14和开关电源的电磁兼容设计技术

CPSSCSomekeyEMCdesigntechniquesCPSSCSomekeyEMCdesigntechniquesinSMPS（Dr.）报告人：和Jun,26,2010ShenzhenCityhejun@内容内容性能及其EMI发射的抖频参数设计引起的发射波动及Jun,26,2010Hejunping开关电源主要EMC性能与设计技术CPSSC一.传导测试测试50uHL0.1uFSMPS50OhmG50Ohm50uH0.1uFNLISNEMIreceiverFlybacktotalJun,26,2010Hejunping开关电源主要EMC性能与设计技术CPSSC一.传导测试测试50uHL0.1uFSMPS50OhmG50Ohm50uH0.1uFNLISNEMIreceiverFlybacktotalJun,26,2010HejunpingCPSSC辐射发射测试ChamberSMPS80cm450uHOutputcableInputcable0.47uF220μFicm1icm2MPFCEMIreceiverJun,26,2010HejunpingCPSSC辐射发射测试ChamberSMPS80cm450uHOutputcableInputcable0.47uF220μFicm1icm2MPFCEMIreceiverJun,26,2010HejunpingCPSSC雷击浪涌测试信号电缆用的耦合解耦网络Jun,26,2010HejunpingCPSSC雷击浪涌测试信号电缆用的耦合解耦网络接辅助设备接电网EUT与发生器或耦合器之间的电缆小于2米保护地线要能够承受浪涌电流ESD测试Jun,26,2010HejunpingCPSSCEMIReductionTechniquesforPowerElectronicSystemsEMIReductionFilterControlTopologyStructureDriveCircuitSoftSwitchingPassiveActiveSnubbershieldingFrequencymodulationForwardFeedbackBalancingGroundingJun,26,2010HejunpingCPSSCEMIReductionTechniquesforPowerElectronicSystemsEMIReductionFilterControlTopologyStructureDriveCircuitSoftSwitchingPassiveActiveSnubbershieldingFrequencymodulationForwardFeedbackBalancingGroundingJun,26,2010HejunpingCPSSC二.开关电源EMI滤波器的协调设计TopologiesJun,26,2010HejunpingCPSSC二.开关电源EMI滤波器的协调设计Topologies:Howtodesignthefilterinashortdesigncycle?&Howtoimprovethefilterperformance?Jun,26,2010HejunpingCPSSCInputFilterDesignF)mF)r(F)NoiseImpedance:Cps10pImprovetheDesignProgram(<1MHz)Csg150pCy04700pFilterSpec:(F)Csum13500pfstop195kILneed20(Hz)InputtheFilterSpec(dB)Inductors_sumvs.FilterTopology1001030.10.01CalculatetheTotalInductanceofEachTopologyLLn131104110105110512345LLn0FilterTopology678910101TotalInductance InsertionLossEvaluation 20SelecttheSuitableOne20020IL4fL440L6080100ILCurveAnalysis1201204567811011011011011030M10kf[Hz]InductorsumIL(dB)00010.0521?0-1536.261?0-347.302?0-451.526?0-360.01170.01281.393?0-390.014102.105?0-3Jun,26,2010HejunpingCPSSCInputFilterDesignF)mF)r(F)NoiseImpedance:Cps10pImprovetheDesignProgram(<1MHz)Csg150pCy04700pFilterSpec:(F)Csum13500pfstop195kILneed20(Hz)InputtheFilterSpec(dB)Inductors_sumvs.FilterTopology1001030.10.01CalculatetheTotalInductanceofEachTopologyLLn131104110105110512345LLn0FilterTopology678910101TotalInductance InsertionLossEvaluation 20SelecttheSuitableOne20020IL4fL440L6080100ILCurveAnalysis1201204567811011011011011030M10kf[Hz]InductorsumIL(dB)00010.0521?0-1536.261?0-347.302?0-451.526?0-360.01170.01281.393?0-390.014102.105?0-3Jun,26,2010HejunpingCPSSCOutputFilterDesignGivetheNoiseModel(>1MHz)InputNoise1LCase12lineL/NLCM_OutZLCM_Out<<ZCS_GCMNoisedoesn’tchangedmuch.LlineGChassisCS_GGroundInputNoiseCase21L2lineL/NZCY_Out<<ZCS_GCMNoiseisdecreased.CY_OutLlineJun,26,2010HejunpingCPSSCOutputFilterDesignGivetheNoiseModel(>1MHz)InputNoise1LCase12lineL/NLCM_OutZLCM_Out<<ZCS_GCMNoisedoesn’tchangedmuch.LlineGChassisCS_GGroundInputNoiseCase21L2lineL/NZCY_Out<<ZCS_GCMNoiseisdecreased.CY_OutLlineGChassisCS_GGroundJun,26,2010HejunpingCPSSCOutputFilterDesignInputNoise1Lline2L/NCase3LCM_OutZLCM_Out<<ZCS_GThesameasCase2.LlineCY_OutGChassisCS_GGroundInputNoise1LCase42lineL/NLCM_OutCMNoiseisdecreasedmore.LlineCY_OutGThisisthebest.ChassisCS_GGroundJun,26,2010HejunpingCPSSCOutputFilterDesignInputNoise1Lline2L/NCase3LCM_OutZLCM_Out<<ZCS_GThesameasCase2.LlineCY_OutGChassisCS_GGroundInputNoise1LCase42lineL/NLCM_OutCMNoiseisdecreasedmore.LlineCY_OutGThisisthebest.ChassisCS_GGroundJun,26,2010HejunpingCPSSCExperimentalResultsThetestresultsJun,26,2010HejunpingCPSSCExperimentalResultsThetestresultscomefromtheformerdebugon220v-3kwUPS.Cy_outremovedCy_outrestoredCy_outrestoredLcm_outshortedLcm_outshortedLcm_outrestoredBestBetterJun,26,2010Hejun三.降低EMI发射的抖频参数设计••FrequencyjittercanlowerEMIinSMPSToexactlypredictthenoisereductionandoptimizetheparametersoffrequencyjitter,theeffectofEMIreceivermustbeconsidered–3.9dB–12.9dBSpectrumofmodulatedsignalinEMItest020Originalsinsignalwithfsw=50kHz40CalculatedspectrumofmodulatedsignalwithoutconsidertheeffectofJun,26,2010Hejun三.降低EMI发射的抖频参数设计••FrequencyjittercanlowerEMIinSMPSToexactlypredictthenoisereductionandoptimizetheparametersoffrequencyjitter,theeffectofEMIreceivermustbeconsidered–3.9dB–12.9dBSpectrumofmodulatedsignalinEMItest020Originalsinsignalwithfsw=50kHz40CalculatedspectrumofmodulatedsignalwithoutconsidertheeffectofEMIreceiver604.510451045.5104f[Hz]Amplitude[dB]Jun,26,2010HejunpingCPSSC•SincarriersignalS1(t)ModulatedsignalF(t)S1(t)Vm1sin(2fct)SinmodulatingsignalS2(t)F(t)Vm1sin2fctS2(Jun,26,2010HejunpingCPSSC•SincarriersignalS1(t)ModulatedsignalF(t)S1(t)Vm1sin(2fct)SinmodulatingsignalS2(t)F(t)Vm1sin2fctS2(t)FrequencyofF(t)FMS2(t)sin(2fmt)fmaxd2ftS2(t)1f(t) c dtF(t)f(t)fcfmcos2fmtPeakfrequencydeviationΔfpk001d(S2(t))/dtf010.0010.0020.0030.004ftfmax min00.0010.002 0.03/(2.04pk2tfpkfminJun,26,2010Hejun(fcfModulatedsignalF(t)CarriersignalS1(t)t t(F)1)m0BB40fc=10kHz8010918 1910f[kHz]11128910f[kHz]1112fm f[kHz]fm fm=100Hz&β=10fm=400Hz&β=2.5fm=100H&β=2.5Theeffectivebandwidth(B)ofmodulatedsignal(fmB 2m)Amplitude[dB]BJun,26,2010Hejun(fcfModulatedsignalF(t)CarriersignalS1(t)t t(F)1)m0BB40fc=10kHz8010918 1910f[kHz]11128910f[kHz]1112fm f[kHz]fm fm=100Hz&β=10fm=400Hz&β=2.5fm=100H&β=2.5Theeffectivebandwidth(B)ofmodulatedsignal(fmB 