Overvoltage suppressing circuit for semiconductor device

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

1989-04-13

1990-05-01

Deboer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Voltage regulator protective circuits

361 56, 361 58, 361 91, 361111, 323276, 363 56, H02H 710

Patent

active

049223658

ABSTRACT:
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.

REFERENCES:
patent: 3736495 (1973-05-01), Calkin et al.
patent: 3835368 (1974-09-01), Williams
patent: 4329729 (1982-05-01), Knight
Nair, et al., "Voltage Clamp Circuits For A Power Mosfet PWM Inverter"; pp. 911-920; IEEE Transactions of Industry Applications, vol. 1A-23, No. 5 Sep./Oct. 1987.

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