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This paper studies the optimal design method of aeronautical DC/DC converter with wide voltage input. The topology of the converter is Buck + LLC-DCX. The converter works at high frequency, so the GaN power devices with better performance are selected. The magnetic components and related circuit parameters of the two-stage converter are optimized. The negative coupling inductor is adopted in the interleaved buck to make the flux distribution more uniform and increase the equivalent inductance of the converter. For the second stage LLC, design the excitation inductor considering the nonlinear output capacitance of GaN firstly. Then integrate the matrix transformer to reduce the height of the transformer, and further proposes the design scheme of low-height transformer with open air gap in the middle, which makes the flux distribution of the transformer more uniform, the core loss and winding loss are reduced. Finally, a 200–400 V input, 28 V/1kW output prototype is developed, and the experimental waveform and test data are given. The peak efficiency reaches 96.08%.

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Optimized Design of a Wide Input Range DC Converter Based on GaN Transistors

  • 会议论文

  • 发表日期：

    2025年

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  • Sijia Xu,
  • Teng Tu,
  • Fanghua Zhang,
  • Yu Zhu,
  • Hongxin Mei,
  • Haitao Li

摘要

This paper studies the optimal design method of aeronautical DC/DC converter with wide voltage input. The topology of the converter is Buck + LLC-DCX. The converter works at high frequency, so the GaN power devices with better performance are selected. The magnetic components and related circuit parameters of the two-stage converter are optimized. The negative coupling inductor is adopted in the interleaved buck to make the flux distribution more uniform and increase the equivalent inductance of the converter. For the second stage LLC, design the excitation inductor considering the nonlinear output capacitance of GaN firstly. Then integrate the matrix transformer to reduce the height of the transformer, and further proposes the design scheme of low-height transformer with open air gap in the middle, which makes the flux distribution of the transformer more uniform, the core loss and winding loss are reduced. Finally, a 200–400 V input, 28 V/1kW output prototype is developed, and the experimental waveform and test data are given. The peak efficiency reaches 96.08%.