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Chapter1DC-DCconverter§1-1BuckConverter§1-2BoostConverter§1-3Buck-BoostConverter§1-4CukConverter§1-5SepicZetaConverter§1-6Multi-QuadrantConverter§1-7DC-DCconverterwithisolatedtransformerForwardConverterFlybackConverterRoyerConverter
Thesupposedconditions:1、switchingdevices--ideal2、L、C--lossless3、impedanceofsourceUi--zero4、fsfc(switchfrequency)(cut-offfrequency)
§1-1BuckRegulator(Converter)Inductancecurrent:1continuous2critical3discontinuousVoltageripple
Differentstatesofinductancecurrent1★continuousstateinsteadycase:——DCtransformerwithdown-voltage——V.sbalanceprinciple
★criticalstateincrementalcurrentofL:criticalcurrentofL:Note:maintainI0tobeconstant
★discontinuousstate:WhatistheruleofDforUO?outputcurrentnamelyaveragecurrent
Outputvoltageripplesuppose:insteadyandcontinuousstate△IO→C、IO→R而IL=IO2
simulation3example:calculatecriticalinduction;calculatevoltageripple;criticalinduction:250uHvoltageripple:0.332V(300uH470uF);3.32V(300uH47uF)Buck02Buck03Buck01
simulation3explain
§1-2BoostConverterinductioncurrent:continuouscriticaldiscontinuousvoltageripple:
Differentstatesofinductioncurrent1★currentcontinuousstateinsteadycase:——DCtransformerwithup-voltage
★currentcriticalstateinductancecurrentincrementcapacitorcurrentincrement
★currentdiscontinuousstateInputcurrentprotectOutputvoltageprotectcomparewithcontinue
Outputvoltageripplesuppose:steadyandcontinue△IO→C、IO→R2
3example:Ui=12~36V,Uo=48V,Pomax=120W,fs=50kHz。Select“L”fordiscontinuestate。(norelationwithUi)
simulation4Boost1Boost1D=0.75Boost3D=0.50Boost2Boost3Boost2D=0.25fS=50kHz
§1-3Buck-BoostConverterBuck-BoostConverterB-B.Converter=BuckandBoostinseries
continuous
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