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<p>Conventional pulse power systems (PPS) suffer from inflexible parameter control and limited switching frequencies due to silicon-based devices and fixed modulation designs. This study presents an ultra-high frequency pulse power system (UF-PPS) based on silicon carbide (SiC) MOSFETs and adaptive waveform modulation. The system achieves a switching frequency of 200&#xa0;kHz through a full-bridge inverter architecture and ARM-based digital control, enabling dynamic adjustments of pulse waveforms, including trapezoidal, sinusoidal, and composite modes, with adjustable amplitude from 50 to 400 A and frequency from 10 to 30&#xa0;kHz. Experimental results demonstrate enhanced dynamic performance, such as a rise time of 119&#xa0;μs and fall time of 294&#xa0;μs, surpassing conventional IGBT-based systems by over 50%. The UF-PPS is validated in advanced tungsten inert gas welding of Inconel 718 superalloy, where increasing the proportion of ultra-high frequency pulse groups reduces the average grain size by 45% from 107.84 to 59.03&#xa0;μm. This innovation provides a versatile solution for high-precision energy control in advanced manufacturing, significantly improving process adaptability and microstructure refinement.</p>

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Dynamic waveform-controlled ultra-high frequency pulse power system enabled by SiC MOSFETs: design and welding applications

  • 期刊论文

  • 发表日期：

    2026年1月22日

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  • Jianwen Wu,
  • Wenyan Fan,
  • Ruiqiang Lu,
  • Bingfeng Li,
  • Yihui Li,
  • Xinshen Huang,
  • Jia Zhang,
  • Zheng Wu,
  • Zhenmin Wang,
  • Hao Li

摘要

Conventional pulse power systems (PPS) suffer from inflexible parameter control and limited switching frequencies due to silicon-based devices and fixed modulation designs. This study presents an ultra-high frequency pulse power system (UF-PPS) based on silicon carbide (SiC) MOSFETs and adaptive waveform modulation. The system achieves a switching frequency of 200 kHz through a full-bridge inverter architecture and ARM-based digital control, enabling dynamic adjustments of pulse waveforms, including trapezoidal, sinusoidal, and composite modes, with adjustable amplitude from 50 to 400 A and frequency from 10 to 30 kHz. Experimental results demonstrate enhanced dynamic performance, such as a rise time of 119 μs and fall time of 294 μs, surpassing conventional IGBT-based systems by over 50%. The UF-PPS is validated in advanced tungsten inert gas welding of Inconel 718 superalloy, where increasing the proportion of ultra-high frequency pulse groups reduces the average grain size by 45% from 107.84 to 59.03 μm. This innovation provides a versatile solution for high-precision energy control in advanced manufacturing, significantly improving process adaptability and microstructure refinement.