TY - GEN
T1 - An embedded system for color point control of LEDs against ambient temperature variations
AU - Srividya, R.
AU - Kurian, Ciji Pearl
AU - Srinivasan, C. R.
AU - Sowmya, R.
N1 - Publisher Copyright:
© Springer Nature Singapore Pte Ltd. 2018.
PY - 2018/1/1
Y1 - 2018/1/1
N2 - 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.
AB - 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.
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U2 - 10.1007/978-981-10-5520-1_48
DO - 10.1007/978-981-10-5520-1_48
M3 - Conference contribution
AN - SCOPUS:85040224766
SN - 9789811055195
VL - 632
T3 - Advances in Intelligent Systems and Computing
SP - 533
EP - 542
BT - International Conference on Intelligent Computing and Applications - ICICA 2016
A2 - Das, Swagatam
A2 - Dash, Subhransu Sekhar
A2 - Panigrahi, Bijaya Ketan
PB - Springer Verlag
T2 - 3rd International Conference on Intelligent Computing and Applications, ICICA 2016
Y2 - 21 December 2016 through 22 December 2016
ER -