CN114641109A - A multi-mode dimming circuit and lamp - Google Patents

Abstract

The invention provides a multimode dimming circuit, comprising: the dimming control module is used for receiving a PWM dimming signal or a silicon-controlled dimming signal; when a PWM dimming signal is received, adjusting the current value of the LED lamp panel according to the PWM dimming signal so as to perform PWM dimming; when the silicon controlled rectifier dimming signal is received, the current value of the LED lamp panel is adjusted according to the silicon controlled rectifier dimming signal so as to perform silicon controlled rectifier dimming, so that one driving control is compatible with PWM dimming and silicon controlled rectifier dimming, the multi-mode dimming is integrated, the circuit composition is effectively simplified, and the driving cost and the circuit size of the LED dimming circuit are greatly reduced.

Description

A multi-mode dimming circuit and lamp

technical field

The invention relates to the field of electronic technology, in particular to a multi-mode dimming circuit and a lamp.

Background technique

Existing driver circuits compatible with thyristor dimming and PWM dimming, including rectifier filter modules, PWM dimming drive circuits, thyristor dimming drive circuits, PWM dimming and thyristor dimming drive switching circuits, and PWM Dimming module and power supply circuit. How it works is:

When the AC mains is powered on, the thyristor dimming drive circuit is activated by default, and the LED light board emits different brightnesses according to the current of the thyristor dimming drive circuit; when the PWM dimming module is connected or working, the PWM signal is output. Forcing the thyristor dimming drive circuit to be turned off, the LED light board turns into a current that follows the PWM dimming drive circuit to emit different brightness.

Since two driving circuits are included, the existing circuit structure is extremely complicated, and there are problems of large circuit size and high cost.

SUMMARY OF THE INVENTION

The present invention provides a multi-mode dimming circuit and a lamp to solve the problems of complex circuit structure, large size and high cost of the existing multi-mode dimming circuit.

The present invention is implemented in this way, a multi-mode dimming circuit, comprising:

Rectifier filter module, dimming mode control module, PWM dimming module, PWM dimming module power supply module;

The input end of the rectification filter module is connected to the commercial power, the first output end is connected to the first input end of the dimming mode control module, and the second output end is connected to the input end of the power supply module of the PWM dimming module connect;

The output end of the power supply module of the PWM dimming module is connected with the input end of the PWM dimming module;

The output end of the PWM dimming module is connected to the second input end of the dimming mode control module;

The rectification filter module is used to convert the commercial power into a direct current signal;

The PWM dimming module power supply module is used to convert the direct current signal into an electrical signal suitable for the PWM dimming module, and provide electrical energy to the PWM dimming module;

The PWM dimming module is used for generating a PWM dimming signal, and sending the PWM dimming signal to the dimming mode control module;

Wherein, the dimming mode control module is used to receive a PWM dimming signal or a thyristor dimming signal; when receiving the PWM dimming signal, adjust the current value of the LED light board according to the PWM dimming signal, so as to PWM dimming is performed; when a thyristor dimming signal is received, the current value of the LED lamp panel is adjusted according to the thyristor dimming signal, so as to perform thyristor dimming.

Optionally, the dimming mode control module includes a multi-mode control chip, and the multi-mode control chip is used to adjust the current of the LED light panel according to the PWM dimming signal when receiving the PWM dimming signal. value to perform PWM dimming; when receiving the thyristor dimming signal, adjust the current value of the LED lamp panel according to the thyristor dimming signal to perform thyristor dimming.

Optionally, the dimming mode control module further includes:

a first resistor, a second resistor, a first capacitor, a first inductor, a first diode, a first electrolytic capacitor, a third resistor, a fourth resistor, and a fifth resistor;

a common contact between the first end of the first resistor, the first end of the second resistor and the first end of the first inductor is used as the first input end of the dimming mode control module;

The second end of the first resistor is connected to the first end of the first capacitor, and the second end of the first capacitor is grounded;

The second end of the second resistor is connected to the voltage detection end VS of the multi-mode control chip;

the common contact between the second end of the first inductor and the driving control end DRAIN of the multi-mode control chip is connected to the anode of the first diode;

