LED lamp control circuit capable of suppressing electromagnetic interference of fan

Abstract

The utility model discloses an LED lamp control circuit capable of suppressing electromagnetic interference of a fan, which comprises a fan host controller for supplying power to a lamp panel and transmitting light adjusting signals through two output lines; a rectifying circuit is arranged on the lamp panel, is connected with two output lines of the fan host controller and is used for rectifying an input power supply; the LED driving circuit is used for driving the LED lamp group to emit light and work; the zero-cross detection circuit is connected with the output end of the rectifying circuit and is used for detecting a light adjusting signal in the input power supply; the MCU main control circuit is respectively connected with the LED driving circuit and the zero cross detection circuit, and controls the LED driving circuit to work according to the light adjusting signal; and the electromagnetic interference suppression circuit is connected with the output end of the rectifying circuit and is used for suppressing electromagnetic interference signals input to the rectifying circuit and the zero-cross detection circuit by the fan host controller, so that the lamp panel circuit serving as a capacitive load and the electromagnetic interference suppression circuit serving as a resistive load are connected and complemented, and the electromagnetic interference is suppressed.

Description

[Technical Field]

[0001] This utility model relates to an LED lamp control circuit that suppresses electromagnetic interference from a fan. [Background Technology]

[0002] Existing fan lights with two-wire transmission control functionality typically isolate the fan motor and the LED light board chassis by connecting an insulating sheet with heat dissipation function. However, when the fan starts running, the high-intensity electromagnetic interference generated by the fan rotation affects the fan host's ability to transmit dimming signals to the LED light board for decoding via the two wires. This results in the inability to properly control the LED light board to dim and adjust color temperature, as well as issues such as LED light flickering. [Utility Model Content]

[0003] This invention overcomes the shortcomings of the prior art and provides an LED lamp control circuit that suppresses electromagnetic interference from fans.

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

[0005] An LED lamp control circuit for suppressing electromagnetic interference from a fan is characterized by including a fan controller that supplies power to the lamp panel and transmits lighting adjustment signals through two output lines.

[0006] The lamp panel is equipped with

[0007] The rectifier circuit, connected to the two output lines of the fan host controller, is used to rectify the input power.

[0008] The LED driver circuit is connected to the output of the rectifier circuit and the LED lamp group respectively, and is used to drive the LED lamp group to emit light.

[0009] The zero-crossing detection circuit is connected to the output of the rectifier circuit and is used to detect the lighting adjustment signal in the input power supply.

[0010] The MCU main control circuit is connected to the LED driver circuit and the zero-crossing detection circuit respectively, and controls the LED driver circuit to work according to the light adjustment signal.

[0011] The power supply circuit is connected to the output of the rectifier circuit, the MCU main control circuit and the zero-crossing detection circuit. It is used to step down the rectified power supply and supply power to the MCU main control circuit and the zero-crossing detection circuit.

[0012] The electromagnetic interference suppression circuit is connected to the output of the rectifier circuit and is used to suppress electromagnetic interference signals input from the fan controller to the rectifier circuit and the zero-crossing detection circuit.

[0013] The LED lamp control circuit with the function of suppressing electromagnetic interference of the fan, as described above, is characterized in that: the LED driving circuit includes a cold light LED driving circuit and a warm light LED driving circuit, the LED lamp group includes a cold light LED lamp group and a warm light LED lamp group, the cold light LED driving circuit is connected to the rectifier circuit, the MCU main control circuit and the cold light LED lamp group respectively, and the warm light LED driving circuit is connected to the rectifier circuit, the MCU main control circuit and the warm light LED lamp group respectively.

[0014] The LED lamp control circuit for suppressing electromagnetic interference from a fan, as described above, is characterized in that: the electromagnetic interference suppression circuit includes a constant current driver chip U6, pins 0 and 1 of the constant current driver chip U6 are grounded respectively, pin 2 of the constant current driver chip U6 is grounded through resistor R6, pin 7 of the constant current driver chip U6 is connected to pin 8 of the constant current driver chip U6, thermistor RV3, and one end of resistor R3 respectively, the other end of resistor R3 is connected to resistor R2 and resistor R1 in sequence, and then connected to one end of resistor R5, one end of thermistor RV2, and the output terminal of the rectifier circuit respectively, the other end of resistor R5 and the other end of thermistor RV2 are grounded respectively.

