A study of efficiency improvement of wireless power transfer by impedance matching

2012 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications Pub Date : 2012-05-10 DOI:10.1109/IMWS.2012.6215774

K. Ogawa, N. Oodachi, S. Obayashi, H. Shoki

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引用次数: 23

Abstract

In wireless electric power transmission employing magnetic resonant coils, objects or debris in the vicinity of the coil cause impedance mismatching. The mismatching will decrease the transmission efficiency at the frequency for performing electric power transmission. We have investigated the efficiency improvement by impedance matching adjustment using variable lumped capacitors. In the present work, a loop is employed to excite the resonance coil, and a set of variable capacitors are added to the loop on the power transmission side to adjust the matching. For the test against a small object, a small aluminum plate was put close to the transmission coil, and the input impedance of the coil on the transmission side was adjusted by the variable capacitors. The test measurement showed that the adjustment of the input impedance substantially improved the efficiency at the power transfer frequency.

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利用阻抗匹配提高无线电力传输效率的研究

在采用磁谐振线圈的无线电力传输中，线圈附近的物体或碎片会导致阻抗不匹配。在进行电力传输的频率上，不匹配会降低传输效率。研究了采用可变集总电容器进行阻抗匹配调整对效率的提高。在本工作中，采用环路激励谐振线圈，并在传输侧环路上增加一组可变电容器来调节匹配。对于小物体的测试，在传输线圈附近放置一个小铝板，并通过可变电容器调节传输侧线圈的输入阻抗。测试结果表明，输入阻抗的调整大大提高了功率传输频率的效率。

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2012 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications

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