A Soft-Switched Power-Factor-Corrected Single-Phase Bidirectional AC-DC Wireless-Power-Transfer Converter with An Integrated Power Stage

Bidirectional AC-DC wireless power transfer (WPT) converters are widely used in grid-connected electric vehicle (EV) systems for grid-to-vehicle (G2V) and vehicle-to-grid (V2G) applications. They usually apply a two-stage topology with a bidirectional AC-DC PFC converter and a bidirectional DC-DC WPT converter. Such a two-stage topology cannot achieve high efficiency and low cost. Recently, single-stage matrix bidirectional AC-DC WPT converters have been proposed. However, the matrix-converter-based topologies do not utilize remarkably lower count of power switches and generate large double line frequency ripple in the DC-side voltage or current. This paper proposes a new single-phase bidirectional AC-DC WPT topology with an integrated power stage to overcome the drawbacks of the matrix-converter-based topologies and retain the advantages of single-stage topologies. Description of the proposed topology with the modulation and control methods, theoretical analysis, and reference design procedure are presented in detail. Finally, a scaled-down laboratory prototype with 500-W output power is implemented with experimental results presented to validate the principle, analysis, and design.