A soft-switching universal-input voltage HPF rectifier implemented with a modified sepic converter

A high-power-factor rectifier suitable for universal-line base on a modified version of the SEPIC converter is presented in this paper. The voltage multiplier technique is applied to the classical SEPIC circuit obtaining new operation characteristics as low switch voltage operation and high static gain at low line voltage. The new configuration also allows the reduction of the losses associated to the diode reverse recovery current and soft-commutation is obtained with a simple regenerative snubber circuit. The operation analysis, design procedure and experimental results obtained from a 650W universal-line high power factor prototype of the proposed converter are presented. The theoretical analysis and experimental results obtained with the proposed structure are compared with the classical boost topology.