Semiconductor switching device

Details Semiconductor switching device Semiconductor switching device

2006-03-07

2006-03-07

Sircus, Brian (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

C361S091700

Reexamination Certificate

active

07009828

ABSTRACT:
Self-quenching switching elements are connected in series in a semiconductor switching device. Snubber circuits including a diode, a capacitor, and a non-linear circuit are connected in parallel with the respective semiconductor switching elements. In the snubber circuit, the diode and the capacitor are connected in series, and the non-linear circuit is connected in parallel with the capacitor. The non-linear circuit includes an impedance element, a Zener diode, and a controlling semiconductor element and draws current through the controlling semiconductor element when applied voltage exceeds the Zener voltage of the Zener diode. The Zener voltage is larger than a divided voltage applied to the semiconductor element during a fault in a power system.

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Ito et al.; “Novel Low Loss Active Voltage Clamp Circuit for Series Connection Of GCT thyristors”, 33rdIEEE Power Electronics Specialists Conference, Jun. 23-27, 2002, Cairns, Australia.

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