A Three-Phase Single-Switch High Power Factor Buck-Type Converter Operating with Soft-Switching

This paper proposes a three-phase, single-switch, quasi-resonant, buck converter that can operate with input power factor correction. The converter can operate with a narrower switching frequency range and can therefore perform power factor correction over a wider range of line and load conditions than other converters of the same type. In the paper, the operation of the converter is discussed, a mathematical analysis of its steady-state characteristics is performed, and a design procedure is presented. The feasibility of the converter is confirmed with experimental results obtained from a prototype.