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<p>This paper presents a resonant frequency tracking method for wireless power transfer (WPT) systems using a peak detector algorithm with a 3-point coarse and halved-fine tracking strategy. The proposed approach works without using primary-side voltage or secondary-side voltage and current, and determines the resonant frequency solely from the primary-side current peak, enabling fast, simple, and accurate frequency convergence. The proposed system is implemented with a STM32G4 module, coils, and discrete components. Experimental results verify that the proposed system achieves fast and stable tracking performance under various load conditions. The tracking time was measured as 1.87 ms at 50 Ω and 2.09 ms at 5 Ω, maintaining a consistent frequency tracking error of 125&#xa0;Hz across the Qi standard operating range of 80–300&#xa0;kHz. The proposed method achieved a peak power transfer efficiency of 92%, corresponding to an improvement of up to 10% at 50 Ω and 6.9% at 5 Ω compared with conventional fixed-frequency operation, demonstrating both a high-speed response and wide-range efficiency stability.</p>

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Fast-tracking-time peak detector algorithm for wireless power transfer systems with 80–300 kHz wide frequency range

  • 期刊论文

  • 发表日期：

    2026年5月20日

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  • Youngseok Ko,
  • Eunho Choi,
  • Hyunkyeong Jo,
  • Heeyoung Chae,
  • Shihong Park

摘要

This paper presents a resonant frequency tracking method for wireless power transfer (WPT) systems using a peak detector algorithm with a 3-point coarse and halved-fine tracking strategy. The proposed approach works without using primary-side voltage or secondary-side voltage and current, and determines the resonant frequency solely from the primary-side current peak, enabling fast, simple, and accurate frequency convergence. The proposed system is implemented with a STM32G4 module, coils, and discrete components. Experimental results verify that the proposed system achieves fast and stable tracking performance under various load conditions. The tracking time was measured as 1.87 ms at 50 Ω and 2.09 ms at 5 Ω, maintaining a consistent frequency tracking error of 125 Hz across the Qi standard operating range of 80–300 kHz. The proposed method achieved a peak power transfer efficiency of 92%, corresponding to an improvement of up to 10% at 50 Ω and 6.9% at 5 Ω compared with conventional fixed-frequency operation, demonstrating both a high-speed response and wide-range efficiency stability.