Dimming driving circuit, PCB and circular driving power supply

Abstract

The utility model discloses a dimming driving circuit, a PCB and a circular driving power supply, the circuit comprises an input processing unit, a control unit, a transformer T1 and an output processing unit, and the control unit comprises a high-frequency chip U1; the input end of the input processing unit is used for being connected with an external power supply device, the output end of the input processing unit is connected with a pin VIN of the high-frequency chip U1 and a primary coil of the transformer T1, an auxiliary coil of the transformer T1 is connected with a pin VCC of the high-frequency chip U1, a pin DRAIN of the high-frequency chip U1 is connected with the primary coil of the transformer T1, and a pin DRAIN of the high-frequency chip U1 is connected with the secondary coil of the transformer T1. A secondary coil of the transformer T1 is connected with the input end of the output processing unit, and the output end of the output processing unit is used for being connected with a lighting lamp; the primary coil of the transformer T1 is in induction connection with the secondary coil and the auxiliary coil. According to the dimming driving circuit provided by the utility model, the high-frequency chip U1 is utilized, and when circuit design is carried out, peripheral elements such as inductors and capacitors with smaller sizes can be adopted, so that the volume of the circuit is reduced.

Description

Technical Field

[0001] This utility model relates to the field of drive circuit technology, and in particular to a dimming drive circuit, a PCB board, and a circular drive power supply. Background Technology

[0002] In the field of traditional dimming driver circuit design, due to its relatively low operating frequency, it usually means that key components such as inductors and capacitors with large size must be used. This is because there is a direct relationship between the size of these components and the frequency they can handle. In low-frequency applications, inductors and capacitors require larger physical sizes to store and process energy. Such design choices result in a large overall circuit size, which in turn leads to problems with integration and installation. Due to the limitations of component size, traditional dimming driver circuits often cannot meet the requirements of modern electronic devices for miniaturization and compact design, thus affecting their competitiveness and application range in the market.

[0003] It is evident that existing technologies still need improvement and enhancement. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a dimming drive circuit that utilizes a high-frequency chip U1 to enable the use of smaller peripheral components such as inductors and capacitors during circuit design, thereby reducing the circuit size.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A dimming drive circuit includes an input processing unit, a control unit, a transformer T1, and an output processing unit. The control unit includes a high-frequency chip U1. The input terminal of the input processing unit is used to connect to an external power supply device. The output terminal of the input processing unit is connected to the VIN pin of the high-frequency chip U1 and the primary coil of the transformer T1, respectively. The auxiliary coil of the transformer T1 is connected to the VCC pin of the high-frequency chip U1. The DRAIN pin of the high-frequency chip U1 is connected to the primary coil of the transformer T1. The secondary coil of the transformer T1 is connected to the input terminal of the output processing unit. The output terminal of the output processing unit is used to connect to a lighting fixture. The primary coil of the transformer T1 is inductively connected to the secondary coil and the auxiliary coil, respectively.

[0007] In the dimming drive circuit, the input processing unit includes a first filter section, a rectifier section, and a second filter section. The input terminal of the first filter section is used to connect to an external power supply device. The output terminal of the first filter section is connected to the input terminal of the rectifier section. The output terminal of the rectifier section is connected to the input terminal of the second filter section. The output terminal of the second filter section is connected to the pin VIN of the high-frequency chip U1 and the primary coil of the transformer T1, respectively.

[0008] In the dimming drive circuit, the first filter section includes an overload protection group and a first filter group. The input terminal of the overload protection group is used to connect to an external power supply device, and the output terminal of the overload protection group is connected to the input terminal of the rectifier section through the first filter group.

[0009] In the dimming drive circuit, the second filter section includes a second filter group and an overvoltage protection group. The input terminal of the second filter group is connected to the output terminal of the rectifier section, and the output terminal of the second filter group is connected to the input terminal of the overvoltage protection group. The output terminal of the overvoltage protection group is connected to the pin VIN of the high-frequency chip U1 and the primary coil of the transformer T1, respectively.

[0010] In the dimming drive circuit, the high-frequency chip U1 is model JW1807CH.

