CN216873427U

CN216873427U - Driving circuit compatible with multiple dimmers

Info

Publication number: CN216873427U
Application number: CN202123423300.5U
Authority: CN
Inventors: 吕景飞; 李阳; 余彬; 陈静安
Original assignee: Zhejiang Yankon Group Co Ltd; Zhejiang Yankon Mega Lighting Co Ltd
Current assignee: Zhejiang Yankon Group Co Ltd; Zhejiang Yankon Mega Lighting Co Ltd
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2022-07-01
Anticipated expiration: 2031-12-31

Abstract

The utility model discloses a driving circuit compatible with various dimmers, which comprises a rectifying filter circuit, a constant current control circuit, a silicon controlled dimming control circuit for controlling the silicon controlled dimmer to carry out analog dimming and a signal processing circuit for controlling the 0-10V dimmer or the PWM dimmer or the resistance dimmer to carry out digital PWM signal dimming, wherein the input end of the rectifying filter circuit is connected with commercial alternating current through the silicon controlled dimmer, the output end of the constant current control circuit is respectively connected with the voltage input end of the constant current control circuit and the input end of the silicon controlled rectifier dimming control circuit, the output end of the constant current control circuit is connected with the LED load, the output end of the silicon controlled rectifier dimming control circuit is connected with the analog dimming input end of the constant current control circuit, the input end of the signal processing circuit is connected with the 0-10V dimmer or the PWM dimmer or the resistance dimmer, and the output end of the signal processing circuit is connected with the digital dimming input end of the constant current control circuit; the circuit is simple, and the dimming precision of 0-10V dimming, PWM dimming and resistance dimming can be improved.

Description

Driving circuit compatible with multiple dimmers

Technical Field

The utility model relates to an LED driving technology, in particular to a driving circuit compatible with various dimmers, which can be compatible with a silicon controlled dimmer, a 0-10V dimmer, a PWM (Pulse Width Modulation) dimmer and a resistance dimmer.

Background

The existing common dimming modes include silicon controlled dimming, 0-10V dimming, PWM dimming, resistance dimming and the like. Most of the current LED driving power supplies can only realize one dimming mode, so that the following two problems occur: on one hand, when the original lamp is replaced, the dimmer is not compatible easily, and a new dimmer needs to be replaced or reinstalled; on the other hand, different LED driving power supplies need to be designed for different dimming modes in the production process, which not only increases the cost, but also backlogs the inventory.

For solving the technical problem, manufacturers design dimming circuits which can be compatible with different dimmers, but most of the dimming circuits are complex in circuit structure or are controlled by a single chip microcomputer, so that the production cost is high.

Disclosure of Invention

The utility model aims to solve the technical problem of providing a driving circuit compatible with various dimmers, which has a simple circuit structure, enables the production cost to be lower and can improve the dimming precision of 0-10V dimming, PWM dimming and resistance dimming.

The technical scheme adopted by the utility model for solving the technical problems is as follows: a drive circuit compatible with multiple dimmers comprises a rectifying and filtering circuit for rectifying mains alternating current into direct current and a constant current control circuit for outputting constant direct current to an LED load, and is characterized in that: the LED dimming circuit also comprises a silicon controlled dimming control circuit for controlling the silicon controlled dimmer to carry out analog dimming and a signal processing circuit for controlling the 0-10V dimmer or the PWM dimmer or the resistance dimmer to carry out digital PWM signal dimming, wherein the input end of the rectifying and filtering circuit is connected with commercial alternating current through the silicon controlled dimmer, the output end of the rectifying and filtering circuit is respectively connected with the voltage input end of the constant current control circuit and the input end of the silicon controlled dimming control circuit, the output end of the constant current control circuit is connected with the LED load, the output end of the silicon controlled dimming control circuit is connected with the analog dimming input end of the constant current control circuit, and the input end of the signal processing circuit is connected with the 0-10V dimmer or the PWM dimmer or the resistance dimmer, the output end of the signal processing circuit is connected with the digital dimming input end of the constant current control circuit.

The silicon controlled rectifier dimming control circuit consists of a dimming detection circuit for detecting the dimming condition of the silicon controlled rectifier dimmer and a current compensation circuit for improving the linearity of silicon controlled rectifier dimming.

