DCDC级联变换电路设计与实现英文文献和翻译Word格式.docx

DCDC级联变换电路设计与实现英文文献和翻译Word格式.docx

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DCDC级联变换电路设计与实现英文文献和翻译@#@DCDC级联变换电路设计与实现英文文献和翻译@#@D@#@technologyhasbecomethemainstreamofmodernelectronicdevices,powersupplysystem.Inthefieldofelectronicdevices,usuallytorectifiercalledapowerDC/DCconverterwillbecalledthesecondarypowersupply.OncetheroleofthepowersupplyissingleorthreephaseACmainstotransformanominal48VDCpowersupply.Inpowerelectronicdevicesusingatraditionalphasedpowersupplyhasbeenreplacedbyhigh-frequencyswitchingpowersupply,highfrequencyswitchingpowersupply（alsoknownastheswitchtypeRectifierSMR）MOSFETorIGBThighfrequencywork.Theswitchingfrequencyisgenerallycontrolledwithintherangeof50kHz~100kHz,highefficiencyandminiaturization.Inrecentyears,theswitchingregulatorpowercapacitycontinuestoexpand,stand-alonecapacityhasbeenexpandedtofrom48V/12.5A,48V/20A48V/200A,48V/400A.@#@AwiderangeofelectronicequipmentusedintheICpowersupplyvoltagevaries,theelectronicpowersupplysystem,theuseofhighfrequencyhighpowerdensityDC/DCisolatedpowersupplymodulefromtheintermediatebusvoltage（typically48VDC）transformintoavarietyofDCvoltage,cangreatlyreducethewearandtear,easymaintenance,installationandcompatibilizerisveryconvenient.Generalcanbedirectlyinstalledinthestandardcontrolpanel,therequirementsofthesecondarypowersupplyisahighpowerdensity.Becauseofthegrowingcapacityofelectronicdevices,powercapacitywillcontinuetoincrease.@#@DC/DCswitchingpowersupplyforitshighefficiency,highintegrationfeaturesinportableelectronicproductsinawiderangeofapplications.Withthedevelopmentofintegratedcircuittechnology,thestructureiscomplex,butthebetterperformanceofthepeakcurrentthemodePWMDC/DCswitchingpowerconvertershasbecomethemarketmainstream.@#@Classificationanddirectionofdevelopmentofswitchmodepowersupplies@#@Theswitchmodepowersuppliesistheuseofmodernpowerelectronicstechnology,tocontroltheratiooftheswitchingtransistortoturnonandofftomaintainastableoutputvoltagepowersupply.SwitchmodepowersuppliescanbedividedintotheAC/ACpowersupply,DC/DCpowersupply,AC/DCpowersupplyandDC/ACpowersupply,themostwidelyusedDC/DCswitchingpowersupply.DC/DCswitchingpowersupplyisdividedintoinductiveswitchingpowersuppliesandcapacitorswitchingpowersupply.@#@A.Inductiveswitchingpowersupply@#@Inductiveswitchingpowersupplyinductanceasthemainenergystoragecomponentstoprovideacontinuouscurrenttotheloadcanbedonethroughthedifferenttopologiesofbuck,boost,andnegativepressurefunction.Inductiveswitchingpowersupplywithveryhighconversionefficiency,theenergylossofitsworkinclude:

@#@1）internalorexternalMOSFETconductionlosses,mainlywiththedutycycleofMOSFETon-resistance;@#@2）dynamiclossincludingthepowerMOSFETturnsontheswitchinglossesanddriveMOSFETswitched-capacitorpowerlosswiththeinputvoltageandswitchingfrequency;@#@31staticloss,withIcinternalleakagecurrent.@#@Theloadcurrentislarge,theabovelossesarerelativelysmall,sotheinductiveswitchingpowersupplycanreach95%efficiency.Theselosseswillberelativelylargeraffecttheconversionefficiencydecreases,buttheload.Thedrawbackoftheinductiveswitchingpowersupplypowerprogramasawholelarger（mainlyinductorsandcapacitors）,theoutputvoltagerippleinthePCBlayouttobeextracarefultoavoidtheIftheEM（ElectroMagneticInterference）.Increasetheswitchingfrequencycaneffectivelyreducethesizeofinductorsandcapacitorsandoutputvoltageripple.@#@B.Capacitiveswitchingpowersupply-thechargepump@#@Thechargepumpistousecapacitorsasenergystoragecomponents.Theinternalswitchcontrolchargeanddischargeofthecapacitorarray.InordertoreduceEMIandrippleduetoswitching,manydesignusesadualchargepumpstructure.Thechargepumpboost,buck,andnegativepressurefunctioncanbecompleted.Becauseofthechargepumpcircuitstructurewithinreason,whentheoutputvoltageandinputvoltageintoacertainmultipleoftherelationship,suchas2timesor1.5timesthemaximumefficiencyofupto90%.Buttheefficiencywillvarywiththeratiobetweenthetwowillbeaslowas70%,shouldmakeuseofthechargepumpisthebestconversionworkingconditions.Duetothelimitationsofthestoragecapacitor,theoutputvoltageisgenerallynomorethanthreetimestheinputvoltage,outputcurrentdoesnotexceed300mA.ThechargepumpcharacteristicsbetweenLDOs（10wdropouttheregulator）andinductiveswitchingpowersupplywithhighefficiencyandrelativelysimpleperipheralcircuitdesign,EMIandripplecenter,buttheoutputvoltageandoutputcurrentlimit.@#@Theswitched-modepowersupplies,knownasenerg