Light & Engineering 25 (4)

Volume 27
Date of publication 12/20/2017
Pages 99-108

PDF

Development of CCT Tunable LED Lighting System Using Red-Blue-White LED. L&E 25 (4) 2017

Articles authors:

Rajib Malik, Saswati Mazumdar

Ph.D. fellow at Electrical Engineering Department of Jadavpur University. He received his M.E. degree in Illumination Engineering in 2013 and B.E. degree in Applied Electronics & Instrumentation Engineering in 2010. His research interests include Solar based Smart Lighting system, electronics converters for lighting application and colour control of light

Saswati Mazumdar, Ph. D, Professor.of Electrical Engineering, Jadavpur University (JU), Kolkata, India. She has 36 years of experience in Lighting Research and Teaching. Developed a modernized Illumination Engineering laboratory in Electrical Engineering Department, Jadavpur University. Have founded two Masters’ Courses on Illumination Engineering (Daytime) and Illumination Technology & Design (Evening) in JU. Executed many R&D and Consultancy Projects on Illumination and allied fields

Abstract:

This study proposed a CCT tunable LED lighting system, which comprises of Red-Blue-White (RBW) LED luminaire, LED driver and Dimming-controller-unit (DCU). Here, ? rst RGB LED at di? erent intensity was blended with Warm-White (WW) LEDs to produce variable CCT. To achieve higher CCT than WW colour, it was found that only blue LED blended with WW LEDs is su? cient. On the other hand, for lower CCT range, red LED mixed with WW LEDs is enough. This new algorithm is capable to produce CCT ranging from 2700K to 9723K. Measured maximum deviation from set point value was found 18K for Red LEDs and 344 K for Blue LEDs blending respectively. The LED driver is designed to operate in voltage protection mode and in current control mode for a typical dimming cycle. The current control mode is implemented using an op-amp based PI (proportion-integral) controller.

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