Robust control algorithm by adjusting input voltage for DC-DC converters.

Yanhua Xian; Jiuchao Feng

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Robust control algorithm by adjusting input voltage for DC-DC converters.

Author(s)

Yanhua Xian School of Electronic and Information Engineering, South China University of Technology, Guangdong, 510641, Guangzhou, China;College of Electronic Engineering, Guangxi Normal University, Guangxi, 541004, Guilin, China

Jiuchao Feng School of Electronic and Information Engineering, South China University of Technology, Guangdong, 510641, Guangzhou, China

Abstract

In view of the switching property and the existence of disturbance in DC-DC converters, a robust control algorithm by adjusting input voltage is studied based on the switched linear model of DC-DC converters. Considering the output disturbance and weighted functions chosen for perturbation input and controlled output, the augmented switched linear model of DC-DC converters is established, in which the input voltage is as control variable. According to linear matrix inequality (LMI) and H_ control theories, the sufficient condition of controller existence and the design method of H_ controller for the proposed switched system are derived in the form of LMI. The obtained controller is such that the closed loop system is asymptotically stable under arbitrary switch conditions and has an H_ disturbance attenuation bound. The simulation results for buck and boost converters are presented to show that the good robust stability can be obtained with respect to the output disturbance. By adjusting the input voltage, the output voltage can be stabilized on the expected value with the parameters perturbation under arbitrary constant duty cycle, which demonstrates the effectiveness of the proposed algorithm.

Publication Details

Page(s) 316-232

DOI DOI not available

Published Journal: Journal of Theoretical and Applied Information Technology, Volume: 49, Issue: 1, Year: 2013

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