A dual-switch gain-enhanced step-up/step-down converter for fuel cell powertrain

IF 4.2 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Electric Power Systems Research Pub Date : 2025-09-12 DOI:10.1016/j.epsr.2025.112240

Kai Zhou, Yuhan Jiang, Shuchun Gao

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引用次数: 0

Abstract

To address the critical demand for matching the fuel cell stack output voltage with the vehicle DC-bus voltage in fuel cell vehicles (FCVs), this paper proposes a novel dual-switch gain-enhanced step-up/step-down converter (SUDC). The SUDC integrates a three-inductor structure with synchronized dual switches, and the synergy of its two inductors supports an ultra-wide input voltage range and realizes high voltage gain even under low duty cycle conditions. Meanwhile, the synchronous on/off control of the two switches not only simplifies the design of the control system but also minimizes input and output ripple. Additionally, the converter adopts a common-ground structure and provides positive output voltage that further optimizes its compatibility with the power systems of FCVs. This paper deeply analyzes the converter’s operating mechanism in continuous current mode (CCM), quantifies the voltage stress on switching and nonlinear components, and calculates the optimal inductance and capacitance parameters. The proposed converter effectively reduces system losses and improves conversion efficiency. A 300 W prototype was fabricated for validation. Experimental results show that the output voltage remains stable during input voltage fluctuations and load switching, and a maximum efficiency of 96.93 % is achieved under full-load conditions, verifying the correctness of the theoretical analysis and parameter design.

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用于燃料电池动力系统的双开关增益增强升压/降压转换器

为了解决燃料电池汽车（fcv）中燃料电池堆输出电压与整车直流母线电压匹配的关键需求，提出了一种新型的双开关增益增强升压/降压变换器（SUDC）。该SUDC集成了具有同步双开关的三电感结构，其两个电感的协同作用支持超宽输入电压范围，即使在低占空比条件下也能实现高电压增益。同时，两个开关的同步开/关控制不仅简化了控制系统的设计，而且最大限度地减少了输入输出纹波。此外，该变换器采用共地结构，输出电压为正，进一步优化了与fcv动力系统的兼容性。本文深入分析了变换器在连续电流模式下的工作机理，量化了开关元件和非线性元件的电压应力，并计算了最佳电感和电容参数。该变换器有效地降低了系统损耗，提高了转换效率。制作了一个300w的原型机进行验证。实验结果表明，在输入电压波动和负载切换过程中，输出电压保持稳定，满负荷状态下的效率最高可达96.93%，验证了理论分析和参数设计的正确性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Electric Power Systems Research 工程技术-工程：电子与电气

CiteScore

7.50

自引率

17.90%

发文量

963

审稿时长

3.8 months

期刊介绍： Electric Power Systems Research is an international medium for the publication of original papers concerned with the generation, transmission, distribution and utilization of electrical energy. The journal aims at presenting important results of work in this field, whether in the form of applied research, development of new procedures or components, orginal application of existing knowledge or new designapproaches. The scope of Electric Power Systems Research is broad, encompassing all aspects of electric power systems. The following list of topics is not intended to be exhaustive, but rather to indicate topics that fall within the journal purview. • Generation techniques ranging from advances in conventional electromechanical methods, through nuclear power generation, to renewable energy generation. • Transmission, spanning the broad area from UHV (ac and dc) to network operation and protection, line routing and design. • Substation work: equipment design, protection and control systems. • Distribution techniques, equipment development, and smart grids. • The utilization area from energy efficiency to distributed load levelling techniques. • Systems studies including control techniques, planning, optimization methods, stability, security assessment and insulation coordination.