Motor high and low beam switching device

Abstract

The utility model relates to the technical field of vehicle lighting, in particular to a motor high-low beam switching device, which comprises a fixing plate, a driving device and a driving device, the base is fixedly connected with the fixing plate; the motor is mounted on the base; the control panel is installed on the base, and an output line of the control panel is electrically connected with the positive and negative electrodes of the motor and used for controlling the rotating direction and rotating speed of the motor; one end of the rotating shaft is mounted in the outer wall rotating hole of the base, and the other end of the rotating shaft is in transmission connection with a rotating shaft of the motor; the spring sleeves the rotating shaft, and the rotating shaft is used for driving the spring to slide; the light blocking sliding block is installed on the rotating shaft, and the spring is used for driving the light blocking sliding block to slide along the rotating shaft to switch high beam and low beam.

Description

Technical Field

[0001] This utility model relates to the field of vehicle lighting technology, specifically to a motor high / low beam switching device. Background Technology

[0002] In vehicle lighting, switching between high and low beams typically requires a switching device. Existing high / low beam switching devices usually consist of an electromagnetic device and a return spring. The moving shaft of the electromagnetic device is connected to a metal plate, i.e., a light-blocking plate, and the return spring is placed between the moving shaft, the metal plate, and the electromagnetic device. When the vehicle lights switch to low beam, the electromagnet is de-energized, and the light-blocking plate returns to its original position under the spring force, switching the lights to low beam. When the vehicle lights switch to high beam, the electromagnet is energized, and the light-blocking plate is pulled closer by the electromagnetic device under the magnetic force, switching the lights to high beam.

[0003] This type of high / low beam switching device requires the electromagnetic device to be continuously powered when switching to high beams. The power of the electromagnetic device is usually six to ten watts, resulting in low overall lamp efficiency and high power consumption. The continuous power supply puts a significant strain on the vehicle's battery, especially affecting the driving range of new energy vehicles. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a motor high / low beam switching device, which aims to solve the problem that the electromagnetic device in existing beam-switching devices requires continuous energy consumption.

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

[0006] This utility model discloses a motor high / low beam switching device, comprising:

[0007] A mounting plate is used for secure connection to the vehicle lights.

[0008] A base, which is fixedly connected to the fixing plate;

[0009] The motor is mounted on the base;

[0010] A control board is mounted on the base, and the output lines of the control board are electrically connected to the positive and negative terminals of the motor to control the rotation direction and speed of the motor.

[0011] A rotating shaft, one end of which is installed in a rotating hole on the outer wall of the base, and the other end of which is connected to the rotating shaft of the motor for transmission.

[0012] A spring is sleeved on the rotating shaft, and the rotating shaft is used to drive the spring to slide.

[0013] A smooth block is installed on the rotating shaft, and a spring is used to drive the smooth block to slide along the rotating shaft to switch between high and low beams.

[0014] Furthermore, the rotating shaft has a cylindrical structure, with a D-shaped hole recessed at one end, which fits into the rotating shaft of the motor; a cylindrical protrusion protrudes from the other end of the rotating shaft, which passes through the smoothing block and fits into the rotating hole on the outer wall of the base; a cylindrical protrusion is provided on the circumference of the middle section of the rotating shaft, which cooperates with the spring to realize the sliding of the spring.

[0015] Furthermore, the light-blocking block includes: a light-blocking plate and a slider. The light-blocking plate is arc-shaped and used to switch between high and low beams. The slider is provided with a sliding plate and two mounting plates. The sliding plate is fixedly connected to the light-blocking plate. The two mounting plates are respectively vertically mounted at both ends of the sliding plate. Both mounting plates are provided with circular fixing holes. The rotating shaft passes through the circular fixing holes, allowing the light-blocking block to slide along the rotating shaft via the mounting plates.

[0016] Furthermore, the spring has a size of 0.2*5*5mm. The spring is placed on the rotating shaft and fixed between the two mounting plates. The spring cooperates with the rotating shaft to slide and push the smooth block to slide.

[0017] Furthermore, the spring is provided with fixing feet at both ends, and the slide plate is provided with rectangular openings for fixing the fixing feet at both ends of the spring.

[0018] Furthermore, one of the mounting plates is provided with a clearance opening in the circular fixing hole, the clearance opening being used to avoid the cylindrical protrusion to achieve the installation of the rotating shaft and the smooth block.

