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1、IGBT模块的原理、测量及判断ThispaperdealswithaninvertingmodulemadeofasingleIGBTtubeordoubletubeanditsmethodofmeasuringandjudgingthegoodorbad・TheIPMmoduleisnotwithinthescopeofthisarticle・Fieldeffecttransistorhastheadvantagesoffastswitchingspeedandvoltagecontrol,butitalsohasthedisadvantagesoflargeturn-o
2、nvoltagedropandlowvoltageandcurrentcapacity.Thebipolardevicehasitsoppositecharacteristics,suchascurrentcontrol,smallvoltagetransmission,largepowercapacity,etc・，thetwoarecomplex,theso-calledcomplementaryadvantages・IGBTpipe,ortheoriginoftheIGBTmodule,isbasedonthis・Structurally,itissimilartot
3、hecompoundamplifiertubethatweareallfamiliarwith・TheoutputtubeisaPNPtypetriode,andtheexcitationtubeisafieldeffecttransistor,andthedraincurrentofthelatterformsthebasecurrentoftheformer・Msgnificstionistheproductoftwotubes・TheequivalentcircuitsandsymbolsoftheIGBTpipeareasfollows:CommonlyusedIG
4、BTsingleanddoublemodule(CM200Y-24NF)pinfunctiondiagramisasfollows:PinfunctiondiagramofFP24R12KE3integratedmodule:Infrontofthemachine,measurementofthemoduleisgoodorbad,tocarryoutpreliminaryjudgment・Theabovediagramisasanexample:4,5and6terminalsaretheU,VandWoutputsoftheconverier,dnd22and24are
5、theP(+)terminalandtheN(-)terminaloftheDCmaincircuitoftheconverter・Whenyoufindthese5terminals,youcanmeasurethemwitheitheradigitalorapointertypemultimeter・TheU,VandWthreeterminalshavepositiveandreverseresistancetothePandNterminals・WhentheIGBTpipeisnormal,theresistancebetweenthepipeCandEisinf
6、inite・Onlythepositiveandreverseresistancesofthe6diodesinparallelcanbemeasured・Ifthe4,5and6terminalsareconsideredasthree-phaseACinputterminals,thesixdiodesareequivalenttoathree-phaserectifierbridgecircuit,andthemethodofmeasuringandjudgingthethree-phaserectifierbridgecanbedone・I.on-linemeasu
7、rement:1,measurementofthis"three-phaserectifierbridge"isnotnormal,thenthemoduleisdamaged;2,measuringthisthree-phaserectifierbridge^isnormal,andcannotbesurethatthemoduleisgood・Themaincircuitboardofthefrequencyconvertershouldbeopenedforfurthermeasurementandverif
