Journal of Magnetics

The Korean Magnetics Society (한국자기학회)
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Characteristics of Shield Materials for Wireless Power Transfer

  • Chu, In Chang (Global EMI/EMC Team, 3M Korea Innovation Center) ;
  • Jeong, Jinseong (School of Electrical and Computer Engineering, University of Seoul)
  • Received : 2014.03.23
  • Accepted : 2014.06.12
  • Published : 2014.09.30
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Abstract

In this paper, we examine the electrical and magnetic properties of three different types of shield materials used for wireless power transfer systems: namely, FeSiAl-composite, NiZn-ferrite, and FeSi-amorphous types. The power transfer efficiency and resistance of an RX coil are measured, while varying the shield thickness. For all three types, a thicker shield provides better power transfer efficiency. Analysis of the measurements shows that the FeSiAl-composite type is suitable for systems with size limitation. In terms of magnetic properties, the FeSi-amorphous type shows the best features, and is suited to high power applications. This work can be used as a guideline to select suitable shielding material in various wireless power transfer systems.

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