CN107426871B - Signal conversion circuit, dimming LED driving power supply and lamp - Google Patents
Signal conversion circuit, dimming LED driving power supply and lamp Download PDFInfo
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- CN107426871B CN107426871B CN201710661035.3A CN201710661035A CN107426871B CN 107426871 B CN107426871 B CN 107426871B CN 201710661035 A CN201710661035 A CN 201710661035A CN 107426871 B CN107426871 B CN 107426871B
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 42
- 239000003990 capacitor Substances 0.000 claims description 20
- 238000007599 discharging Methods 0.000 claims description 15
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 238000005070 sampling Methods 0.000 abstract description 9
- 238000005286 illumination Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 230000008901 benefit Effects 0.000 description 5
- 238000004590 computer program Methods 0.000 description 2
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The invention provides a signal conversion circuit, a dimming LED driving power supply and a lamp, and relates to the field of illumination. The signal conversion circuit comprises a reference source, a PWM acquisition circuit, a push-pull circuit and a charge and discharge circuit, wherein the reference source is used for providing power supply voltage; the PWM acquisition circuit is connected with the PWM output port and used for acquiring PWM signals; the push-pull circuit is connected with the reference source and the PWM acquisition circuit and used for realizing line conversion according to the PWM signal; and the charge and discharge circuit is connected with the push-pull circuit and used for realizing charge or discharge according to the conversion of the push-pull circuit so as to adjust the reference voltage through the PWM signal. The circuit structure of the invention does not adopt a sampling operational amplifier with a complex scheme, so the circuit of the invention is simple and the circuit cost can be effectively reduced.
Description
Technical Field
The invention relates to the field of illumination, in particular to a signal conversion circuit, a dimming LED driving power supply and a lamp.
Background
When the LED dimming driving power supply is used, an external PWM (Pulse Width Modulation) signal needs to be converted into a reference voltage signal of the secondary sampling chip through a signal conversion circuit, so as to change the sampling reference function of the circuit, adjust the output current of the power supply, and achieve the dimming effect.
The existing signal conversion circuit is realized by a sampling operational amplifier. The sampling operational amplifier has a complex scheme, which results in high circuit cost.
Disclosure of Invention
The invention provides a signal conversion circuit, a dimming LED driving power supply and a lamp, and aims to solve the problem of high circuit cost in the prior art.
In particular, the present invention proposes a signal conversion circuit for adjusting a reference voltage by a PWM signal, comprising:
a reference source for providing a supply voltage;
the PWM obtaining circuit is connected with the PWM output port and used for obtaining a PWM signal;
the push-pull circuit is connected with the reference source and the PWM acquisition circuit and used for realizing line conversion according to the PWM signal; and
the charge and discharge circuit is connected with the push-pull circuit and used for realizing charge or discharge according to the conversion of the push-pull circuit;
the PWM output port outputs a square wave with adjustable duty ratio, and the charging and discharging circuit is charged when the square wave is in a high-level section; and when the square wave is in a low-level section, the charging and discharging circuit discharges.
Further, the PWM acquisition circuit includes a first transistor.
Furthermore, the first transistor is an NMOS transistor, a gate of the first transistor is connected to the PWM output port, a drain of the first transistor is connected to the reference source, and a source of the first transistor is grounded.
Further, the PWM obtaining circuit also comprises a pull-up resistor which is connected between the grid of the first transistor and the reference source in parallel,
the pull-up resistor enables the signal conversion circuit to output at full load when the PWM output port is free of PWM signals.
Further, the push-pull circuit includes a second transistor and a third transistor connected in series.
Furthermore, the second transistor and the third transistor are both NMOS transistors, a gate of the second transistor is connected to a drain of the first transistor, a source of the second transistor is grounded, a drain of the second transistor is connected to a source of the third transistor, a gate of the third transistor is connected to a gate of the first transistor, and a drain of the third transistor is connected to a reference voltage.
