单管正激式开关稳压电源的设计-吴位信VIP免费

本科学生毕业论文单管正激式开关稳压电源的设计系部名称：电气与信息工程学院专业班级：电气11-1班学生姓名：吴位信指导教师：葛洪军职称：副教授黑龙江工程学院二○一五年六月TheGraduationThesisforBachelor'sDegreeDesignofthesinglepipeisshocktypeswitchregulatedpowersupplyCandidate：WuWieixinSpecialty：ConstructionMachineryClass：11-1Supervisor：AssociateProf.GeHongjunHeilongjiangInstituteofTechnology2015-06·Harbin黑龙江工程学院本科生毕业设计摘要开关稳压电源有多种类型，其中正激式开关电源因其电路简单可靠，抗过载能力强，所需要的元器件较少，容易集成，不易饱和且能够提供多路隔离输出等优点而被广泛应用于中、小功率电源领域。为了保证电路的稳定可靠，本次设计采用的是隔离型电路其中以单端正激型变换器作为主电路，其主要由高频变压器与开关管构成，主要功能是处理电能。本文分析了PWM脉宽调制芯片UC3844构成开关电源的整体结构电路，并以UC3844作为主芯片控制功率MOS管P60NF06的导通与截止，而UC3844的启动电压由三端稳压器LM7818输出提供，采样反馈电路以TL431和光电耦合器PC817为核心，而输入滤波电路和输出整流滤波电路主要由电容构成，且对输入干扰和输出纹波电压有了很好的消除作用，使系统更加的稳定可靠，从而完成了单管正激式开关电源的设计。关键词：开关电源，正激型变换器，PMW，UC3844黑龙江工程学院本科生毕业设计ABSTRACTWiththerapiddevelopmentofpowerelectronictechnology,theapplicationofswitchingpowersupplyisalsomoreandmorewidely.Therearedifferenttypesofswitchingpowersupply,whichistheIPswitchpowersupplybecauseofitscircuitissimple,reliable,strongoverloadcapacity,therequiredcomponentsless,easeofintegration,noteasilysaturatedandcanoffertheadvantagesofmultipleoutputisolationandwidelyappliedinthemediumandsmallpowersources.Thisdesignisgivenprioritytowithsinglecorrecttypeexcitationconvertercircuit,mainlyconsistsofhighfrequencytransformerandswitchtube,itsmainfunctionistodealwithelectricity.ThispaperanalyzesthePWMpulsewidthmodulationchipUC3844constituteintegralcircuitstructureandworkingprincipleofswitchpowersupply,andbyUC3844asthemaincontrolchipcontrolswitchtubeP60NF06conductionanddeadline,samplingfeedbackcircuitTL431andphotoelectriccouplerPC817asthecore,andtheinputfiltercircuitandoutputrectifierfiltercircuitismainlycomposedofcapacitor,andtheinputandoutputripplevoltagehastheverygoodeliminationeffect,makethesystemmorestableandreliable,thuscompletethesinglepipeisshocktypeswitchingpowersupplydesign.Keywords:Switchingpowersupply；Normalshocktypeconverter；PWM；UC3844黑龙江工程学院本科生毕业设计目录摘要........................................................ⅠAbstract......................................................Ⅱ第一章引言.................................................11.1开关电源的国内外发展概况.........................................11.2课题研究的目的和意义.............................................11.3课题研究的主要内容................................................2第二章正激式开关电源总体方案的设计...........................32.1开关电源变换电路的选择............................................32.2控制电路的选择...................................................32.2.1单片机控制电路..............................................32.2.2芯片控制电路................................................42.3正激式开关电源的电路结构图........................................42.4本章小结..........................................................4第三章单管正激式开关电源的设计...............................53.1正激式开关电源的工作原理........