Ultra-Fast Electric Vehicle Charging System Based on SEPIC Converter Integrated with the Utility Grid
DOI:
https://doi.org/10.15662/IJEETR.2026.0802205Keywords:
Electric vehicle charging, SEPIC converter, DC fast charging, closed-loop control, grid integration, power quality, constant current/constant voltage, smart grid, power electronics, battery chargingAbstract
The rapid proliferation of electric vehicles (EVs) has intensified the demand for efficient, reliable, and grid-compatible fast-charging infrastructure. Conventional charging systems often suffer from limited voltage regulation capability, reduced efficiency under variable grid conditions, and inadequate power quality management. These shortcomings necessitate the development of advanced power electronic converter topologies capable of supporting both step-up and step-down voltage operations while maintaining stable output under dynamic grid fluctuations.
This paper presents the design, analysis, and implementation of an ultra-fast EV charging system based on a Single-Ended Primary Inductor Converter (SEPIC) topology integrated with the utility grid. The proposed system employs a front-end AC-DC rectification stage to convert the grid-supplied alternating current into a regulated direct current, which is subsequently processed by the SEPIC converter to match the precise voltage and current requirements of the EV battery pack. The SEPIC topology is selected for its inherent capability to operate seamlessly in both buck and boost modes, providing non-inverting output and continuous input current — characteristics that are critically advantageous in EV charging applications subject to wide input voltage variations.
A closed-loop proportional-integral (PI) control strategy is implemented to regulate the output voltage and current in real time, ensuring adherence to constant current/constant voltage (CC/CV) charging profiles. This control mechanism enhances charging efficiency, suppresses output ripple, and safeguards battery integrity throughout the charging cycle. Simulation and experimental results demonstrate that the proposed system achieves significantly reduced charging times compared to conventional topologies, with improved power factor and reduced total harmonic distortion (THD) at the grid interface.The proposed architecture is well-suited for deployment in DC fast-charging stations and smart grid-integrated EV charging environments. The findings validate the SEPIC-based approach as a technically robust and practically viable solution for next-generation EV charging infrastructure, contributing to accelerated EV adoption and sustainable energy transition goals.
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