干旱区生态环境知识资源中心(Arid): Prediction Of Lumen Output And Chromaticity Shift In Leds Using Kalman Filter And Extended Kalman Filter Based Models.

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报告编号	DE151212870
	Prediction Of Lumen Output And Chromaticity Shift In Leds Using Kalman Filter And Extended Kalman Filter Based Models.
	Lall, P; Wei, J; Davis, J. L.
英文摘要	Abstract— Solid-state lighting (SSL) luminaires containing light emitting diodes (LEDs) have the potential of seeing excessive temperatures when being transported across country or being stored in non-climate controlled warehouses. They are also being used in outdoor applications in desert environments that see little or no humidity but will experience extremely high temperatures during the day. This makes it important to increase our understanding of what effects high temperature exposure for a prolonged period of time will have on the usability and survivability of these devices. Traditional light sources “burn out” at end-of-life. For an incandescent bulb, the lamp life is defined by B50 life. However, the LEDs have no filament to “burn”. The LEDs continually degrade and the light output decreases eventually below useful levels causing failure. Presently, the TM-21 test standard is used to predict the L70 life of LEDs from LM-80 test data. Several failure mechanisms may be active in a LED at a single time causing lumen depreciation. The underlying TM-21 Model may not capture the failure physics in presence of multiple failure mechanisms. Correlation of lumen maintenance with underlying physics of degradation at system-level is needed. In this paper, Kalman Filter (KF) and Extended Kalman Filters (EKF) have been used to develop a 70-percent Lumen Maintenance Life Prediction Model for LEDs used in SSL luminaires. Ten-thousand hour LM-80 test data for various LEDs have been used for model development. System state at each future time has been computed based on the state space at preceding time step, system dynamics matrix, control vector, control matrix, measurement matrix, measured vector, process noise and measurement noise. The future state of the lumen depreciation has been estimated based on a second order Kalman Filter model and a Bayesian Framework. Life prediction of L70 life for the LEDs used in SSL luminaires from KF and EKF based models have been compared with the TM-21 model predictions and experimental data.
英文关键词	Light emitting diodes (LEDs) Service life Kalman filters Failure mechanics Ssl(Solid state lighting)
出版年	2014
语种	英语
国家	United States
来源学科分类	49E - Optoelectronic Devices & Systems ; 46C - Optics & Lasers
URL	http://r.cnki.net/KCMS/detail/detail.aspx?DbCode=KJBG&dbname=KJBGW&filename=5a02ae0b31c97d1c38a834b8
来源机构	Department of Energy General
资源类型	科技报告
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/273960
推荐引用方式 GB/T 7714	Lall, P,Wei, J,Davis, J. L.. Prediction Of Lumen Output And Chromaticity Shift In Leds Using Kalman Filter And Extended Kalman Filter Based Models.,2014.