Implementation of Fuzzy Logic Controller for DC–DC step Down Converter
Shaik Gousia begum1, Syed Sarfaraz Nawaz2, G. Sai Anjaneyulu3

1Shaik Gousia Begum*, EEE (Power Electronics), GRIET (JNTUH), Hyderabad, India.
2Syed Sarfaraz Nawaz, EEE Department, GRIET (JNTUH), Hyderabad, India.
3G. Sai Anjaneyulu, EEE (Power Electronics), GRIET (JNTUH), Hyderabad, India. 

Manuscript received on June 17, 2021. | Revised Manuscript received on June 25, 2021. | Manuscript published on June 30, 2021. | PP: 109-112 | Volume-10, Issue-8, June 2021 | Retrieval Number: 100.1/ijitee.H92510610821| DOI: 10.35940/ijitee.H9251.0610821
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Abstract: This paper presents the design of a Fuzzy logic controller for a DC-DC step-down converter. Buck converters are step-down regulated converters which convert the DC voltage into a lower level standardized DC voltage. The buck converters are used in solar chargers, battery chargers, quadcopters, industrial and traction motor controllers in automobile industries etc. The major drawback in buck converter is that when input voltage and load change, the output voltage also changes which reduces the overall efficiency of the Buck converter. So here we are using a fuzzy logic controller which responds quickly for perturbations, compared to a linear controllers like P, PI, PID controllers. The Fuzzy logic controllers have become popular in designing control application like washing machine, transmission control, because of their simplicity, low cost and adaptability to complex systems without mathematical modeling So we are implementing a fuzzy logic controller for buck converter which maintains fixed output voltage even when there are fluctuations in supply voltage and load. The fuzzy logic controller for the DC-DC Buck converter is simulated using MATLAB SIMULINK. The proposed approach is implemented on DC-DC step down converter for an input of 230V and we get the desired output for variations in load or references. This proposed system increases the overall efficiency of the buck converter. 
Keywords: DC-DC Buck Converter, Fuzzy Logic Controller, Pulse Width Modulation (PWM), MATLAB SIMULINK.