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1、ElectricalEngineeringinJapan,Vol.139,No.2,2002TranslatedfromDenkiGakkaiRonbunshi,Vol.120-D,No.11,November2000,pp.13761381MeasurementoftheSourceImpedanceofConductedEmissionUsingModeSeparableLISN:ConductedEmissionofaSwitchingPowerSupply111JUNICHIMIYASHITA,MASAYUKIMITSUZAWA,TOSHIYUKIKA
2、RUBE,22KIYOHITOYAMASAWA,andTOSHIROSATO1PrecisionTechnologyResearchInstituteofNaganoPrefecture,Japan2ShinshuUniversity,JapanSUMMARYlar,thepropagationofconductednoisemustbeinvesti-gated.Intheprocedureforreducingconductedemissions,Modelingandanalysisofequivalentcircuitshaveitishelpfult
3、oknowthenoisesourceimpedance.Thispaperbeencarriedoutinordertoinvestigateconductednoisepresentsamethodofmeasuringnoisesourcecomplexcausedbyswitching[1,2].However,thestraycapacitanceimpedancesofcommonanddifferentialmodeseparately.andothercircuitparametersofeachdevicemustbeknownWepropo
4、sealineimpedancestabilizationnetwork(LISN)inordertodevelopanequivalentcircuit,whichisnottomeasurecommonanddifferentialmodenoiseseparatelypracticableinthefieldofnoiseremoval.Ontheotherhand,withoutchangingLISNimpedancesofeachmode.Withnoisefiltersandothernoise-removaldevicesdonotactual
5、lythisLISN,conductedemissionsofeachmodearemeasuredprovidetheexpectedeffect[3,4],whichisexplainedbytheinsertingappropriateimpedancesattheequipmentunderdifferencebetweenthestaticcharacteristicsmeasuredatantest(EUT)terminaloftheLISN.Noisesourcecompleximpedanceof50W,andtheactualimpedanc
6、e.Thus,itisimpedancesofswitchingpowersupplyarewellcalculatednecessarytoknowthenoisesourceimpedanceinordertofrommeasuredresults.©2002ScriptaTechnica,ElectrEnganalyzetheconductednoise.Jpn,139(2):7278,2002;DOI10.1002/eej.1154Regulationsonthemeasurementofnoiseterminalvoltage[5]suggestus
7、ingLISN;inparticular,thevectorsum(absolutevoltage)oftwopropagationmodes,namely,Keywords:Conductedemission;noiseterminalcommonmodeanddifferentialmode,ismeasuredintermsvoltage;noisesourceimpedance;lineimpedancestabiliza-ofthefrequencyspectrum.Suchameasurement,however,tionnetwork(LISN)
8、;EMI.doesnotprovide
