Active-Clamp Dual-Interleaved Flyback反激.ppt

《Active-Clamp Dual-Interleaved Flyback反激.ppt》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、1XingshuoLiDepartmentofElectricalandElectronicEngineeringActive-clampedDual-interleavedFlybackInverter12ThePresentationOutlineReviewoftheTechnologyusedinActive-ClampDual-InterleavedFlybackMicro-InverterActiveClampCircuitFlybackCircuitSPWMExperimentSimulationDSPCodeResult3Active-

2、ClampDual-InterleavedFlybackMicro-Inverter4Active-ClampDual-InterleavedFlybackMicro-Inverter5Active-ClampDual-InterleavedFlybackMicro-InverterActive-clampedDual-Interleaved6Active-ClampCircuitTherearemanyadvantagesforactive-clamp:Theleakageinductanceenergycanbefeedbacktotheoutpu

3、t,Lowvoltagestress,Bigdutycycle(morethan50%),ReduceEMI(electro-magneticInterference),Improvetheefficiencyofthecircuit,ImplementZVSofthemainandauxiliaryswitch,reducingthelossofcircuitswitch.7Active-ClampCircuitLow-SideActiveClampHigh-SideActiveClamp8Active-ClampCircuit9Active-Cla

4、mpCircuit10FlybackTheflybacktopologyhaslongbeenattractivebecauseofitsrelativesimplicitywhencomparedwithothertopologiesusedinlowpower(uptoseveralhundredwatts)applications.Theflyback‘‘transformer”servesthedualpurposeofprovidingenergystorageaswellasconverterisolation,theoreticallym

5、inimizingthemagneticcomponentcountwhencomparedwith,forexample,theforwardconverter.Adrawbacktotheuseoftheflybackistherelativelyhighvoltageandcurrentstresssufferedbyitsswitchingcomponents.11Flyback——StructureandprincipleWhentheswitchisclosed,theprimaryofthetransformerisdirectlycon

6、nectedtotheinputvoltagesource.Theprimarycurrentandmagneticfluxinthetransformerincreases,storingenergyinthetransformer.Thevoltageinducedinthesecondarywindingisnegative,sothediodeisreverse-biased.Theoutputcapacitorsuppliesenergytotheoutputload.Whentheswitchisopened,theprimarycurre

7、ntandmagneticfluxdrops.Thesecondaryvoltageispositive,forward-biasingthediode,allowingcurrenttoflowfromthetransformer.Theenergyfromthetransformercorerechargesthecapacitorandsuppliestheload.12Flyback——TwoModes13FlybackSimulation14SPWMSinusoidalPWMreferstothegenerationofPWMoutputsw

8、ithsinewaveasthemodulatingsignal.Theonandoffins