大功率LED光源散热结构设计及其散热性能研究
发布时间：2018-12-11 16:58
【摘要】：LED光源的推广应用是照明领域的一场新的革命，其发光效率已突破100lm/W，有望在照明领域占据主导地位。相对于传统的照明光源，其具有寿命长、耗能低、可控性高等众多优点。随着人类对照明越来越高的需求，LED光源朝着大功率、高集成化的方向发展，散热问题成为了制约LED光源发展的核心问题，散热不理想将导致光衰、寿命降低以及可靠性降低等一系列的问题。本文针对LED散热问题，设计并制作了3个肋片散热器实物模型，通过实验研究获得了最佳安装角度；并将平板热管与肋片结合组成均温散热器，搭建了一套可靠的测温实验装置，得到了平板热管的相关特性；设计了一种新型立柱式热换散热器，探索了一套仿真优化设计方法并进行了相关参数的设计，为进一步的实验研究提供了理论模型。本文主要研究成果如下： 1.设计制造了3种不同肋片角度的LED用肋片散热器，，通过实时测温实验，获得了3种肋片散热器在不同安装角度下与周围环境温度的温差曲线，得到了肋片安装角度对散热性能的影响规律；参考空气流动的理论并通过仿真计算出表面对流换热系数，结果表明，肋片对表面对流换热气流的行径路线形成了不同程度的干扰，当肋片方向垂直于水平面(即与重力场方向一致)时，对流换热气流的流动更加流畅，具有更大的表面对流换热系数，可以获得较优的散热性能。 2.基于一维稳态导热理论，设计了一种新型的铜柱热源，并搭建了一套可靠的测温实验装置，该测温系统可以模拟LED芯片阵列产生热量，精确计算输出热流密度，减少实验装置变动产生的误差，结构简单可靠。 3.提出将平板热管应用到LED散热领域，将紫铜板与2种不同尺寸的均温板与肋片散热器结合，获得了3种均温肋片散热器；利用本文设计的测温实验装置，获得了各个测温点的温差，测试了均温散热器在不同输入热流密度下的均温性能、均温性响应特性和热阻。 4.设计了3种新型热管散热器，提出了相应的充液及抽真空结构与具体方法，对管壳材料与工作介质进行了选择；设计了一种利用铜丝网弯卷制成的丝网吸液芯结构，该结构热阻小、制作简单，并可防止与热管内壁发生位移与脱离。 5.仿真研究了变量分别为热管直径d、热管高度H、肋片数量N时的散热器热特性；探索了一套仿真优化设计方法，可在保证芯片证结温小于75℃的情况下，获得体积最小的立柱式热管散热器。
[Abstract]:The popularization and application of LED light source is a new revolution in the field of lighting. Its luminous efficiency has exceeded 100lm / W, and it is expected to occupy a dominant position in the field of lighting. Compared with the traditional lighting source, it has many advantages, such as long life, low energy consumption, high controllability and so on. With the increasing demand for lighting, the LED light source is developing in the direction of high power and high integration. Heat dissipation has become the core problem that restricts the development of LED light source, and the poor heat dissipation will lead to light decay. A series of problems such as lower life and lower reliability. In order to solve the problem of LED heat dissipation, three real object models of fin radiator are designed and made in this paper, and the optimal installation angle is obtained through experimental research. The flat heat pipe is combined with the ribbed plate to form a uniform temperature radiator, and a set of reliable experimental device for measuring the temperature is built, and the related characteristics of the flat heat pipe are obtained. A new type of column heat exchanger is designed, a set of simulation optimization design method is explored and the related parameters are designed, which provides a theoretical model for further experimental research. The main research results of this paper are as follows: 1. Three LED fin radiators with different rib angles are designed and manufactured. The temperature difference curves between the three fin radiators and the ambient temperature at different installation angles are obtained through real-time temperature measurement experiments. The influence of rib mounting angle on heat dissipation performance is obtained. Referring to the theory of air flow, the surface convection heat transfer coefficient is calculated by simulation. The results show that the rib plate interferes with the path of the surface convective heat transfer flow to varying degrees. When the rib direction is perpendicular to the horizontal plane (i.e. consistent with the direction of gravity field), the flow of convective heat transfer flow is more fluid, and the surface convection heat transfer coefficient is larger, and the better heat dissipation performance can be obtained. 2. Based on the theory of one dimensional steady state heat conduction, a new type of copper column heat source is designed, and a set of reliable experimental device for temperature measurement is built. The system can simulate the heat generated by LED chip array and accurately calculate the output heat flux. The structure is simple and reliable because of reducing the error caused by the change of the experimental device. 3. The application of flat heat pipe to the field of LED heat dissipation is put forward. Three kinds of uniform temperature fin radiators are obtained by combining copper plate with two different sizes of uniform temperature plate and fin radiator. The temperature difference of each temperature measuring point is obtained by using the experimental device designed in this paper. The average temperature response characteristic and thermal resistance of the uniform temperature radiator under different input heat flux density are tested. 4. Three kinds of new heat pipe radiators are designed, and the corresponding structure and method of filling liquid and pumping vacuum are put forward, and the materials and working medium of shell and tube are selected. A kind of wire mesh absorbent core structure made of copper wire mesh bending is designed. The structure has the advantages of low thermal resistance, simple fabrication, and can prevent displacement and detachment from the inner wall of heat pipe. 5. The thermal characteristics of the radiator with the heat pipe diameter d, the heat pipe height H and the number of ribs N are studied by simulation. A set of simulation optimization design method is explored to obtain the column heat pipe radiator with the smallest volume under the condition that the chip junction temperature is less than 75 鈩
