A high-input, low-output dimming control system for series-connected high-voltage dimmers

Abstract

This utility model discloses a high-input, low-output dimming control system with a series high-voltage dimmer. It includes a transformer connected to AC power. The live wire input of the transformer is connected to a high-voltage dimmer for phase-cut dimming. The transformer output is sequentially connected to a rectifier circuit, a voltage divider detection circuit for detecting the dimming voltage of the high-voltage dimmer, a central control circuit for receiving the detected voltage signal and outputting a dimming signal based on the detected voltage signal, a constant current boost circuit for adjusting the output power current based on the dimming signal, and an LED driver circuit for driving the LED light panel based on the output power current. The rectifier circuit is connected to a step-down circuit that supplies power to the central control circuit. The rectifier circuit is connected to the constant current boost circuit for power supply, and the constant current boost circuit is connected to the step-down circuit. The high-voltage dimmer ensures that the LED driver is always energized during dimming control, keeping the central control circuit in the LED driver energized to accurately identify the dimming command of the high-voltage dimmer.

Description

[Technical Field]

[0001] This utility model relates to a high-input, low-output dimming control system for a series high-voltage dimmer. [Background Technology]

[0002] In existing LED lighting fixtures, the dimming signal is usually input by quickly turning the wall switch on or off to control the LED lights and to enable multi-level dimming. This has the problem of affecting the power supply stability of the LED driver and LED board, causing the LED driver to fail to receive power and thus fail to recognize the dimming signal from the wall switch. [Utility Model Content]

[0003] This invention overcomes the shortcomings of the prior art and provides a high-input, low-output dimming control system for a series high-voltage dimmer.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A high-input, low-output dimming control system with a series high-voltage dimmer is characterized by comprising: a transformer connected to AC power for transforming AC power; a high-voltage dimmer for phase-cut dimming connected to the live wire input of the transformer; a rectifier circuit for converting AC power to DC power, a voltage divider detection circuit for detecting the dimming voltage of the high-voltage dimmer, a central control circuit for receiving the detection voltage signal from the voltage divider detection circuit and outputting a dimming signal based on the detected voltage signal, a constant current boost circuit for adjusting the output power current based on the dimming signal, and an LED driver circuit for driving the LED light board based on the power current output by the constant current boost circuit; a step-down circuit connected to the rectifier circuit for stepping down DC power and supplying power to the central control circuit; the rectifier circuit and the constant current boost circuit are connected for power supply; and the constant current boost circuit and the step-down circuit are connected for low-voltage compensation of the step-down circuit.

[0006] The high-input, low-output dimming control system of the series high-voltage dimmer described above is characterized in that: the high-voltage dimmer includes a bidirectional thyristor TRIAC1, the T2 terminal of the bidirectional thyristor TRIAC1 is connected to one end of capacitor C4, one end of adjustable resistor R3, and the live wire respectively, the other end of capacitor C4 is connected to the T1 terminal of the bidirectional thyristor TRIAC1, the live wire input terminal of the transformer, and one end of capacitor C3 respectively, the other end of capacitor C3 is connected to one end of resistor R4 and one end of trigger diode DB3 respectively, the other end of resistor R4 is connected to the other end of adjustable resistor R3, and the other end of trigger diode DB3 is connected to the control terminal of the bidirectional thyristor TRIAC1.

[0007] The high-input, low-output dimming control system of the series high-voltage dimmer described above is characterized in that: a fuse is connected between the T2 terminal of the bidirectional thyristor TRIAC1 and the live wire.

[0008] The high-input, low-output dimming control system of the series high-voltage dimmer described above is characterized in that: the voltage divider detection circuit includes a Zener diode ZD1, the negative terminal of the Zener diode ZD1 is connected to the central control circuit, one end of capacitor C27, one end of resistor R19, and one end of resistor R20 through resistor R22, the positive terminal of Zener diode ZD1, the other end of capacitor C27, and the other end of resistor R20 are respectively grounded, and the other end of resistor R19 is connected to the rectifier circuit.

[0009] The high-input, low-output dimming control system of the series high-voltage dimmer described above is characterized in that: the central control circuit includes a control chip U2, pin 1 of the control chip U2 is connected to one end of capacitor C21 and the step-down circuit respectively, the other end of capacitor C21 is grounded, pin 4 of the control chip U2 is connected to the voltage divider detection circuit, pin 5 of the control chip U2 is connected to the constant current boost circuit, and pin 8 of the control chip U2 is grounded.

