Multi-Scheme Evaluation of Disk Resonator Considering Transfer Performance and EME Indicator of WPT System

Wireless power transfer (WPT) technology has become a popular way to solve the battery charging problem of mobile devices. However, when designing a new WPT system, transfer power, power transfer efficiency (PTE), electromagnetic environment (EME) and other factors usually need to be considered. Firstly, for commonly used unshielded disk resonator, this paper establishes the theoretical analysis models of EME and transfer performance. Then, the multi-scheme evaluation method of disk resonators considering the WPT system transfer performance and the EME indicator is proposed. In addition, we also evaluate multi-resonator schemes made of the existing coil models in the laboratory using the above method. After considering the transfer power, PTE, coil overcurrent and EME, the optimal resonator scheme is obtained. Finally, the above evaluation method is verified by electromagnetic simulator COMSOL and experiment. The evaluation method proposed serves therefore for researchers and developers to significantly improve the design efficiency.