Short circuit prevention display driving circuit capable of controlling motorcycle lamp

By designing a short-circuit display driving circuit in the motorcycle headlights to detect and prevent the short-circuiting of the headlights, the short-circuit safety hazards caused by the aging of the sealing structure of the motorcycle headlights are solved, and the safety of use is improved.

CN119929035APending Publication Date: 2025-05-06CHONGQING SANSAN ELECTRIC APPLIANCE
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Patent Information

Application Number
CN202510236326.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-02-28
Publication Date
2025-05-06

AI Technical Summary

Technical Problem

Motorcycle lights are prone to infiltrating rainwater due to aging of sealing structures during long-term outdoor use, causing short circuits, and pose safety hazards.

Method used

An anti-short circuit display driving circuit including a headlight output circuit, a short-circuit detection circuit, an output detection circuit and a headlight enable circuit are designed to detect whether the headlight output circuit is short-circuited and power is cut off through the MCU to avoid leakage.

Benefits of technology

By detecting and preventing short circuits, the safety of motorcycle lights is improved, and leakage and other safety risks caused by short circuits are avoided.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention discloses a short circuit prevention display driving circuit capable of controlling a motorcycle lamp, which comprises a motorcycle lamp output circuit, a short circuit detection circuit, an output detection circuit and a motorcycle lamp enabling circuit, and is characterized in that the signal input end of the motorcycle lamp enabling circuit is connected with the motorcycle lamp enabling signal output end of a motorcycle body; the signal output end of the car lamp enable circuit is connected with the car lamp enable signal input end of the MCU, the signal input end of the car lamp output circuit is connected with the car lamp control output end of the MCU, the car lamp control output end of the car lamp output circuit is connected with a car lamp of a car body, and the short circuit detection circuit is used for detecting whether the car lamp output circuit is short-circuited or not. The output detection circuit is used for detecting whether the vehicle lamp output circuit outputs signals or not, the detection output end of the short circuit detection circuit is connected with the MCU vehicle lamp short circuit detection signal end, and the detection output end of the output detection circuit is connected with the MCU vehicle lamp output feedback signal input end. Motorcycle lamps can be controlled, short circuit detection is carried out, and the use safety is improved.
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Description

Technical Field

[0001] The invention relates to the technical field of instrument circuit control, and in particular to an anti-short-circuit display driving circuit capable of controlling a motorcycle lamp. Background Art

[0002] Motorcycle headlights are an important safety component for riding at night or in low visibility conditions. They not only help riders see the road ahead, but also allow other road users to notice the motorcycle. Common vehicle headlights are equipped with independent power supplies and control circuits because of their high power. However, this setting is not easy to route, and the control system of the vehicle computer controls more signals, which places higher requirements on the control chip of the vehicle computer and is more expensive. In addition, since motorcycles are outdoors for a long time and are exposed to the sun and rain, if the sealing structures such as waterproof strips and sealing rings age, it is easy for rainwater to penetrate and cause a short circuit, which is prone to safety hazards. Summary of the invention

[0003] The present invention aims to solve the technical problems existing in the prior art, and in particular innovatively proposes an anti-short-circuit display driving circuit capable of controlling motorcycle lights, which can control motorcycle lights and perform short-circuit detection to improve safety in use.

[0004] In order to achieve the above-mentioned purpose, the present invention provides an anti-short-circuit display driving circuit capable of controlling motorcycle lights, comprising a light output circuit, a short-circuit detection circuit, an output detection circuit and a light enabling circuit, wherein the light enabling circuit signal input end is connected to the light enabling signal output end of the vehicle body, the light enabling circuit signal output end is connected to the light enabling signal input end of an MCU, the light output circuit signal input end is connected to the light control output end of the MCU, the light output circuit light control output end is connected to the vehicle body light, the short-circuit detection circuit is used to detect whether the light output circuit is short-circuited, the output detection circuit is used to detect whether the light output circuit has an output signal, the short-circuit detection circuit detection output end is connected to the light short-circuit detection signal end of the MCU, and the output detection circuit detection output end is connected to the light output feedback signal input end of the MCU.

