Open AccessParameters selection criteria of proportional–integral controller for a quadratic buck converter
Author(s) -
MoralesSaldaña Jorge Alberto,
LoeraPalomo Rodrigo,
PalaciosHernández Elvia
Publication year - 2014
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.2013.0343
Subject(s) - buck converter , control theory (sociology) , mathematics , selection (genetic algorithm) , quadratic equation , controller (irrigation) , computer science , physics , control (management) , artificial intelligence , thermodynamics , power (physics) , geometry , biology , agronomy
A criteria for selection of parameters of proportional and integral (PI) controller for a DC–DC quadratic buck converter is proposed here. This procedure was developed from a large‐signal model of converter in which a multiloop control scheme is added. This scheme has two control loops: an inner current loop, which improves the dynamic behaviour using a single gain, and a conventional PI controller as outer loop, which provides regulation. For the resulting system, the necessary conditions are derived for the existence of equilibrium point and stability in closed‐loop. In comparison with the traditional method of loopshaping, which uses small‐signal model, analytic expressions are found that simplifies the selection of controller parameters. At the end, the procedure is applied to 28 W quadratic buck regulator prototype and experimental results are given to verify the effectiveness.