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BoostInterleavedPFCversusBridgelessBoostInterleavedPFCConverterPerformance/EfficiencyAnalysisMihaela-CodrutaANCUTI*,MarcusSVOBODA*,SorinMUSUROI*,AlexandruHEDES*,DepartmentofElectricalEngineering,UniversityPolitehnicaofTimisoara,Timisoara,Romaniacodruta-m.ancuti@upt.ro,marcus.svoboda@upt.ro,sorin.musuroi@upt.ro,alexandru.hedes@upt.roNicola-ValeriuOLARESCU**,MartinWienmann**AKO-DIEHLControls,Munchen,Germany,nicola.olarescu@diehl-controls.com,martin.wienmann@diehl-controls.comAbstract—Inthelasttwodecades,agreatpartofresearchinthepowerelectronicsareahasbeeninvolvedinfindingmethodsofimprovingtheinputcurrentwaveformwhilesimultaneouslyavoidingphasedisplacement.Theaimofthepaperconsistsofselectingtwoofthemostrelevantsinglephasepowerfactorcorrection(PFC)topologiescurrentlyexistingforthepowerrangeof1.5kWupto4kWandtoanalyseandevaluatethem.TheinvestigatedtopologiesaretheboostinterleavedPFCconverterandthebridgelessboostinterleavedPFCconverter.PerformancesofthetwostudiedtopologiesaresimulatedinMatlab/Simulink.Lossanalysisandefficiencyevaluationarealsoprovided.ThesimulationresultsverifythatthebridgelessboostinterleavedPFCconverterdemonstratesaslightlyhigherefficiencythantheinterleavedboostPFCconvertertopology.Keywords—boostinterleavedconverter,bridgelessboostinterleavedconverter,powerfactorcorrection(PFC)I.INTRODUCTIONForsingle-phaselowpowerapplications,PowerFactorCorrection(PFC)convertersaredesignedinordertoensureahighpowerfactoratthemainsside,andtoemulateapurelyresistiveoperationofthediodebridge-basedfront-endrectifier.Onemajordrawback,relatedtothePFCcircuits,isthattheyinvolveadditionallosses,thusreducingtheoverallefficiency.ThePFCsolutionscanbecategorizedaspassiveoractive,[1]-[2].ForpassivePFC,onlypassiveelementsareusedinadditiontothediodebridgerectifier,toimprovetheshapeofthelinecurrent.Obviously,theoutputvoltageisnotcontrollable.EventhoughthepassivePFCconvertersaresimple,,theirdisadvantagesmakethemnotbeingsuitableforindustrialapplicationsbecausetheydemonstratepoordynamicresponse,lackofvoltageregulation,theshapeofinputcurrentdependontheload,thusthepowerfactorisreduced.ForactivePFC,activeswitchesareusedinconjunctionwithreactiveelementsinordertoincreasetheeffectivenessofthelinecurrentshapingandtoobtaincontrollableoutputvoltage.TheswitchingfrequencyfurtherdifferentiatestheactivePFCsolutionsintotwoclasses:Inlow-frequencyactivePFC,switchingtakesplaceatlow-orderharmonicsoftheline-frequencyanditissynchronizedwiththelinevoltage.Inhigh-frequencyactivePFC,theswitchingfrequencyismuchhigherthanthelinefrequency.AnactivePFCisusingactiveswitchesinconjunctionwithreactiveelementsinordertoincreasetheeffectivenessofthelinecurrentshapingandtoobtaincontrollableoutputvoltage.BecauseactivePFCusesacircuittocorrectpowerfactor,activePFCisabletogenerateatheoreticalpowerfactorofover95%,upto99%,buttheyareexpensive[5].TheboostPFCtopologyisanactivePFCconvertertopology,suitableforalowtomediumpowerrangeuptoapproximately1kWduetothediodebridgelosseswhichsignificantlydegradetheefficiencybydissipatingheatinalimitedarea.Theboostinterleavedconverterhastheadvantageofparalleledsemiconductors.Italsoreducesoutputcapacitorhighfrequencyripple,butitstillhastheproblemofheatmanagementfortheinputdiodebridgerectifiers[3].Theinductorripplecurrentcancellationallowstheareductioninboostinductormagneticvolume.Thisisduetotheenergystoragerequirementofthetwointerleavedinductorsbeinghalfthatofsinglestagedesignedforthesamepowerlevel,switchingfrequencyandinductance.But,thereductioninenergystoragedoesnotdirectlytranslateintomagneticvolumereduction[4].Thefamilyofbridgelessboostconvertershasbeenwidelyusedsinceitallowsconsiderablereductioninconductionlossesprovidingincreasedglobalefficiencyoftheconverterstructure[5].ComparedtotheboostinterleavedPFCconverter,thebridgelessboostinterleavedPFCconverterintroducestwomoreFETsandtwomorefastdiodesinplaceoffourslowdiodesusedininputbridgefortheformerconverter.Inthis978-1-4799-4161-2/14/$31.00©2014IEEEcasetheapplicationoftheinterleavingofmultipleconverterscellstechniqueisinterestingbecauseallowsthedivisionofthecurrentstressesinthesemiconductors[6].Basedonliteraturestudies,efficiencyimprovementisexpectedforthebridgelessinterleavedPFCtopologycomparedwiththeinterleavedboostPFCtopology.Thegeneralaimofthispaperistoinvestigatetheperformances/efficiencyofthetwoPFCtopologies:theboostinterleavedPFCconverterandthebridgelessboostinterleavedPFCconverter.Lossesanalysisandefficiencyevaluationofthetwoabovementionedconvertersisalsoprovided.II.BOOSTINTERLEAVEDPFCCONVERTERTOPOLOGYTheboostinterleavedPFCconvertertopologyispresentedinFig.1.ItusesadedicateddiodebridgetorectifytheACinputvoltagetoDC,whichisthenfollowedbytwoboostPFCconvertersinparallel,operating180ooutofphase.TheboostinterleavedPFCconverterhastheadvantageofparalleledsemiconductors.Theinputcurrentisthesumoftwoinductorcurrents,thereforeitreducesoutputcapacitorhighfrequencyripple,butitstillhastheproblemofheatmanagementfortheinputdiodebridgerectifiers.ThehardwareimplementationfortheboostinterleavedPFCconve