[0010] The high-input, low-output dimming control system of the series high-voltage dimmer described above is characterized in that: the constant current boost circuit includes a boost chip U3, pin 1 of the boost chip U3 is grounded through capacitor C4, pin 2 of the boost chip U3 is grounded through resistor R4, pin 3 of the boost chip U3 is connected to one end of resistor R4, one end of capacitor C26, and one end of resistor R1 respectively, the other end of resistor R4 and the other end of capacitor C26 are grounded respectively, the other end of resistor R1 is connected to the central control circuit, pin 4 of the boost chip U3 is connected to one end of resistor R3 and one end of capacitor C3 respectively, the other end of resistor R3, The other end of capacitor C3 is grounded. Pin 5 of boost chip U3 is connected to one end of capacitor C6 and one end of resistor R8. The other end of capacitor C6 is grounded. The other end of resistor R8 is grounded through capacitor C5. Pin 11 of boost chip U3 is grounded. Pin 6 of boost chip U3 is connected to one end of resistor R12 and one end of resistor R11. The other end of resistor R12 is grounded. The other end of resistor R11 is connected to the LED driver circuit, the positive terminal of diode D5, one end of capacitor C31, and the negative terminal of diode D1. The negative terminal of diode D5 is connected to the buck circuit and one end of resistor R10. The other end of resistor R10 is connected to one end of capacitor C9 and pin 9 of boost chip U3. The other end of capacitor C9 is grounded. The other end of capacitor C31 is connected to one end of resistor R32 and one end of resistor R31. The other end of resistor R32 is connected to the other end of resistor R31, the positive terminal of diode D1, one end of inductor L1, the drain terminal of MOSFET M1, and one end of capacitor C7. The other end of inductor L1 is connected to one end of capacitor C2, the positive terminal of electrolytic capacitor C1, and the rectifier circuit. The other end of capacitor C2 and the negative terminal of electrolytic capacitor EC1 are grounded. The source terminal of MOSFET M1 is connected to... The other end of capacitor C7, one end of resistor R16, one end of resistor R18, one end of resistor RC1, one end of resistor RC2, and one end of resistor RC3 are connected. The other ends of resistor RC1, RC2, and RC3 are grounded respectively. The other end of resistor R18 is connected to pin 8 of boost chip U3 and one end of capacitor C14. The other end of capacitor C14 is grounded. The other end of resistor R16 is connected to the gate of MOSFET M1 and one end of resistor R17. The other end of resistor R17 is connected to pin 10 of boost chip U3. Pin 7 of boost chip U3 is connected to the LED driver circuit.

[0011] The high-input, low-output dimming control system of the series high-voltage dimmer described above is characterized in that: the step-down circuit includes a step-down chip U1, pin 3 of the step-down chip U1 is connected to one end of capacitor C23, the positive terminal of electrolytic capacitor E1, one end of resistor R26, one end of resistor R2, and the negative terminal of diode D6 respectively; the positive terminal of diode D6 is connected to the rectifier circuit; the other end of resistor R26 is connected to the other end of resistor R2, the negative terminal of Zener diode ZD2, and the constant current boost circuit respectively; the positive terminal of Zener diode ZD2 is grounded; the negative terminal of electrolytic capacitor E1, the other end of capacitor C23, and pin 2 of step-down chip U1 are grounded respectively; pin 1 of step-down chip U1 is connected to the positive terminal of electrolytic capacitor EC2, one end of capacitor C24, and the central control circuit respectively; the negative terminal of electrolytic capacitor E2 and the other end of capacitor C24 are grounded respectively.

[0012] The high-input, low-output dimming control system of the series high-voltage dimmer described above is characterized in that: the LED driving circuit includes a Zener diode ZD3, the negative terminal of which is connected to a constant current boost circuit, one end of resistor R30, the positive terminals of electrolytic capacitors EC6 and EC7, one end of capacitor C8, one end of resistor R14, the positive terminal of electrolytic capacitor C13, one end of resistor R16, and the LED+ terminal of the LED board positive terminal; the positive terminal of Zener diode ZD3, the other end of resistor R30, the negative terminals of electrolytic capacitors EC6 and EC7, and the other end of capacitor C8 are grounded; and the other end of resistor R14 is connected to... One end of resistor R15, one end of capacitor C12, one end of resistor RB1, one end of resistor RB2, one end of resistor RB3, one end of resistor RB4, the positive terminal of diode D4, one end of resistor R5, one end of resistor R6, and one end of resistor R7 are connected. The other end of resistor R15 is connected to the constant current boost circuit. The other ends of capacitor C12, resistor RB1, resistor RB2, resistor RB3, and resistor RB4, and the negative terminal of diode D4 are grounded respectively. The other end of resistor R5 is connected to the negative terminal of electrolytic capacitor C13, the other end of resistor R16, the other end of resistor R6, the other end of resistor R7, and the negative terminal of LED light board LED-.

