A thyristor turn-off system comprising: a thyristor having at least an anode, a cathode and a gate; a first reverse-bias means for applying reverse-bias between said anode and said cathode of the thyristor; a second reverse-bias means for applying reverse-bias to said gate of the thryistor; means for...http://www.google.com.tw/patents/US4107551?utm_source=gb-gplus-share專利 US4107551 - Thyristor turn-off system
