WO2019196695A1

WO2019196695A1 - Led dimming control circuit

Info

Publication number: WO2019196695A1
Application number: PCT/CN2019/080859
Authority: WO
Inventors: 王宗友; 莫永福
Original assignee: 深圳市崧盛电子股份有限公司
Priority date: 2018-04-13
Filing date: 2019-04-01
Publication date: 2019-10-17
Also published as: CN108449837B; CN108449837A

Abstract

An LED dimming control circuit: in the dimming control circuit, a stabilized voltage source module outputs a reference voltage VDD and a voltage required for dimming to a constant current source module; the stabilized voltage source module outputs the reference voltage VDD to a dimming signal processing module; the constant current source module outputs a constant current to a filter module; a dimming signal input module outputs an original dimming signal to the filter module; the filter module outputs the filtered original dimming signal to the dimming signal processing module; and the dimming signal processing module processes the original dimming signal and outputs a direct current dimming signal. The original dimming signal comprises a resistance dimming signal, a voltage dimming signal, and a PWM dimming signal, the dimming signal input module selecting and outputting one of said signals to the filter module such that the same LED dimming control circuit may output different types of dimming signals according to needs.

Description

LED dimming control circuit

Technical field

The present invention relates to the field of LED driving, and more particularly to an LED dimming control circuit.

Background technique

As a new light source in the 21st century, semiconductor lighting has the advantages of energy saving, environmental protection, long life and easy maintenance. It is an irresistible trend to replace traditional lighting sources such as incandescent lamps and fluorescent lamps with high-power high-brightness light-emitting diodes (LEDs). Due to the nature of the LED itself, it must be powered by a constant current source. In recent years, LED lighting has shown an ever-changing trend, especially in the field of dimming applications. It also has the advantages of continuously adjustable brightness, fast dimming speed, low dimming depth, high dimming accuracy and easy digital control. It is widely used.

Some LED switching power supplies have the problems of high development cost and poor compatibility due to the single dimming method. Users have encountered many problems during the installation and matching process. For example, the corresponding dimming device must be purchased and used. The process is very inconvenient and cannot meet people's application needs.

technical problem

The technical problem to be solved by the present invention is that the above-mentioned LED switching power supply of the prior art has a defect of high development cost and poor compatibility due to the use of a single dimming method, and provides an LED dimming control circuit.

Technical solution

The technical solution adopted by the present invention to solve the technical problem thereof is: constructing an LED dimming control circuit, comprising a dimming signal input module, a filtering module, a voltage stabilizing source module, a constant current source module and a dimming signal processing module;

An input end of the voltage stabilizing source module is connected to a power supply voltage VCC, an output end of the voltage stabilizing source module is connected to the constant current source module, and the voltage stabilizing source module outputs a reference voltage VDD and a voltage required for dimming to the a constant current source module; the regulated source module is connected to and outputs the reference voltage VDD to the dimming signal processing module;

The output end of the constant current source module is connected and outputs a constant current to the filtering module;

The dimming signal input module is connected to and outputs an original dimming signal to the filtering module; an output end of the filtering module is connected to the dimming signal processing module, and the filtered original dimming signal is output to the a dimming signal processing module; the dimming signal processing module processes the original dimming signal, and outputs a DC dimming signal;

The original dimming signal includes a resistance dimming signal, a voltage dimming signal, and a PWM dimming signal, and the dimming signal input module selectively outputs to the filtering module.

Preferably, the LED dimming control circuit of the present invention further includes a dimming control module connected to an output end of the dimming signal processing module, wherein the voltage stabilizing source module is connected to and outputs the reference voltage VDD to the The dimming control module;

The dimming control module is configured to provide a voltage offset when the sampled photovoltage is lower than the set dimming voltage.

