Capacitor switched gate-turnoff thyristor

摘要

Gate-turnoff performance of the gate-turnoff thyristor (GTO) through the transient current of a capacitor is studied. Experimental results on such a capacitor-switched GTO (CSG) show that a large negative transient current is obtained resulting from the discharge of a capacitor attached to the gate of the GTO. Very high turn-off current in the CSG can be achieved. A simple MOS-controlled gate-driving circuit is proposed which provides full voltage control of the GTO. Comparison between the CSG and the GTO-cascode switch is also carried out.