New characteristics analysis considering transmission distance and load variation in wireless power transfer via magnetic resonant coupling
New characteristics analysis considering transmission distance and load variation in wireless power transfer via magnetic resonant coupling
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DOI：
10.1109/intlec.2012.6374474
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发表时间：
2012-12
期刊：
影响因子：
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通讯作者：
M. Kato;T. Imura;Y. Hori
中科院分区：
文献类型：
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作者：
M. Kato;T. Imura;Y. Hori
基于磁谐振耦合的无线电力传输（WPT）在各种应用中受到了广泛的关注。传统上，假设负荷是恒定的，只研究传递效率。在实际的WPT应用中，负载和传输距离变化频繁。此外，还需要输入电压与输出电压之比、输入电流与输出电流之比、输入阻抗等信息来理解和构建电力传输系统。本文不仅对传递效率进行了研究，还对上述三个参数进行了研究。然后利用实际天线的参数对这些参数进行了负载变化和传输距离变化条件下的分析。从分析结果来看，存在最大效率的负载电阻值。其次，对小型互感机壳，通过改变负载电阻来提高效率效果更大。最佳负载电阻也会随着传输距离的变化而变化，并且所消耗的功率峰值可能不对应于最高效率。最后，故障保护也可能是必要的情况下，当负载电阻是非常高的，当接收天线不存在造成高电源电流。
Wireless power transfer (WPT) via magnetic resonant coupling has been attracting research attention for various applications. Conventionally, load is assumed to be constant and only transfer efficiency is studied. In actual WPT applications, the load and transfer distance change frequently. Furthermore, information such as ratio of input voltage to output voltage, ratio of input current to output current, and input impedance are needed for understanding and constructing the power transfer system. In this paper, not only the transfer efficiency but also the three parameters mentioned are studied. These parameters are then analyzed for changing load and changing transfer distance conditions using actual antennas' parameters. From the analysis results, the load resistance value for maximum efficiency exists. Secondly, improving efficiency by changing load resistance for small mutual inductance case has larger effect. The optimum load resistance also changes according to transmission distance and also the consumed power peak may not correspond to maximum efficiency. Finally, fault protection may also be necessary for the cases when the load resistance is extremely high and when the receiver antenna is not present causing high supply current.