LED lamp dimming circuit and corresponding circuit board

Abstract

According to the LED lamp dimming circuit and the corresponding circuit board provided by the invention, the power supply module outputs the power supply voltage, and the switch module can control the on-off of the voltage conversion module. The voltage conversion module generates a stabilized first conversion voltage and a stabilized second conversion voltage based on the supply voltage. The first energy storage module generates an LED lamp power supply voltage based on the first conversion voltage, and the LED lamp power supply voltage can supply power to the LED lamp module. The second energy storage module generates a constant-current power supply voltage based on the second conversion voltage, and the constant-current power supply voltage can supply power to the constant-current module. The voltage transformation module generates a stable third conversion voltage based on the second conversion voltage. The third conversion voltage can supply power to the communication chip interface, and the communication chip interface can output PWM signals of an external communication chip. The constant-current module can stabilize the current of the PWM signal so as to generate a constant-current control signal. The LED lamp module can receive a control signal, and the control signal can control the color temperature of an LED lamp in the LED lamp module.

Description

Technical Field

[0001] This invention relates to the field of circuit technology, and in particular to an LED lamp dimming circuit and a corresponding circuit board. Background Technology

[0002] In modern society, LED lights are a new type of lighting device, boasting advantages such as high efficiency, energy saving, and environmental friendliness. Therefore, LED lights are widely used in home lighting, commercial lighting, and automotive lighting. Dimming circuits can be used to adjust parameters such as brightness and color temperature of LED lights. However, existing dimming circuits are prone to voltage fluctuations during operation, resulting in technical problems with their ability to operate stably for extended periods.

[0003] Therefore, it is necessary to provide an LED lamp dimming circuit and a corresponding circuit board to solve the above-mentioned technical problems. Summary of the Invention

[0004] This invention provides an LED lamp dimming circuit and a corresponding circuit board, which effectively solves the technical problem that existing dimming circuits are difficult to operate stably for a long time.

[0005] This invention provides an LED lamp dimming circuit, comprising: The power supply module is used to output the power supply voltage; A switching module, one end of which is connected to the power supply module and the other end of which is connected to the voltage conversion module, is used to control the on / off state of the voltage conversion module; The voltage conversion module is connected to the power supply module and is used to perform voltage conversion operation on the power supply voltage based on the signal of the switching module to generate a stable first conversion voltage and a second conversion voltage. The first energy storage module is used to store energy in the first conversion voltage and generate an LED lamp power supply voltage based on the first conversion voltage. The second energy storage module is used to perform energy storage operation on the second conversion voltage and generate a constant current supply voltage based on the second conversion voltage; A transformer module is used to perform voltage conversion on the second converted voltage to generate a stable third converted voltage; The communication chip interface is used to receive the third conversion voltage, which is used to power the communication chip interface. The communication chip interface is also used to output the PWM signal of an external communication chip. The constant current module is used to receive a constant current supply voltage, which is used to power the constant current module. The constant current module is used to stabilize the current of the PWM signal to generate a constant current control signal. The LED lamp module is used to receive the LED lamp power supply voltage, which is used to power the LED lamp module. The LED lamp module is also used to receive the control signal, which is used to control the color temperature of the LED lamps inside the LED lamp module.

[0006] A circuit board comprising any of the above-described LED dimming circuits.

[0007] Compared to existing technologies, the advantages of this invention are as follows: This invention provides an LED lamp dimming circuit, which includes a power supply module, a voltage conversion module, a first energy storage module, a second energy storage module, a transformer module, a communication chip interface, a constant current module, and an LED lamp module. The communication chip interface can output a PWM signal from an external communication chip, and the constant current module can stabilize the current of the PWM signal. The constant current module can generate a constant current control signal, which the LED lamp module can receive and control the color temperature of the LEDs inside the LED lamp module. The power supply module outputs a power supply voltage, which the voltage conversion module converts into a stable first conversion voltage and a second conversion voltage. The first conversion voltage generates the LED lamp power supply voltage through the first energy storage module, and the second conversion voltage generates a constant current power supply voltage through the second energy storage module. Thus, the LED lamp power supply voltage can stably power the LED lamp module, and the constant current power supply voltage can stably power the constant current module. Furthermore, the second conversion voltage generates a stable third conversion voltage through the transformer module, which can also stably power the communication chip interface. Therefore, the power supply voltage of this LED dimming circuit is relatively stable and not prone to fluctuations. Because this dimming circuit can provide a stable power supply voltage, the communication chip interface, constant current module, and LED module can all operate stably for extended periods, effectively solving the technical problem of existing dimming circuits' inability to operate stably for long periods. Consequently, this LED dimming circuit can provide users with good lighting and dimming effects. Therefore, products equipped with this LED dimming circuit also offer a better user experience.

