Improving the Transmission Efficiency of Copper Plate Coils for Wireless Power Transmission Using Magnetic Flux Path Control Technology

Litz copper wires are generally used for wireless power transmission coils in electric vehicles, to reduce high-frequency losses. The production of Litz wire, however, is prohibitively expensive for many. Herein, a novel type of copper plate coil is proposed, which can be manufactured at a low cost. To overcome the issues of high copper loss and low transmission efficiency, a magnetic flux path control technique is also proposed. Experimental validation confirms that using this novel technology for copper sheet coils improves their power transfer efficiency by 5.8%.