A stochastic process based reliability prediction method for LED driver

Journal article (2018)

Authors

B Sun Guangdong University of Technology
Xuejun Fan Lamar University
W.D. van Driel Philips Lighting Research, Electronic Components, Technology and Materials - EEMCS
Chengqiang Cui Guangdong University of Technology
Kouchi Zhang Electronic Components, Technology and Materials - EEMCS
Research Group
Electronic Components, Technology and Materials (EEMCS) (TU Delft)
Copyright: © 2018 Bo Sun, Xuejun Fan, W.D. van Driel, Chengqiang Cui, Kouchi Zhang
DOI
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https://doi.org/10.1016/j.ress.2018.06.001
LED driver Stochastic process LED lamp Lumen depreciation Reliability prediction
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Published Date

2018

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Electronic Components, Technology and Materials

Abstract

In this study, we present a general methodology that combines the reliability theory with physics of failure for reliability prediction of an LED driver. More specifically, an integrated LED lamp, which includes an LED light source with statistical distribution of luminous flux, and a driver with a few critical components, is considered. The Wiener process is introduced to describe the randomness of lumen depreciation. The driver's survival probability is described using a general Markov Chain method. The system compact thermal model (physics of failure model) is developed to couple with the reliability methods used. Two scenarios are studied: Scenario S1 considers constant driver's operation temperature, while Scenario S2 considers driver's temperature rise due to lumen depreciation. It has been found that the wide life distribution of LEDs will lead to a large range of the driver's survival probability. The proposed analysis provides a general approach for an electronic system to integrate the reliability method with physics models.