Furthermore, the charge and discharge circuit comprises a first resistor, a second resistor, a third resistor and a capacitor,
the first resistor is connected between the drain of the third transistor and the reference voltage, one end of the second resistor is connected to a connection point of the drain of the second transistor and the source of the third transistor, the other end of the second resistor is connected with the capacitor, the other end of the capacitor is grounded, and the third resistor is connected in parallel with the capacitor;
when the square wave is in a high-level section, the first transistor is turned on, the second transistor is turned off, the third transistor is turned on, and the reference voltage charges the capacitor through the first resistor and the second resistor;
when the square wave is in a low-level section, the first transistor is turned off, the second transistor is turned on, the third transistor is turned off, and the capacitor discharges through the second resistor and the third resistor.
The invention also provides a dimming LED driving power supply which comprises the signal conversion circuit and a PWF dimming circuit, wherein the PWF dimming circuit is provided with the PWM output port.
The invention also provides a lamp which comprises the dimming LED driving power supply; and
a light source device as a load connected to the dimming LED driving power supply.
According to the signal conversion circuit, the dimming LED driving power supply and the lamp, the PWM signal is obtained through the PWM obtaining circuit, line conversion is achieved through the push-pull circuit according to the PWM signal, charging or discharging is achieved through the charging and discharging circuit, and then the reference voltage is adjusted through the PWM signal. The circuit structure of the invention does not adopt a sampling operational amplifier with a complex scheme, so the circuit of the invention is simple and the circuit cost can be effectively reduced.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic block diagram of a signal conversion circuit according to an embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of a signal conversion circuit according to one embodiment of the present invention;
FIG. 3 is a block schematic diagram of a dimmed LED drive power supply according to one embodiment of the invention;
fig. 4 is a schematic structural block diagram of a lamp according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
Fig. 1 is a schematic configuration block diagram of a signal conversion circuit according to an embodiment of the present invention. A signal conversion circuit 100 for regulating a reference voltage by a PWM signal may generally comprise: reference source VCC, PWM acquisition circuit 10, push-pull circuit 20, and charge/discharge circuit 30. The reference source VCC is used to provide a supply voltage. The PWM acquisition circuit 10 is connected to the PWM output port, and is configured to acquire a PWM signal. The push-pull circuit 20 is connected to the reference source VCC and the PWM acquisition circuit 10, and is configured to implement line switching according to the PWM signal. The charge and discharge circuit 30 is connected to the push-pull circuit 20, and is used for realizing charge or discharge according to the conversion of the push-pull circuit. The PWM output port outputs a square wave with an adjustable duty ratio, and the charging and discharging circuit 30 charges when the square wave is in a high level section; when the square wave is in the low level section, the charge and discharge circuit 30 discharges.
The signal conversion circuit 100 of the present invention obtains the PWM signal through the PWM obtaining circuit 10, performs line conversion according to the PWM signal through the push-pull circuit 20, performs charging or discharging through the charging/discharging circuit 30, and further adjusts the reference voltage through the PWM signal. The circuit structure of the invention does not adopt a sampling operational amplifier with a complex scheme, so the circuit of the invention is simple and the circuit cost can be effectively reduced.
Fig. 2 is a schematic circuit diagram of a signal conversion circuit according to an embodiment of the present invention. In this embodiment, the PWM acquisition circuit 10 includes a first transistor Q3.
Further, the first transistor Q3 is an NMOS transistor, the gate of the first transistor Q3 is connected to the PWM output port, the drain of the first transistor Q3 is connected to the reference source VCC, and the source of the first transistor Q3 is grounded. The PWM signal is inverted by the first transistor Q3 to ensure that the push-pull output through the push-pull circuit is in phase with the PWM signal.
Furthermore, an eighth resistor R8 is connected between the gate of the first transistor Q3 and the PWM output port, and the eighth resistor R8 is a current limiting resistor. Furthermore, a second diode D2 is connected in parallel between the PWM output port and the source of the first transistor Q3, and the second diode D2 is a clamping diode. Furthermore, a fifth resistor R5 is connected between the drain of the first transistor Q3 and the reference source VCC, and the fifth resistor R5 is a current-limiting resistor. A tenth resistor R10 is connected in parallel between the gate of the first transistor Q3 and the source of the first transistor Q3, and the tenth resistor R10 is a discharge resistor between the gate and the source of the first transistor Q3.
