Protective device for protecting insulated gate bipolar transistor of electrical controlled circuits against short circuit and overcurrent, has wiring unit whose current outputs are connected between emitter and collector of transistor

摘要

The device has a transmitter (2) connected between power control switch units (16) for protecting an insulated gate bipolar transistor (IGBT) (1). A resistive impedance type power sensor (5) is connected to a collector (3) and an emitter of the IGBT. An electronic control circuit (6) is connected between the sensor and the collector of the IGBT. An alternating current to direct current (AC-DC) rectifier (10) is connected with a power wiring unit (19). Direct current outputs (13, 13 ') of the wiring unit are connected between the emitter and the collector of the IGBT in a parallel manner.