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The hybrid switch takes full advantage of the low conduction loss and high current-carrying capability of the Si IGBT, as well as the fast switching speed and low switching loss of the SiC MOSFET. Through separate control of the power devices, it achieves zero-voltage switching for the Si IGBT at low current levels and for the SiC MOSFET at high current levels. Most literature on hybrid switches only studies the parallel connection of one SiC MOSFET and one Si IGBT. This paper adopts three SiC MOSFETS and three Si IGBTS in parallel. To minimize power loss in the multi-parallel hybrid switch, an optimal switching combination control strategy is proposed, and a loss model for the multi-parallel hybrid switch is established. Through double-pulse simulation tests, the switching losses of different switching combinations under various load currents were analyzed. The implementation of this optimized method within a buck converter demonstrated the benefits of the optimal switching control strategy for the multi-parallel hybrid switch. Compared to the efficiency of a converter with six Si IGBTS in parallel, when the load current is 20A, the efficiency increased by 4.01% using the optimal switching combination strategy. When the load current is 40A, the efficiency increased by 2.23%, and when the load current is 100A, the efficiency increased by 0.77%.

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Optimal Switching Combination Control Strategy for Multi-Parallel Si IGBT/SiC MOSFET Hybrid Switching Devices

  • 会议论文

  • 发表日期：

    2025年

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  • Lei He,
  • Ke Xia,
  • Siqi Li,
  • Sizhao Lu

摘要

The hybrid switch takes full advantage of the low conduction loss and high current-carrying capability of the Si IGBT, as well as the fast switching speed and low switching loss of the SiC MOSFET. Through separate control of the power devices, it achieves zero-voltage switching for the Si IGBT at low current levels and for the SiC MOSFET at high current levels. Most literature on hybrid switches only studies the parallel connection of one SiC MOSFET and one Si IGBT. This paper adopts three SiC MOSFETS and three Si IGBTS in parallel. To minimize power loss in the multi-parallel hybrid switch, an optimal switching combination control strategy is proposed, and a loss model for the multi-parallel hybrid switch is established. Through double-pulse simulation tests, the switching losses of different switching combinations under various load currents were analyzed. The implementation of this optimized method within a buck converter demonstrated the benefits of the optimal switching control strategy for the multi-parallel hybrid switch. Compared to the efficiency of a converter with six Si IGBTS in parallel, when the load current is 20A, the efficiency increased by 4.01% using the optimal switching combination strategy. When the load current is 40A, the efficiency increased by 2.23%, and when the load current is 100A, the efficiency increased by 0.77%.