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1、2011沈阳理工大学XX上传摘要随着开关电源在计算机、通信、航空航天、仪器仪表及家用电器等方面的广泛应用,人们对其需求量日益增长,并且对电源的效率、体积、重量及可靠性等方面提出了更高的要求。开关电源以其效率高、体积小、重量轻等优势在很多方面逐步取代了效率低、又笨又重的线性电源。电力电子技术的发展，特别是大功率器件IGBT和MOSFET的迅速发展，将开关电源的工作频率提高到相当高的水平，使其具有高稳定性和高性价比等特性。开关电源技术的主要用途之一是为信息产业服务。信息技术的发展对电源技术又提出了更高的要求，从而促进了开关电源技术的发展。开关电源的高频变换电路形式很多,常用的变换电路有推挽、
2、全桥、半桥、单端正激和单端反激等形式。其中,在半桥式变换器电路中,变压器初级在整个周期中都流过电流,磁芯利用得更加充分。本文介绍了一款基于PWM技术的半桥式开关稳压电源。给出了高频变压器、PWM控制及驱动电路的详细设计方法及设计思路，并用该方法设计了一台输出电压可自由调节的开关稳压电源。关键词：PWM；半桥电路；开关电源IVABSTRACTWiththeswitchpowersourceextensiveuseinthefieldofcomputer,communicatebyletter,aeronauticsandastronautics,instrumentappearancean
3、ddomesticappliancesetc.,peopleincreasesbygraduallytowhoseneedamounts,havebroughtforwardhigherrequesttoaspectsuchaspowersourceefficiency,bulkfactor,andreliability.Theswitchpowersourceissmallwithit'sefficiencyheight,volume,weightmakeslightoftowaitforadvantagetohavesubstitutedtheinefficient,bothstup
4、idandseriouslinearitypowersourceinmanyaspectsstepbystep.Theelectricpowerelectronictechnologydevelopment,speciallyhighefficiencycomponentIGBTandtheMOSFETrapiddevelopment,enhancestheswitchingpowersupplyoperatingfrequencytothequitehighlevel,enableittohavethehighstabilityandGaoXingjiacomparesandsoont
5、hecharacteristic.Oneofswitchingpowersupplytechnologymainusesisservesfortheinformationindustries.Theinformationtechnologydevelopmentalsosetahigherrequesttothepowersourcetechnology,thuspromotedtheswitchingpowersupplytechnologydevelopment.Switchpowersourcehighfrequencyalternationcircuitformmany,form
6、ssuchasalternationcircuitincommonusehavingthepush-pull,entirebridge,thebridge,onlyuprightexcitingandsingleendexcitingpartlyonthecontrary.Amongthem,behitbyinhalfbridgetypesconvertercircuit,thetransformeriselementaryinentireperiodall.Thistextintroduceahalfbridgeswitchingmodepowersupply(SMPS)basedon
7、thePWMtechnology.Thedetaileddesignmethodofhighfrequencytransformer,PWMcontrolanddriveelectriccircuitanddesignwayofthinkingwereprovided,counteractedthatmethodtodesignonesetbiggestoutputthepoweras320Wofmanyroaddirectcurr