[0005] In the above scheme: the headlight output circuit includes one end of a resistor R46 connected to the MCU headlight control output end, the other end of the resistor R46 is connected to one end of a resistor R48, one end of a capacitor C36 and the base of a transistor Q7, the other end of the resistor R48, the other end of the capacitor C36 and the emitter of the transistor Q7 are all connected to the power ground, the collector of the transistor Q7 is connected to one end of a resistor R41 and one end of a resistor R38, the other end of the resistor R41 and the other end of the resistor R38 are both connected to the gate of the MOS tube T1 and one end of the resistor R35, the other end of the resistor R35 is connected to the power supply end of a 12V battery, the source of the MOS tube T1 is connected to one end of a resistor R26, the other end of the resistor R26 is connected to the power supply end of a 12V battery, the drain of the MOS tube T1 is the headlight control output end, and is connected to the body headlight.

[0006] In the above scheme: the short-circuit detection circuit includes a resistor R33, one end of the resistor R33 is connected to one end of the resistor R26, the other end of the resistor R33 is connected to the base of the transistor Q2, the emitter of the transistor Q2 is connected to the other end of the resistor R26 and the power supply end of the 12V battery, the collector of the transistor Q2 is connected to one end of the resistor R39, the other end of the resistor R39 is connected to the MCU car light short-circuit detection signal end and one end of the resistor R40, and the other end of the resistor R40 is connected to the power ground.

[0007] In the above scheme: the output detection circuit includes the drain of the MOS tube T1 connected to one end of the resistor R72 and one end of the capacitor C34, the other end of the resistor R72 is the output end of the headlight output feedback signal, connected to the MCU headlight output feedback signal input end, one end of the capacitor C33 and one end of the resistor R73, the other end of the capacitor C33, the other end of the resistor R73 and the other end of the capacitor C34 are connected to the power ground.

[0008] In the above scheme: the headlight enabling circuit includes one end of a resistor R49 connected to the output end of a headlight enabling signal of a vehicle body, the other end of the resistor R49 connected to one end of a resistor R50 and one end of a resistor R51, the other end of the resistor R50 connected to the input end of a headlight enabling signal of an MCU and one end of a capacitor C25, and the other end of the resistor R51 and the other end of the capacitor C25 are both connected to a power ground.

[0009] In the above scheme: it also includes a power supply module, the power supply module includes a positive electrode of a diode D6 connected to a positive electrode of a diode D1, one end of a capacitor C5, one end of a capacitor C6, one end of a capacitor C7, one end of a capacitor C8 and a power supply end of the vehicle machine ACC, a negative electrode of a diode D6 connected to a negative electrode of a diode D1, one end of an electrolytic capacitor EC1, one end of a capacitor C9, one end of a capacitor C10, one end of a capacitor C11, one end of a capacitor C12 and a Drain end of a DC-DC power supply chip U1, the other end of a capacitor C5, the other end of a capacitor C6, the other end of a capacitor C7, the other end of a capacitor C8, the other end of an electrolytic capacitor EC1, the other end of a capacitor C9, the other end of a capacitor C10, the other end of a capacitor C11 and the other end of a capacitor C12 are all connected to a power ground, a working voltage end of a DC-DC power supply chip U1 is connected to one end of a capacitor C4, the other end of a capacitor C4 is connected to a ground end of a DC-DC power supply chip U1, and a DC-DC power supply chip U1 is grounded. The feedback end of chip U1 is connected to one end of resistor R3 and one end of resistor R10, and the other end of resistor R10 is connected to the ground end of DC-DC power chip U1. The other end of resistor R3 is the SY_5V end of the power module, which outputs 5V voltage. The other end of resistor R3 is connected to one end of inductor L1, one end of electrolytic capacitor EC3, one end of electrolytic capacitor EC4, one end of electrolytic capacitor EC2 and one end of resistor R13; one end of inductor L1 is connected to the ground end of DC-DC power chip U1, one end of resistor R12 and one end of Schottky diode D2, the other end of inductor L1, the other end of electrolytic capacitor EC3, the other end of electrolytic capacitor EC4, the other end of electrolytic capacitor EC2, the other end of resistor R12, the other end of resistor R13 and the other two ends of Schottky diode D2 are all connected to the power ground, the CS end of DC-DC power chip U1 is connected to one end of resistor R9, and the other end of resistor R9 is connected to the ground end of DC-DC power chip U1.

