Ansys-热分析实例(多芯片组件加散热器(热沉)的冷却分析)

1、三.MCM温度场稳态分析多芯片组件加散热器(热沉)的冷却分析图1(a)、图1(b)所示分别为大功率球栅阵列MCM的截面图和俯视图，五个芯片采用倒装焊方式置于有机基板上，为了增加模块的散热能力，在芯片背面上加一热扩展面。表1所示为各材料的物理属性。皿2叫Th鸟科M14ft4ldbTyfnSciSH,.；：八二斗周围的环境温度设为250C,其中大芯片的功率为25W,热流密度为60 xl06W/m3；周围四个小芯片的功率为10W,热流密度为61.54xlO6W/m3；对流换热系数为10W/(mK)。MCM结构参数和材料属性模型组件材料尺寸(mm)导热系数(W/(mk)-FHLL芯片硅8*8*0.65

2、,5*5*0.6582芯片凸点5Sn/98Pb1O*1O*,6*6,0O.3,Height:0.2,Pitch:0.7536基板聚酰亚胺40*40*1.50.2焊料球96.5Sn3.5Ag26*26,00.6,Height:0.4,Pitch:1.2750PCBFR4100*100*1.58.37,8.37,0.32热介质材料导热脂Thick:0.151粘接剂粘接剂Thick:0.151.1热扩展面铜40*40*1.5390热沉铝Base:46.5*45.6*1.5,Pinnumber:16,Pinheight:8240分析从而导致器件性能变化和可靠性的下降。热场分析和设计是MCM设计中一个重

3、要的环节3。MCM器件中的热应力来自两个方面，即来自MCM模块内部和MCM模块所处的外部环境所形成的热应力，这些热应力都会影响到器件的电性能、工作频率、机械强度和可靠性。随着MCM集成度的提高和体积的缩小尤其是对于集成了大功率芯片的MCM其内部具有多个热源，热源之间的热耦合作用较强，单位体积内的功耗很大，由此带来的芯片热失效和热退化现象突出。有资料表明,器件的工作温度每升高10C，其失效率增加1倍。因此准确模拟大功率MCM模块的三维温度场分布，并分析掌握其热特性，有利于指导MCM热设计方案的选择，对提高大功率MCM的可靠性具有重要意义。本文针对某球栅阵列封装的大功率MCM，提出了一种简化的热学

4、模型，并利用有限元方法借助有限元通用程序ANSYS对其进行三维温度场的稳态模拟和分析。方案步骤如下：、建模、施加载荷计算、初始温度及对流系数（施加于模型外表面，即与空气接触的部位）PUIWTSTYPENUMCLiI-n7-HCLiE10ANDEC2200919:48:111.PLlIMTSTYPENUMCUI-HCUE10ANDEC2200919:50:46热沉的芯片内部温度分布云图TEMP(AVG)RSYS=O5W=45D2SI=131554NODALSOLUTIONSTEP=1SUE：=1DEC6200922:09:06NODALSOLUTILIN5TEP=1SUE：=1TIME=1TEM

5、PANDEC6200944.52446.192理焊料球(37Sn/63Pb)温度分布云图357.86556.19859.53-3简要分析从以上的分析结果可以得出：最高温度出现在中间大芯片区域，内部有源功率芯片是热源的主要贡献者，芯片产生的热量主要沿芯片背面方向传递；加散热装置来对大功率进行降温是一种直接有效的方式；另外，在相同条件下，合理的结构布局，如避免大功率器件过分集中不仅能降低结点温度最大值，而且能避免热集中现象，提高组件的可靠性。针对球栅阵列封装的大功率MCM其内部具有多个热源、耦合作用强、内部发热量大、温度高的特点，建立其热学模型，在ANSYS平台下对其进行了稳态模拟分析；结果表明，

