Series–series wireless power transfer (WPT) con- verters are used in a wide range of applications, such as electric vehicle chargers. Conventional WPT converters often suffer from low efficiency due to their multi-stage topology. A single-stage, power-factor-corrected WPT converter is proposed to combine the two stages and improve efficiency, while reducing the size, number of semiconductor components, and total har- monic distortion (THD). Unlike the conventional approach, which uses two separate controllers to regulate the input and output characteristics, the proposed topology uses a hybrid controller to regulate the dc-link voltage as well as the output dc current and voltage. A variable duty-cycle controller shapes the input current in continuous conduction mode (CCM), and the output dc current is maintained by variable switching-frequency control without an output LC filter. This controller provides variable gain by changing the duty ratio and switching frequency to keep a constant current (CC) for the load. This approach reduces control complexity and avoids adding a current controller on the load side.
