基于Multisim的升压直流稳压电源的仿真摘要摘要开关电源是利用现代电力电子技术，控制开关管开通和关断的时间比率，维持稳定输出电压的一种电源，开关电源一般由脉冲宽度调制（PWM）控制IC和MOSFET构成。本次设计选择的是Boost升压直流斩波电路，升压直流斩波电路可以分为两部分电路块。分别为主电路模块，控制电路模块。主电路模块，主要由全控器件的开通与关断的时间（占空比）来改变输出电压U的大小。控制电路模块，可用一个UC3842芯片来触发产生一个PWM的控制脉冲来控制全控开关的开通与关断。为简化Boost变换器的电路设计，应用Multisim对Boost变换器进行建模，并对全部工作过程进行仿真和分析。根据电路测试显示，电路性能能够很好地满足输出电压的设计要求，并达到了最终升压的目的，从而表明仿真结果正确。关键词：开关电源，双闭环控制，电流模式控制PWM反馈，MultisimI西安交通大学城市学院本科生毕业设计（论文）摘要ABSTRACTSwitchingpowersupplyistheuseofmodernelectronictechnology,thecontrolswitchturn-onandturn-offtimeratio,maintainingthestabilityoftheoutputvoltageofapowersupply,switchingpowersupplyisusuallyconsistsofpulsewidthmodulation(PWM)controlofICandMOSFET.ThisdesignchoiceisBooststep-upDCchoppercircuit,aboostDCchoppercircuitcanbedividedintotwopartsofthecircuitblock.Themaincircuitmodulerespectively,acontrolcircuitmodule.Themaincircuitmodule,mainlybytheIII西安交通大学城市学院本科生毕业设计（论文）controldeviceturn-onandturn-offtime(dutycycle)tochangetheoutputvoltageUsize.Thecontrolcircuitmodule,aUC3842chiptotriggeraPWMcontrolpulsetocontroltheswitchturn-onandturn-off.InordertosimplifytheBoostconvertercircuitdesign,applicationofMultisimtoBoostconverterismodeled,andtheentireworkingprocesssimulationandanalysis.Accordingtothecircuittestshowsthat,theperformanceofthecircuitcanwellmeettherequirementsofoutputvoltage,andreachedthefinalboostingisachieved,therebyindicatingthatthesimulationresultiscorrect.Keywords:Switchpowersupply,Doubleloopcontrol,CurrentmodefeedbackcontrolPWM,Multisim摘要V目录1电源设计的拟定..............................................................11.1前言..................................................................11.1.1课题的来源......................................................31.1.2课题研究的目的和意义............................................51.2论文的主要内容........................................................51.2.1开关电源........................................................51.2.2课题的基本思路..................................................61.2.3几个假定条件....................................................62DC/DC升压斩波变换器的原理分析及设计........................................72.1概述..................................................................72.1.1电路结构........................................................72.2工作模态分析及相关理论推导............................................82.2.1Boost升压斩波电路有电感电流分析.................................82.3控制电路模块.........................................................102.3.1电流型PWM控制实现的几种方案...................................102.3.2手段...........................................................122.3.3技术路线.......................................................132.3.4可行性论证.....................................................132.4电流型PWM升压变换器控制芯片设计.....................................132.4.1UC3842AUC3843A中文资料.......................................132.4.2本次设计所采用的UC3842芯片的...
