A multi-mode dimming circuit and lamp

Abstract

The present invention provides a multi-mode dimming circuit, comprising: a rectifier filter module, a dimming mode control module, a PWM dimming module, and a PWM dimming module power supply module. The present invention uses the dimming mode control module to receive a PWM dimming signal or a thyristor dimming signal; when the PWM dimming signal is received, the current value of the LED lamp board is adjusted according to the PWM dimming signal to perform PWM dimming; when the thyristor dimming signal is received, the current value of the LED lamp board is adjusted according to the thyristor dimming signal to perform thyristor dimming, thereby realizing a drive control that is compatible with PWM dimming and thyristor dimming at the same time, integrating multiple modes of dimming, effectively simplifying the circuit structure, and greatly reducing the drive cost and circuit size of the LED dimming circuit.

Description

Technical Field

[0001] The present invention relates to the field of electronic technology, and in particular to a multi-mode dimming circuit and a lamp. Background Art

[0002] The existing driver circuit compatible with thyristor dimming and PWM dimming includes a rectifier filter module, a PWM dimming drive circuit, a thyristor dimming drive circuit, a PWM dimming and thyristor dimming drive switching circuit, and a PWM dimming module and a power supply circuit. Its working principle is:

[0003] When powered on by AC mains, the thyristor dimming drive circuit is started by default, and the LED light board emits different brightnesses following the current size of the thyristor dimming drive circuit; when the PWM dimming module is connected or working, it outputs a PWM signal, forcing the thyristor dimming drive circuit to turn off, and the LED light board switches to follow the current size of the PWM dimming drive circuit to emit different brightnesses.

[0004] Since two driving circuits are included, the existing circuit structure is extremely complex, and there are problems of large circuit size and high cost. Summary of the invention

[0005] 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 in the existing multi-mode dimming circuit.

[0006] The present invention is implemented in this way: a multi-mode dimming circuit includes:

[0007] Rectification and filtering module, dimming mode control module, PWM dimming module, PWM dimming module power supply module;

[0008] The input end of the rectifier and filter module is connected to the mains, 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 PWM dimming module power supply module;

[0009] The output end of the PWM dimming module power supply module is connected to the input end of the PWM dimming module;

[0010] The output end of the PWM dimming module is connected to the second input end of the dimming mode control module;

[0011] The rectifier and filter module is used to convert the mains power into a direct current signal;

[0012] The PWM dimming module power supply module is used to convert a DC signal into an electrical signal suitable for the PWM dimming module, and provide electrical energy to the PWM dimming module;

[0013] The PWM dimming module is used to generate a PWM dimming signal, and send the PWM dimming signal to the dimming mode control module;

[0014] Among them, the dimming mode control module is used to receive a PWM dimming signal or a thyristor dimming signal; when a PWM dimming signal is received, the current value of the LED light board is adjusted according to the PWM dimming signal to perform PWM dimming; when a thyristor dimming signal is received, the current value of the LED light board is adjusted according to the thyristor dimming signal to perform thyristor dimming.

[0015] Optionally, the dimming mode control module includes a multi-mode control chip, and the multi-mode control chip is used to adjust the current value of the LED light board according to the PWM dimming signal when receiving the PWM dimming signal to perform PWM dimming; when receiving the thyristor dimming signal, the multi-mode control chip is used to adjust the current value of the LED light board according to the thyristor dimming signal to perform thyristor dimming.

[0016] Optionally, the dimming mode control module further includes:

[0017] 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;

[0018] A common point between the first end of the first resistor, the first end of the second resistor and the first end of the first inductor serves as a first input end of the dimming mode control module;

[0019] 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;

[0020] The second end of the second resistor is connected to the voltage detection terminal VS of the multi-mode control chip;

[0021] A common point between the second end of the first inductor and the driving control terminal DRAIN of the multi-mode control chip is connected to the anode of the first diode;

[0022] The cathode of the first diode is connected to the common point between the first end of the third resistor, the first end of the fourth resistor, and the positive electrode of the first electrolytic capacitor, and the positive electrode of the LED light board;

[0023] 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;

[0024] The negative electrode of the first electrolytic capacitor and the negative electrode of the LED light board are connected to the first end of the second resistor;

[0025] The current sampling terminal CS of the multi-mode control chip is grounded through a 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.

