Digital Linear and Nonlinear Controllers for Buck Converter
Shyama M1, P.Swaminathan2

1P.Swaminathan, Electrical & Electronics Engineering, Karunya University, Coimbatore, India.
2Shyama M, Electrical & Electronics Engineering, Karunya University, Coimbatore, India.

Manuscript received on February 15, 2012. | Revised Manuscript received on February 20, 2012. | Manuscript published on March 05, 2012. | PP: 332-342 | Volume-2 Issue-1, March 2012. | Retrieval Number: A0447022112/2012©BEIESP
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Abstract: Both linear PID controllers and fuzzy controllers are designed and implemented for a buck converter. Comparison between the two controllers is made in the aspect of design, implementation and experimental results. Design of fuzzy controllers is based on heuristic knowledge of the converter and tuned using trial and error, while the design of linear PID and PI controllers is based on the frequency response of the buck converter. Implementation of linear controllers is quite straightforward, while implementation of fuzzy controllers has its unique issues. A comparison of experimental results indicates that the performance of the fuzzy controller is superior to that of the linear PID and PI controllers. The fuzzy controller is able to achieve faster transient response, has more stable steady-state response, and is more robust under different operating points.

Keywords: DC-DC Converter, Buck Converter,PID
controller, Fuzzy logic controller