外文翻译---单级单刀功率因数校正器 ac dc变换器

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1、咸宁学院本科毕业论文：外文翻译电子与信息工程学院本科毕业论文(设计)外文文献翻译译文题目：single-stagesingle-switchpowerfactercorrectionAC/DCconverter学生姓名：专业：指导教师：2010年3月原文:-12-咸宁学院本科毕业论文：外文翻译Single-stagesingle-switchpowerfactorcorrectionAC/DCconverterAbstractAsingle-stagesingle-switchpowerfactorcorrectionAC/DCconverterispro

2、posedinwhichthepowerfactorcorrection(PFC)inductorisconnedtedtoatapontheprimarywindingoftheDC/DCflybackconverterstage;thereisdirectenergytransferofapartoftheinputenergytotheoutputandtheDC-busvoltagefeedback.TheadditionaldischargepathinthePFCinductorandDC-busvoltagefeedbackeffective

3、lysuppressestheDC-busvoltageandincreasestheoverallefficiency.Experimentalresultsfora60Wconverterataconstantswitchingfrequencyof70kHzareobtainedtoshowtheperformanceoftheproposedconverter.ItisshownthatthevoltageacrosstheDC-buscapacitorcanbeheldbelow405Veventhoughtheconverteroperates

4、inawiderangeofinputvoltages(90V-265VAC)andthemeasuredinputcurrentharmonicssatisfytheIEC。1IntroductionManyPFCAC/DCconvertershavebeenpresentedinrecentyears.PFCtechniquescanbedividedintotwocategories:asingle-stageapproachandatwo-stageapproach.Thetwo-stageapproachisthemostcommonlyused

5、approach.Conventionaltwo-stagePFCconvertersinvolvetheuseofcascadingtwopower-processingstages,responsibleforpowerfactorcorrectionandoutputvoltageregualtion.APFCconverterisadoptedatthefront-endtoforcethelinecurrenttrackingthelinevoltageandanotherconventionalDC/DCconverteriscascadeda

6、fterthePFCstagetoobtainthedesiredtightlyregulatedoutputvoltage.Thisapproachcanobtainverygoodperformance,suchashighpowerfactor,andlowvoltagestress.However,duetotheuseoftwopower-processingstages,conversionefficiencyisreducedandanadditionalPFCstageaddscomponentsandcomplexity.Conseque

7、ntlytheoverallcostincreases.Thetwo-stageapproachhasdisadvantagesoflowpowerdensity,controlcomplexity,andhighcost.Toreducetheoverallsizeandcost,anumberofsiglestagePFCconvertershavebeendevelopedintheliteraturewitchessothatthePFCswitchanditscontrollercanbeeliminated.Thesingle-stageapp

8、roachisspeciallyattractiveinlow-c