低压大电流同步整流DCDC转换器设计

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毕业设计(论文)低压大电流同步整流DC/DC转换器设计完成日期2015年12月25日系别:机电信息学院专业名称:电气工程及其自动化学生姓名:张康学号:1202030114指导教师姓名、职称:张成民高级工程师I低压大电流同步整流DC/DC转换器设计摘要进入21世纪后,微电子技术、互联网技术、集成电路,和信息技术发展得非常快速。集成电路芯片和数字信号处理器的大规模被普及应用在手机,笔记本电脑,工作站等的场合中。小功率的DC-DC变换器广泛的使用在计算机、各种诸如手机,笔记本电脑等便携的电子产品。电子产品的精密化,小型化要求供电电源必须可以输出更低的电压、更大的大输出电流、而且必须保证功率密度高、效率更高、稳定性及具有快动态响应来满足以上的各种场合要求的快速、更加高效的数据处理速度。按照低压大电流输出的DC/DC转换器的特点,我们了解到效率问题是变换器中的重要表现,经过对同步整流的原理和特点的分析,重点说明了低功率场合中自驱动同步整流的各种优势,对于自驱动同步整流,分析介绍了各种与之相结合电路拓扑后,我们发现必须给出一种新的同步整流方案,即一种新的单绕组自驱动同步整流方案,通过此方案来解决常规的自驱动同步整流方案所带有的种种局限性。单绕组自驱动同步整流方案就是本文主要说明的方案,它具有简单性、经济性、可靠性,单绕组自驱动同步整流这种整流方案在低功率,输出低压,大电流的DC/DC变换器应用场合中使用十分合适。自驱动同步整流的应用拓扑范围很宽,尤其适用于变压器如桥式、推挽等对称工作的拓扑。本毕设将会进行研究分析单绕组自驱动同步整流对称半桥变换器的优点,通过对主电路设计与驱动电路设计,具体到对电路元件参数进行相关计算和元件的选择,通过软件对其进行了仿真,验证了变换器低压,大电流输出的可行性。关键词:直-直;变换器;小功率;同步整流;单绕组自驱动;对称半桥;系统设计IILowvoltagehighcurrentsynchronousrectificationDC/DCconverterdesignAbstractInthe21stcentury,microelectronictechnology,Internettechnology,integratedcircuits,andinformationtechnologydevelopedveryquickly.Integratedcircuitchipsanddigitalsignalprocessorsscaleisuniversalapplicationinmobilephones,laptops,workstations,andsoonoccasion.Low-powerDC/DCconverterinthecomputer,communicationsandotherapplicationshavebeenwidelyused.Itspowersupplymusthavealoweroutputvoltage,outputcurrent,higherpowerdensity,higherefficiency,stability,andhasfastdynamicresponsetomeettherequirementsofvariousoccasionsoverthefaster,moreefficientdataprocessingspeed.AccordingtoDClowvoltagehighcurrentoutputDC/DCconverterfeatures,weknowthattheconverterefficiencyisanimportantmanifestationoftheanalysisoftheprinciplesandcharacteristicsofsynchronousrectification,andhighlightsthelow-powerapplicationsineachself-drivensynchronousrectificationDominant,forself-drivensynchronousrectification,theanalysisdescribesthevariouscombinationofcircuittopologywithafter,wefounditnecessarytogiveanewsynchronousrectificationscheme,namely,anewsingle-windingself-drivensynchronousrectificationscheme,throughthisprogramstoaddresstheconventionalself-drivensynchronousrectificationprogrambroughtsomevariouslimitations.Single-windingself-drivensynchronousrectificationschemeismainlydescribedhereinprograms,ithasasimple,economical,reliable,itisverysuitableforlow-powerlowvoltagehighcurrentoutputDC/DCconverterapplicationsoccasions.Self-drivensynchronousrectificationtopologyofawiderangeofapplications,especiallyfortransformersuchastopologybridge,push-pullandothersymmetricalwork.Thisarticlewillstudyandanalyzesingle-windingself-drivensynchronousrectificationsymmetricalhalf-bridgeconvertercharacteristicsbydrivingthemaincircuitdesignandcircuitdesign,circuitelementsspecifictotherightIIIrightparametersrelatedcalculationsandcomponentselection,throughitssoftwaresimulation,verificationofthelow-voltage,high-currentoutputoftheconverterfeasibility.Keywords:DC-DC;Converter;LowPower;Synchronous;RectificationSelf-Driven;Half-BridgeSystem;DesignIV目录1绪论......................................................................11.1课题背景............................................................11.2电源管理概述和发展趋势..............................................21.3开关电源叙述........................................................21.3.1直流开关电源分类...............................................21.3.2开关电源的定义.................................................31.3.3开关电源的工作原理.............................................31.3.4开关电源的组成.................................................41.4本文主要研究的内容..................................................52同步整流原理及同步整流方案的选择..........................................62.1同步整流的原理......................................................62.1.1同步整流对效率的影响...........................................62.1.2同步整流的由来.................................................72.1.3同步整流管的简介与选择.........................................82.1.4典型的同步整流电路及其工作过程.................................82.1.5同步整流对驱动信号的要求.......................................92.1.6同步整流管与结型整流二极管的损耗分析..........................102.2同步整流的方案选择.................................................112.3单绕组自驱动同步整流方案的拓扑分析.................................122.3.1关于对称半桥变换器SWSDSR原理剖析.............................122.3.2单绕组自驱动同步整流的分析总结................................132.4本章小结............................................................133单绕组自驱动同步整流对称半桥变换器的设计与仿真...........................153.1主要电路参数设计...................................................153.1.1主电路参数设计................................................153.1.2控制电路的参数设计............................................173.2仿真结果...........................................................193.3仿真结果分析.......................................................224总结展望.................................................................244.1本文小结...........................................................244.2开关电源的研究前景与展望...........................................24致谢.......................................................................25参考文献...................................................................2611绪论本文针对最新一代数据处理器、仪器仪表、网络产品相关的工控设备、通讯产品设备、电力相关设备、影音设备等等的应用场合,对各种产品的电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