[0011] In the dimming drive circuit, the control unit further includes a third filtering section, a clamping section, a detection section, and a setting section. The auxiliary coil of the transformer T1 is connected to the VCC pin of the high-frequency chip U1 through the third filtering section. One end of the clamping section is connected to the primary coil of the transformer T1. The other end of the clamping section is connected to the DRAIN pin of the high-frequency chip U1, one end of the setting section, and one end of the detection section. The other end of the setting section is connected to the SET pin of the high-frequency chip U1. The other end of the detection section is connected to the CS pin of the high-frequency chip U1.

[0012] In the dimming drive circuit, the output processing unit includes a fourth filter section and a flicker removal section. The input terminal of the fourth filter section is connected to the secondary coil of the transformer T1, and the output terminal of the fourth filter section is connected to the input terminal of the flicker removal section. The output terminal of the flicker removal section is used to connect to a lighting fixture.

[0013] In the dimming drive circuit, the flicker removal section includes a first field-effect transistor Q1, a second Zener diode ZD2, a third Zener diode ZD3, a fourth diode D4, a fifth diode D5, an eighth diode D8, a seventeenth resistor R17, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, and a tenth capacitor C10. The drain of the first field-effect transistor Q1, the anode of the third Zener diode ZD3, and the anode of the fifth diode D5 are respectively connected to the output terminal of the fourth filter section. The cathodes of the third Zener diode ZD3 and the fifth diode D5 are respectively connected to the cathodes of the fourth diode D4 and the second Zener diode ZD2. The positive terminals of diode D4 and the second Zener diode ZD2 are respectively connected to one end of the seventeenth resistor R17; the gate of the first field-effect transistor Q1, the negative terminal of the eighth diode D8, and the other end of the seventeenth resistor R17 are respectively connected to one end of the ninth capacitor C9 and one end of the tenth capacitor C10; the source of the first field-effect transistor Q1, the positive terminal of the eighth diode D8, one end of the seventh capacitor C7, and one end of the eighth capacitor C8 are respectively used to connect to lighting fixtures; the other ends of the seventh capacitor C7, the eighth capacitor C8, the ninth capacitor C9, and the tenth capacitor C10 are respectively grounded.

[0014] The present invention also provides a PCB board, wherein the dimming drive circuit described above is printed on the PCB board.

[0015] This utility model also provides a circular driving power supply, which uses any of the dimming driving circuits described above to achieve working control.

[0016] Beneficial effects:

[0017] This utility model provides a dimming drive circuit. By applying a high-frequency chip U1, smaller and higher-performance peripheral components such as inductors and capacitors can be selected during the circuit design process. Without compromising circuit performance, the overall size of the circuit is effectively reduced, the integration of the circuit board is improved, and the overall drive power supply is made lighter. In other words, the dimming drive circuit disclosed in this application can meet the requirements of miniaturization and compact design, thereby enhancing the competitiveness of the drive power supply in the market and the breadth of its application fields. Attached Figure Description

[0018] Figure 1 A circuit block diagram of the dimming drive circuit provided by this utility model;

[0019] Figure 2 The circuit diagram of the dimming drive circuit provided by this utility model;

[0020] Figure 3 A schematic diagram of the structure of the circular drive power supply provided by this utility model.

[0021] Explanation of key component symbols: 1-Input processing unit, 11-First filter section, 12-Rectifier section, 13-Second filter section, 2-Control unit, 21-Third filter section, 22-Clamping section, 23-Detection section, 24-Setting section, 3-Output processing unit, 31-Fourth filter section, 32-Flicker removal section. Detailed Implementation

[0022] This utility model provides a dimming drive circuit, a PCB board, and a circular drive power supply. To make the purpose, technical solution, and effects of this utility model clearer and more explicit, the following describes this utility model in further detail with reference to the accompanying drawings and embodiments.

[0023] In the description of this utility model, it should be understood that the terms "installation" and "connection" should be interpreted broadly, and those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0024] Please see Figure 1 and Figure 2 This utility model provides a dimming drive circuit, including an input processing unit 1, a control unit 2, a transformer T1, and an output processing unit 3. The control unit 2 includes a high-frequency chip U1. The input terminal of the input processing unit 1 is used to connect to an external power supply device. The output terminal of the input processing unit 1 is connected to the pin VIN of the high-frequency chip U1 and the primary coil of the transformer T1, respectively. The auxiliary coil of the transformer T1 is connected to the pin VCC of the high-frequency chip U1. The pin DRAIN of the high-frequency chip U1 is connected to the primary coil of the transformer T1. The secondary coil of the transformer T1 is connected to the input terminal of the output processing unit 3. The output terminal of the output processing unit 3 is used to connect to a lighting fixture. The primary coil of the transformer T1 is inductively connected to the secondary coil and the auxiliary coil, respectively.

