Design of Super Twisting SMC based Quasi Single Stage Current Fed Resonant AC-DC Converter with Improved Heat Distribution for EV Charger

Abstract

In response to the growing demand for efficient charging solutions for electric vehicles (EVs), this research introduces a robust non-linear control strategy for Electric Vehicle (EV) charger, employing a high-performance single-stage AC-DC current-fed resonant quasi converter. The proposed research recommends implementing a super-twisting sliding mode controller (ST-SMC) to robustly control an EV charger, ensuring precise regulation of current and voltage for battery charging purposes. The converter’s design features high-frequency operation, less switching losses, enhanced efficiency, and unity power factor, making it an appealing choice for EV charging infrastructure. Fixed duty ratio of 0.5 at primary side switches reduces the input current ripples inspite of the variation in grid voltage and different load. Primary side switches turn ON at voltage close to zero (ZVS) while bidirectional switches at secondary side shows ZVS phenomenon at turn OFF instants that effectively reduces the switching losses and shows amended efficiency. It shows the effectiveness of design and control approach, presenting rapid response and precise output voltage regulation under various operating conditions as discussed in this paper. The validation of the controller's performance and safety is conducted through hardware-in-loop (HIL) based experimental verification employing the Delfino F28369D dual-core microcontroller. The proposed converter and control algorithm is simulated using MATLAB/Simulink and PSIM software.