[0026] Optionally, the multi-mode control chip includes:

[0027] Chip power supply unit, dimming mode recognition unit, chip constant current control unit;

[0028] The first end of the chip power supply unit serves 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;

[0029] The first end of the dimming mode recognition unit serves as the voltage detection end VS of the multi-mode control chip, the second end serves as the overcurrent protection end OVP of the multi-mode control chip, the third end serves as the PWM end of the multi-mode control chip, and the fourth end is connected to the second end of the chip constant current control unit;

[0030] The third terminal of the chip constant current control unit serves as the driving control terminal DRAIN of the multi-mode control chip, and the fourth terminal serves as the current sampling terminal CS of the multi-mode control chip;

[0031] The chip power supply unit is used to receive the DC signal output by the rectifier and filter module, generate and output a reference voltage to the chip constant current control unit;

[0032] The chip constant current control unit starts 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 recognition unit to adjust the current value of the LED light board;

[0033] The dimming mode recognition unit is used to self-check whether there is a PWM dimming signal at the PWM end. If so, the maximum conduction control information is adjusted according to the PWM dimming signal, and the maximum conduction control information is output to the chip constant current control unit; if not, the voltage waveform of the DC signal is detected through the voltage detection end VS, the maximum conduction control information is adjusted according to the voltage waveform, and the maximum conduction control information is output to the chip constant current control unit.

[0034] Optionally, the multi-mode control chip further includes an over-temperature protection unit;

[0035] The over-temperature protection unit is connected to the fifth end of the chip constant current control unit;

[0036] The over-temperature protection unit is used 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, the under-voltage lockout of the chip power supply unit is triggered.

[0037] Optionally, the dimming mode recognition unit is further used for:

[0038] If there is a PWM dimming signal at the self-detection 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.

[0039] Optionally, the chip constant current control unit further includes a zero current detector;

[0040] The zero current detector is used to control the maximum conduction control information to be output at a maximum value according to a reference voltage when the multi-mode control chip is connected to the mains, so that the MOS tube operates in a maximum conduction range.

[0041] Optionally, the PWM dimming signal includes one of a WIFI signal, a 2.4G signal, a Bluetooth signal, a PLC signal, an RF signal, a voltage-dividing dimming signal, or any combination thereof.

[0042] Optionally, the rectification and filtering module includes a rectification circuit, a second capacitor, a second inductor, a sixth resistor, and a third capacitor;

[0043] 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;

[0044] The common point between the third end of the rectifier circuit and the first end of the second inductor serves as the first output end of the rectifier and filter module; the second end of the second inductor serves as the second output end of the rectifier and filter module;

[0045] 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;

[0046] A second end of the second capacitor is grounded, and a second end of the third capacitor is grounded.

[0047] A lamp comprises the multi-mode dimming circuit as described above.

[0048] The present invention constructs a dimming mode control module and applies it to a multi-mode dimming circuit, so that the multi-mode dimming circuit is simplified to consist of a rectifier filter module, a dimming mode control module, a PWM dimming module, and a PWM dimming module power supply module, wherein the dimming mode control module is used to receive a PWM dimming signal or a thyristor dimming signal; when a PWM dimming signal is received, the current value of the LED lamp board is adjusted according to the PWM dimming signal to perform PWM dimming; when a thyristor dimming signal is received, the current value of the LED lamp board is adjusted according to the thyristor dimming signal to perform thyristor dimming; thereby achieving a drive control that is compatible with PWM dimming and thyristor dimming, integrating multiple modes of dimming, effectively simplifying the circuit structure, and greatly reducing the drive cost and circuit size of the LED dimming circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0050] Figure 1 is a schematic diagram of a multi-mode dimming circuit provided by an embodiment of the present invention;

[0051] Figure 2 is a schematic diagram of a multi-mode dimming circuit provided by another embodiment of the present invention;

[0052] Figure 3 is a schematic diagram of a multi-mode control chip provided in one embodiment of the present invention. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0054] The present invention adds a dimming mode control module to a multi-mode dimming circuit, and the dimming mode control module receives a PWM dimming signal or a thyristor dimming signal; when a PWM dimming signal is received, the current value of the LED lamp board is adjusted according to the PWM dimming signal to perform PWM dimming; when a thyristor dimming signal is received, the current value of the LED lamp board is adjusted according to the thyristor dimming signal to perform thyristor dimming; thereby realizing one drive to control multiple modes of dimming, being compatible with PWM dimming and thyristor dimming, effectively simplifying the circuit structure, and greatly reducing the driving cost and circuit size of the LED dimming circuit.

