开关电源发展与压电材料应用展望

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1、TRANSONEROverview.PiezoelectrictransformersforCCFLbacklightingFaceElectronics,LC.,Virginia,USADecember5,2001Dr.AlfredoVázquezCarazo427W.35thSt.Norfolk,VAUSAPhone:757.624.2121Fax:757.624.2128www.faceco.comalfredo@faceco.comCharlieElliott,PulseEngineeringPiezoelectricTransformersMagn

2、eticTransformerRosen-typePiezo-TransformerTransonerPiezo-TransformerUnitsincmTransformersforCCFLbacklightingPiezoelectricity:BasicconceptsPiezoelectricTransformersINVERSEPIEZOELECTRICEFFECTElectricaltoMechanicalenergyconversionDIRECTPIEZOELECTRICEFFECTMechanicaltoElectricalenergycon

3、versionPZT:DiscoveredinJapanearlyinthe1950s.Thesematerialsareusableatleastto250o.Rosen-typePiezoelectricTransformersTechnicalliteraturerefersthenameofPIEZOTRANSFORMERtothedevicewhichwasinitiallydevelopedforCharlesA.RosenandKeithFish(1954).Source:ThesisAlfredoVazquezBackgroundonPiezo

4、electricTransformersPiezoelectricTransformersBackgroundonPiezoelectricTransformersPiezoelectricTransformersTypesof‘Rosen’-piezoelectrictransformersPiezoelectricTransformersFamilyPhotosBackgroundonPiezoelectricTransformers(PTs)Rosen:FirstPatentonPTsBerlincourt:Ballastforgaseousdischa

5、rgelamp(VermitronCorp.)PTsforTVreceivers–HVforcathoderay.(DenjiOnkyoLimited,Matsushita,Motorola,RCACorp.)PTsfortriggeringpowerswitchesgateswithgalvanicdecoupling(Triacs,Tiristors,Mosfets,etc.):Siemens,GeneralElectric.PTsforbacklightCCFLinlap-topcomputers.(NEC,Murata,Matsushita,Taihe

6、iyo,Tamura,Motorola,Tokin,etc.)195870’s70s80s85stopresentIncreasePowerDensity:SmallersizesCurrenttargetBackgroundonPiezoelectricTransformersPiezoelectricTransformersWhatwaswrongwith“those”Piezo-trafosSUCCESFULLYIMPROVEDSINCE1985’sMaterialDrivingCircuitryManufacturingProcessMountingP

7、ZT-Materialunderdevelopment–(1954)(lowQ,highdielectriclosses,lowcouplingcoef.).HighSinteringMaterialsExpensiveNotape-castingtechniquesLimitonsizesDoublePolarizationProcessnooptimizedReliablehousingtechniquesunderdevelopmentElectroniccircuitbasedondiscretecomponentsLimitedPOWERCAPA

8、BILITIES(5W/cm3)Po