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目前电子技术的发展速度在不断的提高,一些大功率和高功率的的元器件得以广泛的研制出来,而在对这些电子元器件进行合理时,则需要对其散热性进行充分的考虑,做好热设计工作,从而确保电子元器件性能的可靠性。本文对电子设备散热设计的一般原则进行了分析,并进一步对热设计的主要技术进行了具体的阐述。 相似文献
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电子封装热管理的热电冷却技术研究进展 总被引:2,自引:1,他引:1
电子封装器件中芯片的散热问题一直是制约其发展的瓶颈。综述了芯片的产热特征、散热需求与散热方式。对热电冷却(TEC)技术在芯片散热系统上的应用进行分析,指出了其不足之处与特有的优势。对热电冷却技术在芯片热管理方面应用研究的现状与进展进行了总结评述。 相似文献
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《电子技术与软件工程》2017,(6)
在舰船中会使用到大量的电子元器件,所以舰船有效的散热成为了舰船电子元器件正常运转的重要保障。所以本文首先对有关热量传递的方法以及散热的方法进行了分析,并对舰船中电子设备散热模式和结构设计的选择进行了阐述。 相似文献
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计算机家族中的笔记本PC机是结构高度紧凑的便携式PC机,尽管能量高度集中,但其CPU等芯片器件都是低功耗化的,散热问题并不突出。如今,情况大变,笔记本PC机集高功能、高装配密度、高能量密度和高发热量电子元器件于一体,冷却散热问题尖锐化,已到了非解决不可的时候了。 相似文献
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电子设备散热技术研究 总被引:2,自引:0,他引:2
随着微电子技术的发展,使得电子器件的热流密度不断增加,这样势必对电子器件有更高的散热要求,因此有效地解决散热问题已成为电子设备必须解决的关键技术.针对现代电子设备所面临的散热问题,就自然对流散、强制风冷散热、液体冷却、热管、微槽道冷却、集成热路、热电致冷等常用的电子设备散热技术及某些前沿的研究现状、发展趋势及存在问题分别予以阐述,希望对同行能有所帮助. 相似文献
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以观测设备为研究对象,根据观测设备工作的环境和本身结构特点,选择了传导散热措施;在研究传导散热理论基础上,对大功耗元器件进行了传导散热设计。通过建立有限元模型,对散热片的厚度、散热片的接触面积与各功耗器件的稳态温度关系进行了分析和优化,得到散热片的最优传导面积。实验结果表明,进行了热设计的观测设备,在环境温度为-20~50℃的环境中,通电工作正常,且稳态温度不超过85℃,满足使用要求。 相似文献
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《Components and Packaging Technologies, IEEE Transactions on》2007,30(3):402-410
A multidisciplinary placement optimization methodology for heat generating electronic components on a printed circuit board (PCB) subjected to forced convection in an enclosure is presented. In this methodology, thermal, electrical, and placement criteria involving junction temperature, wiring density, line length for high frequency signals, and critical component location are optimized simultaneously using the genetic algorithm. A board-level thermal performance prediction methodology based on channel flow forced convection boundary conditions is developed. The methodology consists of a combination of artificial neural networks (ANNs) and a superposition method that is able to predict PCB surface and component junction temperatures in a much shorter calculation time than the existing numerical methods. Three ANNs are used for predicting temperature rise at the PCB surface caused by a single heat source at an arbitrary location on the board, while temperature rise due to multiple heat sources is calculated using a superposition method. Compact thermal models are used for the electronic components thermal modeling. Using this optimization methodology, large calculation time reduction is achieved without losing accuracy. To demonstrate its capabilities, the present methodology is applied to a test case involving multiple heat generating component placement optimization on a PCB. 相似文献
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Guarino J.R. Manno V.P. 《Components and Packaging Technologies, IEEE Transactions on》2002,25(3):337-346
A thermal characterization study of laminar air jet impingement cooling of electronic components within a geometry representative of the CPU compartment of a typical portable computer is reported. A finite control volume technique was used to solve for the velocity and temperature fields. Convection, conduction and radiation effects were included in the simulations. The range of jet Reynolds numbers considered was 63 to 1500; the applied compartment heat load ranged from 5-15 W. Radiation effects were significant over the range of Reynolds numbers and heat loads considered, while the effect of natural convection was only noticeable for configurations when the ratio Gr/Re/sup 2/ exceeded 5. The predicted importance of Re rather than jet size was confirmed with test data. Proof of concept was demonstrated with a numerical model representative of a full laptop computer. Both simulations and lab tests showed that low flow rate JI cooling schemes can provide cooling comparable to a high volume flow rate configuration, while using only a fraction of the air flow. Further, under the conservative assumption of steady state, fully powered components, a hybrid cooling scheme utilizing a heat pipe and laminar JI was capable of cooling the processor chip within 11 C of the vendor specified maximum temperature for a system with a total power dissipation of over 21 W. 相似文献
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高功率微波装置在运行时面临的高热流密度散热是当前热控必须解决的难题。微小通道热沉散热结构简单,换热能力突出,在一定程度上能够解决高热流密度散热的问题。但使用微小通道热沉散热时,散热面温度在沿工质流动方向不断升高,这对器件稳定运行不利。而射流冲击技术中流体垂直于热源喷射,温度边界层薄,温度梯度大,换热效果强。将射流冲击技术与微通道热沉相结合,不仅能提高换热系数,增大换热量,而且能实现良好的温度均匀性。对高热流密度下射流冲击微小通道热沉进行数值模拟,分析不同射流孔径对其传热和流动特性的影响。结果表明,增大远离出口处的射流孔径,有利于提高传热效率和减小流动阻力。优化后的射流微通道热沉,在质量流量为14 g/s时,换热系数接近39 000 W/(m2·K)。 相似文献
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Infrared (IR) thermography applications in the design, development and production of printed circuit boards (PCBs), hybrid circuits, microcircuits, and other electronic components are described. This noncontact temperature measurement technique can capture a highly accurate record of the thermal dynamics of small objects at intervals as short as 1/30th of a second. It is ideal for studying the heat distribution across boards to determine the optimum layout of components, the effectiveness of proposed heat-dissipation and -removal devices, and the performance of developmental systems under stimulated load conditions. The effects of the emissivity of the object, the ambient temperature, the atmospheric conditions surrounding the object, and its size and distance from the camera on the temperatures observed by the IR camera are discussed 相似文献
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