Electric Vehicle Drive System and Its Bus Capacitor Discharging Method

Abstract

The invention relates to an electromobile driving system and a bus capacity discharge method thereof. The electromobile driving system comprises a motor controller, a driving force power supply, a control power supply, a motor and a vehicle control unit, wherein the motor controller comprises a motor main control unit, a bus capacitor and a three-phase full-bridge power module;the bus capacitor is connected to a direct current bus of the driving force power supply in parallel, the motor main control unit is powered by the control power supply when being started and controls the three-phase full-bridge power module to reversely convert direct current of the bus capacitor to alternating current to be output to the motor; the motor controller further comprises a voltage conversion unit; the motor main control unit transmits an enabling signal to the voltage conversion unit when receiving a discharge instruction sent by the vehicle control unit, and the voltage conversion unit is used for converting the direct current of the bus capacitor to work voltage to power the motor main control unit. According to the electromobile driving system and the bus capacity discharge method thereof, energy of the bus capacitor is fast released in an active consumption mode, energy consumption is reduced, and data storage is facilitated by the capability of delayed power-off of the motor main control unit.

Description

technical field [0001] The invention relates to the technical field of power electronics, and more specifically, relates to an electric vehicle drive system and a method for discharging a bus capacitor. Background technique [0002] Such as figure 1 As shown, the existing electric vehicle drive system mainly includes a motor controller 10 , a power supply 20 , a control power supply 30 , a motor 40 and a vehicle controller 50 . Wherein, the power supply 20 is a high-voltage storage battery, and the control power supply 30 is a low-voltage storage battery. The motor controller 10 includes a motor main control unit 11 and a power part. The control power supply 30 provides control power for the motor main control unit 11 , and the motor main control unit 11 receives a control signal from the vehicle controller 50 to control the operation of the power part. The power part of the motor controller 10 includes electrical and electronic devices such as bus capacitors 12 , three-p...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an electric vehicle drive that actively converts the bus capacitor into control electricity to supply power to the main control unit of the motor, aiming at the defect that the bus capacitor of the existing electric vehicle drive system adopts a passive discharge method to cause energy waste. System and its bus capacitor discharge method

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