开关电源发展与压电材料应用展望课件.ppt

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PiezoelectrictransformersforCCFLbacklighting
FaceElectronics,LC.,Virginia,USA
December5,2001
ázquezCarazo
,VAUSA
Phone:
Fax:

******@
CharlieElliott,PulseEngineering
PiezoelectricTransformers
MagneticTransformer
Rosen-typePiezo-Transformer
TransonerPiezo-Transformer
Unitsincm
TransformersforCCFLbacklighting
Piezoelectricity:Basicconcepts
PiezoelectricTransformers
INVERSEPIEZOELECTRICEFFECT
ElectricaltoMechanicalenergyconversion
DIRECTPIEZOELECTRICEFFECT
MechanicaltoElectricalenergyconversion
PZT:.
BackgroundonPiezoelectricTransformers
PiezoelectricTransformers
Typesof‘Rosen’-piezoelectrictransformers
PiezoelectricTransformers
FamilyPhotos
BackgroundonPiezoelectricTransformers(PTs)
Rosen:FirstPatentonPTs
Berlincourt:Ballastforgaseousdischargelamp(VermitronCorp.)
PTsforTVreceivers–HVforcathoderay.
(DenjiOnkyoLimited,Matsushita,Motorola,RCACorp.)
PTsfortriggeringpowerswitchesgateswithgalvanicdecoupling
(Triacs,Tiristors,Mosfets,etc.):Siemens,GeneralElectric.
PTsforbacklightCCFLinlap-topcomputers.
(NEC,Murata,Matsushita,Taiheiyo,Tamura,Motorola,Tokin,etc.)
1958
70’s
70s
80s
85stopresent
IncreasePowerDensity:Smallersizes
Currenttarget
BackgroundonPiezoelectricTransformers
PiezoelectricTransformers
Whatwaswrongwith“those”Piezo-trafos
SUCCESFULLYIMPROVEDSINCE1985’s
Material
DrivingCircuitry
ManufacturingProcess
Mounting
PZT-Materialunderdevelopment–(1954)
(lowQ,highdielectriclosses,lowcouplingcoef.).
HighSinteringMaterialsExpensive
Notape-castingtechniquesLimitonsizes
DoublePolarizationProcessnooptimized
Reliablehousingtechniquesunderdevelopment
Electroniccircuitbasedondiscretecomponents
LimitedPOWERCAPABILITIES(5W/cm3)
Power
Howdotheyoperate?.Resonance
0
10
20
30
40
50
60
70
InputImpedanceopencircuitconditions
Impedance[Ohms]
1stlongitudinalmode
(fundamental)
3rdlongitudinalmode
100
200
300
400
500
600
Frequency[kHz]
-100
-80
-60
-40
-20
0
20
40
60
Phase[Degrees]
fR
fA
BackgroundonPiezoelectricTransformers
PiezoelectricTransformers
/2mode
3/2mode
PiezoelectricTransformers
Features:
Simpleconstructionwithoutwindings
Nowindingshortsduringoperation
Nomagneticfieldinvolveintheoperation(reducedRFandEMI)
Lowprofile
Highefficiency
Non-flammable
98%TypicalEfficiency
NoHighVoltage“CoronaEffect”
PureSineWaveOutput(MinorDistortion)
SurfaceTemperatureraisingT35Kduetotheirexcellentthermaldissipationbehavior.

5W
50W
100W
220W
1kV
10V
5kV
10
kV
Material
Improvements
DimensionalRedesign
Modular
Design
PowerDelivery[W]
Output
Voltage[Vp]
Step
-
upratio
»
50
-
100
InputVoltagein
CCFLapplicat.
(NEC,Tokin,Murata,etc)
JAPAN(1985
-
2000)
Improvements
USA1958
Rosen
-
type
T6
T1
T3
USA1998
TRANSONER
TECHNOLOGY
()
NewPiezo-Trafotechnologies
PiezoelectricTransformers
T3-HVTransoner
PiezoelectricTransformers

TRANSONERADVANTAGES
SimpleachievementofISOLATIONcapabilities>35kVbyaddingaisolationlayer
ThestackconceptallowsaLARGERMECHANICALCOUPLINGAREAandthusahigherpowerdensity
-upratios
AsaresultSMALLERSIZESandmorecompactandefficientinvertercanbedeveloped
Rosen-type
Transoner-type