 6A .

6B is a schematic diagram of a filtering unit according to some embodiments of the present invention. Referring to FIG. 6B , the filter unit 623 includes a capacitor 625 . One end of the capacitor 625 is coupled to the rectifier output end 511 and the filter output end 521, and the other end is coupled to the rectifier output end 512 and the filter output end 522, so as to low-pass the rectified signal output by the rectifier output end 511 and the rectifier output end 512 Filtering to filter out high frequency components in the rectified signal to form a filtered signal, which is then output from the filtering output terminals 521 and 522 .

6C is a schematic diagram of a filtering unit according to an embodiment of the present invention. Referring to FIG. 6C , the filter unit 723 is a π-type filter circuit, including a capacitor 725 , an inductor 726 and a capacitor 727 . It is well known that a π-type filter circuit is similar in shape or structure to the symbol π. One end of the capacitor 725 is coupled to the rectifier output end 511 and is coupled to the filter output end 521 through the inductor 726 , and the other end is coupled to the rectifier output end 512 and the filter output end 522 . The inductor 726 is coupled between the rectifier output terminal 511 and the filter output terminal 521. One end of the capacitor 727 is coupled to the rectifier output end 511 and the filter output end 521 through the inductor 726 , and the other end is coupled to the rectifier output end 512 and the filter output end 522 .

As shown in FIG. 6C , between the rectification output end 511 and the rectification output end 512 and between the filter output end 521 and the filter output end 522, the filter unit 723 has more inductors 726 and capacitors 727 than the filter unit 623 shown in FIG. 6B . Also, like the capacitor 725, the inductor 726 and the capacitor 727 have low-pass filtering functions. Therefore, compared with the filtering unit 623 shown in FIG. 6B , the filtering unit 723 of this embodiment has better high-frequency filtering capability, and the waveform of the output filtered signal is smoother.

The inductance value of the inductor 726 in the above embodiment is preferably selected from the range of about 10 nH to about 10 mH. The capacitances of the capacitors 625 , 725 and 727 are preferably selected from the range of about 100pF to about 1uF.

6D is a schematic diagram of a filtering unit according to an embodiment of the present invention. Referring to FIG. 6D , the filtering unit 824 includes a capacitor 825 and an inductor 828 connected in parallel. One end of the capacitor 825 is coupled to the pin 501 , and the other end is coupled to the rectifier output end 511 for high-pass filtering the external driving signal input from the pin 501 to filter out low frequency components in the external driving signal. One end of the inductor 828 is coupled to the pin 501, and the other end is coupled to the rectifier output end 511 to perform low-pass filtering on the external driving signal input from the pin 501 to filter out high frequency components in the external driving signal. Therefore, the combination of the capacitor 825 and the inductor 828 can present a high impedance to a specific frequency in the external driving signal. That is, the parallel capacitor and inductor present a peak equivalent impedance to the external drive signal at a specific frequency.

By properly selecting the capacitance value of the capacitor 825 and the inductance value of the inductance 828, the center frequency f of the high-impedance frequency band can be located at a specific frequency, and the center frequency is Wherein L is the inductance value of the inductor 828 , and C is the capacitance value of the capacitor 825 . For example, a preferred center frequency is in the range of about 20-30 kHz, more preferably about 25 kHz. Also, for a specific center frequency, the LED lamp with the filter unit 824 can meet the UL listed safety requirements.

Notably, the filter unit 824 may include a resistor 829 . The resistor 829 is coupled between the pin 501 and the rectifier output terminal 511 . In Figure 6D, resistor 829 is connected in series with capacitor 825 and inductor 828 in parallel. For example, the resistor 829 is coupled between the pin 501 and the parallel capacitor 825 and the inductor 828 , or the resistor 829 is coupled between the rectifier output terminal 511 and the parallel capacitor 825 and the inductor 828 . In this embodiment, the resistor 829 is coupled between the pin 501 and the capacitor 825 and the inductor 828 connected in parallel. The resistor 829 is used to adjust the quality factor (Q value) of the LC circuit formed by the capacitor 825 and the inductor 828, so as to be more suitable for application environments with different Q value requirements. Since the resistor 829 is a non-essential component, it is represented by a dashed line in the embodiment shown in FIG. 6D .

The capacitance of the capacitor 825 is preferably in the range of about 10nF˜2uF. The inductance value of the inductor 828 is preferably less than 2mH, more preferably less than 1mH. The resistance of the resistor 829 is preferably greater than 50 ohms, more preferably greater than 500 ohms.

In addition to the filter circuits shown in the above embodiments, conventional low-pass or band-pass filters can be used in the filter circuit as the filter unit of the present invention.

6E is a schematic diagram of a filtering unit according to an embodiment of the present invention. Referring to FIG. 6E , in this embodiment, the filter unit 925 is disposed within the rectifier circuit 610 shown in FIG. 4A to reduce electromagnetic interference (EMI) caused by the rectifier circuit 610 and/or other circuits. In this embodiment, the filter unit 925 includes an EMI suppression capacitor, which is coupled between the pin 501 and the positive end of the rectifier diode 614 and is also coupled between the pin 502 and the positive end of the rectifier diode 613 to reduce the The electromagnetic interference accompanying the transmission of the positive half-wave of the AC drive signal received by the pin 501 and the pin 502. The EMI suppression capacitor of the filter unit 925 is also coupled between the negative end of the rectifier diode 612 and the pin 501 and is also coupled between the negative end of the rectifier diode 611 and the pin 502, so as to reduce the voltage of the pin 501 and the pin 502 Electromagnetic interference accompanying the transmission of the negative half-wave of the received AC drive signal. In some embodiments, the rectifier circuit 610 is a full-wave bridge rectifier circuit and includes rectifier diodes 611 , 612 , 613 and 614 . The full-wave bridge rectifier circuit has a first filter connection point and a second filter connection point, two rectifier diodes in the rectifier diodes 611, 612, 613 and 614—the rectifier diode 611 and the rectifier diode 613, wherein the positive end of the rectifier diode 613 and the negative end of the rectifier diode 611 is connected to form a first filter connection point, the other two rectifier diodes in the rectifier diodes 611, 612, 613 and 614 - the rectifier diodes 612 and 614, the positive end of the rectifier diode 614 and the rectifier diode 612. The negative terminal connection forms a second filter connection point. The EMI suppression capacitor of the filter unit 925 is coupled between the first filter connection point and the second filter connection point.

In addition, please refer to FIG. 4C and FIGS. 5A , 5B and 5C. Similarly, any capacitor in one of the circuits in FIGS. 5A , 5B and 5C is coupled to any one of the circuits in FIG. 4C Between the diode and the pin 501 and the pin 502 (or the pin 503 and the pin 504), any or all of the capacitors in FIG. 5A, FIG. 5B and FIG. 5C can be used as the EMI suppression capacitor of the filter unit to achieve The function of reducing the electromagnetic interference of the circuit. For example, the rectifier circuit 510 in FIG. 3C and FIG. 3E can be a half-wave rectifier circuit and includes two rectifier diodes, and the positive terminal of one of the two rectifier diodes is connected to the negative terminal of the other to form a half-wave connection point. Any or all of FIGS. 5B and 5C are capacitively coupled to the half-wave connection point of the two rectifier diodes and to at least one of the first pin and the second pin. Moreover, the rectifier circuit 540 in FIG. 3E can be a half-wave rectifier circuit and includes two rectifier diodes, and the positive terminal of one of the two rectifier diodes is connected to the negative terminal of the other to form a half-wave connection point. Any or all of the capacitors in FIG. 5C are coupled to the half-wave connection point of the two rectifier diodes and at least one of the third pin and the fourth pin.

It is worth noting that the EMI suppression capacitor in the embodiment shown in FIG. 6E can be used as the capacitor of the filter unit 824 to be matched with the inductor 828 of the filter unit 824 , and at the same time, it can achieve high impedance to external driving signals of a specific frequency and reduce electromagnetic interference. function. For example, when the rectifier circuit is a full-wave bridge rectifier circuit, the capacitor 825 of the filter unit 824 is coupled between the first filter connection point and the second filter connection point of the full-wave bridge rectifier circuit. When the rectifier circuit is a half-wave rectifier circuit, the capacitor 825 of the filter unit 824 is coupled to the half-wave connection point of the half-wave rectifier circuit and at least one of the first pin and the second pin.

7A is a schematic diagram of an LED module according to an embodiment of the present invention. Referring to FIG. 7A , the positive terminal of the LED module 630 is coupled to the filtering output terminal 521 , and the negative terminal is coupled to the filtering output terminal 522 . The LED module 630 includes at least one LED unit 632 . When there are two or more LED units 632, they are connected in parallel with each other. The positive terminal of each LED unit 623 is coupled to the positive terminal of the LED module 630 to be coupled to the filter output terminal 521 ; the negative terminal of each LED unit is coupled to the negative terminal of the LED module 630 to be coupled to the filter output terminal 522 . The LED unit 632 includes at least one LED 631 . When there are plural LEDs 631, the LEDs 631 are connected in series, the positive terminal of the first LED 631 is coupled to the positive terminal of the LED unit 632, and the negative terminal of the first LED 631 is coupled to the next or second LED 631 . The positive terminal of the last LED 631 is coupled to the negative terminal of the previous LED 631 , and the negative terminal of the last LED 631 is coupled to the negative terminal of the LED unit 632 .

It is worth noting that the LED module 630 can generate a current detection signal S531 , which represents the magnitude of the current flowing through the LED module 630 , for detecting and controlling the LED module 630 .

7B is a schematic diagram of an LED module according to an embodiment of the present invention. Referring to FIG. 7B , the positive terminal of the LED module 630 is coupled to the filtering output terminal 521 , and the negative terminal is coupled to the filtering output terminal 522 . The LED module 630 includes at least two LED units 732 , and the positive terminal of each LED unit 732 is coupled to the positive terminal of the LED module 630 , and the negative terminal is coupled to the negative terminal of the LED module 630 . Each LED unit 732 includes at least two LEDs 731, and the LEDs 731 in the LED unit 732 are connected in the same manner as described in FIG. 7A. For example, the cathode of LED 731 is coupled to the anode of the next LED 731, the anode of the first LED 731 is coupled to the anode of the LED unit 732, and the cathode of the last LED 731 is coupled to the cathode of the LED unit 732 . Furthermore, the LED units 732 in this embodiment are also connected to each other. The positive electrodes of the n-th LEDs 731 of each LED unit 732 are connected to each other, and the negative electrodes are also connected to each other. Therefore, the LEDs of the LED module 630 of the present embodiment are connected in a mesh form.

Compared with the embodiments of FIGS. 8A to 8G , the LED driving module 530 of the above-mentioned embodiment includes the LED module 630 but does not include the driving circuit of the LED module 630 .

Similarly, the LED module 630 of this embodiment can generate a current detection signal S531 , which represents the magnitude of the current flowing through the LED module 630 , and is used for detecting and controlling the LED module 630 .

In addition, in practical applications, the number of LEDs 731 included in the LED unit 732 is preferably 15-25, more preferably 18-22.

7C is a plan view of a circuit layout of an LED module according to some embodiments of the present invention. Referring to FIG. 7C , the connection relationship of the LEDs 831 in this embodiment is the same as that shown in FIG. 7B , and the three LED units in the LED module 630 are taken as an example for description here. The positive lead 834 and the negative lead 835 receive the driving signal to provide power to each LED 831 . For example, the positive lead 834 is coupled to the filter output end 521 of the filter circuit 520 , and the negative lead 835 is coupled to the filter output of the filter circuit 520 The terminal 522 is used to receive the filtered signal. For convenience of description, in FIG. 7C , the respective n-th LEDs 831 in all three LED units are divided into the same LED group 833 .

The positive lead 834 is connected to the (left) positive pole of the first LED 831 in the leftmost three LED units, ie, the (left) positive pole of the three first LEDs 831 in the leftmost LED group 833 as shown in FIG. 7C , and the negative lead 835 connects the three last LEDs 831 in the three LED units, ie the (right) negative poles of the three last LEDs 831 in the rightmost LED group 833 as shown in Figure 7C. The negative poles of the three first LEDs 831 of the three LED units, the positive poles of the three last LEDs 831 , and the positive poles and negative poles of the other LEDs 831 are connected by connecting wires or parts 839 .

In other words, the positive electrodes of the three LEDs 831 of the leftmost LED group 833 are connected to each other by the positive electrode wire 834 , and the negative electrodes thereof are connected to each other by the leftmost connection wire 839 . The anodes of the three LEDs 831 of the second left LED group 833 are connected to each other through the leftmost connecting wire 839 , and their cathodes are connected to each other through the second left connecting wire 839 . Since the cathodes of the three LEDs 831 of the leftmost LED group 833 and the anodes of the three LEDs 831 of the second left LED group 833 are connected to each other through the leftmost connecting wire 839 , the third LED of each of the three LED units The cathode of one LED 831 and the anode of the second LED 831 are connected to each other. And so on to form the network as shown in Figure 7B.

It is worth noting that the width 836 of the connecting wire 839 connected to the positive pole of the LED 831 is smaller than the width 837 of the part connected to the negative pole of the LED 831 . The area of the negative electrode connection portion is made larger than the area of the positive electrode connection portion. In addition, the width 837 is smaller than the width 838 of the portion of the connecting wire 839 that simultaneously connects the positive electrode of one of the two LEDs 831 and the negative electrode of the other, so that the area of the portion connected to the positive electrode and the negative electrode at the same time is larger than that of the portion connected to the negative electrode only. area and the area of the positive connection part. Therefore, such a wiring structure helps to dissipate heat from the LED 831 .

In some embodiments, the positive lead 834 may further include a positive lead 834a, and the negative lead 835 may further include a negative lead 835a, so that both ends of the LED module have positive "+" and negative "-" connection points, as shown in the figure shown in 7C. Such a wiring structure enables other circuits of the power module of the LED lamp, such as the filter circuit 520, the rectifier circuit 510 and the rectifier circuit 540, to be coupled to the positive and/or negative connection points of either or both ends of the LED lamp. The LED module, thereby increasing the flexibility of the configuration arrangement of the actual circuit in the LED lamp.

7D is a plan view of a circuit layout of an LED module according to another embodiment of the present invention. Referring to FIG. 7D , the connection relationship of the LEDs 931 in this embodiment is the same as that shown in FIG. 7A . Here, three LED units and each LED unit includes seven LEDs 931 are used as an example for description. The positive lead 934 and the negative lead 935 receive driving signals to provide power to each LED 931 . For example, the positive lead 934 is coupled to the filter output end 521 of the filter circuit 520 , and the negative lead 935 is coupled to the filter output of the filter circuit 520 The terminal 522 is used to receive the filtered signal. For convenience of description, the seven LEDs 931 of each of the three LED units are divided into the same LED group 932 in FIG. 7D . There are therefore three LED groups 932 corresponding to the three LED units.

The positive lead 934 connects the (left) positive pole of the first (leftmost) LED 931 in each of the three LED groups 932. Negative lead 935 connects the (right) negative of the last (rightmost) LED 931 in each of the three LED groups 932. In each LED group 932, the negative pole of the left LED 931 adjacent to the two LEDs 931 is connected to the positive pole of the right LED 931 through a connecting wire 939. Thereby, the LEDs 931 of each LED group 932 are connected in series.

It is worth noting that the connecting wire 939 is used to connect the negative electrode of one of the two adjacent LEDs 931 and the positive electrode of the other. The negative lead 935 is used to connect the negative pole of the last (rightmost) LED 931 of each LED group 932 . The positive lead 934 is used to connect the positive pole of the first (leftmost) LED 931 of each LED group 932. Therefore, as shown in FIG. 7D , the width (area) of the connecting wire 939 is larger than the portion where the negative wire 935 is connected to the negative electrode, and the width (area) of the portion where the negative wire 935 is connected to the negative electrode is larger than the portion where the positive wire 934 is connected to the positive electrode. For example, the width 938 of the connecting wire 939 may be greater than the width 937 of the portion where the negative wire 935 connects to the negative terminal of the LED 931 and the width 937 is greater than the width 936 of the portion where the positive wire 934 connects to the positive terminal of the LED 931 . Therefore, such a wiring structure facilitates heat dissipation of the LEDs 931 of the LED module 630 .

In addition, the positive lead 934 can also include a positive lead 934a, and the negative lead 935 can also include a negative lead 935a, so that both ends of the LED module have positive "+" and negative "-" connection points, as shown in FIG. 7D. Such a wiring structure enables other circuits of the power module of the LED lamp, such as the filter circuit 520, the rectifier circuit 510 and the rectifier circuit 540, to be connected by the positive connection point 934a and/or the negative connection point at either or both ends of the LED lamp. 935a is coupled to the LED module. Therefore, the layout structure increases the flexibility of the configuration arrangement of the actual circuit in the LED lamp.

Furthermore, the traces shown in Figures 7C and 7D may be implemented using a flexible circuit board or substrate, which may even be referred to as a flexible circuit board, depending on the specific definition used. For example, the flexible circuit board has a single conductive layer, and the positive lead 834, the positive lead 834a, the negative lead 835, the negative lead 835a and the connection lead 839 in FIG. 7C are formed by etching, and the positive lead in FIG. 7D is formed 934 , the positive lead 934a, the negative lead 935, the negative lead 935a, and the connecting lead 939.

7E is a plan view of a circuit layout of an LED module according to some embodiments of the present invention. The layout structures of the LED modules in FIGS. 7E and 7C each correspond to the same manner as for connecting the LEDs 831 as shown in FIG. 7B , but the layout structure in FIG. 7E includes two layers of conductive layers instead of only one conductive layer for The circuit layout shown in FIG. 7C is formed. 7E, the main difference from the layout in FIG. 7C is that the positive lead 834 and the negative lead 835 have positive lead 834a and negative lead 835a, respectively, which are formed in the second conductive layer. The difference is explained below.

Referring to FIG. 7E , the flexible circuit board of the LED module has two layers of conductive layers, including a first conductive layer 2a, a dielectric layer 2b and a second conductive layer 2c. The first conductive layer 2a and the second conductive layer 2c are electrically isolated by a dielectric layer 2b. The positive lead 834, the negative lead 835 and the connection lead 839 in FIG. 7E are formed by etching in the first conductive layer 2a of the flexible circuit board, for example, to electrically connect the plurality of LED members 831 in a mesh form, In the second conductive layer 2c, a positive electrode lead 834a and a negative electrode lead 835a are formed by etching, which are used to electrically connect (the filter output end of) the filter circuit. Furthermore, the positive lead 834 and the negative lead 835 of the first conductive layer 2a of the flexible circuit board have layer connection points 834b and 835b for connecting to the second conductive layer 2c. The positive electrode lead 834a and the negative electrode lead 835a of the second conductive layer 2c have layer connection points 834c and 835c. Layer connection point 834b is located opposite layer connection point 834c for connecting positive lead 834 and positive lead 834a. The layer connection point 835b and the layer connection point 835c are located opposite to each other, and are connected to the negative electrode lead 835 and the negative electrode lead 835a. The preferred way to connect the two conductive layers is to form holes that connect each layer connection point 834b to the corresponding layer connection point 834c, and to form holes that connect each layer connection point 835b to the corresponding layer connection point 835c connection, the holes extend through the two conductive layers and the dielectric layer in between. Also, the positive electrode lead 834 and the positive electrode lead 834a can be electrically connected by the welded metal member passing through the connection hole, and the negative electrode lead 835 and the negative electrode lead 835a can be electrically connected by the welded metal member passed through the connection hole.

Similarly, the wiring of the LED module shown in FIG. 7D can also be changed from the positive lead 934a and the negative lead 935a to the second conductive layer to form a double-layer wiring structure.

