深究各式电源分析与 USB PD 测试应用.pdf

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1、PowerAnalysisIn-DepthandUSB-PDTechnology深究各式電源分析與USB-PD測試應用AlvinDingBusinessDevelopmentManagerAgendaıPowerElectronicsMeasurementsandAnalysisProbingTechniques–What’sright,what’swrong,what’susefulSignalenhancementmethods–GettingthemostoutofyoursignalReal-wo

2、rldpowerelectronicsmeasurementsRipple&Noise/SpectrumStepResponseVerifyingSOAMeasuringconversionefficiencyıUSBPowerDelivery2ProbingTechniquesProbeCompensationUnder-CompensatedSignalProperlyCompensatedSignalProbeTipScopeBNCinputOver-CompensatedSignalTomain

3、tainprobeattenuationratiooveritsratedbandwidth4ProbingTechniquesWrongContactingtheDUTıLotsofaccessory–noteverythinggoodforpowermeas.RightActualSignalRinging5DifferentialprobesMeasurementwithoutgroundconnectionWhenaretheyneeded?Whatisimportant?ıWhenaretheynee

4、ded?MeasurementwithnogroundreferenceGroundloopproblemsıWhatisimportant?DifferentialprobesalwayshaveanoffseterrorInparticularimportantforhigh-voltageprobesCompensateifhighaccuracyneededDifferentialprobingonbatteryoperatedsystemsneedsanadditionalgroundco

5、nnectionIfnotdoneNoisemightbecaptured(e.g.50Hz)OffsetadjustonRT-ZD016ProbingTechniquesUsefulFeaturesofActiveProbesıProbeMeter–IntegratedDCvoltmeterinactiveprobes16-BitADCwithDCmeasurementaccuracyof0.1%Independentoftheinstrumentsettings,inparallelwiththem

6、easurementchannelApplication:VerificationofFPGApowersupplies.7ProbingTechniquesSkewbetweenVoltageandCurrentProbeıDifferentpropagationdelaybetweenvoltageandcurrentprobe500MHzpassive(voltage)probe100MHzcurrentprobeVoltagepulseCurrentpulse~10nsdelay!8ProbingTec

7、hniquesWhydeskewingıMeasuringSwitchingLossPositivevoltagevscurrentpulseskewPositivevoltagevscurrentpulseskewNegativevoltagevscurrentpulseskewDeskewed,accuratemeasurementPowermeasurementtoolowPowermeasurementtoolowPowermeasurementtoohighDeskewingwithreference

8、voltageandcurrentpulsesisessentialforaccuratepowermeasurements9ProbingTechniquesHowtodeskewRT-ZF201.Useappropriatevoltage/currentpulseManualAutomatic(K31)(e.g.R&SRT-ZF20deskewfixture)2.Connectcu