基于UC3842的开关电源设计.doc

基于UC3842的开关电源设计摘要在现代经济和科技的飞速发展的时代，电源的运用已经变得非常常见。目前，各种科技手段正在推动着电力电子技术和电源设备研发技术的快速发展，同时也促使电源设备向着高频化集成化方向发展。电源供电设备的开发和运用已经成为电力电子这门技术的一个非常常见的应用手段。相对于老式的线性稳压器，开关电源的研发与设计设计，虽然比较复杂，有些指标可能不会像线性稳压器，且噪声大，但由于体积小，重量轻，效率高，性能稳定等优点高频开关电源并已被广泛接受和使用。在本文中，给大家详细介绍了一个基于UC3842芯片和反激式变压器的特性设计了一个可以提供两个输出电压，并且可以随着输入电压的变化来调整PWM输出，以确保稳定的输出电压的多输出反激式开关电源。本文介绍了目前我们日常生活中较为常见的开关电源拓扑结构，并通过比较分析选择出适合本次设计的拓扑结构。本文简要介绍了PWM控制芯片UC3842的结构，根据UC3842芯片的特点及应用方式给出了详细的电路参数设计和高频变压器的设计，包括最大占空比计算，初级和次级匝数计算，线径计算。最后，通过PSIM软件对开关电源电路设计建模仿真和仿真波形，利用AD软件进行电路的设计和印刷电路板的设计。关键词：UC3842、反激式、开关电源、AD、PSIMAbstractIntheeraofrapideconomicandtechnologicaldevelopment,theuseofpowerhasbecomeverypopular.Currently,varioustechnologiesaredrivingtherapiddevelopmentofpowerelectronicsandpowerequipmentR&Dandtechnology,butalsotopromotethepowerofhigh-frequencyintegrateddirection.Developmentanduseofelectronicpowertechnologyhasbecomeaverycommonpowerapplicationmeans.Forolderlinearregulators,switchingpowersupplydesignanddevelopmentanddesign,althoughmorecomplicated,someindicatorsmaynotbeaslinearregulators,andnoise,butduetosmallsize,lightweight,highefficiency,high-frequencyperformanceandstabilityswitchpowersupply,andithasbeenwidelyacceptedandused.Inthisarticle,theFoundationtoexplaintoyouisdesignedtoprovidethefeaturesandUC3842chipoutputvoltageflybacktransformer,andcanchangetheinputvoltagechangestoadjustthePWMoutputtoensurethatthemultiplexerthestabilityoftheoutputvoltageoutputflybackswitchingpowersupply.Thispaperdescribesthecurrentinourdailylivesmorecommonswitchingpowersupplytopologiesandchoosethetopologyofthisdesignwerecompared.ThispaperdescribesthestructureofthePWMcontrolchipUC3842,accordingtothecharacteristicsandhowtheproductisgivenadetailedcircuitparametersandhighfrequencytransformerdesign,includingthecalculationofthemaximumdutycycle,primaryandsecondaryturnscalculationapplicationchipUC3842Method.Finally,PSIMsoftwareswitchingpowersupplycircuitdesignandsimulationsoftwareformodelingandsimulationwaveformsusingADcircuitdesignandprintedcircuitboarddesign.K