IGBT模块应用中的寿命和可靠性Word格式文档下载.docx
《IGBT模块应用中的寿命和可靠性Word格式文档下载.docx》由会员分享,可在线阅读,更多相关《IGBT模块应用中的寿命和可靠性Word格式文档下载.docx(14页珍藏版)》请在冰豆网上搜索。
Testmethod:
Selfheatingbyload,T_cycle≤3seconds,measureΔTvj
失效判据:
饱和压降Vcesat增大+5%
Failurecriteria:
Vcesatincreasemorethan5%
温度周次Thermalcycling
温度周次用于评估DCB下焊接层的寿命
ThermalcyclingcanestimateDCBsolder’slifetime
通电加热,周期5分钟,测量ΔTc
Selfheatingbyload,5min/,measureΔTc
热阻Rthjc增大+20%
R_thjcincrease20%
失效机理是两种材料不同的膨胀系数
(Differentmaterial’sCTE)[ppm/K]
不同应用下IGBT模块的寿命
LifetimeofIGBTmoduleindifferentapplication
Therearemanyapplicationsandsimilartypesofpowermodules.
Mainobjectiveis:
howtoselectanactivedeviceinordertoreachdesiredsystemlifetime?
Isitpossibletohavepowermodulesuitingtoallapplications?
由周期内系统工况变化获得温度变化
Getthetemperatureprofilebypowerprofileinacycle
温度变化导致的失效模式
FailuremodeswithΔT
Therearetwokeyfactorsintheselectionoftheappropriatepowermodule:
1)thermal:
Tvjop<
Tvjmax
2)reliability:
wearoutmechanismswhichdeterminemodulelifetimeasresultofmodule
reliabilitycurvesandthermalstresses
Note:
RBSOAandotherelectricalphenomenaarenotcoveredinthepresentation.
Factorsandimpacts:
1)TjFWDmax≤Tvjop
TjIGBTmax≤Tviop
NowadaysTvjop=150°
C
2)DTjFWD&
DTjIGBTrefertoPowerCyclingreliabilitycurves
ΔTCreferstoThermalCyclingreliabilitycurves
Reliabilitycurvesarealwaysgivenbypowermodulemanufacturer
绑定线老化——功率周次曲线
Bondwiredegradation–PCcurve
功率周次曲线修正因数
PCcurvecorrectionfactor
基板焊层老化——热循环曲线
Solderonbaseplatedegradation–TCcurve
功率温度循环(PC)次数评估计算
No.ofcycleestimationcalculationwithPowercyclingcurve
实例:
稳态周期系统的寿命估算
Simplemissioncycle--exampleoflifetimeestimation
Forrelativesimplemissioncyclesthemodulelifetimebasedonthethreepresentedreliability
curvesandpowerlossesconvertedintoajunctionandcasetemperatureswingcanbeeasily
estimated.PrimePACK™moduleinuse:
FF900R12IP4D
Questionfromlastpage:
howtoestimatethepowermodulelifetimeunderthemissioncycle,
hastoberepeatedagain.Let’scalculatethemodulewearoutasafunctionofmissioncycleandtime.
Finallifetimemoduleestimation:
wearout/year=0,3%+5.8%+4,38ppm+8,76ppm≌6.1%
Asreliabilitycurvesaregivenfor100%lifetimethemodulecanworkintheexampleapplication
for:
100%/6.1%≌16.4years
ThesecalculationsaremadeforIGBTonly.FWDhastobecalculatedseparately.
动态负载周期的寿命估算方法
Dynamicloadcycle–lifetimeestimate
MatlabcalculateslossesforgivennumberoftheloadcyclesandappliesthemtothethermalnetworksspecificforselectedmoduleinSimulink.AsaresultthejunctiontemperatureprofileforIGBT,Diodeandtheprofileofthesoldertemperatureisobtained.
Inthatcase,thesimulationwillbestopped.Overthegraphtheinformationsays,whichelementhashighertemperaturethanallowed.Ifitsbelow..
雨流计数法---随机负载谱转化为变幅或恒幅的负载谱
•把负载变化周次种类减少
•根据有限的试验数据推算整个寿命周期的变化规律,获得典型谱
Fromthetemperatureprofileanalysisthelifetime(andwearofthelifetimein%)foreachelementandsolderwillbecalculated.ThegraphswillshowthelifetimewearforeachdeltaT.Thesumofthepercentsiscalculatedandalsoshownonthegraph.
IGBT4模块的性能提升
HighperformanceofIGBT4module
IGBT4模块的150度最高允许工作结温,源于内部焊线工艺的改进,使其可靠性指标-功率周次(PC)数大幅增加!
铜绑定线CopperBondingWire--EconoDUAL™3600A
真正实现EconoDUAL™3最大输出电流能力
---@TC=100°
C,Tvj=175°
降低引线电阻RCC‘EE‘
保证功率周次,满足风力发电,电动汽车需求
提供焊接/PressFIT两种兼容版本
提供650V,1200V,1700VIGBT4全系列,便于现有设计的功率升级
PressFIT端子压接技术
Press+FIT=PressFIT
PressFITTechnology
无铅以达到RoHS环保要求
简易无焊接安装节约生产组装的成本和时间
高可靠性减少工人焊接端子中失误导致的过温和静电损坏
可靠性已在多个高端客户的产品中得到验证
超声波焊接的功率端子Ultrasonicweldedterminals
功率端子采用超声波焊接
Internalterminalconnectionsultrasonicwelded
-可增加模块端子的鲁棒性Increasedmechanicalrobustness
-可增加模块端子电流通过能力Higherterminalcurrentspossible
-无焊料可增加热传导能力maximumtemperatureevenreduced
已应用在以下的模块封装中:
PrimePACK,IHM-BTractionseries,EconoPACK™4
模块基板和衬底材料的选择以提高温度周次