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 modeling. The behaviors of the system between 20 kHz and 100 kHz at different switching frequencies were examined. Conventional PI controller was applied to test the dynamic response of the system and it was observed that voltage regulation was insufficient in cases such as input voltage and load changes in the system. 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 time, settlement time 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, the power is 100 W, and the overall efficiency of the system is 92.9%. The analysis and simulation results of the system were confirmed by experimental results.

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