大功率LED筒灯散热及二次光学设计

发布时间：2018-04-29 15:29

本文选题：LED + 散热　；参考：《华南理工大学》2015年硕士论文

【摘要】：随着发光效率的提高和单位成本的降低,半导体发光芯片(LED)应用逐渐由传统的小功率(指示灯、背景灯等)发展到大功率应用场合(工矿灯、路灯等)。散热和二次光学设计是大功率LED照明开发的两大关键技术和核心,对整灯的光效、光品质和使用寿命等起着决定性的影响。因此,本文针对大功率LED筒灯,开展了系统的散热和二次光学设计研究。散热控制方面,首先利用FloEFD仿真软件构建了大功率LED筒灯模型,通过分析,对比研究了四种不同散热方案的散热性能,结果表明:具有烟囱强化对流效应的筒状散热器结构方案散热性能最优。通过正交试验法对选定模型的筒壁厚度、导热基板厚度和翅片数等三个因素进行评价。其次构建测试平台,通过对样品的实际测试,对比模拟分析数据,验证模型及优化方案的准确性,并对比散热器表面是否涂敷高辐射性能涂料对散热能力的影响。最后通过模拟,对具有烟囱强化对流结构结构的筒状散热器进行方向性影响分析,研究流体温度、速度和轨迹等参数变化。二次光学设计方面,首先提出基于曲面特性的小角度TIR(Total Internal Reflection)透镜设计方法,即适当设计指定光线从透镜的一个表面到另一表面的光路分布,再以此分别迭代计算透镜的各个表面,以此方法设计一款小角度配光的TIR透镜。结果表明,所设计的小角度配光透镜配光角度为6°,照度均匀性达到97%,能量利用率为85%。该设计方法能够快速得到透镜的曲面形状参数,适合于小角度配光透镜的设计。其次对大功率LED筒灯的进行二次光学设计。采用软件优化法,根据目标配光曲线和对比传统的反射器方案,通过分析和优化模型,设计一款新型的反射器,配光角度为80°,能够有效解决光斑和眩光等问题,并对设计的大功率LED筒灯进行照明模拟以指导实际应用。
[Abstract]:With the improvement of luminescence efficiency and the decrease of unit cost, the application of semiconductor light-emitting chip LED has gradually developed from traditional low-power (indicator lamp, background lamp, etc.) to high-power applications (industrial lamp, street lamp, etc.). Heat dissipation and secondary optical design are the two key technologies and cores in the development of high power LED lighting, which play a decisive role in the light efficiency, light quality and service life of the whole lamp. Therefore, the heat dissipation and secondary optical design of high power LED downlight are studied in this paper. In the aspect of heat dissipation control, the high power LED downlight model is constructed by using FloEFD simulation software. Through analysis, the heat dissipation performance of four different heat dissipation schemes is compared and studied. The results show that the heat dissipation performance of the tubular radiator with enhanced convection effect of chimney is optimal. The thickness of cylinder wall, the thickness of heat conduction substrate and the number of fins were evaluated by orthogonal test. Secondly, the test platform is constructed, and the accuracy of the model and optimization scheme is verified by comparing the data of simulation analysis with the actual test of the sample, and the influence of whether the radiator surface is coated with high radiation performance coating on the heat dissipation ability is compared. Finally, through simulation, the directional effect of the tubular radiator with chimney reinforced convection structure is analyzed, and the variation of fluid temperature, velocity and trajectory is studied. In the aspect of quadratic optical design, a design method of small angle TIR(Total Internal reflection) lens based on the surface characteristics is proposed, that is, the light path distribution from one surface to the other surface of the lens is properly designed. Then each surface of the lens is calculated iteratively, and a small angle TIR lens is designed. The results show that the light distribution angle of the small angle distribution lens is 6 掳, the uniformity of illumination is 97 掳, and the energy utilization ratio is 85%. This design method can get the shape parameters of the lens quickly, and it is suitable for the design of the light distribution lens with small angle. Secondly, the secondary optical design of high power LED downlight is carried out. Using software optimization method, according to the target light distribution curve and comparing with the traditional reflector scheme, a new type of reflector is designed by analyzing and optimizing the model. The light distribution angle is 80 掳, which can effectively solve the problems of spot and glare, etc. The design of high-power LED downlight lighting simulation to guide the practical application.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM923.34

【引证文献】