[0015] The LED lamp control circuit for suppressing electromagnetic interference from a fan, as described above, is characterized in that: the zero-crossing detection circuit includes a diode D1, the positive terminal of which is connected to the output terminal of the rectifier circuit; the negative terminal of which is connected in sequence to resistors R13 and R14, and then to one end of resistor R16, one end of capacitor C11, one end of resistor R17, and the negative terminal of Zener diode ZD4; the other end of resistor R16 is connected to one end of capacitor C13, one end of resistor R15, and the base of transistor Q3; the positive terminal of Zener diode ZD4, the other end of resistor R17, the other end of capacitor C11, the other end of capacitor C13, the other end of resistor R15, and the emitter of transistor Q3 are grounded; the collector of transistor Q3 is connected to the MCU main control circuit and one end of resistor R18; and the other end of resistor R18 is connected to the rectifier circuit.

[0016] The LED lamp control circuit for suppressing electromagnetic interference from a fan, as described above, is characterized in that: the MCU main control circuit includes a main control chip U1, pin 4 of the main control chip U1 is connected to one end of resistor R19 and one end of capacitor C6 respectively, the other end of resistor R19 is connected to a rectifier circuit, the other end of capacitor C6 is grounded, pin 7 of the main control chip U1 is grounded, pin 9 of the main control chip U1 is connected to one end of capacitor C8, one end of resistor R20, one end of capacitor C7, one end of capacitor C6 and a rectifier circuit respectively, the other ends of capacitor C8, resistor R20, capacitor C7 and capacitor C6 are grounded respectively, and pins 14-15 of the main control chip U1 are connected to an LED driver circuit respectively.

[0017] The LED lamp control circuit for suppressing electromagnetic interference from a fan, as described above, is characterized in that: the power supply circuit includes a power chip U2, pin 1 of the power chip U2 is connected to the negative terminals of diode D2 and D3 and the positive terminal of electrolytic capacitor C5 respectively, the positive terminal of diode D2 is connected to the rectifier circuit, the negative terminal of electrolytic capacitor C5 is grounded, pin 3 of the power chip U2 is connected to one end of resistor R18 and one end of resistor R19 respectively, the other end of resistor R19 is grounded, pin 2 of the power chip U2 is connected to the positive terminal of diode D3 and the other end of resistor R18 respectively, and pin 2 of the power chip U2 outputs 5V power to supply power to the MCU main control circuit and the zero-crossing detection circuit respectively.

[0018] The LED lamp control circuit for suppressing electromagnetic interference from a fan, as described above, is characterized in that: the rectifier circuit includes a rectifier DB1, pin 1 of rectifier DB1 is connected to one end of the thermistor RV1 and one end of resistor RZ1 respectively, the other end of resistor RZ1 is connected to one of the output lines of the fan host controller, pin 2 of rectifier DB1 is connected to the other end of the thermistor RV1 and one end of resistor RZ2 respectively, the other end of resistor RZ2 is connected to one end of fuse F1, the other end of fuse F1 is connected to another output line of the fan host controller, pin 3 of rectifier DB1 is grounded, and pin 4 of rectifier DB1 serves as an output terminal connected to the LED driver circuit, the zero-crossing detection circuit, the power supply circuit, and the electromagnetic interference suppression circuit respectively.

