Power electronics technology has been studied in earnest for more than 40 years, and its application was limited to some electric energy. However, the positioning is going to turn big when 80% of the electric energy comes to be used through a power electronics technology from now on in 10–20 years or so. Therefore, the power electronics technology may be said to be the minimum requirement knowledge to be learned by not only the electric person concerned but also the person concerned with magnetism. The summary of the power electronics technology is described here, and the detailed explanation is carried out about one-phase inverter dynamic behavior which is said to be one of the most important fundamental concepts in power electronics technology.