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1、第I页摘要直流电子设备的日常应用越来越多，一台直流电源往往由于功率、电压、电流等原因不能满足现场要求且易出故障，所以在生产应用中通常采用多个电源并联运行。并联均流技术是当前电力电子技术发展的重点，开关电源并联均流系统利用多个电源模块并联，通过改变并联模块的数量来满足不同功率的负载，每个模块能很好的满足电源在性能、重量、体积、效率、运输和可靠性等方面的要求。本论文中应用非隔离型DC-DC电源变换技术完成开关稳压电源（升压Boost型）的并联均流设计及制作。系统主要分为四个模块，首先由UC3843控制芯片构成的直流电压的升压变换，然后利用
2、UC3902集成IC将两个相同的UC3843模块并联为自动均流电路，再利用ADC0809芯片完成AD转换并将转换后的数据传递给单片机，最后用单片机AT89RC52(51)完成AD转换后的电压数值在数码管上显示。实验证明本系统输出电压具有一定可调范围，噪声、纹波电压低和DC-DC转化效率高的特点。除此之外，该系统还设计了过流保护功能，在电路排除过流故障后，电源具有自动恢复到正常的特点。关键词：开关电源，BoostDC-DC转换，并联均流，AD转换第II页DcswitchingpowersupplyallflowsystemdesignA
3、bstractElectronicequipmentindailypracticalapplicationprocess,oftenbecauseoftheuseofaDCpowersupplyoutputparameters(suchas:power,voltage,current)cannotfulfillthefieldrequirementandbreakdown,thisoftencausesthewholesystemefficiencyislow,devicefromoverheatingandevendamage,so
4、inpracticeusuallyemploysmultiplepowerparalleloperation.Parallelandcurrentsharingtechnologyiscurrentlythefocusofdevelopmentofpowerelectronictechnology,switchingpowersupplyparallelcurrentsharingsystemutilizesapluralityofpowersupplymodulesinparallel,bychangingthenumberofpa
5、rallelmodulestomeettheneedsofdifferentpowerload,eachmodulecanbeverygoodtomeetthepowerperformance,weight,size,efficiency,transportandreliabilityrequirements.InthispaperapplicationofisolatedtypeDC-DCpowerconversiontechnologytocompletetheswitchregulatedpowersupply(boosttyp
6、eBoost)parallelandcurrentsharingofdesignandproduction.Thesystemconsistsoffourmodules,whichfirstbyUC3843controlchipconsistingofDCvoltagestep-upconverter,andthenuseUC3902integratedICtwoidenticalUC3843modulesinparallelforequalizingcircuit,thentheuseofADC0809chipADandconver
7、tingthetransformeddataaretransmittedtothesinglechipmicrocomputer,finallybyAT89RC52singlechipmicrocomputer(51)tocompletetheADconvertedvoltagevaluesinthedigitaltubedisplay.Systemoutputvoltagewithadjustablerange,noise,lowripplevoltageandDC-DCconversionefficiency.Inaddition
8、,thesystemalsohasanovercurrentprotectionfunction,thecircuittoprecludeovercurrentfault,powersupplyisautomatical
