An Adjustable Coupling Method for Planar Wireless Power Transfer System

Abstract

In this paper, an adjustable coupling method is proposed to improve the transfer efficiency of magnetically coupled resonant wireless power transfer system (MCR-WPT) under various transfer distances. By changing the offset distance between the driving loop and the transmitter coil, the coupling coefficient was adjusted to make the MCR-WPT have a better transfer efficiency at various transfer distances. The efficiency of simulation is 41.1% higher than the original MCR-WPT and the experimental results are basically consistent with the simulation.