Single-Phase Boost Type Power Factor Corrector with Embedded Active Buffer Achieving Power Decoupling

In this paper, a boost type Power Factor Corrector is proposed to deal with the inherent issue of double line frequency power ripple, namely power coupling, in single-phase AC/DC conversion systems. The proposed converter is embedded with an active buffer circuit and the redundant capacitor and power switches enable active power decoupling and an all-film-capacitor implementation. The active power decoupling control scheme in this paper is based on the direct control of ac power and dc power and is therefore relatively easy to implement. The former one helps to achieve unit power factor at ac side while the latter one helps to regulate dc side output voltage and as a result the double line frequency power ripple could be automatically transferred onto the buffer capacitor of the converter. Theoretical analysis, simulation and experiment results are provided in the paper.