摘要随着全球对能源问题的重视，电子产品的耗能问题将愈来愈突出，如何降低其待机功耗，提高供电效率成为一个急待解决的问题。传统的线性稳压电源虽然电路结构简单、工作可靠，但它存在着效率低、体积大、铜铁消耗量大，工作温度高及调整范围小等缺点为了提高效率，人们研制出了开关式稳压电源，它的效率可达85%以上，稳压范围宽，同时还具有稳压精度高、不使用电源变压器等特点，是一种较理想的稳压电源。本次开关电源的设计采用单端反激式拓扑结构，采用UC3842作为开关电源的主控芯片，逐一对开关电源的研究现状、发展前景以及本次设计的原理和电路结构进行介绍，其中高频变压器的设计和控制电路的设计是论文的主要内容，而开关电源的基本原理、特点、发展前景等内容简要介绍。由于开关电源的可靠性和安全性是设计的基本原则，文章涉及了电路保护模块的设计和分析。关键词：开关电源；uc3842；高频；变压；单端反激；AbstractAstheglobalemphasisonenergyissues，electronicsproductofenergydissipationproblemwillbecomemoreandmoreprominent.Howtoreducethestandbypowerconsumption,improvingtheefficiencyofpowersupplybecomeapressesforsolutionoftheproblem.Althoughthetraditionallinearregulatedpowersupplycircuithassimplestructure,reliableoperation,butitthereisalowefficiency,largevolume,copperironconsumptionbig,thehighworkingtemperatureandtheadjustingrangeissmall.Inordertoimprovetheefficiency,peopledevelopedaswitchregulatedpowersupply,itsefficiencycanreachmorethan85%,widevoltagerange,atthesametimealsohasregulatedcharacteristicssuchashighprecision,donotusethepowertransformer,stabilizedvoltagesupplyisakindofideal.Thisdesignofswitchpowersupplywithsingle-endedflybacktopology,usingUC3842asmaincontrolchipofswitchpowersupply,onebyone,researchstatusanddevelopmentprospectsoftheswitchpowerandthedesignprincipleandcircuitstructureareintroduced,includingthedesignofhigh-frequencytransformerandthedesignofcontrolcircuitisthemaincontentofpaper,andthebasicprincipleofswitchpowersupply,characteristicsanddevelopmentprospectarebrieflyintroduced.Duetotheswitchingpowersupplyreliabilityandsecurityofthebasicprinciplesofdesign,thearticleinvolvesthedesignandanalysisofthecircuitprotectionmodule.Keywords:switchingpowersupply;Uc3842.Highfrequency;Transformer;Single-endedflyback;第一章开关电源概述..............................................................................................................11.1开关电源简介.........................................................................................................11.2开关电源的原理和组成特点..................................................................................11.2.1开关电源的原理...........................................................................................11.2.2开关电源组成特点..........................................................................................21.3开关电源应用及发展前景.........................................................................................31.3.1开关电源应用..................................................................................................31.3.2开关电源发展前景..........................................................................................5第二章开关电源设计方案......................................................................................................72.1变换器设计方案论证.................................................................................................72.1.1单端反激式开关电源变换器.................................