It is worth noting that, the thickness of the second conductive layer of the double-layer flexible circuit board is preferably thicker than that of the first conductive layer, so that the positive lead and the negative electrode disposed in the second conductive layer can be reduced. Line loss (voltage drop) on the leads. Furthermore, compared with the single-layer flexible circuit board, the double-layer flexible circuit board can reduce the size of the double-layer flexible circuit board by moving the positive and negative leads at both ends to the second conductive layer in the double-layer flexible circuit board. The width of the flexible circuit board (the width between the two longitudinal sides). A narrower flexible circuit board has a greater maximum discharge number than a wider flexible circuit board on the same fixture or board during production. Therefore, using a narrower flexible circuit board can improve the production efficiency of the LED module. Moreover, the flexible circuit board with the double-layer conductive layer is relatively easy to maintain the shape, so as to increase the reliability of production, for example, the accuracy of the welding position when the LED components are welded.

As a modification of the above solution, the present invention also provides an LED straight tube lamp, wherein at least part of the electronic components of the power module of the LED straight tube lamp are arranged on the LED lamp board. For example, at least part of the electronic components are printed, inserted or embedded on the light board using PEC (Printed Electronic Circuits, PEC: Printed Electronic Circuits) technology.

In one embodiment of the present invention, all the electronic components of the power module are arranged on the LED light board. The production process is as follows: substrate preparation (flexible printed circuit board preparation) → printing metal nano-ink → printing passive components/active devices (power modules) → drying/sintering → printing interlayer connection bumps →Spray insulating ink →Spray metal nano ink →Spray passive components and active devices (and so on to form the included multi-layer board) →Spray surface welding pad →Spray solder resist to weld LED components.

In some embodiments, if all the electronic components of the power module are arranged on the LED light board, it is only necessary to connect the pins of the LED straight tube lamp by welding wires at both ends of the light board, so as to realize the connection of the LED straight tube light. The electrical connection between the pins and the light board. In this way, it is no longer necessary to provide a substrate for the power module, thereby further optimizing the design or arrangement of the lamp head of the LED straight tube lamp. In some embodiments, the power modules are arranged at both ends of the light panel, so as to minimize the influence of the heat generated by its operation on the LED components. In this embodiment, since there is no substrate other than the lamp board for supporting the power module, the total amount of welding can be significantly reduced, and the overall reliability of the power module can be improved.

Another situation is that when some electronic components (such as resistors and/or small-sized capacitors) of the power module are printed on the LED light board, large components such as inductors and/or electrolytic capacitors are placed on the LED light board. inside the lamp head. The production process of the LED light board is the same as above. And in this case, the design of the lamp cap is optimized by arranging some electronic components on the lamp board, and rationally arranging the power modules in the LED straight tube lamp.

As a modification of the above solution, the electronic components of the power module can also be arranged on the lamp board by means of embedding or inserting. That is, the electronic components are embedded in the flexible or flexible lamp board in an embedded manner. In some embodiments, methods such as copper clad laminates (CCL) containing resistance/capacitance or screen printing related inks can be used; or the method of embedding passive components by using inkjet printing technology The ink printer directly prints the conductive ink and related functional ink as passive components to the set position in the lamp board. Then, through UV light treatment or drying/sintering treatment, a lamp panel with embedded passive components is formed. Electronic components embedded in the light panel include, for example, resistors, capacitors, and inductors; in other embodiments, active components are also suitable. By embedding some components into the lamp board, a reasonable layout of the power module can be achieved and the design of the lamp head can be optimized. Since the surface area of the components of the printed circuit board used to carry the power module is reduced or reduced, the result is used for The size, weight and thickness of the printed circuit board carrying the components of the power module are also reduced or reduced. Also in this case, the reliability of the power module is also improved by eliminating the solder joints of these resistors and capacitors (the solder joints are the parts of the printed circuit board that are most likely to introduce or cause failures, failures or defects). At the same time, the length of the wires used to connect the components on the printed circuit board will be shortened and allow a more compact layout of components on the printed circuit board, thus improving the performance of these components.

In an embodiment of the present invention, the wires are directly printed on the inner wall of the LED glass tube in a linear layout, and the LED components are directly attached to the inner wall to be electrically connected to each other through the wires. In some embodiments, the LED component in the form of a chip is directly attached to the wire on the inner wall, connection points are provided at both ends of the wire, and the LED component is connected to the power module through the connection points. After attaching, phosphor powder is coated or dripped on the chip, so that the LED straight tube lamp can generate white light or light of other colors when it works.

In some embodiments, the luminous efficiency of the LED or LED component is above 80lm/W, and in some embodiments, the luminous efficiency may preferably be above 120lm/W. Certain more preferred embodiments may include LEDs or LED components with a luminous efficacy of 160 lm/W or more. The white light emitted by the LED component can be generated by mixing the monochromatic light emitted by the monochromatic LED chip through the phosphor powder. The main wavelengths of the spectrum of white light are 430-460 nm and 550-560 nm, or 430-460 nm, 540-560 nm and 620-640 nm.

8A is a block diagram of a power module of an LED lamp according to an embodiment of the present invention. Referring to FIG. 8A , the power module of the LED lamp in this embodiment includes a rectifier circuit 510 and a rectifier circuit 540 , a filter circuit 520 , and an LED driving module 530 , and the LED driving module 530 in this embodiment further includes a driving circuit 1530 and an LED module 630. As shown in FIG. 3E , the driving circuit 1530 in FIG. 8A is a DC-to-DC conversion circuit, which is coupled to the filter output terminals 521 and 522 to receive the filtered signal and perform power conversion to convert the filtered signal into a driving signal by driving Output terminals 1521 and 1522 output. The LED module 630 is coupled to the driving output terminals 1521 and 1522 to receive the driving signal and emit light. In some embodiments, the current of the LED module 630 is stabilized at a predetermined current value. The description of the LED module 630 is the same as that provided with reference to Figures 7A-7D.

It is worth noting that the rectifier circuit 540 is an unnecessary component and can be omitted, so it is represented by a dotted line in the figure. That is, the LED driving module 530 in the embodiments of FIGS. 8A , 8C and 8E may include the driving circuit 1530 and the LED module 630 . Therefore, the power supply module of the LED lamp of this embodiment can also be applied to a single-ended power supply connected to one end of the LED lamp, and can be applied to a double-ended power supply coupled to both ends of the LED lamp. In the case of a single-ended power supply, the LED lamps are, for example, LED bulb lamps, PAL lamps, and the like.

8B is a block diagram of a driving circuit according to an embodiment of the present invention. Referring to FIG. 8B , the driving circuit includes a controller 1531 and a conversion circuit 1532 , and performs power conversion in a current source mode to drive the LED module to emit light. The conversion circuit 1532 includes a switch circuit 1535 and a tank circuit 1538 . The conversion circuit 1532 is coupled to the filter output terminals 521 and 522, receives the filtered signal, and according to the control of the controller 1531, converts the filtered signal into a driving signal and outputs it through the driving output terminals 1521 and 1522 to drive the LED module. Under the control of the controller 1531, the driving signal output by the conversion circuit 1532 is a stable current, so that the LED module can emit light stably.

8C is a schematic diagram of a driving circuit according to an embodiment of the present invention. 8C , in this embodiment, the driving circuit 1630 is a step-down DC-to-DC conversion circuit, including a controller 1631 and a conversion circuit, and the conversion circuit includes an inductor 1632, a freewheeling diode 1633, a capacitor 1634, and a switch 1635. The driving circuit 1630 is coupled to the filtering output terminals 521 and 522 to convert the received filtered signal into a driving signal for driving the LED module coupled between the driving output terminals 1521 and 1522 .

In this embodiment, the switch 1635 is a metal-oxide-semiconductor field-effect transistor (MOSFET), and has a control terminal, a first terminal and a second terminal. The first end of the switch 1635 is coupled to the positive electrode of the freewheeling diode 1633 , the second end is coupled to the filter output end 522 , and the control end is coupled to the controller 1631 to make the first end and the second end of the switch 1635 conduct or deadline. The drive output end 1521 is coupled to the filter output end 521 , the drive output end 1522 is coupled to one end of the inductor 1632 , and the other end of the inductor 1632 is coupled to the first end of the switch 1635 . The capacitor 1634 is coupled between the driving output terminals 1521 and 1522 to stabilize the voltage difference between the driving output terminals 1521 and 1522 . The negative terminal of the freewheeling diode 1633 is coupled to the driving output terminal 1521 .

Next, the operation of the driving circuit 1630 will be described.

The controller 1631 determines the on and off times of the switch 1635 according to the current detection signal S535 and/or the current detection signal S531. For example, in some embodiments, the controller 1631 is configured to control the duty cycle (Duty Cycle) during which the switch 1635 is turned on and the switch 1635 is turned off to adjust the magnitude or amplitude of the driving signal. The current detection signal S535 represents the magnitude of the current flowing through the switch 1635 . The current detection signal S531 represents the magnitude of the current flowing through the LED module coupled between the driving output terminals 1521 and 1522 . According to any one of the current detection signals S531 and S535, the controller 1631 can obtain information on the magnitude of the power converted by the conversion circuit. When the switch 1635 is turned on, the current of the filtered signal flows in from the filter output terminal 521 , and flows out from the filter output terminal 522 through the capacitor 1634 and the drive output terminal 1521 to the LED module, the inductor 1632 , and the switch 1635 . At this time, the capacitor 1634 and the inductor 1632 store energy. On the other hand, when the switch 1635 is turned off, the inductor 1632 and the capacitor 1634 release the stored energy, and the current flows through the freewheeling diode 1633 to the driving output end 1521 so that the LED module continues to emit light.

It is worth noting that the capacitor 1634 is not an essential component and can be omitted, so it is represented by a dotted line in the figure. In some application environments, the capacitor 1634 can be omitted by omitting the capacitor 1634 by stabilizing the current of the LED module due to the characteristic of the inductor resisting the change of the current.

8D is a schematic diagram of a driving circuit according to an embodiment of the present invention. Referring to FIG. 8D , in this embodiment, the driving circuit 1730 is a boost DC to DC conversion circuit, including a controller 1731 and a conversion circuit, and the conversion circuit includes an inductor 1732, a freewheeling diode 1733, a capacitor 1734, and a switch 1735. The driving circuit 1730 converts the filtered signals received from the filtering output terminals 521 and 522 into driving signals for driving the LED modules coupled between the driving output terminals 1521 and 1522 .

One end of the inductor 1732 is coupled to the filter output end 521 , and the other end is coupled to the anode of the freewheeling diode 1733 and the first end of the switch 1735 . The second terminal of the switch 1735 is coupled to the filtering output terminal 522 and the driving output terminal 1522 . The cathode of the freewheeling diode 1733 is coupled to the driving output terminal 1521 . The capacitor 1734 is coupled between the driving output terminals 1521 and 1522 .

The controller 1731 is coupled to the control terminal of the switch 1735, and controls the on and off of the switch 1735 according to the current detection signal S531 and/or the current detection signal S535. When the switch 1735 is turned on, the current of the filtered signal flows into the filter output terminal 521 , flows through the inductor 1732 and the switch 1735 and flows out from the filter output terminal 522 . At this time, the current flowing through the inductor 1732 increases with time, and the inductor 1732 is in an energy storage state. At the same time, the capacitor 1734 is in a state of releasing energy to continuously drive the LED module to emit light. On the other hand, when the switch 1735 is turned off, the inductor 1732 is in a state of releasing energy, and the current of the inductor 1732 decreases with time. In this state, the current of the inductor 1732 freewheels to the capacitor 1734 and the LED module through the freewheeling diode 1733 . At this time, the capacitor 1734 is in an energy storage state.

It is worth noting that capacitor 1734 is an optional component, so it can be omitted and is therefore shown in phantom in Figure 8D. When the capacitor 1734 is omitted, when the switch 1735 is turned on, the current of the inductor 1732 does not flow through the LED module and the LED module does not emit light; when the switch 1735 is turned off, the current of the inductor 1732 flows through the LED module through the freewheeling diode 1733 and Make the LED module glow. By controlling the lighting time of the LED module and the magnitude of the current flowing through the LED module, the average brightness of the LED module can be stabilized at the set value, so as to achieve the same stable lighting effect.

8E is a schematic diagram of a driving circuit according to an embodiment of the present invention. 8E, in this embodiment, the driving circuit 1830 is a step-down DC-to-DC conversion circuit, including a controller 1831 and a conversion circuit, and the conversion circuit includes an inductor 1832, a freewheeling diode 1833, a capacitor 1834, and a switch 1835. The driving circuit 1830 is coupled to the filtering output terminals 521 and 522 to convert the received filtered signal into a driving signal for driving the LED module coupled between the driving output terminals 1521 and 1522 .

The first terminal of the switch 1835 is coupled to the filter output terminal 521 , the second terminal is coupled to the negative electrode of the freewheeling diode 1833 , and the control terminal is coupled to the controller 1831 to receive the control signal of the controller 1831 to make the first terminal of the switch 1835 The state between the second terminal and the second terminal is on or off. The anode of the freewheeling diode 1833 is coupled to the filter output terminal 522 and drives the filter output terminal 522 . One end of the inductor 1832 is coupled to the second end of the switch 1835 , and the other end is coupled to the driving output end 1521 . The capacitor 1834 is coupled between the driving output terminals 1521 and 1522 to stabilize the voltage between the driving output terminals 1521 and 1522 .

The controller 1831 controls the on and off of the switch 1835 according to the current detection signal S531 and/or the current detection signal S535. When the switch 1835 is turned on, the current flows into the filter output terminal 521, flows through the switch switch 1835, the inductor 1832, the drive output terminals 1521 and 1522, and then flows out from the filter output terminal 522. At this time, the current flowing through the inductor 1832 and the voltage of the capacitor 1834 increase with time, and the inductor 1832 and the capacitor 1834 are in an energy storage state. On the other hand, when the switch 1835 is turned off, the inductor 1832 is in a state of releasing energy, and the current of the inductor 1832 decreases with time. At this time, the current of the inductor 1832 returns to the inductor 1832 through the drive output terminals 1521 and 1522 and the freewheeling diode 1833 to form a freewheeling current.

Notably, capacitor 1834 is an optional component, so it can be omitted and shown in phantom in Figure 8E. When the capacitor 1834 is omitted, regardless of whether the switch 1835 is turned on or off, the current of the inductor 1832 can flow through the driving output terminals 1521 and 1522 to drive the LED module to continuously emit light.

8F is a schematic diagram of a driving circuit according to an embodiment of the present invention. 8F , in this embodiment, the driving circuit 1930 is a step-down DC-to-DC conversion circuit, including a controller 1931 and a conversion circuit, and the conversion circuit includes an inductor 1932 , a freewheeling diode 1933 , a capacitor 1934 and a switch 1935 . The driving circuit 1930 is coupled to the filtering output terminals 521 and 522 to convert the received filtered signal into a driving signal for driving the LED module coupled between the driving output terminals 1521 and 1522 .

One end of the inductor 1932 is coupled to the filter output end 521 and the driving output end 1522 , and the other end is coupled to the first end of the switch 1935 . The second terminal of the switch 1935 is coupled to the filter output terminal 522 , and the control terminal is coupled to the controller 1931 to receive a control signal from the controller 1931 for controlling the switch 1935 to be turned on or off. The positive electrode of the freewheeling diode 1933 is coupled to the connection point between the inductor 1932 and the switch 1935 , and the negative electrode is coupled to the driving output terminal 1521 . The capacitor 1934 is coupled to the driving output terminals 1521 and 1522 to stabilize the driving of the LED module coupled between the driving output terminals 1521 and 1522.

The controller 1931 controls the on and off of the switch 1935 according to the current detection signal S531 and/or the current detection signal S535. When the switch 1935 is turned on, the current flows into the filter output terminal 521 , flows through the inductor 1932 , and then flows out from the filter output terminal 522 after the switch 1935 . At this time, the current flowing through the inductor 1932 increases with time, and the inductor 1932 is in a state of energy storage; but the voltage of the capacitor 1934 decreases with time, so the capacitor 1934 is in a state of releasing energy to keep the LED module emitting light. On the other hand, when the switch 1935 is turned off, the inductor 1932 is in a state of releasing energy, and the current of the inductor 1932 decreases with time. At this time, the current of the inductor 1932 returns to the inductor 1932 through the freewheeling diode 1933, the drive output terminals 1521 and 1522, and forms a freewheeling current. At this time, the capacitor 1934 is in an energy storage state, and the voltage of the capacitor 1934 increases with time.

Notably, capacitor 1934 is an optional component, so it can be omitted and is therefore shown in phantom in Figure 8F. When the capacitor 1934 is omitted and the switch 1935 is turned on, the current of the inductor 1932 does not flow through the driving output terminals 1521 and 1522 so that the LED module does not emit light. On the other hand, when the switch 1935 is turned off, the current of the inductor 1932 flows through the freewheeling diode 1933 and flows through the LED module to cause the LED module to emit light. By controlling the lighting time of the LED module and the magnitude of the current flowing through the LED module, the average brightness of the LED module can be stabilized at the set value, so as to achieve the same stable lighting effect.

8G is a block diagram of a driving circuit according to an embodiment of the present invention. Referring to FIG. 8G , the driving circuit includes a controller 2631 and a conversion circuit 2632 to perform power conversion based on an adjustable current source to drive the LED module to emit light. The conversion circuit 2632 includes a switch circuit 2635 and a tank circuit 2638 . The conversion circuit 2632 is coupled to the filter output terminals 521 and 522, receives the filtered signal, and according to the control of the controller 2631, converts the filtered signal into a driving signal which is output from the driving output terminals 1521 and 1522 to drive the LED module. The controller 2631 receives the current detection signal S535 and/or the current detection signal S539, and controls the driving signal output by the conversion circuit 2632 to be stable at the set current value. The current detection signal S535 represents the current of the switch circuit 2635; the current detection signal S539 represents the current of the tank circuit 2638, such as the inductor current in the tank circuit 2638, the current output by the driving output terminal 1521, etc. Either of the current detection signals S535 and S539 can represent the magnitude of the current Iout provided by the driving circuit to the LED module through the driving output terminals 1521 and 1522 . The controller 2631 is further coupled to the filter output terminal 521 to determine the set current value according to the voltage Vin of the filter output terminal 521 . Therefore, the current Iout of the driving circuit, that is, the set current value, is adjusted according to the magnitude of the voltage Vin of the filtered signal output by the filter circuit.

It should be noted that the generation of the current detection signals S535 and S539 can be measured by means of resistance or inductance. For example, the voltage difference between the two ends of the resistance generated by the current flowing through the resistance in the conversion circuit 2632, or the voltage difference generated by the mutual inductance between the inductance in the conversion circuit 2632 and the inductance in the tank circuit 2638 can be detected. measure current.

The above driving circuit structure is especially suitable for the application environment where the external driving circuit of the LED straight lamp is an electronic ballast. The electronic ballast is equivalent to a current source, and its output power is not a fixed value. However, as shown in FIGS. 8C to 8F , the power consumption of the internal driving circuit is related to the number of LEDs in the LED module, which can be regarded as a fixed value. When the output power of the electronic ballast is higher than the power consumption of the LED module driven by the driving circuit, the output voltage of the electronic ballast will continue to increase, so that the level of the AC driving signal received by the power module of the LED lamp will be higher. There is a risk of damage to components that exceed the withstand voltage of the electronic ballast and/or the power module of the LED lamp due to the continuous rise. On the other hand, when the output power of the electronic ballast is lower than the power consumption of the LED module driven by the driving circuit, the output voltage of the electronic ballast will continue to decrease, that is, the level of the AC drive signal will continue to decrease, resulting in The LED straight tube light does not operate properly.

