电力电子技术第5版 教学课件 作者 王兆安 Chapter 09.ppt

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1、PowerElectronicsChapter9PracticalApplicationIssuesofPowerSemiconductorDevicesOutline9.1Gatedrivecircuit9.2Protectionofpowersemiconductordevices9.3Seriesandparallelconnectionsofpowersemiconductordevices9.1GatedrivecircuitBasicfunctionofgatedrivecircuit:Generategatesignalstoturn-onort

2、urn-offpowersemiconductordeviceaccordingtothecommandingsignalsfromthecontrolcircuit.Otherfunctionsofgatedrivecircuit:Reduceswitchingtime(includingturn-ontimeandturn-offtime)Reduceswitchingloss(includingturn-onlossandturn-offloss)andimproveefficiencyImproveprotectionandsafetyoftheconv

3、erterGatedrivecircuitsprovidedbypowersemiconductormanufacturersandIntegratedgatedrivechipsaremoreandmorewidelyused.ElectricalisolationinthegatedrivecircuitGatedrivecircuitusuallyprovidestheelectricalisolationbetweencontrolcircuitandpowerstage.TwowaystoprovideelectricalisolationOptica

4、lOptocoupler,fiberopticsTransformerMagneticSchematicofanoptocouplerThyristorgatecurrentpulserequirmentsShapeofgatecurrentpulsewaveform:EnhancedleadingpartMagnituderequirement(fortheenhancedleadingpartandtheotherpart)Widthrequirement(fortheenhancedleadingpartandthewholepulse)Powerofth

5、etriggeringsignalmustbewithintheSOAofthegateI-VcharacteristicsIdealgatecurrentpulsewaveformforthyristorsTypicalthyristorgatetriggeringcircuitTypicalgatesignalandgatedrivecircuitforGTOAtypicalgatedrivecircuitforIGBTbasedonanintegrateddriverchipM57962Lintegrateddriverchip9.2Protectiono

6、fpowersemiconductor　　devicesProtectioncircuitsOvervoltageprotectionOvercurrentprotectionSnubbercircuits—specificprotectioncircuitsthatcanlimitdu/dtordi/dtTurn-onsnubberTurn-offsnubberCausesofovervoltageonpowersemiconductordevicesExternalreasonsOvervoltagecausedbyoperationofmechanicsw

7、ithesOvervoltagecausedbythunderlighteningInternalreasonsOvervoltagecausedbythereverserecoveryofdiodeorthyristorOvervoltagecausedbytheturning-offoffully-controlleddevicesMeasurestoprotectpowersemiconductordevicesfromovervoltageLighteningarrestorRCorRCDsnubbers(willbediscussedlater)Zen

8、erdiode,Meta