Preferably, the LED dimming control circuit of the present invention, the dimming control module comprises a triode Q801, a triode Q802, a resistor R801, a resistor R802, a resistor R803, a resistor R804;

The base of the transistor Q801 is connected to the output end of the dimming signal processing module through the resistor R801, and the base of the transistor Q801 is connected to the emitter of the transistor Q801 through the resistor R802, and the transistor Q801 is The emitter is grounded, and the collector of the transistor Q801 is connected to the base of the transistor Q802;

The base of the transistor Q802 is connected to the emitter of the transistor Q802 by connecting the resistor R803 and the resistor R804 in series. The base of the transistor Q802 is connected to the output end of the voltage regulator module through the resistor R803, and receives the receiver. The reference voltage VDD is formed; the collector of the transistor Q802 is connected to the output of the dimming signal processing module.

Preferably, the LED dimming control circuit of the present invention further includes a first protection module between the constant current source module and the filter module, wherein the first protection module is configured to block the original dimming signal. An abnormal signal flows into the constant current source module;

The first protection module includes a diode D601. The anode of the diode D601 is connected to the output end of the constant current source module, and the cathode of the diode D601 is connected to the input end of the filter module.

Preferably, the LED dimming control circuit of the present invention further includes a second protection module connected to the filter module, an output end of the second protection module is connected to the power supply voltage VCC; and the second protection module is used. And outputting the abnormal voltage to the power supply voltage VCC when the original dimming signal is abnormal, and protecting the dimming signal processing module;

The second protection module includes a diode D701. The anode of the diode D701 is connected to the output end of the filter module, and the cathode of the diode D701 is connected to the power supply voltage VCC.

Preferably, the LED dimming control circuit of the present invention, the dimming signal input module comprises a resistance input circuit, a voltage input circuit, and a PWM input circuit;

The resistor input circuit includes a dimming resistor, one end of the resistor input circuit is grounded, and the other end is connected to an output end of the dimming signal input module for outputting the resistor dimming signal;

One end of the voltage input circuit is grounded, and the other end is connected to an output end of the dimming signal input module for outputting the voltage dimming signal;

One end of the PWM input circuit is grounded, and the other end is connected to an output end of the dimming signal input module for outputting the PWM dimming signal.

Preferably, in the LED dimming control circuit of the present invention, the filtering module includes a resistor R201 and a capacitor C201, and one end of the resistor R201 is respectively connected to an output end of the dimming signal input module and an output of the constant current source module. The other end of the resistor R201 is grounded through the capacitor C201, and the other end of the resistor R201 is connected to the input end of the dimming signal processing module.

Preferably, the LED dimming control circuit of the present invention, the voltage stabilizing source module comprises a reference voltage regulator U301, a triode Q301, a resistor R301, a resistor R302, a resistor R303, a capacitor C301, a capacitor C302;

The collector of the transistor Q301 is connected to the power supply voltage VCC, and the base of the transistor Q301 is connected to the collector of the transistor Q301 through the resistor R301;

The first pin of the reference voltage regulator U301 is connected to the power supply voltage VCC through the capacitor C301, and the first pin of the reference voltage regulator U301 is connected to the emitter of the transistor Q301 through the capacitor C302. The first pin of the reference regulator U301 is grounded;

The second pin of the reference voltage regulator U301 is connected to the base of the transistor Q301;

a third pin of the reference voltage regulator U301 is connected to an emitter of the transistor Q301 through the resistor R302, and a third pin of the reference voltage regulator U301 is connected to the reference voltage regulator through the resistor R303. The first pin of U301.

Preferably, the LED dimming control circuit of the present invention, the constant current source module comprises an operational amplifier U401, a transistor Q401, a resistor R401, a resistor R402, a resistor R403, a resistor R404;

The inverting input terminal of the operational amplifier U401 is connected to the output end of the voltage stabilizing source module through the resistor R401, and the inverting input end of the operational amplifier U401 is connected to the emitter of the triode Q401;

The non-inverting input terminal of the operational amplifier U401 is connected to the output end of the voltage stabilizing source module through the resistor R402, and the non-inverting input terminal of the operational amplifier U401 is grounded through the resistor R403;

The positive pole of the power supply of the operational amplifier U401 is connected to the voltage stabilizing source module, and receives the reference voltage VDD; the negative pole of the power supply of the operational amplifier U401 is grounded;

The output terminal of the operational amplifier U401 is connected to the base of the transistor Q401 through the resistor R404, and the collector of the transistor Q401 is connected to the filter module.

