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一种基于仿电流模式控制的开关电源
Title:AStudyonCurrent-modeControlBasedSwitchingPowerSupply
Abstract:
Switchingpowersupplieshavegainedsignificantpopularityduetotheirhighefficiencyandcompactsize.Inthispaper,weproposeacurrent-modecontroltechniqueforswitchingpowersupplies.Theproposedtechniqueutilizesacurrentfeedbacklooptoregulatetheoutputvoltageandimprovethedynamicresponse.Theoreticalanalysisandsimulationresultsarepresentedtodemonstratetheeffectivenessandadvantagesofthecurrent-modecontroltechnique.
1.Introduction
Switchingpowersupplieshavebecomeessentialcomponentsinvariouselectronicsystemsduetotheirhighconversionefficiency.Traditionalvoltage-modecontroltechniqueshavebeenwidelyusedinswitchingpowersuppliesformanyyears.However,thesetechniquessufferfromseverallimitations,suchaspoortransientresponse,limitedbandwidth,andlownoiseimmunity.Toovercometheselimitations,current-modecontroltechniqueshavebeendeveloped.
2.Current-ModeControlTechnique
Thecurrent-modecontroltechniqueoperatesontheprincipleofregulatingtheinductorcurrentinsteadoftheoutputvoltage.Itutilizesacurrentfeedbacklooptomeasuretheinductorcurrentandadjustthedutycycleofthepowerswitchaccordingly.Thisfeedbackloopimprovesthetransientresponseandstabilityoftheswitchingpowersupply.Themainadvantagesofcurrent-modecontrolincludebetternoiseimmunity,fasterresponsetime,andhigherbandwidthcomparedtovoltage-modecontrol.
3.ControllerDesign
Thedesignofthecurrent-modecontrollerinvolvesselectingsuitablecompensationcomponents,suchasthecurrent-modeerroramplifierandtheslopecompensationcircuit.Thecurrent-modeerroramplifieramplifiesthedifferencebetweentheoutputandreferencecurrent,providingcontrolsignalstothepowerswitch.Theslopecompensationcircuitcompensatesforthesubharmonicoscillationthatcanoccurincurrent-modecontrol.Thedesignprocessisdiscussedindetail,consideringfactorssuchasloopstability,systembandwidth,andphasemargin.
4.SimulationandAnalysis
Simulationmodelsaredevelopedtoevaluatetheperformanceoftheproposedcurrent-modecontroltechnique.Thesimulationresults