[0025] This application discloses a dimming drive circuit. By using a high-frequency chip U1, smaller and higher-performance peripheral components such as inductors and capacitors can be selected during the circuit design process. Without compromising circuit performance, the overall size of the circuit is effectively reduced, the integration of the circuit board is improved, and the overall drive power supply is made lighter. In other words, the dimming drive circuit disclosed in this application can meet the requirements of miniaturization and compact design, thereby enhancing the competitiveness of the drive power supply in the market and the breadth of its application fields.

[0026] In this embodiment, the external power supply device is AC mains power.

[0027] Further, please refer to Figure 1 and Figure 2 The input processing unit 1 includes a first filter section 11, a rectifier section 12, and a second filter section 13. The input terminal of the first filter section 11 is used to connect to an external power supply device. The output terminal of the first filter section 11 is connected to the input terminal of the rectifier section 12. The output terminal of the rectifier section 12 is connected to the input terminal of the second filter section 13. The output terminal of the second filter section 13 is connected to the pin VIN of the high-frequency chip U1 and the primary coil of the transformer T1, respectively.

[0028] Further, please refer to Figure 2 The first filter unit 11 includes an overload protection group and a first filter group. The input terminal of the overload protection group is used to connect to an external power supply device, and the output terminal of the overload protection group is connected to the input terminal of the rectifier unit 12 through the first filter group.

[0029] Further, please refer to Figure 2 The second filter section 13 includes a second filter group and an overvoltage protection group. The input terminal of the second filter group is connected to the output terminal of the rectifier section 12, and the output terminal of the second filter group is connected to the input terminal of the overvoltage protection group. The output terminal of the overvoltage protection group is connected to the pin VIN of the high-frequency chip U1 and the primary coil of the transformer T1, respectively.

[0030] In this embodiment, please refer to Figure 2The overload protection group includes a fuse F1 and a first varistor MOV1; the first filter group includes a first excitation coil LF1 and a first capacitor CX1; the rectifier section 12 includes a rectifier bridge DB1; the second filter group includes a first inductor L1, a first resistor R1, a first capacitor C1, and a second capacitor C2; the overvoltage protection group includes a second varistor MOV2, a third capacitor C3, a second resistor R2, a third resistor R3, and a fourth resistor R4; one end of the fuse F1, one end of the first varistor MOV1, and one end of the first excitation coil LF1 are respectively used to connect to an external power supply device; the other end of the fuse F1 is connected to the other end of the first varistor MOV1 and one end of the first excitation coil LF1; the first excitation coil LF1... The other end is connected to the input terminal of the rectifier bridge BD1 through the first capacitor CX1; the output terminal of the rectifier bridge BD1 is connected to one end of the first inductor L1, one end of the first resistor R1, and one end of the first capacitor C1, respectively; the other end of the first inductor L1, the other end of the first resistor R1, one end of the second capacitor C2, and one end of the second varistor MOV2 are respectively connected to the primary coil of the transformer T1 and the pin VIN of the high-frequency chip U1; the second resistor R2, the third resistor R3, and the fourth resistor R4 are respectively connected in parallel with one end of the third capacitor C3; the other end of the second varistor MOV2, the other end of the first capacitor C1, the other end of the second capacitor C2, and the other end of the third capacitor C3 are respectively grounded.

[0031] In this embodiment, firstly, the power supplied by the external power supply device is preliminarily filtered by the first filter unit 11, which not only effectively removes high-frequency noise and interference from the power supply, but also significantly improves the purity of the power supply, laying a solid foundation for the stable operation of the subsequent circuit. Furthermore, the overload protection group included in the first filter unit 11, with fuse F1 and first varistor MOV1, can respond quickly when the circuit experiences an overload, promptly cutting off the power supply and preventing circuit damage due to overload. Secondly, the rectifier unit 12 uses a high-performance rectifier bridge DB1 to efficiently convert AC power into DC power, providing power to the high-frequency chip U1 and the transformer... Transformer T1 provides a continuous and stable DC power supply. Furthermore, the second filter section 13 performs more refined filtering on the rectified DC power, further removing ripple and residual AC components from the DC power, ensuring that the high-frequency chip U1 and transformer T1 can receive an extremely pure and stable DC power supply. The overvoltage protection group included in the second filter section 13 effectively copes with possible overvoltage situations in the circuit through the synergistic effect of the second varistor MOV2, the third capacitor C3, the second resistor R2, the third resistor R3, and the fourth resistor R4, protecting the high-frequency chip U1 and transformer T1 from damage.

