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With the continuous advancement of power electronics technology and the increasing number of electrical equipment, higher requirements are placed on the design of DC/DC converters. In particular, the voltage levels required for DC/DC converters in different links are quite different. Wide range input/output DC/DC converters have become a research hotspot in recent years. In this paper, the full-bridge LLC resonant converter is introduced. This converter can meet the requirements of wide input range, and it is convenient to realize soft switching, that is, the ZVS of the primary side MOSFET and the secondary side MOSFET, which significantly reduces the loss and improves the energy conversion efficiency. In order to meet the requirements of wide input range and isolation, a two-stage DC/DC power supply structure is proposed in this paper. The LLC resonant converter is used in the front stage and the Buck circuit topology is used in the back stage to form an isolated DC/DC power supply with wide input range. Finally, an ISOP (Input-Series-Output-Parallel) system composed of three single-module DC/DC converters is designed. The pre-stage adopts an open-loop fixed-frequency control method. The LLC converter works at the resonant point to achieve the highest conversion efficiency. The post-stage uses interleaved parallel technology to achieve stable output of large current.

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Three-Module DC/DC Converter Based on ISOP System in the Application of Wide Input Voltage

  • 会议论文

  • 发表日期：

    2025年

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  • Tong Lei,
  • Taojun Li,
  • Chaohui Cui,
  • Yihan Shi,
  • Rui Chu,
  • Haoran Li,
  • Cungang Hu

摘要

With the continuous advancement of power electronics technology and the increasing number of electrical equipment, higher requirements are placed on the design of DC/DC converters. In particular, the voltage levels required for DC/DC converters in different links are quite different. Wide range input/output DC/DC converters have become a research hotspot in recent years. In this paper, the full-bridge LLC resonant converter is introduced. This converter can meet the requirements of wide input range, and it is convenient to realize soft switching, that is, the ZVS of the primary side MOSFET and the secondary side MOSFET, which significantly reduces the loss and improves the energy conversion efficiency. In order to meet the requirements of wide input range and isolation, a two-stage DC/DC power supply structure is proposed in this paper. The LLC resonant converter is used in the front stage and the Buck circuit topology is used in the back stage to form an isolated DC/DC power supply with wide input range. Finally, an ISOP (Input-Series-Output-Parallel) system composed of three single-module DC/DC converters is designed. The pre-stage adopts an open-loop fixed-frequency control method. The LLC converter works at the resonant point to achieve the highest conversion efficiency. The post-stage uses interleaved parallel technology to achieve stable output of large current.