It is worth noting that the power required for LED lighting is already less than that required for fluorescent lighting such as fluorescent lamps. For example, if the control mechanism for controlling LED brightness, such as the previous backlight module, is used in traditional driving systems such as electronic ballasts, it will inevitably encounter mismatch or incompatibility caused by the difference between the power of the external driving system and the required power of the LED lamp. question. Even problems that lead to damage to the drive system and/or LED lights. In order to prevent this problem, the LED (straight tube) lamp is made more compatible with the conventional fluorescent lamp lighting system by using, for example, the above-mentioned power/current adjustment method in FIG. 8G.

8H is a schematic diagram of the relationship between the voltage Vin and the set current value Iout according to an embodiment of the present invention. In FIG. 8H , the horizontal axis represents the voltage Vin, and the vertical axis represents the current Iout. In some cases, when the voltage Vin (ie, the level) of the filtered signal is between the voltage upper limit value VH and the voltage lower limit value VL, the set current value Iout is maintained at the original set current value. The voltage upper limit value VH is higher than the voltage lower limit value VL. When the voltage Vin of the filtered signal is higher than the upper voltage limit VH, the set current value Iout increases with the increase of the voltage Vin. In this stage, it is preferable that the slope of the curve becomes larger as the voltage Vin increases. When the voltage Vin of the filtered signal is lower than the lower voltage limit VL, the set current value decreases as the voltage Vin decreases. In this stage, it is preferable that the slope of the curve becomes smaller as the voltage Vin decreases. That is, when the voltage Vin is higher than the voltage upper limit value VH or lower than the voltage lower limit value VL, the set current value Iout is preferably a function relationship of the quadratic or more of the voltage Vin, so that the increase rate of the power consumption can be achieved. (decrease rate) is higher than the increase rate (decrease rate) of the output power of the external drive system. That is, in some embodiments, the adjustment function of the set current value is a quadratic or more function of the filtered voltage Vin.

In another embodiment, when the voltage Vin of the filtered signal is between the voltage upper limit value VH and the voltage lower limit value VL, the set current value Iout of the LED lamp will linearly increase or decrease as the voltage Vin increases or decreases . At this stage, when the voltage Vin is at the upper voltage limit VH, the set current value Iout is at the upper current value IH; when the voltage Vin is at the lower voltage limit VL, the set current value Iout is at the lower current value IL. The upper current value IH is higher than the lower current value IL. That is, when the voltage Vin is between the voltage upper limit value VH and the voltage lower limit value VL, the current value Iout is set as a functional relationship of the first power of the voltage Vin.

With the above design in FIG. 8H , when the output power of the electronic ballast is higher than the power consumption of the LED module driven by the driving circuit, the voltage Vin will increase over time and exceed the voltage upper limit VH. When the voltage Vin is higher than the upper voltage limit VH, the increase rate of the power consumption of the LED module is higher than the increase rate of the output power of the electronic ballast, and the voltage Vin is the high balance voltage VH+ and the current Iout is the high balance current IH+ , the output power and consumption power will be balanced or equal. At this time, the high balance voltage VH+ is higher than the voltage upper limit value VH, and the high balance current IH+ is higher than the upper current value VH. On the other hand, when the output power of the electronic ballast is lower than the consumption power of the LED module driven by the driving circuit, the voltage Vin will decrease with time and be lower than the voltage lower limit value VL. When the voltage Vin is lower than the lower voltage limit VL, the reduction rate of the power consumption of the LED module is higher than the reduction rate of the output power of the electronic ballast, and the voltage Vin is the low balance voltage VL- and the current Iout is the low balance current IL-, the output power and consumption power will be balanced or equal. At this time, the low balance voltage VL- is lower than the voltage lower limit value VL, and the low balance current IL- is lower than the lower current value IL.

In one embodiment, the voltage lower limit value VL is defined as about 90% of the lowest output voltage of the electronic ballast, and the voltage upper limit value VH is defined as 110% of the highest output voltage. Taking the full voltage of 100-277V AC/60HZ as an example, the voltage lower limit value VL is set to 90V (=100V*90%), and the voltage upper limit value VH is set to 305V (=277V*110%).

For example, the capacitors of the driving circuit, such as the capacitors 1634, 1734, 1834, and 1934 in FIG. 8C to FIG. 8F, may actually be formed by connecting two or more capacitors in parallel. Since inductors, controllers, switches, etc. are high-temperature components in electronic components, arranging some or all of the capacitors on a circuit board that is separated or far from the circuit board of the high-temperature components is helpful to make the capacitors (especially electrolytic capacitors) ) to avoid the influence of components with higher temperature on the life of the capacitor and improve the reliability of the capacitor. Further, the capacitor can be separated from the rectifier circuit and the filter circuit in space, which helps to reduce the EMI problem.

In some embodiments, the conversion efficiency of the driving circuit is above 80%, preferably above 90%, more preferably above 92%. Therefore, when the driving circuit is not included, the luminous efficiency of the LED lamp of the present invention is preferably 120lm/W or more, more preferably 160lm/W or more. On the other hand, after the driving circuit is combined with the LED component, the luminous efficiency of the LED lamp is preferably 120lm/W*90%=108lm/W or more, more preferably 160lm/W*92%=147.2lm/W or more.

In addition, considering that the light transmittance of the diffuser film or layer of the LED straight tube lamp is more than 85%, the luminous efficiency of the LED straight tube lamp of the present invention is preferably 108lm/W*85%=91.8lm/W or more, More preferably, it is 147.2lm/W*85%=125.12lm/W.

9A is a block diagram of a power module of an LED lamp according to an embodiment of the present invention. Compared with FIG. 8A , the embodiment of FIG. 9A includes a rectifier circuit 510 , a rectifier circuit 540 , a filter circuit 520 , an LED driving module 530 , and an anti-flicker circuit 550 is added. The anti-flicker circuit 550 is coupled between the filter circuit 520 and the LED driving module 530 . It should be noted that the rectifier circuit 540 is a circuit that can be omitted, and is indicated by a dotted line in FIG. 9A .

The anti-flicker circuit 550 is coupled to the filter output terminals 521 and 522 to receive the filtered signal, and under certain conditions, consume part of the energy of the filtered signal to suppress the ripple of the filtered signal causing the LED driving module 530 to emit light occur. Generally speaking, the filter circuit 520 has filter components such as capacitors and/or inductors, or there may be parasitic capacitors and inductors on the circuit to form a resonant circuit. When the resonant circuit stops or stops supplying the AC power signal, for example, after the user turns off the power of the LED light, the amplitude of the resonant signal will decrease with time. However, the LED module of the LED lamp is a one-way conduction member and requires a minimum conduction voltage. When the trough value of the resonant signal is lower than the minimum turn-on voltage of the LED module, and the peak value is still higher than the minimum turn-on voltage of the LED module, the light-emitting of the LED module will flicker. At this time, the anti-flicker circuit 550 will flow through a current matching the set anti-flicker current of the LED component, and consume part of the energy of the filtered signal, which is higher than the energy difference between the peak value and the trough value of the resonant signal, and Suppresses flickering. In some embodiments, the best time to operate the anti-flicker circuit 550 is when the filtered signal is close to (and still higher than) the minimum turn-on voltage.

It is worth noting that the anti-flicker circuit 550 is more suitable for the implementation in which the LED driving module 530 does not include the driving circuit 1530. For example, when the LED module 630 of the LED driving module 530 is (directly) driven to emit light by the filtered signal of the filtering circuit application. At this time, the light emission of the LED module 630 will directly reflect the change of the filtered signal due to its ripple. In this case, the setting of the anti-flicker circuit 550 will suppress the flicker phenomenon of the LED light after the power of the LED light is turned off.

9B is a schematic diagram of an anti-flicker circuit according to an embodiment of the present invention. Referring to FIG. 9B , the anti-flicker circuit 650 includes at least one resistor, such as two resistors connected in series, between the filter output terminals 521 and 522 in series. In this embodiment, the anti-flicker circuit 650 continuously consumes part of the energy of the filtered signal. When the LED lamp operates normally, this part of the energy is far less than the energy consumed by the LED driving module 530 . However, when the power is turned off and the level of the filtered signal drops to around the minimum turn-on voltage of the LED module 630, the anti-flicker circuit 650 still consumes part of the energy of the filtered signal to offset the resonance that may cause the LED module 630 to glow and flicker. influence of the signal. In some embodiments, the anti-flicker circuit 650 can be set to flow a current greater than or equal to the anti-flicker current level when the minimum on-voltage of the LED module 630 is set, and the anti-flicker circuit can be determined based on the set current 650 equivalent anti-flicker resistance value.

10A is a block diagram of a power module of an LED lamp according to an embodiment of the present invention. Compared with FIG. 9A , the embodiment of FIG. 10A includes a rectifier circuit 510 and a rectifier circuit 540 , a filter circuit 520 , an LED driving module 530 and an anti-flicker circuit 550 , and a protection circuit 560 is added. The protection circuit 560 is coupled to the filter output terminals 521 and 522, and detects the filtered signal from the filter circuit 520 to determine whether to enter the protection state. When entering the protection state, the protection circuit 560 limits, suppresses or clamps the level of the filtered signal, so as to prevent the components in the LED driving module 530 from being damaged. Among them, the rectifier circuit 540 and the anti-flicker circuit 550 are circuits that can be omitted, and are indicated by dotted lines in FIG. 10A .

10B is a schematic diagram of a protection circuit according to an embodiment of the present invention. Referring to FIG. 10B , the protection circuit 660 includes capacitors 663 and 670 , a resistor 669 , a diode 672 , a voltage clamp circuit and a voltage divider circuit, which are used to enter a protection state when the current and/or voltage of the LED module is too high, and avoid the LED module from being damaged. damage. The clamping circuit includes a triac (TRIAC) 661 and a DIAC or triac 662 . The voltage divider circuit includes bipolar junction transistors (BJTs) 667 and 668 , resistors 665 , 666 , 664 and 671 .

The first end of the triac 661 is coupled to the filter output end 521 , the second end is coupled to the filter output end 522 , and the control end is coupled to the first end of the triac 662 . The second end of the bidirectional trigger diode 662 is coupled to one end of the capacitor 663 , and the other end of the capacitor 663 is coupled to the filter output end 522 . One end of the resistor 664 is coupled to the second end of the triac 662 , the other end is coupled to the filter output end 522 , and is connected in parallel with the capacitor 663 . One end of the resistor 665 is coupled to the second end of the triac 662 , and the other end is coupled to the collector of the bidirectional junction transistor 667 . The emitter of the bipolar junction transistor 667 is coupled to the filter output terminal 522 . One end of the resistor 666 is coupled to the second end of the bidirectional trigger diode 662 , and the other end is coupled to the collector of the bidirectional junction transistor 668 and the base of the bidirectional junction transistor 667 . The emitter of the bipolar junction transistor 668 is coupled to the filter output 522 . One end of the resistor 669 is coupled to the base of the bipolar junction transistor 668 , and the other end is coupled to one end of the capacitor 670 . The other end of the capacitor 670 is coupled to the filter output end 522 . One end of the resistor 671 is coupled to the second end of the triac 662 , and the other end is coupled to the cathode of the diode 672 . The anode of the diode 672 is coupled to the filter output terminal 521 .

It is worth noting that the resistance value of the resistor 665 is smaller than the resistance value of the resistor 666 .

The operation of the overcurrent protection of the protection circuit 660 will first be described below.

The connection point between the resistor 669 and the capacitor 670 receives the current detection signal S531, wherein the current detection signal S531 represents the magnitude of the current flowing through the LED module. The other end of the resistor 671 is coupled to the voltage terminal 521'. In this embodiment, the voltage terminal 521' can be coupled to a bias voltage source or, as shown, coupled to the filter output terminal 521 through a diode 672 to use the filtered signal as a bias voltage source. When the voltage terminal 521' is coupled to an additional bias source, the diode 672 can be omitted, and in FIG. 10B , the diode 672 is represented by a dashed line. The combination of the resistor 669 and the capacitor 670 can filter out the high frequency components of the current detection signal S531 , and the filtered current detection signal S531 is input to the base of the bipolar junction transistor 668 to control the bipolar junction transistor 668 turn-on and turn-off. With the filtering effect of the resistor 669 and the capacitor 670, the malfunction of the bipolar junction transistor 668 caused by noise can be avoided. In practical applications, the resistor 669 and the capacitor 670 can be omitted (so the resistor 669 and the capacitor 670 are represented by dotted lines in FIG. 10B ). When they are omitted, the current detection signal S531 is directly input to the base of the bi-junction transistor 668 .

When the LED lamp is operating normally and the current of the LED module is within the normal range, the bipolar junction transistor 668 is turned off, and the resistor 666 pulls up the base voltage of the bipolar junction transistor 667 to make the bipolar junction junction Transistor 667 is turned on. At this time, the potential of the second terminal of the triac 662 is determined according to the voltage of the bias source of the power terminal 521' and the voltage dividing ratio of the resistor 671 and the parallel resistor 664 and the resistor 665. Since the resistance value of the resistor 665 is relatively small, the voltage dividing ratio of the resistor 665 is relatively low, so that the potential of the second end of the bidirectional trigger diode 662 is relatively low. At this time, the potential of the control terminal of the triac 661 is also pulled down by the triac 662, the triac 661 is turned off, and the protection circuit 660 is in an unprotected state.

When the current of the LED module exceeds an overcurrent value, the level of the current detection signal S531 will be too high to make the bipolar junction transistor 668 turn on, and then the bipolar junction transistor 668 will pull down the bipolar junction transistor 668. The voltage of the base of the carrier junction transistor 667 makes the bipolar junction transistor 667 off. At this time, the potential of the second terminal of the triac 662 is determined according to the voltage of the bias source of the power terminal 521' and the voltage dividing ratio of the resistor 671 and the parallel resistor 664 and the resistor 666. Since the resistance value of the resistor 666 is relatively large, the voltage dividing ratio of the resistor 666 is relatively high, so the potential of the second end of the bidirectional trigger diode 662 is relatively high. At this time, the potential of the control terminal of the triac 661 is also pulled up by the bidirectional trigger diode 662, and the triac 661 is turned on, so as to suppress or clamp the voltage difference between the filter output terminals 521 and 522 and make the protection circuit 660 is protected.

In this embodiment, the voltage of the bias source of the power supply terminal 521 ′ is based on the trigger voltage of the triac 661 , the voltage dividing ratio of the resistor 671 and the parallel resistor 664 and the resistor 665 , and the resistor 671 and the parallel resistor 664 and the resistor 665 . 666 partial pressure ratio to decide. Through the voltage division of the resistor 671 and the parallel resistor 664 and the resistor 665, the voltage at the power supply terminal 521' of the triac 662 will be lower than the trigger voltage of the triac 661. In addition, the voltage at the power supply terminal 521' of the triac 662 will be higher than the trigger voltage of the triac 661 through the voltage division of the resistor 671 and the parallel resistor 664 and the resistor 666. For example, in some embodiments, when the current of the LED module is greater than the overcurrent value, the voltage divider circuit adjusts the voltage division ratio of the resistor 671 and the parallel resistor 664 and the resistor 665 so that the power supply terminal 521 of the bidirectional trigger diode 662 ' The voltage ratio is higher, and the effect of hysteresis comparison is achieved. In terms of specific implementation, the bipolar junction transistors 667 and 668 serving as switching switches are connected in series with a resistor 665 and a resistor 666 which determine the voltage dividing ratio, respectively. The voltage divider circuit determines which of the bipolar junction transistors 667 and 668 is turned off and which is turned on according to whether the current of the LED module is greater than the overcurrent value, thereby determining the voltage dividing ratio. The clamping circuit decides whether to suppress or clamp the voltage of the LED module according to the divided voltage of the voltage dividing circuit.

Next, the operation of the overvoltage protection of the protection circuit 660 will be described.

The connection point between the resistor 669 and the capacitor 670 receives the current detection signal S531, wherein the current detection signal S531 represents the magnitude of the current flowing through the LED module. Therefore, at this time, the protection circuit 660 still has the function of current protection. The other end of the resistor 671 is coupled to the voltage terminal 521'. In this embodiment, the voltage terminal 521' is coupled to the positive terminal of the LED module to detect the voltage of the LED module. Taking the above-mentioned embodiment as an example, in the embodiment of FIG. 7A and FIG. 7B in which the LED driving module 530 does not include the driving circuit 1530 , the voltage terminal 521 ′ is coupled to the filter output terminal 521 ; in FIGS. 8A to 8G , etc. In the embodiment in which the LED driving module 530 includes the driving circuit 1530 , the voltage terminal 521 ′ is coupled to the driving output terminal 1521 . In this embodiment, the voltage dividing ratio of the resistor 671 and the parallel resistor 664 and the resistor 665 and the voltage dividing ratio of the resistor 671 and the parallel resistor 664 and the resistor 666 will depend on the voltage of the voltage terminal 521 ′, that is, the driving output terminal 1521 or The voltage at the filter output 521 is adjusted. Therefore, the overcurrent protection of the protection circuit 660 can still operate normally.

In some embodiments, when the LED module operates normally, assuming no overcurrent state occurs, the potential of the second terminal of the bidirectional trigger diode 662 (based on the voltage division ratio of the resistor 671 and the parallel resistor 665 and the resistor 664 and the voltage terminal 521 ′ voltage decision) is not enough to trigger the triac 661. At this time, the trigger triac 661 is turned off, and the protection circuit 660 is in an unprotected state. On the other hand, when the LED module operates abnormally, the voltage of the positive terminal of the LED module exceeds an overvoltage value. At this time, the potential of the second end of the triac 662 is high enough to trigger the triac 661 when the first end of the triac 662 exceeds the trigger voltage of the triac 661 . At this time, the trigger triac 661 is turned on, the protection circuit 660 is in a protection state and suppresses or clamps the level of the filtered signal.

As described above, the protection control circuit 660 may have overcurrent or overvoltage protection functions, or may have both overcurrent and overvoltage protection functions.

Additionally, in some embodiments, protection circuit 660 may include a Zener diode in parallel with resistor 664 for limiting or clamping the voltage across resistor 664 . The breakdown voltage of the Zener diode is preferably about 25-50V, more preferably about 36V.

Furthermore, the triac 661 can be replaced by a silicon controlled rectifier (Silicon Controlled Rectifier, SCR) without affecting the protection function of the protection circuit. Compared with the voltage drop across the triac 661 when turned on, using a silicon-controlled rectifier tube instead of the triac 661 can have a lower voltage drop across the triac 661 when turned on.

In one embodiment, the component parameters of the protection circuit 660 may be set as follows. The resistance value of the resistor 669 is preferably about 10 ohms. The capacitance of the capacitor 670 is preferably about 1 nf. The capacitance of the capacitor 633 is preferably about 10nf. The (on) voltage range of the triac 662 may be about 26-36V. The resistance value of the resistor 671 is preferably about 300K-600K ohm, more preferably about 540K ohm. The resistance value of the resistor 666 is preferably about 100K-300K ohm, more preferably about 220K ohm. The resistance value of the resistor 665 is preferably about 30K-100K ohm, more preferably about 40K ohm. The resistance value of the resistor 664 is preferably about 100K-300K ohm, more preferably about 220K ohm.

11A is a block diagram of a power module of an LED lamp according to an embodiment of the present invention. Compared with FIG. 8A , the embodiment of FIG. 11A includes a rectifier circuit 510 and a rectifier circuit 540 , a filter circuit 520 , an LED driving module 530 including a driving circuit 1530 and an LED module 630 , and a mode switching circuit 580 is added. The mode switching circuit 580 is coupled to at least one of the filter output terminals 521 and 522 and at least one of the driving output terminals 1521 and 1522 for determining whether to perform the first driving mode or the second driving mode. The first driving mode is to input the filtered signal to the driving circuit 1530, and the second driving mode is to bypass at least some components of the driving circuit 1530 to stop the operation of the driving circuit 1530 and input the filtered signal (directly) to drive the LED module. 630. Some components of the bypassed driving circuit 1530 include inductors or switches, so that the driving circuit 1530 cannot perform power conversion and/or conversion, and then stops the operation of conducting the filtered signal. If the driving circuit 1530 includes a capacitor, the capacitor can still be used to filter the ripple of the filtered signal to stabilize the voltage across the LED module. When the mode switching circuit 580 determines the first driving mode and inputs the filtered signal to the driving circuit 1530, the driving circuit 1530 converts the filtered signal into a driving signal to drive the LED module 630 to emit light. On the other hand, when the mode switching circuit 580 decides to perform the second driving mode and directly outputs the filtered signal to the LED module 630 and bypasses the driving circuit 1530 , the equivalent upper filter circuit 520 is the driving circuit of the LED module 630 . Then, the filter circuit 520 provides the filtered signal as the driving signal of the LED module, so as to drive the LED module to emit light.

