Wireless Power Transfer (WPT) Fundamentals with Resonant Frequency-Dependent Parameters, Energy Transfer Efficiency, and Green Technology Applications

This paper presents the fundamentals of Wireless Power Transfer, its limitations, applications, and variables that affect energy transfer efficiency. Wireless power transfer with resonant frequency over variable distances require adaptation of frequency to optimize the energy transfer efficiency. Adaptive high-frequency changes cause variations in the transmitter and receiver coils parameters. The skin-effect resistance and inductance of the receiver and transmitter coils affect their quality factors and the overall energy transfer efficiency. In this paper, the effect of high frequency on the parameter's variation of the transmitter and receiver coils quality factor and power transfer efficiency is derived, analyzed, and evaluated. Finally, an experimental WPT circuit is designed for mid-range power transfer and implemented in the laboratory. The overall performance and efficiency of the WPT circuit as a function of frequencies and distances are discussed and demonstrated in the lab. The applications of WPT to Electric Vehicle Charging, Smart Grid, and wireless charging of portable bio-medical electronic devices such as pace maker were discussed.