Comparison Of Different DC-DC Converters for EV Charger Applications

This paper presents a comparative analysis of three DC-DC converter topologies—Boost, Interleaved, and Quasi-Z-Source for electric vehicle (EV) charger applications. The primary objective is to assess their effectiveness in reducing charging time, a key parameter for efficient EV infrastructure. With increasing EV adoption, optimizing charger design remains critical to support transportation needs. Simulations conducted in MATLAB/Simulink evaluated these converters charging a 320 V, 100 Ah lithium-ion battery from 20% to 80% state of charge (SOC) using a 110 V, 60 Hz grid input. Results indicate the Quasi-Z-Source converter achieves the shortest charging time of 1.35 hours, outperforming the interleaved converter at 1.5 hours and the Boost converter at 1.62 hours. This 11-18% advantage arises from its enhanced boost factor and lower switching stress, improving energy transfer efficiency. The Boost converter, despite simplicity, demonstrates slower charging due to discontinuous output, while the interleaved converter reduces ripple but offers limited voltage gain. These findings highlight the Quasi-Z-Source converter's suitability for fast-charging systems, offering quantitative insights for selecting topologies in EV charger design and advancing infrastructure efficiency.