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1、摘要隨著全球?qū)δ茉磫栴}的重視，電子產(chǎn)品的耗能問題將愈來愈突出，如何降低其待機(jī)功耗，提高供電效率成為一個(gè)急待解決的問題。傳統(tǒng)的線性穩(wěn)壓電源雖然電路結(jié)構(gòu)簡(jiǎn)單、工作可靠，但它存在著效率低、體積大、銅鐵消耗量大，工作溫度高及調(diào)整范圍小等缺點(diǎn)。為了提高效率，人們研制出了開關(guān)式穩(wěn)壓電源，它的效率可達(dá)85%以上，穩(wěn)壓范圍寬，同時(shí)還具有穩(wěn)壓精度高、不使用電源變壓器等特點(diǎn)，是一種較理想的穩(wěn)壓電源。本次開關(guān)電源的設(shè)計(jì)采用單端反激式拓?fù)浣Y(jié)構(gòu)，采用UC3842作為開關(guān)電源的主控芯片，逐一對(duì)開關(guān)電源的研究現(xiàn)狀、發(fā)展前景以及本次設(shè)計(jì)的
2、原理和電路結(jié)構(gòu)進(jìn)行介紹，其中高頻變壓器的設(shè)計(jì)和控制電路的設(shè)計(jì)是論文的主要內(nèi)容，而開關(guān)電源的基本原理、特點(diǎn)、發(fā)展前景等內(nèi)容簡(jiǎn)要介紹。由于開關(guān)電源的可靠性和安全性是設(shè)計(jì)的基本原則，文章涉及了電路保護(hù)模塊的設(shè)計(jì)和分析。關(guān)鍵詞：開關(guān)電源；uc3842；高頻；變壓；單端反激；AbstractAstheglobalemphasisonenergyissues，electronicsproductofenergydissipationproblemwillbecomemoreandmoreprominent.Howtor
3、educethestandbypowerconsumption,improvingtheefficiencyofpowersupplybecomeapressesforsolutionoftheproblem.Althoughthetraditionallinearregulatedpowersupplycircuithassimplestructure,reliableoperation,butitthereisalowefficiency,largevolume,copperironconsumptio
4、nbig,thehighworkingtemperatureandtheadjustingrangeissmall.Inordertoimprovetheefficiency,peopledevelopedaswitchregulatedpowersupply,itsefficiencycanreachmorethan85%,widevoltagerange,atthesametimealsohasregulatedcharacteristicssuchashighprecision,donotusethe
5、powertransformer,stabilizedvoltagesupplyisakindofideal.Thisdesignofswitchpowersupplywithsingle-endedflybacktopology,usingUC3842asmaincontrolchipofswitchpowersupply,onebyone,researchstatusanddevelopmentprospectsoftheswitchpowerandthedesignprincipleandcircui
6、tstructureareintroduced,includingthedesignofhigh-frequencytransformerandthedesignofcontrolcircuitisthemaincontentofpaper,andthebasicprincipleofswitchpowersupply,characteristicsanddevelopmentprospectarebrieflyintroduced.Duetotheswitchingpowersupplyreliabili
7、tyandsecurityofthebasicprinciplesofdesign,thearticleinvolvesthedesignandanalysisofthecircuitprotectionmodule.Keywords:switchingpowersupply;Uc3842.Highfrequency;Transformer;Single-endedflyback;第一章開關(guān)電源概述11.1開關(guān)電源簡(jiǎn)介11.2開關(guān)電源的原理和組成特點(diǎn)11.2.1開關(guān)電源的原理11.2.2開關(guān)電源組成特點(diǎn)21
8、.3開關(guān)電源應(yīng)用及發(fā)展前景31.3.1開關(guān)電源應(yīng)用31.3.2開關(guān)電源發(fā)展前景5第二章開關(guān)電源設(shè)計(jì)方案72.1變換器設(shè)計(jì)方案論證72.1.1單端反激式開關(guān)電源變換器72.1.2單端正激式開關(guān)電源變換器電路：82.1.3自激式開關(guān)電源變換器電路82.1.4推挽式開關(guān)變換器92.1.5半橋式開關(guān)電源變換器102.2方案的設(shè)計(jì)選擇112.2.1電源設(shè)計(jì)指標(biāo)112.2.2電源設(shè)計(jì)方案選擇11第三章開關(guān)電源系統(tǒng)設(shè)計(jì)123.