Further, the PWM obtaining circuit 10 further includes a pull-up resistor R4 for current limiting, the pull-up resistor R4 is connected in parallel between the gate of the first transistor Q3 and the reference source VCC, and the pull-up resistor R4 enables the signal conversion circuit 100 to output full load when the PWM output port has no PWM signal. Further, a first diode D1 is connected between the pull-up resistor R4 and the gate of the first transistor Q3, and the first diode D1 is a reverse bias prevention diode.
In this embodiment, the push-pull circuit 20 includes a second transistor Q2 and a third transistor Q1 connected in series.
Furthermore, the second transistor Q2 and the third transistor Q1 are both NMOS transistors, the gate of the second transistor Q2 is connected to the drain of the first transistor Q3, the source of the second transistor Q2 is grounded, the drain of the second transistor Q2 is connected to the source of the third transistor Q1, the gate of the third transistor Q1 is connected to the gate of the first transistor Q3, and the drain of the third transistor Q1 is connected to the reference voltage Vref.
Furthermore, a sixth resistor R6 is connected between the gate of the second transistor Q2 and the drain of the first transistor Q3, and the sixth resistor R6 is a current-limiting resistor. A ninth resistor R9 is connected in parallel between the gate of the second transistor Q2 and the source of the second transistor Q2, and the ninth resistor R9 is a discharge resistor between the gate and the source of the second transistor Q3.
Further, the charge/discharge circuit 30 includes a first resistor R1, a second resistor R2, a third resistor R7, and a capacitor C1, the first resistor R1 is connected between the drain of the third transistor Q1 and the reference voltage Vref, one end of the second resistor R2 is connected to a connection point between the drain of the second transistor Q2 and the source of the third transistor Q1, the other end of the second resistor R2 is connected to the capacitor C1, the other end of the capacitor C1 is grounded, and the third resistor R7 is connected in parallel to the capacitor C1.
The first resistor R1, the second resistor R2 and the capacitor C1 form an RC filter circuit, and RC filtering is used for providing a stable reference voltage for a reference and filtering out interference signals.
After the PWM signal output by the PWM output port is inverted through the first transistor Q3, the PWM signal is in phase with the push-pull output of the push-pull circuit, and 0-100% dimming control can be realized through a push-pull circuit formed by the third transistor Q1 and the second transistor Q2. The dimming signal output by the PWM output port is a square wave with an adjustable duty cycle D, and the square wave directly controls the gate of the first transistor Q3. When the voltage is in the square wave high level section, the first transistor Q3 is turned on, the VDS voltage of the first transistor Q3 becomes low, the VGS of the second transistor Q2 becomes low, the second transistor Q2 is turned off, meanwhile, the third transistor Q1 is turned on, and the reference voltage Vref charges the capacitor C1 after passing through the first resistor R1 and the second resistor R2. When in the low level section of the square wave, the first transistor Q3 is turned off, VGS of the second transistor Q2 is turned high, the second transistor Q2 is turned on, and at the same time, the third transistor Q1 is turned off, and the capacitor C1 discharges through the second resistor R2 and the third resistor R7. After the above operation is repeated, the duty ratio D of the PWM input terminal is an adjustable square wave signal, and after passing through the push-pull circuit formed by the third transistor Q1 and the second transistor Q2, the relationship between the voltage Vninv across the capacitor C1 and the PWM dimming signal is: vniv is Vref D, where D is the duty cycle of the PWM signal. Therefore, the signal conversion circuit has the characteristic of high-precision signal conversion.
Fig. 3 is a schematic block diagram of a dimming LED driving power supply according to an embodiment of the present invention. The present invention also provides a dimming LED driving power supply 1, which may generally include the signal conversion circuit 100 and the PWF dimming circuit 200 described in the above embodiments, where the PWF dimming circuit 200 has the PWM output port.
