本文選題：大功率LED燈 + 有限元熱分析　； 參考：《廣東工業(yè)大學(xué)》2014年碩士論文

【摘要】：大功率LED器件作為一種高轉(zhuǎn)化率的綠色固態(tài)光源是目前最具有發(fā)展前景的新興產(chǎn)業(yè)之一。LED路燈是高功率、高熱流密度的電子器件,在長時間的工作中,面臨著路燈中心溫度積聚的問題。LED器件的發(fā)熱問題導(dǎo)致路燈工作不穩(wěn)定,照明的壽命和效率急劇下降。對LED路燈存在的熱問題的研究顯得十分必要。依據(jù)這一背景本文對路燈的發(fā)光原理,熱力學(xué)參數(shù)和散熱結(jié)構(gòu)等關(guān)鍵問題進行探討。 研究采用有限元軟件建立LED路燈模型并數(shù)值模擬其內(nèi)部的熱積累問題,對影響路燈最高溫度和中心熱量傳遞的因素進行分析。發(fā)現(xiàn)路燈散熱器中的等距翅片結(jié)構(gòu),翅片間的疏密程度,散熱器中心翅片的厚度和散熱器底板的厚度對散熱器的水平和垂直傳熱能力影響較大。為進一步研究這幾個因素對路燈散熱能力的影響,采用正交試驗法在不同因素基礎(chǔ)上設(shè)計出相應(yīng)的正交表格,對應(yīng)表格建立散熱結(jié)構(gòu)進行有限元數(shù)值模擬,得到最終優(yōu)化結(jié)構(gòu)。 該優(yōu)化方案解決了一般的LED路燈散熱結(jié)構(gòu)中心溫度過高的問題,使結(jié)構(gòu)的中心溫度接近于結(jié)構(gòu)的邊緣溫度,有效地降低了散熱器的最高溫度,同時加快了整體結(jié)構(gòu)的散熱速度和散熱效率。所做的工作主要包括以下幾個部分： 首先,學(xué)習(xí)功率型LED路燈的基本結(jié)構(gòu)和發(fā)熱原理。包括LED基本結(jié)構(gòu)和工作原理,LED燈的散熱方式,LED溫度的測量方法等； 其次,研究功率型LED路燈的散熱結(jié)構(gòu)和散熱技術(shù)。從散熱原理、功率型LED襯底與封裝技術(shù)、散熱方式和溫度測量方法四個方面分析了功率型LED的散熱關(guān)鍵技術(shù)。 然后,實驗分析及熟練掌握ANSYS軟件進行熱模擬。分別將單個LED燈和路燈驅(qū)動工作,采用合適的溫度測量方法,對單芯片和路燈工作到穩(wěn)定狀態(tài)的溫度進行測量,采用有限元方法對單個LED燈和路燈進行數(shù)值模擬,最后將仿真結(jié)果與實驗數(shù)據(jù)進行對比,驗證仿真的可靠性。 再次,針對要解決的問題,研究LED路燈散熱器的設(shè)計方法。通過對高熱流密度電子器件散熱的經(jīng)典方法和非等溫肋片熱特性進行研究與分析,得到影響LED路燈散熱器性能的三個重要因素分別為散熱器中心翅片的厚度、底板的厚度、不同疏密程度肋片結(jié)構(gòu)。 最后,對方案進行仿真實驗。對應(yīng)影響散熱器散熱的三個因素采用正交實驗設(shè)計法列出正交表。采用ANSYS軟件對LED路燈的溫度進行數(shù)值模擬,得到仿真結(jié)果,并對仿真數(shù)據(jù)進行分析。從而得到對LED路燈溫度進行有效熱控制的優(yōu)化組合。
[Abstract]:High power LED devices as a green solid-state light source with high conversion rate is one of the most promising emerging industries at present. Led street lamps are electronic devices with high power and high heat flux, which have been working for a long time. The heating of LED devices leads to unstable work of street lamps, and the life and efficiency of lighting decrease sharply. It is necessary to study the heat problem of LED street lamp. Based on this background, the luminescence principle, thermodynamic parameters and heat dissipation structure of street lamps are discussed in this paper. In this paper, the LED street lamp model is established with finite element software and the thermal accumulation problem is numerically simulated. The factors affecting the maximum temperature and central heat transfer of the street lamp are analyzed. It is found that the uniform fin structure, the density between the fins, the thickness of the central fin of the radiator and the thickness of the bottom plate of the radiator have great influence on the horizontal and vertical heat transfer ability of the radiator. In order to further study the influence of these factors on the heat dissipation ability of street lamps, the orthogonal test method was used to design the corresponding orthogonal tables on the basis of different factors. The corresponding tables were set up to build the heat dissipation structure and the finite element numerical simulation was carried out, and the final optimized structure was obtained. The optimization scheme solves the problem that the central temperature of the general LED street lamp heat dissipation structure is too high, and makes the center temperature of the structure close to the edge temperature of the structure, and effectively reduces the maximum temperature of the radiator. At the same time, it accelerates the heat dissipation speed and efficiency of the whole structure. The work done consists mainly of the following parts: First, learn the basic structure and heating principle of power LED street lamp. It includes the basic structure and working principle of LED lamp, the way of heat dissipation and the measuring method of LED temperature, etc. Secondly, the heat dissipation structure and heat dissipation technology of power type LED street lamps are studied. The heat dissipation key technology of power type LED is analyzed from four aspects: heat dissipation principle, power LED substrate and packaging technology, heat dissipation mode and temperature measurement method. Then, the experiment analysis and master ANSYS software for thermal simulation. A single LED lamp and a street lamp are driven to measure the temperature of a single chip and street lamp working to a stable state by using a suitable temperature measurement method. The numerical simulation of a single LED lamp and a street lamp is carried out by using the finite element method. Finally, the simulation results are compared with the experimental data to verify the reliability of the simulation. Thirdly, the design method of LED street lamp radiator is studied in view of the problem to be solved. Through the study and analysis of the classical method of heat dissipation of high heat flux electronic devices and the thermal characteristics of non-isothermal fins, three important factors affecting the performance of LED street lamp radiator are obtained, which are the thickness of the center fin of the radiator and the thickness of the bottom plate, respectively. Rib structure with different degree of density. Finally, the scheme is simulated. The orthogonal design method is used to list the orthogonal table for the three factors that affect the radiator heat dissipation. The temperature of LED street lamp is numerically simulated by ANSYS software, and the simulation results are obtained, and the simulation data are analyzed. Thus, the optimal combination of effective thermal control for LED street lamp temperature is obtained.
【學(xué)位授予單位】：廣東工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM923.34

【引證文獻】

相關(guān)碩士學(xué)位論文 前1條

1 溫霞;基于QFD與ANSYS的LED路燈散熱性能優(yōu)化設(shè)計[D];西華大學(xué);2015年

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本文編號：1956253