Analysis of Isolated DC-DC Converters for Electric-Vehicle (EV) Battery Charging

Electric vehicles (EVs) have advanced significantly in recent years in an effort to reduce pollution and energy crisis problems, thanks to government support. However, the need for a fast-charging and efficient system is limiting the development of EVs. In the development and manufacturing of EVs, it is essential to use the proper DC-DC converter topology for EV battery charging. The battery life and capacity must be maximized while designing the power converter. As a result, the power converter used to charge an EV's battery must be highly effective and ripple-free. This paper includes four distinct isolated converter topologies, The Dual Active Full Bridge (FBDAB), Full Bridge LLC (FBLLC), Flyback and Single-Ended Primary Inductance Converter (SEPIC) For the purpose of comparison. MATLAB Simulink is used to simulate all topologies under the same operating conditions. The comparison results indicate that, among the fundamental topologies, the FBLLC and FBDAB converters are preferred, however, with certain topology modifications, due to inherent input inductance, SEPIC converter shows tremendous promise in EV charging application. In addition, to this study the fundamental design, modeling, and operation of all four converters are presented. The design approaches and design factors of the prototype of all four converters of power rating 1.5 kW is discussed.