[0019] The LED lamp control circuit for suppressing fan electromagnetic interference, as described above, is characterized in that: the cold light LED driving circuit includes a driver U5 and a driver U4. Pin 1 of driver U5 is connected to one end of resistor R6, pin 1 of driver U4, one end of capacitor C18, and the negative terminal of Zener diode ZD3. The other end of resistor R6 is connected through resistor R5 to the negative terminal of diode D5, one end of resistor R7, the positive terminal of electrolytic capacitor C2, one end of resistor R11, and the cold light LED lamp group. The positive terminal of diode D5 is connected to the rectifier circuit. The positive terminal of Zener diode ZD3 and the other end of capacitor C18 are grounded. Pins 3 and 5 of driver U5 are grounded. Pin 4 of driver U5 is connected to pin 4 of driver U4, one end of resistor R1, one end of capacitor C17, and the MCU main control circuit. The other ends of resistor R1 and capacitor C17 are grounded. Pin 6 of driver U5 is connected through resistor R1... 3. Grounding: Pin 7 of driver U5 is connected to one end of resistor R8, one end of capacitor C15, one end of resistor R10, and pin 7 of driver U4. The other end of resistor R8 is connected to the other end of resistor R7. The other ends of capacitor C15 and resistor R10 are grounded. Pin 8 of driver U5 is connected to pin 8 of driver U4, the negative terminal of electrolytic capacitor C2, the other end of resistor R11, one end of heating resistor RV5, the positive terminal of Zener diode ZD5, one end of capacitor C19, pin 3 of flicker de-ener Q1, and pin 3 of flicker de-ener Q2. Pins 3 and 5 of driver U4 are grounded. Pin 6 of driver U4 is grounded through resistor R9. The other end of heating resistor RV5 is grounded. The negative terminal of Zener diode ZD5 is connected to the cold light LED group, pin 2 of flicker de-ener Q1, and pin 2 of flicker de-ener Q2. The other end of capacitor C19 is connected to pin 1 of flicker de-ener Q1 and pin 1 of flicker de-ener Q2.

[0020] The LED lamp control circuit for suppressing fan electromagnetic interference, as described above, is characterized in that: the warm light LED driving circuit includes a driver U6 and a driver U7. Pin 1 of driver U6 is connected to one end of resistor R22, pin 1 of driver U7, one end of capacitor C12, and the negative terminal of Zener diode ZD2. The other end of resistor R22 is connected via resistor 21 to the negative terminal of diode D6, one end of resistor R23, the positive terminal of electrolytic capacitor C3, one end of resistor R12, and the warm light LED group. The positive terminal of diode D6 is connected to the rectifier circuit. The positive terminal of Zener diode ZD2 and the other end of capacitor C12 are grounded. Pins 3 and 5 of driver U6 are grounded. Pin 4 of driver U6 is connected to pin 4 of driver U7, one end of resistor R2, one end of capacitor C9, and the MCU main control circuit. The other ends of resistor R2 and capacitor C9 are grounded. Pin 6 of driver U6 is connected via resistor R27. The driver U6 pin 7 is grounded. It is connected to one end of resistor R24, one end of capacitor C10, one end of resistor R26, and the driver U7 pin 7. The other end of resistor R24 ​​is connected to the other end of resistor R23. The other ends of capacitor C10 and resistor R26 are grounded. The driver U6 pin 8 is connected to the driver U7 pin 8, the negative terminal of electrolytic capacitor C3, the other end of resistor R12, one end of heating resistor RV6, the positive terminal of Zener diode ZD6, one end of capacitor C20, the flicker remover Q5 pin 3, and the flicker remover Q6 pin 3. The driver U7 pins 3 and 5 are grounded. The driver U7 pin 6 is grounded through resistor R25. The other end of heating resistor RV6 is grounded. The negative terminal of Zener diode ZD6 is connected to the warm light LED group, the flicker remover Q5 pin 2, and the flicker remover Q6 pin 2. The other end of capacitor C20 is connected to the flicker remover Q5 pin 1 and the flicker remover Q6 pin 1.

[0021] The beneficial effects of this utility model are:

[0022] This invention connects an electromagnetic interference suppression circuit to the output of the rectifier circuit, making the lamp panel circuit, which acts as a capacitive load, and the electromagnetic interference suppression circuit, which acts as a resistive load, complementary. This suppresses the effect of electromagnetic interference, enabling the zero-crossing detection circuit to accurately detect and decode the zero-crossing signal in the input power supply. The MCU main control circuit then accurately controls the LED light color adjustment and dimming based on the detected zero-crossing signal, solving the problem of LED light panels being affected by electromagnetic interference in color changing, brightness adjustment, and light flickering. [Image Description]

[0023] Figure 1 This is a schematic diagram of the present invention;

[0024] Figure 2 This is a circuit diagram of the present invention. [Detailed Implementation]

[0025] The technical solutions in the embodiments of this utility model will now be clearly and completely described in conjunction with the accompanying drawings.

