基于压降型PWM开关电源的建模仿真和减少传导性电磁干扰毕业论文外文文献翻译及原文.docx

基于压降型PWM开关电源的建模仿真和减少传导性电磁干扰毕业论文外文文献翻译及原文.docx

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基于压降型PWM开关电源的建模仿真和减少传导性电磁干扰毕业论文外文文献翻译及原文

毕业设计（论文）

外文文献翻译

文献、资料中文题目：

基于压降型PWM开关电源的

建模、仿真和减少传导性电磁干扰

文献、资料英文题目：

文献、资料来源：

文献、资料发表（出版）日期：

院（部）：

专业：

电气工程及其自动化专业

班级：

姓名：

学号：

指导教师：

翻译日期：

2017.02.14

本科毕业设计（论文）

中英文翻译

外文资料（原文）

Modeling,Simulation,andReductionofConductedElectromagneticInterferenceDuetoaPWMBuckTypeSwitchingPowerSupplyI

A.Farhadi

Abstract:

UndesiredgenerationofradiatedorconductedenergyinelectricalsystemsiscalledElectromagneticInterference（EMI）.HighspeedswitchingfrequencyinpowerelectronicsconvertersespeciallyinswitchingpowersuppliesimprovesefficiencybutleadstoEMI.Differentkindofconductedinterference,EMIregulationsandconductedEMImeasurementareintroducedinthispaper.CompliancywithnationalorinternationalregulationiscalledElectromagneticCompatibility（EMC）.PowerelectronicsystemsproducersmustregardEMC.ModelingandsimulationisthefirststepofEMCevaluation.EMIsimulationresultsduetoaPWMBucktypeswitchingpowersupplyarepresentedinthispaper.ToimproveEMC,sometechniquesareintroducedandtheireffectivenessprovedbysimulation.

IndexTerms:

Conducted,EMC,EMI,LISN,SwitchingSupply

I.INTRODUCTION

FASTsemiconductorsmakeitpossibletohavehighspeedandhighfrequencyswitchinginpowerelectronics

.Highspeedswitchingcausesweightandvolumereductionofequipment,butsomeunwantedeffectssuchasradiofrequencyinterferenceappeared

.Compliancewithelectromagneticcompatibility（EMC）regulationsisnecessaryforproducerstopresenttheirproductstothemarkets.ItisimportanttotakeEMCaspectsalreadyindesignphase

.ModelingandsimulationisthemosteffectivetooltoanalyzeEMCconsiderationbeforedevelopingtheproducts.Alotofthepreviousstudiesconcernedthelowfrequencyanalysisofpowerelectronicscomponents

.DifferenttypesofpowerelectronicsconvertersarecapabletobeconsideredassourceofEMI.TheycouldpropagatetheEMIinbothradiatedandconductedforms.LineImpedanceStabilizationNetwork（LISN）isrequiredformeasurementandcalculationofconductedinterferencelevel

.InterferencespectrumattheoutputofLISNisintroducedastheEMCevaluationcriterion

.NationalorinternationalregulationsarethereferencesfortheevaluationofequipmentinpointofviewofEMC

.

II.SOURCE,PATHANDVICTIMOFEMI

Undesiredvoltageorcurrentiscalledinterferenceandtheircauseiscalledinterferencesource.Inthispaperahigh-speedswitchingpowersupplyisthesourceofinterference.

Interferencepropagatedbyradiationinareaaroundofaninterferencesourceorbyconductionthroughcommoncablingorwiringconnections.Inthisstudyconductedemissionisconsideredonly.Equipmentsuchascomputers,receivers,amplifiers,industrialcontrollers,etcthatareexposedtointerferencecorruptionarecalledvictims.Thecommonconnectionsofelements,sourcelinesandcablingprovidepathsforconductednoiseorinterference.Electromagneticconductedinterferencehastwocomponentsasdifferentialmodeandcommonmode

.

A.Differentialmodeconductedinterference

Thismodeisrelatedtothenoisethatisimposedbetweendifferentlinesofatestcircuitbyanoisesource.RelatedcurrentpathisshowninFig.1

.Theinterferencesource,pathimpedances,differentialmodecurrentandloadimpedancearealsoshowninFig.1.

B.Commonmodeconductedinterference

Commonmodenoiseorinterferencecouldappearandimposebetweenthelines,cablesorconnectionsandcommonground.Anyleakagecurrentbetweenloadandcommongroundcouldbemodeledbyinterferencevoltagesource.

Fig.2demonstratesthecommonmodeinterferencesource,commonmodecurrentsIcm1andIcm2andtherelatedcurrentpaths

.Thepowerelectronicsconvertersperformasnoisesourcebetweenlinesofthesupplynetwork.Inthisstudydifferentialmodeofconductedinterferenceisparticularlyimportantanddiscussionwillbecontinuedconsideringthismodeonly.

III.ELECTROMAGNETICCOMPATIBILITYREGULATIONS

Applicationofelectricalequipmentespeciallystaticpowerelectronicconvertersindifferentequipmentisincreasingmoreandmore.Asmentionedbefore,powerelectronicsconvertersareconsideredasanimportantsourceofelectromagneticinterferenceandhavecorruptingeffectsontheelectricnetworks

.Highlevelofpollutionresultingfromvariousdisturbancesreducesthequalityofpowerinelectricnetworks.Ontheothersidesomeresidential,commercialandespeciallymedicalconsumersaresosensitivetopowersystemdisturbancesincludingvoltageandfrequencyvariations.ThebestsolutiontoreducecorruptionandimprovepowerqualityiscomplyingnationalorinternationalEMCregulations.CISPR,IEC,FCCandVDEareamongthemostfamousorganizationsfromEurope,USAandGermanywhoareresponsiblefordeterminingandpublishingthemostimportantEMCregulations.IECandVDErequirementandlimitationsonconductedemissionareshowninFig.3andFig.4

.

Fordifferentgroupsofconsumersdifferentclassesofregulationscouldbecomplied.ClassAforcommonconsumersandclassBwithmorehardlimitationsforspecialconsumersareseparatedinFig.3andFig.4.FrequencyrangeoflimitationisdifferentforIECandVDEthatare150kHzupto30MHzand10kHzupto30MHzrespectively.Complianceofregulationsisevaluatedbycomparisonofmeasuredorcalculatedconductedinterferencelevelinthementionedfrequencyrangewiththestatedrequirementsinregulations.InunitedEuropeancommunitycomplianceofregulationismandatoryandproductsmusthavecertifiedlabeltoshowcoveringofrequirements

.

IV.ELECTROMAGNETICCONDUCTEDINTERFERENCEMEASUREMENT

A.LineImpedanceStabilizationNetwork（LISN）

1-Providingalowimpedancepathtotransferpowerfromsourcetopowerelectronicsconverterandload.