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 chargers. Traditional two-stage topology with an ac–dc power factor correction (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 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 article, 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.