Preferably, in the LED dimming control circuit of the present invention, the dimming signal processing module includes an operational amplifier U501 and a resistor R501, and a non-inverting input terminal of the operational amplifier U501 is connected to an output end of the filtering module, and the operation An inverting input terminal of the amplifier U501 is connected to an output end of the operational amplifier U501;

The power supply negative pole of the operational amplifier U501 is grounded, the positive pole of the power supply of the operational amplifier U501 is connected to the voltage stabilizing source module, and receives the reference voltage VDD;

The output of the operational amplifier U501 outputs the DC dimming signal through the resistor R501.

Beneficial effect

An LED dimming control circuit embodying the present invention has the following beneficial effects: in the dimming control circuit, the voltage stabilizing source module outputs a reference voltage VDD and a voltage required for dimming to the constant current source module; The voltage regulator source module outputs the reference voltage VDD to the dimming signal processing module; the constant current source module outputs a constant current to the filtering module; and the dimming signal input module outputs an original dimming signal to the filtering And the filtering module outputs the filtered original dimming signal to the dimming signal processing module; the dimming signal processing module processes the original dimming signal and outputs a DC dimming signal. The original dimming signal includes a resistance dimming signal, a voltage dimming signal, and a PWM dimming signal, and the dimming signal input module is selectively outputted to the filtering module. By implementing the invention, the same LED dimming control circuit can output different dimming signals according to requirements, and has a simple structure and good compatibility.

DRAWINGS

The present invention will be further described below in conjunction with the accompanying drawings and embodiments, in which:

1 is a schematic structural view of a first embodiment of an LED dimming control circuit according to the present invention;

2 is a schematic structural view of a second embodiment of an LED dimming control circuit according to the present invention;

3 is a schematic structural view of a third embodiment of an LED dimming control circuit according to the present invention;

4 is a circuit diagram of a third embodiment of an LED dimming control circuit of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

For a better understanding of the technical features, objects and effects of the present invention, the embodiments of the present invention are described in detail with reference to the accompanying drawings.

1 is a schematic structural view of a first embodiment of an LED dimming control circuit according to the present invention.

Specifically, the LED dimming control circuit includes a dimming signal input module 101, a filtering module 102, a voltage stabilizing source module 103, a constant current source module 104, and a dimming signal processing module 105, wherein

The input end of the voltage stabilizing source module 103 is connected to the power supply voltage VCC, and the output end of the voltage stabilizing source module 103 is connected to the constant current source module 104, and the voltage stabilizing source module 103 outputs the reference voltage VDD and the voltage required for dimming to the constant current source module 104. The regulated voltage source module 103 connects and outputs the reference voltage VDD to the dimming signal processing module 105.

The output of the constant current source module 104 is connected and outputs a constant current to the filtering module 102.

The dimming signal input module 101 connects and outputs the original dimming signal to the filtering module 102. The output end of the filtering module 102 is connected to the dimming signal processing module 105, and outputs the filtered original dimming signal to the dimming signal processing module 105. The original dimming signal includes a resistance dimming signal, a voltage dimming signal, and a PWM (Pulse Width Modulation) dimming signal, and the dimming signal input module 101 selects an output to the filtering module 102, that is, the original dimming signal can be The resistance dimming signal, or the original dimming signal, may be a voltage dimming signal, or the original dimming signal may be a PWM dimming signal. In this embodiment, the original dimming signal can be selected according to requirements, and the dimming signal input module 101 can be compatible with a plurality of dimming control signals, thereby providing a plurality of dimming control modes.

The dimming signal processing module 105 processes the original dimming signal and the reference voltage VDD to output a DC dimming signal. The dimming signal processing module 105 obtains the filtered original dimming signal from the filtering module 102, and the dimming signal processing module 105 functions as a signal follower to ensure that the input signal and the output signal are of the same type, and the dimming signal processing module 105 is used for The output DC dimming signal is limited to a safe voltage range, and the output voltage of the DC dimming signal is adjusted according to the reference voltage to ensure circuit safety. Preferably, when the original dimming signal is a PWM dimming signal, the filtering module 102 filters the PWM dimming signal, converts the PWM dimming signal into a DC signal, and then processes the dimming signal processing module 105 to output DC. Dimming signal.

