本文選題：大功率LED + 熱特性　； 參考：《東北林業(yè)大學(xué)》2014年博士論文

【摘要】：大功率LED作為照明光源在近十年的技術(shù)發(fā)展中日趨成熟,隨著光源器件的技術(shù)進(jìn)步和產(chǎn)品升級(jí),新一代的照明技術(shù)和產(chǎn)品已經(jīng)由實(shí)驗(yàn)性使用和工藝探索階段進(jìn)入到關(guān)注應(yīng)用和普及替換階段。在經(jīng)歷了初始探索性應(yīng)用階段后,對(duì)大功率LED應(yīng)用設(shè)計(jì)技術(shù)的研究就更顯突出重要。大功率LED光源的應(yīng)用設(shè)計(jì)的核心要求,就是滿足照明的高光效性、適宜的配光、穩(wěn)定可靠的工作、長(zhǎng)壽命低光哀。這就需要對(duì)器件的品性具有深度的了解和分析。本文就大功率LED的熱特性分析方法進(jìn)行研究和討論,為大功率LED光源的應(yīng)用設(shè)計(jì)提供依據(jù)和手段。 大功率LED的熱特性研究是應(yīng)用設(shè)計(jì)的基礎(chǔ)。針對(duì)LED結(jié)溫對(duì)其性能特性影響以及由此帶來的光衰和可靠性問題,本文將不局限于單一的溫度或者是熱學(xué)的技術(shù)指標(biāo)分析,而通過圍繞器件本身的結(jié)構(gòu)特性以及所涉及光電熱多參數(shù)特性指標(biāo)來綜合分析與研究,包括LED組件電路結(jié)構(gòu)、不同拓?fù)浣Y(jié)構(gòu)的驅(qū)動(dòng)模型、LED熱阻分析、組件的熱場(chǎng)分布特征、恒流驅(qū)動(dòng)電路設(shè)計(jì)。熱輻射探測(cè)技術(shù)是研究大功率LED的熱特性設(shè)計(jì)中非常有效的工具和手段,尤其是可以實(shí)現(xiàn)熱輻射場(chǎng)的可視化技術(shù),能夠更為直觀地了解和分析光源的組件的熱特性。實(shí)現(xiàn)對(duì)光源組件的熱場(chǎng)探測(cè)和可視化技術(shù)研究也是本文的很重要的組成部分。為了更為全面地解析大功率LED光源器件在不同的構(gòu)件模式下的電熱特性,提高LED照明應(yīng)用設(shè)計(jì)品質(zhì),本論文圍繞上述重要內(nèi)容開展大功率LED應(yīng)用設(shè)計(jì)的熱特性分析方法研究,并取得以下創(chuàng)新性研究成果： 采用紅外熱輻射探測(cè)技術(shù)對(duì)LED的熱特性進(jìn)行分析,提出等發(fā)射率法實(shí)現(xiàn)非接觸測(cè)溫。在熱平衡條件下,運(yùn)用斯蒂芬波爾斯曼的全幅射理論,以等輻射原則實(shí)現(xiàn)了LED的熱輻射測(cè)溫計(jì)算方法。在實(shí)驗(yàn)數(shù)據(jù)分析和理論研究的基礎(chǔ)上,給出了LED熱輻射測(cè)溫的數(shù)學(xué)計(jì)算模型。 依據(jù)大功率LED的基本結(jié)構(gòu)模型,分析和研究了驅(qū)動(dòng)方式對(duì)LED的特性影響。給出了多芯片大功率LED電路拓?fù)浣Y(jié)構(gòu)和布局結(jié)構(gòu)對(duì)性能的影響性分析,并對(duì)大功率LED組件的驅(qū)動(dòng)模型進(jìn)行了分類研究。對(duì)于恒流驅(qū)動(dòng)模式下LED組件的伏安特性進(jìn)行分析,給出了恒流驅(qū)動(dòng)模式下的組件電路拓?fù)浣Y(jié)構(gòu)的優(yōu)化選擇模型。為組件的電路拓?fù)浣Y(jié)構(gòu)的選擇提供了理論依據(jù)。 提出了基于熱輻射數(shù)據(jù)可視化的大功率LED熱特性研究方法,對(duì)于大功率LED的熱設(shè)計(jì)由單一抽象的集中參數(shù)設(shè)計(jì)拓展為可視化的直觀熱場(chǎng)狀態(tài)描述。并在熱場(chǎng)數(shù)據(jù)可視化的基礎(chǔ)上,構(gòu)建了圖示化特性分析手段。充分利用輻射數(shù)據(jù)的直觀圖形化描述,對(duì)大功率LED組件的熱場(chǎng)分布提供了更加有效的趨勢(shì)觀察和對(duì)比分析的方法。 研究中,采用了理論分析和實(shí)驗(yàn)數(shù)據(jù)驗(yàn)證相結(jié)合的方法,針對(duì)大功率LED的熱特性以及相關(guān)的驅(qū)動(dòng)技術(shù)的綜合性研究。利用所設(shè)計(jì)完成的可視化處理系統(tǒng),對(duì)集成LED組件進(jìn)行了數(shù)據(jù)采集和測(cè)試分析,給出了基于等發(fā)射率測(cè)溫法的溫度計(jì)算結(jié)果和測(cè)量對(duì)比分析。進(jìn)一步驗(yàn)證了模型的正確性和可用性。論文所給出的模型和測(cè)試數(shù)據(jù)是有效的和可借鑒的。所完成的設(shè)計(jì)軟件具有很好的實(shí)用性,可作為進(jìn)一步分析研和設(shè)計(jì)應(yīng)用的有效工具。
[Abstract]:High power LED is becoming more and more mature in the development of the technology in the last ten years. With the technological progress and product upgrading of the light source devices, the new generation of lighting technology and products have come into the stage of attention to application and popularization from the stage of experimental use and process exploration. After the initial exploratory stage of application, the high power L The research on ED application design technology is more and more important. The core requirement of the application design of high power LED light source is to satisfy the high light efficiency of the lighting, the suitable light distribution, the stable and reliable work, the long life and low light grief. This needs to have a deep understanding and analysis of the character of the device. This paper analyzes the thermal characteristic analysis method of the high power LED The research and discussion will provide the basis and means for the design and application of high-power LED light source.
