BUCK开关电源中关键控制电路的设计

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1、西南交通大学硕士学位论文Buck开关电源中关键控制电路的设计姓名：孙毛毛申请学位级别：硕士专业：微电子学与固体电子学指导教师：冯全源20070401西南交通大学硕士研究生学位论文第lI页AbstractAstheheartoftheelectronicsystem．thepowersupplydevelopsfastwiththefastdevelopmentoftheelectricdevices，andtherequirementismoreandmorehigh．Theswitchmodepowersupply(

2、SMSP)iscalledasthehighefficiencypowersupply．Ithasmanyvirtuessuchaswidestableoutputranges，largepowerdensityratio．1ightnessandgoodperformance．Itsfewerlossesontheswitchbringithighefficiencycomparedwiththelinearregulator．Thehighestefficiencyoftheswitchmodepowersuppl

3、ycouldbeabove90％anditiswidelyusedintheportableapplications．Therefore．itjsofgreatimportancetoresearchintotheswitchmodepowersupply．ThepaperissupportedbyNationScienceFoundationofChinaandSichuanProvinceAcademicFoundation．ThebasicprincipleandcontroltechniquesofDC·DCb

4、uckconvertersaredescribedindetail．Theadvantagesanddisadvantagesofthecontrolmethodsareanalyzedandcompared,andwhereeachmethodismoreadaptedtoispointedout．ThekeycontrolcircuitsbasedonDC-DCbuckconverterincurrentcontrolmodewhichisusedinmobileapplicationsandportableapp

5、licationsaredesigned：thePWMsum—comparatorandthecurrentcontrolcomparatorofsynchronousreifications．Theoperationalprinciple，structureandsmallsignalcharacterareparticularlyanalyzed．TosolvetheproblemsinPWMCurrentmodemethod，aslopecircuitbasedontheprincipleofslopecompe

6、nsationisdesigned．ThePWMcontrolcircuitisthecoreofconverterswhichrealizedthecontrolalgorithm．Itsperformanceisveryhnportantinconverters．Thelowpowerlossessynchronousreification(SR)iswidelyappliedinlowpowerDCconverters．TheSRcontrolmethodcaneffectivelysolvetheproblem

7、thattheefficiencyistoolowinlightloads．AnewtypeofPWMcomparatorsisdesigned：thesum—comparator．Itreplacestheerroramplifierandimprovestheperformance：thegainisapproximately120DB．Andthecurrentcontrolcomparatorofsynchronousreificationscanadjustthethresholdtotheload．Itsg

8、ainisapproximately96DB．西南交通大学硕士研究生学位论文第1II页ThecircuitsaredesignedinBiCMOS0．6urnprocess．SimulatethecircuitswithHSPICEandtheresultsindicatethatthedesignhaveachievedthee