The dimming detection circuit comprises a first resistor, a second resistor, a third resistor, a ninth resistor, a first voltage stabilizing diode, a sixth capacitor and a seventh capacitor, one end of the first resistor is connected with the output end of the rectifying and filtering circuit, the other end of the first resistor is connected with one end of the second resistor, the other end of the second resistor is connected with one end of the third resistor, the other end of the third resistor is respectively connected with one end of the ninth resistor, one end of the sixth capacitor and the cathode of the first voltage stabilizing diode, the anode of the first voltage stabilizing diode is respectively connected with one end of the seventh capacitor and the COMP end of the constant current chip in the constant current control circuit, namely the analog dimming input end of the constant current control circuit, the other end of the ninth resistor, the other end of the sixth capacitor and the other end of the seventh capacitor are grounded.

The current compensation circuit comprises a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor and a fourth capacitor, wherein one end of the fourth resistor is connected with the output end of the rectification filter circuit, the other end of the fourth resistor is connected with one end of the fifth resistor, the other end of the fifth resistor is connected with one end of the sixth resistor, the other end of the sixth resistor is respectively connected with one end of the seventh resistor and one end of the fourth capacitor, the other end of the fourth capacitor is grounded, and the other end of the seventh resistor is connected with a COMP end of a constant current chip in the constant current control circuit, namely an analog dimming input end of the constant current control circuit through the fifth capacitor. Because the COMP end of the constant current chip in the constant current control circuit is provided with the dimming detection circuit consisting of the first resistor, the second resistor, the third resistor, the ninth resistor, the first voltage stabilizing diode, the sixth capacitor and the seventh capacitor, when dimming is carried out, the first voltage stabilizing diode is biased in the forward direction, current is pumped out from the COMP end, and certain current is consumed, so that the linearity of silicon controlled rectifier dimming can be improved by arranging the current compensation circuit.

The signal processing circuit is composed of a signal conversion circuit used for converting 0-10V dimming signals or PWM dimming signals or resistance dimming signals into PWM signals and an optocoupler circuit which is used for isolating and transmitting the PWM signals to the PWM end of a constant current chip in the constant current control circuit. The isolation function of the optical coupling circuit is mainly to prevent people from getting an electric shock when contacting the signal conversion circuit.

The signal conversion circuit comprises a fifth inductor, a thirty-fourth resistor, a thirty-fifth resistor, a thirty-sixth resistor, a thirty-seventh resistor, a thirty-eighth resistor, a fifteenth capacitor, a seventh electrolytic capacitor, a twelfth electrode tube, a first thermal protector and a signal processing chip, wherein the 2 nd end and the 3 rd end (the 2 nd end and the 3 rd end are input ends) of the fifth inductor are connected with one of a 0-10V dimmer, a PWM dimmer and a resistance dimmer, the 4 th end (the 4 th end is an output end) of the fifth inductor is connected with one end of the thirty-seventh resistor, the other end of the thirty-seventh resistor is respectively connected with one end of the fifteenth capacitor and the cathode of the twelfth electrode tube, the anode of the twelfth electrode tube is respectively connected with one end of the thirty-eighth resistor and the DIM pin of the signal processing chip, the other end of the thirty-eighth resistor is connected with one end of the first thermal protector, the other end of the first thermal protector is connected with a floating ground, the CLAMP pin of the signal processing chip is connected with one end of the thirty-sixth resistor, the ISET pin of the signal processing chip is connected with one end of the thirty-fifth resistor, the VCC pin of the signal processing chip is respectively connected with the anode of the seventh electrolytic capacitor and one end of the thirty-fourth resistor, the other end of the thirty-fourth resistor is connected with the 1 st pin (the 1 st pin is an input pin) of the optical coupler in the optical coupler circuit, the GND pin of the signal processing chip is connected with the cathode of the seventh electrolytic capacitor, the common connection end of the GND pin and the seventh electrolytic capacitor is connected with the floating ground, the other end of the thirty-fifth resistor, the other end of the thirty-sixth resistor, the other end of the fifteenth capacitor and the 1 st end (the 1 st end is an output end) of the fifth inductor are connected with the floating ground And the OUT pin of the signal processing chip is connected with the 2 nd pin (the 2 nd pin is an input pin) of an optical coupler in the optical coupler circuit. In the signal conversion circuit, the thirty-fifth resistor and the thirty-sixth resistor are arranged to adjust the duty ratio according to the voltage, such as: when a 0-10V dimming mode is adopted, the duty ratio can be set to 10% when the 0-10V dimmer is adjusted to 0V according to the requirements of customers, so that the LED lamp is slightly lightened, and certainly, the duty ratio can also be set to 0, so that the LED lamp is extinguished. The first thermal protector can protect the signal processing chip when the temperature of the signal conversion circuit is too high.

