US 2002/0057540 A1 · Semiconductor switching devices

Abstract

Switching elements of self-quenching function are connected in series to constitute a semiconductor switching device. A snubber circuit comprising the first diode, the first capacitor and a non-linear circuit is connected in parallel to the respective semiconductor switching element. In the snubber circuit, the first diode and the first capacitor are connected in series, and the non-linear circuit is connected in parallel to the first capacitor. The non-linear circuit comprises a 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. Said Zener voltage is larger than and has minimum latitude to divided voltage of the semiconductor element under an accident in power system.

Claims15

Dependent claims

A semiconductor switching device comprising:

semiconductor switching elements having self-quenching function and connected in series, and
snubber circuits comprising a first diode, a first capacitor and a non-linear circuit, and connected in parallel to the respective semiconductor switching element,
wherein the first diode and the first capacitor are connected in series, the non-linear circuit is connected in parallel to the first capacitor, said non-linear circuit draws current when applied voltage exceeds prescribed clamp voltage, and said clamp voltage is larger than and has minimum latitude to divided voltage corresponding to one of the semiconductor elements under an accident in power system.

Dependencies are inferred from the claim text.

Semiconductor switching devices

Life of this patent

Semiconductor switching devices

Life of this patent

Abstract

Claims15