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2016 22nd International Workshop on Thermal Investigations of ICs and Systems (THERMINIC)最新文献

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Modelling LED lamps with thermal phenomena taken into account 考虑到热现象的LED灯建模
Pub Date : 2016-09-01 DOI: 10.1109/THERMINIC.2016.7749052
K. Górecki, Przemysław Ptak
This paper is devoted to modelling LED lamps with the use of SPICE software with thermal phenomena taken into account. The electrothermal models of components of such lamps: the LED module and the power supply are proposed. The elaborated model of the lamp makes it possible to calculate optical and electrical quantities characterizing properties of the lamp and additionally, the internal temperatures of components of such lamps. The correctness of the elaborated model was verified experimentally for the selected types of LED lamps. A good agreement between the results of calculations and measurements was obtained.
本文致力于利用SPICE软件对LED灯进行建模,并考虑热现象。提出了LED模块和电源组成部分的电热模型。所述灯的详细模型使得计算表征灯的性质的光学和电学量以及此类灯的组件的内部温度成为可能。通过对所选LED灯具类型的实验验证了所建立模型的正确性。计算结果与实测结果吻合较好。
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引用次数: 7
Multi domain modelling of power LEDs based on measured isothermal and transient I-V-L characteristics 基于测量等温和瞬态I-V-L特性的功率led多域建模
Pub Date : 2016-09-01 DOI: 10.1109/THERMINIC.2016.7749049
G. Farkas, M. Bein, L. Gaal
Recent research has already proved that the characteristics of LED systems can be analyzed creating multi-domain models with tightly coupled electrical, thermal and optical operation. Transient models of the electric and thermal effects have been already successfully established but experimental verification of the dynamic optical behavior was neglected as fast radiometric and photometric measurements have not been available. The present paper outlines two measurement techniques which extend the methodology towards radiometric transients, calibrated by isothermal results. It proposes adequate instrumentation and highlights metrology problems through a measurement example.
最近的研究已经证明,LED系统的特性可以通过创建电、热、光紧密耦合的多域模型来分析。电效应和热效应的瞬态模型已经成功建立,但由于无法进行快速辐射和光度测量,因此忽略了动态光学行为的实验验证。本文概述了两种测量技术,它们扩展了辐射瞬态的方法,通过等温结果校准。它提出了适当的仪器,并通过一个测量实例强调计量问题。
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引用次数: 16
Heat transfer enhancement in micro-scale air flows 微尺度气流中的传热增强
Pub Date : 2016-09-01 DOI: 10.1109/THERMINIC.2016.7749045
M. Rosenfeld
The aim of the present study is to extend air-cooling capabilities. A method of generating an unsteady vortical flow within small annular channels is introduced and studied numerically. The addition of an orifice at the entrance to the channel generates a propagating train of vortex rings that induces the continuous eruption of hot air from the wall region into the core flow. The overall effect is significant transverse convection even in laminar flows and enhancement of heat transfer. The effect of the orifice diameter is studied in detail. The method is very appealing for extending cooling capabilities of heat-sinks based on air, but it works similarly well for single phase flow of liquid. An increase of almost two-fold in the heat dissipation relative to a standard microchannel can be obtained. Heat dissipation of 8watt/cm2 per contact area can be anticipated using a single layer of the proposed air-based orificed-microchannel.