The study of thermal characteristics of high power LED is the basis of application design. In view of the effect of LED junction temperature on its performance characteristics and the resulting light failure and reliability, this paper will not be limited to a single temperature or thermal analysis of technical specifications, and by the structure characteristics of the device itself and the characteristics of the multi parameter photothermal parameters involved. Integrated analysis and research, including LED component circuit structure, driving model of different topology structure, LED thermal resistance analysis, thermal field distribution characteristics of components, constant current drive circuit design. Thermal radiation detection technology is a very effective tool and means to study the thermal characteristic design of high power LED, especially the visualization of thermal radiation field. Technology can understand and analyze the thermal characteristics of the components of the light source more intuitively. It is also an important part of this paper to realize the research on the thermal field detection and visualization of the light source components. In order to more fully analyze the electric heating characteristics of the large power LED light source in the different component modes, improve the design quality of the LED lighting application. In this thesis, we focus on the above important contents to carry out the research on the thermal characteristic analysis method of high-power LED application design.
The thermal characteristics of LED are analyzed by infrared thermal radiation detection technology, and the non contact temperature measurement is realized by the equal emissivity method. Under the condition of heat balance, using the Stephen Pohl Hirshman's full radiation theory and the principle of equal radiation, the thermal radiation temperature measurement method of LED is realized. On the basis of the analysis of experimental data and the theoretical study, the LED is given. A mathematical model of thermal radiation temperature measurement.
Based on the basic structure model of high power LED, the influence of the driving mode on the characteristics of LED is analyzed and studied. The influence of the topology and layout structure of the multichip high power LED circuit on the performance is given, and the driving model of the high-power LED component is classified. The volt ampere characteristics of the LED component under the constant current drive mode are introduced. The optimal selection model of component circuit topology under constant current driving mode is given, which provides a theoretical basis for the selection of circuit topology of components.
A high power LED thermal characteristic research method based on the visualization of thermal radiation data is proposed. The thermal design of high power LED is developed from a single abstract parameter design to visual hot field state description. On the basis of the visualization of the thermal field data, a graphic special analysis method is constructed. The visualization of the radiation data is fully utilized. Graphical description provides a more effective trend observation and comparative analysis method for the thermal field distribution of high-power LED components.
In the study, a combination of theoretical analysis and experimental data verification is adopted to study the thermal characteristics of high power LED and the comprehensive study of the related driving techniques. Using the designed visual processing system, the data collection and test analysis of the integrated LED components are carried out, and the temperature calculation based on the isothermal method of temperature measurement is given. The results and measurements are compared and analyzed. The correctness and availability of the model are further verified. The model and test data presented in this paper are effective and can be used for reference. The completed design software is of good practicability and can be used as an effective tool for further analysis and application of design.

【學(xué)位授予單位】：東北林業(yè)大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM923.34

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