小功率多路隔离开关电源设计摘要电源是确保电气设置可靠、正常稳定工作的主要构成部件。其中，开关管电源以环保节能，稳定高效，轻便简捷等特点成为现代电源研究领域的热门。本文研究小功率多路隔离开关电源的设计，开关电源主要是由以下几个电路构成的，分别为电源的输入电路、功率开关管控制电路、输出电路。输入端的交流电经过整流后转换成直流电提供输入电源，电力电子元器件将整流滤波之后的直流电源经过开关变换器转换成高精度多路隔离直流电源，采用比例积分(PI)控制器控制输出端的直流电压，并对PI参数进行调试，本文的主要研究内容包括：(1)直流电控制系统的总图的设计；(2)IGBT驱动电路的设计；(3)最小系统电路的设计；(4)功率电路的设计；(5)系统的调试和测试。最后通过调制占空比来控制IBGT的开通与关断，实现脉宽调制，对多路输出电压的进行调压。关键词：开关电源，IGBT，脉宽调制ABSTRACTThepowersupplyisanimportantparttoensurereliablethenormalandstableoperationoftheindispensable.Theswitchingpowersupplywithenergysaving,highefficiency,lightandotheradvantagesbecomethehotspotofresearch.Acompleteswitchingpowersupplysystemismainlycomposedofaswitchconverter,inputcircuit,atransformerandacontrolcircuitandanoutputcircuit,CompletionoftheinputACpowerintoDCpowerelectronicequipmentneeded.Switchingpowersupplyisthealternatingcurrentintodirectcurrentdevice，Themaincircuitisthefirstelectricityafterfilter,rectifiercircuitDCisrough,andthenthroughtheDCDCconverter(DC-DC)iseventuallyconvertedtodcaccuracy,Inthispaper,westudylow-powermulti-channelisolationswitchpowersupplydesignmainlyincludes:(1)Thegenerallayoutdesignofdccontrolsystem(2)DesignofIGBTdrivecircuit(3)Thedesignoftheminimumsystemcircuit(4)Thedesignofthepowercircuit(5)ThesystemdebuggingandtestingFinally,throughthemodulationratioofIGBTforopenaircontrolandshutdown,soastorealizetheoutputvoltage.Keywords:Switchingpowersupply;IGBT;Pulsewidthmodulation目录第一章绪论...............................................................................................................21.1引言...................................................................................................................31.2开关电源的发展状况.......................................................................................31.3课题研究的背景及其优点...............................................................................41.4本文主要的研究内容.......................................................................................5第二章开关电源系统总体设计及分析............................................................62.1开关电源的工作原理.......................................................................................62.2四种基本的电路拓扑.......................................................................................82.2.1Buck变换器............................................................................................82.2.2Boost功率变换器...................................................................................92.2.3Buck-Boost功率变换器.......................................................................102.2.4Ćuk功率变换器....................................................................................112.3常用的直流隔离变换器.................................................................................122.3.1单端正激式隔离变换器.......................................................................122.3.2单端反激式隔离变换器..............................................
