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    Design of a high-efficiency battery charging system based on MPPT for electric vehicles
    (İdris Karagöz, 2024) Arslan, Leyla; Özbay, Harun
    In today's world, with the rapid increase in the global population and technological advancements, the demand for energy is increasing day by day. Considering that a significant portion of the required energy is produced from fossil fuels, the limited availability of fossil fuels, and their harmful environmental effects, the importance of transitioning to renewable energy sources has become evident. Therefore, renewable energy sources such as solar, wind, and geothermal have gained popularity. The widespread use of renewable energy sources has also opened the way for the adoption of electric vehicles. With advancements in battery technology and charging systems, high-efficiency battery charging systems for electric vehicles have been developed. In this study, a solar energy-based design of a battery charging system, which is crucial for electric vehicles, has been realized. Different Maximum Power Point Tracking (MPPT) algorithms have been compared to obtain the maximum power from solar energy. To achieve maximum efficiency in energy transfer to the load, a Zero Voltage Switching (ZVS) technique has been applied to the SEPIC DC-DC converter. By using the Zero Voltage Switching technique, switching losses on the switch have been minimized. The duty cycle and frequency are adjusted according to the power variation in the system. The simulation of the system has been performed using PSIM. A comparison has been made in terms of power tracking and system efficiency for the Perturb & Observe (P&O) and Incremental Conductance (IC) algorithms at solar irradiance levels of 400-600-1000-500 W/m2. Both algorithms have successfully tracked the panel power and achieved efficiencies above 99%. The highest efficiency in transferring maximum power, 99.86%, has been achieved with the Incremental Conductance algorithm.