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基于UCC28019的开关电源设计DesignofSwitchingPowerSupplyBasedonUCC28019专业：电子信息工程学号：05128025姓名：段闪指导老师：胡晗I基于UCC28019的开关电源设计摘要：电气设备的功率因数过低，会加重电网的负载，造成电网容量的浪费。功率因数的优劣是开关电源性能好坏的一个重要评价指标。为了便于研制和生产有源功率因数校正器，现在功率因数校正PFC（PowerFactorCorrection）的控制电路已集成化，有多种PFC集成控制电路芯片可供选择。本文采用TI公司生产的功率因数校正芯片UCC28019设计出一种高功率因数、高效率、低谐波的单相整流PFC开关电源。用两片高速串行AD转换器ADS7818对输出电压和电流采样,采样数据送单片机STC89C52处理并由液晶显示器SN1602实时显示当前输出电压、电流。系统具有2.5A过流保护。测试结果表明功率因数大于0.95，效率达到92%，输入电流波形谐波失真小于5%。关键词：开关电源；STC89C52；功率因数校正；UCC28019；过流保护IIDesignofSwitchingPowerSupplyBasedonUCC28019Abstract:Thepowerfactoroftheelectricalequipmentistoolow,whichwillincreasetheloadofthepowergridandresultinwastingofpowergridcapacity.Theadvantageordisadvantageofthepowerfactorsisanimportantevaluationindicatorforswitchingpowersupplyperformance.InordertodevelopandproducetheActivePowerFactorCorrection,thecontrolcircuitofPFC(PowerFactorCorrection)hasbeenintegratednow,sothereareavarietyofintegratedPFCcontrolcircuitchipstochoosefrom.Inthispaper,UCC28019PFCchipwhichisproducedbyTICompanyisusedtodesignakindofSingle-phasePFCrectifierswitchingpowersupplywithahighpowerfactor,highefficiency,lowharmonic.Withtwohigh-speedserialADconverterADS7818ofoutputvoltageandcurrentsampling,sampleprocessingdataissenttotheSTC89C52single-chipandLCDSN1602real-timedisplaysthecurrentoutputvoltageandcurrent.Thesystemhas2.5Aovercurrentprotection.Thetestresultsshowthatthepowerfactorismuchgreaterthan0.95,theefficiencyreachesto92%,Harmonicdistortionofinputcurrentwaveformislessthan5%.Keywords:switchingpowersupply;STC89C52;powerfactorcorrection;UCC28019;over-currentprotectionIII目录1绪论............................................................................................................................11.1引言..................................................................................................................11.2开关电源的发展历史......................................................................................11.3开关电源的基本结构......................................................................................21.4谐波电流对电网的危害...................................................................................32开关电源的功率因数................................................................................................42.1功率因数的定义..............................................................................................42.2功率因数校正技术..........................................................................................42.2.1功率因数校正的由来......................................................................................42.2.2功率因数校正的基本原理.............................................................................63基于UCC28019的开关电源设计及主要元器件参数计算...................................73.1系统方案设计与论证.......................................................................................73.1.1EMI滤波模块.....................................................................................................73.1.2整流模块..............................................................................................................83.1.3DC/DC变换模块...............................................................................................83.1.4A/D采样模块......................................................................................................83.1.5单片机模块..........................................................................................................93.1.6功率因数较正模块............................................................................................93.1.7显示模块..............................................................................................................93.1.8辅助电源模块...................................................................................................103.2系统的硬件设计总体方案............................................................................103.2.1Boost变换器.....................................................................................................113.2.2UCC28109芯片介绍......................................................................................123.2.3系统主要设计电路.........................................................................................153.2.4单片机系统及外围电路................................................................................193.2.5采样电路............................................................................................................203.2.6辅助电源...........................................................................................................213.2.7系统完整原理图..............................................................................................213.3系统软件设计方案........................................................................................213.3.1程序设计步骤.......................................................................................213.3.2程序设计流程图...................................................................................223.3.3程序清单............................................................................................................223.4系统调试..........