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1、黄河科技学院毕业设计说明书第19页高效率开关稳压电源的设计摘要近年来随着我国微处理机和电视机的发展，开关电源以其效率高、体积小、重量轻等优势在很多方面逐步取代了效率低、又笨又重的线性电源。开关电源广泛应用在家电，商业，工矿等场合，是电子技术推动国民经济发展的一大体现。随着半导体技术的高度发展集成开关稳压电源也迅速发展。目前已形成了各种功能完善集成控制器系列使得开关稳压电源更具用武之地。本文介绍了一种采用单端反激式结构的高效稳压电源的设计方案。它采用美国德州仪器的UC3842PWM控制芯片，该芯片是专为小功率单端反激式开关稳压电源设计的集成电流调宽式控制器，具有各种类型的保护电路，节能
2、性好，引脚少，工作频率高等优点。采用UC3842设计出的开关稳压电源具有效率高，稳定性好，对电网电压波动不敏感，设计时所需外围元件少，电路保护功能较完善，应用性强等优点。设计过程中尽量考虑了各种电磁干扰问题力求完善电路结构。关键词：开关管，整流滤波，高效，高频变压器，控制器黄河科技学院毕业设计说明书第19页High-efficiencyswitchingpowersupplydesignAuthor:QiupengTutor:CaiyanyanAbstractInrecentyears，withChina'smicroprocessorandthedevelopmentofTV,sw
3、itchingpowersupplywithitshighefficiency,smallsize,lightweightadvantagesinmanyaspects,graduallyreplacinglinearpowerwithlow-efficiency,highweight.Switchingpowersupplyiswidelyusedinhomeappliances,commercial,industrialandsoon,itistopromotenationaleconomicdevelopmentofelectronictechnologyofamajoremb
4、odiment.Withthehighlydevelopmentofsemiconductortechnology,integratedswitchingpowersupplyisalsogrowingrapidly.Atpresent,theintegratedcontrollerserieswhichhaveavarietyofperfectfunctionsismakingtheswitchingpowersupplymoreusefull.Inthisabstract,itintroducesahighlyefficientpowersupplydesignwhichuses
5、asingle-endedflybackstructure.ItusesUC3842PWMcontrolchipoftheU.S.TexasInstruments,thechipisusedfortheintegratedcurrent-width-modulatedcontrollerwhichisdesignedbylow-powersingle-endedflybackswitchingpowersupply,ithasvarioustypesofprotectioncircuits,energy-saving,good-pinsmall,highfrequency.Switc
6、hingpowersupplywhichisdesignedbyUC3842hasavarietyofadvantagessuchashighefficiency,goodstabilityandfluctuationofvoltage,unsensitive,thelessexternalcomponentstheperfectprotectioncircuit,strongapplicationsandsoon.Avarietyofelectromagneticinterferenceproblemsareconsidedinthedesignprocess,tomakethec
7、ircuitstructureperfectfully.Keywords:filter,switch,efficienthigh-frequencytransformerrectifier,controller黄河科技学院毕业设计说明书第19页目录1绪论11.1课题背景及目的11.2方案选择22电路原理42.1基本原理42.2单端反激式开关电源结构52.2.1控制器62.2.2整流滤波92.2.3软启动电路92.2.4变换器92.2.5反馈电路102.2.
