Design and experimental implementation of DC-DC converter based self-tuning fuzzy PI controller

Abstract

In this study, self-tuning fuzzy PI (SFPI) controller-based DC-DC boost converter topology is presented. The closed-loop transfer function of the converter was obtained, and its design was performed by examining the small-signal model for stability analysis. The input-output relationship has been verified by black-box modelling. The system's behaviours between 20 kHz and 100 kHz at different switching frequencies were examined. The control of the designed DC-DC converter was first performed with a conventional PI controller. It has been observed that the performance of the voltage regulation against the input voltage and load changes of the system in the PI controller is insufficient. Therefore, SFPI controller is proposed to improve the output voltage regulation of the converter. With the proposed SFPI, the PI controllers were compared with performance criteria such as rise, settlement, and overshoot. According to the results of the analysis, it was observed that the system efficiency was improved by reducing the losses in power conversion by designing the proposed controller and snubber circuits. The nominal voltage of the prototype converter is 48 V, and the power is 100 W; in this case, the measured efficiency is 89.57%. The peak efficiency of the DC-DC converter was 92.9%. Experimental results confirmed the analysis and simulation results of the system. © 2023 Gazi Universitesi Muhendislik-Mimarlik. All rights reserved.