Magnetic Analysis for Wireless Power Transfer via Magnetic Resonant Coupling – Effect of Foreign Object –

Takehiro Imura
Electrical Engineering & Information Systems, Graduate School of Engineering, APET, The University of Tokyo


It was thought that the magnetic resonant coupling is completely new technology of wireless power transfer which can achieve high efficiency and high power at a large air gap. However, it has been revealed in recent research that the technology can be categorized in one of electromagnetic induction with limited circuit topology. In that time, the equivalent circuit model plays an important role. On the other hand, in practical use, the metal foreign matter problem is very important. Therefore, we will describe the handling in the equivalent circuit model when there is a metal foreign object. In addition, limitations that can be modeled by an equivalent circuit model and range that can be modeled by magnetic field analysis are described. In addition, we will explain the influence of metal foreign object size and material.

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