An Optimized Isolated Swiss-Forward Three-Phase Rectifier

Swiss-rectifier (SR) is a novel type of rectifier structure which contains a three phase unfolder circuit and two symmetric DC-DC converters. In order to implement a simplified isolated rectifier system, two forward converters or phase-shift full bridge converters are used to achieve power factor correction (PFC). However, this kind of replacement requires two same transformers. 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.