Analysis and Design of A High-Efficiency 6.78-MHz Wireless Power Transfer System with Scalable Number of Receivers

For multiple-receiver wireless power transfer (WPT), a scalable solution is desired that functions with changing number of receivers. Meanwhile, challenges lie in differences in load characteristics, power level, and cross coupling between the receivers. This article employs Class E$\bf ^2$ dc–dc converter topology for the multiple-receiver WPT systems working at megahertz (MHz). The shunt capacit...