Dimming driving circuit, PCB and dimming guide rail power supply
By designing the DIP switch unit and control unit of the dimming drive circuit, the problems of lamps being unable to dim and insufficient power status monitoring were solved, realizing flexible adjustment of lighting effects and power stability and reliability, and reducing maintenance costs.
Patent Information
- Application Number
- CN202520373482.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-04
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2035-03-04
AI Technical Summary
The existing lighting fixtures lack DIP switch dimming function, which makes it impossible to adjust the brightness of the light, affecting the lighting effect and the user's visual health. At the same time, the power status monitoring and fault diagnosis are insufficient, resulting in low maintenance efficiency and increased safety hazards.
A dimming drive circuit was designed, comprising an input processing unit, a control unit, a DIP switch unit, and an output processing unit. The output current is adjusted in a personalized manner through the DIP switch unit, and the power supply status is monitored and dynamically adjusted in real time through the coordinated operation of the control unit and the output processing unit.
It enables flexible adjustment of lighting effects, ensuring that the lighting effect meets user needs, promptly detects power supply problems, improves power supply stability and reliability, and reduces maintenance frequency and costs.
Smart Images
Figure CN223899375U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of driving power supply technology, and in particular to a dimming driving circuit, PCB board and dimming guide rail power supply. Background Technology
[0002] In the field of lighting technology today, there are several limitations in the design and function of luminaire power supplies. These limitations not only affect the overall performance of the luminaires, but also reduce the user experience.
[0003] Specifically, many lighting products on the current market lack the important function of DIP switch dimming, which prevents users from adjusting the brightness of the light according to their actual needs. This not only affects the lighting effect but may also have an adverse effect on the user's visual health.
[0004] Furthermore, the lack of power status monitoring and fault diagnosis functions in existing lighting products means that users cannot receive timely feedback when problems occur, cannot accurately determine the cause of the problem, and therefore cannot implement effective solutions. This not only damages the reliability of the lighting fixtures and reduces the efficiency of maintenance work, but also increases the user's operating costs, and may lead to more serious safety hazards due to the accumulation of faults.
[0005] It is evident that existing technologies still need improvement and enhancement. Utility Model Content
[0006] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a dimming drive circuit, which improves the flexibility of the dimming rail power supply by setting a DIP switch unit, allowing users to adjust the output current according to the application scenario to ensure that the lighting effect meets the requirements.
[0007] To achieve the above objectives, the present invention adopts the following technical solution:
[0008] A dimming drive circuit includes an input processing unit, a control unit, a DIP switch unit, and an output processing unit. The input terminal of the input processing unit is used to connect to an external power supply device, and the output terminal of the input processing unit is inductively 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 power supply terminal of the output processing unit is connected to the power supply terminal of the DIP switch unit, the output terminal of the DIP switch unit is connected to the input terminal of the control unit, and the output terminal of the control unit is connected to the control terminal of the output processing unit.
[0009] In the dimming drive circuit, the input processing unit includes a first filter section, a rectifier section, a second filter section, a flyback section, and the primary side of a transformer T1. 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 second filter section is connected to the input terminal of the primary side of the transformer T1 and the power supply terminal of the flyback section. The output terminal of the flyback section is connected to the input terminal of the primary side of the transformer T1. The output terminal of the primary side of the transformer T1 is connected to the power supply terminal of the flyback section and the input terminal of the output processing unit.
[0010] In the dimming drive circuit, the flyback section includes a buck converter, a transient start-up group, a constant voltage control group, a first control chip U1, and the secondary side of a transformer T1. The primary side of the transformer T1 is inductively connected to the secondary side of the transformer T1. The output terminal of the secondary side of the transformer T1 is connected to the input terminal of the buck converter and the pin Vsans of the first control chip U1, respectively. The output terminal of the buck converter is connected to the pin VCC of the first control chip U1. The second filter section is connected to the pins VCC and Vin of the first control chip U1 through the transient start-up group. The pin OUT of the first control chip U1 is connected to the input terminal of the primary side of the transformer T1 through the constant voltage control group.