[0010] The present invention also discloses a short-circuit-proof display driving working method capable of controlling a motorcycle lamp, comprising the following steps:

[0011] S1, MCU determines whether it has received the control signal to turn on the motorcycle lights:

[0012] If the MCU does not receive the control signal to turn on the motorcycle lights, it will proceed to the next step;

[0013] If the MCU receives a control signal for turning on the motorcycle lights, step S4 is executed;

[0014] S2, MCU outputs the light-off level to the MCU light control output terminal, so that the transistor Q7 is in the cut-off state;

[0015] S3, the MCU determines whether the short-circuit detection signal received by the MCU headlight short-circuit detection signal terminal is less than or equal to the preset short-circuit voltage value:

[0016] If the short-circuit detection signal received by the MCU headlight short-circuit detection signal terminal is less than or equal to the preset short-circuit voltage value, it means that the headlight disconnection level output by the MCU to the MCU headlight control output terminal is correct; at this time, the motorcycle headlights are not lit;

[0017] If the short-circuit detection signal received by the MCU headlight short-circuit detection signal terminal is greater than the preset short-circuit voltage value, it means that the headlight disconnection level output by the MCU to the MCU headlight control output terminal is incorrect and needs to be repaired;

[0018] S4, MCU outputs the light-on level to the MCU light control output terminal, so that the transistor Q7 is in the on state;

[0019] S5, the MCU determines whether the short-circuit detection signal received by the MCU headlight short-circuit detection signal terminal is less than or equal to a preset short-circuit voltage value:

[0020] If the short-circuit detection signal received by the MCU headlight short-circuit detection signal terminal is less than or equal to the preset short-circuit voltage value, it means that the headlight disconnection level output by the MCU to the MCU headlight control output terminal is incorrect and needs to be repaired;

[0021] If the short-circuit detection signal received by the MCU headlight short-circuit detection signal terminal is greater than the preset short-circuit voltage value, it means that the headlight disconnection level output by the MCU to the MCU headlight control output terminal is correct; proceed to the next step;

[0022] S6, the MCU determines whether the feedback detection signal received by the MCU headlight output feedback signal input terminal is greater than or equal to the preset feedback voltage value:

[0023] If the feedback detection signal received by the MCU headlight output feedback signal input terminal is greater than or equal to the preset feedback voltage value, it means that the motorcycle headlight power supply is normal, and the next step is executed;

[0024] If the feedback detection signal received by the MCU headlight output feedback signal input terminal is less than the preset feedback voltage value, it means that the motorcycle headlight power supply is abnormal and needs to be repaired;

[0025] S7, judging whether the motorcycle lights are on:

[0026] If the motorcycle lights are on, you can drive on the road with the motorcycle lights on;

[0027] If the motorcycle lights are not on, it means that the motorcycle lights are damaged and need to be replaced. To detect whether the motorcycle lights are on, a light sensor can be set to detect.

[0028] In summary, the beneficial effects of the present invention are: the headlights of a motorcycle can be driven by the instrument circuit, and at the same time, whether a short circuit occurs can be detected. Since the instruments and lights of the motorcycle are exposed to the outside, if a short circuit occurs due to rain or other reasons, the MCU can be used to drive the instrument to cut off the power, thereby avoiding leakage and improving driving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a system diagram of the present invention.

[0030] Figure 2 This is a circuit diagram of a car light output circuit, a short circuit detection circuit, and an output detection circuit.

[0031] Figure 3 It is the headlight enabling circuit.

[0032] Figure 4 This is the circuit diagram of the power module.

[0033] Figure 5 A three-dimensional schematic diagram of the present invention Figure 1 .

[0034] Figure 6 A three-dimensional schematic diagram of the present invention Figure 2 .

[0035] Figure 7 It is a schematic diagram of the present invention.

[0036] Figure 8 It is a schematic diagram of the front cover in the present invention.

[0037] Fig. 9 It is a schematic diagram of the back cover in the present invention.

[0038] Fig.10 It is a schematic diagram of the bracket and the indicator panel in the present invention.

[0039] Fig.11 It is a schematic diagram of the bracket and the PCB board in the present invention.

