An Efficient and Simple Battery Wireless Charging System with Re-configurable Rectifier

Wireless charging technology (WCT) is mostly used in the domain of power battery packs. The battery wireless charging system (BWCS) should provide the required constant outputs for the power battery packs. The existing charging conversion methods have the defects of more components, low transfer efficiency and poor reliability. To solve above issues, this paper proposes an efficient and simple BWCS with re-configurable rectifier. The BWCS can implement smooth switching between series-series (SS) circuit with natural load-independent CCO and series/inductor-capacitor-capacitor (S/LCC) circuit with load-independent CVO by controlling the MOSFETs in the rectifier. The BWCS works at a fixed frequency with a few components, eliminating the wireless link between the two sides, and simple control method. The operating principle of the presented BWCS is described in detail, and a 250V/4A experimental platform is set up to validate the good performance of the presented BWCS.