Polychromatic Control Technology of Solid State Lighting
Date Issued
2008
Date
2008
Author(s)
Tang, Chun-en
Abstract
The main purpose of this research is to investigate the control technology of red-green-blue (RGB) light emitting-diode (LED) in order to stabilize luminance and color of lighting. In addition, the well control performance can be provided by knowing of thermal-electric-luminous-chromatic dynamics of RGB LED luminaire.he dynamic model of RGB LED luminaire is a Multi-Input Multi-Output system, and can be divided into three parts as thermal, chromatic and luminous model. Thermal model is derived as fourth-order system, and can be simplified as first-order bi-proper system by using system identification technique. Chromatic and luminous model are zero-th order system due to fast response of photon. The system identification shows that both models are non-linear systems of input power and junction temperature. By knowing the complete thermal-electric-luminous-chromatic model, the control system can thus design by using luminous feedback and junction temperature compensation. In this study, the PI control can satisfy transient specification and reduce luminous steady-state error and color difference. The experimental results showed rise time tr = 0.88s and settling time ts = 2.84s. It also indicated luminous error 0.99％ and color difference Δu′v′= 0.00171 under 15W thermal disturbance. The results prove that the control system can improve RGB LED lighting performance.
Subjects
light emitting-diode
polychromatic lighting
Thermal-electric-luminous- chromatic model
chromatic and luminous control
system identification
junction temperature measurement
luminaire and lighting design.
Type
thesis
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