Paralleling power converters for AC-DC step-down power conversion with inherent power factor correction

The authors describe the modular development of a single-stage AC-DC step-d own power converter. The converter offers advantages such as simple DC-DC t ype switching control, electrically isolated output and inherent power fact or correction. It also provides single-stage power conversion without using power devices with excessively high voltage and current rating, the flexib ility for expansion of power capability, and a simplification of design and production procedure for the manufacturing of power converter products. Th e operating modes of the converter are described and analysed. Experiments have confirmed the validity of the modular converter operation.