CN115589653A - Multi-path parallel LED constant current driving circuit - Google Patents
Multi-path parallel LED constant current driving circuit Download PDFInfo
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- CN115589653A CN115589653A CN202211330974.7A CN202211330974A CN115589653A CN 115589653 A CN115589653 A CN 115589653A CN 202211330974 A CN202211330974 A CN 202211330974A CN 115589653 A CN115589653 A CN 115589653A
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Abstract
The invention discloses a multi-path parallel LED constant current drive circuit, which comprises: steady voltage driver, constant current drive circuit and LED banks specifically do: the output end of the voltage stabilizing driver is connected with the multi-path constant current driving circuit in parallel; the output end of each constant current driving circuit is connected with one LED lamp set; the LED lamp group comprises a plurality of LED diodes with sequentially connected positive and negative electrodes; the cathode of the last LED diode in each LED lamp group is grounded through the first MOS tube. This application is by steady voltage driver steady voltage back, provides constant current drive LED banks through constant current drive circuit, for LED banks work provides stable operating voltage and operating current, the production debugging is simple reliable. The output end of the voltage stabilizing driver is connected with the multiple paths of constant current driving circuits in parallel, each constant current driving circuit is connected with one lamp group, a plurality of LED lamp groups can be driven simultaneously, the circuit structure is simple, the cost of used components is low, and the circuit working efficiency is high.
Description
Technical Field
The invention relates to the technical field of circuits, in particular to an LED constant current driving circuit.
Background
In lighting applications, the light emitting diode LED is considered to be one of the most potential light sources at present because of its characteristics of high luminous efficiency, long life, high brightness, energy saving, environmental protection, durability, and the like. The LED is used as a constant-current working load, the requirement on working voltage is harsh, and the LED works abnormally when the voltage is too high or too low, so that the reliability of the LED is directly influenced by the power supply quality of the power supply voltage. The types of the driving circuit applied to the LED light source at present include a switch type constant current source drive, a DC-DC linear constant current source drive, a DC low-voltage drive and the like.
Direct current voltage drive such as lithium battery power supply, lead-acid battery power supply, direct current power supply and the like adopts a voltage reduction constant current technology to drive the LED, and has the advantages of low power consumption, high efficiency, small unit power volume, light weight and the like. However, the working requirement of the voltage-reducing constant current output circuit is that the input voltage is higher than the sum of the voltages of the LED lamp groups, and when the input voltage is lower than the sum of the voltages of the LED lamp groups, the voltage-reducing constant current circuit cannot output constant current to ensure the constant current work of the LED, so that the output luminous flux of the LED is reduced, and the LED cannot work at full load, so that the limitation exists. And most of the constant current circuits can only drive one string of LED light sources at the same time, and if an integrated circuit module for simultaneously driving multiple paths of LED light source outputs is required, the circuit structure is complex and the switch debugging difficulty is high.
Disclosure of Invention
The application provides a LED constant current drive circuit that multichannel is parallelly connected can realize driving a plurality of LED banks simultaneously under simple circuit structure, and the debugging of production is simple reliable.
In a first aspect, the present application provides a multi-path parallel LED constant current driving circuit, including: steady voltage driver, constant current drive circuit and LED banks specifically are:
the output end of the voltage stabilizing driver is connected with the plurality of paths of constant current driving circuits which are connected in parallel;
the output end of each constant current driving circuit is connected with one LED lamp group; the LED lamp bank comprises a plurality of LED diodes of which the positive electrodes and the negative electrodes are sequentially connected, and the positive electrode of the first LED diode in the LED lamp bank is connected with the output end of the constant current driving circuit;
and the cathode of the last LED diode in each LED lamp group is grounded through the first MOS tube.
The application provides LED constant current drive circuit that multichannel is parallelly connected, provides the steady voltage that LED banks voltage drop needs by the steady voltage driver after, provides the constant current drive LED banks through constant current drive circuit, can provide stable operating voltage and operating current for LED banks work, and the production debugging is simple reliable. The output end of the voltage stabilizing driver is connected with the multiple paths of constant current driving circuits in parallel, each constant current driving circuit is connected with one LED lamp set, multiple groups of LED lamp sets can be driven simultaneously, the circuit structure is simple, the cost of used components is low, and the circuit working efficiency is high. And the first MOS tube adopts an NMOS tube for dimming, and can support a PWM modulation signal with high refresh frequency. The linear constant current driving circuit formed by the triode and the resistor device can improve the linearity of a PWM (pulse-width modulation) signal, thereby improving the dimming precision of the LED lamp bank.
In one implementation manner, the negative electrode of the last LED diode in each LED lamp set is grounded through a first MOS transistor, specifically:
the cathode of the last LED diode in each LED lamp group is connected with the drain electrode of the first MOS tube;
the grid electrode of the first MOS tube is connected with the PWM signal and the first end of the first resistor;
the source electrode of the first MOS tube and the second end of the first resistor are connected;
and the source electrode of the first MOS tube is grounded.
