电力电子技术英文版 chapter05

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1、PPoowwererEEllececttrronionicscsChapter5DCtoDCConverters(Choppers)OuOuttlliinene5.1BasicDCtoDCconverters5.2CompositeDC/DCconvertersandElectronicsconnectionofmultipleDC/DCconverters5.3IsolatedDCtoDCconverters(IndirectDCtoDCconverters)Power25.1BasicDCBasicDCtotoDCcDCcoonn

2、vveerrtteersrs5.1.1Buckconverter(Step-downconverter)5.1.2Boostconverter(Step-upconverter)Electronics5.1.3Buck-Boostconverter(Step-down/step-upconverter)andCukconverterPower5.1.4SepicconverterandZetaconverterPartoftheslidesofthissectionistakenandmodifiedfrom:R.Ericksonan

3、dD.Maksimovic.FundamentalsofPowerElectronics.KluwerAcademicPublishers,200135.1BasicDC5.1BasicDCtotoDCcDCcoonnvveerrtteersrsIntroduction—BuckconverterSPDTswitchchangesdccomponentElectronicsSwitchoutputvoltagewaveformDutycycleD:Power0£D£1complementD’:D’=1-D4Dccomponentofs

4、witchoutputvoltageElectronicsFourieranalysis:Dccomponent=averagevaluePower5Insertionoflow-passfiltertoremoveswitchingharmonicsandpassonlydccomponentElectronicsPower6BasicoperationprincipleofbuckconverterBuckconverterwithidealswitchElectronicsRealizationPowerusingpowerMO

5、SFETanddiode7ThoughtprocessinanalyzingbasicDC/DCconvertersBasicoperationprinciple(qualitativeanalysis)–Howdoescurrentflowduringdifferentswitchingstates–HowisenergytransferredduringdifferentswitchingstatesVerificationofsmallrippleapproximationElectronicsDerivationofinduc

6、torvoltagewaveformorcapacitorcurrentwaveformduringdifferentswitchingstatesQuantitativeanalysisaccordingtoinductorvolt-secondPowerbalanceorcapacitorchargebalance8ActualoutputvoltagewaveformofbuckconverterBuckconvertercontainingpracticallow-passfilterElectronicsActualoutp

7、utvoltagewaveformPowerv(t)=V+vripple(t)9Thesmallrippleapproximationv(t)=V+v(t)rippleElectronicsInawell-designedconverter,theoutputvoltagerippleissmall.Hence,thewaveformscanbeeasilydeterminedbyignoringtheripple:Power10Buckconverteranalysis:inductorcurrentwaveformElectron

8、icsPower11Inductorvoltageandcurrentsubinterval1:switchinposition1ElectronicsPower12Inductorvoltageandcurrentsu