Embedded AC-DC Power Supplies
Technical Dialogue Session
Swiss-rectifier, power factor correction,double-forward structure,single transform
Swiss-rectifier (SR) is a family of high efficient AC-DC topologies. It's a combination of a three phase unfolder circuit which can convert the three-phase AC voltage into two sets of cyclically varying DC voltages and two symmetric DC-DC converters to achieve power factor correction (PFC). In order to implement a simplified isolated rectifier system, a forward or full bridge converter is used to replace the buck topology in the original Swiss rectifier. However, this kind of replacement requires two transformers of the same power level. Using more than one transformer is not conducive to the reduction of the volume. Therefore, an optimized isolated Swiss forward rectifier (OSFR) is proposed. Only one double-forward structure is used when the power is transmitting. Two voltage clamp branches are used to implement the PFC principle of the SWISS-rectifier. The principle of the operation is discussed specifically. The performances of the proposed converter are verified on a prototype with 90kHz switching frequency.