[0019] Furthermore, the base is provided with a motor compartment, a shaft compartment, and a control board compartment. The motor is installed in the motor compartment, the shaft is installed in the shaft compartment, and the control board is installed in the control board compartment.

[0020] Furthermore, the mounting plate is provided with at least one screw hole for connecting to the vehicle light.

[0021] Furthermore, the control board is an FR4 circuit board and includes: a control module, a motor drive module, and a system power supply module. The control module, the motor drive module, and the system power supply module are electrically connected to each other. The system power supply module is used to supply power to the control module and the motor drive module. The control module is used to detect input signals and send control signals to the motor drive module according to the input signals. The motor drive module is used to receive control signals and control the motor to rotate forward or backward according to the control signals.

[0022] Furthermore, the system power supply module includes: a power control chip U1, a diode D1, a capacitor C1, and a capacitor C2. The positive terminal of the diode D1 is connected to the power supply voltage VCC, and the negative terminal of the diode D1 is connected to the second pin of the power control chip U1. One end of the capacitor C1 is connected to the second pin of the power control chip U1, and the other end of the capacitor C1 is grounded. One end of the capacitor C2 is connected to the third pin of the power control chip U1, and the other end of the capacitor C2 is grounded. The third pin of the power control chip U1 outputs the operating voltage VDD, and the first pin of the power control chip U1 is grounded.

[0023] The control module includes: a main control chip U2, resistors R1 and R2, a bidirectional Zener diode DZ1, and a capacitor C3. One end of resistor R1 is connected to the signal detection port, and the other end of resistor R1 is connected to the third pin of the main control chip U2. The negative terminal of the bidirectional Zener diode DZ1 is connected to the third pin of the main control chip U2, and the positive terminal of the bidirectional Zener diode DZ1 is grounded. One end of resistor R2 is connected to the third pin of the main control chip U2, and the other end of resistor R2 is grounded. The second pin of the main control chip U2 is grounded, and the fifth pin of the main control chip U2 is connected to the operating voltage VDD. One end of capacitor C3 is connected to the second pin of the main control chip U2, and the other end of capacitor C3 is connected to the fifth pin of the main control chip U2.

[0024] The motor drive module includes a motor drive chip U3 and a capacitor C4. The first pin of the motor drive chip U3 is connected to the negative terminal of the motor, the sixth pin of the motor drive chip U3 is connected to the positive terminal of the motor, the third pin of the motor drive chip U3 is connected to the sixth pin of the main control chip U2, the fourth pin of the motor drive chip U3 is connected to the fourth pin of the main control chip U2, the second pin of the motor drive chip U3 is grounded, the fifth pin of the motor drive chip U3 is connected to the operating voltage VDD, one end of the capacitor C4 is connected to the second pin of the motor drive chip U3, and the other end of the capacitor C4 is connected to the fifth pin of the motor drive chip U3.

[0025] The advantages of the motor high / low beam switching device described in this utility model are as follows:

[0026] Compared to existing beam-switching devices that require continuous energy consumption from electromagnetic components, this new method uses a mounting plate to fix the motor-driven high / low beam switching device to the headlight position. The control board controls the motor to rotate the shaft in both directions, causing the spring to slide and push the baffle block to slide left and right, thus switching between high and low beams. Specifically, when the baffle block slides to the right or stops on the right, the headlight beam propagation is unaffected, and the headlight is in high beam mode. When the baffle block slides to the left or stops on the left, it blocks the light beam illuminating a farther direction, switching the headlight to low beam mode. Specifically, when the motor rotates forward, the baffle block slides to the right and reaches the right side of the base plate; when the motor rotates in reverse, the baffle block slides to the left and reaches the left side of the base plate. Because the motor requires only a small current (0.2W) during rotation, after rotation, the control board no longer needs to drive the motor to maintain the baffle block's position. The control board enters a low-power mode, with the total power consumption below 0.01W, thus reducing the overall power consumption and effectively lowering the power consumption of the vehicle's headlights, preventing power depletion in the vehicle's power supply system. Attached Figure Description

[0027] Figure 1 This is one of the overall structural schematic diagrams of the motor high / low beam switching device according to an embodiment of this utility model.

[0028] Figure 2 This is the second schematic diagram of the overall structure of the motor high / low beam switching device according to an embodiment of this utility model.