6、增加外部散热装置可以大大降低MCM的温度，是对其进行降温最直接有效的一种方式；合理布局可以避免热集中现象。5结论在MCM器件内部，热场对器件的性能和可靠性有严重的影响，热场分析是MCM设计中的重要环节。利用ANSYS软件对一球栅阵列的MCM进行了模拟分析，结果表明：多芯片组件中,大功率芯片为模块中热源的主要贡献者,芯片内最高温度点位于中间大芯片区域。MCM几种降低温度的方法：加外部散热装置是一种直接有效的对MCM进行降温方式(有散热装置的最高温度是132.823oC，没有散热的布局温度大概达350C)；在相同条件下，合理的结构布局，能降低结点温度最大值，提高MCM组件的可靠性。参考文献：杨邦朝

7、，张经国.多芯片组件技术及其应用.电子科技大学出版社M.2001：4042李川.MCM的热分析及复合SnPb焊点的应力应变分析D.电子科技大学.四川：成都，2005陈云，徐晨.有限元分析软件ANSYS在多芯片组件热分析中的应用J.电子工程师2007(2)；张洪信主编有限元基础理论与ANSYS应用.机械工业出版社，2006.2(2007.1重印)：徐步陆.电子封装可靠性研究D.中国科学院上海微系统与信息技术研究所，博士学位论文2002命令代码/BATCH/input,menust,tmp,1WPSTYLE,0/PREP7BLOCK,0,0.05,0,0.05,0,0.0015,BLOCK,0,0

8、.02,0,0.02,0.0019,0.0034,BLOCK,0,0.02,0,0.02,0.00355,0.00505,BLOCK,0,0.017,0,0.017,0.00355,0.0044,VSBV,3,4BLOCK,0,0.004,0,0.004,0.0036,0.00425,BLOCK,0,0.0025,0.0085,0.0135,0.0036,0.00425,BLOCK,0.0085,0.0135,0,0.0025,0.0036,0.00425,wpoff,0,0,0.0017SPH4,0.000635,0.000635,0.0003BLOCK,0,0.001,0,0.001,0.

9、0002,0.0006,BLOCK,0,0.001,0,0.001,-0.0002,-0.0006,FLST,3,2,6,ORDE,2FITEM,3,8FITEM,3,-9VSBV,7,P51XNUMCMP,VOLUFLST,3,1,6,ORDE,1FITEM,3,7VGEN,13,P51X,0.00127,0FLST,3,13,6,ORDE,2FITEM,3,7FITEM,3,-19VGEN,13,P51X,0.00127,0wpoff,0,0,0.0018SPH4,0.000275,0.000275,0.00015BLOCK,0,0.001,0,0.001,0.0001,0.0006,BL

10、OCK,0,0.001,0,0.001,-0.0001,-0.0006,FLST,3,2,6,ORDE,2FITEM,3,177FITEM,3,178VSBV,176,P51XFLST,3,1,6,ORDE,1FITEM,3,179VGEN,5,P51X,0.00075,0FLST,3,5,6,ORDE,2FITEM,3,176FITEM,3,-180VGEN,5,P51X,0.00075,0FLST,3,1,6,ORDE,1FITEM,3,179VGEN,2,P51X,0.00875,0FLST,3,1,6,ORDE,1FITEM,3,201VGEN,6,P51X,0.00075,0FLST

11、,3,6,6,ORDE,2FITEM,3,201FITEM,3,-206VGEN,3,P51X,0.00075,0FLST,3,1,6,ORDE,1FITEM,3,179VGEN,2,P51X,0.00875,0FLST,3,1,6,ORDE,1FITEM,3,219VGEN,6,P51X,0.00075,0FLST,3,6,6,ORDE,2FITEM,3,219FITEM,3,-224VGEN,3,P51X,0.00075,0BLOCK,0.017,0.02,0,0.017,-0.0001,0.00005,BLOCK,0,0.02,0.017,0.02,-0.0001,0.00005,wpo

