A Study on Transmission Coil Parameters for Wireless Power Transfer in Electric Vehicles

Abstract

As electric vehicles are on the rise due to the growing concerns over global issues such as fossil fuel depletion, global warming leading to severe climate changes. The infrastructure of wired charging requires building one charging station for each EV would be inefficient usage of materials to build large quantities of charging stations. Hence, wireless power transfer through magnetic coupling is a promising technology for the future of charging EVs since it is small, compact and can be built underground. One of the downsides of wireless power transfer is efficiency decrease rapidly at increasing air gaps and extremely sensitive to other electrical parameters such as receiver unit capacitance. The purpose of this journal paper is to investigate the coil parameter, more specifically the outer diameter of wireless power transfer coil effect on the wireless power transfer efficiency at greater air gaps and different receiver capacitance for electric vehicle applications. Simulation results show that the power transfer efficiency of greater outer diameter coil performs better at greater air gaps and with a more stable range.