【摘要】：目前大功率LED正處于大力推廣應用階段,為解決目前大功率LED光源在應用過程中普遍存在的散熱不良、照明燈具設(shè)計復雜等問題,針對本課題組所自主研發(fā)一種新型大功率片式COB光源應用相關(guān)技術(shù)進行研究,主要完成了以下工作:首先,從大功率片式COB光源的封裝結(jié)構(gòu)入手,對片式COB光源的整個封裝制造流程進行研究,確保所封裝出的光源具有較好的光品質(zhì),特別對封裝過程中的熒光粉的狀態(tài)對片式COB光源的整體光色指標的影響及變化規(guī)律進行了探討。其次,對大功率片式COB光源本身的散熱性能進行研究,揭示出目前COB光源普遍存在熱集中問題,對片式COB光源的溫度場分布特點進行研究。針對片式COB光源的自身特點,提出了夾持式的散熱方案,利用正交實驗法研究了散熱器的翅片厚度、翅片間距、翅片長度、翅片高度、翅片片數(shù)、基底厚度這六個參數(shù)對片式COB光源的結(jié)溫和成本的影響規(guī)律,利用極差分析法,得出各因素對片式COB光源結(jié)溫和成本的影響程度大小。提出線型加權(quán)模型,綜合考慮片式光源結(jié)溫和成本的影響,優(yōu)化出了15W大功率片式COB光源模組的最佳散熱器形狀尺寸。針對COB光源普遍存在的熱集中現(xiàn)象,提出了在散熱器基底中央部位加裝導熱筋的解決辦法。并且利用“煙囪效應”對所優(yōu)化的散熱器結(jié)構(gòu)進一步改進,提出合理設(shè)置空氣對流通道,增強散熱器自然對流強度的方法。再次,針對大功率片式COB光源的二次光學設(shè)計問題進行深入研究,利用邊緣光線法,分別設(shè)計了實現(xiàn)均勻圓形光斑和均勻矩形光斑的自由曲面透鏡。在設(shè)計片式COB光源的均勻圓形光斑和均勻矩形光斑的自由曲面透鏡時,先按照點光源的的設(shè)計方法設(shè)計一個基本的自由曲面透鏡雛形,然后將其用于片式COB光源,根據(jù)實際模擬結(jié)果,通過修改目標平面的面積單元的網(wǎng)格劃分多次修正每個網(wǎng)格的面積,來優(yōu)化出適合于片式COB光源的自由曲面透鏡透鏡。最后,基于大功率片式COB光源的封裝、散熱和光學方面的研究成果,設(shè)計了一款應用于道路照明的LED路燈,和一款應用于裝飾照明、商業(yè)照明的LED射燈,并制作了相應的樣燈,對其光、熱性能進行了測量。并參照《城市道路照明標準》,應用所設(shè)計LED路燈,設(shè)計了一條雙向四車道寬14米的城市道路的均勻照明的解決方案。
[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.
【學位授予單位】：華中科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN312.8

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