Basic study on reduction of reflected power using DC/DC converters in wireless power transfer system via magnetic resonant coupling
Basic study on reduction of reflected power using DC/DC converters in wireless power transfer system via magnetic resonant coupling
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DOI：
10.1109/intlec.2011.6099737
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发表时间：
2011-12
期刊：
影响因子：
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通讯作者：
Yu Moriwaki;T. Imura;Y. Hori
中科院分区：
文献类型：
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作者：
Yu Moriwaki;T. Imura;Y. Hori
目前，利用磁共振耦合进行无线电力传输的研究和发展十分活跃。与传统方法相比，该方法可以在大气隙中实现高效的功率传输，并且对位移具有鲁棒性。实现该系统的问题之一是由于负载变化和位移引起反射功率的增加。反射功率会在电源中损耗，导致功率传输效率下降。因此，阻抗匹配电路成为实现高效无线电源系统的关键。本文提出了一种利用DC/DC变换器降低反射功率的新方法。DC/DC变换器通过改变开关器件的占空比来实现变阻抗的工作，因此起到阻抗匹配电路的作用。作为基本相位，实验研究了该方法对反射功率的降低和效率的提高。
Nowadays, wireless power transfer via magnetic resonance coupling is researched and developed actively. This method enables power transfer with high efficiency across large air gap and is robust to displacement compared to traditional method. One of the problems for realization of such system is the increase of reflected power due to load variation and displacement. Reflected power will become loss in power source and result in declining efficiency of the power transfer. Therefore, impedance matching circuit becomes crucial for realization of high efficiency wireless power systems. In this paper, a novel method for reduction of reflected power using DC/DC converter is proposed. DC/DC converter operates like variable impedance by changing duty cycle of switching devices and therefore functions as impedance matching circuit. As a basic phase, reduction of reflected power and efficiency improvement by proposed method are investigated by experiment.