Active discharge control circuit of motor controller of electric vehicle and controller

Abstract

The invention provides an active discharge control circuit of a motor controller of an electric vehicle and the controller, and aims to solves the conditions that burden of the controller is increased and torque abnormity, rotary speed abnormity, discharge failure and other abnormity conditions are easily caused in a discharging mode by adopting an inversion unit in the prior art. The active discharge control circuit of the motor controller of the electric vehicle comprises a discharge main circuit and a discharge control circuit; the discharge main circuit comprises a discharge resistor R1 and a thyristor VT1 which are connected in series; and the motor controller of the electric vehicle comprises a high-voltage storage battery, an inversion circuit, a low-voltage power supply circuit, a low-voltage storage battery, a direct current capacitor Cdc, an ignition switch ON, a discharge main circuit and a low-voltage control unit. By adoption of the mode that the discharge resistor and the thyristor are connected in series, the burden of the inversion unit and the control program are relieved compared with the mode of discharging by adopting the inversion unit; and active discharge still can be ensured in failure of the inversion unit, so that reliability is improved.

Description

technical field [0001] The invention relates to the field of electric vehicle motor controller capacitor discharge, in particular to an electric vehicle motor controller active discharge control circuit and controller. Background technique [0002] The main realization of the motor controller is to convert the high-voltage direct current of the power battery on the electric vehicle into a three-phase alternating current through a three-phase inverter circuit to provide power for the motor, and then provide power for the operation of the car. The motor controller mainly includes a pre-charging circuit, a DC bus capacitor, an inverter circuit, a low-voltage control circuit, and a low-voltage power supply circuit. The pre-charging circuit is to pre-charge the DC bus capacitor connected in parallel to the DC bus when the power battery is connected to the DC bus, so as to avoid large surge current. The DC bus capacitor reduces the ripple voltage generated by the switching device...

AI Technical Summary

Problems solved by technology

[0005] The invention provides an active discharge control circuit and controller for an electric vehicle motor controller, aiming at solving the problem of using an inverter unit for discharge in the prior art, which increases the burden on the controller, and is prone to abnormal torque, abnormal speed, and discharge failure and other abnormal situations

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