DEVELOPMENT OF OPTIMISED ISOLATED DC-DC CONVERTER FOR ULTRA WIDE OUTPUT RANGE IN EV FAST CHARGING

The increasing adoption of electric vehicles (EVs) necessitates advanced fast charging solutions with high efficiency and adaptability. Existing DC-DC converters in EV charging systems often face limitations such as narrow output voltage ranges, reduced efficiency at partial loads, and complex control mechanisms. These drawbacks hinder their ability to meet the diverse charging requirements of modern EVs, highlighting the need for optimized converter designs with ultra-wide output ranges and improved performance.
    This project proposes an optimized DC-DC converter design for ultra-wide output range applications in electric vehicle (EV) fast charging systems. The proposed converter architecture integrates a high-frequency switching circuit, a resonant tank, and an isolation transformer to achieve high efficiency and flexibility across a broad voltage range. The design employs a parallel synchronous rectifier to minimize conduction losses and enhance power delivery.
    A high-frequency PWM pulse generator, driven by a dsPIC30F4011 controller, ensures precise control over the output voltage and current. The use of TLP250 driver circuits further enhances the reliability and performance of the switching components. The input DC supply is filtered to reduce noise and ensure stable operation, making the converter suitable for diverse EV charging scenarios.
    Experimental results demonstrate the converter's ability to maintain high efficiency and robust performance across a wide range of load conditions, making it an ideal solution for next-generation fast charging infrastructure. This work highlights the potential of advanced DC-DC converter topologies in addressing the growing demands for efficient and adaptable EV charging systems. The system is implemented using MATLAB/Simulink 2024a and a dsPIC30F4011 controller.