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Improving the efficiency of magnetic coupling energy transfer byetching fractal patterns in the shielding metals

查看全文 作　　者：Qing-feng [1]LI;Shao-bo [1,2]CHE;Wei-ming [1,2]WANG;Hong-wei [1,2]HAO;Lu-ming [1,2,3]LI 高影响力作者 机构地区：[1]School of Aerospace, Tsinghua University, Beijing 100084, China;[2]National Engineering Laboratory for Neuromodulation, Beijing 100084, China;[3]Center of Epilepsy, Beijing Institute for Brain Disorders, Beijing 100084, China高影响力机构 出　　处：《Frontiers of Information Technology & Electronic Engineering》索引2016年第17卷第1期,共9页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China(No.51125028);the National Key Technology R&D Program of China(No.2011BAI12B07) 摘　　要：Thin metal sheets are often located in the coupling paths of magnetic coupling energy transfer(MCET) systems. Eddy currents in the metals reduce the energy transfer efficiency and can even present safety risks. This paper describes the use of etched fractal patterns in the metals to suppress the eddy currents and improve the efficiency. Simulation and experimental results show that this approach is very effective. The fractal patterns should satisfy three features, namely, breaking the metal edge, etching in the high-intensity magnetic field region, and etching through the metal in the thickness direction. Different fractal patterns lead to different results. By altering the eddy current distribution, the fractal pattern slots reduce the eddy current losses when the metals show resistance effects and suppress the induced magnetic field in the metals when the metals show inductance effects. Fractal pattern slots in multilayer high conductivity metals(e.g., Cu) reduce the induced magnetic field intensity significantly. Furthermore, transfer power, transfer efficiency, receiving efficiency, and eddy current losses all increase with the increase of the number of etched layers. These results can benefit MCET by efficient energy transfer and safe use in metal shielded equipment. 关 键 词：FRACTAL pattern,Metal-layer-shield,Eddy current,Magnetic coupling energy transfer
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