开关电源传导电磁干扰建模分析

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1、万方数据西南交通大学硕士研究生学位论文第1I页AbstractTheSwitchingModePowerSupply(SMPS)iswidelyusedinindustry,military,medicalandotherfields．WheneitherswitchingfrequencyorpowerdensityofSMPSisincreasing，theElectromagneticCompatibility(EMC)problemscannotbeignored．TheElectromagneticInte

2、rference(EMI)problemsofSMPSareimminentlyundersolution，especially,fortheequipmentwimhighpowerorlargevoltage．TheConductedElectromagneticInterference(EMI)generatedinSMPScanpropagatealongthelineandcoupleintothepowergddorotherdevices，whichmaybreaksensitivedevicesdow

3、n．Therefore，conductedEMImodelingforSMPShaveagoodsignificanceonmechanismanalysisandsuppressionofconductedEMI．Inthispaper,aBoostconverteriSresearchedinthefieldsofconductedEMImeasurementandmodeling，andasimulationcircuitforconductedEMIoftheSMPSiSbuiltup·Firstly,wer

4、esearchthemeasurementtechnologyofConductedElectromagneticInterference．TheseparationmethodsforCommonMode(CM)andDifferentialMode(DM)interferenceareespeciallyfocusedon．Twonovelnoiseseparationtechnologiesareproposed，thefirstiSanoiseseparationnetworkforCMandDMinterf

5、erencebasedonCommonModeChoke(CMC)．ThecoreelementsofthedesignednoiseseparationnetworkareaRFtransformerandtwoCMC，whosecharacteristicimpedanceequals100Q．Thenoiseseparationnetworkhasagoodsimulationperformanceatthefrequencyrangefrom150kHz-30MHz．ThesecondiSanoisesepa

6、rationmethodbasedoncurrentprobemeasurementandsoftwarecomputation，whichisverifiedbymeasuringtheEMIofa15．0w／12Vcommercialswitchpowersupply．Theproposednoiseseparationmethodworksateithertheinputpowerlinesorthelinesbetweentwodevices．Ontheotherhand，wehavemeasuredthec

7、onductedEMIforthedesignedBoostSMPS．Atthefrequencyrangefrom150kHz-30MHz，themeasurementresultsshowtheconductedEMIspectraonphaselineandnaturallinehaveacoincidenceatpeakvalue，whicharebeyondtheBClasslimitsinCISPR22．AndtheCMinterferenceisapproximately10dBmorethantheD

8、M．AconclusionabouttheCMinterferenceiSindomainfortheconductedEMIofthepowerlinesiSmade．Secondly,accordingtothethreeelementsofEMC，webuilduptheconductedEMImodelfortheBoostSMPS．M