Single-Phase AC-DC Buck PFC Converter Based on Flying-Capacitor Topology with Active Power Decoupling Control

In this paper, a single-phase AC-DC buck PFC converter with active power decoupling control is proposed to deal with the double line frequency power ripple issue in ACDC systems. The converter is based on flying-capacitor topology and thus provides additional degree of control freedom and power buffering component. The active power decoupling control scheme in this paper involves direct control of ac side power to realize unity power factor and direct control of dc side power to regulate dc output voltage. By taking advantage of energy conservation principle, the double line frequency power ripple can be spontaneously transferred onto the buffering capacitor and thus the complicated ripple power control could be avoided. Theoretical analysis and simulation results will be provided in the following sections.