[0011] In the dimming drive circuit, the flyback section further includes a sampling group, the input terminal of which is connected to the constant voltage control group, and the output terminal of which is connected to the Isans pin of the first control chip U1.
[0012] In the dimming drive circuit, the control unit includes a control module P1 and a detection unit. The output terminal of the DIP switch unit is connected to pins SET1 and SET2 of the control module P1. Pins TX and RX of the control module P1 are respectively connected to the control terminal of the output processing unit. The input terminal of the detection unit is connected to the output terminal of the rectifier unit, and the output terminal of the detection unit is connected to pin MS of the control module P1.
[0013] In the dimming drive circuit, the DIP switch unit includes a step-down section and a DIP switch section. The input terminal of the step-down section is connected to the output processing unit, the output terminal of the step-down section is connected to the power supply terminal of the DIP switch section, and the output terminal of the DIP switch section is connected to pins SET1 and SET2 of the control module P1.
[0014] In the dimming drive circuit, the output processing unit includes a third side of transformer T1, a third filter section, a voltage regulator section, and a first connector CON1. The third side of transformer T1 is inductively connected to the primary side of transformer T1. The output terminal of the third side of transformer T1 is connected to the input terminal of the third filter section. The output terminal of the third filter section is connected to the input terminals of the voltage regulator section and the step-down section, respectively. The output terminal of the voltage regulator section is connected to the first connector CON1, which is used to connect lighting fixtures. The control terminal of the voltage regulator section is connected to pins TX and RX of the control module P1.
[0015] In the dimming drive circuit, the voltage regulator includes a second control chip U2 and a filter group. The VIN pin of the second control chip U2 is connected to the output terminal of the third filter group. The TX and RX pins of the second control chip U2 are respectively connected to the TX and RX pins of the control module P1. The OUT pin of the second control chip U2 is connected to the first connector CON1 through the filter group.
[0016] The present invention also provides a PCB board, wherein the dimming drive circuit described above is printed on the PCB board.
[0017] This utility model also provides a dimming rail power supply, wherein the dimming rail power supply uses any of the dimming drive circuits described above to achieve working control.
[0018] Beneficial effects:
[0019] This invention provides a dimming drive circuit. By setting up a DIP switch unit, it not only increases the flexibility of the dimming rail during operation but also allows users to personalize the output current according to specific application scenarios, thereby ensuring that the lighting effect of the lighting fixture meets the user's needs. In addition, through the coordinated work of the output processing unit and the control unit, the operating status of the dimming rail power supply can be monitored in real time and dynamically adjusted. This not only achieves light decay compensation but also enables users to promptly identify and resolve potential problems that may occur during the operation of the dimming rail power supply, thereby ensuring its stability, reliability, and efficiency, and reducing the frequency and cost of maintenance. Attached Figure Description
[0020] Figure 1 A circuit block diagram of the dimming drive circuit provided by this utility model;
[0021] Figure 2 The circuit schematic diagram of the input processing unit provided by this utility model;
[0022] Figure 3The circuit schematic diagram of the control unit provided by this utility model;
[0023] Figure 4 The circuit schematic diagram of the DIP switch unit provided by this utility model;
[0024] Figure 5 The circuit schematic diagram of the output processing unit provided by this utility model.
[0025] Explanation of key component symbols: 1-Input processing unit, 11-First filter section, 12-Rectifier section, 13-Second filter section, 14-Flyback section, 141-Buck converter, 142-Transient start-up section, 143-Constant voltage control section, 144-Sampling section, 2-Control unit, 21-Detection section, 3-DIP switch unit, 31-Buck converter, 32-DIP switch section, 4-Output processing unit, 41-Third filter section, 42-Voltage regulator section. Detailed Implementation
[0026] This utility model provides a dimming drive circuit, a PCB board, and a dimming guide rail 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.
[0027] 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.
[0028] Please see Figures 1 to 5 This utility model provides a dimming drive circuit, including an input processing unit, a control unit, a DIP switch unit, and an output processing unit. The input terminal of the input processing unit is used to connect to an external power supply device, and the output terminal of the input processing unit is inductively 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 power supply terminal of the output processing unit is connected to the power supply terminal of the DIP switch unit, the output terminal of the DIP switch unit is connected to the input terminal of the control unit, and the output terminal of the control unit is connected to the control terminal of the output processing unit.