The common contact between the cathode of the first diode and the first end of the third resistor, the first end of the fourth resistor, and the anode of the first electrolytic capacitor is connected to the anode of the LED lamp board;

The second end of the third resistor is connected to the high-voltage power supply terminal HV of the multi-mode control chip; the second end of the fourth resistor is connected to the overcurrent protection terminal OVP of the multi-mode control chip;

The negative electrode of the first electrolytic capacitor and the negative electrode of the LED lamp board are connected to the first end of the second resistor in common;

The current sampling terminal CS of the multi-mode control chip is grounded through the fifth resistor, the GND terminal of the multi-mode control chip is grounded, and the PWM terminal of the multi-mode control chip is connected to the PWM dimming module.

Optionally, the multi-mode control chip includes:

Chip power supply unit, dimming mode recognition unit, chip constant current control unit;

The first end of the chip power supply unit is used as the high-voltage power supply end HV of the multi-mode control chip, and the second end is connected to the first end of the chip constant current control unit;

The first terminal of the dimming mode identification unit is used as the voltage detection terminal VS of the multi-mode control chip, the second terminal is used as the overcurrent protection terminal OVP of the multi-mode control chip, and the third terminal is used as the multi-mode control chip. The PWM end of the chip, the fourth end is connected to the second end of the constant current control unit of the chip;

The third terminal of the chip constant current control unit is used as the driving control terminal DRAIN of the multi-mode control chip, and the fourth terminal is used as the current sampling terminal CS of the multi-mode control chip;

The chip power supply unit is used to receive the DC signal output by the rectification filter module, and generate and output a reference voltage to the chip constant current control unit;

The chip constant current control unit activates the internal MOS tube according to the reference voltage, and adjusts the conduction angle of the MOS tube according to the maximum conduction control information output by the dimming mode identification unit, so as to adjust the LED lamp panel. current value;

The dimming mode identification unit is used to self-check whether there is a PWM dimming signal at the PWM terminal, and if so, adjust the maximum conduction control information following the PWM dimming signal, and output the maximum conduction control signal to the The chip constant current control unit; if not, detect the voltage waveform of the DC signal through the voltage detection terminal VS, adjust the maximum conduction control information according to the voltage waveform, and output the maximum conduction control signal to the chip constant current control unit.

Optionally, the multi-mode control chip further includes an over-temperature protection unit;

the over-temperature protection unit is connected to the fifth end of the chip constant current control unit;

The over-temperature protection unit is configured to detect the temperature of the NTC multi-mode control chip through a negative temperature coefficient, and when the temperature is greater than or equal to a preset temperature threshold, trigger the under-voltage lockout of the chip power supply unit.

Optionally, the dimming pattern recognition unit is further used for:

If there is a PWM dimming signal at the self-checking PWM terminal, the comparator output of the voltage detection terminal VS is turned off, so that the maximum conduction control information follows the PWM dimming signal.

Optionally, the chip constant current control unit further includes a zero current detector;

The zero current detector is used to control the maximum conduction control information to be output at the maximum value according to the reference voltage when the multi-mode control chip is connected to the commercial power, so that the MOS transistor works in the maximum conduction interval.

Optionally, the PWM dimming signal includes one or any combination of a WIFI signal, a 2.4G signal, a Bluetooth signal, a PLC signal, an RF radio frequency signal, and a voltage-divided dimming signal.

Optionally, the rectifier filter module includes a rectifier circuit, a second capacitor, a second inductor, a sixth resistor, and a third capacitor;

The first end of the rectifier circuit is connected to the live wire of the AC signal, the second end is connected to the ground wire of the AC signal, and the fourth end is grounded;

The common contact between the third end of the rectifier circuit and the first end of the second inductor is used as the first output end of the rectifier filter module; the second end of the second inductor is used as the rectifier filter module the second output terminal of the module;

The first end of the second capacitor and the first end of the sixth resistor are commonly connected to the first end of the second inductor; the second end of the sixth resistor and the first end of the third capacitor are commonly connected to the second end of the second inductor;

The second end of the second capacitor is grounded, and the second end of the third capacitor is grounded.

