Similar articles

Abstract: 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.

The paper investigated fractal patterns for eddy current suppression and efficiency improvement. Both of simulations and experiments are detailing presented. It is a high quality paper overall.

基于分形图案蚀刻屏蔽金属提高磁耦合能量传输效率

[1]Albesa, J., Gasulla, M., 2012. Inductive power transfer for autonomous sensors in presence of metallic structures. IEEE Int. Instrumentation and Measurement Technology Conf., p.664-669.

[2]Geselowtiz, D.B., Hoang, Q.T.N., Gaumond, R.P., 1992. The effects of metals on a transcutaneous energy transmission system. IEEE Trans. Biomed. Eng., 39(9):928-934.

[3]Ho, J.S., Yeh, A.J., Neofytou, E., et al., 2014. Wireless power transfer to deep-tissue microimplants. PNAS, 111(22):7974-7979.

[4]Kufa, M., Raida, Z., 2013. Lowpass filter with reduced fractal defected ground structure. Electron. Lett., 49(3):199-201.

[5]Kurs, A., Karalis, A., Moffatt, R., et al., 2007. Wireless power transfer via strongly coupled magnetic resonances. Science, 317(5834):83-86.

[6]Lovik, R.D., Abraham, J.P., Sparrow, E.M., 2011. Surrogate human tissue temperatures resulting from misalignment of antenna and implant during recharging of a neuromodulation device. Neuromodulation, 14(6):501-511.

[7]Rani, S., Singh, A.P., 2013. Modified Koch fractal antenna with asymmetrical ground plane for multi and UWB applications. Int. J. Appl. Electrom., 42(2):259-267.

[8]Siakavellas, N.J., 1997. Two simple models for analytical calculation of eddy currents in thin conducting plates. IEEE Trans. Magn., 33(3):2245-2257.

[9]Ye, D.D., Yan, G.Z., Wang, K.D., et al., 2008. Development of a non-cable whole tectorial membrane micro-robot for an endoscope. J. Zhejiang Univ.-Sci. A, 9(8):1141-1149.

[10]Yu, X., Skauli, T., Skauli, B., et al., 2013. Wireless power transfer in the presence of metallic plates: experimental results. AIP Adv., 3(6):062102.

[11]Zangl, H., Fuchs, A., Bretterklieber, T., et al., 2010. Wireless communication and power supply strategy for sensor applications within closed metal walls. IEEE Trans. Instrum. Meas., 59(6):1686-1692.