An Output Feedback Discrete-Time Controller for the DC-DC Buck Converter

Martin A. Alarcón-Carbajal, José E. Carvajal-Rubio, Juan D. Sánchez-Torres, David E. Castro-Palazuelos and Guillermo J. Rubio-Astorga
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Martin A. Alarcón-Carbajal: División de Estudios de Posgrado e Investigación, Tecnológico Nacional de México/IT de Culiacán, Culiacán 80220, Mexico
José E. Carvajal-Rubio: Departamento de Control Automatico, CINVESTAV, Zapopan 45019, Mexico
Juan D. Sánchez-Torres: Department of Mathematics and Physics, ITESO, San Pedro Tlaquepaque 45604, Mexico
David E. Castro-Palazuelos: División de Estudios de Posgrado e Investigación, Tecnológico Nacional de México/IT de Culiacán, Culiacán 80220, Mexico
Guillermo J. Rubio-Astorga: División de Estudios de Posgrado e Investigación, Tecnológico Nacional de México/IT de Culiacán, Culiacán 80220, Mexico

Energies, 2022, vol. 15, issue 14, 1-21

Abstract: This paper presents a discrete-time output feedback controller to regulate the output voltage of a DC-DC buck converter. The proposal’s main feature is the application of a discrete-time equivalent of the robust exact filtering differentiator. First, the document exposes a theoretical analysis of the closed-loop system, where it is considered the problem of implementing a real-time differentiator with a good relationship between exactness and noise filtration performance. Hence, secondly, the controller in a laboratory setup is presented. The first experimental results suggest that the proposed controller exhibits good robustness against noise and maintains the asymptotic accuracy, even with saturated control inputs, as in the case of the DC-DC buck converter. Consequently, aiming to verify the features of the proposed method, the controller is validated through multiple experiments, showing satisfactory voltage tracking accuracy, good suppression of instantaneous load and supply voltage disturbances, and robustness against bounded measurement noise.

Keywords: DC-DC buck converter; digital control; nonlinear PID controller; robust exact filtering differentiator; saturated controller (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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