Hybrid PI-fuzzy logic controller based DC-DC converter

DC-DC converters are used to convert one DC voltage to other. One of the main limitations of these converters is unregulated supply of voltage and current. To overcome these problems there are various control techniques used in combination with these converters. The aims of developing the converters are high efficiency and high gain with fast response. A feedback controller for DC-DC boost converter is designed to obtain constant output voltage. Design equations are derived and it is modeled in MATLAB. Extensive simulation is carried out with linear controller parameters and the results are presented. Fuzzy logic controllers (FLC) and FLC tuned by PI controller have been investigated. The comparative study Results point out that FLC tuned by PI controller is superior to the other control strategies because of fast transient response, minimum steady state error and good disturbance rejection under various variations of the operating conditions. Hence, it achieves the most closely output voltage regulation.