12、ff,0,0,0.00075BLOCK,0,0.004,0,0.004,0,0.00015,BLOCK,0.0085,0.0135,0,0.0025,0,0.00015,BLOCK,0,0.0025,0.0085,0.0135,0,0.00015,WPAVE,0,0,0CSYS,0wpoff,0,0,0.00505BLOCK,0,0.02325,0,0.02325,0,0.0015,BLOCK,0.02175,0.02325,0,0.02325,0.0015,0.0085,FLST,3,1,6,ORDE,1FITEM,3,243VGEN,8,P51X,-0.003,0VSEL,S,LOC,Z,

13、0.00505,0.02FINISH/SOLFINISH/PREP7FLST,2,9,6,ORDE,2FITEM,2,242FITEM,2,-250VADD,P51XVSEL,S,LOC,Z,0.0034,0.00425VSEL,U,5FLST,2,2,6,ORDE,2FITEM,2,195FITEM,2,216VDELE,P51X,1ALLSEL,ALLFLST,2,240,6,ORDE,7FITEM,2,1FITEM,2,-194FITEM,2,196FITEM,2,-215FITEM,2,217FITEM,2,-241FITEM,2,251VGLUE,P51XET,1,SOLID70MP

14、TEMP,MPTEMP,1,0MPDATA,KXX,1,82MPTEMP,MPTEMP,1,0MPDATA,KXX,2,36MPTEMP,MPTEMP,1,0MPDATA,KXX,3,0.2MPTEMP,MPTEMP,1,0MPDATA,KXX,4,50MPTEMP,MPTEMP,1,0MPDATA,KXX,5,8.37MPDATA,KYY,5,8.37MPDATA,KZZ,5,0.32MPTEMP,MPTEMP,1,0MPDATA,KXX,6,1MPTEMP,MPTEMP,1,0MPDATA,KXX,7,1.1MPTEMP,MPTEMP,1,0MPDE,KXX,6MPDATA,KXX,6,1

15、MPTEMP,MPTEMP,1,0MPDATA,KXX,8,390MPTEMP,MPTEMP,1,0MPDATA,KXX,9,240VSEL,S,LOC,Z,0,0.0015CM,_Y,VOLUVSEL,250CM,_Y1,VOLUCMSEL,S,_YCMSEL,S,_Y1VATT,5,1,0CMSEL,S,_YCMDELE,_YCMDELE,_Y1VSEL,S,LOC,Z,0.0015,0.0019FLST,5,169,6,ORDE,2FITEM,5,7FITEM,5,-175CM,_Y,VOLUVSEL,P51XCM,_Y1,VOLUCMSEL,S,_YCMSEL,S,_Y1VATT,4,

16、1,0CMSEL,S,_YCMDELE,_YCMDELE,_Y1VSEL,S,LOC,Z,0.0019,0.0034CM,_Y,VOLUVSEL,252CM,_Y1,VOLUCMSEL,S,_YCMSEL,S,_Y1VATT,3,1,0CMSEL,S,_YCMDELE,_YCMDELE,_Y1VSEL,S,LOC,Z,0.0034,0.00425VSEL,S,LOC,Z,0.0034,0.0036FLST,5,2,6,ORDE,2FITEM,5,195FITEM,5,244CM,_Y,VOLUVSEL,P51XCM,_Y1,VOLUCMSEL,S,_YCMSEL,S,_Y1VATT,7,1,0

17、CMSEL,S,_YCMDELE,_YCMDELE,_Y1FLST,5,2,6,ORDE,2FITEM,5,195FITEM,5,244VSEL,U,P51XFLST,5,59,6,ORDE,6FITEM,5,176FITEM,5,-194FITEM,5,196FITEM,5,-215FITEM,5,217FITEM,5,-236CM,_Y,VOLUVSEL,P51XCM,_Y1,VOLUCMSEL,S,_YCMSEL,S,_Y1VATT,2,1,0CMSEL,S,_YCMDELE,_YCMDELE,_Y1VSEL,S,LOC,Z,0.0036,0.00425FLST,5,3,6,ORDE,2