[0029] Figure 3 This is a partial structural schematic diagram of the motor high / low beam switching device according to an embodiment of the present utility model.

[0030] Figure 4 This is a structural disassembly diagram of the motor high / low beam switching device according to an embodiment of the present invention.

[0031] Figure 5 This is a schematic diagram of the overall structure of the smooth block according to an embodiment of the present invention.

[0032] Figure 6 This is a schematic diagram of the overall structure of the rotating shaft according to an embodiment of the present invention.

[0033] Figure 7 This is a schematic diagram of the circuit structure of the control board according to an embodiment of the present invention.

[0034] Figure 8 This is a schematic diagram of the control system flow of the control board according to an embodiment of the present invention.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1. Fixing plate; 11. Screw hole; 2. Base; 21. Outer wall drill hole; 22. Motor compartment; 23. Shaft compartment; 24. Control board compartment; 3. Motor; 4. Control board; 5. Shaft; 51. D-shaped hole; 52. Cylindrical protrusion; 53. Cylindrical protrusion; 6. Spring; 7. Smooth block; 71. Light blocking plate; 72. Slider; 721. Slide plate; 7211. Rectangular opening; 722. Mounting plate; 7221. Circular fixing hole; 7222. Clearance opening. Detailed Implementation

[0037] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0038] like Figures 1 to 4 As shown, an embodiment of this utility model discloses a high / low beam switching device for a motor 3, comprising:

[0039] Mounting plate 1 is used for fixed connection with the vehicle headlight;

[0040] Base 2 is fixedly connected to fixing plate 1;

[0041] Motor 3, motor 3 is mounted on base 2;

[0042] Control board 4 is mounted on base 2. The output wires of control board 4 are electrically connected to the positive and negative terminals of motor 3 to control the rotation direction and speed of motor 3.

[0043] The rotating shaft 5 has one end installed in the rotating hole 21 on the outer wall of the base 2, and the other end of the rotating shaft 5 is connected to the rotating shaft 5 of the motor 3 for transmission.

[0044] Spring 6 is sleeved on pivot 5, and pivot 5 is used to drive spring 6 to slide.

[0045] A smooth block 7 is installed on the rotating shaft 5, and a spring 6 is used to drive the smooth block 7 to slide along the rotating shaft 5 to switch between high and low beams.

[0046] Compared to existing beam-switching devices where the electromagnetic device requires continuous energy consumption, this design uses a mounting plate 1 to fix the motor 3 (high / low beam switching device) to the headlight position. The control plate 4 controls the motor 3 to rotate the shaft 5 in both directions, causing the spring 6 to slide and push the baffle block 7 to slide left and right, thus switching between high and low beams. Specifically: when the baffle block 7 slides to the right or stops on the right, the headlight beam propagation is unaffected, and the headlight is in high beam mode. When the baffle block 7 slides to the left or stops on the left, it blocks the light emitted by the headlight in a more distant direction, switching the headlight to low beam mode. Specifically, when the motor 3 rotates forward, the baffle block 7 slides to the right and reaches the right side of the base 2; when the motor 3 rotates in reverse, the baffle block 7 slides to the left and reaches the left side of the base 2. Since the current required for the motor 3 to rotate is small, with a power of only 0.2W, after the rotation is completed, the control board 4 no longer needs to drive the motor 3 to rotate to maintain the position of the smooth block 7. The control board 4 enters a low power consumption mode, at which time the total power is less than 0.01W, thereby reducing the overall power consumption and effectively reducing the power consumption required for the vehicle's lights, thus avoiding the phenomenon of power loss in the vehicle's power supply device.

[0047] It should be noted that motor 3 is a DC motor with a power supply voltage of 3-3.7V, an operating current of 50mA, and a stall current of 110mA. It is small in size, has low current, and strong load-bearing capacity. The fixing plate 1, base 2, rotating shaft 5, and smooth stop block 7 can be made of either polymer composite material or metal. The fixing plate 1, base 2, and rotating shaft 5 are made of polymer composite material; the smooth stop block 7 is made of metal. Specifically, the polymer composite material is a rigid plastic that can withstand high temperatures. Rigid plastics are injection molded, resulting in low cost, long service life, and easy processing, possessing good commercial value and playing a significant role in reducing costs and extending equipment lifespan for enterprises.

