Overvoltage suppressing circuit for semiconductor device

Details Overvoltage suppressing circuit for semiconductor device Overvoltage suppressing circuit for semiconductor device

H - Electricity

02

H

328/198, 323/6

H02H 9/04 (2006.01) H03K 17/0814 (2006.01)

Patent

CA 1310063

ABSTRACT OF THE DISCLOSURE Disclosed is an overvoltage suppressing circuit for a semiconductor device connected between the poles of a DC power source and adapted to effect a switching operation. The circuit comprises: a serial circuit connected in parallel with a semiconductor device and including an overvoltage suppressing capacitor, an oscillation suppressing diode, and an impedance regulator connected in series each other, the impedance regulator being operable to change into a state of high impedance for suppressing a reverse current flowing into the oscillation suppressing diode when the oscillation suppressing diode is turned off; and a discharging device connected between a DC power source and the overvoltage suppressing capacitor for discharging to the DC power source a charge accumulated in the overvoltage suppressing capacitor when the oscillation suppressing diode is off.

596261

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