A failure diagnosis method for an inverter circuit, which easily performs failure diagnosis of a FET of the inverter circuit without delay includes comparing a motor terminal voltage corresponding to each phase of the inverter circuit including semiconductor switching devices (FETs) to drive a motor, with a threshold voltage by comparators as voltage comparison circuitry. At this time, the threshold voltage is changed according to a high-side FET and a low-side FET on which failure diagnosis is to be performed. Subsequently, by a digital output from the comparator, whether there is a short circuit of each FET of the motor terminal voltage is determined.
FAILURE DIAGNOSIS METHOD FOR INVERTER CIRCUIT
2019-12-26
Patent
Electronic Resource
English
IPC: | H02P CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS , Steuern oder Regeln von elektrischen Motoren, elektrischen Generatoren, dynamoelektrischen Umformern / B62D MOTOR VEHICLES , Motorfahrzeuge / H02M APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS , Anlagen zur Umformung von Wechselstrom in Wechselstrom, von Wechselstrom in Gleichstrom oder umgekehrt, oder von Gleichstrom in Gleichstrom und zur Verwendung in Netzen oder ähnlichen Stromversorgungssystemen |