The optical coupler circuit comprises an optical coupler, a second thermal protector and a third voltage stabilizing diode, wherein a 1 st pin of the optical coupler is connected with the other end of a thirty-fourth resistor, a 2 nd pin of the optical coupler is connected with an OUT pin of the signal processing chip, a 3 rd pin (the 3 rd pin is an output pin) of the optical coupler is respectively connected with one end of the second thermal protector and the anode of the third voltage stabilizing diode, the common connecting end of the optical coupler is grounded, a 4 th pin (the 4 th pin is an output pin) of the optical coupler is respectively connected with the other end of the second thermal protector and the cathode of the third voltage stabilizing diode, and the common connecting end of the optical coupler is connected with a PWM end of a constant current chip in the constant current control circuit, namely the digital dimming input end of the constant current control circuit. The opto-coupler circuit can export the PWM signal output to the opto-coupler to the PWM end of constant current chip with signal processing chip to realize that PWM adjusts luminance, specifically: a VCC pin of the signal processing chip is output to the anode of a light emitting diode in the optical coupler, an OUT pin of the signal processing chip is output to the cathode of the light emitting diode in the optical coupler, and when the output is low level, the light emitting diode in the optical coupler is conducted, so that a triode in the optical coupler is conducted and grounded, and the low level is output; when the output is high level, the light emitting diode in the optical coupler is not conducted, so that the triode in the optical coupler is not conducted, and the high level is output.

The model of the constant current chip is AL 1666. Other constant current chips with the same function can also be selected.

The model of the signal processing chip is AL 8116. Other signal processing chips with the same function can also be selected.

The type of the optical coupler is EL 1019.

Compared with the prior art, the utility model has the advantages that:

by arranging the silicon controlled dimming control circuit and the signal processing circuit, the silicon controlled dimmer carries out analog dimming through the silicon controlled dimming control circuit, and the 0-10V dimmer or the PWM dimmer or the resistance dimmer carries out digital PWM signal dimming through the signal processing circuit, so that the circuit structure is simplified, the production cost is low, and the analog dimming and the digital PWM signal dimming can be separately adjusted and can be adjusted simultaneously; in addition, the 0-10V dimmer or the PWM dimmer or the resistance dimmer performs digital PWM signal dimming through the signal processing circuit, and compared with analog dimming, the dimming precision of 0-10V dimming, PWM dimming and resistance dimming can be effectively improved.

Drawings

FIG. 1 is a schematic diagram of a driving circuit according to the present invention;

FIG. 2 is a circuit diagram of a driving circuit according to the present invention;

FIG. 3 is a circuit diagram of a thyristor dimming control circuit in the driving circuit of the present invention;

fig. 4 is a circuit diagram of a signal processing circuit in the driving circuit of the present invention.

Detailed Description

The utility model is described in further detail below with reference to the accompanying examples.

