A motor controller and its current regulation method

Abstract

The invention discloses a motor controller and a current regulating method thereof, comprising a control board and a driving board, wherein the driving board includes a transformer, a driving circuit, an IGBT module, a high-voltage current sampling circuit, a switch circuit, a power management circuit and a low-voltage current sampling circuit. If the DC bus current collected by the high-voltage current sampling circuit is greater than the high-voltage overcurrent protection threshold stored in the drive circuit, the drive circuit outputs a low level to block the PWM wave, turning off the IGBT module, and then the drive circuit outputs a level reversal signal to the power management The overcurrent protection reset terminal of the circuit, the power management circuit is reset, the switching circuit is continuously turned off, the transformer stops working, and the positive / negative voltage driving the gate of the IGBT module on / off disappears; when the feedback current collected by the low-voltage current sampling circuit is too small Or when it is too large, the turn-on time of the switch circuit is controlled by the power management circuit, and then the power supply current of the low-voltage side is adjusted to make the motor controller work stably.

Description

technical field [0001] The invention belongs to the field of safety protection of a motor controller of a pure electric vehicle, and in particular relates to a motor controller and a current regulating method thereof. Background technique [0002] With the development of China's and international new energy vehicle strategic planning, new energy vehicles are accepted and loved by more and more people. As the most concerned pure electric vehicle in the field of new energy vehicles, the improvement of its safety and reliability is the unremitting goal of engineers. The motor controller is the core component of the power control of pure electric vehicles and the central brain of the car. Therefore, the stable and reliable operation of the motor controller will directly affect the safe driving of the vehicle. But in the actual driving process, the motor controller will always have overvoltage, overcurrent, overtemperature and other faults, which will cause power interruption an...

AI Technical Summary

Problems solved by technology

This method has a certain time delay from receiving the overcurrent signal to the wave sealing process of the drive circuit. This delay time may have caused the IGBT module to burn out, and this method cannot achieve current regulation.

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