A luminaire includes the above-mentioned multi-mode dimming circuit.

By constructing a dimming mode control module and applying it to a multi-mode dimming circuit, the present invention simplifies the multi-mode dimming circuit into a rectification filter module, a dimming mode control module, a PWM dimming module, The PWM dimming module is composed of a power supply module, wherein the dimming mode control module is used to receive a PWM dimming signal or a thyristor dimming signal; when receiving the PWM dimming signal, according to the PWM dimming signal Adjust the current value of the LED light board to perform PWM dimming; when receiving a thyristor dimming signal, adjust the current value of the LED light board according to the thyristor dimming signal to perform thyristor dimming; Thus, a drive control compatible with PWM dimming and thyristor dimming is realized, and multiple modes of dimming are integrated, which effectively simplifies the circuit structure and greatly reduces the driving cost and circuit size of the LED dimming circuit.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only for the present invention. In some embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

FIG. 1 is a schematic diagram of a multi-mode dimming circuit provided by an embodiment of the present invention;

2 is a schematic diagram of a multi-mode dimming circuit provided by another embodiment of the present invention;

FIG. 3 is a schematic diagram of a multi-mode control chip provided by an embodiment of the present invention.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

In the present invention, a dimming mode control module is added to the multi-mode dimming circuit, and the dimming mode control module receives the PWM dimming signal or the thyristor dimming signal; when the PWM dimming signal is received, according to the The PWM dimming signal adjusts the current value of the LED light board to perform PWM dimming; when receiving the thyristor dimming signal, adjust the current value of the LED light board according to the thyristor dimming signal, so as to adjust the current value of the LED light board. Thyristor dimming; thus realizes a drive to control multiple modes of dimming, compatible with PWM dimming and thyristor dimming, which effectively simplifies the circuit structure and greatly reduces the driving cost and circuit size of the LED dimming circuit. .

FIG. 1 is a schematic diagram of a multi-mode dimming circuit provided by an embodiment of the present invention. As shown in Figure 1, the multi-mode dimming circuit includes:

a rectification filter module 10, a dimming mode control module 20, a PWM dimming module 30, and a PWM dimming module power supply module 40;

The input end of the rectification filter module 10 is connected to the commercial power, the first output end is connected to the first input end of the dimming mode control module 20 , and the second output end is connected to the power supply module 40 of the PWM dimming module input terminal connection;

The output end of the power supply module 40 of the PWM dimming module is connected to the input end of the PWM dimming module 30;

The output end of the PWM dimming module 30 is connected to the second input end of the dimming mode control module 20;

The rectification filter module 10 is used to convert the commercial power into a direct current signal;

The PWM dimming module power supply module 40 is used to convert the direct current signal into an electrical signal suitable for the PWM dimming module 30, and provide electrical energy to the PWM dimming module 30;

The PWM dimming module 30 is used for generating a PWM dimming signal, and sending the PWM dimming signal to the dimming mode control module 20;

Wherein, the dimming mode control module 20 is used to receive a PWM dimming signal or a thyristor dimming signal; when receiving the PWM dimming signal, adjust the current value of the LED light panel according to the PWM dimming signal, to perform PWM dimming; when receiving a thyristor dimming signal, adjust the current value of the LED lamp panel according to the thyristor dimming signal to perform thyristor dimming.

Here, the multi-mode dimming circuit provided by the embodiment of the present invention defaults to the thyristor dimming mode. After the multi-mode dimming circuit is connected to the AC mains, the dimming mode control module 20 detects the thyristor dimming signal, performs thyristor dimming control on the LED light board, and adjusts according to the thyristor dimmer The driving current of the LED light board makes the LED light board emit different brightness. When the dimming mode control module 20 detects the input of a PWM dimming signal, it performs PWM dimming control on the LED lamp panel, and adjusts the driving current of the LED lamp panel according to the PWM dimming signal, so that the LED lamp panel emits different Brightness; thus realizing a drive to control multiple modes of dimming, compatible with PWM dimming and thyristor dimming, which effectively simplifies the circuit structure.