[0055] Figure 1 Schematic diagram of a multi-mode dimming circuit provided by an embodiment of the present invention. Figure 1 As shown, the multi-mode dimming circuit includes:

[0056] Rectification and filtering module 10, dimming mode control module 20, PWM dimming module 30, PWM dimming module power supply module 40;

[0057] The input end of the rectifier filter module 10 is connected to the mains, 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 input end of the PWM dimming module power supply module 40;

[0058] The output end of the PWM dimming module power supply module 40 is connected to the input end of the PWM dimming module 30;

[0059] The output end of the PWM dimming module 30 is connected to the second input end of the dimming mode control module 20;

[0060] The rectifier and filter module 10 is used to convert the mains power into a direct current signal;

[0061] The PWM dimming module power supply module 40 is used to convert the DC signal into an electrical signal suitable for the PWM dimming module 30 and provide electrical energy to the PWM dimming module 30;

[0062] The PWM dimming module 30 is used to generate a PWM dimming signal, and send the PWM dimming signal to the dimming mode control module 20;

[0063] Among them, the dimming mode control module 20 is used to receive a PWM dimming signal or a thyristor dimming signal; when a PWM dimming signal is received, the current value of the LED light board is adjusted according to the PWM dimming signal to perform PWM dimming; when a thyristor dimming signal is received, the current value of the LED light board is adjusted according to the thyristor dimming signal to perform thyristor dimming.

[0064] 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 the driving current of the LED light board according to the thyristor dimmer, so that the LED light board emits different brightness. When the dimming mode control module 20 detects that a PWM dimming signal is input, it performs PWM dimming control on the LED light board, and adjusts the driving current of the LED light board according to the PWM dimming signal, so that the LED light board emits different brightness; thereby realizing one drive to control multiple modes of dimming, which is compatible with PWM dimming and thyristor dimming, and effectively simplifies the circuit structure.

[0065] Optionally, the PWM dimming signal includes but is not limited to one of a WIFI signal, a 2.4G signal, a Bluetooth signal, a PLC signal, an RF signal, and a voltage-dividing dimming signal, or any combination thereof.

[0066] Optionally, as a preferred example of the present invention, the dimming mode control module 20 realizes 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 board according to the PWM dimming signal when receiving the PWM dimming signal 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 to perform thyristor dimming.

[0067] Figure 2 Schematic diagram of a multi-mode dimming circuit provided by an embodiment of the present invention. Figure 2 As shown, the multi-mode dimming circuit includes:

[0068] A multi-mode control chip 21, a first resistor R1, a second resistor R2, a first capacitor C1, a first inductor L1, a first diode D1, a first electrolytic capacitor EC1, a third resistor R3, a fourth resistor R4, and a fifth resistor R5;

[0069] A common point 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 serves as a first input end of the dimming mode control module 20;

[0070] 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;

[0071] The second end of the second resistor R2 is connected to the voltage detection terminal VS of the multi-mode control chip 21;

[0072] A common point 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;

[0073] The cathode of the first diode D1 and the common point between the first end of the third resistor R3, the first end of the fourth resistor R4, and the positive electrode of the first electrolytic capacitor EC1 are connected to the positive electrode of the LED light board;

[0074] 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;

[0075] The cathode of the first electrolytic capacitor EC1 and the cathode of the LED lamp board are connected to the first end of the second resistor R2;

[0076] The current sampling terminal CS of the multi-mode control chip 21 is grounded through a 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 .

[0077] Optionally, the rectification and filtering module 10 includes a rectification circuit 11, a second capacitor C2, a second inductor L2, a sixth resistor R6, and a third capacitor C3;

[0078] 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;

[0079] The common point 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 second output end of the rectifier filter module 10.

[0080] 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 are commonly connected to the second end of the second inductor L2;

[0081] A second end of the second capacitor C2 is grounded, and a second end of the third capacitor C3 is grounded.

[0082] 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. Figure 2It can be seen 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 peripheral components, reduces the driving cost of LEDs, and improves reliability and application scope.

