Design of an LFR based on a SEPIC converter under sliding mode control for HBLEDs applications

Author

Bodetto, M. ; Cid-Pastor, A. ; Martìnez-Salamero, L. ; El Aroudi, A.

Author_Institution

Dept. d´´Eng. Electron., Electr. i Autom. (DEEEA), Univ. Rovira i Virgili, Tarragona, Spain

fYear

2011

fDate

15-18 May 2011

Firstpage

2901

Lastpage

2904

Abstract

In this paper a SEPIC converter, operating as an AC-DC adaptation stage, is studied. It is shown that the system has high efficiency and good power factor being able to work both as a boost (step-up) or buck (step-down) converter. To impose a loss free resistor (LFR) behavior, sliding-mode control is applied. It is shown that the LFR acts as an ideal rectifier with a power factor near the unity. The output of the system is used to power supply a group of HBLEDs, and its brightness (luminosity) is controlled by the output current. The design and the models are validated by mathematical, numerical and experimental results.

Keywords

AC-DC power convertors; light emitting diodes; power factor; rectifying circuits; resistors; variable structure systems; AC-DC adaptation stage; HBLED; LFR; SEPIC converter; boost converter; buck converter; high-brightness LED; loss free resistor; luminosity; power factor; rectifier; sliding mode control; Mathematical model; Power supplies; Reactive power; Resistors; Sliding mode control; Strontium; Switches;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems (ISCAS), 2011 IEEE International Symposium on

Conference_Location

Rio de Janeiro

ISSN

0271-4302

Print_ISBN

978-1-4244-9473-6

Electronic_ISBN

0271-4302

Type

conf

DOI

10.1109/ISCAS.2011.5938238

Filename

5938238