[0026] 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.

[0027] like Figure 1-2 As shown, an LED lamp control circuit for suppressing electromagnetic interference from a fan includes a fan controller 1, which supplies power to the lamp panel and transmits lighting adjustment signals through two output lines; a rectifier circuit 2 on the lamp panel, connected to the two output lines of the fan controller 1, for rectifying the input power; an LED driver circuit, connected to the output of the rectifier circuit 2 and the LED lamp group respectively, for driving the LED lamp group to emit light; a zero-crossing detection circuit 3, connected to the output of the rectifier circuit 2, for detecting the lighting adjustment signal in the input power; an MCU main control circuit 4, connected to the LED driver circuit and the zero-crossing detection circuit 3 respectively, for controlling the operation of the LED driver circuit according to the lighting adjustment signal; a power supply circuit 5, connected to the output of the rectifier circuit 2, the MCU main control circuit 4, and the zero-crossing detection circuit 3, for stepping down the rectified power supply and supplying power to the MCU main control circuit 4 and the zero-crossing detection circuit 3; and an electromagnetic interference suppression circuit 6, connected to the output of the rectifier circuit 2, for suppressing the electromagnetic interference signals input from the fan controller 1 to the rectifier circuit 2 and the zero-crossing detection circuit 3.

[0028] When the fan is operating and color or brightness adjustment is required, a lighting adjustment signal is sent to the fan controller 1 via the remote control. The fan controller 1 then supplies power to the light panel and transmits the lighting adjustment signal through two output lines. At the same time, the electromagnetic interference signal generated by the fan operation is also sent to the light panel through the two output lines. Subsequently, the rectifier circuit 2 on the light panel rectifies the power input from the two output lines of the fan controller 1 and outputs it. Simultaneously, the electromagnetic interference suppression circuit 6 suppresses the electromagnetic interference signal at the output of the rectifier circuit 2. At this point, the zero-crossing detection circuit 3 accurately detects the lighting adjustment signal after the suppressed electromagnetic interference signal is output from the rectifier circuit 2 and sends it to the MCU main control circuit 4. The MCU main control circuit 4 controls the LED driver circuit to drive the corresponding LED group to perform color and brightness adjustments based on the detected lighting adjustment signal. Specifically, the DC power output from the rectifier circuit 2 directly powers the LED driver circuit; the power supply circuit 5 steps down the DC power output from the rectifier circuit 2 and then supplies power to both the MCU main control circuit 4 and the zero-crossing detection circuit 3.

[0029] In this case, the lamp panel circuit is a capacitive load, and the electromagnetic interference suppression circuit is a resistive load. By making the capacitive and resistive loads complementary, the electromagnetic interference suppression effect is achieved. This enables the zero-crossing detection circuit to accurately detect and decode the zero-crossing signal in the input power supply, and allows the MCU main control circuit to accurately control the LED lights to illuminate based on the detected zero-crossing signal. This solves the problem of LED light panels being affected by electromagnetic interference in color changing, brightness adjustment, and light flickering.

[0030] like Figure 1 As shown, the LED driving circuit includes a cold light LED driving circuit 71 and a warm light LED driving circuit 72, and the LED lamp group includes a cold light LED lamp group 81 and a warm light LED lamp group 82. The cold light LED driving circuit 71 is connected to the rectifier circuit 2, the MCU main control circuit 4, and the cold light LED lamp group 81, respectively. The warm light LED driving circuit 72 is connected to the rectifier circuit 2, the MCU main control circuit 4, and the warm light LED lamp group 82, respectively. During color adjustment or dimming, the MCU main control circuit 4 controls the cold light LED driving circuit 71 and the warm light LED driving circuit 72 to work, thereby driving the cold light LED lamp group 81 and the warm light LED lamp group 82 to work, realizing the color adjustment and dimming work.

