Automated Impedance Matching System for Robust Wireless Power Transfer via Magnetic Resonance Coupling
Automated Impedance Matching System for Robust Wireless Power Transfer via Magnetic Resonance Coupling
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DOI：
10.1109/tie.2012.2206337
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发表时间：
2013-09-01
影响因子：
7.7
通讯作者：
Hori, Yoichi
中科院分区：
文献类型：
--
作者：
Beh, Teck Chuan;Kato, Masaki;Hori, Yoichi
最近，已经提出了使用电磁谐振耦合的高效中程无线传输技术，并且由于其实用范围和效率而受到了广泛关注。谐振器的谐振频率随着谐振器之间的差距的变化而变化。然而，当该技术应用于兆赫范围时，可用频率受到工业、科学和医疗（ISM）频带的限制。因此，为了实现最大功率传输效率，谐振频率必须固定在ISM频带内。在本文中，提出了一种自动阻抗匹配（IM）系统，通过匹配谐振器对的谐振频率的电源，以提高效率。仿真和实验验证了IM电路可以改变谐振频率为13.56 MHz（在ISM频段）为不同的空气间隙，提高功率传输效率。实验还证明，自动IM可以很容易地实现只需观察和最小化的反射波在系统的发射侧。
Recently, a highly efficient midrange wireless transfer technology using electromagnetic resonance coupling has been proposed and has received much attention due to its practical range and efficiency. The resonance frequency of the resonators changes as the gap between the resonators changes. However, when this technology is applied in the megahertz range, the usable frequency is bounded by the industrial, scientific, and medical (ISM) band. Therefore, to achieve maximum power transmission efficiency, the resonance frequency has to be fixed within the ISM band. In this paper, an automated impedance matching (IM) system is proposed to increase the efficiency by matching the resonance frequency of the resonator pair to that of the power source. The simulations and experiments verify that the IM circuits can change the resonance frequency to 13.56 MHz (in the ISM band) for different air gaps, improving the power transfer efficiency. Experiments also verified that automated IM can be easily achieved just by observing and minimizing the reflected wave at the transmitting side of the system.