Analysis-based Design of Class-E<sup>2</sup> Wireless Power Transfer System with Parasitic Components of Switching Devices at Any Duty Ratio

We present an analysis-based design method for the class-E2 wireless power transfer (WPT) system, which accounts for the parasitic components of switching devices, such as the on-resistances of MOSFETs and diodes, as well as the forward voltage drops of diodes, across any duty ratio. A prototype is designed and tested to validate the proposed method. The simulated and experimental results demonstrate good agreement with analytical predictions. Moreover, all switch voltage waveforms satisfy the class-E zero-voltage-switching/zero-derivative-switching (ZVS/ZDS) conditions, highlighting the impact of parasitic components in switching devices and confirming the effectiveness of the proposed design method.