DCDC power supply protection circuit of electric automobile

Abstract

The invention discloses a DCDC power supply protection circuit of an electric automobile. The DCDC power supply protection circuit comprises a diode, a resistor, a capacitor, a relay and a control circuit. The diode is connected with the resistor in series. The two ends of the serial-connection circuit of the diode and the resistor are connected with the input end of a power circuit and the output end of a power supply respectively. The serial-connection circuit of the diode and the resistor is connected with the relay in parallel. The two ends of the relay are connected with the input end of the power circuit and the output end of the power supply respectively. The capacitor is connected with the input end of the power circuit in parallel and connected with the serial-connection circuit of the diode and the resistor. The control circuit is connected with the control end of the power circuit and the control end of the relay. The control circuit samples the voltage of the capacitor and controls the relay to be switched on and switched off according to an external instruction and the sampling result.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a DCDC power supply protection circuit of the electric vehicle. Background technique [0002] With the development of electric vehicles, in order to ensure the power supply of low-voltage control systems of electric vehicles, DCDC power supplies for electric vehicles, as an indispensable supporting product for electric vehicle electronic control systems, have also been greatly developed. In the existing technology, power conversion is mainly realized, and the high voltage of the power battery is converted into a low voltage that can be used by the electronic control system. However, when the electric vehicle is frequently started, a surge current impact will be generated on the high-voltage power supply bus, causing the power supply bus to be disconnected from the power supply. The switching device between the DCDC power supply is damaged. Make the electronic control s...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a DCDC power supply protection circuit for electric vehicles, so as to solve the problem of surge current impact on the high-voltage power supply bus when the electric vehicle is frequently started, resulting in damage to the switching device between the power supply bus and the DCDC power supply , the problem of failure of the electronic control system and switching devices

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