A novel single-stage high-power-factor ac/dc converter featuring high circuit efficiency

This paper proposes a novel single-stage high-power-factor ac/dc converter with symmetrical topology. The circuit topology is derived from the integration of two buck-boost power-factor-correction converters and a full-bridge series-resonant dc/dc converter. A high power factor at the input line is assured by operating the buck-boost converters in discontinuous conduction mode. With symmetrical operation and elaborately designed circuit parameters, zero-voltage-switching on all the active power switches of the converter can be retained to achieve high circuit efficiency. The operation modes, design equations and design steps for the circuit parameters are proposed. A prototype circuit designed for a 200 W dc output was built and tested to verify the analytical predictions. Satisfactory performances are obtained from the experimental results.