Boost Interleaved PFC

BoostInterleavedPFCversusBridgelessBoostInterleavedPFCConverterPerformance/EfficiencyAnalysisMihaela-CodrutaANCUTI*,MarcusSVOBODA*,SorinMUSUROI*,AlexandruHEDES*,DepartmentofElectricalEngineering,UniversityPolitehnicaofTimisoara,Timisoara,[e-mail],[e-mail],[e-mail],[e-mail]-ValeriuOLARESCU**,MartinWienmann**AKO-DIEHLControls,Munchen,Germany,[e-mail],[e-mail]—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