2 is a schematic structural view of a second embodiment of an LED dimming control circuit according to the present invention.

On the basis of the first embodiment, the LED dimming control circuit of the embodiment further includes a dimming control module 108 connected to the output end of the dimming signal processing module 105. The voltage stabilizing source module 103 is connected and outputs a reference voltage VDD to the tone. Light control module 108. The dimming control module 108 samples the optical signal from the output end of the dimming signal processing module 105. When the sampling dimming voltage is lower than the set dimming voltage, the dimming control module 108 provides a voltage offset to ensure the minimum dimming current. .

3 is a schematic structural view of a third embodiment of an LED dimming control circuit according to the present invention.

On the basis of the second embodiment, the LED dimming control circuit of the embodiment further includes a first protection module 106 between the constant current source module 104 and the filtering module 102, and the first protection module 106 is configured to block the original dimming. The abnormal signal of the signal flows into the constant current source module 104, thereby protecting the constant current source module 104.

On the basis of the second embodiment, the LED dimming control circuit of the embodiment further includes a second protection module 107 connected to the filter module 102, and the output end of the second protection module 107 is connected to the power supply voltage VCC. The second protection module 107 is configured to output the abnormal voltage to the power supply voltage VCC when the abnormality of the original dimming signal is abnormal, and protect the dimming signal processing module 105.

Optionally, the dimming signal input module 101 in the third embodiment includes a resistance input circuit, a voltage input circuit, and a PWM input circuit, where

a. The resistance input circuit includes a dimming resistor. One end of the resistance input circuit is grounded, and the other end is connected to the output end of the dimming signal input module 101. The constant current source module 104 provides a constant current, and a proportional voltage is generated on the dimming resistor. Resistance dimming signal. The dimming resistor can be a fixed resistor or an adjustable resistor, and the resistor value can be set as needed.

b. The voltage input circuit can generate a voltage signal. One end of the voltage input circuit is grounded, and the other end is connected to the output end of the dimming signal input module 101 for outputting a voltage dimming signal.

c. The PWM input circuit can generate a PWM (Pulse Width Modulation) signal. One end of the PWM input circuit is grounded, and the other end is connected to the output end of the dimming signal input module 101 for outputting a PWM dimming signal.

Optionally, the filtering module 102 in the third embodiment includes a resistor R201 and a capacitor C201. One end of the resistor R201 is respectively connected to the output end of the dimming signal input module 101 and the output end of the constant current source module 104. The other end of the resistor R201 passes through the capacitor. C201 is grounded, and the other end of the resistor R201 is connected to the input end of the dimming signal processing module 105. Resistor R201 and capacitor C201 convert the PWM dimming signal into a DC signal.

Alternatively, the voltage stabilizing source module 103 in the third embodiment includes a reference voltage regulator U301, a triode Q301, a resistor R301, a resistor R302, a resistor R303, a capacitor C301, and a capacitor C302. The collector of the transistor Q301 is connected to the power supply voltage VCC, and the base of the transistor Q301 is connected to the collector of the transistor Q301 through the resistor R301; the first pin of the reference regulator U301 is connected to the power supply voltage VCC through the capacitor C301, and the reference voltage regulator U301 is A pin is connected to the emitter of the transistor Q301 through a capacitor C302, and the first pin of the reference regulator U301 is grounded. The second pin of the reference regulator U301 is connected to the base of the transistor Q301. The third pin of the reference regulator U301 is connected to the emitter of the transistor Q301 through a resistor R302, and the third pin of the reference regulator U301 is connected to the first pin of the reference regulator U301 via a resistor R303. Among them, the resistor R302, the resistor R303 and the transistor Q301 achieve accurate and stable voltage output.

