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ID:57301951
大小:843.92 KB
页数:21页
时间:2020-08-10
《功率损耗和温度的估算.pdf》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、IGBTlossesandthermalIFXAIMZhouYizhengPowerLossofIGBTModulesPowerlossofanIGBTmodulecomprisesthelossofthechips&chip-terminalconnection.ThemainlossesarefromtheIGBT&FWD.IGBTgeneratespowerlossbecauseof:1)Thesaturationvoltage–Vcesatinconductionstate;2)Theswitchingenergy–Eon&Eoffdur
2、ingswitchingtransients;3)Theleakagecurrent–Icesinblockingstate.FWDalsogeneratespowerlossesbecauseof:1)Forwardvoltage–Vfinforwardconduction(free-wheeling);2)Reverse-recoveryenergy–Erecduringthereverse-recoverytransient;3)Switch-onenergyduringtheswitch-ontransient.Vcesat,Eon,Eo
3、ff,Vf&ErecarecharacteristicvaluesofIGBTandFWDchips.DifferentchiptechnologiespresentdifferentVcesat,Eon,Eoff,Vf&Erecvalues.ForinternaluseonlyPage2ValuestocalculateMaximumvirtualjunctiontemperatures¬TocomparewithmaximumTvjopofdeviceVariationofvirtualjuctiontemperaturewithtime¬T
4、oprovideinputforlifetimecalculationregardingpowercycling–BondwireliftoffVariationofcasetemperaturewithtime¬Tosettherightover-temperatureprotectionpointForinternaluseonlyPage3InputdatarequiredDevicedataForwardvoltagedropSwitchingenergy¬DC-linkanddriveractuallyused!Thermalre
5、sistanceorthermalimpedanceHeatsinkandTIMdata,ifheatsinkisalreadychoosenApplicationdataWhichcombination(s)ofoperatingparameterswilloccure¬Switchingfrequency,modulationstrategy¬Current:sinusoidalordistorted?¬Powerfactor¬Overloadconditions?¬Fundamentalfrequency¬Modulationfactor
6、ForinternaluseonlyPage4VoltageparametersSaturationvoltage(V)CEsatVisspecifiedatnominalcurrent,bothT=25℃and125℃aregivenCEsatjInfineonIGBTareallpositivetemperaturecoefficientGoodforparallelingVvalueistotallyatchipCEsatlevel,excludingleadresistanceForinternaluseonlyPage5Voltagepa
7、rametersVincreasewithIincreasingCEsatCVincreasewithVdecreasingCEsatGEVisnotrecommendedtousetoosmall,ThisincreasesIGBTbothGEForinternaluseonlyconductionandswitchinglossesPage6VoltageparametersVvalueisusedtocalculateconductionlossesCEsatVVR*ICET0CECVCEVCE(2)VCE(1)RCEIIIΔI
8、CC(2)C(1)CBasicdataforconductionlossescalculationRCEΔV
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