Open AccessAnalysis and design of a sliding‐mode strategy for start‐up control and voltage regulation in a buck converter
Author(s) -
MartínezSalamero Luis,
García Germain,
Orellana Marcos,
Lahore Cyril,
Estibals Bruno,
Alonso Corinne,
Carrejo Carlos Eduardo
Publication year - 2013
Publication title -
iet power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.637
H-Index - 77
eISSN - 1755-4543
pISSN - 1755-4535
DOI - 10.1049/iet-pel.2011.0494
Subject(s) - control theory (sociology) , voltage , buck converter , inrush current , computer science , physics , control (management) , quantum mechanics , artificial intelligence , transformer
This study presents the analysis and design of a sliding‐mode control of a buck converter operating in continuous conduction mode that minimises the energy during start‐up and provides output voltage regulation in front of input voltage perturbations and load disturbances. A linear combination of inductor current and capacitor voltage errors with respect to their corresponding equilibrium values is analysed as a switching surface. A linear matrix inequalities (LMI)‐based analysis to obtain optimum coefficients of the linear combination reveals that the best compromise between inrush current and output response rapidity is the current control given by the switching surface S ( x ) = i L − I E , where I E is the current coordinate of the equilibrium point. This surface is proposed for start‐up and for rejecting input voltage perturbations, because it is demonstrated that the current control is inherently insensitive to input voltage variations. Output voltage regulation in front of load perturbations or input voltage variations is achieved once the converter is in a steady state by modifying S ( x ) with the insertion of a PI‐correcting network. The resulting controller is implemented analogically and employs two switching surfaces, that is, one surface for start‐up and another one for output voltage regulation. The theoretical predictions are verified by means of simulation and experimental results.