[0083] Optionally, as a preferred example of the present invention, Figure 3 Schematic diagram of a multi-mode control chip 21 provided in an embodiment of the present invention. Figure 3 As shown, the multi-mode control chip 21 includes:

[0084] Chip power supply unit 211, dimming mode recognition unit 212, chip constant current control unit 213;

[0085] The first end of the chip power supply unit 211 serves 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;

[0086] The first end of the dimming mode recognition unit 212 serves as the voltage detection end VS of the multi-mode control chip 21, the second end serves as the overcurrent protection end OVP of the multi-mode control chip 21, the third end serves as the PWM end of the multi-mode control chip 21, and the fourth end is connected to the second end of the chip constant current control unit 213;

[0087] The third terminal of the chip constant current control unit 213 serves as the driving control terminal DRAIN of the multi-mode control chip 21, and the fourth terminal serves as the current sampling terminal CS of the multi-mode control chip 21;

[0088] The chip power supply unit 211 is used to receive the DC signal output by the rectifier and filter module 10, generate and output a reference voltage to the chip constant current control unit 213;

[0089] The chip constant current control unit 213 starts 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 recognition unit 212 to adjust the current value of the LED light board;

[0090] The dimming mode recognition unit 212 is used to self-check whether there is a PWM dimming signal at the PWM end. If so, the maximum conduction control information is adjusted according to the PWM dimming signal, and the maximum conduction control information is output to the chip constant current control unit 213; if not, the voltage waveform of the DC signal is detected through the voltage detection end VS, the maximum conduction control information is adjusted according to the voltage waveform, and the maximum conduction control information is output to the chip constant current control unit 213.

[0091] After the system is powered on, the DC voltage after AC mains rectification is input through the high voltage power supply terminal HV, and the chip power supply unit 211 supplies power to the inside of the chip. When the internal voltage of the chip reaches the chip start-up threshold, the chip constant current control unit 213 starts working.

[0092] The chip constant current control unit 213 includes a MOS tube as a switch tube. After the internal power supply of the chip is turned on, the chip constant current control unit 213 outputs a minimum drive signal to turn on the MOS tube, and current flows from the chip drive control terminal DRAIN 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 tube to adjust the current value of the LED light board and realize constant current control. The maximum conduction control information Tonmax follows the sampling signal of the voltage detection terminal VS or the input signal of the PWM terminal to make a decision.

[0093] Optionally, the chip constant current control unit 213 also includes a zero current detector; the zero current detector is used to control the maximum conduction control information to be output at a maximum value according to a reference voltage when the multi-mode control chip is connected to the mains, so that the MOS tube operates in the maximum conduction range.

[0094] In the absence of a thyristor dimmer or PWM signal input, if the chip is directly connected in series to the AC mains power supply, the current sampling terminal CS is connected to the zero current detector, and the maximum conduction control information Tonmax is controlled to be output at the maximum value by relying on the reference voltage Vref of the zero current detector, so that the MOS tube works in the maximum conduction range to achieve the maximum constant value of the output current.

[0095] After the internal power supply of the chip is turned on, the dimming mode recognition unit 212 first self-checks whether there is an input signal at the PWM end. If there is an input signal, the maximum conduction control information Tonmax follows the signal change at the PWM end, and then the output current value is adjusted by driving and controlling the MOS tube to conduct. If the PWM end does not detect an input signal after the internal power supply of the chip is turned on, the voltage detection end VS detection takes effect, and the voltage waveform after the AC mains rectification is detected through the VS end, thereby outputting different maximum conduction control information Tonmax, and adjusting the output current value by driving and controlling the MOS tube to conduct.

[0096] Optionally, as a preferred example of the present invention, the dimming mode recognition unit 212 is further configured to:

[0097] If there is a PWM dimming signal at the self-detection 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.

[0098] Here, the embodiment of the present invention directly outputs a shutdown signal to shut down the comparator output at the VS end, which is beneficial to ensure accurate switching of the LED dimming mode and realize compatibility of a single control chip with LED thyristor dimming and PWM dimming.

[0099] Optionally, as a preferred example of the present invention, the multi-mode control chip 21 further includes an over-temperature protection unit 214;

[0100] The over-temperature protection unit 214 is connected to the fifth end of the chip constant current control unit 213;

[0101] The over-temperature protection unit 214 is used to detect the temperature of the multi-mode control chip 21 through a negative temperature coefficient (NTC), and when the temperature is greater than or equal to a preset temperature threshold, the under-voltage lockout of the chip power supply unit 211 is triggered.

[0102] Here, the multi-mode control chip 21 also has a built-in 50uA current source, and the NTC (Negative Temperature Coefficient) detection resistor senses the temperature of the chip body and compares it with the built-in reference comparator. When the temperature of the chip body exceeds the preset temperature threshold, the comparator flips the output control signal to shut down the chip power supply unit 211, triggering the undervoltage lockout VCC UVLO, thereby protecting the chip and the driver.

[0103] It should be understood that the above functional mode is only one embodiment of the present invention and is not intended to limit the present invention. In some other embodiments, specific control logic of the functional mode may also be set according to actual needs.

