LED驱动电源可靠性研究与灯具寿命评估

发布时间：2019-06-29 15:26

【摘要】：LED光源具有光效高、使用寿命长、无频闪、节能等优点,目前正逐渐取代传统照明灯具,因此针对LED灯具中驱动电源的研究已成为电力电子行业研究的热门课题。LED驱动电源的可靠性决定了LED灯具的品质和使用寿命的。所以提高LED驱动电源的可靠性具有重要意义。LED灯具作为第四代照明光源,其实际寿命值与理论值差距非常大,同时存在LED灯具检测标准与检测体系不完善的问题,缺乏比较较专业的检测手段和科学的评价方法,所以,需要建立一个快速有效的寿命评定方法。针对LED照明灯具中的驱动电源的可靠性进行研究,其中主要包括驱动电源中主要元器件的温升,驱动电源温升的改进调整,利用Saber软件仿真分析,分析电子元器件对驱动电源输出参数的影响权重。可对驱动电源故障进行排查。本文采用双加速寿命试验方法,提出了一种快速评价寿命的方法,结合试验所得数据,对数据进行整理。提出一种较合理的数理统计分析方法。本文主要内容有以下几个方面:(1)针对LED灯具样品,提出以湿度和温度应力同时作为试验的加速应力,以光通量衰减为初始光通量的70%作为失效判据进行检测,有效缩短了试验时间;(2)对LED灯具照明驱动电源进行了可靠性的分析,建立了驱动电源的3D模型图,用仿真软件对其进行有限元分析;用热电偶测温方法对驱动电源中电子元器件温升进行实际测量,对仿真结果进行验证,并且针对测量数据进行分析,继而提出降低驱动电源温升方法;可提高LED驱动电源的可靠性。(3)通过试验得出两种不同应力水平下的光通量试验数据,同时以威布尔分布来描述试验样品的寿命分布,运用最小二乘法和阿伦尼斯模型对试验数据进行统计分析,最后推导出正常应力水平下灯具的寿命。(4)对试验中存在的问题及试验结果的不确定性进行了分析,为今后LED灯具寿命评估提供了合理的方案和可靠的数据支持。
[Abstract]:Led light source has many advantages, such as high light efficiency, long service life, no stroboscopic, energy saving and so on. At present, it is gradually replacing the traditional lighting lamps and lanterns, so the research on driving power supply in LED lamps has become a hot topic in power electronics industry. The reliability of LED driving power supply determines the quality and service life of LED lamps and lanterns. Therefore, it is of great significance to improve the reliability of LED driving power supply. Led lamps and lanterns, as the fourth generation lighting light source, have a very large gap between the actual life value and the theoretical value. At the same time, there are some problems such as imperfect detection standards and detection system for LED lamps and lanterns, and lack of more professional detection methods and scientific evaluation methods. Therefore, it is necessary to establish a fast and effective life evaluation method. The reliability of driving power supply in LED lighting lamps is studied, including the temperature rise of the main components in the driving power supply, the improvement and adjustment of the temperature rise of the driving power supply, and the influence weight of electronic components on the output parameters of the driving power supply is analyzed by using Saber software simulation analysis. The fault of driving power supply can be checked. In this paper, a rapid life evaluation method is proposed by using the double accelerated life test method, and the data are sorted out according to the test data. A more reasonable mathematical statistical analysis method is put forward. The main contents of this paper are as follows: (1) for LED lamps and lanterns, the humidity and temperature stresses are used as the accelerated stress of the test at the same time, and the luminous flux attenuation is used as the failure criterion to detect 70% of the initial luminous flux, which effectively shortens the test time; (2) the reliability of LED lighting driving power supply is analyzed, the 3D model diagram of driving power supply is established, and the finite element analysis is carried out with simulation software, the temperature rise of electronic components in driving power supply is measured by thermocouple temperature measurement method, the simulation results are verified, and the measurement data are analyzed, and then the method of reducing the temperature rise of driving power supply is put forward. The reliability of LED driving power supply can be improved. (3) the luminous flux test data under two different stress levels are obtained by experiments, and the life distribution of the test samples is described by Weibull distribution. The test data are statistically analyzed by the least square method and the Arennis model. Finally, the life of lamps and lanterns under normal stress level is deduced. (4) the problems existing in the test and the uncertainty of the test results are analyzed, which provides a reasonable scheme and reliable data support for the life evaluation of LED lamps and lanterns in the future.
【学位授予单位】：厦门理工学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM923.34

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