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ID:50680065
大小:1.67 MB
页数:21页
时间:2020-03-13
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1、论文结构框图与各部分写作参考模板I.题目及摘要Title必须清晰简短(clear,short)Abstracts是paper的一个缩写(miniatureofwholepaper),一定要简明扼要(lessthan200words),按照paper的顺序介绍主要研究对象(subject)、设计(design)、方法步骤(procedures)以及最后结果(results)。1)目的——研究、研制、调查等的前提、目的和任务,所涉及的主题范围。2)方法——所用的原理、理论、条件、对象、材料、工艺、结构、手段、装备、程序等。3)结果——实验的、研
2、究的结果、数据,被确定的关系,观察结果,得到的效果、性能等。4)结论——结果的分析、研究、比较、评价、应用,提出的问题等。AnImprovedBuckPFCConverterWithHighPowerFactorAbstract—Animprovedbuckpowerfactorcorrection(PFC)convertertopologyisproposed(presented)inthispaper.Byaddinganauxiliaryswitchandtwodiodes,thedeadzonesinacinputcurrentof
3、traditionalbuckPFCconvertercanbeeliminated.AnimprovedconstantON-timecontrolisproposedandutilizedinthisimprovedbuckPFCconvertertoforceitthatoperatesincriticalconductionmode(CRM).Withoptimalcontrolparameters,nearlyunitpowerfactorcanbeachievedandtheinputcurrentharmonicscanmee
4、ttheIEC61000-3-2classCstandardwithintheuniversalinputvoltagerange.Moreover,theefficiencyoftheproposedconverterisnotdeterioratedcomparedtotheconventionalbuckconverter.Detailedtheoreticalanalysisandoptimaldesignconsiderationsfortheproposedconverterarepresentedandverifiedbya1
5、00-Wlabmadeprototype.IndexTerms—AC–DC,buckpowerfactorcorrection(PFC),classC,highefficiency,highpowerfactor(PF).AnAdaptiveOutputCurrentEstimationCircuitforaPrimary-SideControlledLEDDriverAbstract—Aprimary-sidecontrolledmethodiscommonlyusedinflybackLEDdrivertoregulateoutputc
6、urrentbyemployinganauxiliarywinding.However,owingtointrinsicpropagationdelayinreal-worldcircuits,aprimary-sidecontrolledflybackconverterexperiencesaworselineregulation.Thispaperproposesasmartoutputcurrentestimationschemetoimprovelineregulationforconstanton-timecontrol,andi
7、tcanbecompatiblewiththecurrentflybacktopology.A9.5-WprototypeoftheproposedflybackLEDdriverhasbeenfabricatedinNuvotonTechnologyCorporation0.6-μm5-V/40-VCMOSprocess.Themaximumswitchingfrequencyissettoaround100kHzwithuniversal-lineinput,single-stagepowerfactorcorrectionforLED
8、lightingapplications.Experimentalresultsprovethattheproposedschemecanimprovethelineregula
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