A single-phase single-stage AC-DC stacked flyback converter with active clamp ZVS

A new single-phase single-stage AC-DC converter that uses stacked flyback converters is proposed in this paper. The proposed converter consists of two lower power flyback converters stacked on top of each other and a single active clamp that helps the main converter switches operate with ZVS. In the paper, the operation of the converter is explained, its features are stated and the extension of the stacked converter concept to other single-stage AC-DC converters is discussed. The feasibility of the new converter is confirmed with experimental results obtained from a prototype converter.