The utility model provides a driving circuit compatible with various dimmers, as shown in figure 1, which comprises a rectifying and filtering circuit 1 for rectifying commercial alternating current into direct current, a constant current control circuit 2 for outputting constant direct current to an LED load 9, a silicon controlled dimming control circuit 3 for controlling a silicon controlled dimmer 51 to perform analog dimming, and a signal processing circuit 4 for controlling a 0-10V dimmer 52 or a PWM dimmer 53 or a resistance dimmer 54 to perform digital PWM signal dimming, wherein the input end of the rectifying and filtering circuit 1 is connected with the commercial alternating current through the silicon controlled dimmer 51, the output end of the rectifying and filtering circuit 1 is respectively connected with the voltage input end of the constant current control circuit 2 and the input end of the silicon controlled dimming control circuit 3, the output end of the constant current control circuit 2 is connected with the LED load 9, the output end of the silicon controlled dimming control circuit 3 is connected with the analog dimming input end of the constant current control circuit 2, the input end of the signal processing circuit 4 is connected with a 0-10V dimmer 52 or a PWM dimmer 53 or a resistance dimmer 54, and the output end of the signal processing circuit 4 is connected with the digital dimming input end of the constant current control circuit 2.

In the present embodiment, as shown in fig. 2 and 3, the thyristor dimming control circuit 3 is composed of a dimming detection circuit for detecting the dimming condition of the thyristor dimmer 51 and a current compensation circuit for improving the linearity of thyristor dimming. The dimming detection circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a ninth resistor R9, a first voltage stabilizing diode ZD1, a sixth capacitor C6 and a seventh capacitor C7, wherein one end of the first resistor R1 is connected with the output end of the rectifying and filtering circuit 1, the other end of the first resistor R1 is connected with one end of the second resistor R2, the other end of the second resistor R2 is connected with one end of the third resistor R3, the other end of the third resistor R3 is respectively connected with one end of the ninth resistor R9, one end of the sixth capacitor C6 and the negative electrode of the first voltage stabilizing diode ZD1, the positive electrode of the first voltage stabilizing diode ZD1 is respectively connected with one end of the seventh capacitor C7 and the COMP end of the constant current chip U3 in the constant current control circuit 2, namely the analog dimming input end of the constant current control circuit 2, and the other end of the ninth resistor R9, the other end of the sixth capacitor ZD 6 and the seventh capacitor C7 are grounded. The current compensation circuit comprises a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7 and a fourth capacitor C4, one end of the fourth resistor R4 is connected with the output end of the rectifying and filtering circuit 1, the other end of the fourth resistor R4 is connected with one end of the fifth resistor R5, the other end of the fifth resistor R5 is connected with one end of the sixth resistor R6, the other end of the sixth resistor R6 is respectively connected with one end of the seventh resistor R7 and one end of the fourth capacitor C4, the other end of the fourth capacitor C4 is grounded, and the other end of the seventh resistor R7 is connected with a COMP end of a constant current chip U3 in the constant current control circuit 2, namely, an analog dimming input end of the constant current control circuit 2 through the fifth capacitor C5. Because the COMP end of the constant current chip U3 in the constant current control circuit 2 is provided with a dimming detection circuit composed of a first resistor R1, a second resistor R2, a third resistor R3, a ninth resistor R9, a first zener diode ZD1, a sixth capacitor C6, and a seventh capacitor C7, when dimming, the first zener diode ZD1 is forward biased, and will draw current from the COMP end to the outside, and will consume a certain current, the current compensation circuit can improve the linearity of silicon controlled rectifier dimming.

