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This paper presents an improved topology for iso-lated DC-DC converter designed for electric vehicle applications, featuring a topology enhancement with two SiC MOSFETs in the post stage to enhance the conventional buck converter. The design, employing only four switches, significantly decreases costs while accomplishing high step-down voltage gain without requiring an unnecessarily high turn ratio. Energy recovery stored in the leakage inductance through a DC-blocking capacitor enhances efficiency. A practical implementation of a 120W, 4S0-60V system validates the proposed converter, supported by theoretical analysis. Switching frequency analysis and Simulink simulations demonstrate performance, investigating the structural merits of SiC MOSFETs, and their impact on the overall system. The system tested at high switching frequencies ranging from 20kHz to 100kHz, and Simulink is employed to analyze the topology's performance in terms of efficiency, losses, and size. Simulation results indicate an increased total system efficiency, validating the effectiveness of the proposed converter in electric vehicle power electronics.
Eltief et al. (Wed,) studied this question.
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