Quasi-active power factor correction using transformer-assisted driving voltage

This paper presents a novel simple input current shaper based on a quasi-active power factor correction (PFC) scheme. In this method high power factor and low harmonic content are achieved by providing an auxiliary PFC circuit with a driving voltage derived from a third winding of the transformer of a DC-DC flyback converter. It eliminates the use of active switch and control circuit for PFC. Operating principles, analysis, and simulation results of the proposed method are presented.