Electric vehicle three-phase motor fault detection protection device

The utility model provides a fault detection and protection device for a three-phase motor of an electric vehicle, which relates to the technical field of low-voltage electrical fire monitoring and mainly comprises a current signal acquisition module, a control module and a fault detection module, the current signal is processed by the rectifying operational amplifier circuit and then converted into a pulse signal by the voltage comparison module, and the pulse signal is input to the microprocessor for three-phase current balance judgment; if the three-phase current is unbalanced, a single-phase loop current detection circuit is activated; collected single-phase current is processed by the signal conditioning circuit and then is input into the microprocessor. The high-frequency signal pulse count detected by the microprocessor exceeds a certain threshold value, it is judged that an arc fault occurs, and the main control switch is controlled to carry out breaking protection on a three-phase motor circuit. 本实用新