[0008] Furthermore, the voltage conversion module can generate a fourth conversion voltage based on the supply voltage and the conduction signal. When the voltage conversion module generates the fourth conversion voltage, the energy storage unit can generate a stable drive voltage based on this fourth conversion voltage, thereby stably driving the drive unit. The energy storage unit can absorb and store energy from the fluctuations in the power supply module during the initial startup phase, avoiding drive instability caused by fluctuations in the power supply module. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments are briefly introduced below. The drawings described below are only the corresponding drawings of some embodiments of the present invention.

[0010] Figure 1 This is a structural diagram of an embodiment of the LED lamp dimming circuit of the present invention.

[0011] Figure 2 This is a circuit diagram of an embodiment of the LED lamp dimming circuit of the present invention.

[0012] In the diagram, 10 is the LED dimming circuit; 11 is the power supply module; 12 is the switch module; 121 is the energy storage unit; 122 is the drive unit; 13 is the voltage conversion module; 131 is the main coil; 132 is the first coil; 133 is the second coil; 134 is the third coil; 14 is the first energy storage module; 15 is the second energy storage module; 16 is the transformer module; 17 is the communication chip interface; 171 is the interface power supply pin; 18 is the constant current module; 181 is the constant current power supply pin; 182 is the constant current power supply pin; 19 is the LED module; 191 is the surge protection module; 192 is the rectifier module; and 193 is the filter module. Detailed Implementation

[0013] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0014] In the diagram, units with similar structures are represented by the same labels.

[0015] Please refer to Figure 1 and Figure 2This invention provides an LED lamp dimming circuit 10. The LED lamp dimming circuit 10 is applied in a circuit board and includes a power supply module 11, a switch module 12, a voltage conversion module 13, a first energy storage module 14, a second energy storage module 15, a transformer module 16, a communication chip interface 17, a constant current module 18, and an LED lamp module 19. The power supply module 11 outputs a power supply voltage. One end of the switch module 12 is connected to the power supply module 11. The other end of the switch module 12 is connected to the voltage conversion module 13, and the switch module 12 controls the on / off state of the voltage conversion module 13. The voltage conversion module 13 is connected to the power supply module 11 and performs voltage conversion operations on the power supply voltage. The voltage conversion module 13 can generate a stable first conversion voltage and a second conversion voltage. The first energy storage module 14 can store energy in the first conversion voltage and generate an LED lamp power supply voltage of 55V based on the first conversion voltage. The second energy storage module 15 can perform energy storage operation on the second conversion voltage. The second energy storage module 15 generates a constant current supply voltage of 12V based on the second conversion voltage. The transformer module 16 can perform voltage conversion operation on the second conversion voltage. The transformer module 16 can generate a stable third conversion voltage of 3.3V.

[0016] Please refer to Figure 1 and Figure 2 The communication chip interface 17 can receive a third conversion voltage. This third conversion voltage powers the communication chip interface 17, which can also output a PWM signal from an external communication chip. The constant current module 18 can receive a constant current supply voltage, which powers the constant current module 18. The constant current module 18 can stabilize the current of the PWM signal and generate a constant current control signal. The LED module 19 can receive an LED supply voltage, which powers the LED module 19. The LED module 19 can also receive this control signal, which controls the color temperature of the LEDs inside the LED module 19.

[0017] Please refer to Figures 1 to 2 The following is a detailed description of the specific structure of the LED dimming circuit 10: The voltage conversion module 13 includes a main coil 131 and a first coil 132. The first energy storage module 14 includes a first energy storage capacitor EC6 and a first energy storage capacitor EC8. The LED module 19 includes a VO pin. The main coil 131 is connected to the power supply module 11 and can receive the power supply voltage. The first coil 132 is connected to the first energy storage capacitor. The main coil 131 and the first coil 132 can form a transformer, thereby performing voltage conversion on the power supply voltage. The first coil 132 can output a first converted voltage. The first energy storage capacitor can store energy in the first converted voltage and can generate a stable LED power supply voltage based on the first converted voltage. The VO pin is connected to the first energy storage capacitor. The VO pin is used to receive the LED power supply voltage, which can power the LED module 19. The switching module 12 includes a switching chip and a MOSFET Q2. The switching chip is model OB3336A, and the switching chip U3 can be turned on based on the power supply voltage. The switching chip U3 can control the on / off state of the MOSFET Q2, thereby controlling the on / off state of the voltage conversion module 13.