It is worth noting that the mode switching circuit 580 can determine the first drive according to the user's command or the signal received by the detection LED light through the pins 501, 502, 503 and 504. mode or the second drive mode. By means of the mode switching circuit, the power module of the LED lamp can be adjusted to or perform one of the appropriate driving modes corresponding to different application environments or driving systems, thereby improving the compatibility of the LED lamp. In some embodiments, rectifier circuit 540 is an omittable circuit, and is thus represented in phantom in FIG. 11A.

11B is a schematic diagram of a mode switching circuit in an LED lamp according to an embodiment of the present invention. Referring to Fig. 11B, the mode switching circuit 680 includes a mode switching switch 681, which is suitable for the driving circuit 1630 shown in Fig. 8C. 11B and FIG. 8C , the mode switch 681 has three terminals 683 , 684 and 685 , the terminal 683 is coupled to the driving output terminal 1522 , the terminal 684 is coupled to the filter output terminal 522 and the terminal 685 is coupled to the inductor 1632 of the driving circuit 1630 .

When the mode switching circuit 680 determines the first mode, the mode switching switch 681 turns on the first current path of the terminals 683 and 685 and turns off the second current path of the terminals 683 and 684 . At this time, the driving output terminal 1522 is coupled to the inductor 1632 . Therefore, the driving circuit 1630 operates normally, and receives the filtered signals from the filtering output terminals 521 and 522 and converts them into driving signals, which are output from the driving output terminals 1521 and 1522 to drive the LED module.

When the mode switching circuit 680 determines the second mode, the mode switching switch 681 turns on the second current path of the terminals 683 and 684 and turns off the first current path of the terminals 683 and 685 . At this time, the filtering output terminal 522 is coupled to the driving output terminal 1522 . Therefore, the driving circuit 1630 stops operating. The filtered signal is input from the filtering output terminals 521 and 522 to the driving output terminals 1521 and 1522 for driving the LED module, and the inductor 1632 and the switch 1635 of the driving circuit 1630 are bypassed.

11C is a schematic diagram of a mode switching circuit of an LED lamp according to an embodiment of the present invention. Referring to Fig. 11C, the mode switching circuit 780 includes a mode switching switch 781, which is suitable for the driving circuit 1630 shown in Fig. 8C. 11C and 8C, the mode switch 781 has three terminals 783, 784, 785, the terminal 783 is coupled to the filter output terminal 522, the terminal 784 is coupled to the driving output terminal 1522, and the terminal 785 is coupled to the switching switch of the driving circuit 1630 1635.

When the mode switching circuit 780 determines the first mode, the mode switching switch 781 turns on the first current path of the terminals 783 and 785 and turns off the second current path of the terminals 783 and 784 . At this time, the filter output terminal 522 is coupled to the switch 1635 . Therefore, the driving circuit 1630 operates normally, and receives the filtered signals from the filtering output terminals 521 and 522 and converts them into driving signals, which are outputted by the driving output terminals 1521 and 1522 for driving the LED module.

When the mode switching circuit 780 determines the second mode, the mode switching switch 781 turns on the second current path of the terminals 783 and 784 and turns off the first current path of the terminals 783 and 785 . At this time, the filtering output terminal 522 is coupled to the driving output terminal 1522 . Therefore, the driving circuit 1630 stops operating. The filtered signal is input from the filtering output terminals 521 and 522 to the driving output terminals 1521 and 1522 for driving the LED module, and the inductor 1632 and the switch 1635 of the driving circuit 1630 are bypassed.

11D is a schematic diagram of a mode switching circuit of an LED lamp according to an embodiment of the present invention. Referring to Fig. 11D, the mode switching circuit 880 includes a mode switching switch 881, which is suitable for the driving circuit 1730 shown in Fig. 8D. Referring to FIG. 11D and FIG. 8D at the same time, the mode switch 881 has three terminals 883 , 884 and 885 , the terminal 883 is coupled to the filter output terminal 521 , the terminal 884 is coupled to the driving output terminal 1521 , and the terminal 885 is coupled to the inductor 1732 of the driving circuit 1730 .

When the mode switching circuit 880 determines the first mode, the mode switching switch 881 turns on the first current path of the terminals 883 and 885 and turns off the second current path of the terminals 883 and 884 . At this time, the filter output terminal 521 is coupled to the inductor 1732 . Therefore, the driving circuit 1730 operates normally, and receives the filtered signals from the filtering output terminals 521 and 522 and converts them into driving signals, which are outputted by the driving output terminals 1521 and 1522 for driving the LED module.

When the mode switching circuit 880 determines the second mode, the mode switching switch 881 turns on the second current path of the terminals 883 and 884 and turns off the first current path of the terminals 883 and 885 . At this time, the filtering output terminal 521 is coupled to the driving output terminal 1521 . Therefore, the driving circuit 1730 stops operating. The filtered signal is input from the filtering output terminals 521 and 522 to the driving output terminals 1521 and 1522 for driving the LED module, while bypassing the inductor 1732 and the freewheeling diode 1733 of the driving circuit 1730 .

11E is a schematic diagram of a mode switching circuit of an LED lamp according to an embodiment of the present invention. Referring to Fig. 11E, the mode switching circuit 980 includes a mode switching switch 981, which is suitable for the driving circuit 1730 shown in Fig. 8D. Referring to FIG. 11E and FIG. 8D at the same time, the mode switch 981 has three terminals 983 , 984 and 985 , the terminal 983 is coupled to the driving output terminal 1521 , the terminal 984 is coupled to the filter output terminal 521 and the terminal 985 is coupled to the freewheeling of the driving circuit 1730 The cathode of diode 1733.

When the mode switching circuit 980 determines the first mode, the mode switching switch 981 turns on the first current path of the terminals 983 and 985 and turns off the second current path of the terminals 983 and 984 . At this time, the cathode of the freewheeling diode 1733 is coupled to the filter output terminal 521 . Therefore, the driving circuit 1730 operates normally, and receives the filtered signals from the filtering output terminals 521 and 522 and converts them into driving signals, which are outputted by the driving output terminals 1521 and 1522 for driving the LED module.

When the mode switching circuit 980 determines the second mode, the mode switching switch 981 turns on the second current path of the terminals 983 and 984 and turns off the first current path of the terminals 983 and 985 . At this time, the filtering output terminal 521 is coupled to the driving output terminal 1521 . Therefore, the driving circuit 1730 stops operating. The filtered signal is input from the filtering output terminals 521 and 522 to the driving output terminals 1521 and 1522 for driving the LED module, while bypassing the inductor 1732 and the freewheeling diode 1733 of the driving circuit 1730 .

11F is a schematic diagram of a mode switching circuit of an LED lamp according to an embodiment of the present invention. Referring to FIG. 11F, the mode switching circuit 1680 includes a mode switching switch 1681, which is suitable for the driving circuit 1830 shown in FIG. 8E. 11F and FIG. 8E, the mode switch 1681 has three terminals 1683, 1684, 1685, the terminal 1683 is coupled to the filtering output terminal 521, the terminal 1684 is coupled to the driving output terminal 1521, and the terminal 1685 is coupled to the switching switch of the driving circuit 1830 1835.

When the mode switching circuit 1680 determines the first mode, the mode switching switch 1681 turns on the first current path of the terminals 1683 and 1685 and turns off the second current path of the terminals 1683 and 1684 . At this time, the filter output terminal 521 is coupled to the switch 1835 . Therefore, the driving circuit 1830 operates normally, and receives the filtered signals from the filtering output terminals 521 and 522 and converts them into driving signals, which are outputted by the driving output terminals 1521 and 1522 for driving the LED module.

When the mode switching circuit 1680 determines the second mode, the mode switching switch 1681 turns on the second current path of the terminals 1683 and 1684 and turns off the first current path of the terminals 1683 and 1685 . At this time, the filtering output terminal 521 is coupled to the driving output terminal 1521 . Therefore, the driving circuit 1830 stops operating. The filtered signal is input from the filter output terminals 521 and 522 to the driver output terminals 1521 and 1522 for driving the LED module, and bypasses the inductor 1832 and the switch 1835 of the driver circuit 1830 .

11G is a schematic diagram of a mode switching circuit of an LED lamp according to an embodiment of the present invention. Referring to FIG. 11G, the mode switching circuit 1780 includes a mode switching switch 1781, which is suitable for the driving circuit 1830 shown in FIG. 8E. Referring to FIG. 11G and FIG. 8E at the same time, the mode switch 1781 has three terminals 1783 , 1784 and 1785 , the terminal 1783 is coupled to the filter output terminal 521 , the terminal 1784 is coupled to the driving output terminal 1521 , and the terminal 1785 is coupled to the inductor 1832 of the driving circuit 1830 .

When the mode switching circuit 1780 determines the first mode, the mode switching switch 1781 turns on the first current path of the terminals 1783 and 1785 and turns off the second current path of the terminals 1783 and 1784 . At this time, the filter output terminal 521 is coupled to the inductor 1832 . Therefore, the driving circuit 1830 operates normally, and receives the filtered signals from the filtering output terminals 521 and 522 and converts them into driving signals, which are outputted by the driving output terminals 1521 and 1522 for driving the LED module.

When the mode switching circuit 1780 determines the second mode, the mode switching switch 1781 turns on the second current path of the terminals 1783 and 1784 and turns off the first current path of the terminals 1783 and 1785 . At this time, the filtering output terminal 521 is coupled to the driving output terminal 1521 . Therefore, the driving circuit 1830 stops operating. The filtered signal is input from the filter output terminals 521 and 522 to the driver output terminals 1521 and 1522 for driving the LED module, and bypasses the inductor 1832 and the switch 1835 of the driver circuit 1830 .

11H is a schematic diagram of a mode switching circuit of an LED lamp according to an embodiment of the present invention. Referring to FIG. 11H, the mode switching circuit 1880 includes mode switching switches 1881 and 1882, which are suitable for the driving circuit 1930 shown in FIG. 8F. 11H and 8F, the mode switch 1881 has three terminals 1883, 1884, 1885, the terminal 1883 is coupled to the driving output terminal 1521, the terminal 1884 is coupled to the filter output terminal 521, and the terminal 1885 is coupled to the freewheeling of the driving circuit 1930 Diode 1933. The mode switch 1882 has three terminals 1886 , 1887 and 1888 . The terminal 1886 is coupled to the driving output terminal 1522 , the terminal 1887 is coupled to the filtering output terminal 522 , and the terminal 1888 is coupled to the filtering output terminal 521 .

When the mode switching circuit 1880 determines the first mode, the mode switching switch 1881 turns on the first current path of the terminals 1883 and 1885 and turns off the second current path of the terminals 1883 and 1884, and the mode switching switch 1882 turns on the terminals 1886 and 1888. The third current path closes the fourth current path of terminals 1886 and 1887 . At this time, the driving output terminal 1521 is coupled to the freewheeling diode 1933 , and the filtering output terminal 521 is coupled to the driving output terminal 1522 . Therefore, the driving circuit 1930 operates normally, and receives the filtered signals from the filtering output terminals 521 and 522 and converts them into driving signals, which are output by the driving output terminals 1521 and 1522 for driving the LED module.

When the mode switching circuit 1880 determines the second mode, the mode switching switch 1881 turns on the second current path of the terminals 1883 and 1884 and turns off the first current path of the terminals 1883 and 1885, and the mode switching switch 1882 turns on the terminals 1886 and 1887. The fourth current path cuts off the third current path of terminals 1886 and 1888 . At this time, the filtering output terminal 521 is coupled to the driving output terminal 1521 , and the filtering output terminal 522 is coupled to the driving output terminal 1522 . Therefore, the driving circuit 1930 stops operating. The filtered signal is input from the filtering output terminals 521 and 522 to the driving output terminals 1521 and 1522 for driving the LED module, and bypasses the freewheeling diode 1933 and the switch 1935 of the driving circuit 1930 .

FIG. 11I is a schematic diagram of a mode switching circuit of an LED lamp according to an embodiment of the present invention. Referring to FIG. 11I, the mode switching circuit 1980 includes mode switching switches 1981 and 1982, which are suitable for the driving circuit 1930 shown in FIG. 8F. 11I and 8F, the mode switch 1981 has three terminals 1983, 1984, 1985, the terminal 1983 is coupled to the filter output terminal 522, the terminal 1984 is coupled to the driving output terminal 1522, and the terminal 1985 is coupled to the switching switch of the driving circuit 1930 1935. The mode switch 1982 has three terminals 1986 , 1987 and 1988 . The terminal 1986 is coupled to the filter output terminal 521 , the terminal 1987 is coupled to the driving output terminal 1521 , and the terminal 1988 is coupled to the driving output terminal 1522 .

When the mode switching circuit 1980 determines the first mode, the mode switching switch 1981 turns on the first current path of the terminals 1983 and 1985 and turns off the second current path of the terminals 1983 and 1984, and the mode switching switch 1982 turns on the terminals 1986 and 1988. The third current path closes the fourth current path at terminals 1986 and 1987 . At this time, the filtering output terminal 522 is coupled to the switch 1935 , and the filtering output terminal 521 is coupled to the driving output terminal 1522 . Therefore, the driving circuit 1930 operates normally, and receives the filtered signals from the filtering output terminals 521 and 522 and converts them into driving signals, which are output by the driving output terminals 1521 and 1522 for driving the LED module.

When the mode switching circuit 1980 determines the second mode, the mode switching switch 1981 turns on the second current path of the terminals 1983 and 1984 and turns off the first current path of the terminals 1983 and 1985, and the mode switching switch 1982 turns on the terminals 1986 and 1987. The fourth current path cuts off the third current path at terminals 1986 and 1988 . At this time, the filtering output terminal 521 is coupled to the driving output terminal 1521 , and the filtering output terminal 522 is coupled to the driving output terminal 1522 . Therefore, the driving circuit 1930 stops operating. The filtered signal is input from the filtering output terminals 521 and 522 to the driving output terminals 1521 and 1522 for driving the LED module, and bypasses the freewheeling diode 1933 and the switch 1935 of the driving circuit 1930 .

It is worth noting that the mode switch in the above embodiment can be, for example, a single-pole double-throw switch, or two semiconductor switches (eg, MOSFETs) for switching one of the two current paths to be on , and the other is cutoff. Each current path is used to provide a conduction path of the filtered signal, so that the current of the filtered signal flows through one of them to achieve the function of mode selection. For example, please refer to FIG. 3A , FIG. 3B and FIG. 3D at the same time, when the lamp tube driving circuit 505 does not exist and the LED straight tube lamp 500 is directly powered by the AC power source 508 , the mode switching circuit can determine the first mode, which is driven by the The circuit (such as the driving circuit 1530, 1630, 1730, 1830 or 1930) converts the filtered signal into a driving signal, so that the level of the driving signal can match the level required for the LED module to emit light, so that the LED module can be correctly driven to emit light. On the other hand, when the lamp driving circuit 505 exists, the mode switching circuit can determine the second mode, and the filtered signal can (almost) directly drive the LED module to emit light; or alternatively, the mode switching circuit can determine the first mode to drive the LEDs The module glows.

12A is a schematic block diagram of a power module of an LED lamp according to an embodiment of the present invention. Compared with the embodiment shown in FIG. 3E, the fluorescent lamp of the embodiment shown in FIG. 12A includes a rectifier circuit 510 and a rectifier circuit 540, a filter circuit 520 and an LED driving module 530, and further adds a ballast compatible circuit 1510. The ballast compatible circuit 1510 may be coupled between the pins 501 and/or the pins 502 and the rectifier circuit 510 . In this embodiment, the ballast compatible circuit 1510 is coupled between the pin 501 and the rectifier circuit as an example for illustration. In addition to FIG. 12A , please refer to FIG. 3A , FIG. 3B and FIG. 3D at the same time, the lamp driving circuit 505 is an electronic ballast, which provides an AC drive signal to drive the LED lamp of this embodiment.

When the driving system of the lamp driving circuit 505 is started up, the ability of the lamp driving circuit 505 to output relevant signals has not been fully improved to a normal state. However, the power module of the LED lamp immediately or quickly turns on or receives the AC driving signal provided by the lamp driving circuit 505 at the beginning of the startup. This will cause the LED lamp to be unable to be started through the lamp driver circuit 505 when the lamp driver circuit 505 is initially loaded by the LED lamp at the beginning of startup. For example, the internal components of the lamp driver circuit 505 draw power from the output converted in the lamp driver circuit 505 to maintain operation after start-up. At this time, the output voltage cannot normally rise to the level required at the beginning of startup, resulting in the failure of the lamp drive circuit 505 to start, or the Q value of the resonant circuit of the lamp drive circuit 505 is changed due to the addition of the load of the LED lamp. Unable to start smoothly, etc.

The ballast compatible circuit 1510 of this embodiment will be in an open state at the beginning of startup, so that the energy of the AC driving signal cannot be input to the LED module. After the set delay time elapses after the AC drive signal as the external drive signal is input to the LED straight tube lamp, the ballast compatible circuit 1510 switches from the off state during the delay period to the on state, so that the energy of the AC drive signal starts to be input to the LED light module. With the delay function of the ballast compatible circuit 1510, the operation of the LED lamp simulates the start-up characteristics of a fluorescent lamp, that is, the internal gas discharges normally and emits light after a delay time after the driving power is started. Therefore, the ballast compatible circuit 1510 further improves the compatibility of the LED lamp with the lamp driving circuit 505 such as an electronic ballast.

In this embodiment, the rectifier circuit 540 is a circuit that can be omitted, and is represented by a dotted line in FIG. 12A .

12B is a block diagram of a power module of an LED lamp according to an embodiment of the present invention. Compared with the embodiment shown in FIG. 12A , the ballast compatible circuit 1510 of the embodiment shown in FIG. 12B can be coupled between the pins 503 and/or the pins 504 and the rectifier circuit 540 . The ballast compatible circuit 1510 shown in FIG. 12A has the function of delaying the start of the LED lamp, which delays the input of the AC drive signal by a set time, preventing lamps such as electronic ballasts and the like. The problem that the drive circuit 505 fails to start up.

In addition to the ballast-compatible circuit 1510 being placed between the pins and the rectifier circuit as in the above-mentioned embodiment, the ballast-compatible circuit 1510 can also be changed into the rectifier circuit according to different rectifier circuit structures. 12C is a configuration of a ballast compatible circuit of an LED lamp according to a preferred embodiment of the present invention. Referring to FIG. 12C , in FIG. 4C , the rectifier circuit adopts the circuit structure of the rectifier circuit 810 shown in FIG. 4C . The rectifier circuit 810 includes a rectifier unit 815 and a terminal conversion circuit 541 . The rectification unit 815 is coupled to the pin 501 and the pin 502 , the terminal conversion circuit 541 is coupled to the rectification output terminal 511 and the rectified output terminal 512 , and the ballast compatible circuit 1510 is coupled between the rectification unit 815 and the terminal conversion circuit 541 . When the ballast starts up, the AC drive signal, which is an external drive signal, starts to be input to the LED straight tube lamp. The AC drive signal can only pass through the rectifier unit 815, but cannot pass through the terminal conversion circuit 541 and the internal filter circuit and LED drive module. , and the parasitic capacitances of the rectifier diode 811 and the rectifier diode 812 in the rectifier unit 815 are relatively small and can be ignored. Therefore, the equivalent capacitance or inductance of the power module of the LED lamp is not loaded or effectively connected to the lamp drive circuit 505 at the beginning of startup, so that the Q value of the lamp drive circuit 505 is not adversely affected and the LED lamp can pass through. The lamp drive circuit 505 starts up smoothly.

