Bridgeless power factor correction circuits with voltage-doubler configuration

This paper presents a generalized approach to deriving single-phase power factor correction (PFC) circuits with bridgeless and voltage-doubler structures. The approach requires two dc/dc converters connected in a parallel-input series-output manner. Compared to conventional full-bridge diode rectified PFC circuit, which has two diodes along the input current path, the PFC circuits derived by this approach have one diode only, hence reducing the converter losses. Through the proposed approach, some recently reported bridgeless PFC circuits have been identified and new possible combinations can be generated. A design example of dual buck dc/dc converters operating in discontinuous-input-voltage mode (DIVM) is presented to demonstrate the usefulness of the proposed approach.