A Study on Safety Issues of Hybrid Wireless Power Transfer in Laboratory

Hybrid wireless power transfer (HPT) employs both magnetic and electric fields to transmit the power across air-gap distance at the resonant frequency, enhancing the potential for charging battery in electric vehicles. While the HPT technology is still under research study, the safety concerns for HPT have not yet been reported during the experiment. This study aims to re-investigate the safety issues of HPT in experiment by creating and testing the HPT prototype. The HPT proposed by Luo is used in our study, consisting of two coupling coils, four aluminium plates, and two compensation capacitors. This HPT prototype is tested in the frequency range of 600 to 700 kHz. To reveal the effects of thermal and EMF leakages, a thermal scan and EMF detector are used in the experiment. The results demonstrated that the prototype of HPT operates at high frequency, high power, and high efficiency. Moreover, the safety issues in experiment are summarized.