[0032] Further, please refer to Figure 1 and Figure 2 The high-frequency chip U1 is model JW1807CH; the control unit 2 also includes a third filter section 21, a clamping section 22, a detection section 23, and a setting section 24. The auxiliary coil of the transformer T1 is connected to the VCC pin of the high-frequency chip U1 through the third filter section 21. One end of the clamping section 22 is connected to the primary coil of the transformer T1. The other end of the clamping section 22 is connected to the DRAIN pin of the high-frequency chip U1, one end of the setting section 24, and one end of the detection section 23. The other end of the setting section 24 is connected to the SET pin of the high-frequency chip U1. The other end of the detection section 23 is connected to the CS pin of the high-frequency chip U1.

[0033] In this embodiment, please refer to Figure 2 The third filtering section 21 includes a second diode D2, a seventh resistor R7, and a third filtering capacitor CE3; the clamping section 22 includes a ninth resistor R9, a first diode D1, an eighth resistor R8, and a fourth capacitor C4; the detection section 23 includes a twelfth resistor R12, a thirteenth resistor R13, and a fourteenth resistor R14; and the setting section 24 includes a sixth capacitor C6 and an eleventh resistor R11. The auxiliary coil of the transformer T1 is connected to the positive terminal of the second diode D2, and the negative terminal of the second diode D2 is connected to one end of the seventh resistor R7. The other end of the seventh resistor R7 is connected to the VCC pin of the high-frequency chip U1 and the positive terminal of the third filtering capacitor CE3, respectively. One end of the eighth resistor R8 and one end of the fourth capacitor C4 are respectively connected to the primary winding of the transformer T1. The circuit is connected in a loop. The other end of the eighth resistor R8 and the other end of the fourth capacitor C4 are respectively connected to the negative terminal of the first diode D1. The positive terminal of the first diode D1 is connected to the DRAIN pin of the high-frequency chip U1 and one end of the sixth capacitor C6 through the ninth resistor R9. The other end of the sixth capacitor C6 is connected to one end of the eleventh resistor R11, one end of the twelfth resistor R12, one end of the thirteenth resistor R13, and one end of the fourteenth resistor R14. The other end of the eleventh resistor R11 is connected to the SET pin of the high-frequency chip U1. The other ends of the twelfth resistor R12, the thirteenth resistor R13, and the fourteenth resistor R14 are respectively connected to the CS pin of the high-frequency chip U1.

[0034] In this embodiment, the voltage output from the auxiliary coil of transformer T1 is filtered by the third filter section 21. The third filter section 21 consists of the second diode D2, the seventh resistor R7, and the third filter capacitor CE3. This combination not only effectively filters out noise and interference in the voltage but also ensures that the pin VCC of the high-frequency chip U1 can obtain a stable and clean power supply voltage. Secondly, the clamping section 22 consists of the ninth resistor R9, the first diode D1, the eighth resistor R8, and the fourth capacitor C4. It can effectively limit the voltage peak of the primary coil of transformer T1, preventing damage to circuit components due to excessive voltage. In addition, the clamping section 22 is also closely connected to the pin DRAIN of the high-frequency chip U1 to realize the control of the chip's operating status. Real-time monitoring and protection ensure stable operation of the chip under extreme conditions. Furthermore, the detection unit 23, composed of the twelfth resistor R12, the thirteenth resistor R13, and the fourteenth resistor R14, can perform high-precision detection of current or voltage in the circuit. The detection results are fed back to the chip in real time via the CS pin of the high-frequency chip U1. The chip quickly adjusts its operating state based on these feedback signals, ensuring optimal performance under various conditions. Finally, the setting unit 24, composed of the sixth capacitor C6 and the eleventh resistor R11, provides a precise setting signal to the SET pin of the high-frequency chip U1 through the combination of these components. This allows the circuit to be flexibly adjusted according to different application requirements, improving its performance in complex environments.