Optionally, the PWM dimming signal includes but is not limited to one or any combination of a WIFI signal, a 2.4G signal, a Bluetooth signal, a PLC signal, an RF radio frequency signal, and a voltage-divided dimming signal.

Optionally, as a preferred example of the present invention, the dimming mode control module 20 implements one drive to control multiple dimming modes through the multi-mode control chip 21 therein. The multi-mode control chip is used to adjust the current value of the LED light panel according to the PWM dimming signal when receiving the PWM dimming signal to perform PWM dimming; when receiving the thyristor dimming When the signal is received, the current value of the LED lamp panel is adjusted according to the thyristor dimming signal, so as to perform thyristor dimming.

FIG. 2 is a schematic diagram of a multi-mode dimming circuit provided by an embodiment of the present invention. As shown in FIG. 2 , the multi-mode dimming circuit 20 includes:

The multi-mode control chip 21, the first resistor R1, the second resistor R2, the first capacitor C1, the first inductor L1, the first diode D1, the first electrolytic capacitor EC1, the third resistor R3, the fourth resistor R4, the first Five resistors R5;

The common contact between the first end of the first resistor R1 , the first end of the second resistor R2 and the first end of the first inductor L1 is used as the first end of the dimming mode control module 20 . input;

The second end of the first resistor R1 is connected to the first end of the first capacitor C1, and the second end of the first capacitor C1 is grounded;

The second end of the second resistor R2 is connected to the voltage detection end VS of the multi-mode control chip 21;

The common contact between the second end of the first inductor L1 and the driving control end DRAIN of the multi-mode control chip 21 is connected to the anode of the first diode D1;

The common contact between the cathode of the first diode D1 and the first end of the third resistor R3, the first end of the fourth resistor R4, and the anode of the first electrolytic capacitor EC1 is connected to the anode of the LED lamp board connect;

The second end of the third resistor R3 is connected to the high voltage power supply terminal HV of the multi-mode control chip 21 ; the second end of the fourth resistor R4 is connected to the overcurrent protection terminal OVP of the multi-mode control chip 21 ;

The negative electrode of the first electrolytic capacitor EC1 and the negative electrode of the LED lamp board are commonly connected to the first end of the second resistor R2;

The current sampling terminal CS of the multi-mode control chip 21 is grounded through the fifth resistor R5, the GND terminal of the multi-mode control chip 21 is grounded, and the PWM terminal of the multi-mode control chip 21 is connected to the PWM dimming module 30. connect.

Optionally, the rectifier filter module 10 includes a rectifier circuit 11, a second capacitor C2, a second inductor L2, a sixth resistor R6, and a third capacitor C3;

The first end of the rectifier circuit 11 is connected to the live wire L of the AC signal, the second end is connected to the ground wire N of the AC signal, and the fourth end is grounded;

The common contact between the third end of the rectifier circuit 11 and the first end of the second inductor L2 serves as the first output end of the rectifier filter module 10; the second end of the second inductor L2 serves as the first output end of the rectifier filter module 10; The second output end of the rectification filter module 10

The first end of the second capacitor C2 and the first end of the sixth resistor R6 are commonly connected to the first end of the second inductor L2; the second end of the sixth resistor R6 and the first end of the third capacitor C3 One end is commonly connected to the second end of the second inductor L2;

The second terminal of the second capacitor C2 is grounded, and the second terminal of the third capacitor C3 is grounded.

Here, the PWM terminal of the multi-mode control chip is used to detect the PWM dimming signal, and the voltage detection terminal VS is used to detect the thyristor dimming signal. It can be seen from the above FIG. 2 that the embodiment of the present invention realizes a new architecture in which a single control chip is compatible with LED thyristor dimming and PWM dimming through the multi-mode control chip 21, which effectively simplifies the peripheral components and reduces the It reduces the driving cost of the LED and improves the reliability and application range.

