An embedded system for color point control of LEDs against ambient temperature variations

R. Srividya, Ciji Pearl Kurian, C. R. Srinivasan, R. Sowmya

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Dynamic variation and stabilization of color temperature according to user preferences, using multichip Red-Green-Blue LEDs, is a challenging task. Color point can vary due to variation in junction temperature caused due to self-heating, variation in ambient temperature, and device aging. In this paper, we present a closed-loop system that can tune and control the color points from 2700 to 6500 K from the variations of ambient temperature. Open-loop results obtained using forward voltage technique clearly show the effect of temperature on forward voltage, total flux, tristimulus values, color point, and peak wavelength. The effect of PWM dimming factor on tristimulus values is also studied. Nonuniform decay rates of Red-Green-Blue LEDs demand the design of separate control loops. Thus, a cost-effective hardware-in-loop simulation system with individual color control, compensating the temperature by instantly detecting the diode forward voltage with minimum number of components, is designed and validated.

Original languageEnglish
Title of host publicationInternational Conference on Intelligent Computing and Applications - ICICA 2016
PublisherSpringer Verlag
Pages533-542
Number of pages10
Volume632
ISBN (Print)9789811055195
DOIs
Publication statusPublished - 01-01-2018
Event3rd International Conference on Intelligent Computing and Applications, ICICA 2016 - Akurdi, Pune, India
Duration: 21-12-201622-12-2016

Publication series

NameAdvances in Intelligent Systems and Computing
Volume632
ISSN (Print)2194-5357

Conference

Conference3rd International Conference on Intelligent Computing and Applications, ICICA 2016
CountryIndia
CityAkurdi, Pune
Period21-12-1622-12-16

All Science Journal Classification (ASJC) codes

  • Control and Systems Engineering
  • Computer Science(all)

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