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Auto-tuning technology can achieve instantaneous correction of detuning states without any detection or control strategies, exhibiting strong power stability. However, the excessively high voltage and current stresses on the additional switches compromise system safety and limit the application in high-power scenarios. To address this issue, this paper proposes a stress optimization method, which ensures that the maximum stress on the switches does not exceed the input system voltage and current when the reactance fluctuates within a certain range. To validate this method, a 50–200W prototype with a semi-adaptive rectifier (SAR) is tested. The experimental results demonstrate that, with load ranging from 10 to 50 Ω and input reactance varying between 31.8 and 128.4 Ω, the voltage and current stresses of the proposed technology are limited to 0.12–1.03 times the input voltage and 0.4–1.05 times the input current, respectively. The system achieves a maximum efficiency of 95%, with a power fluctuation of only 4%.

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A Non-Actively Controlled Low-Stress Auto-Tuning WPT Technology with Decoupling of Resonant State and System Reactance

  • 会议论文

  • 发表日期：

    2026年

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  • Xinqi Kang,
  • Dong Guo,
  • Zeqi Shi

摘要

Auto-tuning technology can achieve instantaneous correction of detuning states without any detection or control strategies, exhibiting strong power stability. However, the excessively high voltage and current stresses on the additional switches compromise system safety and limit the application in high-power scenarios. To address this issue, this paper proposes a stress optimization method, which ensures that the maximum stress on the switches does not exceed the input system voltage and current when the reactance fluctuates within a certain range. To validate this method, a 50–200W prototype with a semi-adaptive rectifier (SAR) is tested. The experimental results demonstrate that, with load ranging from 10 to 50 Ω and input reactance varying between 31.8 and 128.4 Ω, the voltage and current stresses of the proposed technology are limited to 0.12–1.03 times the input voltage and 0.4–1.05 times the input current, respectively. The system achieves a maximum efficiency of 95%, with a power fluctuation of only 4%.