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<p>Phase-shifted Full-bridge (PSFB) converter is widely employed in renewable energy sources, electric vehicles, and energy storage systems, owing to its advantageous features, such as isolation and soft switching. Despite many papers on PSFB circuit design, modulation techniques, and control strategies and extensive study in the literature, there is a lack of comprehensive material that bridges the theoretical waveforms found in standard texts with the practical challenges encountered during hardware implementation, especially for engineering pedagogy. This paper aims to bridge that gap by providing a comprehensive overview of the PSFB converter. Starting from the ideal converter, the intricacies of the PSFB topology are explored by introducing one circuit nonideality at a time. The nonidealities include leakage inductance of the transformer, output capacitance of the device, switching frequency, gate pulse dead-time, switching ripple in the filter inductor, capacitances of transformer winding and rectifier diode, transformer magnetizing inductance, and series and shunt parasitic elements. The paper presents the multifaceted impacts of these parameters on the circuit operation and discusses the trade-offs posed for converter design. The analytical expressions, switching model in simulation, and experimental waveforms are compared for a 1&#xa0;kW, 400&#xa0;V to 48&#xa0;V system, demonstrating an excellent agreement. This paper enables an engineer initiating PSFB design with comprehensive insights into various aspects of advanced DC-DC converter operation.</p>

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Comprehensive analysis of phase-shifted full-bridge converter for optimal design

  • 期刊论文

  • 发表日期：

    2025年10月15日

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  • Roja P.,
  • Vinod John

摘要

Phase-shifted Full-bridge (PSFB) converter is widely employed in renewable energy sources, electric vehicles, and energy storage systems, owing to its advantageous features, such as isolation and soft switching. Despite many papers on PSFB circuit design, modulation techniques, and control strategies and extensive study in the literature, there is a lack of comprehensive material that bridges the theoretical waveforms found in standard texts with the practical challenges encountered during hardware implementation, especially for engineering pedagogy. This paper aims to bridge that gap by providing a comprehensive overview of the PSFB converter. Starting from the ideal converter, the intricacies of the PSFB topology are explored by introducing one circuit nonideality at a time. The nonidealities include leakage inductance of the transformer, output capacitance of the device, switching frequency, gate pulse dead-time, switching ripple in the filter inductor, capacitances of transformer winding and rectifier diode, transformer magnetizing inductance, and series and shunt parasitic elements. The paper presents the multifaceted impacts of these parameters on the circuit operation and discusses the trade-offs posed for converter design. The analytical expressions, switching model in simulation, and experimental waveforms are compared for a 1 kW, 400 V to 48 V system, demonstrating an excellent agreement. This paper enables an engineer initiating PSFB design with comprehensive insights into various aspects of advanced DC-DC converter operation.