無線充電之感應線圈耦合與電路分析

近年來可攜式電子產品之普及化，使相應充電裝置之安全性與便利性逐漸成為消費者購買的考量因素之一。傳統的有線充電裝置除纜線影響美觀、使用上便利性較低外，尚有電線走火、觸電等安全問題。有鑑於此，無線充電裝置之發展帶來了嶄新的開端，減少了纜線之束縛，將可攜式電子產品放置於充電平台上即可安全且方便地充電是其主要特色，然而由於少了纜線作為輸電媒介，電力傳輸效率是一大關鍵問題。因此，本論文係對無線充電裝置之感應電路進行分析研究，以無線充電聯盟規範之電路為基準，分析各級電路之有效功率傳送效率，並使用電磁模擬軟體Maxwell 3D對電力傳輸之關鍵──感應線圈模擬其耦合係數。電路部分以傳送及接收電路為主，在頻域上分析諧振電路在前後級阻抗間之電力傳送效率。模擬部分主要在於研究兩種結構──立體纏繞式和平面纏繞式線圈對耦合效能之影響，並加入磁性屏蔽層模擬耦合係數之改善效率。最後實際繞製兩種結構感應線圈驗證模擬所得到之結果並計算簡化電路之傳輸效率。

關鍵字

無線電力傳輸；電磁感應；諧振電路；耦合係數；無線充電聯盟； Maxwell 3D

並列摘要

Safety and convenience become one of the considering factors of consumption with the prevalence of portable electrical products nowadays. Besides disorderliness and inconvenience, traditional recharging devices with cables still have many problems such as electrocution, fire caused by electricity, etc. In order to solve these problems, development of wireless recharging technology brings in a brand new design concept. We can recharge portable electrical devices safely and conveniently by just putting them on the recharging platform. However, the main difficulty is the low efficiency of electric power transfer without cables as transferring media. Therefore, in the thesis, we analyze the inductive circuits of wireless recharging device proposed by Wireless Power Consortium, and derive the efficiency of effective power transfer between each circuit layer and use electromagnetic simulation software—Maxwell 3D—to simulate coupling coefficients of two inductive coils, which are key points of electric power transfer. The part of circuit analysis is about transmitting and receiving circuit, we analyze the power transfer efficiency of two resonant circuits which have complex impedances in the frequency domain. Then we simulate two coil structures—vertical helix coils and horizontal helix coils, incorporated with additionally auxiliary magnetic shieldings to improve coupling coefficients, to compare effects of electromagnetic coupling analyzed by Maxwell 3D software. Finally, we wind two structures made by coils mentioned above to measure the coupling coefficients and calculate the power transfer efficiency of simplified inductive circuit for coils with magnetic shieldings.

並列關鍵字

wireless power transfer ； electromagnetic induction ； resonant circuit ； coupling coefficient ； Wireless Power Consortium ； Maxwell 3D

參考文獻

[41] Arthur R. Bergen and Vijay Vittal, ‘‘Power Systems Analysis’’, 2nd Edition, Prentice Hall.

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[2] S. Sheik Mohammed, K. Ramasamy, T. Shanmuganantham, ‘‘Wireless Power Transmission—A Next Generation Power Transmission System’’, 2010 International Journal of Computer Applications, vol.1, no.13, 2010.

[3] Chunlai Yu, Rengui Lu, Yinhua Mao, Litao Ren, and Chunbo Zhu, ‘‘Research on the Model of Magnetic-Resonance Based Wireless Energy Transfer System’’, IEEE Vehicle Power and Propulsion Conference (VPPC), pp.414-418, Sep. 2009.

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無線充電之感應線圈耦合與電路分析

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