It is worth noting that, on the premise that the terminal conversion circuit 541 does not include components such as capacitors or inductances, the rectification unit 815 and the terminal conversion circuit 541 are exchanged, that is, the rectification unit 815 is coupled to the rectification output terminal 511 and the rectification output terminal 512. The conversion circuit 541 is coupled to the pin 501 and the pin 502 and does not affect or change the function of the ballast compatible circuit 1510 .

Furthermore, as described in FIG. 4A to FIG. 4D , when the pin 501 and the pin 502 of the rectifier circuit are changed to the pin 503 and the pin 504 , the rectifier circuit 540 can be used. That is, the circuit configuration of the above-mentioned ballast-compatible circuit 1510 in FIG. 12C can also be changed into the rectifier circuit 540 instead of the rectifier circuit 810 without affecting the function of the ballast-compatible circuit 1510 .

In addition, as mentioned above, the terminal conversion circuit 541 does not include components such as capacitors or inductors, or when the rectifier circuit 510 or the rectifier circuit 540 adopts the rectifier circuit 610 shown in FIG. 4A , the parasitic capacitance of the rectifier circuit 510 or the rectifier circuit 540 is relatively small and Therefore, it can be ignored and will not affect the Q value of the lamp driving circuit 505 .

12D is a block diagram of a power module of an LED lamp according to an embodiment of the present invention. Compared with the embodiment shown in FIG. 12A , the ballast compatible circuit 1510 of the embodiment shown in FIG. 12D is coupled between the rectifier circuit 540 and the filter circuit 520 . As explained above, the rectifier circuit 540 in this embodiment does not include components such as capacitors or inductors, and therefore does not affect the function of the ballast-compatible circuit 1510 in the embodiment of FIG. 12D .

12E is a block diagram of a power module of an LED lamp according to an embodiment of the present invention. Compared with the embodiment shown in FIG. 12A , the ballast compatible circuit 1510 of the embodiment shown in FIG. 12E is coupled between the rectifier circuit 510 and the filter circuit 520 . Likewise, the rectifier circuit 510 in this embodiment does not include components such as capacitors or inductors, and thus does not affect the function of the ballast-compatible circuit 1510 in the embodiment of FIG. 12E .

12F is a schematic diagram of a ballast compatible circuit according to an embodiment of the present invention. Referring to FIG. 12F , the initial state of the ballast-compatible circuit 1610 is that the ballast-compatible input terminal 1611 and the ballast-compatible output terminal 1621 are equivalently open circuits. The ballast-compatible circuit 1610 turns on the ballast-compatible input terminal 1611 and the ballast-compatible output terminal 1621 after a set time after receiving the signal at the ballast-compatible input terminal 1611, so that the signal received by the ballast-compatible input terminal 1611 is transmitted. to ballast compatible output 1621.

The ballast compatible circuit 1610 includes a diode 1612, resistors 1613, 1615, 1618, 1620 and 1622, a triac 1614, a DIAC or a triac 1617, a capacitor 1619, a ballast compatible input terminal 1611 and a ballast compatible output terminal 1621. It should be noted that the resistance value of the resistor 1613 should be quite large, so when the triac 1614 is turned off in an open state, the ballast-compatible input terminal 1611 and the ballast-compatible output terminal 1621 are equivalently open-circuited.

The triac 1614 is coupled between the ballast compatible input terminal 1611 and the ballast compatible output terminal 1621, and the resistor 1613 is also coupled between the ballast compatible input terminal 1611 and the ballast compatible output terminal 1621 to communicate with the bidirectional controllable Silicon 1614 in parallel. The diode 1612 , the resistors 1620 , 1622 and the capacitor 1619 are connected in series between the ballast compatible input terminal 1611 and the ballast compatible output terminal 1621 in sequence, and are connected in parallel with the triac 1614 . The anode of diode 1612 is connected to triac 1614 and the cathode is connected to one end of resistor 1620. The control terminal of the triac 1614 is connected to one end of the triac 1617, the other end of the triac 1617 is connected to one end of the resistor 1618, and the other end of the resistor 1618 is coupled to the connection terminals of the capacitor 1619 and the resistor 1622. The resistor 1615 is coupled between the control terminal of the triac 1614 and the connection terminal of the resistor 1613 and the capacitor 1619.

When an AC drive signal (eg high frequency, high voltage AC signal output by an electronic ballast) starts to be input to the ballast compatible input terminal 1611, the triac 1614 is in an open state first, so that the AC drive signal cannot be input and the The LED lights are also open. The AC drive signal starts to charge the capacitor 1619 through the diode 1612 and the resistors 1620 and 1622, so that the voltage of the capacitor 1619 gradually increases. After continuing to charge for a period of time, the voltage of the capacitor 1619 rises to exceed the threshold of the triac 1617 so that the triac 1617 is turned on. Then, the conducting triac 1617 triggers the triac 1614, so that the triac 1614 is also turned on. At this time, the conductive triac 1614 is electrically connected to the ballast-compatible input terminal 1611 and the ballast-compatible output terminal 1621, so that the AC driving signal is input through the ballast-compatible input terminal 1611 and the ballast-compatible output terminal 1621, so that the LED light The power module starts to operate. In addition, the energy stored in the capacitor 1619 keeps the triac 1614 turned on, so as to prevent the triac 1614, that is, the ballast compatible circuit 1610 from being turned off again due to the AC change of the AC driving signal, or to prevent the triac 1614 from turning off again. The problem of alternating or changing between on and off.

Generally, the output voltage of the electronic ballast can be increased to a certain voltage value after several hundred milliseconds after the lamp driving circuit 505 is started, without being adversely affected by the addition of the load of the LED lamp. In addition, the lamp driving circuit 505 such as an electronic ballast is provided with a detection mechanism for detecting whether the fluorescent lamp is lit. If the fluorescent lamp is not lit after a period of time, it is judged that the fluorescent lamp is abnormal and enters a protection state. Therefore, in some embodiments, the delay time of the ballast-compatible circuit 1610 and then the ballast-compatible circuit 1610 before the LED lamp is turned on is preferably between about 0.1 seconds and 3 seconds.

It is worth noting that the resistor 1622 can be an additional capacitor 1623 in parallel. The function of the capacitor 1623 is to reflect or support the instantaneous change of the voltage difference between the ballast-compatible input terminal 1611 and the ballast-compatible output terminal 1621 , without affecting the delayed turn-on of the ballast-compatible circuit 1610 .

12G is a block diagram of a power module of an LED straight tube lamp according to an embodiment of the present invention. Compared with the embodiment shown in FIG. 3D , the lamp driving circuit 505 of the embodiment of FIG. 12G drives a plurality of LED straight lamps 500 connected in series, and each LED straight lamp 500 is equipped with a ballast compatible circuit 1610 . For the convenience of description, two LED straight tube lamps 500 connected in series are taken as an example for description below.

Because the delay times of the ballast compatible circuits 1610 in the two LED straight tube lamps 500 before the LED straight tube lamps 500 are turned on have different delay times due to the influence of errors in the component production process and other factors, the two ballasts have different delay times. The actual on-time of the compatible circuit 1610 is not consistent. When the lamp drive circuit 505 is activated, the voltage of the AC drive signal provided by the lamp drive circuit 505 is approximately equally shared by the two LED straight lamps 500 . Then, when one of the ballast compatible circuits 1610 is turned on first, the voltage of the AC driving signal of the lamp driving circuit 505 almost or completely falls on the other LED straight tube lamp 500 which has not been turned on. This suddenly increases or doubles the voltage across the ballast-compatible circuit 1610 of the LED straight tube lamp 500 that has not been turned on, that is, the voltage difference between the ballast-compatible input terminal 1611 and the ballast-compatible output terminal 1621 suddenly doubles. Due to the existence of the capacitor 1623, the voltage dividing effect of the capacitors 1619 and 1623 will instantly increase the voltage of the capacitor 1619, so that the bidirectional trigger diode 1617 triggers the triac 1614 to conduct, thereby making the two LED straight tube lamps 500 ballast Compatibility circuit 1610 is turned on almost simultaneously. With the addition of the capacitor 1623, it can be avoided that the delay time of the ballast compatible circuit 1610 is different between the LED straight tube lamps 500 in series, causing the triac 1614 in the ballast compatible circuit 1610 to be turned on first due to maintaining conduction. The problem that the current is insufficient and it is cut off again. Therefore, adding the capacitor 1623 to the ballast compatible circuit 1610 can further improve the compatibility of the LED straight tube lamps connected in series.

In practical applications, the recommended capacitance value of the capacitor 1623 is between about 10pF to about 1nF, preferably about 10pF to about 100PF, and more preferably about 47pF.

Notably, the diode 1612 is used or configured to rectify the signal charged by the capacitor 1619 . Therefore, referring to FIG. 12C , FIG. 12D and FIG. 12E , when the ballast compatible circuit 1610 is disposed after the rectifier unit or the rectifier circuit, the diode 1612 can be omitted. Therefore, in Figure 12F, diode 1612 is shown in dashed lines.

12H is a schematic diagram of a ballast compatible circuit according to another embodiment of the present invention. Referring to FIG. 12H , the initial state in the ballast-compatible circuit 1710 is an equivalent open circuit between the ballast-compatible input terminal 1711 and the ballast-compatible output terminal 1721 . After the ballast-compatible input terminal 1711 receives the input signal, the ballast-compatible circuit 1710 is turned off when the level of the external driving signal is less than the set value corresponding to the turn-on delay time of the ballast-compatible circuit 1710, and the input external drive signal is turned off. When the level of the signal is greater than the set value, the ballast-compatible circuit 1710 is turned on, so that the input signal is transmitted to the ballast-compatible output terminal 1721 .

The ballast compatible circuit 1710 includes a triac 1712 , a DIAC or a triac 1713 , resistors 1714 , 1716 and 1717 , and a capacitor 1715 . The first end of the triac 1712 is coupled to the ballast compatible input end 1711 , the control end is coupled to one end of the triac 1713 and one end of the resistor 1714 , and the second end is coupled to the other end of the resistor 1714 . One end of the capacitor 1715 is coupled to the other end of the triac 1713 , and the other end is coupled to the second end of the triac 1712 . The resistor 1717 is connected in parallel with the capacitor 1715 , and thus is also coupled to the other end of the triac 1713 and the second end of the triac 1712 . One end of the resistor 1716 is coupled to the connection point between the triac 1713 and the capacitor 1715 , and the other end is coupled to the ballast compatible output end 1721 .

When an AC driving signal (eg high frequency, high voltage AC signal output by an electronic ballast) starts to be input to the ballast compatible input terminal 1711, the triac 1712 is in a cut-off state first, so that the AC driving signal cannot be input. The LED lights are also open. The input of the AC driving signal will cause a voltage difference between the ballast compatible input terminal 1711 and the ballast compatible output terminal 1721 of the ballast compatible circuit 1710 . When the AC drive signal increases with time and reaches a sufficient amplitude (setting the delay level value) after a period of time, the level of the ballast compatible output terminal 1721 passes through the resistor 1716 , the parallel capacitor 1715 , the resistor 1717 and the resistor 1714 It is reflected to the control terminal of the triac 1712 to trigger the triac 1712 to conduct. At this time, the ballast compatible circuit 1710 is turned on to make the LED lamp operate normally. After the triac 1712 is turned on, a current flows through the resistor 1716 and charges the capacitor 1715 to store a certain voltage in the capacitor 1715 . The energy stored in the capacitor 1715 keeps the triac 1712 turned on, so as to prevent the triac 1712, that is, the ballast compatible circuit 1710 from being turned off again due to the AC change of the AC drive signal, or to prevent the triac 1712 from turning on. Alternating or changing issues with cutoffs.

12I is a schematic diagram of a ballast compatible circuit according to an embodiment of the present invention. 12I, the ballast compatible circuit 1810 includes a housing 1812, a metal electrode 1813, a bimetal 1814, and a heating wire 1816. The metal electrode 1813 and the heating wire 1816 pass through the casing 1812 , so part of it is inside the casing 1812 and part is outside the casing 1812 . Also, the portion of the metal electrode 1813 outside the casing has a ballast-compatible input terminal 1811, and the portion of the heating wire 1816 outside the casing has a ballast-compatible output terminal 1821. The casing 1812 is in a sealed state and filled with an inert gas 1815, such as helium. The bimetal 1814 is located within the housing 1812 and is physically and electrically connected to the portion of the heating wire 1816 inside the housing 1812. There is a certain interval between the bimetal 1814 and the metal electrode 1813, so the ballast-compatible input terminal 1811 and the ballast-compatible output terminal 1821 are not electrically connected in the initial state. The bimetallic sheet 1814 has two metal sheets with different temperature coefficients, the metal sheet near the metal electrode 1813 has a lower temperature coefficient, and the metal sheet farther from the metal electrode 1813 has a higher temperature coefficient.

When an AC driving signal (eg, a high-frequency, high-voltage AC signal output by an electronic ballast) begins to be input to the ballast-compatible input terminal 1811 and the ballast-compatible output terminal 1821, a metal electrode 1813 and the heating wire 1816 will form between the metal electrode 1813 and the heating wire 1816. Potential difference. When the potential difference is large enough to break down the inert gas 1815 to generate arc or arc discharge, that is, when the AC drive signal increases with time and reaches the set delay level value after a period of time, the inert gas 1815 heats up and causes the bimetallic sheet 1814 expands toward the metal electrode 1813 and approaches (see the direction of the dashed arrow in FIG. 12I ), and finally makes the bimetal 1814 contact with the metal electrode 1813 through the expansion to form a physical electrical connection. At this time, the ballast-compatible input terminal 1811 and the ballast-compatible output terminal 1821 are connected to each other. Then, the AC driving signal flows through the heating wire 1816 to make the heating wire 1816 generate heat. At this time, a current flows through the heating wire 1816 when the metal electrode 1813 and the bimetal strip 1814 are in an electrical conduction state, so that the temperature of the bimetal strip 1814 is maintained above a predetermined conduction temperature. Since the temperature of the two metal sheets with different temperature coefficients of the bimetal sheet 1814 is maintained higher than the set conduction temperature, the bimetal sheet 1814 is deflected towards the metal electrode 1813 and touches, thus maintaining or supporting the bimetal sheet 1814 and the metal electrode The physical union or connection of 1813.

Therefore, after the ballast-compatible input terminal 1811 and the ballast-compatible output terminal 1821 receive the input signal, the ballast-compatible circuit 1810 turns on the ballast-compatible input terminal 1811 and the ballast-compatible output terminal 1821 after a set time.

Therefore, the exemplary ballast-compatible circuit described herein can be coupled between any pin and any rectifier circuit to set the delay time of the ballast-compatible circuit after the external driving signal starts to be input to the LED straight tube lamp It is turned off inside and turned on after the set delay time, or the ballast compatible circuit is turned off when the level of the input external drive signal is less than the set value corresponding to the on-delay time of the ballast compatible circuit. When the level of the external drive signal of the stream compatible circuit is greater than the set value, it is turned on. Therefore, by using such a ballast compatible circuit, the compatibility of the LED straight tube lamp described herein to the lamp driving circuit 505 such as an electronic ballast is further improved.

13A is a block diagram of a power module of an LED straight tube lamp according to an embodiment of the present invention. Compared with the embodiment shown in FIG. 3E , the fluorescent lamp of this embodiment includes a rectifier circuit 510 and a rectifier circuit 540 , a filter circuit 520 and an LED driving module 530 , and further adds two ballast compatible circuits 1540 . The two ballast compatible circuits 1540 are coupled between the pin 503 and the rectifier output terminal 511 and between the pin 504 and the rectifier output terminal 511, respectively. 3A, 3B and 3D at the same time, the lamp driving circuit 505 is an electronic ballast, and provides an AC driving signal to drive the LED lamp of this embodiment.

The initial state of the two ballast compatible circuits 1540 is turned on and turned off after a period of time. Therefore, when the lamp driving circuit 505 starts up, the AC driving signal passes through the pin 503, the corresponding ballast compatible circuit 1540 and the rectifier output end 511 and the rectifier circuit 510 or pin 504, the corresponding ballast compatible circuit 1540 and the rectifier The output terminal 511 and the rectifier circuit 510 flow through the LED lamp, and bypass the filter circuit 520 and the LED driving module 530 inside the LED lamp. Therefore, when the lamp driving circuit 505 starts up, the LED lamp is equivalent to no load, and the LED lamp does not affect the Q value of the lamp driving circuit 505 at the beginning of the lamp driving circuit 505, so that the lamp driving circuit 505 can be started smoothly. . The two ballast compatible circuits 1540 are turned off after a period of time, at which time the lamp driving circuit 505 has been successfully started. Afterwards, the lamp driving circuit 505 has sufficient driving capability to drive the LED lamp to emit light.

13B is a block diagram of a power module of an LED straight tube lamp according to an embodiment of the present invention. Compared with the embodiment shown in FIG. 13A , the configuration of the two ballast compatible circuits 1540 in this embodiment is changed to be respectively coupled between the pin 503 and the rectifier output end 512 and between the pin 504 and the rectifier output end 512 . Similarly, the initial state of the two ballast compatible circuits 1540 is on, and then off after a set delay time. Therefore, the lamp driving circuit 505 starts to drive the LED lamp to emit light only after the lamp driving circuit 505 is successfully started.

It should be noted that the configuration of the two ballast compatible circuits 1540 can also be changed to be respectively coupled between the pin 501 and the rectifier output end 511 and between the pin 502 and the rectifier output end 511 , or be respectively coupled to Between the pin 501 and the rectifier output end 512 and between the pin 502 and the rectifier output end 512, the lamp driving circuit 505 can still be started to drive the LED light to emit light.

13C is a block diagram of a power module of an LED straight tube lamp according to an embodiment of the present invention. Compared with the embodiment shown in FIGS. 13A and 13B , the rectifier circuit 540 of this embodiment is changed to the rectifier circuit 810 shown in FIG. 4C , wherein the rectifier unit 815 of the rectifier circuit 810 is coupled to the pin 503 and the pin 504 , The endpoint conversion circuit 541 is coupled to the rectification output terminal 511 and the rectification output terminal 512 . The configuration of the two ballast compatible circuits 1540 is also changed to be coupled between the pin 501 and the half-wave connection point 819 and between the pin 502 and the half-wave connection point 819 , respectively.

When the lamp driving circuit 505 starts up, the initial states of the two ballast compatible circuits 1540 are turned on. At this time, the AC drive signal passes through the pin 501 , the corresponding ballast-compatible circuit 1540 , the half-wave connection point 819 and the rectifier unit 815 or the pin 502 , the corresponding ballast-compatible circuit 1540 , the half-wave connection point 819 and the rectifier unit 815 It flows through the LED lamp and bypasses the end point conversion circuit 541 , the filter circuit 520 and the LED driving module 530 inside the LED lamp. Therefore, when the lamp driving circuit 505 starts up, the LED lamp is equal to no load, and the LED lamp does not affect the Q value of the lamp driving circuit 505 at the beginning of the starting of the lamp driving circuit 505, so that the lamp driving circuit 505 can be started smoothly. . The two ballast compatible circuits 1540 are turned off after a period of time, at which time the lamp driving circuit 505 has been successfully started. Afterwards, the lamp driving circuit 505 has sufficient driving capability to drive the LED lamp to emit light.