[0029] This utility model discloses a dimming drive circuit. By setting a DIP switch unit, it not only increases the flexibility of the dimming rail during operation, but also allows users to personalize the output current according to specific application scenarios, thereby ensuring that the lighting effect of the lighting fixture meets the user's needs. In addition, through the coordinated work of the output processing unit and the control unit, the operating status of the dimming rail power supply can be monitored in real time and dynamically adjusted. This not only achieves light decay compensation, but also enables users to promptly identify and resolve potential problems that may occur during the operation of the dimming rail power supply, thereby ensuring its stability, reliability, and efficiency, and reducing the frequency and cost of maintenance.
[0030] Further, please refer to Figure 1 and Figure 2 The input processing unit includes a first filter section, a rectifier section, a second filter section, a flyback section, and the primary side of a transformer T1. 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 second filter section is connected to the input terminal of the primary side of the transformer T1 and the power supply terminal of the flyback section. The output terminal of the flyback section is connected to the input terminal of the primary side of the transformer T1. The output terminal of the primary side of the transformer T1 is connected to the power supply terminal of the flyback section and the input terminal of the output processing unit.
[0031] In this embodiment, please refer to Figure 2 The first filtering section includes a first excitation coil LF1 and a first capacitor CX1; the rectifier section includes a rectifier bridge DB1; and the second filtering section includes a second inductor L2, a first capacitor C1, and a third capacitor C3. One end of the first excitation coil LF1 and the first capacitor CX1 are used to connect to an external power supply device, which can be AC mains power. The other end of the first excitation coil LF1 is connected to the input terminal of the rectifier bridge DB1, the anode of the seventh diode D7, and the anode of the eighth diode D8. The output terminal of the rectifier bridge DB1 is connected to one end of the second inductor L2 and one end of the first capacitor C1. The other end of the second inductor L2 and one end of the third capacitor C3 are respectively connected to the power supply terminal of the transient start-up section and the primary side of the transformer T1.
[0032] In this embodiment, the first filtering section consists of a low-pass filter composed of a first excitation coil LF1 and a first capacitor CX1, which effectively filters out noise and interference introduced from the external power supply device, improving the circuit's anti-interference capability and stability. The rectifier section uses a rectifier bridge DB1, which can convert AC power into DC power, providing a stable DC power supply for subsequent circuits. The second filtering section includes a second inductor L2, a first capacitor C1, and a third capacitor C3, which further smooths the DC power supply voltage, reduces voltage fluctuations, and provides a stable DC input for the transient start-up section and the primary side of the transformer T1. Specifically, the second inductor L2 can store electrical energy and release it when needed, which helps to stabilize the output voltage. The first capacitor C1 and the third capacitor C3 can filter out residual AC components and high-frequency noise.
[0033] Further, please refer to Figure 1 and Figure 2 The flyback unit includes a step-down converter, a transient start-up converter, a constant voltage control converter, a first control chip U1, and the secondary side of a transformer T1. The primary side of the transformer T1 is inductively connected to the secondary side of the transformer T1. The output terminal of the secondary side of the transformer T1 is connected to the input terminal of the step-down converter and the pin Vsans of the first control chip U1, respectively. The output terminal of the step-down converter is connected to the pin VCC of the first control chip U1. The second filter unit is connected to the pins VCC and Vin of the first control chip U1 through the transient start-up converter. The pin OUT of the first control chip U1 is connected to the input terminal of the primary side of the transformer T1 through the constant voltage control converter.
[0034] Further, please refer to Figure 1 and Figure 2 The flyback section further includes a sampling group, the input of which is connected to the constant voltage control group, and the output of which is connected to the Isans pin of the first control chip U1.