In one implementation manner, each of the constant current driving circuits includes a first triode, a second resistor, a third resistor, a fourth resistor, and a fifth resistor, and specifically includes:
first ends of the second resistor and the third resistor are connected with an output end of the voltage stabilizing driver;
the second end of the second resistor is connected with the base electrode of the first triode and the collector electrode of the second triode;
the second end of the third resistor is connected with the collector of the first triode;
the emitting electrode of the first triode is connected with the base electrode of the second triode and the first end of the fourth resistor;
an emitting electrode of the second triode is connected with a first end of the fifth resistor, a second end of the fourth resistor and the anode of a first LED diode in the LED lamp bank;
and the second end of the fifth resistor is grounded.
In one implementation, the regulated drive is of the type AC-DC regulated drive or DC-DC regulated drive;
the first MOS tube is an NMOS tube.
In one implementation, the type of the regulated driver is an AC-DC regulated driver or a DC-DC regulated driver;
the first MOS tube is an NMOS tube.
In one implementation, the second resistor is a current limiting resistor, and the fourth resistor is a current sampling resistor.
Drawings
Fig. 1 is a schematic connection relationship diagram of a multi-path parallel LED constant current driving circuit according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
The terms "first" and "second," and the like in the description and claims of this application and in the drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
Example 1
Referring to fig. 1, fig. 1 is a schematic connection relationship diagram of a multi-path parallel LED constant current driving circuit according to an embodiment of the present invention. The embodiment of the invention provides a multi-path parallel LED constant current driving circuit, which comprises: steady voltage driver, constant current drive circuit and LED banks specifically are:
the output end of the voltage stabilizing driver is connected with the plurality of paths of constant current driving circuits which are connected in parallel;
the output end of each constant current driving circuit is connected with one LED lamp group; the LED lamp bank comprises a plurality of LED diodes of which the positive electrodes and the negative electrodes are sequentially connected, and the positive electrode of the first LED diode in the LED lamp bank is connected with the output end of the constant current driving circuit;
and the cathode of the last LED in each LED lamp bank is grounded through the first MOS tube.
Preferably, in the embodiment of the present invention, an output terminal of a voltage regulator driver is connected to a three-way parallel structure, where each of the three-way parallel structure includes a constant current driving circuit and an LED lamp group, and each of the lamp groups includes five LED diodes whose positive and negative electrodes are sequentially connected. In the embodiment of the invention, the voltage stabilizing driver provides the stabilizing voltage VCC which is close to the voltage drop Vf of the LED lamp group, and the constant current driving circuit provides the constant current to drive the LED lamp group connected with the constant current driving circuit.
In one embodiment, the negative electrode of the last LED diode in each LED lamp set is grounded through a first MOS transistor, specifically: the cathode of the last LED diode in each LED lamp group is connected with the drain electrode of the first MOS tube Q3; the grid electrode of the first MOS tube Q3 is connected with a PWM (pulse-width modulation) signal and the first end of a first resistor R5; the source electrode of the first MOS transistor Q3 and the second end of the first resistor R5; the source electrode of the first MOS tube Q3 is grounded. As a preferable scheme of the embodiment of the present invention, the embodiment of the present invention further includes that the first MOS transistor is used to turn on and off the output current of each path of the constant current driving circuit, and receives the PWM modulation signal to perform dimming, which can support a PEM modulation signal with a high refresh frequency. Preferably, in the embodiment of the present invention, the first MOS transistor Q3 is an NMOS transistor; the type of the voltage stabilizing driver is an AC-DC voltage stabilizing driver or a DC-DC voltage stabilizing driver.
In an embodiment, each of the constant current driving circuits includes a first triode Q1, a second triode Q2, a second resistor R1, a third resistor R2, a fourth resistor R3, and a fifth resistor R4, and specifically: first ends of the second resistor R1 and the third resistor R2 are connected with an output end of the voltage stabilizing driver; the second end of the second resistor R1 is connected with the base electrode of the first triode Q1 and the collector electrode of the second triode Q2; the second end of the third resistor R2 is connected with the collector of the first triode Q1; an emitting electrode of the first triode Q1 is connected with a base electrode of the second triode Q2 and a first end of the fourth resistor R3; an emitting electrode of the second triode Q2 is connected with a first end of the fifth resistor R4, a second end of the fourth resistor R3 and the anode of a first LED diode in the LED lamp set; the second end of the fifth resistor R4 is grounded. In the embodiment of the invention, the first triode Q1 and the second triode Q2 are NPN transistors. The first triode, the second resistor and the fifth resistor form a constant current driving circuit together. The first triode Q1 plays a role in current amplification, the second triode Q2 plays a role in amplifying and feeding back a sampling voltage signal, the sampling voltage signal is converted into a current signal, the current signal is negatively fed back to the base of the first triode Q1 after being amplified, the base input current of the first triode Q1 is reversely inhibited, and therefore the output current of the emitting electrode of the first triode Q1 is controlled. The second resistor R1 is connected with the base of the first triode Q1 and is a current-limiting resistor. Since the voltage Vbe between the base and the emitter of the second transistor Q2 is relatively constant, and Vbe is approximately equal to 0.6V, each constant current driving circuit outputs a constant current I = Vbe/R3. The fourth resistor R3 is a current sampling resistor, and one end of the fourth resistor R3 is respectively connected with the emitting electrode of the first triode Q1 and the base electrode of the second triode Q2. When the voltage V at two ends of the fourth resistor R3 is > = Vbe, the second triode Q2 is turned on, and the input current flowing through the base of the first triode Q1 is reduced, so that the output current I is reduced, and meanwhile, the voltage at two ends of the fourth resistor R3 is reduced, and the current sampling negative feedback effect of the second triode Q2 is reduced, so that the output current of the constant current driving circuit is stabilized at I = Vbe/R3. Preferably, two ends of the third resistor R2 are respectively connected to the output end of the regulator driver and the collector of the first transistor Q1, so as to provide a sufficient voltage difference across the second resistor R1, so that a sufficient bias current can be input to the base of the first transistor Q1. The fifth resistor R4 is a bias current load of the first triode Q1, and when the first MOS transistor Q3 is turned off, provides a bias current Ibe between the base and the emitter of the first triode Q1, so that the first triode Q1 is always in a normal current amplification state to respond to a high-speed switching current.