In the present embodiment, as shown in fig. 2 and 4, the signal processing circuit 4 is composed of a signal conversion circuit for converting a 0-10V dimming signal or a PWM dimming signal or a resistance dimming signal into a PWM signal, and an optical coupler circuit which is used for isolation and for transmitting the PWM signal to the PWM terminal of the constant current chip U3 in the constant current control circuit 2, and the isolation function of the optical coupler circuit is mainly to prevent a person from getting an electric shock when contacting the signal conversion circuit. The signal conversion circuit comprises a fifth inductor L5, a thirty-fourth resistor R34, a thirty-fifth resistor R35, a thirty-sixth resistor R36, a thirty-seventh resistor R37, a thirty-eighth resistor R38, a fifteenth capacitor C15, a seventh electrolytic capacitor CD7, a twelfth diode D10, a first thermal protector TEM1 and a signal processing chip U2, wherein the 2 nd end and the 3 rd end (the 2 nd end and the 3 rd end are input ends) of the fifth inductor L5 are connected with one of a 0-10V dimmer 52, a PWM dimmer 53 and a resistor dimmer 54, the 4 th end (the 4 th end is an output end) of the fifth inductor L5 is connected with one end of the thirty-seventh resistor R37, the other end of the thirty-seventh resistor R37 is connected with one end of the fifteenth capacitor C15 and the negative electrode of the twelfth diode D10 respectively, the positive electrode of the twelfth diode D828456 is connected with one end of the thirty-fourth end of the eighth resistor R6353 and one end of the signal processing chip U2, the thirty-fourth resistor R867 is connected with the first thermal protector pin 867, the other end of the first thermal protector TEM1 is grounded, the CLAMP pin of the signal processing chip U2 is connected with one end of a thirty-sixth resistor R36, the ISET pin of the signal processing chip U2 is connected with one end of a thirty-fifth resistor R35, the VCC pin of the signal processing chip U2 is connected with the anode of a seventh electrolytic capacitor CD7 and one end of a thirty-fourth resistor R34 respectively, the other end of the thirty-fourth resistor R34 is connected with the 1 st pin (the 1 st pin is an input pin) of an optical coupler U1 in an optical coupler circuit, the GND pin of the signal processing chip U2 is connected with the cathode of a seventh electrolytic capacitor CD7, and the common connection end of the signal processing chip is connected with the ground in a floating manner, the other end of the thirty-fifth resistor R35, the other end of the thirty-sixth resistor R36, the other end of the fifteenth capacitor C15 and the 1 st end (the 1 st end is an output end) of the fifth inductor L5 are connected with the ground in a floating manner, and the OUT pin of the signal processing chip U2 is connected with the 2 nd pin (the 2 nd pin is an input pin) of the optocoupler U1 in the optocoupler circuit. In the signal conversion circuit, the thirty-fifth resistor R35 and the thirty-sixth resistor R36 are arranged to adjust the duty cycle according to the voltage, such as: when the 0-10V dimming mode is adopted, the duty ratio can be set to 10% when the 0-10V dimmer 52 is adjusted to 0V according to the requirements of customers, so that the LED lamp is slightly lightened, and certainly, the duty ratio can also be set to 0, so that the LED lamp is extinguished. The provision of the first thermal protector TEM1 can protect the signal processing chip U2 when the temperature of the signal conversion circuit is too high. The optical coupler circuit comprises an optical coupler U1, a second thermal protector TEM2 and a third voltage-stabilizing diode ZD3, wherein a 1 st pin of the optical coupler U1 is connected with the other end of a thirty-fourth resistor R34, a 2 nd pin of the optical coupler U1 is connected with an OUT pin of a signal processing chip U2, a 3 rd pin (the 3 rd pin is an output pin) of the optical coupler U1 is respectively connected with one end of the second thermal protector TEM2 and the anode of the third voltage-stabilizing diode ZD3, the common connection end of the optical coupler U1 is grounded, a 4 th pin (the 4 th pin is an output pin) of the optical coupler U1 is respectively connected with the other end of the second thermal protector 2 and the cathode of the third voltage-stabilizing diode ZD3, and the common connection end of the optical coupler U1 is connected with the PWM end of a constant current chip U3 in the constant current control circuit 2, namely the digital dimming input end of the constant current control circuit 2. The optocoupler circuit can output the PWM signal output to the optocoupler U1 from the signal processing chip U2 to the PWM end of the constant current chip U3, thereby realizing PWM dimming, specifically: a VCC pin of the signal processing chip U2 is output to an anode of a light emitting diode in the optocoupler U1, an OUT pin of the signal processing chip U2 is output to a cathode of the light emitting diode in the optocoupler U1, and when the output is low level, the light emitting diode in the optocoupler U1 is conducted, so that a triode in the optocoupler U1 is conducted and grounded, and the low level is output; when the output is high level, the light emitting diode in the optocoupler U1 is not conducted, so that the triode in the optocoupler U1 is not conducted, and high level is output.

The model number of the constant current chip U3 is AL1666, and other constant current chips with the same function can be selected; the model of the signal processing chip U2 is AL8116, and other signal processing chips with the same function can be selected; the light coupler U1 is of the type EL 1019.

