Drive circuit for current sense IGBT

Details Drive circuit for current sense IGBT Drive circuit for current sense IGBT

1991-07-12

1993-04-06

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 93, 361 98, 361 18, H03K 1708

Patent

active

052008789

ABSTRACT:
A drive circuit for a current sense IGBT having, in addition to a fault discrimination operational circuit for detecting an overcurrent of the current sense IGBT, a capacitor operatively connected in parallel to the gate-emitter of the current sense IGBT, and a transistor for discharging the capacitor via a resistor. In case of short-circuit fault, an overcurrent is detected by the fault discrimination operational circuit, and the transistor is turned on via the operational circuit. The gate voltage of the IGBT is gradually declined to turn off the IGBT. This enables the IGBT to be protected from a transitional overvoltage across the collector and emitter of the IGBT.

REFERENCES:
patent: 4721869 (1988-01-01), Okado
patent: 4949213 (1990-08-01), Sasagawa et al.

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