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1青岛农业大学毕业论文（设计）题目：多路输出开关电源设计姓名：学院：专业：班级：学号：指导教师：年月日2毕业论文（设计）诚信声明本人声明：所呈交的毕业论文（设计）是在导师指导下进行的研究工作及取得的研究成果，论文中引用他人的文献、数据、图表、资料均已作明确标注，论文中的结论和成果为本人独立完成，真实可靠，不包含他人成果及已获得青岛农业大学或其他教育机构的学位或证书使用过的材料。与我一同工作的同志对本研究所做的任何贡献均已在论文中作了明确的说明并表示了谢意。论文（设计）作者签名：日期：年月日毕业论文（设计）版权使用授权书本毕业论文（设计）作者同意学校保留并向国家有关部门或机构送交论文（设计）的复印件和电子版，允许论文（设计）被查阅和借阅。本人授权青岛农业大学可以将本毕业论文（设计）全部或部分内容编入有关数据库进行检索，可以采用影印、缩印或扫描等复制手段保存和汇编本毕业论文（设计）。本人离校后发表或使用该毕业论文（设计）或与该论文（设计）直接相关的学术论文或成果时，单位署名为青岛农业大学。论文（设计）作者签名：日期：年月日指导教师签名：日期：年月日3目录摘要..............................................................................................................................................IAbstract..........................................................................................................................................II1绪论.............................................................................................................................................11.1课题背景及意义...............................................................................................................11.2开关电源简介...................................................................................................................11.3开关电源的发展历史和发展前景...................................................................................22开关电源的工作原理及分类.....................................................................................................42.1开关电源的工作原理.......................................................................................................42.2开关电源的设计指标.......................................................................................................52.3开关电源的调节方式.......................................................................................................52.4开关电源分类...................................................................................................................63电路主要元器件选择...............................................................................................................143.1单片开关电源芯片的选取.............................................................................................143.2变压器.............................................................................................................................184开关电源电路设计...................................................................................................................214.1EMI滤波器设计.............................................................................................................214.2开关电源的高频变压器设计.........................................................................................224.3保护电路和输入端整流电路设计.................................................................................254.4反馈电路设计.................................................................................................................274.5次级输出滤波电路和稳压电路设计.............................................................................294.6输出端稳压电路设计.....................................................................................................315总结...........................................................................................................................................345.1全文总结.........................................................................................................................345.2工作展望.........................................................................................................................34参考文献.......................................................................................................................................35致谢...............................................................................................................................................37附录.................................................................................................................错误!未定义书签。I多路输出开关电源设计摘要在深入分析开关电源工作原理和特点的基础上，根据设计指标的要求完成了一款单端反激式两路输出开关电源的设计。本文首先介绍了开关电源的发展历程及其工作原理，分析了开关电源的几种调节模式和几种工作电路；进而通过分析选定电路需要的元器件，包括TOP223P、TL431三端可调分流基准电压源、LM2575系列开关稳压集成电路和几种不同类型的二极管；最后设计出完整的总电路。主要电路包括输入电磁干扰滤波器（EMI）、整流滤波电路、功率变换电路、PWM控制器电路、输出整流滤波电路组成。该电源具有宽电压输入，多路稳定输出、纹波和噪声可控制等优点。在完成电路的研究和焊接后通过不断的改进与完善，最终得到的结果基本符合预期，效果比较理想。关键词：开关电源；多路输出；TOP223P；脉宽调制；反激式IITheDesignofMultiple-OutputSwitchingPowerSupplyAbstractBasedontheanalysisoftheworkingprincipleandcharacteristicsofswitchingpowersupply,thedesignofasingleendedflybacktwo-wayoutputswitchingpowersupplyisaccomplishedaccordingtothedesignrequirements.Inthispaper,wefirstintroducethedevelopmentofswitchingpowersupplyanditsworkingprinciple,analysisoftheswitchingpowersupplyofseveralregulatorymodeandseveralworkingcircuit;then,throughtheanalysisofselectedcircuitsrequirecomponents,includingtop223pTL431,threeterminaladjustableshuntreferencevoltagesource,theLM2575seriesswitchingregulatorICandseveraldifferenttypesofdiodes.Finally,wehavedesignedintegratedcircuit.Themaincircuitsincludetheinputelectromagneticinterferencefilter(EMI),therectifierfiltercircuit,thepowerconverter,thePWMcontrollerandtheoutputrectifierfiltercircuit.Th