MOSFET升压斩波电路设计说明书

电力电子技术课程设计说明书MOSFET升压斩波电路设计（纯电阻负载）院、部：电气与信息工程学院学生姓名：彭世平指导教师：肖文英职称专业：自动化班级：自本1101班完成时间：2014-05-28I摘要直流斩波电路作为将直流电变成另一种固定电压或可调电压的DC-DC变换器,在直流传动系统、充电蓄电电路、开关电源、电力电子变换装置及各种用电设备中得到普通的应用.随之出现了诸如降压斩波电路、升压斩波电路、升降压斩波电路、复合斩波电路等多种方式的变换电路。MOSFET升压斩波电路又称为boost变换器，它对输入电压进行升压变换。通过控制电路的占空比即通过MOSFET来控制升压斩波电路的输出电压。直流斩波技术已被广泛用于开关电源及直流电动机驱动中，使其控制获得加速平稳、快速响应、节约电能的效果。全控型电力电子器件MOSFET在牵引电传动电能传输与变换、有源滤波等领域得到了广泛的应用。本文设计的是一个可调的直流升压斩波电源，利用MOSFET升压直流斩波电路原理,将直流电变为另一固定电压或可调电压的直流电，也称为直流-直流变换器（DC/DCConverter）。直流斩波电路的控制电路用PWM控制芯片SG3525为核心构成，控制电路输出占空比可调的矩形波。关键词：升压斩波；占空比；变换器IIABSTRACTDCchoppingcircuitasafixedvoltageoradjustablevoltageDC-DCconverterDCinto,intheDCdrivesystem,chargingastoragecircuit,switchingpowersupply,powerelectronicconverterandthecommonapplicationofelectricalequipment.Appearedsuchasdownconvertercircuitmeanspressurechoppercircuit,choppercircuit,Buckchoppercircuit,choppercircuit,composite.MOSFETchoppercircuitisalsoknownastheboostconverter,itisboostedtotransformtheinputvoltage.TheoutputvoltagecyclethroughtheMOSFETtocontroltheboostchoppercontrolcircuit.DCchoppertechnologyhasbeenwidelyusedintheswitchingmodepowersupplyandDCmotor,theaccelerationissmooth,fastresponse,energysavingcontrol.FullcontrolledpowerelectronicdevicesMOSFETintractionelectricdrivepowertransmissionandtransformation,activepowerfilterhasbeenwidelyused.ThisdesignisanadjustableDCchopperpower,usingtheprincipleofMOSFETboostDCchoppercircuit,theDCtoDCvoltageorotherfixedadjustablevoltage,alsoknownastheDCtoDCconverter(DC/DCConverter).ControlcircuitforDCchoppercircuitwiththePWMcontrolchipSG3525asthecore,thecontrolcircuitoutputsadjustabledutycyclerectangularwave.Keywordsboostchopper;dutycycle;converterI目录第1章绪论..................................................................................................................11.1直流斩波电路简介...........................................................................................11.2MOSFET简介..................................................................................................11.3PWM控制芯片SG3525简介.........................................................................11.4仿真软件介绍..................................................................................................21.4.1Multisim..................................................................................................21.4.2MATLAB................................................................................................2第2章MOSFET升压斩波电路设计要求及方案.....................................................32.1设计要求..........................................................................................................32.2设计课题总体方案介绍及工作原理说明.......................................................32.1.1总体方案.................................................................................................32.3设计方案各电路简介......................................................................................32.3.1电容滤波单相不可控整流电路.............................................................32.3.2MOSFET斩波电路................................................................................42.3.3触发电路.................................................................................................42.3.3保护电路.................................................................................................4第三章MOSFET升压斩波主电路设计.....................................................................53.1电容滤波单相不可控整流电路.......................................................................53.1.1电路原理图.............................................................................................53.1.2电路原理及其工作波形.........................................................................53.1.3主要的数量关系.....................................................................................63.2MOSFET升压斩波电路..................................................................................63.2.1电路原理图............................................................................................63.2.2电路原理及其工作波形.........................................................................63.2.3主要的数量关系.....................................................................................7第四章控制电路与保护电路设计..............................................................................84.1MOSFET驱动电路..........................................................................................84.1.1驱动电路原理图.....................................................................................84.1.2电路工作原理........................................................................................8II4.2保护电路..........................................................................................................94.1.1变压器的保护.........................................................................................9第五章总体电路原理图及其说明............................................................................105.1总体电路原理图.............................................................................................105.2MATLAB仿真电路图.............................................