System and method for safely powering on/off high-voltage circuits

Abstract

The invention discloses a system for safely powering on / off high-voltage circuits, which is used for safely powering on / off the high-voltage circuit of an electric vehicle. The system comprises an electronic control unit, a first high-voltage circuit, a relay, a second high-voltage circuit, and a time sequence control circuit, wherein the electronic control unit is used for sending a high-voltage circuit connecting signal or a high-voltage circuit disconnecting signal; the first high-voltage circuit, the relay and the second high-voltage circuit are used for connecting or disconnecting a power battery and a motor; and the time sequence control circuit is used for sequentially controlling the connection of the first high-voltage circuit after receiving the high-voltage circuit connecting signal, controlling the relay to be connected if a current change rate detected by a current sensor is smaller than a threshold value, controlling the first high-voltage circuit to be disconnected if the current change rate detected by the current sensor is smaller than the threshold value, controlling the second high-voltage circuit to be connected after receiving the high-voltage circuit disconnecting signal, controlling the relay to be disconnected, and controlling the second high-voltage circuit to be disconnected if the current change rate detected by the current sensor is smaller than the threshold value. The invention further discloses a method for safely powering on / off the high-voltage circuits.

Description

technical field [0001] The invention relates to the field of automobile electrical technology, in particular to a system and method for realizing safe power-on and power-off of high-voltage circuits. Background technique [0002] Modern electric vehicles, because they have less impact on the environment than traditional vehicles, are widely optimistic about the prospects. According to the national standard GB / T 19596, electric vehicles include pure electric vehicles, hybrid electric vehicles, and fuel cell electric vehicles. The DC voltage of the power battery used in modern electric vehicles reaches more than 300V. Therefore, the safety and stability of the circuit connection and disconnection between the power battery and the drive motor are of great significance to the long-term safe and stable operation of electric vehicles. [0003] In the prior art, electric vehicles control the high-voltage circuit by using the low-voltage circuit to control the high-voltage power swi...

AI Technical Summary

Problems solved by technology

[0005] In view of this, the main purpose of the present invention is to provide a system and method for realizing safe power-on and power-off of high-voltage circuits, so as to solve the problem that arcs may be generated when high-voltage circuits are powered on and off in the prior art, and the electrical equipment used is easily damaged and dangerous. The problem

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