This article proposes and implements a hybrid frequency pacing (HFP) technique for resonating a high-order transformed wireless power transfer (WPT) system with robust zero-voltage switching (ZVS). As a hybrid frequency modulation, the proposed HFP can efficiently tune the innate constant-frequency resonances of WPT. It can facilitate the pulsewidth modulated inverters to totally get rid of the high-frequency hard-switching while reducing the switching frequency and improving the system efficiency. For typical low-order boost WPT-based scenarios, the rectification effect may cause waveform distortions and involve a very low virtual capacitance, thus leading to great degradations on the ZVS and zero-phase-angle operation. In addition to achieve a load-independent constant voltage/current output, a high-order LCC network is deeply investigated to act as two-stage impedance transformations. By flexibly utilizing the rectification-caused virtual derivatives with the high-order transformations, it reliably contributes to a robust ZVS-HFP. The experimental system efficiency can be more than 91.5% with the full-range ZVS operation. Theoretical analysis and experimental results are both provided to verify the feasibility of the proposed ZVS-HFP for tuning the high-order LCC-transformed WPT system.

中文翻译：

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用于高阶变换无线功率传输的混合频率起搏


本文提出并实现了一种混合频率起搏 (HFP) 技术，用于使具有鲁棒零电压开关 (ZVS) 的高阶变换无线电力传输 (WPT) 系统产生谐振。作为一种混合频率调制，所提出的 HFP 可以有效地调整 WPT 固有的恒定频率谐振。它可以帮助脉宽调制逆变器完全摆脱高频硬开关，同时降低开关频率，提高系统效率。对于典型的基于低阶升压WPT的场景，整流效应可能会导致波形失真并且涉及非常低的虚拟电容，从而导致ZVS和零相位角操作的极大退化。除了实现与负载无关的恒定电压/电流输出之外，还深入研究了高阶LCC网络以充当两级阻抗变换。通过灵活地利用整流引起的虚拟导数和高阶变换，它可靠地有助于实现鲁棒的 ZVS-HFP。实验系统全范围ZVS运行效率可达91.5%以上。理论分析和实验结果都验证了所提出的 ZVS-HFP 用于调节高阶 LCC 变换 WPT 系统的可行性。