本研究的目的是扩展空气冷却能力。介绍了一种在小环形通道内产生非定常流动的方法,并对其进行了数值研究。在通道入口处增加一个孔口,产生一串涡环,诱导热空气从壁面区域持续喷发到核心流中。整体效果是显著的横向对流,即使在层流和强化传热。详细研究了节流孔直径的影响。这种方法对扩展空气热沉的冷却能力非常有吸引力,但它对单相液体流的效果也很好。相对于标准微通道,可以获得几乎两倍的散热增加。使用所提出的基于空气的孔状微通道的单层,可以预计每个接触面积的散热为8w /cm2。
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引用次数: 0
Calibration methodologies for scanning thermal microscopy 扫描热显微镜校正方法
Pub Date : 2016-09-01 DOI: 10.1109/THERMINIC.2016.7749036
E. Guen, D. Renahy, M. Massoud, J. Bluet, P. Chapuis, S. Gomés
This work analyses the heat transfer between various scanning thermal microscopy (SThM) probes and samples. In order to perform quantitative measurements with SThM techniques, we have developed well-established and reproducible calibration methodologies. We present here two approaches of the SThM measurement: one to measure thermal conductivity of solid materials with a Wollaston SThM microprobe and a second one to evaluate phase transition temperatures of polymeric materials with a silicon low-doped nanoprobe. Based on the comparison of experimental data and modeling results, we have estimated the local resolution of the microprobe to be associated to a radius of 300 nm. Concerning the nanoprobe, we have demonstrated the strong dependence of measurement on sample topography and roughness.
本文分析了扫描热显微镜(SThM)探针与样品之间的传热。为了使用SThM技术进行定量测量,我们开发了完善的可重复的校准方法。本文提出了两种测量SThM的方法:一种是用Wollaston SThM微探针测量固体材料的导热性,另一种是用低掺杂硅纳米探针评估聚合物材料的相变温度。根据实验数据和模型结果的比较,我们估计微探针的局部分辨率与300 nm的半径有关。关于纳米探针,我们已经证明了测量对样品形貌和粗糙度的强烈依赖。
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引用次数: 1
Optimal thermal design of CMOS for direct integration of carbon nanotubes 碳纳米管直接集成CMOS的优化热设计
Pub Date : 2016-09-01 DOI: 10.1109/THERMINIC.2016.7748642
A. Roy, F. Ender, M. Azadmehr, K. Aasmundtveit
Carbon nanotubes (CNTs) exhibit many remarkable mechanical, electrical and thermal properties, which can be exploited in various smart sensing applications by integrating them in a standard CMOS process. However, such integration process is challenging since CMOS process is not suitable for high temperature application required for local CNT synthesis. This work involves designing power efficient CMOS compatible micro-heaters that can generate CNT growth temperature while maintaining CMOS compatible temperature in the microsystem. One metal interconnect layer and a polysilicon layer available in AMS 0.18 μm CMOS technology have been used to design the micro-heaters. This paper proposes and compares four optimal micro-heater designs alongside their thermal & thermomechanical analysis using ANSYS. The promising results are expected to lead the way for successful implementation of carbon nanotube based sensors in a commercial CMOS process.
碳纳米管(CNTs)具有许多卓越的机械、电学和热性能,通过将其集成到标准的CMOS工艺中,可以在各种智能传感应用中得到充分利用。然而,这种集成过程具有挑战性,因为CMOS工艺不适合局部碳纳米管合成所需的高温应用。这项工作包括设计节能的CMOS兼容微加热器,可以在微系统中产生碳纳米管生长温度的同时保持CMOS兼容温度。采用AMS 0.18 μm CMOS技术的金属互连层和多晶硅层设计了微加热器。本文提出并比较了四种微加热器的优化设计,并利用ANSYS对其进行了热力学分析。这些有希望的结果有望在商业CMOS工艺中成功实现基于碳纳米管的传感器。
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引用次数: 1
A study of electrolytic capacitor's thermal conductivity, behavior and measurement 电解电容器的热导率、性能及测量研究
Pub Date : 2016-09-01 DOI: 10.1109/THERMINIC.2016.7749074
Zhigang Na
Electrolytic capacitors are widely used in electric circuits, and their durability is an important contributor for the entire lifespan of an electric device. In order to devise an adequate cooling solution to prevent the electrolytic capacitor from overheating or even burning, the thermal designer needs to completely understand the capacitor's thermal characteristics. In this study, the conductivity of electrolytic capacitor is calculated referring to capacitor's structure and material. Then, capacitor's heat exchange model is set up and all boundary conditions of this model are identified, capacitor's thermal behavior is studied by varying each boundary condition one by one. Furthermore, best point for capacitor temperature measurement is determined in this study. All outcomes of this study are helpful for capacitor's thermal solution design and verification.
