Power electronics is an interdisciplinary field within electrical engineering that is concerned with the design, control and conversion of power in its electric form. A power electronic system is a system that transforms electric energy to an electric load by using a control circuit. Applications of power electronics include generation, transmission, distribution, and control of power. In daily life, power electronics is used in induction cookers, fan regulators, air conditioners, battery chargers, vacuum cleaners, and computers. Furthermore, it also has various applications in automation industry, such as trolleys, hybrid electric vehicles, and subways. It is also used for generating renewable energy, such as wind energy and solar energy. This book traces the progress in the field of power electronics and highlights some of its key concepts and applications. A number of latest researches have been included to keep the readers up-to-date with the theory, design, and applications of power elctronics. This book aims to serve as a resource guide for students and experts alike, and contribute to the growth of the discipline.