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毕业设计说明书开关电源并联供电系统开关电源并联供电系统摘要：伴随着电力电子技术近年来迅猛的发展，各个产业对于电子装置的需求量都在日益增加。同时因为各种电子装置都在不断地更新换代，往多元化以及集成化的方向发展，其对电源功率、电流的要求也在不断提高。但是由于受到构成电源的各个模块中所包含的器件、材料等的影响，单个开关电源模块在功率、电流、电压等各个方面都往往无法满足电子装置的要求，更何况因为近年来新能源的发展，光伏产业发展也十分迅速，单个电源完全无法满足使用的需求。因此，开关电源并联供电系统就随之而产生了。本系统由恒流源模块、恒压源模块、单片机系统控制模块、辅助电源模块与显示模块五部分组成。在电源模块上本系统使用的是LM2596模块，并且依靠它来实现降压，同时采用了STC12C5A60S2单片机作为控制核心，配合使用IN282作为放大器进行50倍放大来采集信号。在比较器上，选择的是LM358,并且使用主从均流法来对采集的两路信号，通过软件算法来实现分配误差，以此来对电源模块的电流进行自动调整。在本系统中，使用的是LCD1602显示屏来呈现采集的数据。最后，在系统中设置了过流保护电路，一旦负载的电流超过了设定的值，将会自动启动中断，并在一段时间后恢复。经过测试，本设计已经完成了设计任务的要求，实现了两模块电流的分配。关键词：开关电源，并联供电，单片机SwitchingPowerSupplyParallelPowerSupplySystemAbstract：Alongwiththerapiddevelopmentofpowerelectronicstechnologyinrecentyears,thedemandforelectronicdevicesinvariousindustriesisincreasing.Atthesametime,becauseallkindsofelectronicdevicesareconstantlyupgrading,toadiversifiedandintegrateddirection,thepowerofthepowersupply,thecurrentrequirementsarealsoconstantlyimproving.Butduetothepowerofeachmodulecontainsdevicesandmaterialsinfluence,asingleswitchingpowersupplymoduleinallaspectsofpower,current,voltage,etc.areoftenunabletosatisfyrequirementsoftheelectronicdevice,nottomentionbecauseinrecentyearsthedevelopmentofnewenergy,photovoltaicindustrydevelopmentisveryrapid,singlepowersupplycompletelyunabletomeetdemand.Therefore,theparallelpowersupplysystemofswitchingpowersupplyisproduced.Thesystemiscomposedoffiveparts,whichareconstantcurrentsourcemodule,constantpressuresourcemodule,singlechipmicrocomputersystemcontrolmodule,auxiliarypowermoduleanddisplaymodule.Thesystemusedinthepowersupplymoduleislm2596module,andrelyonittorealizebuck,alsousesSTC12C5A60S2microcontrollerasthecontrolcore,withtheuseofIN282asanamplifierfor50timesamplificationsignalacquisition.Inthecomparator,thechoiceisLM358,andtheuseoftheslaveflowmethodtocollectthetwosignals,throughthesoftwarealgorithmtoachievedistributionerrors,inordertoautomaticallyadjustthecurrentpowermodule.Inthissystem,theuseofLCD1602displaytoshowthedatacollected.Finally,anovercurrentprotectioncircuitissetupinthesystem.Oncethecurrentoftheloadexceedsthesetvalue,itwillautomaticallystarttheinterruptandresumeafteraperiodoftime.Aftertesting,thedesignhascompletedtherequirementsofthedesigntask,therealizationofthedistributionofthetwomodulecurrent.Keywords:switchingpowersupply,parallelpowersupply,singlechipmicrocomputer中北大学2016届毕业设计说明书第I页共II页目录1绪论........................................................................................................................................................11.1选题的目的及意义.........................................................................................................................11.2国内外研究现状.............................................................................................................................21.2.1国内外现状简介.........................................................................................................................21.2.2改进的常用均流控制法...........................................................................................................31.2.3新型的均流控制法....................................................................................................................31.3分布式电源系统的发展...............................................................................................................51.4设计任务...........................................................................................................................................62整体方案设计......................................................................................................................................72.1设计思路...........................................................................................................................................72.2方案选择...........................................................................................................................................82.2.1恒压源与恒流源模块的设计方案选择................................................................................82.2.2分流方案选择.............................................................................................................................82.2.3过流保护方案选择....................................................................................................................92.2.4辅助电源电路方案的选择....................................................................................................103硬件电路设计.....................................................................................................................................113.1恒压源与恒流源模块的设计.....................................................................................................113.1.1恒流源模块.................................................................................................................................113.1.2恒压源模块................................................................................................................................133.2单片机系统控制模块的设计...........................................................................