脉冲电源设计

基本技能实习(作品

摘要

关键词：网络技术；在线考试；浏览器/服务器模式；JSP；SQLserver2000电源设备用以实现电能变换和功率传递，是各种电子设备正常工作的基础。而脉冲电源由于具有断续供电的特性，在电火花加工、脉冲电镀、电弧焊接、高功率激光泵、高频脉冲感应加热、工业废气处理、脉冲电解污水处理、静电除尘、臭氧制取和表面热处理等领域获得了广泛的应用。应用领域不同，对脉冲电源的性能和特征参数的要求就存在差别，因而实现方法也各异。论文在考察了多种脉冲电源的特点和实现方法后，自行研制了一种幅值、频率、占空比可调的新型智能化高频脉冲电源，具有广泛的工程应用前景和理论学术意义

论文采用直流斩波原理，利用体积小、重量轻、效率高、可靠性好的开关电源作为直流供电电源。设计了以电流型控制芯片UC3842为核心，配合高频变压器、MOSFET输出储能电感、采样反馈通道等主要元器件，实现输出电压在0~48V连续可调，脉冲电流频率10HZ~1000HZ连续可调,脉冲电流幅值0~5A连续可调,脉宽100~1000us连续可调。同时，采用小信号分析的方法，建立了开关电源主电路的等效小信号模型，并通过将电流电压双环控制系统转化为单环控制系统获得了开关电源系统的传递函数，在分析系统频

率特性的基础上设计了系统的补偿器，仿真结果表明，补偿后的系统具有良好的动态特性

结合一定的软件程序，建立了以W77E58为核心的智能控制系统，实现脉冲信号的调整和驱动，从而对前述的开关电源进行控制，以获得可调整的脉冲电压。智能控制部分主要包括模拟量输入通道模块、人机接口模块、分频模块、隔离驱动模块等功能模块。

论文的最后对所研制的可调脉冲电源进行了相关的实验研究，主要测试了其功能规格和保护特性，并分析讨论了测试结果。实验结果表明，该脉冲电源的输出电压调整特性、负载调整率、输出纹波、动态响应等均满足了一定的要求，并具有良好的过载、短路保护特性和波形特性

关键词:脉冲电源;开关电源:小信号分析:微机控制

Abstract

Asthefundamentofvariableelectricalequipments,powersuppliesrealizepower changinganddelivery.Pulsepowersupply,withitsdiscretecharacteristic,hasawideap plicationinthefieldofEDM,pulseelectroplating,electricweld,highpowerlaser pump,highfrequencyinductionheating,purificationofexhaustgasandwasterwa ter,electrostaticdustprecipitation,ozoneproductionandsurfaceheattreatment.Indiff erentfields,demandsofperformanceandparametersofpulsepowersupplyarevariable,s oasthetechniquesofmanipulation.Aftertheresearchoncharacteristicsandprinciples of}xianypulsepowers,anovel,intelligent,highfrequencypulsepowersupplywithadj ustableamplitude,frequencyanddutyisdevelopedwhichhasafavorableforegroundin engineeringapplicationandagreattheoreticalsignificance.Withchoppingprinciple,s witchingpowersupplyischosenastheDCpowersupplybecauseofitssmallsize,lowwe ightandhighefficiency.WiththeapplicationofcurrentmodecontrolchipUC3842asth ecoreofthecircuit,analwiththecooperationofhighfrequencytransformer,MOSPET, outputinductor,samplingandfeedbackcircuit,a

forwardconverterisprojectedwhosemaximaloutputvoltagecanberegulatedbet ween5Vto30Vcontinuously,Pulsefrequencycanberegulatedbetween10HZ-1000H Zcontinuously,pulsecurrentamplitudecanberegulatedbetween0~5Acontinuously, pulsewidthcanberegulatedbetween100~1000uscontinuously.Moreover,basedons

mallsignalanalysismethod,theequivalentsmall-signalmodelofthemaincircuitisachi eved,andthesystemtransferfunctionisestablishedbypredigestingthedoublecontroll ooptoasingleone.Qnthebasisoftransferfunction,thefrequencycharacteristicofthesy stemisanalyzedandthecompensatorisdesigned.Emulationresultsshowagooddyna miccharacteristicoftheclosedsystemInordertocontroltheforementionedswitchingp owersupplytoaccomplishanadjustablepulsevoltage,themicrocontrollerW77E58is combinedwithsomeprogramstoformanintelligentcontrolsystemwhoseprimaryfun ctionisregulatinganddrivingpulsesignal.Andthemainmodulesofthesystemcontaina naloginputmodule,userdialogmodule,frequencydividingmoduleandisolate-drivin gmodule.Attheendofthispaper,pertinentexperimentswhichmostlyfocusonfunction andprotectiontesthavebeencarriedoutonthepulsepowersupply.Basedontheresults,t heverypulsepowersupplymeetscorrespondingfunctionrequirementsonoutputvolta geregulation,loadregulation,outputrippleanddynamicresponse,andthepoweralsoh asatolerablewaveformspecialityandanexcellentabilityofovercurrentprotectionand shortprotection.

KeyWords:PulsePowerSupply;SwitchingPowverSupply;SmallSignalA nalyze;Micro-control