[0035] In this embodiment, please refer to Figure 3The first control chip U1 is model XP3359. The step-down group includes the fifth diode D5, the forty-third resistor R43, the thirteenth capacitor C13, and the second filter capacitor EC2. The transient startup group includes the first voltage divider block and the second field-effect transistor Q2. The constant voltage control group includes the first field-effect transistor Q1 and the second voltage divider block. The sampling group includes the forty-fifth resistor R45 and the twenty-ninth capacitor C29. The other end of the second inductor L2 is connected to the gate and source of the second field-effect transistor Q2 and the pin Vin of the first control chip U1 through the first voltage divider block. The voltage block includes two sets of parallel resistor groups, each voltage group including several series resistors. The drain of the second field-effect transistor Q2 is connected to the pin VCC of the first control chip U1. The pin 3 of the secondary side of the transformer T1 is connected to the pin Vsns of the first control chip U1 and the fifth diode D5. The positive terminal of the fifth diode D5 is connected to one end of the forty-third resistor R43. The other end of the forty-third resistor R43 is connected to one end of the thirteenth capacitor C13, the positive terminal of the second filter capacitor EC2, and the VCC pin of the first control chip U1. The Drv pin of the first control chip U1 is connected to the gate of the first field-effect transistor Q1 through the second voltage divider block, which includes multiple resistors connected in series. The drain of the first field-effect transistor Q1 is connected to pin 2 on the primary side of the transformer T1. The source of the first field-effect transistor Q1 is connected to one end of the forty-fifth resistor R45. The other end of the forty-fifth resistor R45 is connected to the Isans pin of the first control chip U1 and one end of the twenty-ninth capacitor C29. The positive terminal of the second filter capacitor EC2 and the other end of the twenty-ninth capacitor C29 are grounded.
[0036] In this embodiment, the XP3359 control chip is used to achieve efficient energy conversion, reduce energy loss, and improve the overall circuit efficiency through precise control algorithms. The constant voltage control unit 23, using the combination of the second voltage divider and the first field-effect transistor Q1, ensures stable output voltage, maintaining a constant output voltage even with input voltage fluctuations. The transient startup unit 22, including the second field-effect transistor Q2 and the first voltage divider, can quickly respond to changes in input voltage within a short time, enabling rapid startup of the flyback unit and ensuring circuit stability under transient load changes. The source current of the first field-effect transistor Q1 is monitored via pin CS of the first control chip U1. When the current exceeds a set value, the chip automatically adjusts the control strategy to achieve overcurrent protection and prevent circuit damage.
[0037] Further, please refer to Figure 1 and Figure 3The control unit includes a control module P1 and a detection unit. The output terminal of the DIP switch unit is connected to pins SET1 and SET2 of the control module P1. Pins TX and RX of the control module P1 are respectively connected to the control terminal of the output processing unit. The input terminal of the detection unit is connected to the output terminal of the rectifier unit, and the output terminal of the detection unit is connected to pin MS of the control module P1.
[0038] In this embodiment, the control module P1 is a MCU module, which is composed of the chip BP5016 and its peripheral circuits combined with the chip CS32F031K8U6 and its peripheral circuits.
[0039] In this embodiment, please refer to Figure 2 The detection unit 13 includes a second diode D2, a fourth diode D4, a fourth transistor Q4, and an optocoupler PC1. The other end of the first excitation coil LF1 is connected to the positive terminals of the second diode D2 and the fourth diode D4, respectively. The negative terminals of the second diode D2 and the fourth diode D4 are connected to the base of the fourth transistor Q4, respectively. The collector of the fourth transistor Q4 is connected to one end of the emitter of the optocoupler PC1, and the other end of the emitter of the optocoupler PC1 is connected to the VCC pin of the first control chip U1. The emitter of the fourth transistor Q4 is grounded. The emitter of the optocoupler PC1 is inductively connected to the receiver of the optocoupler PC1. One end of the receiver of the optocoupler PC1 is connected to the output terminal of the step-down unit, and the other end of the receiver of the optocoupler PC1 is connected to the MS pin of the control module P1.
[0040] In this embodiment, the detection unit consists of a second diode D2, a fourth diode D4, a fourth transistor Q4, and an optocoupler PC1. The detection unit can accurately monitor the state of the input circuit and feed it back to the control unit, so that the control unit can dynamically adjust the working state of the circuit to ensure that the circuit operates within a safe range.