2m)Amplitude[dB]BJun,26,2010HejunpingCPSSC•β:maximumphaseangleshiftinmodulatedsignalandamplitudeJun,26,2010HejunpingCPSSC•β:maximumphaseangleshiftinmodulatedsignalandamplitudeofmodulatingsignalΔfpk:peakfrequencyderivationandamplitudeofderivateofmodulatingsignalfm:frequencyofmodulatingsignalB:effectivebandwidthofmodulatedsignal•••S1(t)Vm1sin(2fct)fpkfmB2(1)fmF(t)Vm1sin(2fctsin(2fmt))S2(t)sin(2fmt)Jun,26,2010HejunpingCPSSCSinusoidalsignalmodulatedbythreemodulatingsignalTriangularSinusoidalExponential0Peak100amplitudereduction2004050f[kHz]604050f[kHz]604050f[kHz]60fcTriangularmodulatedsignalhasthemaximumflatside-bandharmonicsspectrumAmplitudeJun,26,2010HejunpingCPSSCSinusoidalsignalmodulatedbythreemodulatingsignalTriangularSinusoidalExponential0Peak100amplitudereduction2004050f[kHz]604050f[kHz]604050f[kHz]60fcTriangularmodulatedsignalhasthemaximumflatside-bandharmonicsspectrumAmplitude[dB]fc=50kHzβ=50Jun,26,2010HejunpingCPSSCPeakAmplitudeReductionvs.β010β=420trifc=65kHzexpsin300.1110100•ThereductionincreasesasβincreasesTrimodulatedsignalhasthemaximumreductionespeciallywhenβ>4Amplitudereduction[dB]Jun,26,2010HejunpingCPSSCPeakAmplitudeReductionvs.β010β=420trifc=65kHzexpsin300.1110100•ThereductionincreasesasβincreasesTrimodulatedsignalhasthemaximumreductionespeciallywhenβ>4Amplitudereduction[dB]Jun,26,2010HejunpingCPSSC000555101010151515202020250.1250.1250.1110100110100110100000555101010151515202020250.1250.1250.1110100110100110100triexpsinThereductionisonlythefunctionofβAmplitudereduction[dB]fm=500Hzfm=200Hzfm=100Hzfc=100kHzfm=500Hzfm=200Hzfm=100Hzfc=65kHzJun,26,2010HejunpingCPSSC000555101010151515202020250.1250.1250.1110100110100110100000555101010151515202020250.1250.1250.1110100110100110100triexpsinThereductionisonlythefunctionofβAmplitudereduction[dB]fm=500Hzfm=200Hzfm=100Hzfc=100kHzfm=500Hzfm=200Hzfm=100Hzfc=65kHzJun,26,2010HejunpingCPSSCEMIReceiver’sEffectJun,26,2010HejunpingCPSSCEMIReceiver’sEffectonFMThemostimpotentpartsinEMIreceiver’smodelareintermediate-frequency(IF)filteranddetectorIFfilterhasaresolutionbandwidthRBW,whenspectralcomponentscloserinfrequencythanRBWofIFfilterwillcreateabeatnoteAVdetectortakesanenvelopedetectedsignalandpassesitthroughalow-passfilterAVdetectorIFfilterJun,26,2010HejunEquivalentIFFilterTheequivalentlowpassapproximationofIFfilterisdefinedasbelow:122ω2020.5ωJun,26,2010HejunEquivalentIFFilterTheequivalentlowpassapproximationofIFfilterisdefinedasbelow:122ω2020.5ω200Bπ,B9kHz066201040f[Hz]Resolutionbandwidth(RBW)ofIFfilteris9kHzSpectrumofthesignaloutputofIFfilter8Amplitude[dB]IF(w)9kHzJun,26,2010HejunpingCPSSCEMIReceiver’sModelVd(t)IF()VIF(t)V(t)IF()Jun,26,2010HejunpingCPSSCEMIReceiver’sModelVd(t)IF()VIF(t)V(t)IF()Vq(t)2sin(2ft)V(t)’sfrequencyresponseofEMIanalyseratfrequencyof“f”vd(t)2vq(t)21 