Investigation of closed-loop performance for an LCL resonant converter in a real-time operating system environment

Abstract

This study presents a comparative evaluation of proportional integral (PI) controller and fuzzy logic controller (FLC) for a modified Inductance-Capacitance-Inductance resonant converter. It has been simulated and the performance is analysed. A three-element LCL resonant converter working under load-independent operation is presented in this study. In this study, the applicability of the Philips Advanced RISC Machine (ARM) processor LPC 2148 is also investigated as the controller for resonant converter. The comparison study indicates the superiority of fuzzy control over the conventional control methods and these results are presented. MATLAB was used to model the LCL topology for varied loads and LCL configurations. The LCL resonant inverter is proposed for applications in high-frequency distributed AC power systems and resonant converter is proposed for applications in many space and radar power supplies. This study presents the design, simulation and experimental results for a 133-W, 50-KHz LCL resonant converter having efficiencies >89% down to resistive loads of 50%. Efficiencies >80% were obtained at significantly reduced loads (11%).