A Single-Stage Bridgeless Buck-Boost PFC Converter with Two-Terminal Outputs

This paper proposes a single-stage bridgeless buck-boost power factor correction (SSBLBB-PFC) converter with two-terminal outputs. By adopting a minimized loop inductance design and using only one high-frequency switching device in both the boost and buck modes, the circuit loss has been significantly reduced. Additionally, the twoterminal output structure is more versatile than the conventional three-terminal output structure, and it can also reduce voltage stress. Additionally, the single inductor is reused to achieve power conversion in the positive and negative input voltage, achieving 100% utilization of the DC inductor. The dead beat control (DBC) is used to control the inductor current to achieve PFC. A detailed analysis was conducted on the working modes and control strategies of the converter. The simulation results under the 220 V power grid prove that the proposed inverter has a better dynamic performance.