Summary
International Symposium on Antennas and Propagation
2012
Session Number:POS2
Session:
Number:POS2-45
Relation Analysis between Feeding Structures and Effect of Shield for Coils in Wireless Power Transfer with Magnetically Coupled Resonance
Junya Kaneda, Keishi Miwa, Nobuyoshi Kikuma, Hiroshi Hirayama, Kunio Sakakibara,
pp.-
Publication Date:2012/10/29
Online ISSN:2188-5079
Summary:
Recently, the technology of supplying the electric power by the wireless attracts our attention for use in household electric appliances and electric vehicles. Particularly, the research of wireless power transfer with magnetically coupled resonance proposed by MIT is actively pursued. This is because it satisfies the demand of long distance transmission, high robustness against misalignment between transmitting and receiving equipments, and low unwanted radiation. However, the influence on human bodies and other electric devices is felt uneasy because this technology has the problem of leaked electromagnetic field generated by transmitting and receiving equipments. Therefore, for the practical use, decreasing the leaked electromagnetic field is inevitable. In this paper, we examine basically the difference between direct feeding and indirect feeding (electromagnetic induction feeding) in the effect of shield for decreasing leaked electromagnetic field. As the evaluation measures, transmitting efficiency and leaked magnetic field are used in the computer simulation. As a result of the computer simulation, it is confirmed that the shields can suppress leaked magnetic field enough for both feeding structures. Particularly, it is observed that direct feeding can reduce a little more the leaked magnetic field than indirect feeding. On the other hand, it is found that indirect feeding is less susceptible by the shields than direct feeding in transmitting efficiency. For the future works, it is considered that analysis results in this paper are verified by experiments using actual equipments.