Motor controller over-current protection device, motor controller and electric car

Abstract

The application discloses a motor controller over-current protection device, a motor controller and an electric car. The motor controller over-current protection device actually collects a two-phase current signal output by a motor controller through a current sensing module, converts the two-phase current signal into a voltage signal which can be measured by an operational amplifier through a current conversion module, and compares the voltage signal with an upper threshold voltage and a lower threshold voltage to judge whether there is an over-current phenomenon. As the voltage signal is directly collected by the current sensing module, the voltage signal represents the actual current value of the motor controller, the situation in which the current value represented by the voltage signal is inconsistent with the actual current of the motor controller is avoided, and the accuracy of judgment on whether there is an over-current phenomenon in the motor controller is increased. Further, the motor controller over-current protection device realizes bilateral detection of the voltage signal, and over-current detection by the motor controller over-current protection device is more comprehensive.

Description

technical field [0001] The present application relates to the technical field of overcurrent protection, and more specifically, relates to an overcurrent protection device for a motor controller, a motor controller and an electric vehicle. Background technique [0002] Electric vehicles refer to motor vehicles that use power batteries as all or part of their power sources, including pure electric vehicles and hybrid vehicles. Electric vehicles have become the current solution for energy, Environmental issues are the first choice, which also makes the demand for electric vehicles more and more large, becoming one of the future development directions of the automobile industry. [0003] Current mainstream electric vehicles generally use permanent magnet synchronous motors as drive motors, and the rotation of the motors is controlled by a motor controller. During the running of the electric vehicle, when an overcurrent or short circuit fault occurs in the motor controller due ...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above-mentioned technical problems, the present invention provides a motor controller overcurrent protection device, a motor controller and an electric vehicle to solve the current motor controller current obtained according to the output power and torque of the drive motor in the prior art and the current motor control The problem of low accuracy in judging the overcurrent phenomenon of the motor controller caused by the inconsistency of the motor current

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