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毕业论文（设计）题目：基于LM2596可调开关电源的设计与制作（Title）：BasedontheLM2596adjustableswitchingpowersupplydesignandmanufacture系别：________电气工程系_________专业：＿＿电气工程及其自动化＿＿姓名：＿＿＿＿林渊豪＿＿＿＿＿＿学号：2____2011010143324_________指导教师：＿＿＿＿＿汪蔚＿＿＿＿＿__日期：＿＿＿2015年5月__________3基于LM2596可调开关电源的设计与制作摘要近年来，随着功率电子器件(如IGBT、MOSFET)快速发展、PWM技术以及电源理论深入发掘，新一代的电源开始逐步取代传统的电源电路。并且现代电子技术的发展高速化，电子系统的应用领域越广泛化，电子设备的种类多样化，电子设备与人们的工作、生活的关系日益密切。电子设备的低功耗需求越来越来强烈。开关电源中的功率调整管工作在开关状态，具有功耗小、效率高、稳压范围宽、温升低、体积小等突出优点，在通信设备、数控装置、仪器仪表、视频音响、家用电器等电子电路中得到广泛应用。开关电源是利用现代电力电子技术，控制开关晶体管开通和关断的时间比率，维持稳定输出电压的一种电源。随着电力电子技术的发展和创新，使得开关电源技术在不断地创新，这一成本反转点日益向低输出电力端移动，这为开关电源提供了广泛的发展空间。本论文设计了一款降压型DC/DC开关电源电路，分析和阐述了降压型转换器的电路拓扑和工作原理，根据系统性能设计了电路，该电源具有1.5V-37V的电源电压输入范围，输出电压在1.25V-35V之间连续可调，经功率计测量、计算得电源转换效率达到85%以上，各项指标均达到了设计要求。电源整体电路满足小封装要求，可应用在MCU、DSP以及USB电源等便携式电子产品中关键词：直流稳压电源；整流；滤波；LM25964AbstractWiththerapiddevelopmentofelectronictechnology,theapplicationfieldofelectronicsystemismoreandmorewidely,thekindsofelectronicequipmentmoreandmore,therelationshipbetweenelectronicequipmentandpeople'sworkandlifeisbecomingmoreandmoreclosely.Inrecentyears,withthepowerelectronicdevices(suchasIGBT,MOSFET),PWMtechnologydevelopmentandpowertheory,anewgenerationofpowersupplybegantograduallyreplacethetraditionalpowersupplycircuit.Switchpowersupplyofpoweradjustingpipeworkontheswitchstate，withlowconsumption,highefficiency,widevoltagerange,lowtemperature,smallsizeandotheroutstandingadvantages,incommunicationsequipment,numericalcontrolequipment，instrumentation,audio,homeappliances,andotherwidelyusedinelectroniccircuits.Switchingpowersupplyistheuseofmodernpowerelectronictechnology,controlswitchtransistoropenedandshutofftimeratio,tomaintainstableoutputvoltageofapowersupply.Withthedevelopmentofpowerelectronictechnologyandinnovationtomakeswitchingpowersupplytechnologyinconstantinnovation,thecostofreversalpointsincreasinglymovetolowoutputpowerend,fortheswitchingpowersupplyprovidesabroadspacefordevelopment.Thispaperdesignedastep-downDC/DCswitchingpowersupplycircuit,typeanalysisandexpoundsthestep-downconvertercircuittopologyandtheworkingprinciple,accordingtotheperformanceofthesystemdesignofthecircuit,thepowersupplyis1.5V-40Vinput5voltagerange,outputvoltageadjustablebetween1.25V-35V,thepowermetermeasuring,computingpowerconversionefficiencyof85%ormore,theindicatorshavereachedthedesignrequirements.Overallpowersupplycircuitmeettherequirementofsmallpackage,andcanbeusedinportableelectronicproductssuchasMCU,DSPandUSBpowersupply.Designrequirementsforthemaximumoutputvoltageof37V,sothedesignwillleadtoagridrectifierfiltercircuitdropthroughthelm317intoLM2596inputvoltage.keywords：Dcregulatedpowersupply;Rectification;Filtering;LM25966目录1引言......................................................................................................................................................12设计方案比较论证.............................................................................................................................22.1线性电源......................................................................................................................................22.2开关电源......................................................................................................................................23系统原理及各单元模块.....................................................................................................................43.1系统设计框图..............................................................................................................................43.2各单元电路的设计.....................................................................................................................53.2.1变压器降压...........................................................................................................................53.2.2桥式整流电路.......................................................................................................................63.2.3滤波电路...............................................................................................................................73.2.4LM2596降压电路稳压........................................................................................................104系统原理图及PCB设计...................................................................................................................184.1系统电路原理图.........................................................................................................................184.1.1LM2596输入电压原理图....................................................................................................184.1.2LM2596降压开关电源原理图............................................................................................184.1.3电路PCB设计....................................................................................................................195系统性能指标测试...........................................................................................................................205.1系统实物图................................................................................................