台达_培训Principles of Converter Control

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1、PRINCIPLESOFCONVERTERCONTROLPresentedbyMilanM.JovanovićJune2003PRINCIPLESOFCONVERTERCONTROL•ThistrainingmaterialwaspreparedbyDPELStaffanditisconsideredproprietary•DistributionofthismaterialoritspartsisnotpermittedwithoutwrittenconsentofDPELOUTLINEI.VoltageModeControl•ContinuousConductionMode•Dis

2、continuousConductionMode•StabilityIssuesinDCM/CCMII.VoltageModeControl•DesignExamplesIII.CurrentModeControl•Principles•Multiple-OutputConverters•DesignExampleIV.MagampControl•Principles•DesignExampleV.Single-PhasePFCControl•Principles•DesignExampleVI.AppendicesPRINCIPLESOFCONVERTERCONTROLVOLTAGE

3、MODECONTROLPRINCIPLESOFCONVERTERCONTROLVOLTAGEMODECONTROLINCONTINUOUSCONDUCTIONMODE1VOLTAGE-MODECONTROL•Constant-frequencyPWMcontrolvRAMPvvEA2>EA1divEA1VRAMPLVinVoCLKdvEAEAD1TsPWMVREFD2TsvRAMPTVO=D⋅Vins•Voltageregulationisachievedbyduty-cyclevariation,i.e.,byPulse-Width-Modulation(PWM)control∆d1

4、•PWMcomparator(modulator)gainisFm==∆vEAVRAMPPWMCONTROLOBJECTIVESPOWERSTAGE•Control-loopstabilityVof(d)=VinVinVo•RegulationaccuracyGPS(s)•TransientresponsespeeddRZFD1•Desiredregulationaccuracy,speed,andZIstabilitycanbeachievedbytailoringEAloopgainPWMVREFRD2T(s)=GPS(s)KDGEA(s)FmFmGEA(s)KDModulator

5、VErrorAmplifierwitherror-amplifiercompensationRAMPVoltageDivider®DCloopgaindeterminesregulationaccuracy®Loopcrossoverfrequencydeterminesresponsespeed•Controldesignrequiresknowledgeofpowerstagedynamics,i.e.,power-stagesmall-signalmodel•Switch-modeconvertersarenonlinear,time-invariantsystems2CONCE

6、PTOFPWMSWITCHINCONTINUOUSCONDUCTIONMODEac~~aia(t)ic(t)cVinVodd'=1-d~~pvap(t)vcp(t)cppVinVoCommon-passiveconfigurationaa-activeacpp-passivec-commonVinVo~i(t),v~(t)−instantaneouscurrent,voltageINVARIANTPROPERTIESOFPWMSWITCHINCCM•RelationshipbetweenterminalcurrentsandvoltagesofPWMswitchareindepende

7、ntofconvertertopologyiicciadTsdTs~~ia(t)ic(t)adcd'=1-d~~vap(t)vcp(t)p~~i(t)=ic(t)0