Relation analysis between feeding structures and effect of shield for coils in wireless power transfer with magnetically coupled resonance

摘要

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 [1]–[2]. 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 [3]. Therefore, for the practical use, decreasing the leaked electromagnetic field is inevitable.