Adaptive Barrier Function Enhanced Super Twisting Sliding Mode Control for 800 V EV Fast Charging Using a Resonant AC-DC Converter

This paper presents an Adaptive Barrier Function Enhanced Super Twisting Sliding Mode Control (ABFST-SMC) strategy for an 800 V fast EV charger based on a high-frequency current-fed resonant AC-DC converter. It addresses the drawbacks of traditional multi-stage chargers, including high losses, more components and decreased efficiency at high power levels. The proposed approach configures active voltage/current (V/I) doubler topology on both primary and secondary sides to achieve high voltage gain, decreased ripple, and enhanced dynamic response. The ABFST-SMC ensures robust power factor correction (PFC), output voltage regulation and low input current total harmonic distortion (THD) while maintaining ZVS/ZCS switching conditions. A thorough validation is carried out through PSIM simulations and MATLAB/Simulink based Controller-in-the-loop (CIL) testing with Delfino F28379D dual core microcontroller. Results shows effective power transfer, almost unity power factor and sustainable grid-to-vehicle operation for next-generation 800 V EV architectures.