Fault diagnosis system of power converter for electric vehicle

A fault diagnosis system of a power converter for an electric vehicle, the system comprising:

• a power supply supplied with power and converting the supplied power to provide the power to at least one of a motor, a battery, or an electronic device of a vehicle;
• a controller connected to the power supply by a connector and controlling charging and discharging of the battery, and operations of the motor and the electronic device of the vehicle by using the power provided from the power supply;
• and
• a fault diagnosis circuit connected between the power supply and the controller and diagnosing whether the connector, which connects the power supply with the controller, malfunctions,
• wherein the fault diagnosis circuit includes:
• a current transformer connected to the power supply and converting a current supplied from the power supply;
• a rectifier rectifying a current supplied from the current transformer;
• and
• a fault determination circuit connected to the rectifier by the connector and connected to the controller, and determining whether the connector, which connects the power supply with the controller, malfunctions,
• wherein the fault determination circuit includes:
• a reference voltage source supplying a reference voltage for determining a fault;
• and
• a comparator supplied with the reference voltage from the reference voltage source and an output voltage of the rectifier and comparing the voltages to each other,
• wherein the fault determination circuit determines whether the connector, which connects the power supply with the controller, malfunctions, according to an output value of the comparator, and
• wherein a magnitude of the reference voltage is determined in a range between a magnitude of a voltage output from an output terminal of the rectifier by the reference voltage source when the connector which connects the power supply with the controller is in a normal state and a magnitude of a voltage output from the output terminal of the rectifier by the reference voltage source when the connector which connects the power supply with the controller is in an abnormal state.