RPG Seminar – Precise Luminous Flux and Color Control of Dimmable Red-Green-Blue LED system
Date:
01 Apr, 2021 (Thu)
Time:
10:30 am
Webinar Link:
https://hku.zoom.us/j/98565046488?pwd=YmxFOXpodEJxQzU3VFNDWEdrWWtSQT09

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Speaker

Miss Germaine Cheuk Ping WONG
Department of Electrical and Electronic Engineering
The University of Hong Kong

Abstract

A generic red, green, blue (RGB) LED system involves complex interactions of power, heat, light, and color, which pose a major challenge for achieving precise control over luminance and color-mixing in high-quality lighting applications. In this work, new nonlinear empirical models of a practical RGB LED system with closed-loop control are formulated. The proposed models enable precise prediction of luminous flux and color coordinates by using the three distinct reference voltages as the control variables for independent current regulation across the red, green and blue LED strings. The results are experimentally verified by using a hardware prototype of a DC-DC single-inductor three-output (SITO) LED driver with proportional-integral (PI) compensators and time-interleaving control scheme. The measured values of luminous flux and color coordinates agree closely with the predicted values from the models.

 

Zoom Link (during COVID-19 special period):
https://hku.zoom.us/j/98565046488?pwd=YmxFOXpodEJxQzU3VFNDWEdrWWtSQT09

Meeting ID:985 6504 6488
Password:668823



Biography of the speaker:
Germaine Wong received her Bachelor of Engineering in Computer Engineering from Hong Kong University of Science and Technology. She is currently working toward the M.Phil. degree at The University of Hong Kong. Her research interest is power electronics and LED system optimization.


Organizer

Prof. S.C. TAN
Dr. Albert LEE

Most seminars are open to the general public, free of charge, unless otherwise stated. Registration is not required. Arrangement for car parking facilities on campus please contact us for details.

For enquiries, please contact:
Department of Electrical and Electronic Engineering,
Room 601, Chow Yei Ching Building,
Pokfulam Road, Hong Kong
Tel: (852) 3917 7093
Email: seminar@eee.hku.hk