18、FITEM,5,246FITEM,5,-248CM,_Y,VOLUVSEL,P51XCM,_Y1,VOLUCMSEL,S,_YCMSEL,S,_Y1VATT,1,1,0CMSEL,S,_YCMDELE,_YCMDELE,_Y1VSEL,S,LOC,Z,0.00425,0.00505CM,_Y,VOLUVSEL,245CM,_Y1,VOLUCMSEL,S,_YCMSEL,S,_Y1VATT,8,1,0CMSEL,S,_YCMDELE,_YCMDELE,_Y1VSEL,U,245FLST,5,3,6,ORDE,3FITEM,5,216FITEM,5,242FITEM,5,-243CM,_Y,VOL

19、UVSEL,P51XCM,_Y1,VOLUCMSEL,S,_YCMSEL,S,_Y1VATT,6,1,0CMSEL,S,_YCMDELE,_YCMDELE,_Y1VSEL,S,LOC,Z,0.00505,0.02CM,_Y,VOLUVSEL,249CM,_Y1,VOLUCMSEL,S,_YCMSEL,S,_Y1VATT,9,1,0CMSEL,S,_YCMDELE,_YCMDELE,_Y1VSEL,S,LOC,Z,0.0036,0.00425SMRT,6SMRT,7MSHAPE,1,3DMSHKEY,0FLST,5,3,6,ORDE,2FITEM,5,246FITEM,5,-248CM,_Y,V

20、OLUVSEL,P51XCM,_Y1,VOLUCHKMSH,VOLUCMSEL,S,_YVMESH,_Y1CMDELE,_YCMDELE,_Y1CMDELE,_Y2VSEL,S,LOC,Z,0.0034,0.00355SMRT,8CM,_Y,VOLUVSEL,244CM,_Y1,VOLUCHKMSH,VOLUCMSEL,S,_YVMESH,_Y1CMDELE,_YCMDELE,_Y1CMDELE,_Y2CM,_Y,VOLUVSEL,195CM,_Y1,VOLUCHKMSH,VOLUCMSEL,S,_YVMESH,_Y1CMDELE,_YCMDELE,_Y1CMDELE,_Y2VSEL,S,LO

21、C,Z,0.0019,0.0034CM,_Y,VOLUVSEL,252CM,_Y1,VOLUCHKMSH,VOLUCMSEL,S,_YVMESH,_Y1CMDELE,_YCMDELE,_Y1CMDELE,_Y2VSEL,S,LOC,Z,0,0.0015CM,_Y,VOLUVSEL,250CM,_Y1,VOLUCHKMSH,VOLUCMSEL,S,_YVMESH,_Y1CMDELE,_YCMDELE,_Y1CMDELE,_Y2VSEL,S,LOC,Z,0.00425,0.0044SMRT,7FLST,5,3,6,ORDE,3FITEM,5,216FITEM,5,242FITEM,5,-243CM

22、,_Y,VOLUVSEL,P51XCM,_Y1,VOLUCHKMSH,VOLUCMSEL,S,_YVMESH,_Y1CMDELE,_YCMDELE,_Y1CMDELE,_Y2SMRT,8CM,_Y,VOLUVSEL,245CM,_Y1,VOLUCHKMSH,VOLUCMSEL,S,_YVMESH,_Y1CMDELE,_YCMDELE,_Y1CMDELE,_Y2VSEL,S,LOC,Z,0.00505,0.02CM,_Y,VOLUVSEL,249CM,_Y1,VOLUCHKMSH,VOLUCMSEL,S,_YVMESH,_Y1CMDELE,_YCMDELE,_Y1CMDELE,_Y2VSEL,S

