压电变压器(英文)综述-原理-以及相关压电材料课件.ppt

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1、ZhuXiaoxingPiezoelectricTransformersContentsBackgroundPrincipleofPiezoelectricTransformersExamplesandanalysisConclusionPiezoelectricTransformersPiezoelectricity:AbriefofhistoryPiezoelectricityderivesfromtheGreekword“piezein”=topress.188019391917Firsthumanconta

2、ct:“StoneAge”:useof‘flint”,avarietyofquartz,toproducefirebycreatingamechanicalimpactorfriction.Beforetheinventionofmatchesthismaterialcontinuedbeingusedasalighterknockingitagainstiron.PierreandJacquesCuriediscoveredthedirect(1880)andtheinverseeffects(1881)inqu

3、artzcrystals.duringWWI,PaulLangevindevelopedaquartz-basedtransducertogenerateanddetectacousticwavesinwater.SONARandULTRASONICSTheUSArmedServicesmadethedecisiontomakelargescaleuseof“crystalcontrol”inmilitarycommunicationsystems.DuringtheWWIItheUSaloneusedabout

4、50millionquartzcrystalelements.PiezoelectricTransformersPiezoelectricity:Abriefhistory194619651985PiezoelectriceffectisfoundinBariumTitanate.Japanesecommercialenterprisesbegantoreapthebenefitsofsteadyapplicationandmaterialsdevelopmentwork.Thecommercialsuccesso

5、ftheJapaneseeffortshasattractedtheworld-wideinterestforthistechnologyandspurredanewefforttodevelopsuccessfulpiezoceramicproducts.CeramicsPiezoelectricTransformersPiezoelectricTransformersAdvantagesofpiezoelectrictransformersHighconversionefficiencySimplestruct

6、ureHighstep-upratioStableandlongservicelifeCompactSizeandLightweightPiezoelectricTransformersDrivepartPowerpartVinVoutPTPPiezoelectricTransformersPiezoelectricTransformersPropertiesofPiezoelectricMaterialD.C=>dielectricconstantKp=>electromechanicalcouplingfact

7、orQm=>mechanicalqualityfactorTc=>curietemperaturePiezoelectricTransformersPropertiesofPiezoelectricMaterialPNW-PMN-PZTPb(Ni1/2W1/2)O3Pb(Mn1/3Nb2/3)O3Pb(ZrxTiy)O3Pb1-aSra(Ni1/2W1/2)0.02(Mn1/3Nb2/3)b(ZrxTiy)1-0.02-bO3PiezoelectricTransformersPreparation+0.5wt%Pb

8、O+0.3wt%Fe2O3+0.25wt%CeO2Pb1-aSra(Ni1/2W1/2)0.02(Mn1/3Nb2/3)b(ZrxTiy)1-0.02-bO3RawmaterialsAcetone-milledCalcinationCIPSinterproductsPiezoelectricTransformersSystemSampleNO.composi