Injection control technique for high speed switching with a double gate PNM-IGBT

Abstract

We proposed a PNM-IGBT [1] that can realize performance close to the theoretical limit shown by Nakagawa, et, al [2, 3]. In that work, we confirmed PNM-IGBT can achieve a very low saturation voltage due to its great injection enhancement effect. However, it is accompanied by a slight increase in turn-off-loss. We believe that we can diminish this increase by our unique control technique. Therefore, in this paper, we propose a fundamentally new IGBT control technique. By combining this control technique and PNM-IGBT, it becomes possible to achieve both a low saturation voltage and fast switching speed. To demonstrate the above hypothesis, we have developed a double gate PNM-IGBT, and confirmed a decrease in turn-off-loss of 30% using this technique.