Abstract:
Traditional two-level converters have high switching frequencies, low efficiency, and large power device losses. The AC-side filter inductor also has a large volume, making it difficult to increase power density. To address these issues, starting from the Pseudo Totem-pole power factor correction (PTP-PFC) circuit, diode-clamped bridges are implemented through cascading, level equivalence, mirroring, and redundancy removal. The arm structure is derived, and a family of three-level PTP-PFC circuits is proposed. First, the operating principles of the proposed family of new single-phase three-level PTP-PFC converters are analyzed, and a modulation method suitable for this topology is proposed. Second, the number of power devices, voltage and current stress, loss and other factors of the proposed topology are analyzed and compared, and the advantages of each circuit are summarized. Finally, three experimental prototypes AC input 220V/50Hz, output 400V, power 1kW representative three-level PTP-PFC are designed. The experimental results verify the theoretical analysis and topological derivation of the proposed three-level PTP-PFC circuit.