*Rina Tanaka1, Katsutoshi Sugawara2, Yutaka Fukui1, Hideyuki Hatta1, Hidenori Koketsu1, Hiroyoshi Suzuki2, Yusuke Miyata1, Kensuke Taguchi2, Yasuhiro Kagawa2, Shingo Tomohisa1, Naruhisa Miura1
(1. Advanced Technology R&D Center, Mitsubishi Electric Corp.(Japan), 2. Power Device Works, Mitsubishi Electric Corp.(Japan))