In specific implementation, the rectifying and filtering circuit 1 adopts an existing circuit, such as the specific circuit shown in fig. 1; the constant current control circuit 2 adopts the existing circuit, such as the specific circuit shown in fig. 1; the first thermal protector TEM1 and the second thermal protector TEM2 employ existing thermal protectors.

The working principle of the driving circuit of the utility model is as follows:

when the thyristor dimmer 51 is not dimming, after passing through the rectifying and filtering circuit 1, one path of commercial alternating current is divided by the first resistor R1, the second resistor R2, the third resistor R3 and the ninth resistor R9 and then output to the cathode of the first zener diode ZD1, and the other path of commercial alternating current is output to the anode of the first zener diode ZD1 through the COMP end of the constant current chip U3, at this time, because the voltage of the cathode side of the first zener diode ZD1 is higher than the voltage of the anode side, the first zener diode ZD1 is conducted from the cathode side to the anode side and enters the COMP end of the constant current chip U3, at this time, the LED load 9 is in the brightest state, as the phase cut-off by the thyristor dimmer 51 is gradually increased with continuous adjustment of the thyristor dimmer 51, the voltage of the cathode side of the first zener diode 1 is gradually decreased, and when the voltage of the cathode side of the first zener diode ZD1 is smaller than the voltage of the anode side, the first zener diode ZD1 is conducted in the forward direction, the COMP terminal voltage of the constant current chip U3 is gradually decreased, and the LED load 9 is in a dimming state.

When the dimming is required to be adjusted by the 0-10V dimmer 52, the PWM dimmer 53 or the resistance dimmer 54, the dimming signal passes through the fifth inductor L5 and is output to the cathode of the twelfth diode D10, meanwhile, the DIM pin of the signal processing chip U2 outputs a current for determining the dimming condition, when the voltage on the anode of the twelfth diode D10 is less than the voltage on the cathode, the twelfth diode D10 is not turned on, 100% of the PWM signal output by the signal processing chip U2 is output to the PWM terminal of the constant current chip U3 through the optocoupler circuit, and the LED load 9 is in the brightest state, when the voltage on the anode of the twelfth diode D10 is greater than the voltage on the cathode, the twelfth diode D10 is turned on, the signal processing chip U2 outputs different PWM duty signals according to the dimming condition, and the signals are output to the PWM end of the constant current chip U3 through the optocoupler circuit, and the LED load 9 is in the dimming state at this time.

Claims

1. A drive circuit compatible with multiple dimmers comprises a rectifying and filtering circuit for rectifying mains alternating current into direct current and a constant current control circuit for outputting constant direct current to an LED load, and is characterized in that: the LED dimming circuit also comprises a silicon controlled dimming control circuit for controlling the silicon controlled dimmer to carry out analog dimming and a signal processing circuit for controlling the 0-10V dimmer or the PWM dimmer or the resistance dimmer to carry out digital PWM signal dimming, wherein the input end of the rectifying and filtering circuit is connected with commercial alternating current through the silicon controlled dimmer, the output end of the rectifying and filtering circuit is respectively connected with the voltage input end of the constant current control circuit and the input end of the silicon controlled dimming control circuit, the output end of the constant current control circuit is connected with the LED load, the output end of the silicon controlled dimming control circuit is connected with the analog dimming input end of the constant current control circuit, and the input end of the signal processing circuit is connected with the 0-10V dimmer or the PWM dimmer or the resistance dimmer, the output end of the signal processing circuit is connected with the digital dimming input end of the constant current control circuit.

2. The driving circuit as claimed in claim 1, wherein the scr dimming control circuit comprises a dimming detection circuit for detecting a dimming condition of the scr dimmer and a current compensation circuit for improving linearity of the scr dimming.

3. The driving circuit according to claim 2, wherein the dimming detection circuit comprises a first resistor, a second resistor, a third resistor, a ninth resistor, a first zener diode, a sixth capacitor, and a seventh capacitor, one end of the first resistor is connected to the output terminal of the rectifying and filtering circuit, the other end of the first resistor is connected to one end of the second resistor, the other end of the second resistor is connected to one end of the third resistor, the other end of the third resistor is connected to one end of the ninth resistor, one end of the sixth capacitor, and the cathode of the first zener diode, the anode of the first zener diode is connected to one end of the seventh capacitor and the COMP terminal of the constant current chip in the constant current control circuit, i.e. the analog dimming input terminal of the constant current control circuit, the other end of the ninth resistor, the other end of the sixth capacitor and the other end of the seventh capacitor are grounded.

