Overview of Foreign Object Detection inWireless Power Transfer System
Zhang Xian1, Xing Ziyao1, Xue Ming1, Yang Qingxin1, Sun Yu2
1. Tianjin Key Laboratory of Advanced Electrical Engineering and Energy Technology Tiangong University Tianjin 300387 China; 2. China Electrotechnical Society Beijing 100055 China
Abstract：As wireless power transfer technology has developed rapidly in recent years, the requirements of security have become higher and higher in the course of using. Because of the coupling air gap in its structure, foreign objects will inevitably enter into the system during work. The intervention of metal objects and living objects makes the system deviate from the normal operating point and even lead to safety accidents. Therefore, foreign object detection (FOD) technology has been extensively concerned. The relevant standards of FOD technology in wireless power transfer system at home and abroad were systematically discussed, and the issues existing in the current standards were further pointed out. In addition, the new FOD technology was divided into three parts, auxiliary coil FOD technology, system parameter FOD technology and sensor FOD technology. For each type of technology, the basic principle, technical problems and detection categories were respectively analyzed, and the characteristics of these three types of technologies were compared. Hot issues for FOD technology in wireless power transfer system were further pointed out in the end, aiming to provide directions for the future research of FOD in wireless power transfer system.
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