A model to analyze and improve dynamic response of high light load efficiency multi-mode converters

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1、AModeltoAnalyzeandImproveDynamicResponseofHighLightLoadEfficiencyMulti-ModeConvertersYuRuiyang,M.H.Pong,SeniorMemberIEEETheUniversityofHongKongDepartmentofElectricalandElectronicEngineeringyry721@eee.hku.hk;mhp@eee.hku.hkAbstract-Reducedswitchingfreq

2、uencypeakcurrentmodeisaSmallsignalanalysisisimportantinthedesignstage.popularmethodtoboostuplightloadefficiencyofisolatedpowerConventionalconstantfrequencyDCM/CCMpeakcurrentconverters.However,transientresponsedecreasesdramaticallymode(PCM)controliswe

3、llanalyzedby[10-13].Theconstantwhenlowswitchingfrequencyisadopted.ThispapercoverssmallontimeorconstantpeakcurrentvariablefrequencyDCMmodesignalanalysisofcontrolschemethatpeakcurrentandswitchingisalsoanalyzedbyotherresearchers[2][3][13].However,thefre

4、quencybothmodulatedbythecontrolsignal.Aninterestingvariablepeakcurrentvariablefrequencyapproachwherepeakresultisfoundthatthecontrolschemecanbedecomposedintotwocurrentandswitchingfrequencybothchangeasfeedbacksignalparts:peakcurrentmodepartandfrequency

5、modulationmodevarieshasnotbeenfullyanalyzed.Hereinthispaper,anovelpart.Atlowswitchingfrequencylightloadconditionsthemethodtodecomposevariablepeakcurrentvariablefrequencybandwidthfromcontroltooutputislow.Accordingtotheintotwopartsviapartialdifferentia

6、tionisproposed.Anproposedmodel,specialdesignonvoltagecontroloscillatorisinterestingresultisfoundthatthenewtransferfunctionofdesirabletoboostupthebandwidthatlightloadconditions.Bythevariablepeakcurrentvariablefrequency(ViVf)modeistimedomainconceptthes

7、witchingfrequencyshouldbedesignedactuallyjustthesumofconstantfrequencypeakcurrentmodetorisequicklyduringstepuptransientinordertoovercomethe(PCM)andconstantpeakcurrentvariablefrequency(CIpk)drawbackscausedbylowswitchingfrequencyandpreventmode.Adesignm

8、ethodbasedontheproposedmodelistransformersaturation.ExperimentalprototypeimplementedonaTwo-FET-ForwardconverterandTwo-FET-Forwardconverterisbuildtoverifytheproposedidea.experimentalresultsarepresentedI.INTRODUCTIONLightloadefficiencyisamajorconcernin