大功率LED片式COB光源应用

发布时间：2018-09-02 05:56

【摘要】：目前大功率LED正处于大力推广应用阶段,为解决目前大功率LED光源在应用过程中普遍存在的散热不良、照明灯具设计复杂等问题,针对本课题组所自主研发一种新型大功率片式COB光源应用相关技术进行研究,主要完成了以下工作:首先,从大功率片式COB光源的封装结构入手,对片式COB光源的整个封装制造流程进行研究,确保所封装出的光源具有较好的光品质,特别对封装过程中的荧光粉的状态对片式COB光源的整体光色指标的影响及变化规律进行了探讨。其次,对大功率片式COB光源本身的散热性能进行研究,揭示出目前COB光源普遍存在热集中问题,对片式COB光源的温度场分布特点进行研究。针对片式COB光源的自身特点,提出了夹持式的散热方案,利用正交实验法研究了散热器的翅片厚度、翅片间距、翅片长度、翅片高度、翅片片数、基底厚度这六个参数对片式COB光源的结温和成本的影响规律,利用极差分析法,得出各因素对片式COB光源结温和成本的影响程度大小。提出线型加权模型,综合考虑片式光源结温和成本的影响,优化出了15W大功率片式COB光源模组的最佳散热器形状尺寸。针对COB光源普遍存在的热集中现象,提出了在散热器基底中央部位加装导热筋的解决办法。并且利用“烟囱效应”对所优化的散热器结构进一步改进,提出合理设置空气对流通道,增强散热器自然对流强度的方法。再次,针对大功率片式COB光源的二次光学设计问题进行深入研究,利用边缘光线法,分别设计了实现均匀圆形光斑和均匀矩形光斑的自由曲面透镜。在设计片式COB光源的均匀圆形光斑和均匀矩形光斑的自由曲面透镜时,先按照点光源的的设计方法设计一个基本的自由曲面透镜雏形,然后将其用于片式COB光源,根据实际模拟结果,通过修改目标平面的面积单元的网格划分多次修正每个网格的面积,来优化出适合于片式COB光源的自由曲面透镜透镜。最后,基于大功率片式COB光源的封装、散热和光学方面的研究成果,设计了一款应用于道路照明的LED路灯,和一款应用于装饰照明、商业照明的LED射灯,并制作了相应的样灯,对其光、热性能进行了测量。并参照《城市道路照明标准》,应用所设计LED路灯,设计了一条双向四车道宽14米的城市道路的均匀照明的解决方案。
[Abstract]:At present, high power LED is in the stage of popularization and application. In order to solve the problems such as poor heat dissipation and complicated design of lighting lamps and so on, the current high power LED light source is widely used in the process of application. A new type of high power COB light source is researched and developed by our research group. The main work is as follows: firstly, the encapsulation structure of high power chip COB light source is introduced. The whole package manufacturing process of chip COB light source is studied to ensure that the packaged light source has better light quality. In particular, the influence of the state of phosphors in packaging process on the overall light color index of COB laminated light source and its variation rule are discussed. Secondly, the heat dissipation performance of high power COB light source is studied, which reveals that there is a general problem of heat concentration in COB light source at present, and the characteristics of temperature field distribution of COB light source are studied. According to the characteristics of the laminated COB light source, a heat dissipation scheme is proposed. The fin thickness, fin spacing, fin length, fin height, fin number of the radiator are studied by orthogonal experiment. The influence of the six parameters of substrate thickness on the junction temperature cost of the lamellar COB light source is studied. By using the range analysis method, the degree of influence of each factor on the junction temperature cost of the chip COB light source is obtained. A linear weighted model is proposed to optimize the optimal radiator size of 15W high power COB light source module considering the effect of chip light source junction and cost. Aiming at the phenomenon of heat concentration in COB light source, the solution of adding heat conduction bars to the central part of radiator substrate is put forward. Using the "chimney effect" to further improve the structure of the optimized radiator, the method of reasonably setting up the air convection channel to enhance the natural convection intensity of the radiator is put forward. Thirdly, the secondary optical design of high power chip COB light source is studied in depth. Using the edge ray method, a free-form lens is designed to realize the uniform circular spot and the uniform rectangular spot, respectively. In designing the free-form lens of uniform circular spot and uniform rectangular spot of COB light source, the prototype of a basic free-form curved lens is designed according to the design method of point light source, and then it is used as a COB light source. According to the actual simulation results, the free-form curved lens suitable for the lamellar COB light source is optimized by modifying the mesh division of the area element of the target plane and modifying the area of each mesh several times. Finally, based on the encapsulation, heat dissipation and optical research results of high power chip COB light source, a LED street lamp for road lighting and a LED lamp for decorative lighting and commercial lighting are designed, and the corresponding sample lamps are made. The optical and thermal properties were measured. With reference to the Urban Road Lighting Standard and applying the designed LED street lamp, a solution for uniform lighting of a two-way four-lane 14m wide urban road is designed.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN312.8

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