[0018] Please refer to Figures 1 to 2 The voltage conversion module 13 includes a second coil 133. The second energy storage module 15 includes a second energy storage capacitor C16, and the second coil 133 is connected to the second energy storage capacitor C16. The constant current module 18 also includes a constant current chip M1 and a constant current chip M5. The constant current chip M1 is provided with a constant current power supply pin 181, and the constant current chip M5 is provided with a constant current power supply pin 182. The main coil 131 and the second coil 133 can form a transformer, thereby performing a voltage conversion operation on the supply voltage. The second coil 133 is used to output a second converted voltage. The second energy storage capacitor C16 can perform an energy storage operation on the second converted voltage, and the second energy storage capacitor C16 can generate a stable constant current supply voltage based on the second converted voltage. The constant current supply pins 181 and 182 are both connected to the second energy storage capacitor C16, and are used to receive the constant current supply voltage, which can power the constant current chips M1 and M5.

[0019] Please refer to Figures 1 to 2The transformer module 16 includes a transformer chip U2, model SGM61410. Transformer chip U2 includes an IN pin and an SW pin. The communication chip interface 17 includes an interface power supply pin 171. The IN pin is connected to a second energy storage capacitor and can receive a second conversion voltage. Transformer chip U2 performs voltage conversion on this second conversion voltage. Transformer chip U2 can generate a stable third conversion voltage, which can be output through the SW pin. The SW pin is connected to the interface power supply pin 171, which receives the third conversion voltage and uses it to power the communication chip interface 17.

[0020] Please refer to Figures 1 to 2 The communication chip interface 17 includes a PWMCW pin and a PWMWW pin. Constant current chip M1 and constant current chip M5 each have a PWM pin and an OUT pin. The LED module 19 includes a CW pin and a WW pin. The PWMCW and PWMWW pins are used to output PWM signals from the external communication chip. The PWM pin of constant current chip M5 is connected to the PWMCW pin, and the PWM pin of constant current chip M1 is connected to the PWMWW pin. The PWM pins of constant current chips M1 and M5 are used to receive PWM signals. The OUT pin of constant current chip M1 is connected to the WW pin, and the OUT pin of constant current chip M5 is connected to the CW pin. The OUT pins of constant current chips M1 and M5 are used to output control signals. The CW and WW pins are used to receive control signals, which control the color temperature of the LEDs inside the LED module 19.

[0021] Please refer to Figures 1 to 2The LED dimming circuit 10 also includes a surge protection module 191. One end of the surge protection module 191 is connected to the power supply module 11, and the other end is connected to the switch module 12 and the voltage conversion module 13. The surge protection module 191 can perform surge protection operation on the power supply voltage. Therefore, the surge protection module 191 can prevent the power supply voltage from being too high and damaging the downstream circuit components. The LED dimming circuit 10 also includes a rectifier module 192. One end of the rectifier module 192 is connected to the surge protection module 191, and the other end is connected to the switch module 12 and the voltage conversion module 13. The rectifier module 192 can perform rectification operation on the power supply voltage. The rectifier module 192 includes a rectifier bridge, which is composed of four diodes. Utilizing the unidirectional conduction characteristic of diodes, the rectifier bridge can convert the AC power supply voltage into a DC power supply voltage, thereby enabling the LED lamp to operate normally. The LED dimming circuit 10 also includes a filter module 193, which is connected in parallel with the rectifier module 192. The filter module 193 is used to filter the power supply voltage. The filter module 193 includes a filter capacitor CX1, which is connected in parallel with the rectifier bridge. The filter capacitor CX1 can remove noise or interference from the power supply voltage, thereby improving the quality and reliability of the power supply voltage.