It is worth noting that the embodiment of FIG. 13C can also be changed to the rectifier circuit 510 instead of the rectifier circuit 540 to use the rectifier circuit 810 shown in FIG. The rectifier output terminal 511 and the rectifier output terminal 512 are coupled; the configuration of the two ballast compatible circuits 1540 is also changed to be respectively coupled between the pin 503 and the half-wave connection point 819 and between the pin 504 and the half-wave connection point 819 .

13D is a schematic diagram of a ballast-compatible circuit according to an embodiment of the present invention, which can be applied to the embodiments shown in FIGS. 13A to 13C and the modifications described in the corresponding description.

The ballast compatible circuit 1640 includes resistors 1643 , 1645 , 1648 and 1650 , capacitors 1644 and 1649 ; diodes 1647 and 1652 , bipolar junction transistors 1646 and 1651 , a ballast compatible input terminal 1641 and a ballast compatible output terminal 1642 . One end of the resistor 1645 is connected to the ballast compatible input end 1641 , and the other end is coupled to the emitter of the bipolar junction transistor 1646 . The collector of the bipolar junction transistor 1646 is coupled to the anode of the diode 1647 , and the cathode of the diode 1647 is coupled to the ballast compatible output terminal 1642 . The resistor 1643 and the capacitor 1644 are connected in series between the emitter and the collector of the bipolar junction transistor 1646 , and the connection point of the resistor 1643 and the capacitor 1644 is coupled to the base of the bipolar junction transistor 1646 . One end of the resistor 1650 is connected to the ballast compatible output end 1642 , and the other end of the resistor 1650 is coupled to the emitter of the bipolar junction transistor 1651 . The collector of bipolar junction transistor 1651 is coupled to the anode of diode 1652 , and the cathode of diode 1652 is coupled to ballast compatible input terminal 1641 . The resistor 1648 and the capacitor 1649 are connected in series between the emitter and the collector of the bipolar junction transistor 1651, and the connection point of the resistor 1648 and the capacitor 1649 is coupled to the base of the bipolar junction transistor 1651.

The voltage across capacitors 1644 and 1649 is about zero when the lamp driving circuit 505, such as an electronic ballast, is just started. At this time, the bases of the bipolar junction transistors 1646 and 1651 flow a certain current and are turned on. Therefore, at the beginning of the activation of the lamp driving circuit 505, the ballast compatible circuit 1640 is in a conducting state. The AC drive signal charges the capacitor 1644 through the resistor 1643 and the diode 1647 , and similarly charges the capacitor 1649 through the resistor 1648 and the diode 1652 . After a certain period of time, the voltages of the capacitors 1644 and 1649 increase to a certain level, which reduces the voltages of the resistors 1643 and 1648 and turns off the bipolar junction transistors 1646 and 1651 (that is, the bipolar junction transistors 1646 and 1651 are in the off state). At this time, the ballast compatible circuit 1640 is turned off. In this way, the internal capacitance or inductance does not affect the Q value of the lamp driving circuit 505 at the beginning, so as to ensure the smooth startup of the lamp driving circuit 505 . Therefore, the ballast compatibility circuit 1640 can improve the compatibility of the LED lamp with the electronic ballast.

To sum up, the two ballast compatible circuits of the present invention are respectively coupled between a connection point of the rectifier circuit and the filter circuit (ie one of the rectifier output end 511 and the rectifier output end 512 ) and the pin 501 . and between the connection point of the rectifier circuit and the filter circuit and the pin 502, or between the connection point of the rectifier circuit and the filter circuit and the pin 503 and the connection point of the rectifier circuit and the filter circuit and the pin 504, respectively . The two ballast-compatible circuits are turned on for a set delay time after the external drive signal starts to be input to the LED straight tube lamp, and are turned off after the set delay time, which improves the LED lamp's effect on the electronic ballast. compatibility.

14A is a block diagram of a power module of an LED straight tube lamp according to an embodiment of the present invention. Compared with the embodiment shown in FIG. 3E , the LED straight tube lamp of this embodiment includes a rectifier circuit 510 and a rectifier circuit 540 , a filter circuit 520 and an LED driving module 530 , and further adds two filament simulation circuits 1560 . The two filament simulation circuits 1560 are respectively coupled between the pins 501 and 502 and between the pins 503 and 504 to improve the lamp driving circuit with filament detection, such as program-activated ballast device compatibility.

The lamp drive circuit with filament detection will detect whether the filament of the lamp is normal at the beginning of startup without short-circuit or open-circuit abnormality. When it is judged that the filament is abnormal, the lamp drive circuit will stop and enter the protection state. In order to prevent the lamp drive circuit from judging that the LED lamp is abnormal because the LED straight lamp has no filament, the two-filament simulation circuit 1560 can simulate the operation of the actual filament of the fluorescent tube, and enable the lamp drive circuit to normally start to drive the LED lamp to emit light.

14B is a schematic diagram of a filament simulation circuit according to an embodiment of the present invention. The filament simulation circuit 1660 includes a capacitor 1663 and a resistor 1665 connected in parallel, and the two ends of the capacitor 1663 and the resistor 1665 are respectively coupled to the filament simulation terminals 1661 and 1662. 14A, the filament simulation terminals 1661 and 1662 of the two filament simulation circuits 1660 are coupled to the pins 501 and 502 and the pins 503 and 504. During the filament detection process, the lamp driving circuit outputs a detection signal to test whether the filament is normal. The detection signal will pass through the capacitor 1663 and the resistor 1665 connected in parallel to enable the lamp drive circuit to determine whether the filament of the LED lamp is normal.

It is worth noting that the capacitance of the capacitor 1663 is relatively small. Therefore, the capacitive reactance (equivalent resistance) of the capacitor 1663 is much smaller than the resistance of the resistor 1665 because the lamp driving circuit outputs a high-frequency AC signal to drive the LED lamp. In this way, the power consumed by the filament simulation circuit 1660 during normal operation of the LED lamp is quite small and hardly affects the luminous efficiency of the LED lamp.

14C is a schematic block diagram of a filament simulation circuit according to an embodiment of the present invention. In this embodiment, the rectifier circuit 510 and/or the rectifier circuit 540 in the LED lamp adopts the rectifier circuit 810 shown in FIG. That is, the filament simulation circuit 1660 of this embodiment has the functions of filament simulation and end point conversion at the same time. 14A, the filament simulation terminals 1661 and 1662 of the filament simulation circuit 1660 are coupled to the pins 501 and 502 and/or the pins 503 and 504. The half-wave connection point 819 of the rectifier unit 815 in the rectifier circuit 810 is coupled to the filament analog terminal 1662 .

14D is a block diagram of a filament simulation circuit according to some embodiments of the present invention. Compared with the embodiment shown in FIG. 14C , the half-wave connection point 819 is changed to be coupled to the filament simulation terminal 1661 , and the filament simulation circuit 1660 of this embodiment still has the functions of filament simulation and terminal conversion.

14E is a schematic diagram of a filament simulation circuit according to another embodiment of the present invention. Filament emulation circuit 1760 includes capacitors 1763 and 1764 , and resistors 1765 and 1766 . Capacitors 1763 and 1764 are connected in series between the filament analog terminals 1661 and 1662 . Resistors 1765 and 1766 are also connected in series between the filament analog terminals 1661 and 1662 , and the connection points of the resistors 1765 and 1766 are coupled to the connection points of the capacitors 1763 and 1764 . Please also refer to FIG. 14A , the filament simulation terminals 1661 and 1662 of the two filament simulation circuits 1760 are coupled to the pins 501 and 502 and the pins 503 and 504 . When the lamp drive circuit outputs a detection signal to test whether the filament is normal, the detection signal will pass through the capacitors 1763 and 1764 and resistors 1765 and 1766 in series to enable the lamp drive circuit to determine whether the filament of the LED lamp is normal.

It is worth noting that, in some embodiments, the capacitances of the capacitors 1763 and 1764 are small. Therefore, since the lamp driving circuit outputs high-frequency AC signals for driving the LED lights, the capacitances of the capacitors 1763 and 1764 connected in series are far smaller than those of the capacitors 1763 and 1764 connected in series. Resistance of resistors 1765 and 1766. Therefore, when the LED lamp operates normally, the power consumed by the filament simulation circuit 1760 is relatively small and hardly affects the luminous efficiency of the LED lamp. Furthermore, if any of the capacitor 1763 or the resistor 1765 is open or short-circuited, or any of the capacitor 1764 or the resistor 1766 is open or short-circuited, the detection signal can still flow through the filament simulation circuit 1760 between the filament simulation terminals 1661 and 1662 . Therefore, if any capacitor 1763 or resistor 1765 is open or short-circuited and/or any capacitor 1764 or resistor 1766 is open or short-circuited, the filament emulation circuit 1760 can still operate normally with a relatively high fault tolerance rate.

14F is a schematic block diagram of a filament simulation circuit according to an embodiment of the present invention. In this embodiment, the rectifier circuit 510 and/or the rectifier circuit 540 adopts the rectifier circuit 810 shown in FIG. 4C but omits the end point conversion circuit 541 , and the filament simulation circuit 1860 replaces the function of the end point conversion circuit 541 . For example, the filament emulation circuit 1860 of this embodiment also has the functions of filament emulation and endpoint conversion at the same time. The filament emulation circuit 1860 has a negative temperature coefficient resistance value, and the resistance value is lower when the temperature is high than when the temperature is low. In this embodiment, the filament simulation circuit 1860 includes two negative temperature coefficient resistors 1863 and 1864 , which are connected in series and coupled between the filament simulation terminals 1661 and 1662 . 14A, the filament simulation terminals 1661 and 1662 of the filament simulation circuit 1860 are coupled to the pins 501 and 502 and/or the pins 503 and 504. The half-wave connection point 819 of the rectifier unit 815 in the rectifier circuit 810 is coupled to the connection point of the negative temperature coefficient resistors 1863 and 1864 .

When the lamp drive circuit outputs a detection signal to test whether the filament is normal, the detection signal will pass through the NTC resistors 1863 and 1864 to enable the lamp drive circuit to determine whether the filament of the LED lamp is normal. In addition, the temperature of the negative temperature coefficient resistors 1863 and 1864 gradually increases and decreases the resistance value due to the test signal or the preheating process. When the lamp driving circuit enters the normal state to normally start the LED lamp, the resistances of the series-connected NTC resistors 1863 and 1864 have been reduced to a relatively low value, thereby reducing the loss of power consumption of the filament emulation circuit 1860 .

The resistance value of the filament simulation circuit 1860 is preferably 10 ohms or more at room temperature (25°C), and when the lamp driving circuit enters a normal state, the resistance value of the filament simulation circuit 1860 is reduced to about 2-10 ohms; more preferably However, when the lamp driving circuit enters a normal state, the resistance of the filament emulation circuit 1860 is reduced to about 3-6 ohms.

15A is a block diagram of a power module of an LED straight tube lamp according to an embodiment of the present invention. Compared with the embodiment shown in FIG. 3E , the LED straight tube lamp of this embodiment includes a rectifier circuit 510 and a rectifier circuit 540 , a filter circuit 520 and an LED driving module 530 , and an overvoltage protection circuit 1570 is further added. The overvoltage protection circuit 1570 is coupled to the filter output terminals 521 and 522 to detect the filtered signal. When the level of the filtered signal is higher than the set overvoltage value, the overvoltage protection circuit 1570 clamps the level of the filtered signal. Therefore, the overvoltage protection circuit 1570 can protect the components of the LED driving module 530 from being damaged by the overvoltage. Since the rectifier circuit 540 can be omitted, it is represented by a dotted line in the figure.

15B is a schematic diagram of an overvoltage protection circuit according to an embodiment of the present invention. The overvoltage protection circuit 1670 includes a Zener diode 1671 , such as a Zener diode, coupled to the filter output terminals 521 and 522 . The Zener diode 1671 is turned on when the voltage difference between the filter output terminals 521 and 522 (ie, the level of the filtered signal) reaches the breakdown voltage, so that the voltage difference is clamped to the breakdown voltage. The breakdown voltage is preferably in the range of about 40V to about 100V, more preferably in the range of about 55V to about 75V.

16A is a block diagram of a power module of an LED straight tube lamp according to an embodiment of the present invention. Compared with the embodiment of FIG. 14A , the LED lamp of this embodiment includes a rectifier circuit 510 and a rectifier circuit 540 , a filter circuit 520 , an LED driving module 530 and two filament simulation circuits 1560 , and a ballast detection circuit 1590 is added. The ballast detection circuit 1590 can be coupled to any one of the pin 501 , the pin 502 , the pin 503 and the pin 504 and the rectifier circuit corresponding to the rectifier circuit 510 and the rectifier circuit 540 . In this embodiment, the ballast detection circuit 1590 is coupled between the pin 501 and the rectifier circuit 510 .

The ballast detection circuit 1590 detects the AC drive signal or the signal input through the pin 501, the pin 502, the pin 503 and the pin 504, and judges whether the input signal is provided by the electronic ballast according to the detection result. .

16B is a block diagram of a power module of an LED straight tube lamp according to an embodiment of the present invention. Compared with the embodiment of FIG. 16A , the rectifier circuit 810 shown in FIG. 4C is used instead of the rectifier circuit 540 . The ballast detection circuit 1590 is coupled between the rectifier unit 815 and the terminal conversion circuit 541 . One of the rectification unit 815 and the terminal conversion circuit 541 is coupled to the pin 503 and the pin 504 , and the other is coupled to the rectification output terminal 511 and the rectification output terminal 512 . In this embodiment, the rectifier unit 815 is coupled to the pin 503 and the pin 504 , and the endpoint conversion circuit 541 is coupled to the rectifier output end 511 and the rectifier output end 512 . Similarly, the ballast detection circuit 1590 detects the signal input from the pin 503 or the pin 504, and determines whether it is provided by the electronic ballast according to the frequency of the input signal.

Furthermore, the rectifier circuit 810 can also replace the rectifier circuit 510 instead of the rectifier circuit 540 , and the ballast detection circuit 1590 is coupled between the rectifier unit 815 and the terminal conversion circuit 541 in the rectifier circuit 510 .

16C is a block diagram of a ballast detection circuit according to an embodiment of the present invention. The ballast detection circuit 1590 includes a detection circuit 1590a and a switching circuit 1590b. The switching circuit 1590b is coupled to the switching terminals 1591 and 1592. The detection circuit 1590a is coupled to the detection terminals 1593 and 1594 to detect the signals flowing through the detection terminals 1593 and 1594. Alternatively, the switching terminals 1591 and 1592 are used as detection terminals and the detection terminals 1593 and 1594 are omitted. For example, in some embodiments, the detection circuit 1590a and the switching circuit 1590b are commonly coupled to the switching terminals 1591 and 1592, and the detection circuit 1590a detects the signals flowing through the switching terminals 1591 and 1592. Therefore, the detection terminals 1593 and 1594 are represented by dotted lines in the figure.

16D is a schematic diagram of a ballast detection circuit according to an embodiment of the present invention. The ballast detection circuit 1690 includes a detection circuit 1690 a and a switching circuit 1690 b, which are coupled between the switching terminals 1591 and 1592 . The detection circuit 1690a includes a bidirectional trigger diode 1691 , resistors 1692 and 1696 , and capacitors 1693 , 1697 and 1698 . The switching circuit 1690b includes a triac 1699 and an inductor 1694.

The capacitor 1698 is coupled between the switching terminals 1591 and 1592 for generating a detection voltage in response to the signals flowing through the switching terminals 1591 and 1592 . When the signal is a high frequency signal, the capacitive reactance of the capacitor 1698 is quite low, and the generated detection voltage is quite high. The resistor 1692 and the capacitor 1693 are connected in series with both ends of the capacitor 1698 . The resistor 1692 and the capacitor 1693 connected in series are used to filter the detection voltage generated by the capacitor 1698 and generate the filtered detection voltage at the connection point of the resistor 1692 and the capacitor 1693 . The filtering function of the resistor 1692 and the capacitor 1693 is to filter out the high-frequency noise of the detection voltage, so as to avoid the malfunction of the switching circuit 1690b caused by the high-frequency noise. A resistor 1696 and a capacitor 1697 are connected in series with two ends of the capacitor 1693 for transmitting the filtered detection voltage to one end of the bidirectional trigger diode 1691. The resistor 1696 and the capacitor 1697 simultaneously filter the detected voltage for the second time, so that the filtering effect of the detection circuit 1690a is better. According to different applications and noise filtering requirements, the capacitor 1697 can be omitted, and one end of the bidirectional trigger diode 1691 is coupled to the connection point of the resistor 1692 and the capacitor 1693 through the resistor 1696; One end is directly coupled to the connection point of the resistor 1692 and the capacitor 1693 . Therefore, in the figure, the resistor 1696 and the capacitor 1697 are represented by dotted lines. The other end of the triac 1691 is coupled to the control end of the triac 1699 of the switching circuit 1690b. The bidirectional trigger diode 1691 determines whether to generate the control signal 1695 to trigger the conduction of the triac 1699 according to the received signal level. The first terminal of the triac 1699 is coupled to the switching terminal 1591 , and the second terminal is coupled to the switching terminal 1592 through the inductor 1694 . The function of the inductor 1694 is to protect the triac 1699 from being damaged when the signal flowing through the switching terminals 1591 and 1592 exceeds the maximum switching voltage rise rate, repeated voltage peaks in the off state and the maximum switching current rate of change.

When the signals received by the switching terminals 1591 and 1592 are low frequency AC signals or DC signals, the detection voltage generated by the capacitor 1698 will be high enough to make the bidirectional trigger diode 1691 generate the control signal 1695 to trigger the triac 1699 . At this time, the switching terminals 1591 and 1592 are short-circuited, thereby bypassing the parallel circuits of the switching circuit 1690b, such as the circuit connected between the switching terminals 1591 and 1592, the detection circuit 1690a, the capacitor 1698, and the like.

In some embodiments, when the signals received by the switching terminals 1591 and 1592 are high-frequency AC signals, the detection voltage generated by the capacitor 1698 is not sufficient for the triac 1691 to generate the control signal 1695 to trigger the triac 1699 . At this time, the triac 1699 is turned off, and the high-frequency AC signal is mainly transmitted through the external circuit or the detection circuit 1690a.

Therefore, the ballast detection circuit 1690 can determine whether the input signal is the high-frequency AC signal provided by the electronic ballast, and if so, the high-frequency AC signal will flow through the external circuit or the detection circuit 1690a; otherwise, the external circuit will be bypassed. Or the detection circuit 1690a makes the input signal flow through the switching circuit 1690b.

It is worth noting that the capacitor 1698 can be replaced by a capacitor in an external circuit, for example, at least one capacitor in the embodiment of the terminal conversion circuit shown in FIGS. 5A to 5C . Therefore, the capacitor 1698 can be omitted, so it is represented by a dotted line in the figure.

16E is a schematic diagram of a ballast detection circuit according to an embodiment of the present invention. The ballast detection circuit 1790 includes a detection circuit 1790a and a switching circuit 1790b. The switching circuit 1790b is coupled between the switching terminals 1591 and 1592. The detection circuit 1790a is coupled between the detection terminals 1593 and 1594. The detection circuit 1790a includes mutual inductors 1791 and 1792 , capacitors 1793 and 1796 , a resistor 1794 and a diode 1797 . The switching circuit 1790b includes a switching switch 1799 . In this embodiment, the switch 1799 is a P-type Depletion Mode MOSFET, which is turned off when its gate voltage is higher than a threshold voltage, and turned on when it is lower than the threshold voltage. Pass.

The inductor 1792 is coupled between the detection terminals 1593 and 1594 for mutual inductance to the inductor 1791 according to the current signals flowing through the detection terminals 1593 and 1594, so that the inductor 1791 generates a detection voltage. The level of the detection voltage varies with the frequency of the current signal, and may increase as the frequency increases and decrease as the frequency decreases.

