毕业论文-开关电源设计

兰州交通大学毕业设计（论文）I摘要开关电源因其具有稳压输入范围宽、效率高、功耗低、体积小、重量轻等显著特点而得到了越来越广泛的应用，从家用电器设备到通信设施、数据处理设备、交通设施、仪器仪表以及工业设备等都有较多应用，尤其是作为便携式产品的电池提供高性能电源输出，比其他结构具有不可超越的优势。开关电源的稳定性直接影响着电子产品的工作性能,误差放大器是直流开关电源系统中电压控制环路的核心部分，其性能优劣直接影响着整个直流开关电源系统的稳定性，因而对高性能误差放大器的分析是本论文的主要研究目标。本文误差放大器的分析基于Buck型DC-DC转换器，从系统稳定性、负载调整率及响应速度要求的角度出发，首先对该款Buck型DC-DC转换器的系统电压控制环路进行小信号分析,并对控制环路进行了零极点分布分析，确定环路补偿策略。最后基于系统级来分析误差放大器。关键词：开关电源；Buck型DC-DC转换器；误差放大器。兰州交通大学毕业设计（论文）IIAbstractDuetotheirmeritsofwideinputrange,highefficiency,smallinsizeandlightinweightect,switchingpowersuppliesaregainingmoreandmoreapplicationareasintoday’smodernworld,rangingfromdomesticequipmentstosophisticatedcommunicationanddatahandlingsystems,especiallyinportabledevices,theyhaveunsurpassableadvantages.Therapiddevelopmentofproductsincorrespondingapplicationareasrequiresthepowersuppliestohavebetterperformances.Therobustnessofswitch—modepowersuppliesdirectlyaffecttheperformanceofelectronicdevices.AsoneofthemostimportantpartsofswitchedmodeDCtoDCconverters,erroramplifierhassignificantinfluencesonthevoltagecontrolloop’sstability.ThusthispaperfocusesonthedesignofhighperformanceerroramplifierforDC-DCconvertersbasedonsystemrequirementsanalysis.AbuckDC-DCconverterwasconcerned,anerroramplifierforthebuckconverterwasdesignedfromthepointsofviewofsystemstability,loadregulationandresponsespeedrequirements.Atthefirstplace,theBuckDC-DCconverter’svoltagecontrolloopstabilityandpole-zeroanalysiswasdonebasedonasmallsignalmodelofthevoltagecontrolloop,thecompensationschemewasproposed.Atlast,accordingtothesystemleveltoanalysistheerroramplifier.Keywords：Switchingpower;BuckDC-DCConverter;ErrorAmplifier.兰州交通大学毕业设计（论文）1目录摘要...........................................................................................................................................IAbstract......................................................................................................................................II1.诸论...................................................................................................................................11.1引言.............................................................................................................................11.2本文研究的目的与意义.............................................................................................11.3本论文主要研究内容.................................................................................................12.开关电源基础及其类型.....................................................................................................22.1开关电源基础理论.....................................................................................................22.1.1开关电源基本工作原理.......................................................................................22.1.2开关电源的组成...................................................................................................22.1.3开关电源的各种分类...........................................................................................32.2开关电源典型结构[6]..................................................................................................42.3DC-DC变换器............................................................................................................72.3.1Buck变换器...........................................................................................................83.3.2Boost变换器........................................................................................................103.Buck型DC-DC转换器及其控制方式分析...................................................................123.1Buck型DC-DC转换器...........................................................................................123.2Buck型DC-DC转换器及其控制方式...................................................................133.2.1Buck型DC-DC转换器工作原理......................................................................133.2.2Buck型DC-DC转换器的控制方式..................................................................143.2.3Buck型DC-DC转换器工作模式......................................................................183.3环路控制中误差放大器的重要作用.......................................................................184.开关电源管理电路系统分析...........................................................................................194.1Buck型DC-DC转换器...........................................................................................194.2开关电源控制环路的分析研究...............................................................................204.2.1Buck型DC-DC转换器稳定性分析..................................................................204.2.2Buck型转换器电压环路控制模型.....................................................................215.误差放大频率特性及其补偿策略...................................................................................275.1控制电路的频率响应分析.......................................................................................27兰州交通大学毕业设计（论文）25.1.1频率响应.............................................................................................................275.1.2开关电源输出滤波电路分析...........................................................