A Compact Single-Phase AC-DC Wireless-Power-Transfer Converter with Active Power Factor Correction

Single-phase AC-DC wireless power transfer (WPT) converters are widely used in grid-connected systems, such as wireless electric vehicle (EV) chargers. Traditional two-stage topology with an AC-DC PFC rectifier stage and a DC-DC WPT converter stage cannot achieve the highest overall efficiency and the lowest production cost. Moreover, two separate controllers are required. Recently, a single-phase single-stage AC-DC WPT converter with a front-end boost bridgeless power factor correction (PFC) rectifier was proposed to overcome the drawbacks of two-stage topologies. However, two front-end diodes are still required for rectification and the input power quality is not sufficiently high as the input current is not actively shaped. In this paper, a compact single-phase integrated-power-stage AC-DC WPT converter with only four active power switches and four diodes is proposed. The full-bridge switches are utilized to perform AC-DC PFC rectification and DC-DC WPT conversion simultaneously. Description of the proposed topology with the modulation and control methods, operation principle, power loss analysis, and referenced design procedure are presented in detail. Finally, a 500-W laboratory prototype is implemented, and the corresponding experimental results are given to validate the principle, analysis, and design.