23、,LOC,Z,0.0034,0.0036FLST,5,2,6,ORDE,2FITEM,5,195FITEM,5,244VSEL,U,P51XSMRT,6FLST,5,59,6,ORDE,6FITEM,5,176FITEM,5,-194FITEM,5,196FITEM,5,-215FITEM,5,217FITEM,5,-236CM,_Y,VOLUVSEL,P51XCM,_Y1,VOLUCHKMSH,VOLUCMSEL,S,_YVMESH,_Y1CMDELE,_YCMDELE,_Y1CMDELE,_Y2VSEL,S,LOC,Z,0.0015,0.0019SMRT,7FLST,5,169,6,ORD

24、E,2FITEM,5,7FITEM,5,-175CM,_Y,VOLUVSEL,P51XCM,_Y1,VOLUCHKMSH,VOLUCMSEL,S,_YVMESH,_Y1CMDELE,_YCMDELE,_Y1CMDELE,_Y2ALLSEL,ALLVSEL,S,LOC,Z,0.0035，0.00425VSEL,S,LOC,Z,0.0036,0.00425ASEL,S,EXTFLST,5,65,5,ORDE,65FITEM,5,17FITEM,5,21FITEM,5,30FITEM,5,32FITEM,5,36FITEM,5,38FITEM,5,719FITEM,5,723FITEM,5,727F

25、ITEM,5,730FITEM,5,735FITEM,5,739FITEM,5,743FITEM,5,747FITEM,5,751FITEM,5,755FITEM,5,759FITEM,5,763FITEM,5,767FITEM,5,771FITEM,5,775FITEM,5,779FITEM,5,783FITEM,5,787FITEM,5,791FITEM,5,799FITEM,5,803FITEM,5,807FITEM,5,811FITEM,5,815FITEM,5,819FITEM,5,823FITEM,5,827FITEM,5,831FITEM,5,835FITEM,5,839FITE

26、M,5,843FITEM,5,847FITEM,5,851FITEM,5,855FITEM,5,859FITEM,5,863FITEM,5,867FITEM,5,871FITEM,5,875FITEM,5,883FITEM,5,887FITEM,5,891FITEM,5,895FITEM,5,899FITEM,5,903FITEM,5,907FITEM,5,911FITEM,5,915FITEM,5,919FITEM,5,923FITEM,5,927FITEM,5,931FITEM,5,935FITEM,5,939FITEM,5,943FITEM,5,947FITEM,5,951FITEM,5

27、,955FITEM,5,959ASEL,U,P51X/SOLUFLST,2,4,5,ORDE,4FITEM,2,15FITEM,2,19FITEM,2,23FITEM,2,1066/GOSFA,P51X,1,CONV,240,240FLST,2,8,5,ORDE,8FITEM,2,29FITEM,2,31FITEM,2,33FITEM,2,35FITEM,2,37FITEM,2,39FITEM,2,1064FITEM,2,-1065/GOSFA,P51X,1,CONV,250,250VSEL,S,LOC,Z,0.00505,0.02ALLSEL,ALLVSEL,S,LOC,Z,0.00505,

28、0.02ASEL,S,EXTFLST,5,2,5,ORDE,2FITEM,5,1045FITEM,5,1069ASEL,U,P51XALLSEL,ALLVSEL,S,LOC,Z,0.00505,0.02ASEL,S,EXTFLST,5,3,5,ORDE,3FITEM,5,14FITEM,5,1067FITEM,5,1069ASEL,U,P51XASEL,U,1068FLST,2,50,5,ORDE,17FITEM,2,995FITEM,2,997FITEM,2,1000FITEM,2,1003FITEM,2,-1007FITEM,2,1009FITEM,2,-1013FITEM,2,1015FITEM,2,-1019FITEM,2,1021FITEM,2,-1025FITEM,2,1027FITEM,2,-1031FITEM,2,1033FITEM,2,-1037FITEM