TI 电容隔离技术详解.ppt

CapacitiveIsolationATechnicalOverview Temperature TheRealWorld Pressure Position Speed Flow Humidity Sound Light TRANSCEIVERSRS 485 CAN SignalIsolation WhatisIsolation Galvanicisolation AlthoughCircuit1andCircuit2exchangesignals nocurrent electrons passfromCircuit1toCircuit2 Whyisisolationrequiredinelectricalsystems BreakgroundloopsReducecommonmodenoiseSafetyfromhighvoltages WhyIsolation GroundLoops Morethanoneconductivepathbetweentwocircuitscreatesaground loopMultiplegroundpathsmayleadtounintendedequalizationcurrents GroundloopcanbebrokenbyDisconnectingthegroundsCommon modechokesFrequencyselectivegroundingDifferentialamplifiersGalvanicisolatorsOnlygalvanicisolationprovidesprotectionforverylargepotentialdifferences WhyIsolation CommonModeNoise SignalsreferencedtoGND1 Basic FunctionalIsolationvs ReinforcedIsolation Animprovedbasicinsulationwithsuchmechanicalandelectricalpropertiesthat initself theinsulationprovidesthesamedegreeofprotectionagainstelectricalshockasdoubleinsulation Itmayconsistofoneormorelayersofinsulationmaterial UL 60950 1 Basic FunctionalIsolationvs ReinforcedIsolation cont d WhenisReinforcedrequired 6kVppsystems e g 600VIGBTs FETs Today allMedicalapplications 5kVrms Future MedicalapplicationsforisolationfromthepatientNote thisisnotcompleteandsubjecttochange Exceptionsmayapply ApplicationsutilizingIsolation PrimaryTask IsolationbetweenHigh PowerandControlSignalsIsolationofBus NodestopreventCorruptionofthecompleteBus CommonModeRejection Industrial RoboticsPLCinput outputisolationIndustrialnetworksMotorcontrolPowersupplies ApplicationsutilizingIsolation Communications PBX PrivateBranchExchange andcentralofficeTelephoneterminalequipmentTelephoneswitchingequipmentModemsISDNEthernet PoE Medical MicrowavetherapyPatientmonitoringElectrocardiographsDefibrillators PrimaryTask Medical IsolationbetweenPowerandPatientCommunications IsolationbetweenPowerandCallerIsolationofBus NodestopreventCorruptionofthecompleteBus ConsumerElectronics Video TV VCR etc PlasmadisplaysElectronicgamingHomeappliances ApplicationsutilizingIsolation Computers OfficeEquipmentIsolatedI OPrintersandplottersFaxmachines PrimaryTask IsolationbetweenHigh PowerandUser Nomenclatures Definitions 1 3 OperationVoltage VoltagethatmaybeappliedcontinuouslyacrosstheIsolationbarrier mostly560Vpkor890VpkTransientVoltage Voltagethatmayoccurtemporarilyacrossthebarrier testedperVDEfor1minute mostly4kVpk relatesto3kVrmsperUL astestedfor10sonly or6kVpkSurgeVoltageSingleeventsurge withtheassumptionthatalleffectshavebeenrecoveredfrompriortoanothersurge event mostlyratedfora10kVsinglepeak Nomenclatures Definitions 2 3 Basic FunctionalIsolation Assumesasinglelevelofisolationwithacertainstrength ApplicableformostapplicationsinindustrialforfieldbussesandAC equipmentupto400Vrms andforconsumerelectronics Mostlyratedat560Vpkcontinuous 4kVpktransientvoltage Reinforced DoubleIsolation DoubleIsolationassumesatwo levelisolationwithacertainstrengtheach Reinforcedaddressesasinglelevelofisolationthat however providesthesamereliabilityasthetwo layer ApplicableformostmedicalapplicationsandAC equipmentabove400Vrms Mostlyratedat890Vpkcontinuous 6kVpktransient 10kVsurgevoltage Medicalneeds5kVrmstransient IntrinsicallysafeApplicationsdemanddoubleisolation Note theEnd equipment standard e g IEC 60950forcommunicationsorIEC 60601 1formedical dictateswhatisneededonsiliconlevel Nomenclatures Definitions 3 3 CommonModeTransientSuppression DiscussesthequickchangeinReferencepotentialprimarytosecondary It sgivenasthedU dtuptowhichnofalsetoggelingoftheoutputwilloccur e g 35kV us Usuallyscales linearlywithVcc CreepageandClearanceDiscussesthesurface distancethatmayconductifwet polluted respectivelytheair distance For560V 4kVmostly4mmissufficient for890V 6kVmostly8mmisneeded Dependsonpollutiondegree 5Questions toalloweducatedsolution proposalsIsolationstrength basic reinforced Isolationvoltage 4kVpeak 560Vpeakcontinuos 6kVpeak 890Vpeakcontinous Stand aloneisolationorintegration Transceiver Gate Driver Data Converter SupplyVoltages Channel count