现代电力电子技术课件1Chapter4-part 1.ppt

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1、Chapter4.ConverterCircuits4.1Circuitmanipulations4.2Ashortlistofconverters4.3.Transformerisolation4.4.Converterevaluationanddesign6.5.SummaryofkeypointsWheredotheboost,buck-boost,andotherconvertersoriginate?Howcanweobtainaconverterhavinggivendesiredproperties?Whatconvertersarepossible?Ho

2、wcanweobtaintransformerisolationinaconverter?Foragivenapplication,whichconverterisbest?14.1Circuitmanipulations输入-输出功率的双向流动•Switchchangesdccomponent,low-passfilterremovesswitchingharmonics•ConversionratioisM=DBuckConverteer24.1.1.InversionofsourceandloadInterchangepowerinputandoutputport

3、sofaconverterV2=DV13InversionofsourceandloadInterchangepowersourceandload:4RealizationofswitchesInversionofbuckconverteryieldsboostconverterReversalofpowerflowrequiresnewrealizationofswitchesTransistorconductswhenswitchisinposition2InterchangeofDandD’5BoostConverterRealizationofswitchesI

4、nversionofbuckconverteryieldsboostconverter64.2Cascadeconnectionofconverters变换器级联7Example:buckcascadedbyboost8Buckcascadedbyboost:simplificationofinternalfilterremovecapacitorC1combineinductorsL1andL2Noninvertingbuck-boostconverter9invertingbuck-boostReductionofnumberofswitches:Reversalo

5、foutputvoltagepolarity10invertingbuck-boostReductionofnumberofswitches:Reversalofoutputvoltagepolarity11Reductionofnumberofswitches:invertingbuck-boost12Discussion:cascadeconnections•Propertiesofbuck-boostconverterfollowfromitsderivationasbuckcascadedbyboostEquivalentcircuitmodel:buck1:D

6、transformercascadedbyboostD’:1transformerPulsatinginputcurrentofbuckconverterPulsatingoutputcurrentofboostconverter•OthercascadeconnectionsarepossibleCukconverter:boostcascadedbybuck134.3DifferentialconnectionofloadtoobtainbipolaroutputvoltageBuckInputPositiveOutputPositiveBoostInputPosi

7、tiveOutputPositiveBuck-BoostInputPositiveOutputNegativeCukInputPositiveOutputNegative144.3Differentialconnectionofloadtoobtainbipolaroutputvoltage15Differentialconnectionusingtwobuckconverters164.3ConversionratioM(D),differentially-connectedbuckconverters174.3Simplificati