[0048] Furthermore, such as Figure 6 As shown, the rotating shaft 5 has a cylindrical structure. One end of the rotating shaft 5 is recessed and has a D-shaped hole 51, which fits into the rotating shaft 5 of the motor 3. The other end of the rotating shaft 5 is protruding and has a cylindrical protrusion 52, which passes through the smooth block 7 and fits into the rotating hole 21 on the outer wall of the base 2. The rotating shaft 5 has a cylindrical protrusion 53 on the circumference of the middle section, which cooperates with the spring 6 to realize the sliding of the spring 6.

[0049] Furthermore, such as Figure 5As shown, the light-blocking block 7 includes a light-blocking plate 71 and a slider 72. The light-blocking plate 71 is arc-shaped and used to switch between high and low beams. The slider 72 is provided with a sliding plate 721 and two mounting plates 722. The sliding plate 721 is fixedly connected to the light-blocking plate 71. The two mounting plates 722 are respectively vertically mounted at both ends of the sliding plate 721. Both mounting plates 722 are provided with circular fixing holes 7221. The rotating shaft 5 passes through the circular fixing holes 7221, so that the light-blocking block 7 can slide along the rotating shaft 5 through the mounting plates 722.

[0050] When the smooth block 7 slides to the right or stops on the right, the light beam of the headlight is not affected by the light shield 71, and the headlight is in high beam mode. When the smooth block 7 slides to the left or stops on the left, the light shield 71 blocks the light emitted by the headlight that shines in a farther direction, switching the headlight to low beam mode. Specifically, when the motor 3 rotates forward, the smooth block 7 slides to the right and the right mounting plate 722 reaches the right baffle position of the base 2. When the motor 3 rotates in reverse, the smooth block 7 slides to the left and the left mounting plate 722 reaches the left baffle position of the base 2.

[0051] Furthermore, such as Figure 3 As shown, the spring 6 has a size of 0.2*5*5mm. The spring 6 is placed on the rotating shaft 5 and fixed between the two mounting plates 722. The spring 6 and the rotating shaft 5 cooperate to slide and push the smooth block 7 to slide.

[0052] Furthermore, such as Figure 3 As shown, the spring 6 has fixed feet at both ends, and the slide plate 721 has a rectangular opening 7211 for fixing the fixed feet at both ends of the spring 6. By fixing the fixed feet at both ends of the spring 6 to the rectangular opening 7211 of the slide plate 721, when the cylindrical protrusion 53 of the rotating shaft 5 rotates along the spring 6, the spring 6 can slide along the direction of the rectangular opening 7211, and then the elastic force of the spring 6 pushes the mounting plate 722, causing the smooth block 7 to move left and right.

[0053] Furthermore, such as Figure 5 As shown, one of the mounting plates 722 has a clearance opening 7222 in the circular fixing hole 7221. The clearance opening 7222 is used to avoid the cylindrical protrusion 53 to realize the installation of the rotating shaft 5 and the smooth block 7.

[0054] Furthermore, such as Figure 4 As shown, the base 2 is provided with a motor compartment 22, a shaft compartment 23 and a control board compartment 24. The motor 3 is installed in the motor compartment 22, the shaft 5 is installed in the shaft compartment 23 and the control board 4 is installed in the control board compartment 24.

[0055] Furthermore, such as Figure 1As shown, the mounting plate 1 has at least one screw hole 11 for connecting to the vehicle headlight. The high / low beam switching device of the motor 3 is fixed to the vehicle headlight by bolts threaded into the screw hole 11 of the mounting plate 1, thereby realizing the switching of high and low beams.

[0056] Furthermore, such as Figure 7 As shown, the control board 4 is an FR4 circuit board and includes: a control module, a motor 3 drive module, and a system power supply module. The control module, the motor 3 drive module, and the system power supply module are electrically connected to each other. The system power supply module is used to supply power to the control module and the motor 3 drive module. The control module is used to detect input signals and send control signals to the motor 3 drive module according to the input signals. The motor 3 drive module is used to receive control signals and control the motor 3 to rotate forward or backward according to the control signals.