[0013] The high-input, low-output dimming control system of the series high-voltage dimmer described above is characterized in that: the rectifier circuit includes a rectifier BD1, pin 1 of rectifier BD1 is connected to one end of capacitor C11, one end of capacitor CX12, one end of capacitor X2, and pin 1 of inductor LF1 respectively; pin 2 of rectifier BD1 is connected to the other end of capacitor C11, the other end of capacitor CX12, the other end of capacitor X2, and pin 2 of inductor LF1 respectively; pin 3 of inductor LF1 is connected to one end of capacitor C10, one end of capacitor CX1, one end of capacitor X1, and a transformer respectively; pin 4 of inductor LF1 is connected to the other end of capacitor C10, the other end of capacitor CX1, and the other end of capacitor CX1 respectively. One end of the capacitor X1 is connected to the transformer. Pin 3 of rectifier BD1 is grounded. Pin 4 of rectifier BD1 is connected to the positive terminals of diodes D3 and D2 respectively. The negative terminal of diode D2 is connected to the positive terminal of electrolytic capacitor EC1, one end of resistor R21, and the voltage divider detection circuit respectively. The negative terminal of electrolytic capacitor EC1 and the other end of resistor R21 are grounded respectively. The other end of diode D3 is connected to one end of resistor R13, the positive terminal of electrolytic capacitor EC2, one end of capacitor C25, the constant current boost circuit, and the buck circuit respectively. The other end of resistor R13 and the negative terminal of electrolytic capacitor EC2 and the other end of capacitor C25 are grounded respectively.

[0014] The beneficial effects of this utility model are:

[0015] This invention connects a transformer to the power input terminal of an LED driver and a high-voltage dimmer for wall-mounted dimming to the live wire input terminal of the transformer. The high-voltage dimmer sends a dimming signal to the LED driver. The high-voltage dimmer is set up so that the LED driver does not need to be powered off, ensuring that the LED driver is always powered on during dimming control. This keeps the central control circuit in the LED driver powered on to accurately identify the dimming command from the high-voltage dimmer. At the same time, the constant current boost circuit in the LED driver provides stable power to the LED light board, preventing the LED light board from flickering. [Image Description]

[0016] Figure 1 This is a schematic diagram of the present invention;

[0017] Figure 2 This is the circuit diagram of the high-voltage dimmer of this utility model;

[0018] Figure 3 The diagram shows the circuit diagrams of this utility model. [Detailed Implementation]

[0019] The technical solutions in the embodiments of this utility model will now be clearly and completely described in conjunction with the accompanying drawings.

[0020] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this utility model are only used to explain the relative positional relationship and movement of the components in a specific posture (as shown in the attached figure). If the specific posture changes, the directional indication will also change accordingly. Furthermore, descriptions involving "preferred," "second-best," etc., in this utility model are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined as "preferred" or "second-best" may explicitly or implicitly include at least one of those features.

[0021] like Figure 1-3 As shown, a high-input, low-output dimming control system with a series high-voltage dimmer includes a transformer 1 connected to AC power for stepping down the AC power. The live wire input of the transformer 1 is connected to a high-voltage dimmer 2 for phase-cut dimming. The output of the transformer 1 is an LED driver. Specifically, the output of the transformer 1 is sequentially connected to a rectifier circuit 3 for converting AC power to DC power, a voltage divider detection circuit 4 for detecting the dimming voltage of the high-voltage dimmer 2, a central control circuit 5 for receiving the detection voltage signal from the voltage divider detection circuit 4 and outputting a dimming signal according to the detected voltage signal, a constant current boost circuit 6 for adjusting the output power current according to the dimming signal, and an LED driver circuit 7 for driving the LED board according to the power current output by the constant current boost circuit 6. The rectifier circuit 3 is connected to a step-down circuit 8 for stepping down the DC power and supplying power to the central control circuit 5. The rectifier circuit 3 is connected to the constant current boost circuit 6 for power supply, and the constant current boost circuit 6 is connected to the step-down circuit 8 for low-voltage compensation of the step-down circuit 8.

