本文選題：模擬自然光照明 + LED平板燈��； 參考：《華僑大學(xué)》2016年碩士論文

【摘要】：近年來(lái)隨著LED照明技術(shù)的迅猛發(fā)展,LED照明燈具種類不斷增加,其中平板燈因具有出光均勻、光線柔和等特點(diǎn)得到了廣泛的應(yīng)用。但目前LED平板燈普遍存在以下不足:在成本、效率方面,采用導(dǎo)光板的側(cè)入式平板燈耦合效率低、成本高;采用直下式的平板燈需要燈珠數(shù)量大,生產(chǎn)效率低。在燈光質(zhì)量方面,LED平板燈與現(xiàn)有大多數(shù)LED燈具一樣,普遍存在藍(lán)光溢出、顯色性差等對(duì)人眼有害的缺陷。針對(duì)LED平板燈存在的上述兩個(gè)主要問(wèn)題,本論文研究了一種自然光型LED平板燈,采用無(wú)導(dǎo)光板側(cè)入式結(jié)構(gòu),出光效率高、成本低,燈具出射光光譜接近自然光光譜,顯色性好。論文首先介紹了自然光型LED平板燈的光源設(shè)計(jì)。基于線性光譜疊加理論,自然光型LED平板燈采用5種顏色LED燈珠按一定比例組合作為發(fā)光光源。通過(guò)求解超定方程組的非負(fù)最小二乘解,直接得到匹配目標(biāo)光譜(自然光光譜)的最優(yōu)LED組合比例,然后進(jìn)行光譜合成。采用的燈條包含暖白光、冷白光、青色光、綠色光和紅色光5種LED燈珠,得到五種LED的最優(yōu)個(gè)數(shù)比例為12:3:7:3:11,不同LED燈珠采用周期性交叉排列。實(shí)驗(yàn)測(cè)得組合光源的色溫為4500K、一般顯色指數(shù)Ra達(dá)到92,接近自然光的色溫和顯色指數(shù)。論文接著介紹了特殊結(jié)構(gòu)自由曲面透鏡的設(shè)計(jì)。為了使LED混合光均勻分布在平板燈擴(kuò)散板上,針對(duì)無(wú)導(dǎo)光板側(cè)入式LED平板燈結(jié)構(gòu)特點(diǎn),利用網(wǎng)格劃分法設(shè)計(jì)了一種可以實(shí)現(xiàn)側(cè)方大范圍照明的雙自由曲面透鏡。透鏡內(nèi)曲面用于對(duì)入射光進(jìn)行匯聚,以抑制光線的全反射;外自由曲面用于控制出射光的方向,以實(shí)現(xiàn)均勻照明。仿真結(jié)果顯示:單顆LED發(fā)出的光經(jīng)透鏡折射后可在擴(kuò)散板上形成近似半圓形大范圍照明光斑,出光效率達(dá)到0.93,且當(dāng)單顆光源照明光斑半徑與LED光源的距離比值R/L?4-10時(shí),在300mm?300mm的擴(kuò)散板上的照度均勻性可達(dá)85%以上。論文最后建立了自然光型LED平板燈仿真模型,根據(jù)平板燈的尺寸及各色LED的間距,設(shè)計(jì)了5種不同規(guī)格的透鏡,并分別對(duì)5種LED在擴(kuò)散板上的照明效果進(jìn)行了模擬仿真。仿真結(jié)果顯示:暖白光、冷白光、紅色光、青色光和綠色光LED經(jīng)相應(yīng)透鏡折射后,在360mm?240mm的擴(kuò)散板上的均勻度分別達(dá)到86.2%、88.9%、83.4%、89.3%、85.4%。因此,不同顏色的光能夠在擴(kuò)散板上混色均勻,使平板燈出射光線接近自然光。
[Abstract]:In recent years, with the rapid development of LED lighting technology, the variety of LED lighting lamps has been increasing, among which flat panel lamps have been widely used because of the characteristics of uniform light, soft light and so on. However, at present, the LED flat-panel lamp has the following disadvantages: in cost and efficiency, the side-in flat-panel lamp with light guide plate has low coupling efficiency and high cost, and the use of direct-down flat-panel lamp requires a large number of lamp beads and low production efficiency. In terms of lighting quality, like most existing LED lamps, there are common defects such as blue light overflow, poor color rendering and so on, which are harmful to human eyes. In view of the above two main problems of LED flat panel lamp, this paper studies a kind of natural light type LED flat panel lamp, which adopts the side entry structure of no light guide plate, has high light efficiency, low cost, and the luminaire emission spectrum is close to the natural light spectrum and has good color rendering. Firstly, the light source design of natural light type LED flat lamp is introduced in this paper. Based on the theory of linear spectral superposition, the natural light LED flat-panel lamp uses five kinds of color LED lamp beads to combine as the light source in certain proportion. By solving the nonnegative least square solution of the overdetermined equations, the optimal LED combination ratio of the matching target spectrum (natural light spectrum) is obtained directly, and then the spectral synthesis is carried out. The lamp bars used include five kinds of LED lamp beads: warm white light, cold white light, cyan light, green light and red light. The optimum number ratio of the five LED is 12: 3: 7: 3: 11, and the different LED lamp beads are arranged periodically. The experimental results show that the color temperature of the combined light source is 4500K and the general chromogenic index Ra is 92, which is close to the color temperature and color index of natural light. Then the design of freeform curved lens with special structure is introduced. In order to distribute the mixed light of LED evenly on the diffusion plate of flat panel lamp, according to the structural characteristics of side entry LED flat lamp without light guide, a double free curved lens is designed by using grid division method. The inner surface of the lens is used to converge the incident light to suppress the total reflection of the light, and the outer free surface is used to control the direction of the emitted light to achieve uniform illumination. The simulation results show that the light emitted by a single LED can form a semicircular large range illumination spot on the diffusion plate after refraction of the lens, and the output efficiency is 0.93.The ratio of the radius of the illumination spot to that of the LED light source is R/L?4-10 when the ratio of the radius of the illumination spot to that of the LED light source is R/L?4-10. The illumination uniformity on the diffusion plate of 300mm?300mm can reach more than 85%. Finally, the simulation model of natural light LED flat panel lamp is established. According to the size of flat panel lamp and the spacing of LED, five kinds of lenses with different specifications are designed, and the illumination effects of five kinds of LED on diffusion plate are simulated. The simulation results show that the uniformity of warm white light, cold white light, red light, cyan light and green light LED on the diffusion plate of 360mm?240mm is 86.2% and 83.489.3%, respectively. Therefore, the light of different colors can be mixed evenly on the diffusion plate, so that the light emitted from the flat lamp is close to the natural light.
【學(xué)位授予單位】：華僑大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TM923.34
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本文編號(hào)：1831047