NewGenerationCapacitiveIsolation Highvoltagecapacitor Isolatorconstruction Creepagedistance Shortestdistancebetweentwoconductiveinputtooutputleadsmeasuredalongsurfaceofinsulation Clearancedistance Shortestdistancebetweentwoconductiveinputtooutputleadsmeasuredthroughair lineofsight Note Package changedandnowallows8 3mmmin ActualDie Picture It sallcapacitive AllisolatedcouplerscanbemodeledasI Oandcapacitivecoupled activeorparasitic Source TIAppnoteSLLA Timingparameters CompetitiveComparisonReliability 1 2 CompetitiveComparisonReliability 2 2 Samplesize failures ISO721 45447 0 ADuM1201 35411 1 HCPL 0721 160 0 CompetitiveComparisonMagneticImmunity IEC61000 4 81KHzFieldFrequency106xhigherImmunitythanADUM1100 Source TIAppnoteSLLA181A Clickonabovelinkforwebinfo E fieldimmunityTestReport E fieldimmunityTestReport Magnetic ISO7221C 1Mbps ComparisonofRadiatedNoiseSpectrum AntennaHorizontal Magnetic 1Mbpsoperation 5VVcc ISO7221 1Mbpsoperation 5VVcc EN55022ClassBRadiationsTesting 25Mbps ComparisonofRadiatedNoiseSpectrum AntennaHorizontal Magnetic 25Mbpsoperation 5VVcc ISO7221 25Mbpsoperation 5VVcc EN55022ClassBRadiationsTesting CompetitiveComparisonHighVoltageLifetime Source TIAppnoteSLLA CompetitiveComparisonHighVoltageLifetimeUsingwidelyacceptedE Modelmethodology ADUM1100 ISO72x ISO72x Lifeexpectancyis28yearsat560Vpeakor400Vrms Competition Lifeexpectancy 10years 240partssince12 15 05 1000Vrms0failsafter 30kh IccComparison FigureofMerritt BandwidthperSupplyCurrent CompetitiveComparisonPowerUp Down TIMakesIsolatorsEasytoUse GetStartedTodayEvaluationmodulesSamplesApplicationssupportIBISmodelsDatasheetsTechnicaldocumentationApplicationnoteson High VoltageLifetimeMagneticFieldImmunityISO72xFamilyofDigitalIsolatorsComplementsTI sindustrialproductportfolio interface dataconverter DSP MCU amplifier power logic IsolatedProducts Stand Alone Singles Triples Quads Duals ISO7240A C MISO7241A C MISO7242A C M ISO7230A C MISO7231A C M ISO7220A B C MISO7221A B C M ISO721 MISO722 M Triples Quads Duals ISO7440MISO7441M ISO7430MISO7431M ISO7420MISO7421M ISO7640MISO7641M ISO7630MISO7631M ISO7620MISO7621M 560Vpk cont 4kVpk transient 890Vpk cont 6kVpk transient 10kV surge tbc Availabletoday Low Power versions pin compatiblewithISO72xx 560Vpk cont 4kVpk transient ClickonProductformoreinformation IsolatedProducts Integrated 2ndorderD SModulator 4kV AMC120310MHz ISO1176 ISO308x ISO1x ISO3x IsolatedTransceiversRS 485 ClickonProductformoreinformation 2ndorderD SModulator 6kV AMC120420MHz IsolatedRS 485TransceiverwithIntegratedTransformerDriver ISO1177 RTM 1Q10Samples 1Q10 IsolatedCANTransceiver ISO1050 Preview Cross ReferencetoADI SeeESPunder productfamilypresentations intheisolationproduct folders Continued alsoinspeakernotes SingleChannelSignalIsolators ISO72x 4000VpeakIsolation560VpeakcontinuousSignalingRateOptions ISO721B 5Mbps ISO721 100Mbps ISO721M 150Mbps UL1577 IEC60747 5 2 VDE0884 Rev 2 IEC61010 1andCSAApproved3 3V 5VOperation anycombination 25kV sTransientImmunityandHighElectromagneticImmunityFailsafeOutputandHighImpedanceatInputandOutputwithLowVcc Multi ChannelStand aloneIsolators Duals xdesignatesspeedoption A 1Mbps B 5Mbps C 25Mbps M 150Mbps Multi ChannelStand aloneIsolators Triples x x xdesignatesspeedoption A 1Mbps C 25Mbps M 150MbpsAllinDWpackage x x Multi ChannelStand aloneIsolators Quad channel xdesignatesspeedoption A 1Mbps C 25Mbps M 150MbpsAllinDWpackage x x x Isolated485Transceivers ISO308x ISO1x ISO3x StandardRS 485 3 3Vand5Vhalf duplexandfull duplex 176and 180configuration 1Mbpsand25MbpsnoIDODEoutput ISO1176 IsolatedRS 485ProfiBus5Vhalf duplex25MbpsoptimizedforProfibus ApplicationsISODEavailable IsolatedCANTransceiver ISO10505VCANtransceiverISO11898compliant3 3V 5VisolatedlogicinterfaceHighEMImmunity15kV ustransientimmunityBusfaultprotectionof 27Vto40VDominanttimeoutfunctionThermalShutdownprotectionHighInputimpedancewithlowVcc1Mbps ISO 485withTransformerDriverSimpleCompleteSolution ISO1177 ISO37 ISO3088 1Mbps 20Mbps 40Mbps1 8Unitload 256nodesonabusGlitch FreeFailsafe Open Shorted Idle SiliconIntegratedSi