[0040] Fig.12 Schematic diagram of the support in the present invention. DETAILED DESCRIPTION

[0041] The present invention will be further described below by way of embodiments and in conjunction with the accompanying drawings:

[0042] like Figures 1 to 12As shown, a short-circuit proof display driving circuit capable of controlling motorcycle lights comprises a light output circuit, a short-circuit detection circuit, an output detection circuit and a light enabling circuit, wherein the light enabling circuit signal input terminal is connected to the light enabling signal output terminal of the vehicle body, the light enabling circuit signal output terminal is connected to the light enabling signal input terminal of the MCU, the light output circuit signal input terminal is connected to the light control output terminal of the MCU, the light output circuit light control output terminal is connected to the vehicle body light, the short-circuit detection circuit is used to detect whether the light output circuit is short-circuited, the output detection circuit is used to detect whether the light output circuit has an output signal, the short-circuit detection circuit detection output terminal is connected to the light short-circuit detection signal terminal of the MCU, and the output detection circuit detection output terminal is connected to the light output feedback signal input terminal of the MCU.

[0043] The headlight output circuit includes a resistor R46 connected to the MCU headlight control output terminal at one end, the other end of the resistor R46 connected to the resistor R48, the capacitor C36 and the base of the transistor Q7, the other end of the resistor R48, the other end of the capacitor C36 and the emitter of the transistor Q7 are all connected to the power ground, the collector of the transistor Q7 is connected to the resistor R41 and the resistor R38, the other end of the resistor R41 and the other end of the resistor R38 are connected to the gate of the MOS tube T1 and the resistor R35 at one end. , the other end of the resistor R35 is connected to the 12V battery power supply end, the source of the MOS tube T1 is connected to one end of the resistor R26 and one end of the resistor R33, the other end of the resistor R33 is connected to the base of the transistor Q2, the other end of the resistor R26 is connected to the emitter of the transistor Q2 and the 12V battery power supply end, the collector of the transistor Q2 is connected to one end of the resistor R39, the other end of the resistor R39 is connected to the MCU headlight short circuit detection signal end and one end of the resistor R40, and the other end of the resistor R40 is connected to the power ground;

[0044] The drain of MOS tube T1 is the light control output end, connected to the body light, the drain of MOS tube T1 is connected to one end of resistor R72 and one end of capacitor C34, the other end of resistor R72 is the light output feedback signal output end, connected to the MCU light output feedback signal input end, one end of capacitor C33 and one end of resistor R73, the other end of capacitor C33, the other end of resistor R73 and the other end of capacitor C34 are connected to the power ground;

[0045] The headlight enabling circuit includes one end of a resistor R49 connected to the output end of a headlight enabling signal of a vehicle body, the other end of the resistor R49 connected to one end of a resistor R50 and one end of a resistor R51, the other end of the resistor R50 connected to the input end of a headlight enabling signal of an MCU and one end of a capacitor C25, and the other end of the resistor R51 and the other end of the capacitor C25 are both connected to the power ground.

[0046] The power module includes a diode D6 positive electrode connected to the positive electrode of the diode D1, one end of the capacitor C5, one end of the capacitor C6, one end of the capacitor C7, one end of the capacitor C8 and the ACC power supply end of the vehicle machine, a diode D6 negative electrode connected to the negative electrode of the diode D1, one end of the electrolytic capacitor EC1, one end of the capacitor C9, one end of the capacitor C10, one end of the capacitor C11, one end of the capacitor C12 and the DC-DC power chip U1Drain end, the other end of the capacitor C5, the other end of the capacitor C6, the other end of the capacitor C7, the other end of the capacitor C8, the other end of the electrolytic capacitor EC1, the other end of the capacitor C9, the other end of the capacitor C10, the other end of the capacitor C11, and the other end of the capacitor C12 are all connected to the power ground, the working voltage end of the DC-DC power chip U1 is connected to one end of the capacitor C4, the other end of the capacitor C4 is connected to the ground end of the DC-DC power chip U1, and the feedback end of the DC-DC power chip U1 is connected One end of resistor R3 and one end of resistor R10, the other end of resistor R10 is connected to the ground end of DC-DC power chip U1, the other end of resistor R3 is the SY_5V end of the power module, outputting 5V voltage, the other end of resistor R3 is connected to one end of inductor L1, one end of electrolytic capacitor EC3, one end of electrolytic capacitor EC4, one end of electrolytic capacitor EC2 and one end of resistor R13; one end of inductor L1 is connected to the ground end of DC-DC power chip U1, one end of resistor R12 and one end of Schottky diode D2, the other end of inductor L1, the other end of electrolytic capacitor EC3, the other end of electrolytic capacitor EC4, the other end of electrolytic capacitor EC2, the other end of resistor R12, the other end of resistor R13 and the other two ends of Schottky diode D2 are all connected to the power ground, the CS end of DC-DC power chip U1 is connected to one end of resistor R9, and the other end of resistor R9 is connected to the ground end of DC-DC power chip U1.

