Study on Effective Loading Method of High-permeability Magnetic Sheet for Wireless Power Transmission Coil

Abstract

Recently, Wireless Power Transmission (WPT) system in accordance with Qi standards is being installed into smartphones. However, the transmission efficiency greatly deteriorates due to adjacent metal objects such as battery cases. To solve this problem, it is thought that the high permeability magnetic sheet insertion method into the gap between WPT-coil and metal objects is effective. In order to make the thickness of these materials thinner and improve the efficiency, the effective loading method using an amorphous magnetic sheet is proposed in this report.