Optionally, as a preferred example of the present invention, FIG. 3 is a schematic diagram of a multi-mode control chip 21 provided by an embodiment of the present invention. As shown in FIG. 3 , the multi-mode control chip 21 includes:

chip power supply unit 211, dimming mode identification unit 212, chip constant current control unit 213;

The first end of the chip power supply unit 211 is used as the high voltage power supply end HV of the multi-mode control chip 21, and the second end is connected to the first end of the chip constant current control unit 213;

The first terminal of the dimming mode identification unit 212 is used as the voltage detection terminal VS of the multi-mode control chip 21, the second terminal is used as the overcurrent protection terminal OVP of the multi-mode control chip 21, and the third terminal is used as the The PWM terminal of the multi-mode control chip 21, the fourth terminal is connected to the second terminal of the chip constant current control unit 213;

The third terminal of the chip constant current control unit 213 is used as the driving control terminal DRAIN of the multi-mode control chip 21, and the fourth terminal is used as the current sampling terminal CS of the multi-mode control chip 21;

The chip power supply unit 211 is configured to receive the DC signal output by the rectification filter module 10, and generate and output a reference voltage to the chip constant current control unit 213;

The chip constant current control unit 213 activates the internal MOS tube according to the reference voltage, and adjusts the conduction angle of the MOS tube according to the maximum conduction control information output by the dimming mode identification unit 212 to adjust the LED light. The current value of the board;

The dimming mode identification unit 212 is used to self-check whether there is a PWM dimming signal at the PWM terminal, and if so, adjust the maximum conduction control information following the PWM dimming signal, and output the maximum conduction control signal to The chip constant current control unit 213; if not, detect the voltage waveform of the DC signal through the voltage detection terminal VS, adjust the maximum conduction control information according to the voltage waveform, and output the maximum conduction The control signal is sent to the chip constant current control unit 213 .

After the system is powered on, the AC mains rectified DC voltage is input through the high-voltage power supply terminal HV, and the chip power supply unit 211 supplies power to the chip. When the chip internal voltage reaches the chip turn-on threshold, the chip constant current control unit 213 starts to work .

The chip constant current control unit 213 includes a MOS tube as a switch tube inside. After the internal power supply of the chip is turned on, the chip constant current control unit 213 outputs the minimum driving signal to turn on the MOS tube, and current flows from the driving control terminal DRAIN of the chip to the current sampling terminal CS. At this time, the chip constant current control unit 213 collects the maximum conduction control information Tonmax as feedback to control the conduction angle of the MOS transistor, so as to adjust the current value of the LED lamp panel to realize constant current control. The maximum conduction control information Tonmax is determined by following the sampling signal of the voltage detection terminal VS or the input signal of the PWM terminal.

Optionally, the chip constant current control unit 213 further includes a zero current detector; the zero current detector is used to control the maximum conduction control information according to the reference voltage when the multi-mode control chip is connected to the commercial power The output is at the maximum value, so that the MOS transistor works in the maximum conduction interval.

In the case of no thyristor dimmer or PWM signal input, if the chip is directly connected to the AC mains power supply, the current sampling terminal CS is connected to the zero current detector, and the maximum conduction is controlled by the reference voltage Vref of the zero current detector. The communication control information Tonmax is output at the maximum value, so that the MOS tube works in the maximum conduction interval to achieve the maximum constant value of the output current.

After the internal power supply of the chip is turned on, the dimming mode identification unit 212 first self-checks whether there is an input signal at the PWM terminal. If there is an input signal, the maximum conduction control information Tonmax follows the signal change of the PWM terminal, and then controls the conduction of the MOS tube by driving. Adjust the output current value; if the PWM terminal does not detect the input signal after the chip is powered internally, the voltage detection terminal VS detection works, and the VS terminal detects the voltage waveform after AC mains rectification, thereby outputting different maximum conduction control information Tonmax, adjust the output current value by driving and controlling the conduction of the MOS transistor.

Optionally, as a preferred example of the present invention, the dimming pattern recognition unit 212 is further configured to:

If there is a PWM dimming signal at the self-checking PWM terminal, the comparator output of the voltage detection terminal VS is turned off, so that the maximum conduction control information follows the PWM dimming signal.

Here, in the embodiment of the present invention, by directly outputting a shutdown signal and turning off the comparator output at the VS terminal, it is beneficial to ensure the accurate switching of the LED dimming mode, and realize that a single control chip is compatible with LED thyristor dimming and PWM dimming.