[0022] In practical applications, alternating current (AC) is transformed by transformer 1 and output to the LED driver. The rectifier circuit 3 in the LED driver converts the input AC to DC and supplies power to the constant current boost circuit 6 and the DC-DC buck circuit 8, respectively. The constant current boost circuit 6 boosts the DC and outputs it to the LED driver circuit 7, which then drives the LED panel to emit light. During this process, the DC-DC buck circuit 8 steps down the DC and supplies power to the central control circuit 5, enabling it to operate. During dimming, the high-voltage dimmer 2 inputs a dimming signal. The voltage divider detection circuit 4 calculates the voltage output of the rectifier circuit 3 and sends the calculated voltage signal to the central control circuit 5. The central control circuit 5 outputs a dimming signal to the constant current boost circuit 6 based on the calculated voltage signal. The constant current boost circuit 6 then adjusts the voltage and circuit of the LED driver circuit 7 according to the dimming signal, thereby adjusting the brightness of the LED panel. When a low-brightness dimming signal is input to the high-voltage dimmer 2, the constant current boost circuit 6 provides low-voltage compensation power to the DC-DC buck circuit 8, ensuring a stable power supply from the DC-DC buck circuit 8 to the central control circuit 5, thus keeping the central control circuit 5 powered on. This ensures that the LED driver remains energized throughout the dimming process, allowing the central control circuit within the LED driver to accurately recognize the dimming command from the high-voltage dimmer. Simultaneously, the constant current boost circuit in the LED driver provides a stable power supply to the LED light panel, preventing light flickering issues.

[0023] In this case, one high-voltage dimmer 2 can control the LED driver of one LED light panel, or one high-voltage dimmer 2 can control the LED driver of multiple LED light panels. In one-to-many control, only one high-voltage dimmer needs to be connected at the front end, and multiple LED drivers and LED light panels need to be connected at the back end of the transformer to realize the function of dimming multiple scenes at the same time.

[0024] like Figure 2 As shown, during dimming, the sliding key on the high-voltage dimmer 2 is slidable, specifically the adjustable resistor R3. The resistance value of the adjustable resistor R3 is adjusted, thereby adjusting the phase cut of the TRIAC and inputting a dimming signal to the LED driver.

[0025] like Figure 3As shown, after power is applied, the low-frequency transformer TRANS in transformer 1 transforms the AC power and outputs it to the rectifier circuit 3. The inductor LF1, rectifier BD1 and other components of the rectifier circuit 3 convert the transformed AC power into DC power and output it to the constant current boost circuit 6 and the buck circuit 28 respectively. The constant current boost circuit 6 supplies power to the LED driver circuit 7 to drive the LED light board to light up. At the same time, the buck chip U1 of the DC-DC buck circuit 28 steps down the DC power and outputs it to the central control circuit 5, so that the control chip U2 of the central control circuit 5 is powered on and works. After adjusting the adjustable resistor R3 of the high-voltage dimmer 2 for dimming, the AC voltage of the input transformer 1 changes, causing the output voltage of the rectifier circuit 3 to change. At this time, the components such as resistors R19 and R20 in the voltage divider detection circuit 4 calculate the output voltage of the rectifier circuit 3 and send it to the control chip U2 of the central control circuit 5. The control chip U2 outputs a dimming signal to the boost chip U3 of the current boost circuit 6 according to the voltage change. The boost chip U3 controls the MOS transistor M1 to work according to the dimming signal, thereby adjusting the current and voltage output from the constant current boost circuit 6 to the LED driver circuit 7, and realizing the brightness adjustment of the LED light board.

[0026] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A high-input, low-output dimming control system for a series-connected high-voltage dimmer, characterized in that: The system includes a transformer (1) connected to AC power for transforming AC power, a high-voltage dimmer (2) connected to the live wire input of the transformer (1) for phase-cut dimming, a rectifier circuit (3) for converting AC power to DC power, a voltage divider detection circuit (4) for detecting the dimming voltage of the high-voltage dimmer (2), a central control circuit (5) for receiving the detection voltage signal from the voltage divider detection circuit (4) and outputting a dimming signal according to the detected voltage signal, a constant current boost circuit (6) for adjusting the output power current according to the dimming signal, and an LED driver circuit (7) for driving the LED light board to work according to the power current output by the constant current boost circuit (6). The rectifier circuit (3) is connected to a step-down circuit (8) for stepping down DC power and supplying power to the central control circuit (5). The rectifier circuit (3) is connected to the constant current boost circuit (6) for power supply, and the constant current boost circuit (6) is connected to the step-down circuit (8) for low-voltage compensation of the step-down circuit (8).

