An Overview of Innovations in Magnetic Coupler Design for Electric Vehicle Wireless Charging Systems

Wireless power transfer (WPT) technology is recognized as an essential advancement in the electric vehicle (EV) industry, offering enhanced user convenience and increased charging performance. Central to this technology is the magnetic coupler design, which is critical for the transferability, scalability, and overall viability of WPT systems. In this paper, an overview is provided of the current coil designs utilized in EV wireless charging, with a focus on how system performance is influenced by coil parameters. Various coil configurations, including circular, solenoid, and planar types, are listed and discussed. Innovations in coil design that address challenges such as misalignment, and cost reduction are also highlighted. Different directions for coil development are explored, emphasizing emerging materials and technologies that hold promise for optimizing wireless charging for EVs.