In some embodiments, when the signal is a high frequency signal, the inductive reactance of the inductor 1792 is relatively high, and the mutual inductance to the inductor 1791 generates a relatively high detection voltage. When the signal is a low frequency signal or a DC signal, the inductive reactance of the inductor 1792 is relatively low, and the mutual inductance to the inductor 1791 generates a relatively low detection voltage. One end of the inductor 1791 is grounded. A capacitor 1793 and a resistor 1794 connected in series are connected in parallel with the inductor 1791 . The capacitor 1793 and the resistor 1794 receive the detection voltage generated by the inductor 1791, and perform high-frequency filtering to generate the filtered detection voltage. The filtered detection voltage is charged through the diode 1797 to the capacitor 1796 to generate the control signal 1795 . Since the diode 1797 provides unidirectional charging of the capacitor 1796 , the level of the control signal 1795 generated by the capacitor 1796 is the maximum value of the detection voltage of the inductor 1791 . The capacitor 1796 is coupled to the control terminal of the switch 1799 . The first terminal and the second terminal of the switch 1799 are respectively coupled to the switch terminals 1591 and 1592 .

When the signals received by the detection terminals 1593 and 1594 are low frequency AC signals or DC signals, the control signal 1795 generated by the capacitor 1796 is lower than the threshold voltage of the switch 1799 so that the switch 1799 is turned on. At this time, the switching terminals 1591 and 1592 are short-circuited, and the external circuits connected in parallel by the switching circuit 1790b, such as at least one capacitor in the embodiment of the terminal switching circuit shown in FIG. 5A to FIG. 5C, are bypassed.

When the signals received by the detection terminals 1593 and 1594 are high-frequency AC signals, the control signal 1795 generated by the capacitor 1796 is higher than the threshold voltage of the switch 1799 and the switch 1799 is turned off. At this time, the high-frequency AC signal is mainly transmitted through an external circuit.

Therefore, the ballast detection circuit 1790 can determine whether the input signal is the high-frequency AC signal provided by the electronic ballast, if so, the high-frequency AC signal will flow through the external circuit; otherwise, the external circuit will be bypassed, so that the input signal will flow Via switching circuit 1790b.

Next, an exemplary embodiment of adding a ballast detection circuit to the LED lamp and switching the on (bypass) and off (non-bypass) operations of the circuit will be described. For example, the switching terminals 1591 and 1592 are coupled to a capacitor connected in series with the LED lamp, that is, the signal for driving the LED straight tube lamp also flows through the capacitor. The capacitor can be arranged inside the LED straight tube light in series with the internal circuit or outside the LED straight tube light in series with the LED straight tube light. 3A, 3B or 3D, when the lamp driving circuit 505 does not exist, the AC power supply 508 provides a low-voltage, low-frequency AC driving signal as an external driving signal to drive the LED straight tube lamp 500. At this time, the switching circuit of the ballast detection circuit is turned on, so that the AC driving signal of the AC power source 508 directly drives the internal circuit of the LED straight tube lamp. When the lamp driving circuit 505 exists, the lamp driving circuit 505 generates a high-voltage, high-frequency AC signal as an external driving signal to drive the LED straight lamp 500 . At this time, the switching circuit of the ballast detection circuit is turned off, and the capacitor is connected in series with the equivalent capacitor of the internal circuit of the LED straight tube lamp, thus forming a capacitor voltage divider network. In this way, the partial voltage applied to the internal circuit of the LED straight tube lamp can be lower than the high-voltage, high-frequency AC signal (for example, the partial voltage falls within the range of 100-277V) to avoid damage to the internal circuit due to high voltage. Alternatively, the switching terminals 1591 and 1592 are coupled to the capacitors in the embodiment of the terminal conversion circuit shown in FIGS. 5A to 5C , so that the signal flowing through the half-wave connection point 819 also flows through the capacitors, for example, the capacitors in FIG. 5A 642. Capacitor 842 of FIG. 5C. When the lamp drive circuit 505 generates a high-voltage and high-frequency AC signal input, the switching circuit is turned off, so that the capacitor can achieve the voltage dividing effect; when the low-frequency AC signal of the mains or the DC signal of the battery is input, the switching circuit bypasses the capacitor.

It is worth noting that the switching circuit may include multiple switching components to provide more than two switching terminals to connect multiple capacitors in parallel (for example: capacitors 645 and 646 in FIG. 5A , capacitors 643 , 645 and 646 in FIG. Capacitors 743 and 744 and/or 745 and 746 of 5B, capacitors 843 and 844 of FIG. 5C, capacitors 845 and 846 of FIG. 5C, capacitors 842, 843 and 844 of FIG. 5C capacitors 842, 843, 844, 845 and 846) to bypass multiple capacitors.

In addition, the ballast detection circuit of the present invention can be used in combination with the mode switching circuit shown in FIGS. 11A to 11I . The switching circuit in the ballast detection circuit is replaced by a mode switching circuit. The detection circuit in the ballast detection circuit is coupled to one of the input pin 501, the pin 502, the pin 503 and the pin 504, so as to detect via the pin 501, the pin 502, the pin 503 and the connection. Pin 504 inputs the signal to the LED light. The detection circuit generates a control signal according to whether the signal is a high frequency, a low frequency or a DC signal, that is, according to the frequency of the signal, and switches the circuit to the first mode or the second mode by controlling the mode.

For example, when the signal is a high-frequency signal and is higher than the set mode switching frequency, such as the high-frequency signal provided by the lamp driving circuit 505, the control signal generated by the detection circuit will make the mode switching circuit the second mode, to directly input the filtered signal to the LED module; when the signal is a low frequency or DC signal and is lower than the set mode switching frequency, such as the signal provided by the mains or battery, the control generated by the detection circuit The signal causes the mode switching circuit to be in the first mode, so that the filtered signal is directly input to the driving circuit.

17A is a block diagram of a power module of an LED straight tube lamp according to an embodiment of the present invention. Compared with the embodiment shown in FIG. 14A , the LED straight tube lamp of this embodiment includes a rectifier circuit 510 and a rectifier circuit 540, a filter circuit 520, an LED driving module 530 and two filament simulation circuits 1560, and an auxiliary power module 2510 is added. The auxiliary power module 2510 is coupled between the filter output terminal 521 and the filter output terminal 522 . The auxiliary power module 2510 detects the filtered signal on the filter output terminal 521 and the filter output terminal 522 , and determines whether to provide auxiliary power to the filter output terminal 521 and the filter output terminal 522 according to the detection result. When the filtered signal stops being supplied or the AC level is insufficient, that is, when the driving voltage of the LED module is lower than an auxiliary voltage, the auxiliary power module 2510 provides auxiliary power, so that the LED driving module 530 can continue to emit light. The auxiliary voltage is determined according to an auxiliary power voltage of the auxiliary power module 2510 . The rectifier circuit 540 and the two-filament simulation circuit 1560 can be omitted, and are represented by dotted lines in the figure.

17B is a block diagram of a power module of an LED straight tube lamp according to an embodiment of the present invention. Compared with the embodiment shown in FIG. 17A , the LED straight tube lamp of this embodiment includes a rectifier circuit 510 and a rectifier circuit 540 , a filter circuit 520 , an LED driving module 530 , and two filament simulation circuits 1560 , and the LED driving module 530 further includes a driver Circuit 1530 and LED module 630 . The auxiliary power module 2510 is coupled between the driving output terminals 1521 and 1522 .

The auxiliary power module 2510 detects the driving signals of the driving output terminals 1521 and 1522 , and determines whether to provide auxiliary power to the driving output terminals 1521 and 1522 according to the detection result. When the driving signal stops being provided or the AC level is insufficient, the auxiliary power module 2510 provides auxiliary power, so that the LED module 630 can continue to emit light. The rectifier circuit 540 and the two-filament simulation circuit 1560 can be omitted, and are represented by dotted lines in the figure.

17C is a schematic diagram of an auxiliary power module according to an embodiment of the present invention. The auxiliary power module 2610 includes an energy storage unit 2613 and a voltage detection circuit 2614 . The auxiliary power module 2610 further includes an auxiliary power positive terminal 2611 and an auxiliary power negative terminal 2612 to be coupled to the filtering output terminal 521 and the filtering output terminal 522 or the driving output terminals 1521 and 1522 respectively. The voltage detection circuit 2614 detects the level of the signal on the positive terminal 2611 of the auxiliary power supply and the negative terminal 2612 of the auxiliary power supply to determine whether to release the power of the energy storage unit 2613 through the positive terminal 2611 of the auxiliary power supply and the negative terminal 2612 of the auxiliary power supply.

In this embodiment, the energy storage unit 2613 is a battery or a super capacitor. When the voltage difference between the auxiliary power positive terminal 2611 and the auxiliary power negative terminal 2612 (the driving voltage of the LED module) is higher than the auxiliary voltage of the energy storage unit 2613, the voltage detection circuit 2614 uses the auxiliary power positive terminal 2611 and the auxiliary power negative terminal 2612 The signal above charges the energy storage unit 2613. When the driving voltage is lower than the auxiliary voltage, the energy storage unit 2613 releases the stored energy to the outside through the auxiliary power positive terminal 2611 and the auxiliary power negative terminal 2612.

The voltage detection circuit 2614 includes a diode 2615 , a bipolar junction transistor 2616 and a resistor 2617 . The anode of the diode 2615 is coupled to the anode of the energy storage unit 2613 , and the cathode of the diode 2615 is coupled to the positive terminal 2611 of the auxiliary power supply. The negative terminal of the energy storage unit 2613 is coupled to the negative terminal 2612 of the auxiliary power supply. The collector of the bipolar junction transistor 2616 is coupled to the positive terminal 2611 of the auxiliary power supply, and the emitter is coupled to the positive terminal of the energy storage unit 2613 . One end of the resistor 2617 is coupled to the positive terminal 2611 of the auxiliary power supply, and the other end is coupled to the base of the bipolar junction transistor 2616 . The resistor 2617 turns on the bipolar junction transistor 2616 when the collector of the bipolar junction transistor 2616 is higher than the emitter by a turn-on voltage. When the power supply for driving the LED straight tube lamp is normal, the filtered signal will charge the energy storage unit 2613 through the filter output terminal 521 and the filter output terminal 522 and the conducting bipolar junction transistor 2616, or the driving signal will pass through the drive output terminal 1521. The energy storage unit 2613 is charged with the driving output terminal 1522 and the turned-on bipolar junction transistor 2616 until the collector-emitter voltage difference of the bipolar junction transistor 2616 is equal to or less than the turn-on voltage. When the filtered signal or the driving signal stops being provided or the level is suddenly insufficient, the energy storage unit 2613 provides power to the LED driving module 530 or the LED module 630 through the diode 2615 to maintain light emission.

It is worth noting that, in some embodiments, the highest voltage of the energy storage unit 2613 after charging will be at least lower than the voltage applied to the positive terminal 2611 of the auxiliary power supply and the negative terminal 2612 of the auxiliary power supply by the conduction of the bipolar junction transistor 2616 Voltage. The voltage difference output between the auxiliary power positive terminal 2611 and the auxiliary power negative terminal 2612 is lower than the voltage of the energy storage unit 2613 by a threshold voltage of the diode 2615 . Therefore, when the auxiliary power module 2610 starts to supply power, the voltage applied to the LED module 630 will be lower (approximately equal to the sum of the threshold voltage of the diode 2615 and the turn-on voltage of the bi-junction transistor 2616). In the embodiment shown in FIG. 17B , the brightness of the LED module 630 will be significantly reduced when the auxiliary power module supplies power. In this way, when the auxiliary power supply module is applied to the emergency lighting system or the always-on lighting system, the user can know that the main lighting power supply, such as the mains, is abnormal, and can take necessary preventive measures.

18 is a block diagram of a power module of an LED straight tube lamp according to an embodiment of the present invention. Compared with the foregoing embodiments of the LED straight tube lamp, the driving circuit of the LED straight tube lamp of this embodiment is installed outside the LED straight tube lamp. That is, the LED straight tube lamp 3500 is driven to emit light by the external driving power source 3530 through the external driving terminals 3501 and 3502 . The LED straight tube lamp 3500 only includes the LED module 630 and the current control circuit 3510, but does not include the rectifier circuit, the filter circuit and the drive circuit. In this embodiment, the external driving terminals 3501 and 3502 function as the pins 501 and 502 shown in FIG. 3A and FIG. 3B .

The external driving power source 3530 can be directly connected to the commercial power supply or an electronic ballast to receive the power and convert it into an external driving signal and input the LED straight tube lamp 3500 through the external driving terminals 3501 and 3502 . The external driving signal can be a DC signal, preferably a stable DC current signal. Under normal working conditions, the current control circuit 3510 is in a conducting state, so that the LED module 630 flows through current and emits light. The current control circuit 3510 can also detect the current of the LED module 630 to perform voltage regulation or current regulation control, and has a ripple removal function. Under abnormal working conditions, the current control circuit 3510 is turned off to stop supplying the power of the external driving power supply 3530 to the LED module 630 to enter the protection state.

When the current control circuit 3510 determines that the current of the LED module 630 is lower than the set current value or the lower limit of the set range, the current control circuit 3510 is in a fully conducting state, that is, the impedance of the current control circuit 3510 is reduced to a minimum value.

When the current control circuit 3510 determines that the current of the LED module 630 is higher than the set current value or the upper limit of the set range, the current control circuit 3510 is in a cutoff state, cutting off the power input from the external driving power supply 3530 to the LED straight tube lamp 3500 . In some embodiments, the upper limit of the set range is a value that exceeds the rated current of the LED module 630 by about 30%. In this way, when the driving capability of the external driving power supply 3530 is reduced, the current control circuit 3510 can maintain the brightness of the LED lamp as much as possible. Moreover, when the driving capability of the external driving power supply 3530 is abnormally improved, the current control circuit 3510 can also prevent the LED module 630 from being damaged due to overcurrent, so the current control circuit 3510 has the function of overcurrent protection.

It is worth noting that the external driving power source 3530 can also be a DC voltage signal. Under normal working conditions, the current control circuit 3510 stabilizes the current of the LED module 630 or is in a linear working state (ie, the current of the LED module 630 changes linearly with the level of the DC voltage signal). In order to control the current of the LED module 630 to a certain current value or to be in a linear working state, the higher the DC voltage signal provided by the external driving power supply 3530 is, the higher the voltage across the current control circuit 3510 is, so that the power of the current control circuit 3510 increases. Consumption will also be higher. The current control circuit 3510 may be provided with a temperature sensor. When the DC voltage signal provided by the external driving power supply 3530 is too high, the current control circuit 3510 enters the over-temperature protection, which cuts off the power input of the external driving power supply 3530 to the LED straight tube lamp 3500 . For example, when the temperature sensor detects that the temperature of the current control circuit 3510 exceeds 120°, the current control circuit 3510 enters the over-temperature protection. According to such a design, the current control circuit 3510 can simultaneously have the function of over-temperature or over-voltage protection.

In some embodiments, the length of the lamp cap is shortened due to the structure of an external driving power supply. In order to ensure that the overall length of the LED lamp complies with the regulations of fluorescent lamps, the shortened length of the lamp head is supplemented by the length of the extended lamp tube. Since the length of the lamp tube is extended, lengthen the length of the LED light board accordingly. Under the same lighting conditions, the interval between the LEDs attached to the LED light board can be correspondingly increased. Due to the increased interval, the heat dissipation efficiency of the LED can be improved, the temperature of the LED during operation can be reduced, and the LED straight tube lamp can be extended. life.

The realization of each embodiment of the LED straight tube lamp of the present invention is as described above. It should be noted that, in each embodiment, for the same LED straight tube lamp, it includes “the lamp tube has a structurally reinforced end area”, “the LED lamp board adopts a flexible circuit board”, “in the lamp tube”. The peripheral surface is coated with adhesive film", "the inner peripheral surface of the lamp is coated with a diffuser film", "the light source cover has a diffuser film", "the inner wall of the lamp is coated with a reflective film", "the lamp cap includes the heat transfer part", "the lamp cap includes The features of "magnetic conductive metal sheet", "LED light source with bracket", and "using circuit board components to connect LED light board and power supply" can only be applied singly or integrally in practice, so that only one feature or several features are implemented at the same time.

In addition, regarding "the lamp has a structurally reinforced end area", "the LED lamp board adopts a flexible circuit board", "the inner peripheral surface of the lamp is coated with an adhesive film", "the inner peripheral surface of the lamp is coated with a diffuser film" , "the light source cover has a diffuser film", "the inner wall of the lamp is coated with a reflective film", "the lamp cap includes a heat-conducting part", "the lamp cap includes a magnetically conductive metal sheet", "the LED light source has a bracket", "use circuit board components (including Long circuit board and short circuit board) connect LED light board and power supply", "rectifier circuit", "filter circuit", "drive circuit", "end point conversion circuit", "anti-flicker circuit", "protection circuit", "mode Switching circuit, "overvoltage protection circuit", "ballast detection circuit", "ballast compatible circuit", "filament simulation circuit", "auxiliary power module" and other features, including the implementation of the present invention Any related technical points described in the examples and their variants and any combination thereof.

For example, the feature "the light tube has a structurally strengthened end region" may include "the light tube includes a main body region and a plurality of end regions with a transition region between the end region and the main body region, the transition region connecting the The main body area and the end area, both ends of the transition area are arc-shaped in the cross-sectional view along the axial direction of the lamp tube, each of the end areas is sleeved on a lamp cap, and at least one of the outer ends of the end area is arc-shaped. The diameter is smaller than the outer diameter of the main body area, and the outer diameter of the lamp cap is equal to the outer diameter of the main body area.”

For example, the feature "the LED light board adopts a flexible circuit board" may include "the flexible circuit board and the output end of the power supply are connected by wire bonding or the flexible circuit board and the power supply are connected by wire bonding. Welding between the output ends of the flexible circuit board. In addition, the flexible circuit board includes a stack of a dielectric layer and a circuit layer; The width of the direction to realize the function of the reflective film."

For example, the feature "the inner peripheral surface of the lamp is coated with a diffusion film" may include "the composition of the diffusion coating includes calcium carbonate, calcium halophosphate, and alumina, or any combination thereof, as well as thickeners and ceramic activated carbon. In addition, , the diffusing film can also be a diffusing film and cover the LED light source.”

For example, the feature "the inner wall of the lamp tube is coated with a reflective film" may include "the light source may be disposed on the reflective film, in the opening of the reflective film, or on the side of the reflective film."

For example, the feature "the lamp cap includes a heat-conducting portion" may include "the lamp cap may include an insulating tube, and an accommodation space is formed between the inner peripheral surface of the heat-conducting portion and the outer peripheral surface of the lamp tube, wherein the hot melt adhesive may fill a part of the accommodation space or Fill the accommodating space." The feature "The lamp cap includes a magnetically conductive metal piece" may include "The magnetically conductive metal piece can be circular or non-circular, and the magnetically conductive metal piece can be reduced by providing openings or indentations/embossments. The contact area between the outer peripheral surface of the insulating tube and the inner peripheral surface of the insulating tube. In addition, the support part and the protruding part can also be arranged in the insulating tube to strengthen the support of the magnetic conductive metal piece and reduce the contact area between the magnetic conductive metal piece and the insulating tube. ."

For example, the feature "LED light source has a bracket" may include "the light source includes a bracket with a groove, and an LED chip arranged in the groove; the bracket has a first side walls, and second side walls arranged along the width direction of the lamp tube, and the first side walls are lower than the second side walls.”

For example, the feature "Using circuit board components to connect the LED light board and power supply" may include "The combination of long and short circuit boards has a long circuit board and a short circuit board, and the long circuit board and the short circuit board are attached to each other and fixed by adhesive means. , the short circuit board is located near the periphery of the long circuit board. The short circuit board has a power module, which constitutes the power supply as a whole, and the short circuit board is harder than the long circuit board."