[0041] Further, please refer to Figure 1 and Figure 4 The DIP switch unit includes a step-down section and a DIP switch section. The input terminal of the step-down section is connected to the output processing unit, the output terminal of the step-down section is connected to the power supply terminal of the DIP switch section, and the output terminal of the DIP switch section is connected to pins SET1 and SET2 of the control module P1.
[0042] In this embodiment, the step-down unit includes a third control chip U3, which is model BP8501; the DIP switch unit includes a DIP switch SW1 and multiple resistor groups. The DRAIN pin of the third control chip U3 is connected to the output processing unit, and the VOUT pin of the third control chip U3 is used to output a 3.3V voltage to provide a stable operating voltage for the DIP switch unit; pins 1, 2, 3, and 4 of the DIP switch SW1 are respectively connected to the VOUT pin of the third control chip U3; pins 5 and 6 of the DIP switch SW1 are respectively connected to the DEBUG pin of the control module P1 through a resistor group; and pins 7 and 8 of the DIP switch SW1 are respectively connected to the VS pin of the control module P1 through a resistor group.
[0043] In this embodiment, the DIP switch SW1 is a four-position DIP switch. By setting the four-position DIP switch SW1, a variety of setting options are provided to meet different configuration requirements. This not only increases the flexibility of the dimming rail power supply during operation, but also allows users to make personalized adjustments to the output current according to specific application scenarios, thereby ensuring that the lighting effect of the lighting fixtures meets the user's needs.
[0044] Further, please refer to Figure 1 and Figure 5 The output processing unit includes a third side of transformer T1, a third filter section, a voltage regulator section, and a first connector CON1. The third side of transformer T1 is inductively connected to the primary side of transformer T1. The output terminal of the third side of transformer T1 is connected to the input terminal of the third filter section. The output terminal of the third filter section is connected to the input terminals of the voltage regulator section and the step-down section, respectively. The output terminal of the voltage regulator section is connected to the first connector CON1, which is used to connect lighting fixtures. The control terminal of the voltage regulator section is connected to pins TX and RX of the control module P1.
[0045] Further, please refer to Figure 1 and Figure 5 The voltage regulator includes a second control chip U2 and a filter group. The VIN pin of the second control chip U2 is connected to the output terminal of the third filter group. The TX and RX pins of the second control chip U2 are connected to the TX and RX pins of the control module P1, respectively. The OUT pin of the second control chip U2 is connected to the first connector CON1 through the filter group.
[0046] In this embodiment, the third filtering section includes a seventh diode D7 and a filter capacitor bank, which consists of multiple filter capacitors connected in parallel. The second control chip U2 is an XP2116M. The filter bank includes a fourth inductor L4, a twentieth filter capacitor C20, and a ninth excitation coil L9. Pin 6 on the third side of the transformer T1 is connected to the anode of the seventh diode D7, and the cathode of the seventh diode D7 is connected to the anode of the filter capacitor bank. The anode of the filter capacitor bank is also connected to pin DRAIN of the third control chip U3, the anode of the twentieth filter capacitor C20, and one end of the fourth inductor L4. The cathode of the filter capacitor bank is grounded. Pin OUT of the second control chip U2 is connected to one end of the fourth inductor L4, and the other end of the fourth inductor L4 is connected to the cathode of the twentieth filter capacitor C20. The twentieth filter capacitor C20 is also connected to one end of the ninth excitation coil L9, and the other end of the ninth excitation coil L9 is connected to the first connector CON1.
[0047] In this embodiment, the output processing unit achieves efficient power transmission through transformer T1 and effectively filters out noise and interference through the third filter section to ensure power purity. The filter circuit composed of the seventh diode D7 and the filter capacitor group in the third filter section effectively suppresses high-frequency noise and improves electromagnetic compatibility. After the introduction of the voltage regulator, the second control chip U2 precisely adjusts the voltage to maintain output stability, and the voltage is further smoothed through the filter group to improve power quality. The design of the output processing unit also has good expandability and flexibility. The first connector CON1 facilitates the connection of various lighting fixtures. The connection between the control module P1 and the second control chip U2 not only supports remote monitoring but also enables remote control, greatly enhancing the operability and management convenience of the system composed of the power supply and lighting fixtures. This allows the output processing unit to adapt to different application scenarios and meet diverse user needs.
