hybrid dc to dc power converter issues overview needs vs supply

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1、15HybridDCtoDCPowerConverterIssuesOverview:NeedsVs.SupplyChainAuthors:PhilipB.Gagne-T3AerospaceL.G.Zambotti-T3AerospaceJohnW.Parker-SAICKenJacobs-SAICR.J.Reaney-T3AerospaceJohnE.Pandolf-NASAJamesF.Bockman-NASAEditor:JeannettePlante–DynamicRangeCorporationPreparedfortheNASAEEEPartsAssuranceGroupMay2

2、0,200515ExecutiveSummaryOursurveyofDirectCurrenttoDirectCurrent(DCtoDC)hybridpowerconverteravailabilityforNASAsystemsuncoveredastaggeringsmallquantitythatarefullyqualifiedforspaceuseinarelativelyhealthyoverallmarket.Thelackofreuseofelectricaldesignsfurtherfrustratesourabilitytofindqualifiedproductt

3、osatisfyalloftheAgency’sconverterneeds.Technologyadvancesandnewdiscoveriesaboutsemiconductorfailuremodesintheionizingradiationenvironmentofspacecontinuetoimpedequalificationofnewpartnumbers.Somenewtechnologystrategiessuchasthemovetowardmoremodularsystemsisexpecttoimprovepartreuseandreducetheneedfor

4、newqualifiedparts.Othertechnologyadvancessuchaslowvoltage,highspeedchipswillhavetheoppositeeffect.IntroductionDCtoDCConvertersareusedincivilandmilitaryaerospaceequipmenttoprovideregulatedvoltageandcurrentsourcestosubsystemswhichareclientsofthemainsystem’spowerbus.Inatypicalsatellitesystem,thesolara

5、rraysaredesignedtoprovidea28Vmainbusvoltage.Thesubsystemsneedthatvoltageconvertedtolevelsthatareapplicabletotheirfunctionality:5.0V,3.3Vand2.5Vfordigitalsubsystemsand±12Vand±15Vforanalogsubsystems.Examplesoftypicalsatellitesubsystemloadsareacomputer,amotor,atransmitterandalaserfiringcontrolsystem.O

6、therNASAspacecraftsuchastheOrbiterandtheSpaceStation,havedifferentbusvoltageshowevertheirsubsystemsneedthesame5.0V,3.3V,±12Vand±15Vsourcevoltages.Powerandregulationrequirementsvarywidelyacrossthevarioussubsystemandspacecraftapplications.DCtoDCconvertersareprimarybuildingblocksofthepowersystemandcri

7、ticalnodesthroughouttheavionicsofaspacecraft(Figure1.).15SensorsCommand&DataHandlingProcessorMemoryCommunicationsSpacecraftSubsystemEMIFilter(internal)EMIFilter(external)+3.3VoltHybridDCtoDCConverter+5VoltH