2. The high-input, low-output dimming control system for a series-connected high-voltage dimmer according to claim 1, characterized in that: The high-voltage dimmer (2) includes a bidirectional thyristor TRIAC1. The T2 terminal of the bidirectional thyristor TRIAC1 is connected to one end of capacitor C4, one end of adjustable resistor R3, and the live wire. The other end of capacitor C4 is connected to the T1 terminal of the bidirectional thyristor TRIAC1, the live wire input terminal of transformer (1), and one end of capacitor C3. The other end of capacitor C3 is connected to one end of resistor R4 and one end of trigger diode DB3. The other end of resistor R4 is connected to the other end of adjustable resistor R3. The other end of trigger diode DB3 is connected to the control terminal of bidirectional thyristor TRIAC1.

3. A high-input, low-output dimming control system for a series-connected high-voltage dimmer according to claim 2, characterized in that: A fuse (FUSE) is connected between the T2 terminal of the bidirectional thyristor TRIAC1 and the live wire.

4. A high-input, low-output dimming control system for a series-connected high-voltage dimmer according to claim 1, characterized in that: The voltage divider detection circuit (4) includes a Zener diode ZD1. The negative terminal of the Zener diode ZD1 is connected to the central control circuit (5), one end of the capacitor C27, one end of the resistor R19, and one end of the resistor R20 through the resistor R22. The positive terminal of the Zener diode ZD1, the other end of the capacitor C27, and the other end of the resistor R20 are grounded respectively. The other end of the resistor R19 is connected to the rectifier circuit (3).

5. A high-input, low-output dimming control system for a series-connected high-voltage dimmer according to claim 1, characterized in that: The central control circuit (5) includes a control chip U2. Pin 1 of the control chip U2 is connected to one end of capacitor C21 and the step-down circuit (8), and the other end of capacitor C21 is grounded. Pin 4 of the control chip U2 is connected to the voltage divider detection circuit (4), pin 5 of the control chip U2 is connected to the constant current boost circuit (6), and pin 8 of the control chip U2 is grounded.

6. A high-input, low-output dimming control system for a series-connected high-voltage dimmer according to claim 1, characterized in that: The constant current boost circuit (6) includes a boost chip U3. Pin 1 of the boost chip U3 is grounded through capacitor C4. Pin 2 of the boost chip U3 is grounded through resistor ROSC. Pin 3 of the boost chip U3 is connected to one end of resistor R4, one end of capacitor C26, and one end of resistor R1. The other ends of resistor R4 and capacitor C26 are grounded. The other end of resistor R1 is connected to the central control circuit (5). Pin 4 of the boost chip U3 is connected to one end of resistor R3 and one end of capacitor C3. The other ends of resistor R3 and capacitor C3 are grounded. Pin 5 of the boost chip U3 is... Do not connect one end of capacitor C6 or one end of resistor R8. The other end of capacitor C6 is grounded. The other end of resistor R8 is grounded through capacitor C5. Pin 11 of boost chip U3 is grounded. Pin 6 of boost chip U3 is connected to one end of resistor R12 and one end of resistor R11. The other end of resistor R12 is grounded. The other end of resistor R11 is connected to the LED driver circuit, the positive terminal of diode D5, one end of capacitor C31, and the negative terminal of diode D1. The negative terminal of diode D5 is connected to the buck circuit (8) and one end of resistor R10. The other end of resistor R10 is connected to capacitor C31. One end of capacitor C9 is connected to pin 9 of the boost chip U3. The other end of capacitor C9 is grounded. The other end of capacitor C31 is connected to one end of resistor R32 and the other end of resistor R31. The other end of resistor R32 is connected to the other end of resistor R31, the positive terminal of diode D1, one end of inductor L1, the drain terminal of MOSFET M1, and one end of capacitor C7. The other end of inductor L1 is connected to one end of capacitor C2, the positive terminal of electrolytic capacitor C1, and the rectifier circuit (3). The other end of capacitor C2 and the negative terminal of electrolytic capacitor EC1 are grounded. The source terminal of MOSFET M1 is connected to the other end of capacitor C7 and the other end of capacitor C7. One end of resistor R16, one end of resistor R18, one end of resistor RC1, one end of resistor RC2, and one end of resistor RC3 are connected. The other ends of resistor RC1, RC2, and RC3 are grounded respectively. The other end of resistor R18 is connected to pin 8 of boost chip U3 and one end of capacitor C14 respectively. The other end of capacitor C14 is grounded. The other end of resistor R16 is connected to the gate of MOSFET M1 and one end of resistor R17 respectively. The other end of resistor R17 is connected to pin 10 of boost chip U3. Pin 7 of boost chip U3 is connected to LED driver circuit (7).

