磁芯资料讲解2.pdf

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1、Chapter2PrinciplesofSteady-StateConverterAnalysis2.1.Introduction2.2.Inductorvolt-secondbalance,capacitorchargebalance,andthesmallrippleapproximation2.3.Boostconverterexample2.4.Cukconverterexample2.5.Estimatingtherippleinconverterscontainingtwo-polelow-passfilters2.6.SummaryofkeypointsFund

2、amentalsofPowerElectronics1Chapter2:Principlesofsteady-stateconverteranalysis2.1IntroductionBuckconverter1++SPDTswitchchangesdccomponent2V+v(t)Rv(t)g–s––v(t)sVgSwitchoutputvoltagewaveformDTD'TssDutycycleD:00≤D≤10DTsTstSwitchcomplementD′:position:121D′=1-DFundamentalsofPowerElectronics2Chapt

3、er2:Principlesofsteady-stateconverteranalysisDccomponentofswitchoutputvoltagev(t)sVg〈v〉=DVarea=sgDTVsg00DTTtssFourieranalysis:Dccomponent=averagevalueTs1vs=vs(t)dtTs01vs=T(DTsVg)=DVgsFundamentalsofPowerElectronics3Chapter2:Principlesofsteady-stateconverteranalysisInsertionoflow-passfilterto

4、removeswitchingharmonicsandpassonlydccomponentL1++2Vg+v(t)CRv(t)–s––VVgv≈vs=DVg001DFundamentalsofPowerElectronics4Chapter2:Principlesofsteady-stateconverteranalysisThreebasicdc-dcconverters(a)1LM(D)=D10.8i(t)+L)0.62(DBuckV+CRvM0.4g–0.2–000.20.40.60.81D(b)L512M(D)=41–D+iL(t))31Boost(DVg+CRvM

5、2–1–000.20.40.60.81DD(c)00.20.40.60.81012+–1Buck-boosti(t))–2+LCRv(DVg–LM–3––4M(D)=–D1–D–5FundamentalsofPowerElectronics5Chapter2:Principlesofsteady-stateconverteranalysisObjectivesofthischapter
Developtechniquesforeasilydeterminingoutputvoltageofanarbitraryconvertercircuit
Derivetheprincip

6、lesofinductorvolt-secondbalanceandcapacitorcharge(amp-second)balance
Introducethekeysmallrippleapproximation
Developsimplemethodsforselectingfilterelementvalues
IllustrateviaexamplesFundamentalsofPowerElectronics6Chapter2:Principlesofsteady-stateconverteranalysis2.2.Inductorvolt-secondbalan

7、ce,capacitorchargebalance,andthesmallrippleapproximationActualoutputvoltagewaveform,buckconverteri(t)L1L+Buckconverter+vL(t)–i(t)Ccontainingpractical2low-passfilterV+CRv(t)g––Actualoutputvoltagev(t)Actualwaveformwaveformv(t)=V+vripple(t)Vv(t)=V+vripple(t