Method for Reducing Capacitor Size of PFC Converter.

In a conventional two-stage PFC converter cascaded from the Boost and DC/DC converters, the output of the Boost circuit needs high voltage level electrolytic capacitor to storage energy, which has a large volume, short lifetime and high price. A Boost/half-bridge combined soft-switching resonant PFC converter is studied. It uses the low voltage electrolytic capacitor in the output of the half-bridge circuit to balance the instantaneous power, and greatly reduces the capacitor of a PFC converter. The Boost circuit output capacitor is resonant with the leakage inductance of the transformer. The control logic using a common circuit to control the two-stage converter is discussed. Good performance of the converter with small capacitance in the output of the Boost converter improves the feasibility of the reduction in capacitance. The capacitor design methods are given. The experimental results verify the theoretical analysis. [ABSTRACT FROM AUTHOR]