The dimming LED driving power supply comprises all technical characteristics of the signal conversion circuit, so that a PWM signal is obtained through the PWM obtaining circuit, line conversion is realized through the push-pull circuit according to the PWM signal, charging or discharging is realized through the charging and discharging circuit, and the reference voltage is adjusted through the PWM signal. The circuit structure of the invention does not adopt a sampling operational amplifier with a complex scheme, so the circuit of the invention is simple and the circuit cost can be effectively reduced. In addition, the dimming LED driving power supply also has the advantage of high signal conversion precision.
Fig. 4 is a schematic structural block diagram of a lamp according to an embodiment of the present invention. The invention also provides a lamp I, which generally comprises the dimming LED driving power supply 1 in the embodiment and a light source device 2 as a load, wherein the light source device 2 of the load is connected to the dimming LED driving power supply 1.
The lamp comprises all technical characteristics of the signal conversion circuit, so that the PWM signal is obtained through the PWM obtaining circuit, line conversion is realized through the push-pull circuit according to the PWM signal, charging or discharging is realized through the charging and discharging circuit, the reference voltage is adjusted through the PWM signal, and dimming of the lamp is further realized. The circuit structure of the invention does not adopt a sampling operational amplifier with a complex scheme, so the circuit of the invention is simple and the circuit cost can be effectively reduced.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
Those skilled in the art will appreciate that the modules in the device in an embodiment may be adaptively changed and disposed in one or more devices different from the embodiment. The modules or units or components of the embodiments may be combined into one module or unit or component, and furthermore they may be divided into a plurality of sub-modules or sub-units or sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.
The various component embodiments of the invention may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. Those skilled in the art will appreciate that a microprocessor or Digital Signal Processor (DSP) may be used in practice to implement some or all of the functionality of some or all of the components in a light fixture according to embodiments of the present invention. The present invention may also be embodied as apparatus or device programs (e.g., computer programs and computer program products) for performing a portion or all of the methods described herein. Such programs implementing the present invention may be stored on computer-readable media or may be in the form of one or more signals. Such a signal may be downloaded from an internet website or provided on a carrier signal or in any other form.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (7)
1. A signal conversion circuit (100) for regulating a reference voltage by a PWM signal, comprising:
a reference source (VCC) for providing a supply voltage;
the PWM obtaining circuit (10) is connected with the PWM output port and used for obtaining a PWM signal;
the push-pull circuit (20) is connected with the reference source (VCC) and the PWM acquisition circuit (10) and is used for realizing line conversion according to the PWM signal; and
the charging and discharging circuit (30) is connected with the push-pull circuit (20) and is used for realizing charging or discharging according to the conversion of the push-pull circuit;
the PWM output port outputs a square wave with adjustable duty ratio, and the charging and discharging circuit (30) charges when the square wave is in a high-level section; when the square wave is in a low-level section, the charging and discharging circuit (30) discharges;
wherein the PWM acquisition circuit (10) includes a first transistor (Q3), a pull-up resistor (R4), the pull-up resistor (R4) is connected in parallel between the gate of the first transistor (Q3) and the reference source (VCC),
the pull-up resistor (R4) enables the signal conversion circuit to output at full load when the PWM output port is free of PWM signals.
2. The signal converting circuit of claim 1, wherein said first transistor (Q3) is an NMOS transistor, a gate of said first transistor (Q3) is connected to said PWM output port, a drain of said first transistor (Q3) is connected to said reference source (VCC), and a source of said first transistor (Q3) is connected to ground.
3. The signal conversion circuit of claim 2, wherein the push-pull circuit (20) comprises a second transistor (Q2) and a third transistor (Q1) in series.
4. The signal conversion circuit of claim 3, wherein the second transistor (Q2) and the third transistor (Q1) are both NMOS transistors, the gate of the second transistor (Q2) is connected to the drain of the first transistor (Q3), the source of the second transistor (Q2) is grounded, the drain of the second transistor (Q2) is connected to the source of the third transistor (Q1), the gate of the third transistor (Q1) is connected to the gate of the first transistor (Q3), and the drain of the third transistor (Q1) is connected to the reference voltage (Vref).
