An Adaptive Impedance-Matching Network Based on a Novel Capacitor Matrix for Wireless Power Transfer
An Adaptive Impedance-Matching Network Based on a Novel Capacitor Matrix for Wireless Power Transfer
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DOI：
10.1109/tpel.2013.2292596
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发表时间：
2014-08-01
影响因子：
6.7
通讯作者：
Park, Jongsun
中科院分区：
文献类型：
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作者：
Lim, Yongseok;Tang, Hoyoung;Park, Jongsun
在通过磁谐振耦合的无线功率传输(WPT)系统中，最具挑战性的设计问题之一是即使发射器和接收器之间的距离改变，也要保持合理的功率传输效率(PTE)。当距离变化时，由于发射器的谐振器和接收器的谐振器之间的阻抗不匹配，PTE急剧减小。本文提出了一种新颖的串并联电容矩阵，该矩阵可以在不同距离的情况下自动重新配置阻抗以跟踪最佳阻抗匹配点。通过改变电容矩阵中串联和并联电容器的组合，实现了动态的WPT匹配系统。在所提出的电容矩阵中一个有趣的观察是，即使在电容矩阵调谐的情况下，谐振频率也没有移位。为了快速找到实现最大功率转移的最佳电容器组合，本文还提出了一种基于窗口预测的搜索算法。该系统的谐振频率为13.56 MHz，1W功率传输的实验结果表明，当传输距离从0变到1.2m时，传输效率最高可达88%。
In a wireless power transfer (WPT) system via the magnetic resonant coupling, one of the most challenging design issues is to maintain a reasonable level of power transfer efficiency (PTE), even when the distance between the transmitter and the receiver changes. When the distance varies, the PTE drastically decreases due to the impedance mismatch between the resonator of the transmitter and that of the receiver. This paper presents a novel serial/parallel capacitor matrix in the transmitter, where the impedance can be automatically reconfigured to track the optimum impedance-matching point in the case of varying distances. The dynamic WPT matching system is enabled by changing the combination of serial and parallel capacitors in the capacitor matrix. An interesting observation in the proposed capacitor matrix is that the resonant frequency is not shifted, even with capacitor-matrix tuning. In order to quickly find the best capacitor combination that achieves maximum power transfer, a window-prediction-based search algorithm is also presented in this paper. The proposed resonance WPT system is implemented using a resonant frequency of 13.56 MHz, and the experimental results with 1W power transfer show that the transfer efficiency increases up to 88% when the distance changes from 0 to 1.2 m.