电解电容器广泛应用于电路中,其耐用性对电气设备的整个使用寿命至关重要。为了设计适当的冷却解决方案以防止电解电容器过热甚至燃烧,热设计师需要完全了解电容器的热特性。本研究结合电解电容器的结构和材料,计算了电解电容器的电导率。然后,建立了电容器的换热模型,并确定了该模型的所有边界条件,通过逐一改变各个边界条件来研究电容器的热行为。此外,本研究还确定了电容温度测量的最佳点。研究结果对电容器热解决方案的设计和验证具有一定的指导意义。
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引用次数: 3
Evolution of the DELPHI compact thermal modelling method: An investigation on the boundary conditions scenarios DELPHI紧凑热模拟方法的演化:边界条件情景的研究
Pub Date : 2016-09-01 DOI: 10.1109/THERMINIC.2016.7748651
E. Monier-Vinard, V. Bissuel, B. Rogié, N. Laraqi, O. Daniel, Marie-Cécile Kotelon
Board-level simulation has to consider, at the earliest stage of the conception, the impact of the vicinity of numerous high and medium powered devices. In 1996, the concept of Compact Thermal Model was defined, by the European consortium DELPHI to minimize the computation times, from days to minutes. A CTM resumes an electronic component as a simple cuboid form and a network of resistors that links a single temperature-sensitive node to major surfaces of heat extraction. Unfortunately the DELPHI method is restricted to steady-state model for mono-chip component. More complex issues such as multi-chip module or transient thermal model remain today for worldwide companies a non-trivial challenge. Our latest improvements made to generate steady-state multi-source CTM for System-In-Package devices showed that the number of boundary-condition scenarios is quite prohibitive when several nodes need to be monitored. The present work investigates the use of fractional factorial experiment, such as N-variables Doehlert design. The objective of this study is to define the lowest number of numerical simulations while keeping the highest accuracy level of the derived Boundary-Condition-Independent thermal network.
板级仿真必须考虑,在概念的最早阶段,附近的许多高功率和中等功率器件的影响。1996年,欧洲财团DELPHI定义了紧凑型热模型的概念,以尽量减少计算时间,从几天到几分钟。CTM将电子元件恢复为简单的长方体形式和电阻网络,该网络将单个温度敏感节点连接到主要的热提取表面。遗憾的是,德尔菲法仅限于单片元件的稳态模型。更复杂的问题,如多芯片模块或瞬态热模型,仍然是当今全球公司面临的一个不小的挑战。我们为系统级封装设备生成稳态多源CTM所做的最新改进表明,当需要监控多个节点时,边界条件场景的数量是相当令人望而却步的。本研究探讨了分数因子实验的使用,如n变量Doehlert设计。本研究的目的是定义最少的数值模拟次数,同时保持导出的边界条件无关热网络的最高精度水平。
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引用次数: 2
Analysis of the impact of power distribution on the efficiency of microchannel cooling in 3D ICs 三维集成电路中功率分布对微通道散热效率的影响分析
Pub Date : 2016-09-01 DOI: 10.1109/THERMINIC.2016.7749033
P. Zając, C. Maj, A. Napieralski
Liquid microchannel cooling of 3D ICs is a very attractive idea which could help solving the problem of ever-increasing power dissipation due to its good cooling efficiency and potential scalability. However, this cooling method has some very different properties than the well-understood forced air convection. In particular, its cooling efficiency with respect to power variations in the chip is still not completely analysed. Therefore, in this paper a thorough study of microchannel cooling efficiency as a function of intra- and interlayer power consumption variation is presented. We use a finite element method analysis to run a coupled thermo-fluidic simulation of a dedicated 3D chip model. We show that the placement of chip units with respect to microchannels can significantly influence the peak chip temperature. In particular, for a 3D chip including Intel's i7-6950X 10-core processor, a temperature difference of nearly 9°C was observed.
