Overvoltage suppressing circuit for semiconductor device

Electricity: electrical systems and devices – Safety and protection of systems and devices – Voltage regulator protective circuits

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

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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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