[0031] like Figure 2 As shown, in this case, the fan host controller 1 outputs DC power, and the rectifier bridge DB1 in the rectifier circuit 2 rectifies the DC power into linear DC power before outputting it.

[0032] like Figure 2 As shown, the constant current drive chip U6 in the electromagnetic interference suppression circuit 6 is connected in series with a resistor and a varistor to form an electromagnetic interference suppression circuit, which can suppress the electromagnetic interference signal at the output of the rectifier circuit 2. The electromagnetic interference suppression effect is achieved by making the capacitive load and the resistive load complementary.

[0033] like Figure 2 As shown, when the light adjustment signal output by the rectifier circuit 2 is detected, the transistor Q3 in the zero-crossing detection circuit 3 turns on to decode the signal and sends the decoded signal to the MCU main control circuit 4. Specifically, the light adjustment signal is the power supply zero-crossing signal.

[0034] like Figure 2 As shown, after receiving the decoding signal from the zero-crossing detection circuit 3, the MCU main control circuit 4 controls the LED driver circuit to perform color adjustment and dimming work according to the decoding signal.

[0035] like Figure 2 As shown, the power supply chip U2 in the power supply circuit 5 steps down the linear DC output from the rectifier circuit 2 to 5V DC and then supplies power to the MCU main control circuit 4 and the zero-crossing detection circuit 3.

[0036] like Figure 2 As shown, the cool-light LED lamp group 81 is composed of multiple cool-colored LEDs connected in parallel; the warm-light LED lamp group 82 is composed of multiple warm-colored LEDs connected in parallel. During color adjustment, the MCU main control circuit 4 controls the operation of the cool-light LED driving circuit 71 and the warm-light LED driving circuit 72 respectively. This causes the drivers U5 and U4 in the cool-light LED driving circuit 71 to operate, driving the cool-colored LEDs in the cool-light LED lamp group 81 to emit light, and causes the drivers U6 and U7 in the warm-light LED driving circuit 72 to operate, driving the multiple warm-colored LEDs in the warm-light LED lamp group 82 to emit light, thus achieving color adjustment.

[0037] 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. An LED lamp control circuit for suppressing electromagnetic interference from a fan, characterized in that: Including The fan host controller (1) supplies power to the lamp panel and transmits lighting adjustment signals through two output lines; The lamp panel is equipped with The rectifier circuit (2) is connected to the two output lines of the fan host controller (1) to rectify the input power supply; The LED driving circuit is connected to the output terminal of the rectifier circuit (2) and the LED lamp group respectively, and is used to drive the LED lamp group to light up. The zero-crossing detection circuit (3) is connected to the output terminal of the rectifier circuit (2) and is used to detect the light adjustment signal in the input power supply; The MCU main control circuit (4) is connected to the LED driving circuit and the zero-crossing detection circuit (3) respectively, and controls the LED driving circuit to work according to the light adjustment signal; The power supply circuit (5) is connected to the output terminal of the rectifier circuit (2), the MCU main control circuit (4) and the zero-crossing detection circuit (3), and is used to step down the rectified power supply and supply power to the MCU main control circuit (4) and the zero-crossing detection circuit (3); The electromagnetic interference suppression circuit (6) is connected to the output terminal of the rectifier circuit (2) and is used to suppress the electromagnetic interference signal input from the fan host controller (1) to the rectifier circuit (2) and the zero-crossing detection circuit (3).

2. The LED lamp control circuit for suppressing fan electromagnetic interference according to claim 1, characterized in that: The LED driving circuit includes a cold light LED driving circuit (71) and a warm light LED driving circuit (72). The LED lamp group includes a cold light LED lamp group (81) and a warm light LED lamp group (82). The cold light LED driving circuit (71) is connected to the rectifier circuit (2), the MCU main control circuit (4) and the cold light LED lamp group (81) respectively. The warm light LED driving circuit (72) is connected to the rectifier circuit (2), the MCU main control circuit (4) and the warm light LED lamp group (82) respectively.

