Power GTO with compensated ring anode short

A novel design concept for achieving superior performance of ring anode-short GTO is presented in this paper. The compensated ring anode-short is based on the nonuniform ring short pattern on the anode-side to compensate the effect of nonuniform distribution of gate turn-off reverse voltage re-biased on the cathode-side. By additional local lifetime killer of proton irradiation, the new design i.e. compensated ring anode-short, enables us to attain better turn-off performance when compared to conventional uniform ring anode-short, resulting in high turn-off ability and low tail current for high current GTOs. Experimental and manufactured devices are presented to verify the new concept.