[0022] The switching module 12 includes a first MOSFET Q8, and the energy storage unit 121 includes an energy storage capacitor C4. The driving unit 122 includes a driving chip U3 and a second MOSFET Q2. The driving chip U3 is model OB3336A and includes a VDD pin and a GATE pin. The drain of the first MOSFET Q8 is connected to the power supply module 11, and the source of the first MOSFET Q8 is connected to the energy storage capacitor C4. The energy storage capacitor C4 is connected to the VDD pin, and the GATE pin is connected to the gate of the second MOSFET Q2. The drain of the second MOSFET Q2 is connected to the voltage conversion module 13, and the source of the second MOSFET Q2 is grounded. The switching module 12 also includes a first transistor Q10, and the voltage conversion module 13 includes a main coil 131, a first coil 132, a second coil 133, and a third coil 134. The main coil 131 is connected to the power supply module 11 and the drain of the second MOSFET Q2. One end of the third coil 134 is connected to the base of the first transistor Q10, and the other end of the third coil 134 is grounded. The collector of the first transistor Q10 is connected to the gate of the first MOSFET Q8, and the emitter of the first transistor Q10 is grounded.

[0023] Please refer to Figures 1 to 2When the power supply module 11 outputs the power supply voltage, the first MOSFET Q8 is in the on state and the first transistor Q10 is in the off state. The energy storage capacitor C4 can store energy in the power supply voltage, and the energy storage capacitor C4 can generate a driving voltage based on the power supply voltage. The driving chip U3 can drive the second MOSFET Q2 to conduct based on the driving voltage, so that the second MOSFET Q2 is used to output a conduction signal.

[0024] When the second MOSFET Q2 outputs a turn-on signal, the main coil 131 generates a stable fourth conversion voltage based on the supply voltage and the turn-on signal. The main coil 131 transmits the fourth conversion voltage to the third coil 134. Based on the fourth conversion voltage, the first transistor Q10 is in the turn-on state, and the first MOSFET Q8 is in the cut-off state. The energy storage capacitor C4 is used to store energy in the fourth conversion voltage, and the energy storage capacitor C4 generates a drive voltage based on the fourth conversion voltage. At this time, since the first MOSFET Q8 is in the cut-off state, the energy storage capacitor C4 cannot receive the supply voltage.

[0025] Furthermore, the driver chip U3 can drive the second MOSFET Q2 to conduct based on the driving voltage, so that the second MOSFET Q2 is used to output a conduction signal. Based on this conduction signal, the main coil 131 can continuously and stably transmit a first conversion voltage of 55V to the first coil 132, and the main coil 131 can continuously and stably transmit a second conversion voltage of 12V to the second coil 133.

[0026] When the LED dimming circuit 10 is working, the power supply module 11 outputs a power supply voltage. At this time, the first MOSFET Q8 is in the on state, and the first transistor Q10 is in the off state. Then, the energy storage capacitor C4 stores energy in the power supply voltage and generates a driving voltage based on the power supply voltage. The driving chip U3 drives the second MOSFET Q2 to turn on based on this driving voltage, and then the second MOSFET Q2 outputs a turn-on signal. When the second MOSFET Q2 outputs a turn-on signal, the main coil 131 generates a stable fourth conversion voltage based on the power supply voltage and the turn-on signal. Then, the main coil 131 transmits the fourth conversion voltage to the third coil 134. Based on the fourth conversion voltage, the first transistor Q10 is in the on state, and the first MOSFET Q8 is in the off state. Then, the energy storage capacitor C4 stores energy in the fourth conversion voltage and generates a driving voltage based on the fourth conversion voltage. At this time, since the first MOSFET Q8 is in the off state, the energy storage capacitor C4 cannot receive the power supply voltage.

[0027] Furthermore, the driver chip U3 can drive the second MOSFET Q2 to conduct based on the driving voltage, thereby the second MOSFET Q2 is used to output a conduction signal. Based on this conduction signal, the main coil 131 can continuously and stably transmit the first conversion voltage of 55V to the first coil 132, and the main coil 131 can continuously and stably transmit the second conversion voltage of 12V to the second coil 133.

[0028] The first coil 132 outputs the first converted voltage, which the first energy storage module 14 stores energy in and generates an LED power supply voltage based on. The LED module 19 receives the LED power supply voltage via the VO pin and uses it to power the LED module 19. The second coil 133 outputs the second converted voltage, which the second energy storage module 15 stores energy in and generates a constant current power supply voltage based on the second converted voltage. The constant current module 18 receives the constant current power supply voltage via the constant current power supply pin 181 and uses it to power the constant current module 18.