[0057] Furthermore, the system power supply module includes: a power control chip U1, a diode D1, a capacitor C1 and a capacitor C2. The positive terminal of the diode D1 is connected to the power supply voltage VCC, and the negative terminal of the diode D1 is connected to the second pin of the power control chip U1. One end of the capacitor C1 is connected to the second pin of the power control chip U1, and the other end of the capacitor C1 is grounded. One end of the capacitor C2 is connected to the third pin of the power control chip U1, and the other end of the capacitor C2 is grounded. The third pin of the power control chip U1 outputs the operating voltage VDD, and the first pin of the power control chip U1 is grounded.

[0058] The control module includes: a main control chip U2, resistors R1 and R2, a bidirectional Zener diode DZ1, and a capacitor C3. One end of resistor R1 is connected to the signal detection port, and the other end of resistor R1 is connected to the third pin of the main control chip U2. The cathode of the bidirectional Zener diode DZ1 is connected to the third pin of the main control chip U2, and the anode of the bidirectional Zener diode DZ1 is grounded. One end of resistor R2 is connected to the third pin of the main control chip U2, and the other end of resistor R2 is grounded. The second pin of the main control chip U2 is grounded, and the fifth pin of the main control chip U2 is connected to the operating voltage VDD. One end of capacitor C3 is connected to the second pin of the main control chip U2, and the other end of capacitor C3 is connected to the fifth pin of the main control chip U2.

[0059] The motor 3 drive module includes: a motor 3 drive chip U3 and a capacitor C4. The first pin of the motor 3 drive chip U3 is connected to the negative terminal of the motor 3, the sixth pin of the motor 3 drive chip U3 is connected to the positive terminal of the motor 3, the third pin of the motor 3 drive chip U3 is connected to the sixth pin of the main control chip U2, the fourth pin of the motor 3 drive chip U3 is connected to the fourth pin of the main control chip U2, the second pin of the motor 3 drive chip U3 is grounded, the fifth pin of the motor 3 drive chip U3 is connected to the operating voltage VDD, one end of the capacitor C4 is connected to the second pin of the motor 3 drive chip U3, and the other end of the capacitor C4 is connected to the fifth pin of the motor 3 drive chip U3.

[0060] The system circuit is integrated on the control board 4. The system is powered by the system power supply module. The power control chip U1 can be an LDO chip or a DC-DC chip. The capacitance of the capacitors and resistors is not limited. A diode D1 is provided in front of the input terminal of the power control chip U1 to prevent reverse connection and protect the subsequent circuits.

[0061] The main control chip U2 in the control module on control board 4 is the main control chip; refer to the control logic. Figure 8 When the main control chip U2 detects a high level, it outputs a forward rotation signal to the motor 3 drive chip U3; when the main control chip U2 detects a low level, it outputs a reverse rotation signal to the motor 3 drive chip U3, and maintains a low output level at the end. The output time for the forward or reverse rotation signal is 50ms, and the signal is an 800Hz waveform with a 60% duty cycle. The rotation time or waveform percentage is not limited.

[0062] The motor 3 drive module on the control board 4 drives the motor 3 to rotate according to the control signal issued by the main control chip U2, thereby causing the smooth block 7 to slide.

[0063] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the technical scope of the present utility model. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A motor high / low beam switching device, characterized in that, Include: Fixed plate for fixed connection with car light; Base, the base is fixedly connected with the fixed plate; Motor, the motor is installed on the base; Control panel, the control panel is installed on the base, the output line of the control panel is connected with the positive and negative electrode of the motor, which is used for controlling the rotating direction and rotating speed of the motor; Shaft, one end of the shaft is installed in the outer wall rotating hole of the base, the other end of the shaft is drivingly connected with the rotating shaft of the motor; Spring, the spring is sleeved on the rotating shaft, the rotating shaft is used to drive the spring to slide; Light blocking slider, the light blocking slider is installed on the rotating shaft, the spring is used to drive the light blocking slider to slide along the rotating shaft to switch high and low beam.

2. The motor high beam / low beam switching device according to claim 1, characterized by The rotating shaft is a cylindrical structure, one end of the rotating shaft is concave and provided with a D-shaped hole, the D-shaped hole is embedded with the rotating shaft of the motor; the other end of the rotating shaft is convex and provided with a cylindrical convex part, the cylindrical convex part passes through the light blocking slider and is embedded with the outer wall rotating hole of the base; the rotating shaft is provided with a cylindrical convex block on the middle segment, the cylindrical convex block cooperates with the spring to realize the sliding of the spring.

