Single-stage single-switch power factor correction converter based on discontinuous capacitor voltage mode buck and flyback converters

A new single-switch, single-stage power factor correction (PFC) converter based on discontinuous capacitor voltage mode (DCVM) is presented in this study. The conventional single-stage PFC converters have high voltage across their bulk capacitor which imposes high voltage stress on the switch and also the bulk capacitor voltage stress increases at light load condition. The most important advantage of the proposed topology is that the voltage across the bulk capacitor is low and the input current is continuous. Furthermore, this topology does not have high voltage stress across the bulk capacitor at light loads. The proposed topology is derived from a DCVM buck converter integrated with a flyback converter. The proposed PFC topology contains low number of passive components and employs only one switch, resulting in reduced complexity and cost. The presented simulation and experimental results of the proposed converter justify the theoretical analysis.