欢迎来到天天文库
浏览记录
ID:48128860
大小:673.93 KB
页数:55页
时间:2019-11-28
《LLC电路基本原理分析及公式推导.pdf》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、SimplifiedAnalysisandDesignofSeries-resonantLLCHalf-bridgeConvertersMLDGROUPINDUSTRIAL&POWERCONVERSIONDIVISIONOff-lineSMPSBUApplicationLabI&PCDiv.-Off-lineSMPSAppl.LabPresentationOutline•LLCseries-resonantHalf-bridge:operationandsignificantwaveforms•Simplifiedmodel(FHAa
2、pproach)•300WdesignexampleI&PCDiv.-Off-lineSMPSAppl.LabSeries-resonantLLCHalf-BridgeTopologyandfeaturesQ1Center-tappedoutputwithfull-CrLswaverectificationMulti-resonantLLCtankcircuit(lowvoltageandhighcurrent)VinVariablefrequencycontrolDriverFixed50%dutycycleforQ1&Q2H
3、alf-bridgeQ2LpVoutDead-timebetweenLGandHGtoallowMOSFET’sZVS@turn-onLLCtankcircuitfsw»fr,sinusoidalwaveforms:lowturn-offlosses,lowEMIEqualvoltage¤tstressforPreferablyintegratedintoasingleVoutsecondaryrectifiers;ZCS,thennomagneticstructurerecoverylossesNooutputc
4、hoke;costsaving3reactiveelements,2resonantfrequenciesSingle-endedoutputwithIntegratedmagnetics:bothL’scan1bridgerectifiicationfr1(highvoltageandlowcurrent)berealizedwiththetransformer.2p××LsCr×f>fHighefficiency:>96%achievabler1r21fr22p××(Ls+Lp)Cr×I&PCDiv.-Off-lineSMPS
5、Appl.LabLLCResonantHalf-bridgeWaveformsatresonance(f=f)swr1Dead-timeGate-drivesignalsHBmid-pointVoltageResonantcapvoltageTankcircuitcurrentissinusoidalMagnetizingcurrentistriangularTransformercurrentsDiodevoltagesOutputcurrentCCMoperationDiodecurrentsI&PCDiv.-Off-lineSM
6、PSAppl.LabLLCResonantHalf-bridgeSwitchingdetailsatresonance(f=f)swr1Dead-timeGate-drivesignalsZVS!HBmid-pointVoltageResonantcapvoltageTankcircuitcurrent>0TransformercurrentsMagnetizingcurrentV(D1)<0DiodevoltagesI(D1)=0ZCS!DiodecurrentsI&PCDiv.-Off-lineSMPSAppl.LabLLCRes
7、onantHalf-bridgeOperatingSequenceatresonance(Phase1/6)1/6Q1OFFQ1ONQ1OFFQ1Q2ONQ2OFFQ2ONCoss1LsCrVinn:1:1D1CoutCoss2VoutLpQ2D2Q1isOFF,Q2isOND1isOFF,D2isON;V(D1)=-2·VoutLpisdynamicallyshorted:V(Lp)=-n·Vout.CrresonateswithLs,fr1appearsOutputenergycomesfromCrandLsPhase
8、endswhenQ2isswitchedoffI&PCDiv.-Off-lineSMPSAppl.LabLLCResonantHalf-bridgeOperatingSequenceatresonance(Phase2/
此文档下载收益归作者所有