The embodiment of the invention provides a multi-path parallel LED constant current driving circuit, after a voltage stabilizing driver provides stable voltage required by the voltage drop of an LED lamp group, constant current is provided by a constant current driving circuit to drive the LED lamp group, stable working voltage and working current can be provided for the work of the LED lamp group, and the production and debugging are simple and reliable. The output end of the voltage stabilizing driver is connected with the multiple paths of constant current driving circuits in parallel, each constant current driving circuit is connected with one LED lamp set, multiple groups of LED lamp sets can be driven simultaneously, the circuit structure is simple, the cost of used components is low, and the circuit working efficiency is high. And the first MOS tube adopts an NMOS tube for dimming, and can support a PWM modulation signal with high refresh frequency. The linear constant current driving circuit formed by the triode and the resistor device can improve the linearity of the PWM modulation signal, so that the dimming precision of the LED lamp bank is improved.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (6)
1. A multi-path parallel LED constant current driving circuit is characterized by comprising: steady voltage driver, constant current drive circuit and LED banks specifically do: the output end of the voltage stabilizing driver is connected with the plurality of paths of constant current driving circuits which are connected in parallel;
the output end of each constant current driving circuit is connected with one LED lamp group; the LED lamp bank comprises a plurality of LED diodes of which the positive electrodes and the negative electrodes are sequentially connected, and the positive electrode of the first LED diode in the LED lamp bank is connected with the output end of the constant current driving circuit;
and the cathode of the last LED diode in each LED lamp group is grounded through the first MOS tube.
2. The multi-path parallel LED constant current driving circuit according to claim 1, wherein a cathode of a last LED diode in each LED lamp set is commonly grounded through a first MOS transistor, specifically:
the cathode of the last LED diode in each LED lamp group is connected with the drain electrode of the first MOS tube;
the grid electrode of the first MOS tube is connected with the PWM signal and the first end of the first resistor;
the source electrode of the first MOS tube and the second end of the first resistor are connected;
and the source electrode of the first MOS tube is grounded.
3. The multi-path parallel LED constant current driving circuit as claimed in claim 1, wherein each of the constant current driving circuits comprises a first triode, a second resistor, a third resistor, a fourth resistor and a fifth resistor, and specifically comprises:
first ends of the second resistor and the third resistor are connected with an output end of the voltage stabilizing driver;
the second end of the second resistor is connected with the base electrode of the first triode and the collector electrode of the second triode;
the second end of the third resistor is connected with the collector of the first triode; the emitting electrode of the first triode is connected with the base electrode of the second triode and the first end of the fourth resistor;
an emitting electrode of the second triode is connected with a first end of the fifth resistor, a second end of the fourth resistor and the anode of a first LED diode in the LED lamp bank;
and the second end of the fifth resistor is grounded.
4. The multi-path parallel LED constant current driving circuit as claimed in claim 1,
the type of the voltage stabilizing driver is an AC-DC voltage stabilizing driver or a DC-DC voltage stabilizing driver;
the first MOS tube is an NMOS tube.
5. The multi-path parallel LED constant current driving circuit as claimed in claim 3, wherein the first triode and the second triode are NPN transistors.
6. The multi-path parallel LED constant-current driving circuit as claimed in claim 3, wherein the second resistor is a current-limiting resistor, and the fourth resistor is a current sampling resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211330974.7A CN115589653A (en) | 2022-10-27 | 2022-10-27 | Multi-path parallel LED constant current driving circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211330974.7A CN115589653A (en) | 2022-10-27 | 2022-10-27 | Multi-path parallel LED constant current driving circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2025111990A1 (en) * | 2023-11-30 | 2025-06-05 | 京东方科技集团股份有限公司 | Multi-channel constant-current led drive circuit and backlight structure |
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- 2022-10-27 CN CN202211330974.7A patent/CN115589653A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2025111990A1 (en) * | 2023-11-30 | 2025-06-05 | 京东方科技集团股份有限公司 | Multi-channel constant-current led drive circuit and backlight structure |
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