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The establishment of reliability model for led lamps

Journal of Semiconductors 2016年第7期37卷 92-97页

作者：郝剑荆雷王尧高群客洪亮王潇洵张艳超孙强续志军 Opto-Electronics Technology Center Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China University of Chinese Academy of Science Beijing 100049China

In order to verify which of the distributions and established methods of reliability model are more suitable for the analysis of the accelerated aging of led lamp, three established methods （approximate method, analytical method and two-stage method） of reliability model are used to analyze the experimental data under the condition of the Weibull distribution and Lognormal distribution, in this paper. Ten led lamps are selected for the accelerated aging experiment and the luminous fluxes are measured at an accelerated aging temperature. AIC information criterion is adopted in the evaluation of the models. The results show that the accuracies of the analytical method and the two-stage method are higher than that of the approximation method, with the widths of confidence intervals of unknown parameters of the reliability model being the smallest for the two-stage method. In a comparison between the two types of distributions, the accuracies are nearly identical.

关键词： accelerator led lamps approximate method analytical method two-stage method AIC

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Secondary Lens Optimization for led lamps

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Journal of Mechanics Engineering and Automation 2014年第1期4卷 46-51页

作者： Jose Luiz Ferraz Barbosa Wesley Pacheco Calixto Leonardo da Cunha Brito Electrical Mechanical & Computer Engineering School Federal University of Goias Nucleus of Experimental and Technological Studies Federal Institute of Goias Electrical Engineering Department University of Brasilia

The purpose of this paper is to present a methodology for optimizing the geometry of the led （light emitting diode） secondary lens. The research objective is to uniform the illumination distribution on a target plane for nonimaging application. In order to achieve this, a software that simulates ray tracing is used, in conjunction with a heuristic process for enhancing the optimized parameters that form the geometry of the led secondary lens. Spherical lenses was opted for optimization due to its lower manufacture complexity.

关键词： led lamps genetic algorithm lens optimization.

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