Simulation Research on the Three-Coil Wireless Power Transfer System Based on High Temperature Superconducting Relay Coil

High temperature superconductors have excellent properties such as low loss and high current density at low temperatures, and have good application prospects in power, transportation, energy, and military. Experimental studies have found that their introduction into wireless power transfer (WPT) systems can significantly improve the transmission distance and efficiency of systems. To further improve the transmission performance of the system, a three-coil wireless power transfer system based on superconducting relay coils is constructed in this paper. Through theoretical analysis and simulation modeling, the transmission performance of the system using relay coils of different materials is compared at different transmission distances, relay coil positions, and loads. The results demonstrate that the high temperature superconducting relay coil can improve the overall performance of the WPT system. The system can place complex equipment such as the transmitter power supply, inverter, and the control system of the WPT system in a separate area, which makes the wireless charging area structure simple and increases the range of the wireless charging area. It provides new ideas for the design of wireless charging areas in public places, wireless charging furniture, and wireless charging of electric vehicles.