SEMIKRON IGBT驱动电路解析.ppt

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1、IGBTGateDriverCalculationGateDriverRequirementWhatisthemostimportantrequirementforanIGBTdriver?GatePeakcurrentConditionsforasafetyoperationWhichgatedriverissuitableforthemoduleSKM200GB128D?Designparameters:fsw=10kHzRg=?reverserecoverycurrentDiodeshouldbe-1.5xId

2、iodeby80degreecase130Ax1.5=195AGateresistorinrangeof“test–gateresistor”Howtofindtherightgateresistor?Rg=7OhmTwogateresistorsarepossibleforturnonandturnoffRon=7OhmRoff=10Ohm195A–maxreverserecoverycurrentDifferencebetweenTrench-andSPTTechnologyTrenchTechnologyneedsas

3、mallerGatechargeDriverhastoprovideasmallerGatechargeSPTTechnologyneedsmoreGatechargecomparedtoTrenchTechnologyDriverhastoprovideahigherGatechargeDriverperformance–differentIGBTtechnologiesneedsdifferentgatechargeTrenchIGBTwithsamechipcurrentGatechargeis2.3uCDriverp

4、erformance–differentIGBTtechnologiesneedsdifferentgatechargeSPTIGBTwithsamechipcurrentGatechargeis3uCDemandsforthegatedriverThesuitablegatedrivermustprovidetherequiredGatecharge(QG)–powersupplyofthedrivermustprovidetheaveragepowerAveragecurrent(IoutAV)–powersupplyG

5、atepulsecurrent(Ig.pulse)–mostimportantattheappliedswitchingfrequency(fsw)-8151390DeterminationofGateChargeGatecharge(QG)canbedeterminedfromfig.6oftheSEMITRANSdatasheetQG=1390nCThetypicalturn-onandturn-offvoltageofthegatedriverisVGG+=+15VVGG-=-8VCalculationoftheav

6、eragecurrentCalculationofaveragecurrent:IoutAV=P/UV=+Vg+[-Vg]withP=E*fsw=QG*V*fswIoutAV=QG*fsw=1390nC*10kHz=13.9mAAbsolutevaluePowersupplyrequirementsGatechargeThepowersupplyorthetransformermustprovidetheenergy(Semikronisusingpulsetransformerforthepowersupply,w

7、emustconsiderthetransformedaveragepowerfromthetransformer)AveragecurrentIsrelatedtothetransformerCalculationofthepeakgatecurrentExaminationofthepeakgatecurrentwithminimumgateresistanceE.g.RG.on=RG.off=7Ig.puls≈V/RG+Rint=23V/7+1=2.9APulsepowerratingofthegateresi

8、storPtotal–GateresistorPpulseGateresistor=IoutAVxVMoreinformation:Theproblemoccurswhentheuserforgetsaboutthepeakpowerratingofthegateresistor.The