Vehicle-mounted power supply circuit resistant to electric transient conduction

Abstract

The invention provides a vehicle-mounted power supply circuit resistant to electric transient conduction. The circuit comprises a power input end and a power output end; a capacitor C1 and a bidirectional clamping diode D1 which are connected in parallel between a live wire end and a grounding end of the power supply input end; and diode D2, wherein the cathode of the diode D2 is connected to thepower supply input end; the anode of the diode D2 is connected to the emitter of a switching tube Q1; the collector of the switching tube Q1 is connected to a pump voltage control end; the base electrode of the switching tube Q1 is connected to one end of a current-limiting resistor R1; the other end of the current-limiting resistor R1 is connected to a grounding end; the live wire end of the power supply input end is also connected with the source electrode of a switching tube Q2; the drain electrode of the switching tube Q2 is the positive electrode end of the power supply output end; the grid electrode of the switching tube Q2 is connected with the pump voltage control end; the drain electrode of the switching tube Q2 is connected with the positive electrode of an electrolytic capacitorC2 and one end of a capacitor C3; and the negative electrode of the electrolytic capacitor C2 and the other end of the capacitor C3 are connected with the grounding end. The vehicle-mounted power supply circuit is simple in structure, good in reliability and capable of meeting the requirements for large current and low cost.

Description

technical field [0001] The invention relates to a vehicle-mounted power supply circuit, in particular to a voltage-stabilized power supply circuit capable of meeting ISO7637-2 electrical transient conduction along a power line, specifically a vehicle-mounted power supply circuit resistant to electrical transient conduction. Background technique [0002] In the complex environment of on-board equipment, if the on-board equipment or system is to operate normally, the equipment or system needs to withstand the interference of various types of electromagnetic energy, which is called EMS (Electro Magnetic Susceptibility). Reliability, the International Automotive Electronics Standards System Organization clearly stipulates the EMS requirement levels such as conduction immunity, radiation immunity and electrostatic discharge in the standard ISO7637-2. [0003] In order to improve the anti-transient conduction capability of the on-board power supply system, there are two methods fo...

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Problems solved by technology

[0003] In order to improve the anti-transient conduction capability of the on-board power supply system, there are two methods for the current on-board power supply circuit: one is to use anti-reverse diodes, add capacitors and clamp diodes (TVS tubes) to resist transient conduction, and the circuit structure is simple. However, the power supply current of this power supply system is small, and it is difficult to meet the needs of the current vehicle power supply system; the other is to use PMOS (P-channel metal oxide semiconductor) instead of anti-reverse diodes to enhance its power supply current capability. High current PMOS is expensive

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