In the design of the power module, the external driving signal can be a low-frequency AC signal (for example, provided by the mains), a high-frequency AC signal (for example, provided by an electronic ballast), or a DC signal (for example, provided by a battery). Provide or external drive power), and can input the LED straight tube light by the drive structure of single-end power supply or the drive structure of double-end power supply. For the drive architecture of the double-ended power supply, only one end of the power supply can be used as a single-ended power supply to receive external drive signals.

When the DC signal is used as the external driving signal, the power module of the LED straight tube lamp can omit the rectifier circuit.

In the design of the rectifier circuit of the power module, there may be a single rectifier circuit or a double rectifier circuit. The first rectifier circuit and the second rectifier circuit in the double rectifier circuit are respectively coupled to the pins arranged on the lamp caps at both ends of the LED straight tube lamp. A single rectifier circuit can be applied to the drive architecture of a single-ended power supply, while a dual rectifier circuit can be applied to the drive architecture of a single-ended power supply and a double-ended power supply. Moreover, when at least one rectifier circuit is configured, it can be applied to the driving environment of low-frequency AC signal, high-frequency AC signal, or DC signal.

The single rectifier circuit may be a half-wave rectifier circuit or a full-wave bridge rectifier circuit. The double rectifier circuit can be a double half-wave rectifier circuit, a double full-wave bridge rectifier circuit, or a combination of a half-wave rectifier circuit and a full-wave bridge rectifier circuit.

In the pin design of the power module, it can be a single-ended double-pin (two pins in total, and no pin at the other end), a single-pin at both ends (two pins in total), and a double-connection at both ends. pin (four pins in total) structure. Under the structure of single-ended double-pin and double-ended single-pin structure, it can be applied to the rectifier circuit design of a single rectifier circuit. Under the structure of two-terminal and two-pin, it can be applied to the rectifier circuit design of the double-rectifier circuit, and use either one of the two-terminal pins or any single-ended two-pin to receive the external driving signal.

In the filter circuit design of the power module, a single capacitor or a π-type filter circuit can be used to filter out the high frequency components in the rectified signal, and provide a low ripple DC signal as the filtered signal. The filter circuit may also include an LC filter circuit to present a high impedance for a specific frequency in order to comply with UL listed current magnitude specifications for a specific frequency. Furthermore, the filter circuit according to some embodiments may further include a filter unit coupled between the pins and the rectifier circuit to reduce electromagnetic interference.

In the design of the LED driving module of the power module, only the LED module or the LED module and the driving circuit may be included. The voltage regulator circuit can also be connected in parallel with the LED driver module to ensure that the voltage on the LED driver module does not overvoltage. The voltage regulator circuit can be a clamp voltage circuit, such as a Zener diode, a bidirectional voltage regulator, and the like. When the rectifier circuit includes a capacitor circuit, a capacitor can be connected between one pin of each lamp cap of the two lamp caps and a pin of the other lamp cap in pairs, so as to divide the voltage with the capacitor circuit as a voltage regulator circuit.

In the design including only the LED driver module, when the high-frequency AC signal is used as the external driving signal, at least one rectifier circuit includes a capacitor circuit (ie, includes more than one capacitor), and the capacitor circuit and the full-wave bridge type in the rectifier circuit Or a half-wave rectifier circuit is connected in series, so that the capacitor circuit is equivalent to an impedance under the high-frequency AC signal, which is used as a current regulating circuit and regulates the current of the LED module. Thereby, when different electronic ballasts provide high-frequency AC signals of different voltages, the current of the LED module can be adjusted within a preset current range without overcurrent. In addition, an additional energy release circuit can be added in parallel with the LED module. After the external drive signal is stopped, the energy release circuit assists in releasing energy from the filter circuit to reduce the resonance effect caused by the filter circuit or other circuits to prevent the LED module from flickering. .

In some embodiments, if an LED module and a driving circuit are included in the LED driving module, the driving circuit may be a boost conversion circuit, a buck conversion circuit, or a buck-boost conversion circuit. The driving circuit is used to stabilize the current of the LED module at the set current value, and the set current value can also be modulated according to an external driving signal. For example, the set current value may increase as the level of the external driving signal increases and decrease as the level of the external driving signal decreases. In addition, an additional mode switch can be added between the LED module and the driving circuit, so that the current is directly input to the LED module by the filter circuit or input to the LED module after passing through the driving circuit.

In addition, an additional protection circuit can be added to protect the LED module. The protection circuit can detect the current and/or voltage of the LED module to correspondingly activate the corresponding overcurrent and/or overvoltage protection.

In the design of the ballast detection circuit of the power module, the ballast detection circuit is connected in parallel with the capacitor that is equivalently connected in series with the LED driver module, and the external driving signal is determined to flow through the capacitor or through the ballast according to the frequency of the external driving signal. Current detection circuit (ie bypass capacitor). The above capacitor may be a capacitor circuit of a rectifier circuit.

In the design of the filament simulation circuit of the power module, it can be a single parallel capacitor and resistor group or two series parallel capacitor and resistor groups or a negative temperature coefficient circuit. The filament simulation circuit is suitable for program-start electronic ballasts, which can avoid the problem of program-start electronic ballasts judging abnormal filaments and improve the compatibility with program-start electronic ballasts. Moreover, the filament simulation circuit hardly affects the compatibility of other electronic ballasts such as Instant Start electronic ballasts and Rapid Start electronic ballasts.

In the design of the ballast compatible circuit of the power module, the ballast compatible circuit can be connected in series with the rectifier circuit or in parallel with the filter circuit and the LED drive module. In the design in series with the rectifier circuit, the initial state of the ballast compatible circuit is off, and it turns on after a set delay time. In the design of the parallel connection with the filter circuit and the LED driver module, the initial state of the ballast compatible circuit is on and off after a set delay time. The ballast compatibility circuit can enable the instant start electronic ballast to start smoothly at the initial stage, and improve the compatibility with the instant start electronic ballast. Moreover, the ballast compatible circuit hardly affects the compatibility of other electronic ballasts such as program-start electronic ballasts and quick-start electronic ballasts.

In the design of the auxiliary power module of the power module, the energy storage unit can be a battery or a super capacitor, which is connected in parallel with the LED module. The auxiliary power module is suitable for the design of the LED driver module including the driver circuit.

In the LED module design of the power module, the LED module may include multiple strings of LEDs (ie, a single LED chip, or an LED group composed of multiple LED chips of different colors) connected in parallel with each other, and the LEDs in each LED string may be connected to each other. forming a network connection.

That is to say, the above-mentioned features of the present invention can be arbitrarily arranged and combined to be used for the improvement of LED straight tube lamps, and the above-mentioned embodiments are only described by way of example. The invention is not limited thereto and many modifications are possible without departing from the spirit of the invention and the scope defined by the appended claims.

Claims (40)

1. An LED lamp, one end or both ends of which has a pin, and includes a rectifier circuit, a filter circuit, and an LED drive module coupled to each other, characterized in that, The LED lamp further has a filament simulation circuit, and the filament simulation circuit is coupled to at least one pin at one end of the LED lamp; The LED lamp also has a lamp tube and a lamp plate, and the lamp plate is arranged in the lamp tube; The LED driving module includes an LED unit for emitting light, and the LED unit includes an LED and is disposed on the light board. 2. The LED lamp according to claim 1, characterized in that, The filament simulation circuit includes a capacitor (1663) and a resistor (1665) connected in parallel; Two ends of the capacitor (1663) and the resistor (1665) are respectively coupled to two pins at the same end of the LED lamp. 3. The LED lamp according to claim 1, wherein the filament simulation circuit is coupled to the LED driving module (530) and a pin (501/502/503/504) at one end of the LED lamp ), the filament simulation circuit includes a resistor (1665) and a capacitor (1663) connected in parallel, and a parallel common terminal of the capacitor (1663) and the resistor (1665) is connected to the LED driving module (530). ) coupled. 4. The LED lamp according to claim 3, wherein the rectifier circuit is coupled between the filament simulation circuit and the LED driving module (530). 5. The LED lamp according to claim 1, characterized in that, The filament simulation circuit includes a capacitor (1663) and a resistor (1665) connected in parallel; The capacitor (1663) and the resistor (1665) are coupled between the LED driving module (530) and a pin (501) at one end of the LED lamp; The LED lamp further includes another filament simulation circuit, and the other filament simulation circuit includes another capacitor (1663) and another resistor (1665) connected in parallel; The other capacitor (1663) and the other resistor (1665) are coupled between the LED driving module (530) and the other pin (502) at the end of the LED lamp. 6. The LED lamp according to claim 1, characterized in that, The filament simulation circuit includes a first capacitor (1763), a second capacitor (1764), a first resistor (1765), and a second resistor (1766), wherein: The first capacitor (1763) and the second capacitor (1764) are connected in series between two pins at the same end of the LED lamp; The first resistor (1765) and the second resistor (1766) are also connected in series between the two pins; The connection point of the first capacitor (1763) and the second capacitor (1764) is coupled to the connection point of the first resistor (1765) and the second resistor (1766). 7. The LED lamp according to claim 1, characterized in that, The filament simulation circuit includes a negative temperature coefficient resistor, which is coupled between two pins at the same end of the LED lamp. 8 . The LED lamp according to claim 7 , wherein the resistance value of the filament simulation circuit is 10 ohms or more at 25° C.; when the LED lamp starts normally, the resistance value of the filament simulation circuit drops to 10 ohms or more. 9 . 2 to 10 ohms. 9. The LED lamp according to claim 1, wherein the LED lamp further has a capacitor (925); the capacitor is coupled between the filament simulation circuit and the rectifier circuit, and is connected with the The rectifier circuits are connected in parallel. 10. The LED lamp according to claim 9, wherein the rectifier circuit comprises a first diode (611), a second diode (612), a third diode (613), and a first diode (611) Four diodes (614), wherein the cathode of the second diode (612) and the anode of the fourth diode (614) are coupled to one of the two pins at the same end of the LED lamp (501), the cathode of the first diode (611) and the anode of the third diode (613) are coupled to the other pin (502) of the two pins, the first The diode (611) is connected to the anode of the second diode (612), and the third diode (613) is connected to the cathode of the fourth diode (614). 11 . The LED lamp of claim 9 , wherein two ends of the capacitor are respectively coupled to two pins at the same end of the LED lamp. 12 . 12. The LED lamp according to claim 1, wherein the LED lamp further has a ballast detection circuit (1590, 1690); the ballast detection circuit is coupled to the filament simulation circuit and the between the rectifier circuits and connected in parallel with the rectifier circuit; and the ballast detection circuit is used to detect a pin (501) or another pin (502) at the same end of the LED lamp. The input signal is input to determine whether the ballast detection circuit conducts a current generated by the signal. 13. The LED lamp of claim 12, wherein the ballast detection circuit comprises an inductor (1694) or a switch (1799). 14. The LED lamp of claim 12, wherein the ballast detection circuit comprises an inductor (1694) and a triac (1699) connected in series; and the ballast detection circuit Whether to trigger the triac (1699) to be turned on is determined according to the magnitude of the input signal. 15. The LED lamp according to claim 12, wherein the rectifier circuit comprises a first rectifier circuit (510) and a second rectifier circuit (540/810), and the ballast detection circuit is coupled to the Between the first rectifier circuit (510) and the second rectifier circuit (540/810), and one end of the ballast detection circuit is connected to the first rectifier circuit (510), the ballast detection circuit The other end is connected to the second rectifier circuit (540/810). 16. The LED lamp according to claim 1, wherein the LED driving module comprises a driving circuit (1530) and an LED module (630), and the driving circuit is used for power conversion to drive the LED module glow. 17. The LED lamp according to claim 16, wherein the drive circuit comprises a controller (1531) and a conversion circuit (1532); the conversion circuit is coupled to an output end of the filter circuit to receive the filtered According to the control of the controller, the filtered signal is converted into a driving signal and output to drive the LED module. 18 . The LED lamp of claim 16 , wherein the rectifier circuit is used to receive an input signal input from one end or both ends of the LED lamp, and the drive circuit is used to receive the rectified signal. 19 . the input signal, and perform power conversion on the rectified input signal. 19 . The LED lamp of claim 18 , wherein the filter circuit is configured to receive the output of the rectifier circuit so as to generate the rectified input signal. 20 . 20. The LED lamp according to claim 18, wherein the drive circuit comprises a controller (2631) and a conversion circuit (2632); the conversion circuit (2632) comprises a switch circuit (2635) and an energy storage circuit (2638), the energy storage circuit (2638) is coupled to the LED module (630); the controller (2631) is coupled to the output end of the drive circuit, and is used for receiving a current detection signal (S539) , to determine the on and off time of the switch circuit (2635), and then control the drive signal output by the drive circuit; wherein, the current detection signal (S539) represents the current of the energy storage circuit (2638), Or represents the magnitude of the current flowing through the LED module. 21. The LED lamp of claim 20, wherein the energy storage circuit (2638) comprises an inductance, and the driving circuit comprises an inductance, and the inductance of the driving circuit is used to communicate with the energy storage The inductors in the circuit (2638) are mutually inductive to detect current. 22. The LED lamp according to claim 1, wherein the filament simulation circuit is coupled between the LED driving module (530) and at least one pin at one end of the LED lamp, and the filament The simulated circuit includes a resistor (1665) or a capacitor (1663). 23. The LED lamp according to claim 1, characterized in that, the LED lamp further has a terminal conversion circuit (541), and the terminal conversion circuit is coupled to the LED driving module (530) and the LED lamp between two pins on the same end. 24. The LED lamp of claim 23, wherein the terminal conversion circuit comprises a capacitor and a resistor connected in parallel. 25. The LED lamp according to claim 23 or 24, wherein the rectifier circuit comprises the terminal conversion circuit, or is coupled between the terminal conversion circuit and the LED driving module (530). 26. The LED lamp according to claim 1, characterized in that, the filament simulation circuit constitutes a terminal conversion circuit (541), and the filament simulation circuit comprises two resistors connected in series to the same end of the LED lamp. between the pins, and the connection point between the two resistors is coupled to the LED driving module (530). 27. An LED lamp having pins at one or both ends, and comprising a rectifier circuit, a filter circuit, and an LED module (630) coupled to each other, characterized in that, The LED lamp also has a lamp tube and a lamp plate, and the lamp plate is arranged in the lamp tube; The LED module includes an LED unit for emitting light, the LED unit includes an LED and is disposed on the light board; The LED lamp also has a capacitor and another capacitor, the capacitor is coupled to at least one pin (501/502) at one end of the LED lamp, and the other capacitor is coupled to at least one pin (501/502) at the other end of the LED lamp One pin (503/504); The rectifier circuit is coupled between the capacitor (1663/642/743/843/1763/825) and the LED module (630), and is also coupled to the other capacitor and the LED module (630) ), the rectifier circuit is used to rectify the signal input from one end or both ends of the LED lamp; The filter circuit is coupled between the rectifier circuit and the LED module (630), and is used for filtering the signal from the rectifier circuit. 28. The LED lamp according to claim 27, wherein the capacitor (1663/1763) and another capacitor (1663/1763) are used as a filament simulation circuit, and the filament simulation circuit is coupled to the LED between the module (630) and a pin (501/502/503/504) at one end of the LED lamp. 29. The LED lamp of claim 28, wherein the filament simulation circuit comprises the capacitor (1663/1763) and the resistor (1665/1765) connected in parallel. 30. The LED lamp of claim 29, wherein two ends of the capacitor (1663/1763) and the resistor (1665/1765) are respectively coupled to two pins at the same end of the LED lamp. 31. The LED lamp according to claim 27, wherein the capacitor (642/743/843) and another capacitor (642/743/843) are used as a terminal conversion circuit (541) or have a current limiting function . 32. The LED lamp according to claim 27, characterized in that the LED lamp further has an impedance element (828), the impedance element (828) being connected in parallel with the capacitor (825) or another capacitor (825) between a pin (501/502/503/504) at one end of the LED lamp and the rectifier circuit (510/540). 33. An LED lamp having pins at one or both ends, and comprising a rectifier circuit, a filter circuit, and an LED module (630) coupled to each other, characterized in that, The LED lamp also has a lamp tube and a lamp plate, and the lamp plate is arranged in the lamp tube; The LED module (630) includes an LED unit for lighting, the LED unit includes an LED and is disposed on the light board; The LED lamp further has a current limiting circuit, and the current limiting circuit is coupled to a pin (501/502) at one end of the LED lamp and is used to limit the current flowing through the LED lamp; The rectifying circuit is coupled to the current limiting circuit and is used for rectifying the signal input from one end or both ends of the LED lamp; The filter circuit is coupled between the rectifier circuit and the LED module (630), and is used for filtering the signal from the rectifier circuit; The LED lamp also has a first filament simulation circuit and a second filament simulation circuit, the first filament simulation circuit is coupled to a pin (501/502) at one end of the LED lamp, and the second filament simulation circuit is coupled to The pin (503/504) connected to the other end of the LED light. 34. The LED lamp of claim 33, wherein the rectifier circuit comprises a first rectifier circuit (510) and a second rectifier circuit (540), the first rectifier circuit (510) comprising or coupled to In the current limiting circuit, the second rectifier circuit (540) is coupled between the LED module (630) and the second filament simulation circuit. 35. The LED lamp of claim 33, wherein the first filament simulation circuit comprises an impedance element coupled between two pins (501, 502) at one end of the LED lamp; the second filament The simulation circuit includes an impedance element coupled between two pins (503, 504) at the other end of the LED lamp. 36. An LED lamp having pins at one end or both ends, and comprising a first rectifier circuit (510), a second rectifier circuit (540), a filter circuit, and an LED module (630) coupled to each other, wherein is, The LED lamp also has a lamp tube and a lamp plate, and the lamp plate is arranged in the lamp tube; The LED module (630) includes an LED unit (632/732) for lighting, the LED unit (632/732) includes an LED and is disposed on the light board; The first rectifier circuit (510) is coupled to the pin at one end of the LED lamp and includes a diode, and the second rectifier circuit (540) is coupled to the pin (503) at the other end of the LED lamp and includes two diodes (711, 712; 811, 812), the connection points between the two diodes of the second rectifier circuit (540) are connected to the anodes and cathodes of the two diodes respectively; The first rectifier circuit (510) and the second rectifier circuit (540) are used for rectifying the signal input from one end or both ends of the LED lamp; The filter circuit is coupled between the rectifier circuit and the LED module (630), and is used for filtering the signal from the rectifier circuit; The LED lamp also has an EMI reducing element, which is coupled between a pin (503) at the other end of the LED lamp and a connection point between two diodes of the second rectifier circuit (540). 37. The LED lamp of claim 36, wherein the EMI reducing element comprises a capacitor (1663/1763/1764) and acts as a filament emulation circuit. 38. The LED lamp according to claim 36, wherein the EMI reducing element (642/743/744/843/844/842) belongs to a terminal conversion circuit (541) and has a current limiting function. 39. The LED lamp according to claim 36, wherein the filter circuit comprises a capacitor (625) and is connected in parallel with the LED unit (632/732), and is coupled to the second rectifier circuit (540) ) between the anode of one (811) and the cathode of the other (812). 40. The LED lamp according to claim 36, wherein the first rectifier circuit (510) comprises a first diode (611), a second diode (612), a third diode ( 613), and a fourth diode (614), wherein the cathode of the second diode (612) and the anode of the fourth diode (614) are coupled to two terminals of one end of the LED lamp One of the pins (501), the cathode of the first diode (611) and the anode of the third diode (613) are coupled to the other pin (502) of the two pins of the end ), the first diode (611) is connected to the anode of the second diode (612), and the third diode (613) is connected to the cathode of the fourth diode (614) .