7. A high-input, low-output dimming control system for a series-connected high-voltage dimmer according to claim 1, characterized in that: The step-down circuit (8) includes a step-down chip U1. Pin 3 of the step-down chip U1 is connected to one end of capacitor C23, the positive terminal of electrolytic capacitor E1, one end of resistor R26, one end of resistor R2, and the negative terminal of diode D6. The positive terminal of diode D6 is connected to rectifier circuit (3). The other end of resistor R26 is connected to the other end of resistor R2, the negative terminal of Zener diode ZD2, and constant current boost circuit (6). The positive terminal of Zener diode ZD2 is grounded. The negative terminal of electrolytic capacitor E1, the other end of capacitor C23, and pin 2 of step-down chip U1 are grounded. Pin 1 of step-down chip U1 is connected to the positive terminal of electrolytic capacitor EC2, one end of capacitor C24, and central control circuit (5). The negative terminal of electrolytic capacitor E2 and the other end of capacitor C24 are grounded.

8. A high-input, low-output dimming control system for a series-connected high-voltage dimmer according to claim 1, characterized in that: The LED driver circuit (7) includes a Zener diode ZD3, the negative terminal of which is connected to the constant current boost circuit (6), one end of resistor R30, the positive terminal of electrolytic capacitor EC6, the positive terminal of electrolytic capacitor EC7, one end of capacitor C8, one end of resistor R14, the positive terminal of electrolytic capacitor C13, one end of resistor R16, and the LED+ terminal of the LED board. The positive terminal of Zener diode ZD3, the other end of resistor R30, the negative terminal of electrolytic capacitor EC6, the negative terminal of electrolytic capacitor EC7, and the other end of capacitor C8 are grounded. The other end of resistor R14 is connected to one end of resistor R15 and one end of capacitor C12. The resistor R15 is connected to the following terminals: one end of resistor RB1, one end of resistor RB2, one end of resistor RB3, one end of resistor RB4, the positive terminal of diode D4, one end of resistor R5, one end of resistor R6, and one end of resistor R7. The other end of resistor R15 is connected to the constant current boost circuit (6). The other ends of capacitor C12, resistor RB1, resistor RB2, resistor RB3, and resistor RB4, and the negative terminal of diode D4 are grounded respectively. The other end of resistor R5 is connected to the negative terminal of electrolytic capacitor C13, the other end of resistor R16, the other end of resistor R6, the other end of resistor R7, and the negative terminal of LED light board LED-.

9. A high-input, low-output dimming control system for a series-connected high-voltage dimmer according to claim 1, characterized in that: The rectifier circuit (3) includes a rectifier BD1. Pin 1 of the rectifier BD1 is connected to one end of capacitor C11, one end of capacitor CX12, one end of capacitor X2, and pin 1 of inductor LF1. Pin 2 of the rectifier BD1 is connected to the other end of capacitor C11, the other end of capacitor CX12, the other end of capacitor X2, and pin 2 of inductor LF1. Pin 3 of inductor LF1 is connected to one end of capacitor C10, one end of capacitor CX1, one end of capacitor X1, and transformer (1). Pin 4 of inductor LF1 is connected to the other end of capacitor C10, the other end of capacitor CX1, the other end of capacitor X1, and transformer (1). Pin 3 of rectifier BD1 is grounded. Pin 4 of rectifier BD1 is connected to the positive terminals of diode D3 and diode D2 respectively. The negative terminal of diode D2 is connected to the positive terminal of electrolytic capacitor EC1, one end of resistor R21, and voltage divider detection circuit (4) respectively. The negative terminal of electrolytic capacitor EC1 and the other end of resistor R21 are grounded respectively. The other end of diode D3 is connected to one end of resistor R13, the positive terminal of electrolytic capacitor EC2, one end of capacitor C25, constant current boost circuit (6), and buck circuit (8) respectively. The other end of resistor R13, the negative terminal of electrolytic capacitor EC2, and the other end of capacitor C25 are grounded respectively.

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