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1、SwitchingPowerSupplyDevelopmentTrackDevelopmentofswitchingpowersupply(ReviewXuanlan)switchingpowersupply(hereinafterreferredtoswitchpower)toreplacethelinearregulatorpowertransistors(hereinafterreferredtothelinearpower)has30yearsofhistory,istheearliesttheseriess
2、witchingpowersupply,itsmainLinearpowersupplytopologiesandsimilar,butthepowertransistortoswitchtoalaterstatePWM(PWM)controltechniqueshavebeendevelopedforthecontrolswitchconverters,byPWMswitchingpowersupply,itischaracterizedbyusing20kHzfrequencyorpulsePWMaPWMswit
3、chingpowersupplyefficiencyisabout65to70percent,whiletheefficiencyoflinearpoweronly30ofa40percent.Intheeventoftheworld'senergycrisis,causedpeopletoawiderangeofcustoms.Linearpowersupplyworksinthefrequency,thefrequencyusedforthe20kHZthePWMswitchingpowersupplyalter
4、natives,couldsignificantlyconserveenergyandpowertechnologyinthehistoryofthedevelopmentcalled20kHZrevolution.WithULSIchipsizedecreases,thesizeandpowerismuchgreaterthanthemicroprocessor;spacecraft,submarines,militarypowerandswitchthebatteriesusedportableelectroni
5、cdevices(suchasmobilecomputers,mobilephones,etc.)needmoresmall,Lightweightpower.Hencetheswitchtopowerasmalllightrequirements,includingmagneticcomponentsandcapacitorsthesizeofsmallweight.Inadditionswitchingpowersupplyrequirementstohigherefficiency,betterperforma
6、nce,reliability,andsoon.China'sswitchingpowersupplyfromChina'shistoryofthedevelopmentprocessofswitchingpowersupplycanunderstandtheinternationaldevelopmentofaswitchingpowersupplyside,althoughgenerallyspeaking,China'sleveloftechnologicaldevelopmentwiththeinternat
7、ionaladvancedlevelinanaverageof5to10gap.1970s,IjoininblackandwhiteTVsets,smallandmedium-sizedcomputerinthebeginningof5V,20-200A,20kHZAC-DCswitchingpowersupply.1980sintomassproductionandextensiveapplicationstageandDevelopmentof0.5~5MHzquasi-resonantsoft-switchin
8、gpowersupply.Inthe1980s,China'scommunications(suchastheswitch-Note)intheAC-DCpowersupplyandDC-DCswitchingpowersupplyintheareaofapplicationisstillrelativelylowproportionofsix
