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1、DC-DCconverter(DC/DC)converteriswidelyusedinremoteanddatacommunications,computer,officeautomationequipment,industrialinstrumentation,military,aerospaceandotherfieldsrelatedtothenationaleconomyallwalksoflife.Dividedbythesizeoftheratedpower,theDC/DCcanbedividedinto750W,750W
2、1Wand1Wtothefollowingthreecategories.Inthe1990s,thegrowthrateoftheDC/DCconverterinlowpowerrangegreatlyimproved,6Wof~25WDC/DCconvertergrowthrate,thisisbecausetheyareusedextensivelyforDCmeasurementandtestequipment,computerdisplaysystems,computersandmilitarycommunicationssys
3、tems.Bythelow-powerhigh-speedmicroprocessors,DC/DCconvertertothedirectionofthepowerdevelopmentisaninevitabletrend,sothefastergrowthrateof251W~750WDC/DCconverter,whichitisusedservicesofmedicalandlaboratoryequipment,industrialcontrolequipment,telecommunicationsequipment,mul
4、ti-channelcommunicationandtransmissionequipment,DC/DCconverterinthefieldofremoteanddigitalcommunicationshasbroadapplicationprospects.DC/DCconverterwilltransformafixedDCvoltagetoavariableDCvoltage,thistechniqueiswidelyusedinthetrolleybus,subway,trains,electriccarscontinuou
5、slyvariabletransmissionandcontrol,whilemakingtheabovecontrolhasacceleratedstablerespondquicklytoperformance,andatthesametimereceivetheeffectofsavingenergy.DCchopperinsteadoftherheostatsavings20%to30%oftheenergy.DCchoppercannotonlyplaytheroleoftheregulator(SMPS),canalsopla
6、yaroleeffectivelysuppressthenoiseofthegridsideharmoniccurrent.DC/DCconverterhasbeencommercialized,themoduleuseshigh-frequencyPWMtechnology,theswitchingfrequencyisabout500kHz,thepowerdensityof0.31W/cm3~1.22W/cm3.WiththedevelopmentoftheLSI,thepowersupplymoduletoachievethemi
7、niaturizationisnecessarytocontinuouslyimprovetheswitchingfrequencyandanewcircuittopology.Atpresent,somecompanieshavealreadydevelopedandproducedthesecondzero-currentswitchingandzerovoltageswitchingpowersupplymodule,powerdensityhasdramaticallyincreased.Therapiddevelopmentof
8、theelectronicsindustryhasgreatlypromotedthedevelopmentoftheswitchingpowersupply.Thehigh-frequenc