3. The motor high beam / low beam switching device according to claim 2, characterized by The light blocking slider includes: a light blocking plate and a slider, the light blocking plate is arc-shaped, which is used to switch high and low beam; the slider is provided with a sliding plate and two mounting plates, the sliding plate is fixedly connected with the light blocking plate, two mounting plates are vertically installed on both ends of the sliding plate respectively, both mounting plates are provided with circular fixing holes, the rotating shaft passes through the circular fixing holes, so that the light blocking slider can slide along the rotating shaft through the mounting plate.

4. The motor high beam / low beam switching device according to claim 3, characterized by The size of the spring is 0.2*5*5mm, the spring is placed on the rotating shaft and fixed between the two mounting plates, the spring cooperates with the rotating shaft to realize sliding and push the light blocking slider to slide.

5. The motor high beam / low beam switching device according to claim 4, characterized by Both ends of the spring are provided with fixing feet, the sliding plate is provided with a rectangular opening for fixing the fixing feet at both ends of the spring.

6. The motor high beam / low beam switching device according to claim 3, characterized by One of the mounting plates is provided with a clearance in the circular fixing hole, the clearance is used to avoid the cylindrical convex block to realize the installation of the rotating shaft and the light blocking slider.

7. The motor high beam / low beam switching device according to claim 1, characterized by The base is provided with a motor compartment, a rotating shaft compartment and a control panel compartment, the motor is installed in the motor compartment, the rotating shaft is installed in the rotating shaft compartment, and the control panel is installed in the control panel compartment.

8. The motor high beam / low beam switching device according to claim 1, characterized by The fixed plate is provided with at least one screw hole connected with the car light.

9. The motor high beam / low beam switching device according to claim 1, characterized by The control panel is FR4 circuit board, which includes: a control module, a motor driving module and a system power supply module, the control module, the motor driving module and the system power supply module are electrically connected with each other, the system power supply module is used to supply power to the control module and the motor driving module; the control module is used to detect input signal and send control signal to the motor driving module according to the input signal; the motor driving module is used to receive control signal and control the motor to rotate forward or reverse according to the control signal.

10. The motor high beam / low beam switching device according to claim 9, characterized by The system power supply module comprises a power control chip U1, a diode D1, a capacitor C1 and a capacitor C2, a positive electrode of the diode D1 is connected with a power supply voltage VCC, a negative electrode of the diode D1 is connected with a second pin of the power control chip U1, one end of the capacitor C1 is connected with the second pin of the power control chip U1, the other end of the capacitor C1 is grounded, one end of the capacitor C2 is connected with a third pin of the power control chip U1, the other end of the capacitor C2 is grounded, the third pin of the power control chip U1 outputs a working voltage VDD, and a first pin of the power control chip U1 is grounded; The control module comprises a main control chip U2, a resistor R1, a resistor R2, a bidirectional voltage stabilizing diode DZ1 and a capacitor C3, one end of the resistor R1 is connected with a signal detection port, the other end of the resistor R1 is connected with a third pin of the main control chip U2, a negative electrode of the bidirectional voltage stabilizing diode DZ1 is connected with the third pin of the main control chip U2, a positive electrode of the bidirectional voltage stabilizing diode DZ1 is grounded, one end of the resistor R2 is connected with the third pin of the main control chip U2, the other end of the resistor R2 is grounded, a second pin of the main control chip U2 is grounded, a fifth pin of the main control chip U2 is connected with the working voltage VDD, one end of the capacitor C3 is connected with the second pin of the main control chip U2, and the other end of the capacitor C3 is connected with the fifth pin of the main control chip U2; The motor driving module comprises a motor driving chip U3 and a capacitor C4, a first pin of the motor driving chip U3 is connected with a negative electrode of a motor, a sixth pin of the motor driving chip U3 is connected with a positive electrode of the motor, a third pin of the motor driving chip U3 is connected with a sixth pin of the main control chip U2, a fourth pin of the motor driving chip U3 is connected with a fourth pin of the main control chip U2, a second pin of the motor driving chip U3 is grounded, a fifth pin of the motor driving chip U3 is connected with the working voltage VDD, one end of the capacitor C4 is connected with the second pin of the motor driving chip U3, and the other end of the capacitor C4 is connected with the fifth pin of the motor driving chip U3.

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