Analysis and Control of Active Ripple Energy Storage for Single-Phase PFC Converters

Single-phase AC/DC converters typically require a bulky passive energy storage device to handle the double line frequency power ripple, affecting power density and lifetime. Among the active ripple energy storage solutions, the bidirectional buck topology is popular for its low component count and voltage stress, as well as good performance. Analysis and review of the existing control methods are initially described in this paper. Then, a new single-loop adaptive regulation method based on a resonant controller is proposed, able to achieve outstanding ripple voltage cancellation with reduced complexity. The performance of the proposed control has been fully simulated and experimentally validated on a 1 kW PFC prototype, based on a low-cost fixed-point microcontroller.