[0035] Further, please refer to Figure 1 and Figure 2 The output processing unit 3 includes a fourth filter section 31 and a flicker removal section 32. The input terminal of the fourth filter section 31 is connected to the secondary coil of the transformer T1, and the output terminal of the fourth filter section 31 is connected to the input terminal of the flicker removal section 32. The output terminal of the flicker removal section 32 is used to connect to a lighting fixture.

[0036] In this embodiment, please refer to Figure 2 The fourth filter section 31 includes a third diode D3, a fifteenth resistor R15, a fifth capacitor C5, and a first filter capacitor CE1. The positive terminal of the third diode D3 and one end of the fifteenth resistor R15 are respectively connected to the secondary coil of the transformer T1. The other end of the fifteenth resistor R15 is connected to one end of the fifth capacitor C5. The other end of the fifth capacitor C5 and the negative terminal of the third diode D3 are respectively connected to the positive terminal of the first filter capacitor CE1 and the drain of the first field-effect transistor Q1. The negative terminal of the first filter capacitor CE1 is grounded.

[0037] Further, please refer to Figure 2The flicker removal section 32 includes a first field-effect transistor Q1, a second Zener diode ZD2, a third Zener diode ZD3, a fourth diode D4, a fifth diode D5, an eighth diode D8, a seventeenth resistor R17, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, and a tenth capacitor C10. The drain of the first field-effect transistor Q1, the anode of the third Zener diode ZD3, and the anode of the fifth diode D5 are respectively connected to the output terminal of the fourth filter section 31. The cathodes of the third Zener diode ZD3 and the fifth diode D5 are respectively connected to the cathodes of the fourth diode D4 and the second Zener diode ZD2. The fourth diode D4... The positive terminals of capacitor 4 and the second Zener diode ZD2 are respectively connected to one end of the seventeenth resistor R17; the gate of the first field-effect transistor Q1, the negative terminal of the eighth diode D8, and the other end of the seventeenth resistor R17 are respectively connected to one end of the ninth capacitor C9 and one end of the tenth capacitor C10; the source of the first field-effect transistor Q1, the positive terminal of the eighth diode D8, one end of the seventh capacitor C7, and one end of the eighth capacitor C8 are respectively used to connect to lighting fixtures; the other ends of the seventh capacitor C7, the eighth capacitor C8, the ninth capacitor C9, and the tenth capacitor C10 are respectively grounded.

[0038] In this embodiment, the flicker removal unit 32 can stabilize and regulate the input voltage to reduce or eliminate flicker caused by power fluctuations or switching actions, thereby improving lighting quality and protecting the user's eyesight. Specifically, the fourth filter unit 31 first filters the voltage output from the secondary coil of transformer T1 to remove high-frequency noise and interference, and then transmits the filtered voltage to the flicker removal unit 32. The flicker removal unit 32 utilizes the first field-effect transistor Q1, Zener diodes ZD2 and ZD3, diodes D4, D5, and D8, as well as resistor R17 and capacitors C7, C8, C9, and C10, etc. The components construct a complex voltage regulation and stabilization circuit. This circuit can automatically adjust the output voltage according to changes in the input voltage, keeping it within a relatively stable range, thereby effectively reducing the occurrence of flicker. In addition, the circuit design of the flicker removal unit 32 also fully considers safety and stability. For example, by using resistor R17 and capacitors C9 and C10 together, the gate voltage of the first field-effect transistor Q1 is smoothly regulated, avoiding circuit instability or damage caused by sudden changes in gate voltage. At the same time, the parallel use of multiple capacitors also improves the circuit's anti-interference ability and stability.

[0039] The present invention also provides a PCB board, wherein the dimming drive circuit described above is printed on the PCB board.

[0040] Please see Figure 3The present invention also provides a circular driving power supply, wherein the circular driving power supply uses any of the dimming driving circuits described above to achieve working control.

[0041] It is understood that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of this utility model, and all such substitutions or changes should fall within the protection scope of this utility model.

