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<p>Frequency tracking is an effective approach to improve the transmission efficiency and output power of magnetically coupled resonant wireless power transfer (MCR-WPT) systems. To investigate detuning control, an SS-topology equivalent circuit model is established, and the expressions of output power and transmission efficiency are derived. The transmitter/receiver voltage–current relations are formulated, and the input impedance angle is obtained. The impacts of frequency offset, impedance change, and coil misalignments (axial, radial, and angular offsets) on the impedance angle are evaluated by numerical analysis. Based on these results, a differential phase-identification digital phase-locked loop is proposed for frequency tracking. For constant-voltage output, a half-controlled active rectifier strategy is proposed. The proposed framework integrates detuning-robust frequency tracking and receiver-side constant-voltage regulation without an additional DC/DC post-stage or any communication link. An experimental platform is built for verification. The validation is currently limited to a single 24-V prototype and a load range of 10–50 Ω; future work will extend the method to a broader power level and a wider coupling/misalignment range.</p>

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Study on frequency tracking and active rectifier constant voltage output of full digital phase-locked loop for wireless power transmission system

  • 期刊论文

  • 发表日期：

    2026年4月9日

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  • Zhao Yongxiu,
  • Wei Mengxiang,
  • Zhu Longji,
  • Jia Haoyang,
  • Zhang Yi

摘要

Frequency tracking is an effective approach to improve the transmission efficiency and output power of magnetically coupled resonant wireless power transfer (MCR-WPT) systems. To investigate detuning control, an SS-topology equivalent circuit model is established, and the expressions of output power and transmission efficiency are derived. The transmitter/receiver voltage–current relations are formulated, and the input impedance angle is obtained. The impacts of frequency offset, impedance change, and coil misalignments (axial, radial, and angular offsets) on the impedance angle are evaluated by numerical analysis. Based on these results, a differential phase-identification digital phase-locked loop is proposed for frequency tracking. For constant-voltage output, a half-controlled active rectifier strategy is proposed. The proposed framework integrates detuning-robust frequency tracking and receiver-side constant-voltage regulation without an additional DC/DC post-stage or any communication link. An experimental platform is built for verification. The validation is currently limited to a single 24-V prototype and a load range of 10–50 Ω; future work will extend the method to a broader power level and a wider coupling/misalignment range.