[0104] The embodiment of the present invention further provides a lamp, comprising the multi-mode dimming circuit as described above. The multi-mode dimming circuit is described in detail in the above embodiment, and will not be described in detail here.

[0105] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A multi-mode dimming circuit, characterized in that: include: Rectification and filtering module, dimming mode control module, PWM dimming module, PWM dimming module power supply module; The input end of the rectifier and filter module is connected to the mains, 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 PWM dimming module power supply module; The output end of the PWM dimming module power supply module is connected to 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 rectifier and filter module is used to convert the mains power into a direct current signal; The PWM dimming module power supply module is used to convert a DC 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 to generate a PWM dimming signal, and send the PWM dimming signal to the dimming mode control module; The dimming mode control module is used to receive a PWM dimming signal or a thyristor dimming signal; when a PWM dimming signal is received, the current value of the LED light board is adjusted according to the PWM dimming signal to perform PWM dimming; when a thyristor dimming signal is received, the current value of the LED light board is adjusted according to the thyristor dimming signal to perform thyristor dimming; The dimming mode control module includes a multi-mode control chip, and the multi-mode control chip is used to adjust the current value of the LED lamp board according to the PWM dimming signal when receiving the PWM dimming signal to perform PWM dimming; when receiving the thyristor dimming signal, adjust the current value of the LED lamp board according to the thyristor dimming signal to perform thyristor dimming; The dimming mode control module also 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 point between the first end of the first resistor, the first end of the second resistor and the first end of the first inductor serves as a 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 terminal VS of the multi-mode control chip; A common point between the second end of the first inductor and the driving control terminal DRAIN of the multi-mode control chip is connected to the anode of the first diode; The cathode of the first diode is connected to the common point between the first end of the third resistor, the first end of the fourth resistor, and the positive electrode of the first electrolytic capacitor, and the positive electrode of the LED light 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 light board are connected to the first end of the second resistor; The current sampling terminal CS of the multi-mode control chip is grounded through a 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; 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 serves 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 end of the dimming mode recognition unit serves as the voltage detection end VS of the multi-mode control chip, the second end serves as the overcurrent protection end OVP of the multi-mode control chip, the third end serves as the PWM end of the multi-mode control chip, and the fourth end is connected to the second end of the chip constant current control unit; The third terminal of the chip constant current control unit serves as the driving control terminal DRAIN of the multi-mode control chip, and the fourth terminal serves 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 rectifier and filter module, generate and output a reference voltage to the chip constant current control unit; The chip constant current control unit starts 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 recognition unit to adjust the current value of the LED light board; The dimming mode recognition unit is used to self-check whether there is a PWM dimming signal at the PWM end. If so, the maximum conduction control information is adjusted according to the PWM dimming signal, and the maximum conduction control information is output to the chip constant current control unit; if not, the voltage waveform of the DC signal is detected through the voltage detection end VS, the maximum conduction control information is adjusted according to the voltage waveform, and the maximum conduction control information is output to the chip constant current control unit.

2. The multi-mode dimming circuit according to claim 1, characterized in that: The multi-mode control chip also 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 used 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, the under-voltage lockout of the chip power supply unit is triggered.

3. The multi-mode dimming circuit according to claim 2, characterized in that: The dimming mode recognition unit is also used for: If there is a PWM dimming signal at the self-detection 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.

4. The multi-mode dimming circuit according to claim 1, wherein: The chip constant current control unit also includes a zero current detector; The zero current detector is used to control the maximum conduction control information to be output at a maximum value according to a reference voltage when the multi-mode control chip is connected to the mains, so that the MOS tube operates in a maximum conduction range.

5. The multi-mode dimming circuit according to any one of claims 1 to 4, characterized in that: The PWM dimming signal includes one of a WIFI signal, a 2.4G signal, a Bluetooth signal, a PLC signal, an RF signal, and a voltage-dividing dimming signal, or any combination thereof.

6. The multi-mode dimming circuit according to any one of claims 1 to 4, characterized in that: The rectification and filtering module includes a rectification 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 point between the third end of the rectifier circuit and the first end of the second inductor serves as the first output end of the rectifier and filter module; the second end of the second inductor serves as the second output end of the rectifier and filter 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; A second end of the second capacitor is grounded, and a second end of the third capacitor is grounded.

7. A lamp, characterized in that: The invention comprises the multi-mode dimming circuit as claimed in any one of claims 1 to 6.

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