4. The driving circuit compatible with multiple dimmers of claim 2 or 3, wherein the current compensation circuit comprises a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, and a fourth capacitor, one end of the fourth resistor is connected with the output end of the rectifying and filtering circuit, the other end of the fourth resistor is connected with one end of the fifth resistor, the other end of the fifth resistor is connected with one end of the sixth resistor, the other end of the sixth resistor is respectively connected with one end of the seventh resistor and one end of the fourth capacitor, the other end of the fourth capacitor is grounded, and the other end of the seventh resistor is connected with a COMP end of a constant current chip in the constant current control circuit, namely an analog dimming input end of the constant current control circuit, through a fifth capacitor.

5. The driving circuit according to claim 1, wherein the signal processing circuit comprises a signal conversion circuit for converting a 0-10V dimming signal or a PWM dimming signal or a resistance dimming signal into a PWM signal, and an optocoupler circuit for isolating and transmitting the PWM signal to a PWM terminal of a constant current chip in the constant current control circuit.

6. The driving circuit of claim 5, wherein the signal conversion circuit comprises a fifth inductor, a thirty-fourth resistor, a thirty-fifth resistor, a thirty-sixth resistor, a thirty-seventh resistor, a thirty-eighth resistor, a fifteenth capacitor, a seventh electrolytic capacitor, a twelfth diode, a first thermal protector, and a signal processing chip, wherein the 2 nd terminal and the 3 rd terminal of the fifth inductor are connected to one of a 0-10V dimmer, a PWM dimmer, and a resistance dimmer, the 4 th terminal of the fifth inductor is connected to one terminal of the thirty-seventh resistor, the other terminal of the thirty-seventh resistor is connected to one terminal of the fifteenth capacitor and the cathode of the twelfth diode, the anode of the twelfth diode is connected to one terminal of the thirty-eighth resistor and the DIM pin of the signal processing chip, the other end of the thirty-eighth resistor is connected with one end of the first thermal protector, the other end of the first thermal protector is connected with a floating ground, a CLAMP pin of the signal processing chip is connected with one end of the thirty-sixth resistor, an ISET pin of the signal processing chip is connected with one end of the thirty-fifth resistor, a VCC pin of the signal processing chip is respectively connected with the anode of the seventh electrolytic capacitor and one end of the thirty-fourth resistor, the other end of the thirty-fourth resistor is connected with the optical coupling circuit, a GND pin of the signal processing chip is connected with the cathode of the seventh electrolytic capacitor, the common connection end of the GND pin and the cathode of the seventh electrolytic capacitor is connected with the floating ground, the other end of the thirty-fifth resistor, the other end of the thirty-sixth resistor, the other end of the fifteenth capacitor and the 1 st end of the fifth inductor are connected with the floating ground, and the OUT pin of the signal processing chip is connected with the optical coupling circuit.

7. The driving circuit according to claim 6, wherein the optocoupler circuit includes an optocoupler, a second thermal protector, and a third zener diode, a 1 st pin of the optocoupler is connected to the other end of the thirty-fourth resistor, a 2 nd pin of the optocoupler is connected to the OUT pin of the signal processing chip, a 3 rd pin of the optocoupler is connected to one end of the second thermal protector and the anode of the third zener diode respectively, and the common connection end of the optocoupler is grounded, a 4 th pin of the optocoupler is connected to the other end of the second thermal protector and the cathode of the third zener diode respectively, and the common connection end of the optocoupler is connected to the PWM end of the constant current chip in the constant current control circuit, that is, the digital dimming input end of the constant current control circuit.

8. A drive circuit compatible with multiple dimmers according to claim 3 or 7, wherein the type of the constant current chip is AL 1666.

9. The driving circuit compatible with multiple dimmers according to claim 6 or 7, wherein the signal processing chip has a model number of AL 8116.

10. A driving circuit compatible with multiple dimmers according to claim 7, wherein the optocoupler is of the type EL 1019.