A car motor controller

Abstract

The invention discloses a motor controller of an automobile. The motor controller comprises a motor, a motor controller body and a power supply battery. The motor controller body comprises an inverter circuit, a microprocessor and an overvoltage clamped soft protection system, at least one relay switch is arranged on direct-current bus, the power supply battery and the inverter circuit can be powered on or powered off under the control of the relay switches, the overvoltage clamped soft protection system can be started when the relay switches are abnormally tripped off and comprises a direct-current bus voltage quick detection circuit and the microprocessor, predicted voltage values are stored in the microprocessor and are compared to real-time voltage values by the microprocessor. The motor controller has the advantages that multi-channel control signals can be outputted by the microprocessor when the real-time voltage values are higher than the predicted voltage values, IGBT (insulated gate bipolar transistors) of upper bridge arms of various bridge arms are turned off under the control of the multi-channel control signals, IGBT of lower bridge arms are turned on under the control of the multi-channel control signals, voltages at two ends of each IGBT can be clamped, and accordingly effects of protecting the IGBT can be realized; the effects of protecting the IGBT can be realized by the motor controller, and accordingly the reliability and the safety of the motor controller can be improved.

Description

Technical field: [0001] The invention relates to an automobile motor controller. Background technique: [0002] Such as figure 1 , figure 2 As shown, the driving system of the car includes a vehicle controller, a motor controller and a motor. The motor controller includes a microprocessor, an inverter circuit, a power supply battery, and relay switches K2, K3, and K4 arranged on the DC bus. The relay switch The control terminals of K2, K3 and K4 are connected to the vehicle controller, and the relay switches K2 and K4 are connected in series to the DC bus to control the power on or off of the DC bus. [0003] During the operation of the whole vehicle installed with our automobile motor controller in the early stage, when the relay at the bus end is disconnected abnormally, such as figure 2 As shown, if the relay K2 or K4 is abnormally disconnected during driving, the IGBT inside the motor controller will be damaged, which will affect the reliability and safety of the ve...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of automobile motor controller, which solves the problem that in the prior art, during the operation of the whole vehicle, when the automobile motor controller is in normal operation, the relays K2 and K4 at the bus end jump off abnormally, causing the bus voltage to rise sharply. The problem of IGBT overvoltage breakdown

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