[0029] Furthermore, the transformer chip U2 of transformer module 16 can receive the second converted voltage through the IN pin. Transformer chip U2 can perform voltage conversion on the second converted voltage, generating a stable third converted voltage, which is output through the SW pin. The communication chip interface 17 can receive the third converted voltage through the interface power supply pin 171, which can then power the communication chip interface 17. After the communication chip interface 17 is powered on, it can also output the PWM signal from the external communication chip through the PWMCW and PWMWW pins. The constant current module 18 receives the PWM signal through the PWM pin and can stabilize the current of the PWM signal. Thus, the constant current module 18 can generate a constant current control signal, which can be output through the OUT pin. The LED module 19 can receive the control signal through the CW and WW pins, and this control signal can control the color temperature of the LEDs inside the LED module 19.

[0030] This invention provides an LED lamp dimming circuit, which includes a power supply module, a voltage conversion module, a first energy storage module, a second energy storage module, a transformer module, a communication chip interface, a constant current module, and an LED lamp module. The communication chip interface outputs a PWM signal from an external communication chip, and the constant current module stabilizes the current of the PWM signal. The constant current module generates a constant current control signal, which the LED lamp module receives and uses to control the color temperature of the LEDs within the module. The power supply module outputs a supply voltage, which the voltage conversion module converts into stable first and second conversion voltages. The first conversion voltage is used by the first energy storage module to generate the LED lamp supply voltage, and the second conversion voltage is used by the second energy storage module to generate a constant current supply voltage. Thus, the LED lamp supply voltage stably powers the LED lamp module, and the constant current supply voltage stably powers the constant current module. Furthermore, the second conversion voltage is used by the transformer module to generate a stable third conversion voltage, which also stably powers the communication chip interface. Therefore, the supply voltage of this LED dimming circuit is relatively stable and less prone to fluctuations. Because this dimming circuit provides a stable power supply voltage, the communication chip interface, constant current module, and LED module can all operate stably for extended periods, effectively solving the technical problem of existing dimming circuits' inability to operate stably for long periods. Consequently, this LED dimming circuit provides users with excellent lighting and dimming effects. Therefore, products equipped with this LED dimming circuit also offer a better user experience.

[0031] Furthermore, the voltage conversion module can generate a fourth conversion voltage based on the supply voltage and the conduction signal. When the voltage conversion module generates the fourth conversion voltage, the energy storage unit can generate a stable drive voltage based on this fourth conversion voltage, thereby stably driving the drive unit. The energy storage unit can absorb and store energy from the fluctuations in the power supply module during the initial startup phase, avoiding drive instability caused by fluctuations in the power supply module.

[0032] In summary, although the present invention has been disclosed above with reference to preferred embodiments, the above preferred embodiments are not intended to limit the present invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope defined in the claims.

Claims

1. An LED lamp dimming circuit, characterized in that, It includes, The power supply module is used to output the power supply voltage; A switching module, one end of which is connected to the power supply module and the other end of which is connected to the voltage conversion module, is used to control the on / off state of the voltage conversion module; The voltage conversion module is connected to the power supply module and is used to perform voltage conversion operation on the power supply voltage based on the signal of the switching module to generate a stable first conversion voltage and a second conversion voltage. The first energy storage module is used to store energy in the first conversion voltage and generate an LED lamp power supply voltage based on the first conversion voltage. The second energy storage module is used to perform energy storage operation on the second conversion voltage and generate a constant current supply voltage based on the second conversion voltage; A transformer module is used to perform voltage conversion on the second converted voltage to generate a stable third converted voltage; The communication chip interface is used to receive the third conversion voltage, which is used to power the communication chip interface. The communication chip interface is also used to output the PWM signal of an external communication chip. The constant current module is used to receive a constant current supply voltage, which is used to power the constant current module. The constant current module is used to stabilize the current of the PWM signal to generate a constant current control signal. The LED lamp module is used to receive the LED lamp power supply voltage, which is used to power the LED lamp module. The LED lamp module is also used to receive the control signal, which is used to control the color temperature of the LED lamps inside the LED lamp module.

2. The LED lamp dimming circuit according to claim 1, characterized in that, The switching module includes an energy storage unit and a driving unit. The energy storage unit is used to store energy in the power supply voltage and generate a driving voltage based on the power supply voltage. The driving unit is used to turn on based on the driving voltage to generate a turn-on signal. The voltage conversion module is also used to generate a stable fourth conversion voltage based on the supply voltage and the conduction signal, and the energy storage unit is used to perform energy storage operation on the fourth conversion voltage and generate a driving voltage based on the fourth conversion voltage.

