共查询到20条相似文献,搜索用时 156 毫秒
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LED球灯泡已逐渐出现在我们的日常生活中,无论在大街小巷,还是在人们的生活区域,现在都已经见到它们的身影。在普遍使用的过程中,其LED球灯泡的安全要求与人们的生命财产有着重要的关系,而在LED球泡灯的应用领域中优化其设计的方案,是推广LED球泡灯的重要方式。 相似文献
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新一代大功率白光LED光源具有很多优点,如节能、环保、寿命长等,但大功率LED的散热也是一个至关重要的问题。如果LED散热问题解决不好,LED灯具工作一段时间后就会输出光功率减小,芯片加速老化,工作寿命缩短。文章从LED散热问题着手,详细介绍了目前广泛商用的大功率LED器件结构及导热途径、所用散热片的特点,以及LED所用的散热片设计和模拟方法。 相似文献
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阐述一种基于单片机STC12C5A60S2自动测控LED节能照明系统的设计方案。该系统能够对LED灯的亮度进行自动调控,环境光强减弱时单片机自动提高LED的发光强度,环境光强变强时大年纪自动减弱LED灯的发光强度,因此达到减少能源消耗,实现环保功能。此外,本系统还具有光强、温度、红外等传感器来实现LED灯的开关,通过前置的过压、过流保护电路,保证电路系统正常工作和节能效率。LCD液晶显示电路输出外界的当前参数值,因此更加人性化,实现人机交互。该系统在很多基础设施有广阔的应用。 相似文献
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土建冷库建筑设计要点 总被引:1,自引:0,他引:1
冷库建筑物长期处于低温、高湿环境下工作。这一特点要求冷库建筑设计应采取一些特殊的措施。本文重点介始土建冷库建筑设计、结构设计、隔热、防潮隔汽设计、地坪防冻,“冷桥”处理方面应重视的问题。 相似文献
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针对LED照明杂散光的形成原因和处理方法,以及LED照明系统散热问题的产生和结温对灯具寿命和发光率的影响,完善LED照明灯具的设计,利用照明灯具的特点,以目前LED照明灯具采用的散热方式和杂散光的处理形式为基准,采用对比测试的方法对灯具样品进行检验测试。通过对检测结果的分析,解决了LED照明的散热设计中涉及到的关键问题。 相似文献
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LED照明产品设计研究 总被引:1,自引:1,他引:0
在现代照明领域, LED被称为第4代光源.由于LED技术特性和设计特点自成一格,具有鲜明特色和品质,因此被业内专家预测将是取代白炽灯、荧光灯等传统灯具的最具有竞争力的新型照明产品.对LED照明产品的设计研究,必将对灯具照明产品的可持续发展以及设计创新将产生积极影响和重要的应用推广价值. 相似文献
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Light-emitting diode (LED) street lamps rely heavily on successful thermal management, which strongly affects the optical extraction and the reliability/durability of the LED lamp. A thermal analysis of an 80 W LED street lamp was done. Sixteen thermocouples were used to measure the temperatures at 16 different positions of the street lamp. The results demonstrated that the temperature of the frame and the heat sink of the 80 W LED street lamp remained stable at about 42degC after several hours of lighting at a room temperature of 11degC, and the bulk material resistance of the heat sink could be neglected. Numerical simulation was also used to analyse the temperature distribution of the lamp. The reliability of the numerical model was proven by a comparison of simulation results with the experimental data. Through simulations and the corresponding analyses it was found that the tested 80 W LED street lamp would have poor reliability at an environment temperature of 45degC. 相似文献
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Light emitting diodes (LEDs) are now widely used in many fields including traffic lights, vehicle backlights and liquid crystal display (LCD) displays because of their long life, good illumination efficiency and low energy consumption. At present, LEDs are increasingly replacing the traditional lighting and are being used in general illumination such as the street lamp. For the high-power LED street lamps, good light extraction is the most important thing, but low junction temperature of the LED modules is also critical for achieving a long lifetime and a high optical efficiency. Actually, there have been many reports about early failures of street lamps, called dead lamps that have been regarded as a barrier in the public and administration acceptance of LED street lamps. Therefore temperature estimation is always a crucial issue for LED product development. A multi-chip spreading thermal resistance model was applied to estimate the temperature distribution of LED street lamp. The experiment was first done to obtain temperatures of several locations in a prototype LED street lamp. Then the multi-chip spreading resistance model was established to calculate the full temperature distribution. Comparison between the model calculation and experimental measurement showed a good agreement, which demonstrates that the present model can be used in engineering design to estimate the temperature distribution of high-power LED street lamps. 相似文献
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作为新兴的照明技术,LED照明被誉为"21世纪的绿色照明",是一种非常有效的节能和环保手段.着重探讨在工业设计领域,如何在包括路面照明灯具和景观照明灯具的LED室外灯具开发中融入绿色、节能、环保的概念,以及如何提升LED室外灯具形态与实用性方面的价值. 相似文献
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J. K. Sari M. J. Newby A. C. Brombacher L. C. Tang 《Quality and Reliability Engineering International》2009,25(8):1067-1084
Light‐emitting diode (LED) lamp has received great attention as a potential replacement for the more commercially available lighting technology, such as incandescence and fluorescence lamps. LED which is the main component of LED lamp has a very long lifetime. This means that no or very few failures are expected during LED lamp testing. Therefore, degradation testing and modelling are needed. Because the complexity of modern lighting system is increasing, it is possible that more than one degradation failures dominate the system reliability. If degradation paths of the system's performance characteristics (PCs) tend to be comonotone there is a likely dependence between the PCs because of the system's common usage history. In this paper, a bivariate constant stress degradation data model is proposed. The model accommodates assumptions of dependency between PCs and allows the use of different marginal degradation distribution functions. Consequently, a better system reliability estimation can be expected from this model than from a model with independent PCs assumption. The proposed model is applied to an actual LED lamps experiment data. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
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LED照明产品的广泛应用和技术的迅猛发展,给LED照明产业标准化研究带来了新的机遇与挑战。本文从技术要求(包括:光通量维持率及寿命、初始光效、显色性)和测试方法(光衰测试方法)的角度对2008~2010年间我国发布的一些代表性国家、行业和地方道路照明用LED灯具标准进行了对比分析,得出如下结论:1)我国各地道路照明用LED灯具标准存在显著差异,急需统一的道路照明用LED灯具标准来有效规范整个行业的发展;2)LED照明技术的不断革新和进步推动着LED照明相关标准的不断更新和改进,已经有并即将有更多符合产业发展要求的标准被逐步推出。可以预见的是,道路照明用LED灯具标准将朝着统一规范化、细致化、全面化的方向发展。鉴于我国道路照明用LED灯具市场的特殊情况,该项标准的制定甚至可能优先于国际标准。 相似文献
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LED智能照明产品创新设计应用研究 总被引:1,自引:1,他引:1
目的以LED照明产品的信息可视化、智能化为核心创新目标,以集成化、模块化为原则,聚焦于现代家居环境中具有安防功能的LED照明类产品的集成化整合研究。方法对现有家居照明产品及用户需求进行市场和用户调研,确定目标消费群并研究其生活方式、照明需求以及消费习惯,为确定设计方向、产品风格、产品功能提供依据;然后设计出能满足技术要求的LED照明产品;最后运用"信息可视化"手段为用户提供优良的交互体验。结论将打造出具有家居安防功能、信息可视化、远程控制及智能交互新体验的创新产品。 相似文献