Optionally, as a preferred example of the present invention, the multi-mode control chip 21 further includes an over-temperature protection unit 214;

The over-temperature protection unit 214 is connected to the fifth end of the chip constant current control unit 213;

The over-temperature protection unit 214 is configured to detect the temperature of the NTC multi-mode control chip 21 through a negative temperature coefficient, and when the temperature is greater than or equal to a preset temperature threshold, trigger the under-voltage lockout of the chip power supply unit 211 .

Here, the multi-mode control chip 21 also has a built-in 50uA current source, and the NTC (NegativeTemperature Coefficient) detection resistor will sense the temperature of the chip body, so as to compare with the built-in reference comparator. When the chip body temperature exceeds the preset temperature After the threshold, the comparator inverts the output control signal to turn off the chip power supply unit 211, triggering the under-voltage lockout VCC UVLO, thereby protecting the chip and the driver.

It should be understood that the above functional mode is only an embodiment of the present invention, and is not intended to limit the present invention. In some other embodiments, the specific control logic of the functional mode can also be set according to actual needs.

An embodiment of the present invention also provides a lamp, including the above-mentioned multi-mode dimming circuit. For the details of the multi-mode dimming circuit, please refer to the description of the above-mentioned embodiment, which will not be repeated here.

The above-mentioned embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be used for the foregoing implementations. The technical solutions described in the examples are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the within the protection scope of the present invention.

Claims (10)