3. The LED lamp dimming circuit according to claim 2, characterized in that, The switching module includes a first MOSFET, the energy storage unit includes a driving energy storage capacitor, the driving unit includes a driving chip and a second MOSFET, and the driving chip includes a VDD pin and a GATE pin. The drain of the first MOSFET is connected to the power supply module, the source of the first MOSFET is connected to one end of the driving energy storage capacitor, the other end of the driving energy storage capacitor is grounded, and the gate of the first MOSFET is connected to the voltage conversion module; the GATE pin is connected to the gate of the second MOSFET, the drain of the second MOSFET is connected to the voltage conversion module, and the source of the second MOSFET is grounded.

4. The LED lamp dimming circuit according to claim 3, characterized in that, The switching module includes a first transistor, and the voltage conversion module includes a main coil and a third coil. The main coil is connected to the power supply module and the drain of the second MOS transistor. One end of the third coil is connected to the base of the first transistor. The collector of the first transistor is connected to the gate of the first MOS transistor. The emitter of the first transistor is grounded. The other end of the third coil is grounded.

5. The LED lamp dimming circuit according to claim 4, characterized in that, When the power supply module outputs the power supply voltage, the first MOSFET is in the on state and the first transistor is in the off state. The driving energy storage capacitor is used to store energy in the power supply voltage, and the driving energy storage capacitor generates a driving voltage based on the power supply voltage. The driving chip drives the second MOSFET to conduct based on the driving voltage, so that the second MOSFET is used to output a conduction signal. When the second MOSFET outputs a turn-on signal, the main coil generates a stable fourth conversion voltage based on the supply voltage and the turn-on signal. The main coil transmits the fourth conversion voltage to the third coil. Based on the fourth conversion voltage, the first transistor is in the turn-on state and the first MOSFET is in the cut-off state. The driving energy storage capacitor is used to store energy in the fourth conversion voltage, and the driving energy storage capacitor generates a driving voltage based on the fourth conversion voltage.

6. The LED lamp dimming circuit according to claim 1, characterized in that, The voltage conversion module includes a main coil and a first coil. The first energy storage module includes a first energy storage capacitor. The LED module includes a VO pin. The main coil is connected to the power supply module and is used to receive the power supply voltage. The first coil is connected to the first energy storage capacitor and is used to output the first converted voltage. The first energy storage capacitor is used to store energy in the first converted voltage and generate a stable LED power supply voltage based on the first converted voltage. The VO pin is connected to the first energy storage capacitor and is used to receive the LED power supply voltage.

7. The LED lamp dimming circuit according to claim 6, characterized in that, The voltage conversion module further includes a second coil, the second energy storage module includes a second energy storage capacitor, the constant current module includes a constant current power supply pin, the second coil is connected to the second energy storage capacitor, the second coil is used to output the second conversion voltage, the second energy storage capacitor is used to perform energy storage operation on the second conversion voltage, and generate a stable constant current power supply voltage based on the second conversion voltage, the constant current power supply pin is connected to the second energy storage capacitor, and the constant current power supply pin is used to receive the constant current power supply voltage.

8. The LED lamp dimming circuit according to claim 7, characterized in that, The transformer module includes a transformer chip, which includes an IN pin and an SW pin. The communication chip interface includes an interface power supply pin. The IN pin is connected to the second energy storage capacitor and is used to input a second conversion voltage. The transformer chip is used to perform a voltage conversion operation on the second conversion voltage to generate a stable third conversion voltage. The SW pin is used to output the third conversion voltage and is connected to the interface power supply pin, which is used to receive the third conversion voltage.

9. The LED lamp dimming circuit according to claim 8, characterized in that, The communication chip interface includes a PWMCW pin and a PWMWW pin. The constant current module also includes a PWM pin and an OUT pin. The LED module includes the CW pin and the WW pin. The PWMCW pin and the PWMWW pin are used to output the PWM signal from the external communication chip. The PWM pin is connected to the PWMCW pin and the PWMWW pin and is used to receive the PWM signal. The OUT pin is connected to the CW pin and the WW pin and is used to output the control signal. The CW pin and the WW pin are used to receive the control signal.

10. A circuit board, characterized in that, Includes the LED lamp dimming circuit according to any one of claims 1-9.

Images