Alternatively, in the third embodiment, the constant current source module 104 includes an operational amplifier U401, a transistor Q401, a resistor R401, a resistor R402, a resistor R403, and a resistor R404. The inverting input terminal of the operational amplifier U401 is connected to the output terminal of the voltage stabilizing source module 103 through a resistor R401, and the inverting input terminal of the operational amplifier U401 is connected to the emitter of the triode Q401. The non-inverting input terminal of the operational amplifier U401 is connected to the output terminal of the voltage stabilizing source module 103 through a resistor R402, and the non-inverting input terminal of the operational amplifier U401 is grounded through a resistor R403. The power supply anode of the operational amplifier U401 is connected to the voltage stabilizing source module 103, and receives the reference voltage VDD; the power supply negative pole of the operational amplifier U401 is grounded. The output terminal of the operational amplifier U401 is connected to the base of the transistor Q401 through a resistor R404, and the collector of the transistor Q401 is connected to the filter module 102. The resistor R402 and the resistor R403 are voltage dividing resistors, and the divided voltage is input to the non-inverting input terminal of the operational amplifier U401; and the operational amplifier U401, the transistor Q401, the resistor R401, and the resistor R404 provide a constant current required for dimming.

Optionally, the dimming signal processing module 105 of the third embodiment includes an operational amplifier U501 and a resistor R501. The non-inverting input terminal of the operational amplifier U501 is connected to the output end of the filtering module 102, and the inverting input terminal of the operational amplifier U501 is connected to the operational amplifier U501. Output. The output end of the operational amplifier U501 is connected to the input end of the dimming signal processing module 105, and the output end of the operational amplifier U501 is connected to the output end of the dimming signal processing module 105 via a resistor R501. The power supply negative pole of the operational amplifier U501 is grounded, and the positive power source of the operational amplifier U501 is connected to the voltage stabilizing source module 103, and receives the reference voltage VDD. The non-inverting input terminal of the operational amplifier U501 receives the filtered original dimming signal and the constant current sent by the filtering module 102, so that when the original dimming signal within the set range is input, the operational amplifier U501 can change according to the original dimming signal. To adjust the output DC dimming signal to achieve the dimming function. Further, the operational amplifier U501 combines the reference voltage outputted by the voltage regulator source module 103 to limit the voltage of the output DC dimming signal to a preset voltage range; that is, the original dimming signal voltage input to the non-inverting input terminal of the operational amplifier U501. When the maximum value is greater than the preset voltage range, the original dimming signal is clamped according to the reference voltage, so that the voltage of the output DC dimming signal is within a preset voltage range. It can be understood that the operational amplifier U501 can limit the resistance dimming signal, the voltage dimming signal, and the PWM dimming signal output by the dimming signal input module 101.

Alternatively, in the third embodiment, the first protection module 106 includes a diode D601. The anode of the diode D601 is connected to the output end of the constant current source module 104, and the cathode of the diode D601 is connected to the input end of the filter module 102.

Alternatively, in the third embodiment, the second protection module 107 includes a diode D701, the anode of the diode D701 is connected to the output end of the filter module 102, and the cathode of the diode D701 is connected to the power supply voltage VCC.

Alternatively, the dimming control module 108 in the third embodiment includes a triode Q801, a triode Q802, a resistor R801, a resistor R802, a resistor R803, and a resistor R804. The base of the transistor Q801 is connected to the output end of the filter module 102 through a resistor R801. The base of the transistor Q801 is connected to the emitter of the transistor Q801 through a resistor R802. The emitter of the transistor Q801 is grounded, and the collector of the transistor Q801 is connected to the base of the transistor Q802. The base of the transistor Q802 is connected to the emitter of the transistor Q802 through the series resistor R803 and the resistor R804. The base of the transistor Q802 is connected to the output terminal of the voltage regulator module through the resistor R803, and receives the reference voltage VDD; the collector of the transistor Q802 is connected to the dimming signal. The output of the processing module 105. Wherein, the resistor R801 and the resistor R802 are used for sampling the dimming voltage. When the sampling dimming voltage is lower than the set dimming voltage, a voltage offset is provided through the triode Q801, the triode Q802, the resistor R803, and the resistor R804, thereby ensuring dimming. Minimum current.

