Design and Implementation of a FLC for DC-DC Converter in a Microcontroller for PV System
Abel García B.Francisco R.Trejo-M.1, Felipe Coyotl-M.2, Rubén Tapia-O. Hugo Romero-T.3

1Abel García-B. and Francisco R. Trejo-M. are with Robotics and Advanced Electronics Research Laboratory, Mechatronics Department, Polytechnic University of Pachuca, Zempoala, Hidalgo, Mexico.
2Felipe Coyotl-M. and Rubén-T. are with Electrical Engineering Department, Polytechnic University of Tulancingo, Tulancingo, Hidalgo, Mexico.
3Hugo Romero-T., is with Research Center for Information Technologies and Systems at the Autonomous University of Hidalgo State (UAEH), Hidalgo, Mexico..
Manuscript received on June 05, 2013. | Revised Manuscript received on June 29, 2013. | Manuscript published on July 05, 2013. | PP: 26-30 | Volume-3 Issue-3, July 2013. | Retrieval Number: C1607073313/2013©BEIESP
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Abstract: This paper presents the design and implementation of a simple fuzzy logic controller (FLC) for a DC-DC buck converter based on the PIC18F4550 microcontroller to control the lead acid battery charging voltage in solar cells applications. For cost consideration, an inexpensive 8-bit microcontroller is selected to program and implement the FLC proportional-integral. The obtained simulation and experimental results show the viability of the controller with a variation on the load of the buck converter showing a good performance on the design of the FLC, and it has also a smooth response with a small overshoot. The DC-DC converter designed in this work can be found applications in low cost photovoltaic (PV) systems, although in the literature has been already reported this kind of devices with a better response [3-4], however these use a expensive microcontroller or its designs are very complex, and where these are not necessary for this kind of applications. Finally, a prototype PV system with 100 V/6 A has been implemented for verifying the feasibility of the CD-CD converter.
Keywords: DC-DC converter, fuzzy logic control, and Microcontroller.