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1、IEEETRANSACTIONSONPOWERELECTRONICS,VOL.18,NO.6,NOVEMBER20031309ANewActiveCommon-ModeEMIFilterforPWMInverterYo-ChanSon,StudentMember,IEEE,andSeung-KiSul,Fellow,IEEEAbstract—Thispaperpresentsanewactivecommon-modeelec-toincreasetheinsertionloss,whichmakesthecommon-modetromagneti
2、cinterference(EMI)filterforthepulse-widthmodula-filterbulky.Manyresearchershavetriedtodevelopsomeac-tion(PWM)inverterapplication.Theproposedfilterisbasedontivefilteringtechniquesinordertoovercomesuchlimitationsthecurrentsensingandcompensationcircuitanditutilizesafast[8]–[12].
3、transistoramplifierforthecurrentcompensation.Theamplifierutilizesanisolatedlow-voltagedcpowersupplyforitsbiasingandInthispaper,anewactivecommon-modeEMIfilterisintro-itispossibletoconstructtheactivefilterindependentofthesourceducedinordertomitigatetheconductedcommon-modeEMI.vo
4、ltageoftheequipment.ThustheproposedactivefiltercanbeItcanprovidethesufficientattenuationunderthelimitedLCusedinanyapplicationregardlessofitsworkingvoltage.Theeffec-productandthereisapromisingpossibilityofitsapplicationtivenessoftheproposedcircuithasbeenverifiedbyexperimentalr
5、egardlessoftheworkingvoltageofthesystem.Itsanalysisandresults.experimentalverificationwillbegiveninthispaper.IndexTerms—Common-mode,EMI,inverter,PWM,transistoramplifier.II.ACTIVECOMMON-MODEEMIFILTERFig.2showsthebasicconceptoftheproposedactiveI.INTRODUCTIONcommon-modeEMIfilter
6、(ACEF).ThecircuitisbasedontheHEPWMinverterasshowninFig.1,istheinherentnoisetopologyusingthecurrentsensingandcompensation[8],[9],Tsourcethatmakesabruptvoltagetransitions(high)[11],[12].ThenoisesourceisthePWMinverterinFig.2andaccompaniedbyswitchingactions[1],[2].Coupledwiththet
7、heinputfiltercanbeanadditionalpassivefilter,whichgivesstraycapacitanceoftheloadmachinethehighfrequencycurrentadditionalinsertionloss.Theseries-connectedcommon-modeisgenerated,whichcanaffecttheoperationofnearbyequip-chokeworksasthecommon-modecurrentsensingele-mentsduetothecond
8、uctedandradiatedelectromagneticinter-mentbytheadditionalwinding.Theh