[0047] The present invention also discloses a short-circuit-proof display driving working method capable of controlling a motorcycle lamp, comprising the following steps:

[0048] S1, MCU determines whether it has received the control signal to turn on the motorcycle lights:

[0049] If the MCU does not receive the control signal to turn on the motorcycle lights, it will proceed to the next step;

[0050] If the MCU receives a control signal for turning on the motorcycle lights, step S4 is executed;

[0051] S2, MCU outputs the light-off level to the MCU light control output terminal, so that the transistor Q7 is in the cut-off state;

[0052] S3, the MCU determines whether the short-circuit detection signal received by the MCU headlight short-circuit detection signal terminal is less than or equal to the preset short-circuit voltage value:

[0053] If the short-circuit detection signal received by the MCU headlight short-circuit detection signal terminal is less than or equal to the preset short-circuit voltage value, it means that the headlight disconnection level output by the MCU to the MCU headlight control output terminal is correct; at this time, the motorcycle headlights are not lit;

[0054] If the short-circuit detection signal received by the MCU headlight short-circuit detection signal terminal is greater than the preset short-circuit voltage value, it means that the headlight disconnection level output by the MCU to the MCU headlight control output terminal is incorrect and needs to be repaired;

[0055] S4, MCU outputs the light-on level to the MCU light control output terminal, so that the transistor Q7 is in the on state;

[0056] S5, the MCU determines whether the short-circuit detection signal received by the MCU headlight short-circuit detection signal terminal is less than or equal to a preset short-circuit voltage value:

[0057] If the short-circuit detection signal received by the MCU headlight short-circuit detection signal terminal is less than or equal to the preset short-circuit voltage value, it means that the headlight disconnection level output by the MCU to the MCU headlight control output terminal is incorrect and needs to be repaired;

[0058] If the short-circuit detection signal received by the MCU headlight short-circuit detection signal terminal is greater than the preset short-circuit voltage value, it means that the headlight disconnection level output by the MCU to the MCU headlight control output terminal is correct; proceed to the next step;

[0059] S6, the MCU determines whether the feedback detection signal received by the MCU headlight output feedback signal input terminal is greater than or equal to the preset feedback voltage value:

[0060] If the feedback detection signal received by the MCU headlight output feedback signal input terminal is greater than or equal to the preset feedback voltage value, it means that the motorcycle headlight power supply is normal, and the next step is executed;

[0061] If the feedback detection signal received by the MCU headlight output feedback signal input terminal is less than the preset feedback voltage value, it means that the motorcycle headlight power supply is abnormal and needs to be repaired;

[0062] S7, judging whether the motorcycle lights are on:

[0063] If the motorcycle lights are on, you can drive on the road with the motorcycle lights on;

[0064] If the motorcycle lights are not on, it means that the motorcycle lights are damaged and need to be replaced. To detect whether the motorcycle lights are on, a light sensor can be set to detect.

Claims

1. A short-circuit proof display driving circuit capable of controlling a motorcycle light, characterized in that: The invention comprises a headlight output circuit, a short circuit detection circuit, an output detection circuit and a headlight enabling circuit, wherein the headlight enabling circuit signal input end is connected to the headlight enabling signal output end of the vehicle body, the headlight enabling circuit signal output end is connected to the headlight enabling signal input end of the MCU (U16), the headlight output circuit signal input end is connected to the headlight control output end of the MCU (U16), the headlight output circuit headlight control output end is connected to the vehicle body headlight, the short circuit detection circuit is used to detect whether the headlight output circuit is short-circuited, the output detection circuit is used to detect whether the headlight output circuit has an output signal, the short circuit detection circuit detection output end is connected to the headlight short circuit detection signal end of the MCU (U16), and the output detection circuit detection output end is connected to the headlight output feedback signal input end of the MCU (U16).