It can be understood that, based on the circuit diagram provided by the third embodiment, the circuit corresponding to the first protection module 106, the second protection module 107, and the dimming control module 108 is removed, and the circuit diagram of the first embodiment can be obtained. Similarly, on the basis of the circuit diagram provided in the third embodiment, the circuit corresponding to the first protection module 106 and the second protection module 107 is removed, and the circuit diagram of the second embodiment can be obtained. Therefore, the circuit diagram of the first embodiment and the second embodiment will not be described again. In addition, the circuit diagram of the present invention is only a preferred embodiment of the first embodiment, the second embodiment, and the third embodiment, and other circuits are used to implement equivalent functions according to the principles of the first embodiment, the second embodiment, and the third embodiment. It also falls within the scope of protection of the present invention.

By implementing the invention, the same LED dimming control circuit can output different types of dimming signals according to requirements, and has the advantages of simple structure, good compatibility, high reliability and low cost.

The above embodiments are merely illustrative of the technical concept and the features of the present invention. The purpose of the present invention is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention without limiting the scope of the present invention. Equivalent changes and modifications made within the scope of the claims of the present invention should fall within the scope of the appended claims.

Claims

An LED dimming control circuit, comprising: a dimming signal input module (101), a filtering module (102), a voltage stabilizing source module (103), a constant current source module (104), and a dimming signal processing module ( 105);

The input end of the voltage stabilizing source module (103) is connected to the power supply voltage VCC, the output end of the voltage stabilizing source module (103) is connected to the constant current source module (104), and the output of the voltage stabilizing source module (103) a reference voltage VDD and a voltage required for dimming to the constant current source module (104); the regulated source module (103) is connected and outputs the reference voltage VDD to the dimming signal processing module (105);

The output of the constant current source module (104) is connected and outputs a constant current to the filtering module (102);

The dimming signal input module (101) connects and outputs an original dimming signal to the filtering module (102); an output end of the filtering module (102) is connected to the dimming signal processing module (105), and the filtering is performed. The original dimming signal is output to the dimming signal processing module (105); the dimming signal processing module (105) processes the original dimming signal, and outputs a direct dimming signal;

The original dimming signal includes a resistance dimming signal, a voltage dimming signal, and a PWM dimming signal, and the dimming signal input module (101) selectively outputs to the filtering module (102).
The LED dimming control circuit according to claim 1, further comprising a dimming control module (108) connected to an output end of the dimming signal processing module (105), the voltage stabilizing source module ( 103) connecting and outputting the reference voltage VDD to the dimming control module (108);

The dimming control module (108) is configured to provide a voltage offset when the sampled photovoltage is lower than the set dimming voltage.
The LED dimming control circuit according to claim 2, wherein the dimming control module (108) comprises a triode Q801, a triode Q802, a resistor R801, a resistor R802, a resistor R803, and a resistor R804;

The base of the transistor Q801 is connected to the output end of the dimming signal processing module (105) through the resistor R801, and the base of the transistor Q801 is connected to the emitter of the transistor Q801 through the resistor R802. The emitter of the transistor Q801 is grounded, and the collector of the transistor Q801 is connected to the base of the transistor Q802;

The base of the transistor Q802 is connected to the emitter of the transistor Q802 by connecting the resistor R803 and the resistor R804 in series. The base of the transistor Q802 is connected to the output end of the voltage regulator module through the resistor R803, and receives the receiver. The reference voltage VDD is formed; the collector of the transistor Q802 is connected to the output of the dimming signal processing module (105).
The LED dimming control circuit according to claim 1, further comprising a first protection module (106) between the constant current source module (104) and the filtering module (102), the first The protection module (106) is configured to prevent an abnormal signal of the original dimming signal from flowing into the constant current source module (104);

The first protection module (106) includes a diode D601, an anode of the diode D601 is connected to an output end of the constant current source module (104), and a cathode of the diode D601 is connected to an input end of the filter module (102). .
The LED dimming control circuit according to claim 1, further comprising a second protection module (107) connected to said filtering module (102), said output terminal of said second protection module (107) being connected The power supply voltage VCC; the second protection module (107) is configured to output an abnormal voltage to the power supply voltage VCC when the original dimming signal is abnormal, and protect the dimming signal processing module (105);

