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密级：NANCHANGUNIVERSITYGONGQINGCOLLEGE学士学位论文（设计）THESISOFBACHELOR（2011—2015年）二○一五年六月中文题目:20V输出DC-DC开关电源的设计与制作英文题目：20voutputDC-DCswitchingpowersupplydesignandproduction学院：南昌大学共青学院系别：电子信息工程系专业班级：11级电子信息工程本科1班学生姓名：学号：指导教师：南昌大学共青学院毕业设计（论文）原创性声明学士学位论文原创性声明本人郑重声明：所呈交的论文是本人在导师的指导下独立进行研究所取得的研究成果。除了文中特别加以标注引用的内容外，本论文不包含任何其他个人或集体已经发表或撰写的成果作品。对本文的研究做出重要贡献的个人和集体，均已在文中以明确方式标明。本人完全意识到本声明的法律后果由本人承担。本人签名：日期：南昌大学共青学院毕业设计（论文）摘要I摘要近些年来，快速发展起来的开关电源技术，其中DC-DC开关电源已经在广泛应用在计算机、通讯以及便携式电子产品等领域。因为高效节能的DC-DC开关电源所能带来的巨大经济效益，从而发展推广的特别的迅速。而这些年电力电子技术的不断发展，让开关电源技术也在不断的发展。本次论文是设计一款降压型DC-DC开关电源电路。首先本文详细的阐述了开关电源的原理和各种转换器的拓扑结果，其中着重解释了DC-DC降压的原理。然后根据性能要求设计电路的整体框图。对电路的各个部分进行设计和分析，包括整流滤波电路，BUCK降压电路，采样电路，驱动电路，显示电路。其中输入电压是24V，输出电压范围在0V-20V之间。关键词：开关电源；降压型；DC-DC转换；BUCK电路；南昌大学共青学院毕业设计（论文）AbstractIIAbstractInrecentyears,therapiddevelopmentofthetechnologyofswitchingpowersupply,theDC-DCswitchingpowersupplyhavebeenwidelyusedincomputer,communicationsandportableelectronicproductsetc..BecauseofhighefficiencyandenergysavingDC-DCswitchingpowersupplybringsenormouseconomicbenefits,sogetrapidpromotion.Theelectricpowerelectronictechnologydevelopment,sothattheswitchingpowersupplytechnologyisalsoinconstantdevelopment.OfthisthesisistodesignaDC-DCbuckswitchingpowersupplycircuit.Firstly,thispaperdiscussestheprincipleandtopologyofswitchingpowerconverter,whichfocusesontheinterpretationoftheprincipleoftheDC-DCbuck.Thenaccordingtotheoverallperformancerequirementsofthedesignofthecircuitdiagram.Thedesignandanalysisofeachpartofthecircuit,includingtherectifierfiltercircuit,BUCKcircuit,samplingcircuit,drivecircuit,displaycircuit.Theinputvoltageis24V,outputvoltageisintherangeof0V-20V.Keywords:switchingpowersupply;buckDC-DCconverter;BUCKcircuit;南昌大学共青学院毕业设计（论文）目录目录摘要.................................................................................................................错误!未定义书签。Abstract............................................错误!未定义书签。第一章引言.............................................................................................错误!未定义书签。1.1背景与意义................................................................................错误!未定义书签。1.2国内外开关电源研究现状....................................................................................11.2.1国外的研究现状.............................................................................................11.2.2国内的研究现状.............................................................................................2第二章开关电源的基本原理和拓扑结构............................92.1开关电源的工作原理..............................................................................................92.2开关电源的电路拓扑结构......................................................................................92.2.1Boost变换器......................................................................................................32.2.2Buck变换器.......................................................................................................42.2.3Buck-Boost变换器............................................................................................42.2.4Cuk变换器........................................................................................................52.3降压型DC/DC开关电源工作原理........................................................................5第三章设计方案和硬件选型...................................................................................83.1设计要求..................................................................................................................83.2整体设计方案..........................................................................................................83.3LM358.......................................................................................................................83.3.1LM358简介.......................................................................................................93.3.2LM258的引脚图...............................................................................................93.3.3LM358的内部原理图.....................................................................................103.4IR2103......................................................................................................................................103.4.1IR2103简介.....................................................................................................103.4.2IR2103功能框图.............................................................................................113.4.3IR2103引脚图.................................................................................................113.5STC12C5A60S2单片机介绍.................................................................................113.5.1STC12C5A60S2单片机简介..........................................................................113.5.2STC12C5A60S2单片机内部结构..................................................................133.5.3STC12C5A60S2单片机的AD转换器..........................................................14第四章系统电路设计.............................................................................................164.1整流滤波电路..........