2. The short-circuit proof display driving circuit capable of controlling a motorcycle light according to claim 1, characterized in that: The headlight output circuit includes a resistor R46, one end of which is connected to the headlight control output end of the MCU (U16); the other end of the resistor R46 is connected to one end of the resistor R48, one end of the capacitor C36 and the base of the transistor Q7; the other end of the resistor R48, the other end of the capacitor C36 and the emitter of the transistor Q7 are all connected to the power ground; the collector of the transistor Q7 is connected to one end of the resistor R41 and one end of the resistor R38; the other end of the resistor R41 and the other end of the resistor R38 are both connected to the gate of the MOS tube T1 and one end of the resistor R35; the other end of the resistor R35 is connected to the power supply end of the 12V battery; the source of the MOS tube T1 is connected to one end of the resistor R26; the other end of the resistor R26 is connected to the power supply end of the 12V battery; the drain of the MOS tube T1 is the headlight control output end, which is connected to the body headlight.

3. The short-circuit proof display driving circuit capable of controlling a motorcycle light according to claim 2, characterized in that: The short-circuit detection circuit includes a resistor R33, one end of which is connected to one end of a resistor R26, the other end of which is connected to the base of a transistor Q2, the emitter of which is connected to the other end of the resistor R26 and the power supply end of a 12V battery, the collector of the transistor Q2 is connected to one end of a resistor R39, the other end of which is connected to the MCU (U16) headlight short-circuit detection signal end and one end of a resistor R40, and the other end of the resistor R40 is connected to the power ground.

4. The short-circuit proof display driving circuit capable of controlling a motorcycle light according to claim 2, characterized in that: The output detection circuit includes the drain of the MOS tube T1 connected to one end of the resistor R72 and one end of the capacitor C34, the other end of the resistor R72 is the output end of the headlight output feedback signal, connected to the headlight output feedback signal input end of the MCU (U16), one end of the capacitor C33 and one end of the resistor R73, the other end of the capacitor C33, the other end of the resistor R73 and the other end of the capacitor C34 are connected to the power ground.

5. The short-circuit proof display driving circuit capable of controlling a motorcycle light according to claim 1, characterized in that: The headlight enabling circuit includes a resistor R49, one end of which is connected to the headlight enabling signal output end of the vehicle body, the other end of which is connected to one end of a resistor R50 and one end of a resistor R51, the other end of which is connected to the headlight enabling signal input end of the MCU (U16) and one end of a capacitor C25, and the other ends of the resistor R51 and the other ends of the capacitor C25 are both connected to the power ground.

6. The short-circuit proof display driving circuit capable of controlling a motorcycle light according to claim 1, characterized in that: It also includes a power supply module, wherein the power supply module includes a positive electrode of a diode D6 connected to a positive electrode of a diode D1, one end of a capacitor C5, one end of a capacitor C6, one end of a capacitor C7, one end of a capacitor C8 and a power supply end of the vehicle machine ACC; a negative electrode of a diode D6 connected to a negative electrode of a diode D1, one end of an electrolytic capacitor EC1, one end of a capacitor C9, one end of a capacitor C10, one end of a capacitor C11, one end of a capacitor C12 and a Drain end of a DC-DC power supply chip U1; the other ends of capacitors C5, C6, C7, C8, electrolytic capacitor EC1, C9, C10, C11 and C12 are all connected to a power ground; a working voltage end of a DC-DC power supply chip U1 is connected to one end of a capacitor C4; the other end of a capacitor C4 is connected to a ground end of a DC-DC power supply chip U1; and a DC-DC power supply chip U1 is connected to a ground end. The feedback end is connected to one end of resistor R3 and one end of resistor R10, the other end of resistor R10 is connected to the ground end of DC-DC power chip U1, the other end of resistor R3 is the SY_5V end of the power module, outputting 5V voltage, the other end of resistor R3 is connected to one end of inductor L1, one end of electrolytic capacitor EC3, one end of electrolytic capacitor EC4, one end of electrolytic capacitor EC2 and one end of resistor R13; one end of inductor L1 is connected to the ground end of DC-DC power chip U1, one end of resistor R12 and one end of Schottky diode D2, the other end of inductor L1, the other end of electrolytic capacitor EC3, the other end of electrolytic capacitor EC4, the other end of electrolytic capacitor EC2, the other end of resistor R12, the other end of resistor R13 and the other two ends of Schottky diode D2 are all connected to the power ground, the CS end of DC-DC power chip U1 is connected to one end of resistor R9, and the other end of resistor R9 is connected to the ground end of DC-DC power chip U1.