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1、摘要开关电源是应用于广泛领域的一种电力电子装置。它具有电能转换效率高、体积小、重量轻、控制精度高和快速性好等优点，在小功率范围内基本取代了线性电源，并迅速想大功率范围推进，在很大程度上取代了晶闸管相控整流电源。可以说，开关电源技术是目前中小功率直流电能变换装置的主流技术。本文首先描述了开关电源的发展，对目前出现的几种典型的开关电源技术作了归纳总结和分析比较，在此基础上指出了开关电源技术的发展状况和开关电源产品的发展趋势。并且对开关电源的发展史、应用范围、主电路的选择、控制方法作了简要的介绍。在设计中主要采用了脉宽调制（PWM）、全桥整流、自锁保护等技术，应用了控制芯片UC3
2、842做为PWM控制芯片，对变压器次级线圈采用堆叠式绕法，改进光耦反馈电路的选择，使电路能达到所需基本要求同时，力求稳定、高效。关键字：开关电源，拓扑结构，变压器，正激式IAbstractTheswitchpowersupplyisakindofelectricpowerelectronicswhichappliesintheextensiverealmtobeused.Ithasanelectricpowerconversion'sefficiencyhigh,thephysicalvolumeissmall,theweightislight,thecontrolaccu
3、racyishighwithfastetc.advantage,withinthescopeofsmallpowerreplacedlinepowersupply,andinhigh-powerscopepropulsionquickly,toalargeextent,itreplacedthethyristorphase-controlledrectifyingpowersupply.Wecansay,theswitchpowersupplytechniqueistheessentialtechniquewhichwinssmallelectricpowertransfo
4、rmationofthepowerdirectcurrenttoequipcurrently.Thistextdescribedthedevelopmentofswitchpowersupplyfirst,toafewkindswhichappearcurrentlytypicalmodeloftheswitchpowersupplytechniquemadetoinducesummaryandanalysiscomparison,pointingoutthedevelopmenttrendofthetechnicaldevelopmentconditionoftheswi
5、tchpowersupplyandswitchpowersupplyproductonthisfoundation.Andintroducetheswitchpowersupply’sphylogeny,application,mainelectriccircuitofpowersupplyandcontroledamethod.ThedesignadoptedPWM,thewholebridgesescommutated,lockprotectionetc.technique,appliedcontrolthechipUC3842tobeusedasPWMcontrolc
6、hip,thetransformeradoprtadoptpilecircle,improvethechoiceoftheelectriccircuit,maketheelectriccircuitbeabletoattainneedbasicrequestinthemeantime,tryhardforstability,efficiently.Keywords：Switchpowersupply，topology，transform，ForwardII目录摘要........................................................
7、..........................................................................................IAbstract............................................................................................................................................II目录.................