本文编号：2372902
[Abstract]:The popularization and application of LED light source is a new revolution in the field of lighting. Its luminous efficiency has exceeded 100lm / W, and it is expected to occupy a dominant position in the field of lighting. Compared with the traditional lighting source, it has many advantages, such as long life, low energy consumption, high controllability and so on. With the increasing demand for lighting, the LED light source is developing in the direction of high power and high integration. Heat dissipation has become the core problem that restricts the development of LED light source, and the poor heat dissipation will lead to light decay. A series of problems such as lower life and lower reliability. In order to solve the problem of LED heat dissipation, three real object models of fin radiator are designed and made in this paper, and the optimal installation angle is obtained through experimental research. The flat heat pipe is combined with the ribbed plate to form a uniform temperature radiator, and a set of reliable experimental device for measuring the temperature is built, and the related characteristics of the flat heat pipe are obtained. A new type of column heat exchanger is designed, a set of simulation optimization design method is explored and the related parameters are designed, which provides a theoretical model for further experimental research. The main research results of this paper are as follows: 1. Three LED fin radiators with different rib angles are designed and manufactured. The temperature difference curves between the three fin radiators and the ambient temperature at different installation angles are obtained through real-time temperature measurement experiments. The influence of rib mounting angle on heat dissipation performance is obtained. Referring to the theory of air flow, the surface convection heat transfer coefficient is calculated by simulation. The results show that the rib plate interferes with the path of the surface convective heat transfer flow to varying degrees. When the rib direction is perpendicular to the horizontal plane (i.e. consistent with the direction of gravity field), the flow of convective heat transfer flow is more fluid, and the surface convection heat transfer coefficient is larger, and the better heat dissipation performance can be obtained. 2. Based on the theory of one dimensional steady state heat conduction, a new type of copper column heat source is designed, and a set of reliable experimental device for temperature measurement is built. The system can simulate the heat generated by LED chip array and accurately calculate the output heat flux. The structure is simple and reliable because of reducing the error caused by the change of the experimental device. 3. The application of flat heat pipe to the field of LED heat dissipation is put forward. Three kinds of uniform temperature fin radiators are obtained by combining copper plate with two different sizes of uniform temperature plate and fin radiator. The temperature difference of each temperature measuring point is obtained by using the experimental device designed in this paper. The average temperature response characteristic and thermal resistance of the uniform temperature radiator under different input heat flux density are tested. 4. Three kinds of new heat pipe radiators are designed, and the corresponding structure and method of filling liquid and pumping vacuum are put forward, and the materials and working medium of shell and tube are selected. A kind of wire mesh absorbent core structure made of copper wire mesh bending is designed. The structure has the advantages of low thermal resistance, simple fabrication, and can prevent displacement and detachment from the inner wall of heat pipe. 5. The thermal characteristics of the radiator with the heat pipe diameter d, the heat pipe height H and the number of ribs N are studied by simulation. A set of simulation optimization design method is explored to obtain the column heat pipe radiator with the smallest volume under the condition that the chip junction temperature is less than 75 鈩
本文编号：2372902
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