实验技术与管理2025，Vol.42Issue(3)：28-36,9.DOI:10.16791/j.cnki.sjg.2025.03.004
可重构变压器匝比的宽电压增益DAB变换器实验技术
Experimental technique for wide voltage-gain DAB converters with a reconfigurable transformer turns ratio
摘要
Abstract
[Objective]For compatibility with different battery voltages of electric vehicles(EVs),dual active bridge(DAB)converters for DC chargers need to realize wide voltage gain to output a wide range of DC voltages.However,the efficiency and reliability of existing DAB converters are decreased under wide voltage-gain conditions.A novel experimental technique is proposed to enhance the efficiency of wide voltage-gain DAB converters by reconfiguring the transformer turns ratio.[Methods]This paper analyzes the mechanism of efficiency decline in wide voltage-gain DAB converters.The experimental idea of the reconfigurable transformer turns ratio is proposed,and its feasibility is analyzed.The turns ratio of the transformer structure can be reconfigured by combining dual transformers with each other and bringing multiwinding transformers with different windings into or out of the circuit.Two circuit topologies of DAB converters with reconfigurable transformer turns ratios are proposed based on dual transformers and multiwinding transformers.The DAB converter with dual transformers(DT-DAB)can reconfigure three transformer turns ratios by controlling the secondary three-bridge legs.The DT-DAB converter has three voltage-matching regions over the entire voltage-gain range,where it has lower inductor rms current and higher efficiency.The DAB converter with a multiwinding transformer(RT-DAB)is capable of reconfiguring six transformer turns ratios by controlling three auxiliary switches.Similarly,the RT-DAB converter has six voltage-matching regions over the entire voltage-gain range,where it exhibits lower inductor rms current and higher efficiency.Experimental platforms are designed for DT-DAB and RT-DAB converters,including the overall design methodology of the prototype,the design methodology of the transformers,and the control schemes.Finally,the effectiveness of the proposed experimental technique for reconfiguring transformer turn ratios is verified through experiments.[Results]The experimental results show that:1)the proposed experimental technique of reconfiguring the transformer turns ratio ensures that the DAB converter achieves voltage matching over a wide voltage-gain range,with reduced inductor rms and peak currents.2)The proposed DT-DAB and RT-DAB converters maintain efficiencies in the range of 91.3%-98%and 91.5%-97.5%over a voltage-gain range of 0.4-2.5,respectively.3)The efficiency and reliability of the DAB converter are improved over a wide voltage-gain range using the proposed experimental technique.[Conclusions]In this paper,an experimental technique to reconfigure the transformer turns ratio of the DAB converter is proposed to improve its efficiency by ensuring the matching of the primary and secondary voltages under wide voltage gain.Two feasible topologies for reconfigurable transformer turn ratio DAB converters are proposed and analyzed using dual transformers and multiwinding transformers.The design methods of the experimental platforms for the two types of reconfigurable transformer turns ratio DAB converters are presented.The experimental results show that the proposed experimental technique of reconfiguring the transformer turns ratio can enable DAB converters to achieve lower peak and inductor rms currents and maintain higher efficiency under wide voltage-gain conditions.The proposed experimental technique is based on the application of DC charging for EVs with a wide voltage range and is aimed at improving the efficiency of wide voltage-gain DAB converters,to deepen students'understanding of EV charging technology,and to expand innovative experimental ideas in the study of power electronics.关键词
电动汽车充电/双有源桥变换器/宽电压增益/重构变压器匝比Key words
electric vehicle charging/dual active bridge converter/wide voltage gain/reconfiguring transformer turns ratio分类
信息技术与安全科学引用本文复制引用
张艺明,谢鸿彪,张韬,陈孝莺,程翔鹏..可重构变压器匝比的宽电压增益DAB变换器实验技术[J].实验技术与管理,2025,42(3):28-36,9.基金项目
国家自然科学基金项目(52107183) （52107183）
福建省杰青项目(2022J06011) （2022J06011）
