The existing training literature on power electronics is mainly intended for specialists - developers of power electronic devices and is devoted to methods of analysis, modeling and calculation of various power electronics devices. At the same time, educational literature intended for specialists in various industries using power electronics is practically absent. This becomes especially noticeable due to the fact that the number of applications of power electronics devices has increased significantly in recent years and continues to increase. In addition to energy, this includes electric drive, transport (rail, air, road, sea), aerospace, lighting, electrical technology, etc. The book in a simple and compact form sets out the main milestones in the history of the emergence and development of power electronics based on semiconductor devices and considers its application in various fields of technology. The book is intended for students of higher educational institutions and specialists - users of power electronics.