Maximizing Air Gap and Efficiency of Magnetic Resonant Coupling for Wireless Power Transfer Using Equivalent Circuit and Neumann Formula
Maximizing Air Gap and Efficiency of Magnetic Resonant Coupling for Wireless Power Transfer Using Equivalent Circuit and Neumann Formula
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DOI：
10.1109/tie.2011.2112317
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发表时间：
2011-10-01
影响因子：
7.7
通讯作者：
Hori, Yoichi
中科院分区：
文献类型：
--
作者：
Imura, Takehiro;Hori, Yoichi
近年来，无线电力传输领域取得了令人瞩目的进展。随着最近的研究，通过大的气隙传输功率已经实现。已经提出了小型和大型电力设备，例如，小型设备（移动电话和笔记本电脑）和大型设备（电动车辆）的无线电力传输。此外，还提出了用无线电力传输取代每根电线的方案。耦合模理论于2006年提出，并于2007年得到验证。磁谐振和电谐振耦合允许功率以高效率穿过大的气隙。该技术与电磁感应密切相关，已应用于通信技术中用作滤波器的天线和谐振器。我们使用等效电路研究了这些现象和技术，这是电气工程师比耦合模式理论更熟悉的格式。在本文中，我们使用等效电路分析了最大效率气隙与诺伊曼公式之间的关系，并提出了给定气隙达到最大效率所需条件的方程。计算结果与电磁场分析和实验结果吻合较好。
The progress in the field of wireless power transfer in the last few years is remarkable. With recent research, transferring power across large air gaps has been achieved. Both small and large electric equipment have been proposed, e. g., wireless power transfer for small equipment (mobile phones and laptops) and for large equipment (electric vehicles). Furthermore, replacing every cord with wireless power transfer is proposed. The coupled mode theory was proposed in 2006 and proven in 2007. Magnetic and electric resonant couplings allow power to traverse large air gaps with high efficiency. This technology is closely related to electromagnetic induction and has been applied to antennas and resonators used for filters in communication technology. We have studied these phenomena and technologies using equivalent circuits, which is a more familiar format for electrical engineers than the coupled mode theory. In this paper, we analyzed the relationship between maximum efficiency air gap using equivalent circuits and the Neumann formula and proposed equations for the conditions required to achieve maximum efficiency for a given air gap. The results of these equations match well with the results of electromagnetic field analysis and experiments.