Claims

1. A dimming drive circuit, characterized in that, The system includes an input processing unit, a control unit, a transformer T1, and an output processing unit. The control unit includes a high-frequency chip U1. The input terminal of the input processing unit is used to connect to an external power supply device. The output terminal of the input processing unit is connected to the VIN pin of the high-frequency chip U1 and the primary coil of the transformer T1, respectively. The auxiliary coil of the transformer T1 is connected to the VCC pin of the high-frequency chip U1. The DRAIN pin of the high-frequency chip U1 is connected to the primary coil of the transformer T1. The secondary coil of the transformer T1 is connected to the input terminal of the output processing unit. The output terminal of the output processing unit is used to connect to a lighting fixture. The primary coil of the transformer T1 is inductively connected to the secondary coil and the auxiliary coil, respectively.

2. The dimming drive circuit according to claim 1, characterized in that, The input processing unit includes a first filter section, a rectifier section, and a second filter section. The input terminal of the first filter section is used to connect to an external power supply device. The output terminal of the first filter section is connected to the input terminal of the rectifier section. The output terminal of the rectifier section is connected to the input terminal of the second filter section. The output terminal of the second filter section is connected to the pin VIN of the high-frequency chip U1 and the primary coil of the transformer T1, respectively.

3. The dimming drive circuit according to claim 2, characterized in that, The first filtering unit includes an overload protection group and a first filtering group. The input terminal of the overload protection group is used to connect to an external power supply device, and the output terminal of the overload protection group is connected to the input terminal of the rectifier unit through the first filtering group.

4. A dimming drive circuit according to claim 2, characterized in that, The second filtering section includes a second filter group and an overvoltage protection group. The input terminal of the second filter group is connected to the output terminal of the rectifier section, and the output terminal of the second filter group is connected to the input terminal of the overvoltage protection group. The output terminal of the overvoltage protection group is connected to the pin VIN of the high-frequency chip U1 and the primary coil of the transformer T1, respectively.

5. A dimming drive circuit according to claim 1, characterized in that, The high-frequency chip U1 is model JW1807CH.

6. A dimming drive circuit according to claim 5, characterized in that, The control unit further includes a third filtering section, a clamping section, a detection section, and a setting section. The auxiliary coil of the transformer T1 is connected to the VCC pin of the high-frequency chip U1 through the third filtering section. One end of the clamping section is connected to the primary coil of the transformer T1. The other end of the clamping section is connected to the DRAIN pin of the high-frequency chip U1, one end of the setting section, and one end of the detection section. The other end of the setting section is connected to the SET pin of the high-frequency chip U1. The other end of the detection section is connected to the CS pin of the high-frequency chip U1.

7. A dimming drive circuit according to claim 1, characterized in that, The output processing unit includes a fourth filtering section and a flicker removal section. The input terminal of the fourth filtering section is connected to the secondary coil of the transformer T1, and the output terminal of the fourth filtering section is connected to the input terminal of the flicker removal section. The output terminal of the flicker removal section is used to connect to a lighting fixture.

8. A dimming drive circuit according to claim 7, characterized in that, The flicker removal section includes a first field-effect transistor Q1, a second Zener diode ZD2, a third Zener diode ZD3, a fourth diode D4, a fifth diode D5, an eighth diode D8, a seventeenth resistor R17, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, and a tenth capacitor C10. The drain of the first field-effect transistor Q1, the anode of the third Zener diode ZD3, and the anode of the fifth diode D5 are respectively connected to the output terminal of the fourth filter section. The cathodes of the third Zener diode ZD3 and the fifth diode D5 are respectively connected to the cathodes of the fourth diode D4 and the second Zener diode ZD2. The anode of the fourth diode D4... The positive terminal of the first field-effect transistor Q1 and the negative terminal of the second Zener diode ZD2 are respectively connected to one end of the seventeenth resistor R17; the gate of the first field-effect transistor Q1, the negative terminal of the eighth diode D8, and the other end of the seventeenth resistor R17 are respectively connected to one end of the ninth capacitor C9 and one end of the tenth capacitor C10; the source of the first field-effect transistor Q1, the positive terminal of the eighth diode D8, one end of the seventh capacitor C7, and one end of the eighth capacitor C8 are respectively used to connect to lighting fixtures; the other ends of the seventh capacitor C7, the eighth capacitor C8, the ninth capacitor C9, and the tenth capacitor C10 are respectively grounded.

9. A PCB board, characterized in that, The PCB board is printed with a dimming drive circuit as described in any one of claims 1-8.

10. A circular driving power supply, characterized in that, The circular drive power supply uses the dimming drive circuit as described in any one of claims 1-8 to achieve operation control.

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