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To solve the electromagnetic interference (EMI) problem caused by current overshoot and hard switching noise in wireless power transfer (WPT) system during start-up, a cooperative control strategy combining passive auxiliary circuit and phase-shifted soft start is proposed. Zero voltage switching (ZVS) in the whole process of LCC-S resonant topology is realized by introducing a passive auxiliary circuit composed of inductor, diode and capacitor. Meanwhile, the method of phase shifting to adjust the output duty ratio of inverter is adopted to realize slow injection of electric energy to suppress current overshoot during start-up. A simulation model of 1.2 kW is built. The simulation results show that: In the case of 100 μF large filter capacitor, the proposed method can suppress the peak value of start-up current to 7.7 A (74% lower than that of fixed-frequency operation mode), and reduce the EMI to -23.8 dBmA at 50 MHz band. The problems of soft switching and overshoot current suppression are effectively solved, and the system reliability is improved.

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Dynamics Optimization Method for LCC-S WPT System Based on Auxiliary Circuit and Phase Shift Control

  • 会议论文

  • 发表日期：

    2026年

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  • Zijiang Shang,
  • Pengqi Deng,
  • Yi Huang,
  • Lin Yang,
  • Lang Kuang

摘要

To solve the electromagnetic interference (EMI) problem caused by current overshoot and hard switching noise in wireless power transfer (WPT) system during start-up, a cooperative control strategy combining passive auxiliary circuit and phase-shifted soft start is proposed. Zero voltage switching (ZVS) in the whole process of LCC-S resonant topology is realized by introducing a passive auxiliary circuit composed of inductor, diode and capacitor. Meanwhile, the method of phase shifting to adjust the output duty ratio of inverter is adopted to realize slow injection of electric energy to suppress current overshoot during start-up. A simulation model of 1.2 kW is built. The simulation results show that: In the case of 100 μF large filter capacitor, the proposed method can suppress the peak value of start-up current to 7.7 A (74% lower than that of fixed-frequency operation mode), and reduce the EMI to -23.8 dBmA at 50 MHz band. The problems of soft switching and overshoot current suppression are effectively solved, and the system reliability is improved.