共查询到19条相似文献,搜索用时 156 毫秒
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印制电路板(PCB)厚度方向的导热系数比平面方向的导热系数小得多,为了改善板厚度方向的导热性能,提出了一种改进的自然对流冷却散热方式。首先,通过在PCB板中设计热过孔并在其背面安装散热器,应用热分析软件Icepak对散热模型进行仿真,优化设计散热器翅片的厚度和数目对功率器件温度分布的影响;然后,根据优化后的结果,选定最佳修正尺寸,制作测试结构;最后,采用热电偶法对其进行实验测试,结果表明此散热结构可有效降低器件的温度。 相似文献
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基于APDL的PCB元件布局优化 总被引:2,自引:0,他引:2
随着电子设备集成度的不断提高和功耗的不断加大,电子元器件的发热密度也越来越高,相应地电子产品的过热问题也变得越来越重要.应用热仿真技术,可以在电路板的设计阶段获得其温度分布及最高温度值,通过优化设计,可以降低最高温度值,进而提高电路板模块的热可靠性.针对某主板电路板,利用ANSYS软件提供的APDL语言建立三维有限元热分析简化模型,通过优化板上电子元件的布局,有效地降低了板上最高温度,提高了系统的可靠性. 相似文献
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由于计算机的体积不断缩小,CPU散热器的散热效果对CPU工作性能的影响越加明显,在智能计算机的有限空间散热问题值得深入讨论和研究.本文利用ANSYS软件建立了CPU散热器的三维有限元模型,对其进行热学性能分析.通过改变散热器鳍片角度得到了散热器的温度分布云图和热梯度分布云图,然后对离散数据进行线性拟合,分析了不同角度的散热器鳍片分别与最大温降、热流量、最大长度值之间的函数关系.研究表明,不同角度的鳍片对散热器的散热效果产生一定的影响,为散热器的优化设计提供了重要依据. 相似文献
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采用有限元分析软件ANSYS,分别对基于均温基板和金属芯印刷电路板结合太阳花散热器的100 W的大功率集成封装白光LED进行了热分析。结果发现:(1)相比金属芯印刷电路板,均温基板提高了LED芯片的均温性,可使每个LED芯片的温度分布一致,且每个芯片的最高温度比最低温度仅高1.1℃,避免了局部热点,从而提高了大功率集成封装白光LED的可靠性,保证了它的寿命。(2)太阳花散热器非常适合大功率集成封装白光LED模组的散热。因此对于大功率集成封装白光LED模组而言,均温基板结合太阳花散热器是一种有效的散热方式。 相似文献
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根据空气强迫对流冷却系统一体化设计理念,对9238CPU风扇进行空气动力设计,由Fortran程序输出三维空间曲线文件,导入Pro/E实现实体造型.通过标准风洞对CNC铣床雕刻出的样品进行风扇性能测试.根据风扇数值模拟结果(风扇出口流场特性)设计系列放射状散热器.采用分块六面体网格技术,应用多参考旋转坐标系模型和RNG k-ε模型对风扇和曲线型散热器进行整体数值模拟,模拟结果表明曲线型散热器相对传统垂直型散热器热阻值降低15.9%,最后通过实验证明数值模拟的可信性.一体化设计思想指导下的系列散热器能达到高性能散热效果. 相似文献
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Peter Z. F. Shi Albert C. W. Lu Y. M. Tan Stephen C. K. Wong Eric Tan Ronson Tan 《Microelectronics Reliability》2004,44(5):112-769
This paper describes a thermal design methodology for a 2.5 Gbps optical transmitter that mainly comprises a laser array of 12 VCSELs and a laser driver module. An integrated heat sink design was performed and optimized through modeling and simulation. Temperature regulation of the laser array has been performed through design and optimization of the thermal path (cavity and heat spreader) and separations (wire bonding lengths). Detailed module simulation was performed after the heat sink design and the temperature regulations. To validate the simulation results, a test vehicle of 2.5 Gbps transmitter was built up and tested under various thermal conditions. The airflow rate and ambient temperature were controlled by a wind tunnel. It has shown that the experimental and detailed module simulation results are comparable. A cooling solution with natural convection has been achieved so that the case temperature can be kept under 70 °C without using a fan. The modeling and simulation were done by using a computational fluid dynamics (CFD) program. 相似文献
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The junction temperature of the insulated-gate bipolar transistor (IGBT) module, which belongs to power semiconductor devices, directly impacts on the system performance of the power conversion system (PCS), and therefore, the accurate prediction of the airflow rate passing the heat sink block of the IGBT module is very important at the thermal design stage. In this paper, the thermo-fluid simulation was developed with the T–Q characteristic curve to predict the junction temperature of the IGBT module and the airflow rate of the heat sink block. The porous media model was adopted in the heat sink block with fins and the filled air between fins of the heat sink block in the PCS to remove the heavily concentrated mesh problems in the heat sink block. The proposed simulation model was compared to the experimental value for the hot spot temperature on the heat sink block and the differences were within the average 4.0% margin of error in the comparison. This simulation model can be used to evaluate the suitability of the cooling design according to various operating conditions of the fan and IGBT module with benefits of the reduction in the mesh generation and the computation time. Also, this simulation model increases the flexibility of predicting the airflow rates in the PCS due to the change of the airflow passage structure in the PCS or the capacity of the fan. 相似文献
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介绍了一款大功率发射机的散热设计,由于存在局部热点,采用热管散热装置。设计全程使用了专业电子设备热仿真ICEPAK软件,进行计算机辅助设计,提高了设计效率。设计时根据发热量,计算给出了风机的选择方法。仿真发现即便选用高效率插片成型散热器仍不能消除局部热点,为此在关键热源底部预埋热管,进行温度均匀,这一措施能有效解决这一难题。经过设计验证,取得了很好的效果。 相似文献
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Thermal management in the solid-state lighting sector has become a main issue, due to reliability and efficiency issues. Herein, thermal structure function analysis provides a powerful tool to understand the heat transfer inside operated light emitting diode (LED) modules. In this paper a combined approach of simulation and experiment, as a heat path analysis of a LED module based on four flip chip LEDs, is presented. A validated simulation was used to visualize on the one hand the heat path as isothermals and on the other hand to show an alternative approach of the electrical transient correction. In addition to that, the structure function analysis also included the consideration of influence parameters in terms of different operating conditions (e.g. heat sink temperature, heating current, the use of different thermal interface materials between the device and the heatsink). This was investigated by the statistical Design of Experiments (DOE) approach. The DOE dissected the effect of each input variation to different features of the structure functions. An experimental setup showed, that the temperature of the heat sink caused the dominating effect on the thermal properties of the device. Finally numerical simulation confirmed that these effects came from the temperature dependencies of the thermal conductivities. 相似文献