Patent ID: 6639767
Filing Date: 2003-10-28
Classification: H02M,H03K

Abstract:
A semiconductor switching device comprising:self-quenching semiconductor switching elements, and snubber circuits comp sing a first diode, a first capacitor, and a non-linear circuit, and connected in parallel to respective semiconductor switching elements, wherein the first diode and the first capacitor are connected in series and connected in parallel to the semiconductor switching element, the non-linear circuit is connected in parallel with the first capacitor, and the non-linear circuit draws current when an applied voltage exceeds a first clamp voltage, and said non-linear circuit comprises a first impedance element and non-linear units having non-linear voltage-current characteristics, the first impedance element and the non-linear units are connected in series, and including a second impedance element connected between a high voltage side of the semiconductor switching element and a connecting point of the non-linear units.