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<p>This paper proposes a flying capacitor seven-level soft-switching power amplifier for high-precision gradient coil driving in magnetic resonance imaging. The topology integrates multilevel output and soft-switching operation, reducing voltage stress and switching losses. A trapezoidal filter current control strategy is introduced to enhance tracking accuracy. A 200 W prototype was implemented and tested. Experimental results show that the flying capacitor voltages stabilize at multiple expected levels, zero-voltage switching is achieved under various loads, and the output current exhibits low harmonic distortion. The system achieves a peak efficiency of 97.1% within a switching frequency range of 8–17 kHz, confirming the feasibility and performance advantages of the proposed design.</p>

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Research on Flying Capacitor Seven Level Soft-Switching Power Amplifier in Gradient Coil Drive Application

  • 期刊论文

  • 发表日期：

    2026年3月23日

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  • Jian Wei,
  • Zhichao Guo,
  • Chen Liu,
  • Xiaokun Zhao,
  • Weinan Wang,
  • Zhanfei Huo,
  • Jiawei Zhang,
  • E. Peng

摘要

This paper proposes a flying capacitor seven-level soft-switching power amplifier for high-precision gradient coil driving in magnetic resonance imaging. The topology integrates multilevel output and soft-switching operation, reducing voltage stress and switching losses. A trapezoidal filter current control strategy is introduced to enhance tracking accuracy. A 200 W prototype was implemented and tested. Experimental results show that the flying capacitor voltages stabilize at multiple expected levels, zero-voltage switching is achieved under various loads, and the output current exhibits low harmonic distortion. The system achieves a peak efficiency of 97.1% within a switching frequency range of 8–17 kHz, confirming the feasibility and performance advantages of the proposed design.