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本科毕业设计（论文）基于MAX1898的锂电池快速充电器设计学院信息工程学院专业年级班别学号学生姓名指导教师年月摘要在我们的日常生活中,手机已经变得越来越重要了。我们经常需要使用手机，打电话、发短信、上网、看电影、听歌、玩游戏等等。随着大屏幕和高主频的手机出现，锂离子电池就变得更加重要了，其锂离子电池充电器也受到广大消费者的重视。该课题主要是设计一种基于单片机的锂离子电池充电器，在设计上，通过AT89C51和MAX1898可以控制实现预充，快速充电，及恒压充电。该设计可以监控充电过程中的各个状态，实现电路简单，成本较低，而且充电效果很好，包括安全性高，耗时短，对电池损坏小，满足一般用户的要求。本文还对充电器的核心器件MAX1898充电芯片、AT89C2051单片机进行了较详细的介绍。该智能充电器具有检测锂离子电池的状态；自动切换充电模式以满足充电电池的充电需要；充电状态显示的功能。通过光耦6N137可以实现定时切断MAX1898的电源，减少能耗，同时也延长了它的使用寿命。关键词:锂电池，充电器，单片机，AT89C51,MAX1898AbstractInourdailylives,mobilephoneshavebecomeincreasinglyimportant.Weoftenneedtousethephone,makingphonecalls,textmessaging,Internet,watchingmovies,listeningtomusic,playgamesandsoon.Withtheadventoflargescreenandhigh-frequencymobilephone,thelithium-ionbatteriesbecomemoreimportant,itslithium-ionbatterychargerbytheconsumersattention.Themaintopicistodesignamicrocontrolunitbasedlithium-ionbatterychargerdesignedtoAT89C51andMAX1898canbecontrolledtoachievethepre-charge,fastchargeandconstantvoltagecharging.Thedesigncanmonitorthechargingprocessineachstate,thecircuitissimple,lowcost,andchargeagoodeffect,includingthesafe,timeconsumingshort,small,batterydamageandtomeettherequirementsofgeneralusers.ThearticlealsohasamoredetailedintroductiontothecoreofthedeviceMAX1898chargerchargingchip,AT89C2051microcontrolunit.Thesmartchargerhasastateofthedetectionoflithium-ionbattery;automaticallyswitchtochargingmodetomeetthechargeoftherechargeablebattery;chargingstatusdisplayfunction.throughthe6N137canbeachievedfromtimetotimetocutofftheMAX1898powersupply,reducingenergyconsumption,butalsoextenditsservicelife.Keywords:Lithiumbattery,Charger,SCM,AT89C51,MAX1898目录1绪论......................................................................................................................................11.1课题研究的背景..........................................................................................................11.1.1二次电池的性能比较....................................................................................21.1.2镍氢电池、镍镉电池与锂离子电池之间的差异........................................21.2课题研究的意义..........................................................................................................31.3课题研究的主要工作..................................................................................................32电池的充电方法与充电控制技术......................................................................................52.1电池的充电方法和充电器..........................................................................................52.1.1电池的充电方法............................................................................................52.1.2充电器的要求和结构....................................................................................92.1.3单片机控制的充电器的优点......................................................................102.2充电控制技术............................................................................................................112.2.1快速充电器介绍..........................................................................................112.2.2快速充电终止控制方法..............................................................................123锂电池充电器电路设计....................................................................................................153.1系统整体框架............................................................................................................153.2单片机STC89C52.....................................................................................................153.3电源产生芯片LM7805.............................................................................................163.4充电管理芯片MAX1898..........................................................................................173.4.1芯片功能介绍..............................................................................................173.4.2引脚功能介绍..............................................................................................173.4.3详细描述......................................................................................................183.4.4应用电路......................................................................................................213.4.5充电过程解析..............................................................................................213.5外部晶体管的选择....................................................................................................223.6光电耦合器6N137....................................................................................................234锂电池充电器软件设计....................................................................................................254.1程序功能....................................................................................................................254.2程序流程图................................................................................................................255总结与展望........................................................................................................................28参考文献.............................................................................