5. The signal conversion circuit of claim 4, wherein the charge/discharge circuit (30) comprises a first resistor (R1), a second resistor (R2), a third resistor (R7), and a capacitor (C1),
the first resistor (R1) is connected between the drain of the third transistor (Q1) and the reference voltage (Vref), one end of the second resistor (R2) is connected to the connection point of the drain of the second transistor (Q2) and the source of the third transistor (Q1), the other end of the second resistor (R2) is connected to the capacitor (C1), the other end of the capacitor (C1) is grounded, and the third resistor (R7) is connected in parallel to the capacitor (C1);
when the square wave is in a high-level section, the first transistor (Q3) is turned on, the second transistor (Q2) is turned off, the third transistor (Q1) is turned on, and the reference voltage (Vref) charges the capacitor (C1) through the first resistor (R1) and the second resistor (R2);
when the square wave is in a low-level section, the first transistor (Q3) is turned off, the second transistor (Q2) is turned on, the third transistor (Q1) is turned off, and the capacitor (C1) discharges through the second resistor (R2) and the third resistor (R7).
6. A dimmed LED driving power supply (1), comprising a signal conversion circuit (100) according to any one of claims 1 to 5 and a PWF dimming circuit (200) having the PWM output port.
7. A luminaire (I) comprising the dimmed LED drive power supply (1) of claim 6; and
a light source device (2) as a load connected to the dimming LED driving power supply (1).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710661035.3A CN107426871B (en) | 2017-08-04 | 2017-08-04 | Signal conversion circuit, dimming LED driving power supply and lamp |
| PCT/CN2018/098098 WO2019024877A1 (en) | 2017-08-04 | 2018-08-01 | Signal conversion circuit, dimming led driving source and lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710661035.3A CN107426871B (en) | 2017-08-04 | 2017-08-04 | Signal conversion circuit, dimming LED driving power supply and lamp |
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| Publication Number | Publication Date |
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| CN107426871A CN107426871A (en) | 2017-12-01 |
| CN107426871B true CN107426871B (en) | 2020-05-15 |
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| CN201710661035.3A Active CN107426871B (en) | 2017-08-04 | 2017-08-04 | Signal conversion circuit, dimming LED driving power supply and lamp |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019024877A1 (en) * | 2017-08-04 | 2019-02-07 | 苏州欧普照明有限公司 | Signal conversion circuit, dimming led driving source and lamp |
| CN110049596B (en) * | 2019-04-28 | 2024-02-20 | 拓尔微电子股份有限公司 | Pulse input detection circuit for white light LED dimming |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4313065A (en) * | 1978-12-21 | 1982-01-26 | Sony Corporation | Switching circuit with MOS field effect transistor |
| CN202340333U (en) * | 2011-11-10 | 2012-07-18 | 四川九洲光电科技股份有限公司 | PWM (Pulse-Width Modulation) light-adjusting switching circuit for LED (Light Emitting Diode) switching power supply |
| CN207135326U (en) * | 2017-08-04 | 2018-03-23 | 欧普照明股份有限公司 | A kind of signaling conversion circuit, dimming LED (Light Emitting Diode) driving power and light fixture |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10252624A1 (en) * | 2002-11-11 | 2004-05-27 | Conti Temic Microelectronic Gmbh | Circuit arrangement for operating LED(s) e.g. for motor vehicle, has reactants formed by resistance and capacitor connected into circuit between operating voltage and LED |
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2017
- 2017-08-04 CN CN201710661035.3A patent/CN107426871B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4313065A (en) * | 1978-12-21 | 1982-01-26 | Sony Corporation | Switching circuit with MOS field effect transistor |
| CN202340333U (en) * | 2011-11-10 | 2012-07-18 | 四川九洲光电科技股份有限公司 | PWM (Pulse-Width Modulation) light-adjusting switching circuit for LED (Light Emitting Diode) switching power supply |
| CN207135326U (en) * | 2017-08-04 | 2018-03-23 | 欧普照明股份有限公司 | A kind of signaling conversion circuit, dimming LED (Light Emitting Diode) driving power and light fixture |
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| CN107426871A (en) | 2017-12-01 |
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