论文结构框图和模块化写作2013n.docx

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(miniature of whole paper)，一定要简明扼要(less than 200 words)，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。An Improved Buck PFC Converter With HighPower FactorAbstract—An improved buck power factor correction (PFC) converter topology is proposed （presented）in this paper. By adding an auxiliary switch and two diodes, the dead zones in ac input current of traditional buck PFC converter can be eliminated. An improved constant ON-time control is proposed and utilized in this improved buck PFC converter to force it that operates in critical conduction mode (CRM).With optimal control parameters,nearly unit power factor can be achieved and the input current harmonics can meetthe IEC61000-3-2 class C standard within the universal input voltage range. Moreover, the efficiency of the proposed converter is not deteriorated compared to the conventional buck converter. Detailed theoretical analysis and optimal design considerations for the proposed converter are presented and verified by a 100-W labmade prototype.Index Terms—AC–DC, buck power factor correction (PFC),class C, high efficiency, high power factor (PF).An Adaptive Output Current Estimation Circuitfor a Primary-Side Controlled LED DriverAbstract—A primary-side controlled method is commonly used in flyback LED driver to regulate output current by employing an auxiliary winding. However, owing to intrinsic propagation delay in real-world circuits, a primary-side controlled flyback converter experiences a worse line regulation. This paper proposes a smart output current estimation scheme to improve line regulation for constant on-time control, and it can be compatible with the current flyback topology. A 9.5-W prototype of the proposed flybackLED driver has been fabricated in Nuvoton Tech