PFC control loop design base on Mulitplier

AverageControlMethodsforCCMPFCOctober’2007ContentsBackgroundKnowledgeReviewControlMethodofMultiplierControlmethodofICEXPCSXXFutureDirectionSummaryCCMBOOSTWaveformsBOOSTConverter:IfLFishighenoughVoltage-secondbalanceonLF:DVVMTDVVDTVinosinosin11)1)((Features:a.VogreaterthanVinb.Noisolationbetweeninandoutc.Lowinputripplecurrentd.Highoutcapacitorripplecurrente.EasygatedrivingCriticalInductancescritcritscritcritsTRLDWhenDDTRLRTLDMDCMForDMCCMFor27231)1(2122411:11:max_22CCMBoostforPFCToooooooooooininoininoiiooininiiniIVdttpTPtIVtiVtptItVIVtVIVVtitutitVVDtItitVtu02)(1)2cos1()()()2cos1()2cos1(sin2)()()(sin21sin2)(sin2)(ContentsBackgroundKnowledgeReviewControlMethodofMultiplierControlmethodofICEXPCSXXFutureDirectionSummaryPFCControlPurpose&Notion•Keepconstantoutputvoltageforwideinputneedavoltageerroramplifier(DetectDCout)•Keepconstantpoweroutput:negativeresistorcharacterneedafeedforwardvoltagesignal•Keepinputcurrenttofollowinputvoltageneedacurrenterroramplifier(detectACin)MultiplierlinkthesecontrolnotionsMultiplierFunction2281.0sin)1(24129.0sin2)()1(FFinVAOUTIACMOUTFFIACinFFIACinIACFFVAOUTIACMOUTRVtVRiKRRVVRtVtiKVVIIMultiplieroutputisacurrentsignalwhichisreferenceforcurrenterroramplifier.Average-currentcontrolloopTv:voltageloop;BW100Hz;Ti:currentloop;100HZBWFs/2He(s)≒1CurrentLoopGain)()(sGsGFRTidCAmSiModulatorGainSseseNCAmVTSTSSvdF11)(1TransferFunctionGidBoiiBoLidLVfjffsLVdifjsG2)2(CurrentLoopGainCABossCAidmsiSPICIPIZIicaPIZIZIZIZIPIZIIICAGsLVVRGGFRTfffffjffjjffCCsRCsRCCsRfjsG11)||(11)(1)2(VoltageLoopBciiBcEAovcLoLooooFFinMSEAocooEAinFFininMSininEAinFFininMSrefSinEAVCVCgfjffsCgvvfjsGRRpowerCosTantForRIVRVKKKKvIgVIvVKKVKKIVvVKKVKKIKIsGsGsT2ˆˆ)2(:1)()()(222222GetKsVoltageLoopCompensationContentsBackgroundKnowledgeReviewControlMethodofMultiplierControlmethodofICEXPCSXXFutureDirectionSummaryICEXPCS01CircuitsPFCCurrentLoopSteadyStateSolutionofiLPFCControlPurpose&Notion•Keepconstantoutputvoltageforwideinputneedavoltageerroramplifier(DetectDCout)•Keepconstantpoweroutput:negativeresistorcharacterneedafeedforwardvoltagesignal(nonlineargain,M1*M2)•Keepinputcurrenttofollowinputvoltageneedacurrenterroramplifier(nodetectACin)ContentsBackgroundKnowledgeReviewControlMethodofMultiplierControlmethodofICEXPCSXXFutureDirectionSummaryFutureDirection•BoundarymodeorDCMforlowerpower•Nonlinearandone-cyclecontrolPFCICapplication•Softswitchingtopologyforgreaterthan500Wpower•InterleavePFCforhigherpower•DSPcontrolapplicationSummary•PFCbasicknowledgereview•Loopanalyzeforconventionalcontrolmethod•Non-linearcontrolICintroduction•Futureprediction