Development of constant-power driving control for light-emitting-diode (LED) luminaire

Bin-Juine Huang, Chun-Wei Chen, Chin-Dian Ong, Bo-Han Du, Po-Chien Hsu

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

The illumination of an LED may be affected by operating temperature even under constant-current condition. A constant-power driving technique is proposed in the present study for LED luminaire. A linear system dynamics model of LED luminaire is first derived and used in the design of the feedback control system. The PI controller was designed and tuned taking into account the control accuracy and robust properties with respect to plant uncertainty and variation of operating conditions. The control system was implemented on a microprocessor and used to control a 150W LED luminaire. The test result shows that the feedback system accurately controls the input power of LED luminaire to within 1.3 per cent error. As the ambient temperature changes from 0 to 40 °C, the LED illumination varies slightly (-1.7%) for constant-power driving, as compared to that of constant-current driving (-12%) and constant-voltage driving (+50%). The constant-power driving has revealed advantage in stabilizing the illumination of LED under large temperature variation. © 2012 Elsevier Ltd. All rights reserved.
Original languageEnglish (US)
Pages (from-to)645-651
Number of pages7
JournalApplied Thermal Engineering
Volume50
Issue number1
DOIs
StatePublished - Jan 2013
Externally publishedYes

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