1. A multi-mode dimming circuit, comprising: Rectifier filter module, dimming mode control module, PWM dimming module, PWM dimming module power supply module; The input end of the rectification filter module is connected to the commercial power, the first output end is connected to the first input end of the dimming mode control module, and the second output end is connected to the input end of the power supply module of the PWM dimming module connect; The output end of the power supply module of the PWM dimming module is connected with the input end of the PWM dimming module; The output end of the PWM dimming module is connected to the second input end of the dimming mode control module; The rectification filter module is used to convert the commercial power into a direct current signal; The PWM dimming module power supply module is used to convert the direct current signal into an electrical signal suitable for the PWM dimming module, and provide electrical energy to the PWM dimming module; The PWM dimming module is used for generating a PWM dimming signal, and sending the PWM dimming signal to the dimming mode control module; Wherein, the dimming mode control module is used to receive a PWM dimming signal or a thyristor dimming signal; when receiving the PWM dimming signal, adjust the current value of the LED light board according to the PWM dimming signal, so as to PWM dimming is performed; when a thyristor dimming signal is received, the current value of the LED lamp panel is adjusted according to the thyristor dimming signal to perform thyristor dimming. 2 . The multi-mode dimming circuit according to claim 1 , wherein the dimming mode control module comprises a multi-mode control chip, and the multi-mode control chip is used for receiving the PWM dimming signal. 3 . When receiving the thyristor dimming signal, adjust the current value of the LED lamp panel according to the PWM dimming signal to perform PWM dimming; when receiving the thyristor dimming signal, adjust the LED lamp panel according to the thyristor dimming signal. current value for thyristor dimming. 3. The multi-mode dimming circuit of claim 2, wherein the dimming mode control module further comprises: a first resistor, a second resistor, a first capacitor, a first inductor, a first diode, a first electrolytic capacitor, a third resistor, a fourth resistor, and a fifth resistor; a common contact between the first end of the first resistor, the first end of the second resistor and the first end of the first inductor is used as the first input end of the dimming mode control module; The second end of the first resistor is connected to the first end of the first capacitor, and the second end of the first capacitor is grounded; The second end of the second resistor is connected to the voltage detection end VS of the multi-mode control chip; the common contact between the second end of the first inductor and the driving control end DRAIN of the multi-mode control chip is connected to the anode of the first diode; The common contact between the cathode of the first diode and the first end of the third resistor, the first end of the fourth resistor, and the anode of the first electrolytic capacitor is connected to the anode of the LED lamp board; The second end of the third resistor is connected to the high-voltage power supply terminal HV of the multi-mode control chip; the second end of the fourth resistor is connected to the overcurrent protection terminal OVP of the multi-mode control chip; The negative electrode of the first electrolytic capacitor and the negative electrode of the LED lamp board are connected to the first end of the second resistor in common; The current sampling terminal CS of the multi-mode control chip is grounded through the fifth resistor, the GND terminal of the multi-mode control chip is grounded, and the PWM terminal of the multi-mode control chip is connected to the PWM dimming module. 4. The multi-mode dimming circuit according to claim 3, wherein the multi-mode control chip comprises: Chip power supply unit, dimming mode recognition unit, chip constant current control unit; The first end of the chip power supply unit is used as the high-voltage power supply end HV of the multi-mode control chip, and the second end is connected to the first end of the chip constant current control unit; The first terminal of the dimming mode identification unit is used as the voltage detection terminal VS of the multi-mode control chip, the second terminal is used as the overcurrent protection terminal OVP of the multi-mode control chip, and the third terminal is used as the multi-mode control chip. The PWM end of the chip, the fourth end is connected to the second end of the constant current control unit of the chip; The third terminal of the chip constant current control unit is used as the driving control terminal DRAIN of the multi-mode control chip, and the fourth terminal is used as the current sampling terminal CS of the multi-mode control chip; The chip power supply unit is used to receive the DC signal output by the rectification filter module, and generate and output a reference voltage to the chip constant current control unit; The chip constant current control unit activates the internal MOS tube according to the reference voltage, and adjusts the conduction angle of the MOS tube according to the maximum conduction control information output by the dimming mode identification unit, so as to adjust the LED lamp panel. current value; The dimming mode identification unit is used to self-check whether there is a PWM dimming signal at the PWM terminal, and if so, adjust the maximum conduction control information following the PWM dimming signal, and output the maximum conduction control signal to the The chip constant current control unit; if not, detect the voltage waveform of the DC signal through the voltage detection terminal VS, adjust the maximum conduction control information according to the voltage waveform, and output the maximum conduction control signal to the chip constant current control unit. 5. The multi-mode dimming circuit of claim 4, wherein the multi-mode control chip further comprises an over-temperature protection unit; the over-temperature protection unit is connected to the fifth end of the chip constant current control unit; The over-temperature protection unit is configured to detect the temperature of the NTC multi-mode control chip through a negative temperature coefficient, and when the temperature is greater than or equal to a preset temperature threshold, trigger the under-voltage lockout of the chip power supply unit. 6. The multi-mode dimming circuit according to claim 4, wherein the dimming mode identification unit is further used for: If there is a PWM dimming signal at the self-checking PWM terminal, the comparator output of the voltage detection terminal VS is turned off, so that the maximum conduction control information follows the PWM dimming signal. 7. The multi-mode dimming circuit according to claim 4, wherein the chip constant current control unit further comprises a zero current detector; The zero current detector is used for controlling the maximum conduction control information to be output at the maximum value according to the reference voltage when the multi-mode control chip is connected to the commercial power, so that the MOS transistor works in the maximum conduction interval. 8. The multi-mode dimming circuit according to any one of claims 1 to 7, wherein the PWM dimming signal comprises a WIFI signal, a 2.4G signal, a Bluetooth signal, a PLC signal, an RF radio frequency signal, a voltage divider One of the dimming signals or any combination thereof. 9. The multi-mode dimming circuit according to any one of claims 1 to 7, wherein the rectifier filter module comprises a rectifier circuit, a second capacitor, a second inductor, a sixth resistor, and a third capacitor; The first end of the rectifier circuit is connected to the live wire of the AC signal, the second end is connected to the ground wire of the AC signal, and the fourth end is grounded; The common contact between the third end of the rectifier circuit and the first end of the second inductor is used as the first output end of the rectifier filter module; the second end of the second inductor is used as the rectifier filter module the second output terminal of the module; The first end of the second capacitor and the first end of the sixth resistor are commonly connected to the first end of the second inductor; the second end of the sixth resistor and the first end of the third capacitor are commonly connected to the second end of the second inductor; The second end of the second capacitor is grounded, and the second end of the third capacitor is grounded. 10. A lamp, characterized by comprising the multi-mode dimming circuit according to any one of claims 1 to 9.

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