DCDC级联变换电路设计与实现英文文献和翻译.docx

DCDC级联变换电路设计与实现英文文献和翻译.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

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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