Wireless power transfer technology has seen steady advances in recent years, yet seamlessly charging devices within large volumes of space remains challenging. Although quasi-static cavity resonators have recently demonstrated safe wireless power transfer at room-scale sizes at significant power levels, previous work investigated this concept using coupled mode theory, lacking utility from the engineering perspective. This work presents a circuit model analysis of quasi-static cavity resonance-based wireless power transfer systems, which creates a critical conceptual bridge to the electrical engineering community and reveals factors that dominate the system performance and power transfer efficiency. A closed-form circuit model is derived from the geometrical properties of the system by analyzing the field distribution of a cylindrical cavity structure and is experimentally validated using a room-scale quasi-static cavity resonator. Finally, we demonstrate the utility of the derived circuit model through case studies for designing impedance matching circuits and optimization of the QSCR geometry.

中文翻译：

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用于无线电力传输的准静态腔体谐振器的基于几何的电路建模

近年来，无线电力传输技术取得了稳步发展，但在大空间内为设备无缝充电仍然具有挑战性。尽管准静态空腔谐振器最近已在显着功率水平下证明了在房间规模大小的安全无线电力传输，但之前的工作使用耦合模式理论研究了这一概念，从工程角度来看缺乏实用性。这项工作提出了基于准静态腔谐振的无线电力传输系统的电路模型分析，它为电气工程界建立了一个关键的概念桥梁，并揭示了主导系统性能和电力传输效率的因素。通过分析圆柱形腔结构的场分布，从系统的几何特性推导出闭合电路模型，并使用房间级准静态腔谐振器进行实验验证。最后，我们通过案例研究展示了导出电路模型在设计阻抗匹配电路和优化 QSCR 几何结构方面的实用性。