Increased efficiency in power electronic converters of all types and ratings is of considerable interest, not only from the viewpoint of improved converter thermal management but also from an environmental perspective. This important book describes the advantages and challenges, underlying the theory, and applications of high-efficiency AC-DC converters that are built into circuits, an increasingly popular design approach in power electronics. Applications covered include PSR battery chargers, high-switching frequency AC-DC converters with WBG devices, and LED lighting designs. Researchers, students and designers working in power electronics, and academics in electrical/electronic engineering will find this book invaluable.