Proceedings of the International Conference on Computer Information Systems and Industrial Applications

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A Single-Stage Dimmable Multi-String HB-LED Driver with High Power Factor and Temperature Compensation

Authors
Y.H Chiu, Y.H Liu, Y.L. Chen, S.C Wang
Corresponding Author
Y.H Chiu
Available Online June 2015.
DOI
10.2991/cisia-15.2015.263How to use a DOI?
Keywords
PFC; HB-LEDs; SEPIC; DVR
Abstract

This paper proposes a single-stage constant-current driver with power factor correction (PFC) and temperature rise compensation for igniting multi-string high-brightness light-emitting diodes (HB-LEDs) in parallel connection. The devised dimmable LED driver is composed of a coupled inductor single-ended primary inductance converter (SEPIC) with PFC mechanism and k-channel current regulators (CRs) with dimming and temperature compensation capabilities. The LED voltage drop features negative temperature coefficient characteristic and is subject to change depending on the forward current and the thermal resistivity of a given package. By regulating the LED feeding voltage continuously, a dynamic voltage regulation (DVR) control is addressed in this paper to automatically minimize the power dissipation of the CR caused by the voltage drop variation due to the LED junction temperature drift. With low implemented outlay, the studied topology of multi-string LED driver has good power conversion efficiency and low total harmonic distortion (THD). The control mechanisms and design considerations are analyzed and discussed. An 80W laboratory prototype implemented with two low-cost commercial controllers is also built and tested. Experimental results are provided to show the effectiveness and performance of the proposed scheme.

Copyright
© 2015, the Authors. Published by Atlantis Press.
Open Access
This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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Volume Title
Proceedings of the International Conference on Computer Information Systems and Industrial Applications
Series
Advances in Computer Science Research
Publication Date
June 2015
ISBN
10.2991/cisia-15.2015.263
ISSN
2352-538X
DOI
10.2991/cisia-15.2015.263How to use a DOI?
Copyright
© 2015, the Authors. Published by Atlantis Press.
Open Access
This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

Cite this article

risenwbib
TY  - CONF
AU  - Y.H Chiu
AU  - Y.H Liu
AU  - Y.L. Chen
AU  - S.C Wang
PY  - 2015/06
DA  - 2015/06
TI  - A Single-Stage Dimmable Multi-String HB-LED Driver with High Power Factor and Temperature Compensation
BT  - Proceedings of the International Conference on Computer Information Systems and Industrial Applications
PB  - Atlantis Press
SP  - 971
EP  - 975
SN  - 2352-538X
UR  - https://doi.org/10.2991/cisia-15.2015.263
DO  - 10.2991/cisia-15.2015.263
ID  - Chiu2015/06
ER  -