开关电源毕业论文外文翻译要点

中英文翻译学院名称：电气信息工程学院专业：电气工程及其自动化班级：学号：姓名：指导教师姓名：指导教师职称：二〇一四年六月本科毕业设计（论文）第1页共13页外文资料（原文）Modeling,Simulation,andReductionofConductedElectromagneticInterferenceDuetoaPWMBuckTypeSwitchingPowerSupplyIA.FarhadiAbstract:UndesiredgenerationofradiatedorconductedenergyinelectricalsystemsiscalledElectromagneticInterference(EMI).HighspeedswitchingfrequencyinpowerelectronicsconvertersespeciallyinswitchingpowersuppliesimprovesefficiencybutleadstoEMI.Differentkindofconductedinterference,EMIregulationsandconductedEMImeasurementareintroducedinthispaper.CompliancywithnationalorinternationalregulationiscalledElectromagneticCompatibility(EMC).PowerelectronicsystemsproducersmustregardEMC.ModelingandsimulationisthefirststepofEMCevaluation.EMIsimulationresultsduetoaPWMBucktypeswitchingpowersupplyarepresentedinthispaper.ToimproveEMC,sometechniquesareintroducedandtheireffectivenessprovedbysimulation.IndexTerms:Conducted,EMC,EMI,LISN,SwitchingSupplyI.INTRODUCTIONFASTsemiconductorsmakeitpossibletohavehighspeedandhighfrequencyswitchinginpowerelectronics1.Highspeedswitchingcausesweightandvolumereductionofequipment,butsomeunwantedeffectssuchasradiofrequencyinterferenceappeared2.Compliancewithelectromagneticcompatibility(EMC)regulationsisnecessaryforproducerstopresenttheirproductstothemarkets.ItisimportanttotakeEMCaspectsalreadyindesignphase3.ModelingandsimulationisthemosteffectivetooltoanalyzeEMCconsiderationbeforedevelopingtheproducts.Alotofthepreviousstudiesconcernedthelowfrequencyanalysisofpowerelectronicscomponents45.DifferenttypesofpowerelectronicsconvertersarecapabletobeconsideredassourceofEMI.TheycouldpropagatetheEMIinbothradiatedandconductedforms.LineImpedanceStabilizationNetwork(LISN)isrequiredformeasurementandcalculationofconductedinterferencelevel6.InterferencespectrumattheoutputofLISNisintroducedastheEMCevaluationcriterion78.NationalorinternationalregulationsarethereferencesfortheevaluationofequipmentinpointofviewofEMC78.中英文翻译第2页共13页II.SOURCE,PATHANDVICTIMOFEMIUndesiredvoltageorcurrentiscalledinterferenceandtheircauseiscalledinterferencesource.Inthispaperahigh-speedswitchingpowersupplyisthesourceofinterference.Interferencepropagatedbyradiationinareaaroundofaninterferencesourceorbyconductionthroughcommoncablingorwiringconnections.Inthisstudyconductedemissionisconsideredonly.Equipmentsuchascomputers,receivers,amplifiers,industrialcontrollers,etcthatareexposedtointerferencecorruptionarecalledvictims.Thecommonconnectionsofelements,sourcelinesandcablingprovidepathsforconductednoiseorinterference.Electromagneticconductedinterferencehastwocomponentsasdifferentialmodeandcommonmode9.A.DifferentialmodeconductedinterferenceThismodeisrelatedtothenoisethatisimposedbetweendifferentlinesofatestcircuitbyanoisesource.RelatedcurrentpathisshowninFig.19.Theinterferencesource,pathimpedances,differentialmodecurrentandloadimpedancearealsoshowninFig.1.B.CommonmodeconductedinterferenceCommonmodenoiseorinterferencecouldappearandimposebetweenthelines,cablesorconnectionsandcommonground.Anyleakagecurrentbetweenloadandcommongroundcouldbemodeledbyinterferencevoltagesource.中英文翻译第3页共13页Fig.2demonstratesthecommonmodeinterferencesource,commonmodecurrentsIcm1andIcm2andtherelatedcurrentpaths9.Thepowerelectronicsconvertersperformasnoisesourcebetweenlinesofthesupplynetwork.Inthisstudydifferentialmodeofconductedinterferenceisparticularlyimportantanddiscussionwillbecontinuedconsideringthismodeonly.III.ELECTROMAGNETICCOMPATIBILITYREGULATIONSApplicationofelectricalequipmentespeciallystaticpowerelectronicconvertersindifferentequipmentisincreasingmoreandmore.Asmentionedbefore,powerelectronicsconvertersareconsideredasanimportantsourceofelectromagneticinterferenceandhavecorruptingeffectsontheelectricnetworks2.Highlevelofpollutionresultingfromvariousdisturbancesreducesthequalityofpowerinelectricnetworks.Ontheothersidesomeresidential,commercialandespeciallymedicalconsumersaresosensitivetopowersystemdisturbancesincludingvoltageandfrequencyvariations.ThebestsolutiontoreducecorruptionandimprovepowerqualityiscomplyingnationalorinternationalEMCregulations.CISPR,IEC,FCCandVDEareamongthemostfamousorganizationsfromEurope,USAandGermanywhoareresponsiblefordeterminingandpublishingthemostimportantEMCregulations.IECandVDErequirementandlimitationsonconductedemissionareshowninFig.3andFig.479.Fordifferentgroupsofconsumersdifferentclassesofregulationscouldbecomplied.ClassAforcommonconsumersandclassBwithmorehardlimitationsforspecialconsumersare中英文翻译第4页共13页separatedinFig.3andFig.4.FrequencyrangeoflimitationisdifferentforIECandVDEthatare150kHzupto30MHzand10kHzupto30MHzrespectively.Complianceofregulationsisevaluatedbycomparisonofmeasuredorcalculatedconductedinterferencelevelinthementionedfrequencyrangewiththestatedrequirementsinregulations.InunitedEuropeancommunitycomplianceofregulationismandatoryandproductsmusthavecertifiedlabeltoshowcoveringofrequirements8.IV.ELECTROMAGNETICCONDUCTEDINTERFERENCEMEASUREMENTA.LineImpedanceStabilizationNetwork(LISN)中英文翻译第5页共13页1-