Color control system for RGB LED light sources using junction temperature measurement

Xiaohui Qu, Siu Chung Wong, Chi Kong Tse

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

48 Citations (Scopus)

Abstract

The efficiency of LED lights is approaching that of fluorescent lamps. LED light sources are finding more applications than conventional light bulbs due to their compactness, lower heat dissipation, and most importantly, real-time color changing capability. Accurate control of colors for RGB LED lights is a challenging task, which includes optical color mixing, color light intensity control and color point maintenance due to LED junction temperature change and device aging. In this paper , we present a LED junction temperature measurement technique for a pulse width modulation (PWM) diode forward current controlled RGB LED lighting system. The technique can control the color effectively without the need for using expensive feedback systems involving light sensors. Performance of chromaticity and luminance stability for a temperature compensated RGB LED system will be presented.
Original languageEnglish
Title of host publicationProceedings of the 33rd Annual Conference of the IEEE Industrial Electronics Society, IECON
Pages1363-1368
Number of pages6
DOIs
Publication statusPublished - 1 Dec 2007
Event33rd Annual Conference of the IEEE Industrial Electronics Society, IECON - Taipei, Taiwan
Duration: 5 Nov 20078 Nov 2007

Conference

Conference33rd Annual Conference of the IEEE Industrial Electronics Society, IECON
CountryTaiwan
CityTaipei
Period5/11/078/11/07

Keywords

  • Color control
  • LED lighting
  • RGB LED
  • Temperature compensation

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering

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