大功率LED应用设计的热特性分析方法研究

发布时间：2018-04-21 07:56

本文选题：大功率LED + 热特性　；参考：《东北林业大学》2014年博士论文

【摘要】：大功率LED作为照明光源在近十年的技术发展中日趋成熟,随着光源器件的技术进步和产品升级,新一代的照明技术和产品已经由实验性使用和工艺探索阶段进入到关注应用和普及替换阶段。在经历了初始探索性应用阶段后,对大功率LED应用设计技术的研究就更显突出重要。大功率LED光源的应用设计的核心要求,就是满足照明的高光效性、适宜的配光、稳定可靠的工作、长寿命低光哀。这就需要对器件的品性具有深度的了解和分析。本文就大功率LED的热特性分析方法进行研究和讨论,为大功率LED光源的应用设计提供依据和手段。大功率LED的热特性研究是应用设计的基础。针对LED结温对其性能特性影响以及由此带来的光衰和可靠性问题,本文将不局限于单一的温度或者是热学的技术指标分析,而通过围绕器件本身的结构特性以及所涉及光电热多参数特性指标来综合分析与研究,包括LED组件电路结构、不同拓扑结构的驱动模型、LED热阻分析、组件的热场分布特征、恒流驱动电路设计。热辐射探测技术是研究大功率LED的热特性设计中非常有效的工具和手段,尤其是可以实现热辐射场的可视化技术,能够更为直观地了解和分析光源的组件的热特性。实现对光源组件的热场探测和可视化技术研究也是本文的很重要的组成部分。为了更为全面地解析大功率LED光源器件在不同的构件模式下的电热特性,提高LED照明应用设计品质,本论文围绕上述重要内容开展大功率LED应用设计的热特性分析方法研究,并取得以下创新性研究成果：采用红外热辐射探测技术对LED的热特性进行分析,提出等发射率法实现非接触测温。在热平衡条件下,运用斯蒂芬波尔斯曼的全幅射理论,以等辐射原则实现了LED的热辐射测温计算方法。在实验数据分析和理论研究的基础上,给出了LED热辐射测温的数学计算模型。依据大功率LED的基本结构模型,分析和研究了驱动方式对LED的特性影响。给出了多芯片大功率LED电路拓扑结构和布局结构对性能的影响性分析,并对大功率LED组件的驱动模型进行了分类研究。对于恒流驱动模式下LED组件的伏安特性进行分析,给出了恒流驱动模式下的组件电路拓扑结构的优化选择模型。为组件的电路拓扑结构的选择提供了理论依据。提出了基于热辐射数据可视化的大功率LED热特性研究方法,对于大功率LED的热设计由单一抽象的集中参数设计拓展为可视化的直观热场状态描述。并在热场数据可视化的基础上,构建了图示化特性分析手段。充分利用辐射数据的直观图形化描述,对大功率LED组件的热场分布提供了更加有效的趋势观察和对比分析的方法。研究中,采用了理论分析和实验数据验证相结合的方法,针对大功率LED的热特性以及相关的驱动技术的综合性研究。利用所设计完成的可视化处理系统,对集成LED组件进行了数据采集和测试分析,给出了基于等发射率测温法的温度计算结果和测量对比分析。进一步验证了模型的正确性和可用性。论文所给出的模型和测试数据是有效的和可借鉴的。所完成的设计软件具有很好的实用性,可作为进一步分析研和设计应用的有效工具。
[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.

【学位授予单位】：东北林业大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TM923.34

【参考文献】