0.020.02VIF(t)dt02cos(2ft)Jun,26,2010HejunpingCPSSCRBWJun,26,2010HejunpingCPSSCRBWofEMIReceiverandfmWhenfm>RBW,thepeakamplitudereductionisonlythefunctionofβWhenfm<RBW,theBismoreactiveinlowerEMIthanβ,andthereductionlevelisthefunctionofbothβandfm.Inswitchingpowersupplyasthelimitoftheminimumoperatingfrequency,fmisusuallyseveralhundredorkiloHzlessthanRBWJun,26,2010HejunpingCPSSCBandwidthofModulatedSignalInSMPSnoisesignalisalmosttrapezoidSpectrumofatrapezoidsignalSpectrumofmodulatedtrapezoidsignal0050501001000100200f[kHz]30040050050100150200250f[kHz]ThebandwidthJun,26,2010HejunpingCPSSCBandwidthofModulatedSignalInSMPSnoisesignalisalmosttrapezoidSpectrumofatrapezoidsignalSpectrumofmodulatedtrapezoidsignal0050501001000100200f[kHz]30040050050100150200250f[kHz]Thebandwidthofmodulatedsignalatn-orderharmonic(Bn)is:Bn2(n1)fmModulatedsignalathigherharmonicswillhavelargerbandwidthandmorepeakamplitudereductionwhenoverlapdoesn'thappensAmplitude[dB]Amplitude[dB]Jun,26,2010HejunpingCPSSCOptimumParametersSelectionTestcondition:carriersignalisasquarewaveandfc=65kHzmodulatingsignalistriangularPeakamplitudereductionatthird-orderharmonicofasquaresignalfm [Hz]501004006007008009001k2kΔfpk[Hz]2k3k5.05.0Jun,26,2010HejunpingCPSSCOptimumParametersSelectionTestcondition:carriersignalisasquarewaveandfc=65kHzmodulatingsignalistriangularPeakamplitudereductionatthird-orderharmonicofasquaresignalfm [Hz]501004006007008009001k2kΔfpk[Hz]2k3k5.05.04.53.5k6.16.05.64k4.5k5k10k15.014.114.4Maxreductionandmaxmatseleted52ß=0Jun,26,2010HejunpingCPSSCOptimumJun,26,2010HejunpingCPSSCOptimumParametersSelectionWhenfmisselected,theamplitudereductionincreaseswithβ(orΔfpk)increases;WhenΔfpkisselectedandB>RBW,thelowerfmthelargerreductionWhenΔfpkisselectedandB<RBW,theamplitudereductionisnotinverseproportionwithfm,thereisatrade-offbetweenmaximumreductionandmaximumfm.Theoptimalfmcanbeselectedinthelook-uptableoftheexperimentalresultsJun,26,2010HejunpingCPSSC•ADP-65JP:65Wflybackadapter,PWMcontrollerisJun,26,2010HejunpingCPSSC•ADP-65JP:65Wflybackadapter,PWMcontrollerisDAP008•DAP008isDelta’sspecificdeviceorderedfromONSemi,ithasbuilt-infrequencyjitterforlowerEMI•ParametersofjitterinDAP008–Δfpk=3kHz–fm=100HzJun,26,2010HejunpingCPSSC•Inordertokeepthesecond-orderharmonicofthenoiseoutoftheconductedEMImeasurementrange(0.15-30MHz),Δfpkhastobelimitas:Jun,26,2010HejunpingCPSSC•Inordertokeepthesecond-orderharmonicofthenoiseoutoftheconductedEMImeasurementrange(0.15-30MHz),Δfpkhastobelimitas:2265k150k9k265kHz130kHzBfmB22(2fpk1)fmB2fmf5.5kpkB2 422•AnotherlimitonΔfpkistheminimumoperatingfrequencyofthepowersupplyΔfpkisslectedabout4kHz,andfmisselectedequalto1