Nonlinear current observer for backstepping control of buck-type converters

Author

McIntyre, Michael L. ; Mohebbi, Mohammed ; Latham, Joseph

Author_Institution

Electr. & Comput. Eng., Univ. of Louisville, Louisville, KY, USA

fYear

2015

fDate

12-15 July 2015

Firstpage

1

Lastpage

7

Abstract

Two backstepping control schemes are developed for buck-type converters for two different types of loads. The first considers an unknown passive load, while the second considers a time-varying current source load. Both schemes utilize a novel inductor current observer which eliminates the need for a costly current sensor. For the passive load, the output voltage tracking objective is met using only parameter knowledge and the output voltage measurement. For a current source load, the output voltage tracking objective is met using parameter knowledge and measurement of output voltage and load current. A stability analysis and simulation results validate each approach.

Keywords

control nonlinearities; electric current control; electric current measurement; nonlinear control systems; observers; power convertors; stability; time-varying systems; voltage measurement; backstepping control; buck-type converters; inductor current observer; load current measurement; nonlinear current observer; output voltage measurement; output voltage tracking objective; parameter knowledge; passive load; stability analysis; time-varying current source load; Damping; Inductors; Integrated circuit modeling; Load modeling; Mathematical model; Observers; Voltage measurement; backstepping control development; buck converter; observer design;

fLanguage

English

Publisher

ieee

Conference_Titel

Control and Modeling for Power Electronics (COMPEL), 2015 IEEE 16th Workshop on

Conference_Location

Vancouver, BC

Type

conf

DOI

10.1109/COMPEL.2015.7236481

Filename

7236481