The second protection module (107) includes a diode D701, an anode of the diode D701 is connected to an output end of the filter module (102), and a cathode of the diode D701 is connected to the power supply voltage VCC.
The LED dimming control circuit according to any one of claims 1 to 5, wherein the dimming signal input module (101) comprises a resistance input circuit, a voltage input circuit, and a PWM input circuit;

The resistor input circuit includes a dimming resistor, one end of the resistor input circuit is grounded, and the other end is connected to an output end of the dimming signal input module (101) for outputting the resistor dimming signal;

One end of the voltage input circuit is grounded, and the other end is connected to an output end of the dimming signal input module (101) for outputting the voltage dimming signal;

One end of the PWM input circuit is grounded, and the other end is connected to an output end of the dimming signal input module (101) for outputting the PWM dimming signal.
The LED dimming control circuit according to any one of claims 1 to 5, wherein the filtering module (102) comprises a resistor R201 and a capacitor C201, and one end of the resistor R201 is respectively connected to the dimming signal input. An output end of the module (101) and an output end of the constant current source module (104); the other end of the resistor R201 is grounded through the capacitor C201, and the other end of the resistor R201 is connected to the dimming signal processing module (105) ) the input.
The LED dimming control circuit according to any one of claims 1 to 5, wherein the voltage stabilizing source module (103) comprises a reference voltage regulator U301, a triode Q301, a resistor R301, a resistor R302, a resistor R303, Capacitor C301, capacitor C302;

The collector of the transistor Q301 is connected to the power supply voltage VCC, and the base of the transistor Q301 is connected to the collector of the transistor Q301 through the resistor R301;

The first pin of the reference voltage regulator U301 is connected to the power supply voltage VCC through the capacitor C301, and the first pin of the reference voltage regulator U301 is connected to the emitter of the transistor Q301 through the capacitor C302. The first pin of the reference regulator U301 is grounded;

The second pin of the reference voltage regulator U301 is connected to the base of the transistor Q301;

a third pin of the reference voltage regulator U301 is connected to an emitter of the transistor Q301 through the resistor R302, and a third pin of the reference voltage regulator U301 is connected to the reference voltage regulator through the resistor R303. The first pin of U301.
The LED dimming control circuit according to any one of claims 1 to 5, wherein the constant current source module (104) comprises an operational amplifier U401, a transistor Q401, a resistor R401, a resistor R402, a resistor R403, and a resistor R404. ;

The inverting input terminal of the operational amplifier U401 is connected to the output end of the voltage stabilizing source module (103) through the resistor R401, and the inverting input end of the operational amplifier U401 is connected to the emitter of the triode Q401;

The non-inverting input terminal of the operational amplifier U401 is connected to the output end of the voltage stabilizing source module (103) through the resistor R402, and the non-inverting input terminal of the operational amplifier U401 is grounded through the resistor R403;

The positive pole of the power supply of the operational amplifier U401 is connected to the voltage stabilizing source module (103), and receives the reference voltage VDD; the negative pole of the power supply of the operational amplifier U401 is grounded;

The output terminal of the operational amplifier U401 is connected to the base of the transistor Q401 through the resistor R404, and the collector of the transistor Q401 is connected to the filter module (102).
The LED dimming control circuit according to any one of claims 1 to 5, wherein the dimming signal processing module (105) comprises an operational amplifier U501 and a resistor R501, and the non-inverting input terminal of the operational amplifier U501 is connected. An output end of the filtering module (102), an inverting input end of the operational amplifier U501 is connected to an output end of the operational amplifier U501;

The power supply negative pole of the operational amplifier U501 is grounded, the positive pole of the power supply of the operational amplifier U501 is connected to the voltage stabilizing source module (103), and receives the reference voltage VDD;

The output of the operational amplifier U501 outputs the DC dimming signal through the resistor R501.