3. The LED lamp control circuit for suppressing fan electromagnetic interference according to claim 1, characterized in that: The electromagnetic interference suppression circuit (6) includes a constant current drive chip U6. Pins 0 and 1 of the constant current drive chip U6 are grounded respectively. Pin 2 of the constant current drive chip U6 is grounded through resistor R6. Pin 7 of the constant current drive chip U6 is connected to pin 8 of the constant current drive chip U6, thermistor RV3, and one end of resistor R3 respectively. The other end of resistor R3 is connected to resistor R2 and resistor R1 in sequence, and then connected to one end of resistor R5, one end of thermistor RV2, and the output terminal of rectifier circuit (2) respectively. The other end of resistor R5 and the other end of thermistor RV2 are grounded respectively.

4. The LED lamp control circuit for suppressing fan electromagnetic interference according to claim 1, characterized in that: The zero-crossing detection circuit (3) includes a diode D1. The positive terminal of the diode D1 is connected to the output terminal of the rectifier circuit (2). The negative terminal of the diode D1 is connected to resistors R13 and R14 in sequence, and then connected to one end of resistor R16, one end of capacitor C11, one end of resistor R17, and the negative terminal of Zener diode ZD4. The other end of resistor R16 is connected to one end of capacitor C13, one end of resistor R15, and the base of transistor Q3. The positive terminal of Zener diode ZD4, the other end of resistor R17, the other end of capacitor C11, the other end of capacitor C13, the other end of resistor R15, and the emitter of transistor Q3 are grounded. The collector of transistor Q3 is connected to the MCU main control circuit (4) and one end of resistor R18. The other end of resistor R18 is connected to the rectifier circuit (2).

5. The LED lamp control circuit for suppressing fan electromagnetic interference according to claim 1, characterized in that: The MCU main control circuit (4) includes a main control chip U1. Pin 4 of the main control chip U1 is connected to one end of resistor R19 and one end of capacitor C6 respectively. The other end of resistor R19 is connected to rectifier circuit (2). The other end of capacitor C6 is grounded. Pin 7 of the main control chip U1 is grounded. Pin 9 of the main control chip U1 is connected to one end of capacitor C8, one end of resistor R20, one end of capacitor C7, one end of capacitor C6 and rectifier circuit (2) respectively. The other ends of capacitor C8, resistor R20, capacitor C7 and capacitor C6 are grounded respectively. Pins 14-15 of the main control chip U1 are connected to LED driving circuit respectively.

6. The LED lamp control circuit for suppressing fan electromagnetic interference according to claim 1, characterized in that: The power supply circuit (5) includes a power chip U2. Pin 1 of the power chip U2 is connected to the negative terminal of diode D2, the negative terminal of diode D3, and the positive terminal of electrolytic capacitor C5. The positive terminal of diode D2 is connected to the rectifier circuit (2). The negative terminal of electrolytic capacitor C5 is grounded. Pin 3 of the power chip U2 is connected to one end of resistor R18 and one end of resistor R19. The other end of resistor R19 is grounded. Pin 2 of the power chip U2 is connected to the positive terminal of diode D3 and the other end of resistor R18. Pin 2 of the power chip U2 outputs 5V power to supply power to the MCU main control circuit (4) and the zero-crossing detection circuit (3).

7. The LED lamp control circuit for suppressing fan electromagnetic interference according to claim 1, characterized in that: The rectifier circuit (2) includes a rectifier DB1. Pin 1 of the rectifier DB1 is connected to one end of the thermistor RV1 and one end of the resistor RZ1. The other end of the resistor RZ1 is connected to one of the output lines of the fan host controller (1). Pin 2 of the rectifier DB1 is connected to the other end of the thermistor RV1 and one end of the resistor RZ2. The other end of the resistor RZ2 is connected to one end of the fuse F1. The other end of the fuse F1 is connected to another output line of the fan host controller (1). Pin 3 of the rectifier DB1 is grounded. Pin 4 of the rectifier DB1 is connected as an output terminal to the LED driving circuit, the zero-crossing detection circuit (3), the power supply circuit (5), and the electromagnetic interference suppression circuit (6).

