High-voltage discharge method and circuit used for motor controller, and electric vehicle equipped with circuit

Abstract

The invention discloses a high-voltage discharge method and circuit used for a motor controller, and an electric vehicle equipped with the circuit. The high-voltage discharge method comprises the steps that a central processing unit obtains the momentary power outage voltage of an energy storage unit collected by a voltage acquisition unit when the motor controller suffers from high-voltage power outage; the central processing unit determines whether the momentary power outage voltage is higher than a safe voltage threshold value or not; and if so, the central processing unit controls a switch unit to be started so as to discharge the energy stored by the energy storage unit through a resistor which is connected in series with the switch unit. Therefore, according to the active resistive type discharging method, the high-voltage discharging mode can be started only when the voltage of the energy storage unit at the high-voltage line end is higher than the safe voltage threshold value, so that the energy consumption of the motor controller in an normal operation is effectively reduced; the controllability of the resistive type discharging is improved; and meanwhile, the safety of the high-voltage discharge is improved as well.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a high-voltage discharge method for a motor controller, a circuit and an electric vehicle with the circuit. Background technique [0002] In the field of electric vehicles, the motor controller is powered by the battery module, and its voltage is extremely high, generally above 400V. When the positive and negative relays connected to the battery module are disconnected, the energy-storing components (such as film capacitors) at both ends of the high-voltage positive and negative electrodes still store high-voltage energy. If the energy cannot be released in time and quickly, there will be extreme big security risk. For this reason, there are two ways of active discharge and passive discharge. [0003] At present, passive discharge usually adopts figure 1 The form shown is a schematic diagram of the circuit structure of the motor controller discharge in the prior art....

AI Technical Summary

Problems solved by technology

Since this method discharges through high voltage, there are also potential safety hazards

[0012] Therefore, the existing high-voltage discharge technology has the defect of high energy consumption, and cannot guarantee the safety of high-voltage discharge

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