[0048] The present invention also provides a PCB board, wherein the dimming drive circuit described above is printed on the PCB board.
[0049] This utility model also provides a dimming rail power supply, wherein the dimming rail power supply uses any of the dimming drive circuits described above to achieve working control.
[0050] 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, It includes an input processing unit, a control unit, a DIP switch unit, and an output processing unit. The input terminal of the input processing unit is used to connect to an external power supply device, and the output terminal of the input processing unit is inductively 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 power supply terminal of the output processing unit is connected to the power supply terminal of the DIP switch unit, the output terminal of the DIP switch unit is connected to the input terminal of the control unit, and the output terminal of the control unit is connected to the control terminal of the output processing unit.
2. The dimming drive circuit according to claim 1, characterized in that, The input processing unit includes a first filter section, a rectifier section, a second filter section, a flyback section, and the primary side of a transformer T1. 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 second filter section is connected to the input terminal of the primary side of the transformer T1 and the power supply terminal of the flyback section. The output terminal of the flyback section is connected to the input terminal of the primary side of the transformer T1. The output terminal of the primary side of the transformer T1 is connected to the power supply terminal of the flyback section and the input terminal of the output processing unit.
3. The dimming drive circuit according to claim 2, characterized in that, The flyback unit includes a step-down converter, a transient start-up converter, a constant voltage control converter, a first control chip U1, and the secondary side of a transformer T1. The primary side of the transformer T1 is inductively connected to the secondary side of the transformer T1. The output terminal of the secondary side of the transformer T1 is connected to the input terminal of the step-down converter and the pin Vsans of the first control chip U1, respectively. The output terminal of the step-down converter is connected to the pin VCC of the first control chip U1. The second filter unit is connected to the pins VCC and Vin of the first control chip U1 through the transient start-up converter. The pin OUT of the first control chip U1 is connected to the input terminal of the primary side of the transformer T1 through the constant voltage control converter.
4. A dimming drive circuit according to claim 3, characterized in that, The flyback unit also includes a sampling group, the input of which is connected to the constant voltage control group, and the output of which is connected to the Isans pin of the first control chip U1.
5. A dimming drive circuit according to claim 2, characterized in that, The control unit includes a control module P1 and a detection unit. The output terminal of the DIP switch unit is connected to pins SET1 and SET2 of the control module P1. Pins TX and RX of the control module P1 are respectively connected to the control terminal of the output processing unit. The input terminal of the detection unit is connected to the output terminal of the rectifier unit, and the output terminal of the detection unit is connected to pin MS of the control module P1.
6. A dimming drive circuit according to claim 5, characterized in that, The DIP switch unit includes a step-down section and a DIP switch section. The input terminal of the step-down section is connected to the output processing unit, the output terminal of the step-down section is connected to the power supply terminal of the DIP switch section, and the output terminal of the DIP switch section is connected to pins SET1 and SET2 of the control module P1.
7. A dimming drive circuit according to claim 6, characterized in that, The output processing unit includes a third side of transformer T1, a third filter section, a voltage regulator section, and a first connector CON1. The third side of transformer T1 is inductively connected to the primary side of transformer T1. The output terminal of the third side of transformer T1 is connected to the input terminal of the third filter section. The output terminal of the third filter section is connected to the input terminals of the voltage regulator section and the step-down section, respectively. The output terminal of the voltage regulator section is connected to the first connector CON1, which is used to connect lighting fixtures. The control terminal of the voltage regulator section is connected to pins TX and RX of the control module P1.
8. A dimming drive circuit according to claim 7, characterized in that, The voltage regulator includes a second control chip U2 and a filter group. The VIN pin of the second control chip U2 is connected to the output terminal of the third filter group. The TX and RX pins of the second control chip U2 are connected to the TX and RX pins of the control module P1, respectively. The OUT pin of the second control chip U2 is connected to the first connector CON1 through the filter group.
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 dimming rail power supply, characterized in that, The dimming guide rail power supply uses the dimming drive circuit as described in any one of claims 1-8 to achieve working control.