论文结构框图及模块化写作2013n

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1、论文结构框图与各部分写作参考模板21I．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

2、、程序等。3）结果——实验的、研究的结果、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,

3、thedeadzonesinacinputcurrentoftraditionalbuckPFCconvertercanbeeliminated.AnimprovedconstantON-timecontrolisproposedandutilizedinthisimprovedbuckPFCconvertertoforceitthatoperatesincriticalconductionmode(CRM).Withoptimalcontrolparameters,nearlyunitpowerfactorca

4、nbeachievedandtheinputcurrentharmonicscanmeettheIEC61000-3-2classCstandardwithintheuniversalinputvoltagerange.Moreover,theefficiencyoftheproposedconverterisnotdeterioratedcomparedtotheconventionalbuckconverter.Detailedtheoreticalanalysisandoptimaldesignconsid

5、erationsfortheproposedconverterarepresentedandverifiedbya100-Wlabmadeprototype.IndexTerms—AC–DC,buckpowerfactorcorrection(PFC),classC,highefficiency,highpowerfactor(PF).AnAdaptiveOutputCurrentEstimationCircuitforaPrimary-SideControlledLEDDriverAbstract—Aprima

6、ry-sidecontrolledmethodiscommonlyusedinflybackLED21drivertoregulateoutputcurrentbyemployinganauxiliarywinding.However,owingtointrinsicpropagationdelayinreal-worldcircuits,aprimary-sidecontrolledflybackconverterexperiencesaworselineregulation.Thispaperproposes

7、asmartoutputcurrentestimationschemetoimprovelineregulationforconstanton-timecontrol,anditcanbecompatiblewiththecurrentflybacktopology.A9.5-WprototypeoftheproposedflybackLEDdriverhasbeenfabricatedinNuvotonTechnologyCorporation0.6-μm5-V/40-VCMOSprocess.Themaxim

8、umswitchingfrequencyissettoaround100kHzwithuniversal-lineinput,single-stagepowerfactorcorrectionforLEDlightingapplications.Experimentalresultsprovethattheproposedschemecanimprovethelinere