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The purpose of the present study is to design a current control system which is robust to the system dynamics uncertainty and the disturbance of ambient temperature to assure a stable optical output property of LED. The system dynamics model of the LED lighting system was first derived. A 96W high-power LED luminaire was designed and built in the present study. The linearly perturbed system dynamics...
Optical properties of LEDs are sensitive to junction temperature. The understanding of system dynamic behavior is quite important in the controller design of LED. From the principle of solid-state lighting, the luminance of LED is induced from two physical mechanisms: energy effect and optoelectronic effect. The system dynamics model of a high- power LED fixture for energy effect is derived and identified...
Because of advantages such as long lifetime, low power consumption, and no mercury containing, LEDs are widely used in a variety of general-purpose illumination applications. There are two different approaches for generating white light with LEDs. The first one is the combination of phosphors excited by blue or UV LED emission, the other one is mixture of multi-color LEDs Without the power loss in...
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