A review of the impacts of coil design on system efficiency of wireless power transmission

Wireless power transmission (WPT) technology is currently the cutting-edge technology in the field of power transmission, and the design of high quality factor coil is one of the key technologies of wireless power transmission. This paper firstly introduces several common wireless power transmission technologies, mainly focusing on the review of transmission methods, applying scope, basic principle and research methods of the magnetic coupling WPT system. Then, the optimized design of the coil in magnetic coupling WPT is elaborated, mainly in the following parts, the first part is the design of the coil's parameters, including the shape, structure, number of turns, the pitch of the coil turns, winding method, material selection, etc., the second part is the design of resonant link structure, such as the selection of 2 coils or 4 coils, the introduction of the intermediate coil, the use of ferrite, and the study of multi-transmitter coil and multi-receiver coil system. Finally, the experimental results are cited for the analysis and comparison of different kinds of coil designs. ©, 2015, The editorial office of Transaction of China Electrotechnical Society. All right reserved.