8. The LED lamp control circuit for suppressing fan electromagnetic interference according to claim 2, characterized in that: The cold light LED driving circuit (71) includes driver U5 and driver U4. Driver U5 pin 1 is connected to one end of resistor R6, driver U4 pin 1, one end of capacitor C18, and the negative terminal of Zener diode ZD3. The other end of resistor R6 is connected to the negative terminal of diode D5, one end of resistor R7, the positive terminal of electrolytic capacitor C2, one end of resistor R11, and the cold light LED lamp group (81) through resistor R5. The positive terminal of diode D5 is connected to rectifier circuit (2). The positive terminal of Zener diode ZD3 and the other end of capacitor C18 are grounded. Driver U5 pins 3 and 5 are grounded. Driver U5 pin 4 is connected to driver U4 pin 4, one end of resistor R1, one end of capacitor C17, and MCU main control circuit (4). The other end of resistor R1 and the other end of capacitor C17 are grounded. Driver U5 pin 6 is grounded through resistor R13. 7 is connected to one end of resistor R8, one end of capacitor C15, one end of resistor R10, and pin 7 of driver U4 respectively. The other end of resistor R8 is connected to the other end of resistor R7. The other end of capacitor C15 and the other end of resistor R10 are grounded respectively. Pin 8 of driver U5 is connected to pin 8 of driver U4, the negative terminal of electrolytic capacitor C2, the other end of resistor R11, one end of heating resistor RV5, the positive terminal of Zener diode ZD5, one end of capacitor C19, pin 3 of flicker remover Q1, and pin 3 of flicker remover Q2 respectively. Pins 3 and 5 of driver U4 are grounded respectively. Pin 6 of driver U4 is grounded through resistor R9. The other end of heating resistor RV5 is grounded. The negative terminal of Zener diode ZD5 is connected to the cold light LED lamp group (81), pin 2 of flicker remover Q1, and pin 2 of flicker remover Q2 respectively. The other end of capacitor C19 is connected to pin 1 of flicker remover Q1 and pin 1 of flicker remover Q2 respectively.

9. The LED lamp control circuit for suppressing fan electromagnetic interference according to claim 2, characterized in that: The warm light LED driving circuit (72) includes driver U6 and driver U7. The pin 1 of driver U6 is connected to one end of resistor R22, the pin 1 of driver U7, one end of capacitor C12, and the negative terminal of Zener diode ZD2. The other end of resistor R22 is connected to the negative terminal of diode D6, one end of resistor R23, the positive terminal of electrolytic capacitor C3, one end of resistor R12, and the warm light LED lamp group (82) through resistor 21. The positive terminal of diode D6 is connected to rectifier circuit (2). The positive terminal of Zener diode ZD2 and the other end of capacitor C12 are grounded. The pins 3 and 5 of driver U6 are grounded. The pin 4 of driver U6 is connected to the pin 4 of driver U7, one end of resistor R2, one end of capacitor C9, and MCU main control circuit (4). The other ends of resistor R2 and capacitor C9 are grounded. The pin 6 of driver U6 is grounded through resistor R27. The pin 7 of driver U6 is connected to... Connect one end of resistor R24, one end of capacitor C10, one end of resistor R26, and pin 7 of driver U7. Connect the other end of resistor R24 ​​to the other end of resistor R23. Connect the other end of capacitor C10 and the other end of resistor R26 to ground. Connect pin 8 of driver U6 to pin 8 of driver U7, the negative terminal of electrolytic capacitor C3, the other end of resistor R12, one end of heating resistor RV6, the positive terminal of Zener diode ZD6, one end of capacitor C20, pin 3 of flicker remover Q5, and pin 3 of flicker remover Q6. Connect pin 3 and pin 5 of driver U7 to ground. Connect pin 6 of driver U7 to ground through resistor R25. Connect the other end of heating resistor RV6 to ground. Connect the negative terminal of Zener diode ZD6 to the warm light LED group (82), pin 2 of flicker remover Q5, and pin 2 of flicker remover Q6. Connect the other end of capacitor C20 to pin 1 of flicker remover Q5 and pin 1 of flicker remover Q6.

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