Analysis of Modified Single-Phase PFC AC-DC Buck-Boost Converter

This paper researches a modified single-phase power-factor-correction (PFC) AC-DC buck-boost converter, which is operated in discontinuous conduction mode (DCM) by using a simple control scheme to achieve almost unity power factor, low total harmonic distortion of input current (THDi), and step-up/down DC output voltage for universal input voltage applications. This converter has low voltage stresses on the power devices than the conventional PFC AC-DC buck-boost converter. The steady-state analysis of voltage gain and boundary operating condition are discussed in detailed. Finally, the simulation results are shown to verify the performance of this modified buck-boost converter.