液体微通道冷却技术以其良好的冷却效率和潜在的可扩展性,为解决3D集成电路日益增长的功耗问题提供了一种非常有吸引力的思路。然而,这种冷却方法与众所周知的强迫空气对流有一些非常不同的特性。特别是,它的冷却效率相对于功率变化的芯片仍然没有完全分析。因此,本文对微通道冷却效率随层内和层间功耗变化的函数进行了深入研究。本文采用有限元分析方法对专用三维芯片模型进行了热-流耦合仿真。我们表明,芯片单元相对于微通道的放置可以显著影响芯片的峰值温度。特别是,对于包含英特尔i7-6950X 10核处理器的3D芯片,观察到的温差接近9°C。
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引用次数: 4
Investigation on solder voids in flip-chip light-emitting diodes using thermal transient response 利用热瞬态响应研究倒装式发光二极管中焊料空洞
Pub Date : 2016-09-01 DOI: 10.1109/THERMINIC.2016.7749064
B. Ma, C. Kim, Kun-hyung Lee, W. Suh, K. Lee
In order to reduce the cost of the LED packages and to minimize the thermal budget, the chip-on-board (COB) packages and the chip-scale package (CSP) LEDs, based on flip-chip die bonding process, have been developed. Although the flip-chip die bonding process for the COB and the CSP LEDs is useful to decrease the thermal resistance, a precise process control for minimizing voids in solder joint and an in-line inspection for bonding quality check are needed for reliability. We proposed a simple in-line void inspection method based on the thermal transient response of LED junction temperature. In order to carry out the feasibility test, we made three LED package groups showing different solder void qualities. By measuring voltages at two points in time domain, we could distinguish the LED packages showing a poor solder void quality.
为了降低LED封装的成本和最大限度地减少热预算,基于倒装芯片键合工艺的片上封装(COB)和片级封装(CSP) LED被开发出来。虽然COB和CSP led的倒装芯片键合工艺有助于降低热阻,但为了保证可靠性,需要精确的工艺控制,以最大限度地减少焊点中的空隙,并对键合质量进行在线检查。提出了一种基于LED结温热瞬态响应的简单在线空隙检测方法。为了进行可行性测试,我们制作了三个具有不同焊隙质量的LED封装组。通过测量时域两个点的电压,我们可以区分出显示焊接空洞质量差的LED封装。
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引用次数: 2
LED module multi-physic approach LED模组多物理场方法
Pub Date : 2016-09-01 DOI: 10.1109/THERMINIC.2016.7749050
T. Renaudin, J. Joly, B. Hamon, B. Tothe
Since the start of the Ledification of lighting systems, the multi-physic “optical, electrical, thermal” characterization of LED light sources is a critical task in Philips Lighting. Dedicated teams are responsible for determining multi-physic models and design-in rules of LED modules which will be later integrated in luminaires (lighting systems). Recent works have focus on generating more and more accurate LED Module mutli-physics models. These models have been used to predict and guaranty the performance, reliability and safety of the developed luminaires. In this paper, recent results regarding multi-physics models are exposed. The evolution of the test methods and equipment is discussed highlighting the major challenges in the definition of “boundary independent” LED modules models. In addition, an inter laboratory comparison has been conducted on T3ster equipment. The comparison outcomes have been gathered to provide a non-exhaustive, but useful identification of discrepancies root causes and sources of uncertainty. In this paper some guidelines will be provided to limit them.
自照明系统的Ledification开始以来,LED光源的多物理场“光学、电气、热”特性是飞利浦照明的一项关键任务。专门的团队负责确定LED模块的多物理模型和设计规则,这些模块随后将集成到灯具(照明系统)中。近年来的工作主要集中在生成越来越精确的LED模组多物理场模型上。这些模型已用于预测和保证所研制灯具的性能、可靠性和安全性。本文介绍了多物理场模型的最新研究成果。讨论了测试方法和设备的发展,强调了“边界独立”LED模块模型定义中的主要挑战。此外,还对T3ster设备进行了实验室间比较。收集比较结果是为了对差异的根本原因和不确定性的来源提供一个不详尽但有用的识别。本文将提供一些准则来限制它们。
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引用次数: 0
期刊
2016 22nd International Workshop on Thermal Investigations of ICs and Systems (THERMINIC)
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