开关电源发展与压电材料应用展望.ppt

TRANSONEROverview.PiezoelectrictransformersforCCFLbacklighting,FaceElectronics,LC.,Virginia,USA,December5,2001,Dr.AlfredoVzquezCarazo,427W.35thSt.Norfolk,VAUSAPhone:757.624.2121Fax:alfredo,CharlieElliott,PulseEngineering,PiezoelectricTransformers,TransformersforCCFLbacklighting,Piezoelectricity:Basicconcepts,PiezoelectricTransformers,Rosen-typePiezoelectricTransformers,TechnicalliteraturerefersthenameofPIEZOTRANSFORMERtothedevicewhichwasinitiallydevelopedforCharlesA.RosenandKeithFish(1954).,Source:ThesisAlfredoVazquez,BackgroundonPiezoelectricTransformers,PiezoelectricTransformers,BackgroundonPiezoelectricTransformers,PiezoelectricTransformers,TypesofRosen-piezoelectrictransformers,PiezoelectricTransformers,FamilyPhotos,BackgroundonPiezoelectricTransformers(PTs),BackgroundonPiezoelectricTransformers,PiezoelectricTransformers,Whatwaswrongwith“those”Piezo-trafos,Material,DrivingCircuitry,ManufacturingProcess,Mounting,PZT-Materialunderdevelopment(1954)(lowQ,highdielectriclosses,lowcouplingcoef.).,HighSinteringMaterialsExpensiveNotape-castingtechniquesLimitonsizesDoublePolarizationProcessnooptimized,Reliablehousingtechniquesunderdevelopment,Electroniccircuitbasedondiscretecomponents,LimitedPOWERCAPABILITIES(5W/cm3),Power,HighimmunitytoexternalEMI,lowprofile,compact,BackgroundonPiezoelectricTransformers,PiezoelectricTransformers,Howdotheyoperate?.Resonance,fR,fA,BackgroundonPiezoelectricTransformers,PiezoelectricTransformers,/2mode,3/2mode,PiezoelectricTransformers,Features:SimpleconstructionwithoutwindingsNowindingshortsduringoperationNomagneticfieldinvolveintheoperation(reducedRFandEMI)LowprofileHighefficiencyNon-flammable98%TypicalEfficiencyNoHighVoltage“CoronaEffect”PureSineWaveOutput(MinorDistortion)SurfaceTemperatureraisingT35Kduetotheirexcellentthermaldissipationbehavior.,Piezoelectricvs.Magnetic,5W,50W,100W,220W,1kV,10V,5kV,10,kV,PowerDeliveryW,Output,VoltageVp,T6,T1,T3,USA1998,TRANSONER,TECHNOLOGY,(FaceInter.Corp),NewPiezo-Trafotechnologies,PiezoelectricTransformers,T3-HVTransoner,CONSTRUCTION,COUPLINGAREA,POLINGDIRECTION,STRESSDIRECTION(LONGITUDINALvs.RADIAL+SHEAR),PiezoelectricTransformers,Rosenvs.Transoner,InputPart,OutputPart,k33+k31,k33+k31+k15,K153.k31,PiezoelectricTransformers,Rosenvs.Transoner,TRANSONERADVANTAGESSimpleachievementofISOLATIONcapabilities35kVbyaddingaisolationlayerThestackconceptallowsaLARGERMECHANICALCOUPLINGAREAandthusahigherpowerdensityINPUTANDINPUTCAPACITANCEScanbeindependentlydesignedwithouthavingthesamethickness.Largerstep-upratiosAsaresultSMALLERSIZESandmorecompactandefficientinvertercanbedeveloped,Rosen-type,Transoner-type,ELECTRICALENERGY,Voltage,current,ELECTRICALENERGY,Voltage,current,Transoner:Typesandspecifications,PiezoelectricTransformers,PatentNotice:TechnologydisclosedonthispagecoveredbyoneormoreissuedorpendingU.S.andInternationalpatentsownedbyfaceInternationalCorporation,Norfolk,Virginia,USA.,T1-TypeTransonerLargePowerStep-upandStep-downMedium,lowimpedanceloads200-1k(Linearfluorescent),T3-TypeTransonerMedium-lowPower(5-8W)VeryhighStep-up(200)Largeimpedanceloads50k-300k(CCFL),MiniT1TransonerMini-size(5mm2x1mm)Step-upMediumimpedanceloads200-1k(PDA,CellPhones),Transoner:Typesandspecifications,PiezoelectricTransformers,TypicalHighVoltageTransonerType-3Devices,Specifications,TypeT3:HighVoltageTransoner,Transoner:Typesandspecifications,PiezoelectricTransformers,OperationPoint:MaximumEfficiency,ApproachtotheOperationPrinciple,PiezoelectricTransformers,GeneralBehavior,ApproachtotheOperationPrinciple,PiezoelectricTransformers,LoadDependence:CCFLstartingupandContinuousoperation,ApproachtotheOperationPrinciple,PiezoelectricTransformers,Generalprinciplefordrivingapiezoelectricresonanttransformer,GeneralBlockDiagram,PiezoelectricTransformers,DrivingCircuitryforPiezoelectricTransformers,Piezo-TrafoEquivalentCircuit,C=EquivalentStiffnessR=EquivalentMechanicalResistanceL=Equivalentmass,PiezoelectricTransformers,DrivingCircuitryforPiezoelectricTransformers,Piezoelectrictransformerinputsectionsarecharacterizedbyashuntinputcapacitancewhichmayexceedtensofnano-farads.,TwowaystodriveaPiezoelectricTransformer,Square-wavesignal:PWMconverters,Sine-wavesignal:Resonantconverters,Largeharmoniccontents(Inputdriveharmonicsmayberejectedbythehigh-Qtransformertherebyreducingdriveefficiency.DriveharmonicscanexcitespuriousmodesinthePTwhichwillbedifficulttosuppress.ThecirculatingenergythroughtheshuntinputcapacitanceCd1characteristicoftheinputsectionofPTgeneratedielectriclosses(turn-onlosses).,ZeroVoltageSwitchingTechnique:useasquareswitchingsignalwithZVStechniquetominimizeswitchinglosses.,DC-ACDrivingCircuitTechniques,PiezoelectricTransformers,DrivingCircuitryforPiezoelectricTransformers,Class-EDC/ACconverter,Half-bridgeDC/ACconverter,Full-bridgeDC/ACconverter,PiezoelectricTransformers,DrivingCircuitryforPiezoelectricTransformers,Push-pullDC/ACconverter,ZVStechnique,DrivingCircuitryforPiezoelectricTransformers,PiezoelectricTransformers,Wherewouldoneuseit?,HighVoltageLowPowerapplications:CCFLLampforLCDinLaptopcomputersHighVoltageignition+Step-downsteadystateMediumPowerapplications:FluorescentlampsPowersupply