LLC resonant converter for 48V to 0.9V VRM 英文文献资料

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1、200435thAnnualIEEEPowerEiectroitirsSpecialistsConferenceAachen,Germany,2004LLCResonantConverterfor48Vto0.9V‘VRMYanjunZhang,DehongXu,MinChenYuHailZhongDuInstituteofPowerElectronics,ZhejiangUniversityEmersonNetworkPowerCo.,Ltd.Hangzhou310027,ChinaShenzhen518129,ChinaEmail:

2、yjzhang@zju,edu.cnEmail:hanyua@avansys.comAbstrarf48Vto0.9VVRMusingLLCresonantconverterispresented.ZVSisrealizedforswitchesandtheconvertercanoperateathigherfrequency.Howtoreduceprimarycurrentamplitudebyreducingpowerfactorangleisexplored.Theeffectofsecondaryleakageinducta

3、nceisstudiedandFEAmethodisusedtofindtheoptimaltransformerwindingconfiguration.Theresonantinductorcanheintegratedwithtransformerprimaryleakageinductance,whichreducesthetotalmagneticUcomponentcounts.Aprototype0148Vto0.9V/50AVRMisbuiltFig.1.LLCResonantConverterfor48Vto0.9VV

4、RMtoverifytheresult.inalargerloadrange.Neverthelessresonantconvertersneedsvariable-frequencycontrol,whichcausedifficultytothe1.INTRODUCTIONconverterdesignsuchasgatingofsynchronousrectifierandThecomputerindustryhasbeenquicklyexpandingforthepowerfactorfortberesonantloop,an

5、dtheswitchinglastdecade.Thespeedandintegrationdensityoffrequencyrangeoftb:convener.microprocessorshaveincreasedrapidly.NowtheprocessorInthispaper,DCcharacteristicsoftheconverterisworkswithclockfrequenciesinthe2-3GHzrange.ThenextanalyzedandtheoperationstagesarepresentedMe

6、thodtogenerationofprocessorswillworkwithevenhigherclockreducethepowerfactorangleisexploredduetoitsimportantfrequencies.Asaresult,modemmicroprocessorsarebeinginfluenceontheconverterperformance.Secondarysidedesignedtoworkwithlowerlevelsofvoltageinordertomeetleakageinductan

7、ceimpairstheconverterefficiencyandFEAmethodisusedtoendtheoptimaltransformerwindingtheincreasinglyhighdemandsforspeedandintegrationconfigurationwithleastsecondarysideleakageinductance.density.NowtheIntelPentium*microprocessorsrunatthevoltageof1.3V-1.7V,inthefuturethevolta

8、gewillbebelow11.LLCR.ESONANTCONVERTERANALYSISIV.Therequirementsforthemicroprocessors’powersuppliessucha