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I基于DC-DC转换移动电源的研究与设计摘要：目前人们生活水平的不断提高，随身携带式的电子产品也越来越多为了解决续航问题需要一种移动电源。因此本文设计了一款基于DC-DC升压型移动开关电源的电路，该电路采用聚合物电池电源管理方案实现，能满足5V移动设备的续航要求。电路中主要由单片机SN8P2711来控制锂电池充电模块的工作与休眠，实现锂电池电量的显示以及电源输出的开关，同时也控制DC-DC升压电路的工作与否。该设计主要是实现聚合物电池的充电以及放电。设计的主要理念是实现电能的高效率转换。该移动开关电源具有输出电压纹波小，转换效率高，最高转换效率达到89%，具有良好的性能和负载调整能力。关键词：DC-DC转换；开关电源；SN8P2711；移动电源；IIResearchanddesignofDC-DCconversitonmobilepowerAbstract:Atpresentpeople'slivingstandardscontinuetoimprove,carryportableelectronicproductsisalsoincreasing，soamobilepowerisneededtosolvetheenduranceproblem.ThispaperdesignsacircuitbasedonDC-DCboostmobileswitchingpower,usingpolymerbatterypowermanagementprogram,itcanpower5Vmobiledevices.Inthiscircuitcharging,displayofthelithiumbatteryandpoweroutputaremainlycontrolledbythemicrocontrollerSN8P2711lithium,meanwhileitcontroltheworkofDC-DCboostcircuit.Thedesignofthemainpolymerbatteryenergystorageanddischarge.Themaindesignphilosophyistoachievehigh-efficiencyconversionofelectricalenergy.Themobileswitchingpowersupplyoutputvoltageripple,highconversionefficiency,thehighestconversionefficiencyof89%,withgoodperformanceandloadregulationcapability.Keywords:DC-DCconverter;switchingpowersupply;SN8P2711;mobilepower;III目录1概述...........................................................11.1DC-DC移动电源简介......................................................................................................11.2DC-DC移动电源的发展与趋势......................................................................................11.3本文研究的意义.............................................................................................................32移动电源基础...................................................42.1移动电源的定义.............................................................................................................42.2移动电源的适用范围.....................................................................................................42.3移动电源的技术.............................................................................................................52.4移动电源工作原理.........................................................................................................52.5电源电芯.........................................................................................................................52.6升压系统.........................................................................................................................62.7充电管理系统.................................................................................................................62.8移动电源的基本构成.....................................................................................................63移动电源硬件设计方案...........................................73.1移动电源系统框架结构.................................................................................................73.2硬件设计框图.................................................................................................................73.3锂电池充电电路.............................................................................................................83.3.1AP5056电路工作过程........................................................................................93.3.2芯片热保护功能...............................................................................................103.4DC-DC升压电路设计....................................................................................................113.4.1外围器件的选择...............................................................................................113.5聚合物电池保护电路设计...........................................................................................133.6电阻分压采样电路.......................................................................................................143.7单片机控制电路设计...................................................................................................143.7.1单片机SN8P2711A简介.................................................................................143.7.2单片机引脚图及功能.......................................................................................153.7.3单片机控制电路...............................................................................................163.8负反馈控制PWM实现稳压功能电路...........................................................................194系统软件设计方案..............................................204.1程序设计步骤...............................................................................................................204.2程序设计流程图...........................................................................................................204.3单片机软件控制工作说明...........................................................................................215总结..........................................................22[参考文献].......................................................23附录...........................................................2411概述1.1DC-DC移动电源简介DC-DC移动电源转换系统是利用电能转换技术将电池或其他直流电源等一次电能转换成适合各种用电对象的二次电能供应的装置，是电子工业的基础产品，一切便携式电子设备的动力心脏。DC-DC电源转换系统的性能直接影响到整个电子系统的安全性和可靠性指标。随着电力电子技术的高速发展，电力电子设备与人们工作和生活的关系变得日益密切。同时，电子产品正向多元化发展，对电