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Power Loss Analysis and Comparison of Segmented and Unsegmented Energy Coupling Coils for Wireless Energy Transfer

机译：无线能量传输中分段和非分段能量耦合线圈的功率损耗分析与比较

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摘要

This paper investigated the power losses of unsegmented and segmented energy coupling coils for wireless energy transfer. Four 30-cm energy coupling coils with different winding separations, conductor cross-sectional areas, and number of turns were developed. The four coils were tested in both unsegmented and segmented configurations. The winding conduction and intrawinding dielectric losses of the coils were evaluated individually based on a well-established lumped circuit model. We found that the intrawinding dielectric loss can be as much as seven times higher than the winding conduction loss at 6.78 MHz when the unsegmented coil is tightly wound. The dielectric loss of an unsegmented coil can be reduced by increasing the winding separation or reducing the number of turns, but the power transfer capability is reduced because of the reduced magnetomotive force. Coil segmentation using resonant capacitors has recently been proposed to significantly reduce the operating voltage of a coil to a safe level in wireless energy transfer for medical implants. Here, we found that it can naturally eliminate the dielectric loss. The coil segmentation method and the power loss analysis used in this paper could be applied to the transmitting, receiving, and resonant coils in two- and four-coil energy transfer systems.
机译：本文研究了用于无线能量传输的未分段和分段能量耦合线圈的功率损耗。开发了四个具有不同绕组间距，导体截面积和匝数的30厘米能量耦合线圈。在未分段和分段配置下测试了四个线圈。基于公认的集总电路模型分别评估了线圈的绕组传导和绕组内介电损耗。我们发现，紧密缠绕未分段的线圈时，绕组内的介电损耗可能比6.78 MHz时的绕组传导损耗高7倍之多。可以通过增加绕组间距或减少匝数来减少未分段线圈的介电损耗，但是由于磁通势的降低，功率传输能力也会降低。最近已经提出了使用谐振电容器的线圈分段，以在医疗植入物的无线能量传输中将线圈的工作电压显着降低到安全水平。在这里，我们发现它可以自然消除介电损耗。本文中使用的线圈分段方法和功率损耗分析可应用于两线圈和四线圈能量传输系统中的发射，接收和谐振线圈。

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    Sai Chun Tang; Nathan J. McDannold;

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  • 年(卷),期 -1(3),1
  • 年度 -1
  • 页码 215–225
  • 总页数 31
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