强耦合谐振无线电力传输系统的SAR分布

Xingyi Shi, Benjamin H. Waters, Joshua R. Smith
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引用次数: 7

摘要

在无线电力传输(WPT)系统中,组织加热是一个关键的安全问题。加热以特定吸收率(SAR)限制的形式进行调节,以防止在靠近人的地方使用无线电力传输时出现危险情况。植入式生物医学设备的操作依赖于无线电力传输,因为在这些系统中存在很高的组织加热潜力,因此特别令人感兴趣。在给定负载功率要求下,寻找降低SAR的方法可以减少组织发热和/或增加功率传输的限制。本研究探讨了强耦合无线电力传输系统的两种共振模式(同相和非同相)下的SAR加热,其中电力接收器被植入组织中。基于13.56 MHz附近真实平面发射/接收线圈模型和简化组织模型的全EM仿真结果表明,强耦合无线电力传输的高频模式(同相模式)显著降低了峰值和平均SAR加热。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
SAR distribution for a strongly coupled resonant wireless power transfer system
Tissue heating is a key safety consideration in wireless power transfer (WPT) systems. Heating is regulated in the form of specific absorption rate (SAR) limitations to prevent dangerous conditions when wireless power transfer is used in proximity to people. Implanted biomedical devices which depend on wireless power transfer for their operation are particularly of interest, as a high potential for tissue heating exists in these systems. Finding ways to reduce SAR for a given load power requirement enables reduced tissue heating and/or increased limits on power transmission. This work explores SAR heating in the two resonant modes (in-phase and out-of-phase) of a strongly coupled wireless power transfer system, where the power receiver is implanted in tissue. Results based on full EM simulation with realistic planar transmit/receive coil model near 13.56 MHz and simplified tissue model indicate that the higher frequency mode (out-of-phase mode) of strongly coupled wireless power transfer results in significantly lower peak and average SAR heating.
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