基于LM5117的开关电源设计摘要随着电子技术的高速发展,电子系统的应用领域越来越广泛,电子设备的种类也越来越多,电子设备与人们的工作、生活的关系日益密切。近年来,随着功率电子器件(如IGBT、MOSFET)、PWM技术以及电源理论发展,新一代的电源开始逐步取代传统的电源电路。该电路具有体积小，控制方便灵活，输出特性好、纹波小、负载调整率高等特点。开关电源中的功率调整管工作在开关状态，具有功耗小、效率高、稳压范围宽、温升低、体积小等突出优点，在通信设备、数控装置、仪器仪表、视频音响、家用电器等电子电路中得到广泛应用。开关电源的高频变换电路形式很多,常用的变换电路有推挽、全桥、半桥、单端正激和单端反激等形式。本论文采用——双端驱动集成电路LM5117输的PWM脉冲控制器设计小汽车中的音响供电电源，利用MOSFET管作为开关管，可以提高电源变压器的工作效率，有利于抑制脉冲干扰，同时还可以减小电源变压器的体积。关键词：IGBT，PWM，推挽电路，半桥电路，单端正激ABSTRACTWiththerapiddevelopmentofelectronictechnology,electronicsystems,moreandmoreextensiveapplications,thetypesofelectronicequipment,moreandmoreelectronicequipmentandpeopleworkandlivecloserandcloser.Inrecentyears,withthepowerelectronicdevices(suchasIGBT,MOSFET),PWMswitchingpowersupplytechnologyanddevelopmentofthetheory,anewgenerationofpowerbegantograduallyreplacethetraditionalpowersupplycircuits.Thecircuitissmall,flexibletocontroltheoutputcharacteristicsofagood,ripple,loadadjustmentrateandsoon.Switchingpowersupplyinthepoweradjustmentcontrolworkintheoffstate,withlowpowerconsumption,highefficiency,widevoltagerange,lowtemperaturerise,andotheroutstandingadvantagesofsmallsize,thecommunicationequipment,CNCequipment,Instrumentation,videoaudio,homeappliancessowidelyusedinelectroniccircuits.Highfrequencyconverterswitchingpowersupplysomanyformsofcommonlyusedwithpush-pullconverter,fullbridge,halfbridge,single-endedforwardandtheformofsingle-endedflyback.Inthisthesis,two-sidedriverIC-LM5117PWMpulseoutputofthecontrollerdesigncaraudiopowersupplyinuseasaswitchMOSFET,canimprovetheefficiencyofthepowertransformer,isconducivetoimpulsenoisesuppression,butalsocanreducethesizeofthepowertransformer.KEYWORDS:IGBT，MOSFET，Push-pullcircuit，Halfbridgecircuit,Single-endedforward目录前言.............................................1第1章开关电源基础技术................21.1开关电源概述.......................21.1.1开关电源的工作原理.......21.1.2开关电源的组成..............31.1.3开关电源的特点..............31.2电源电路组成.......................41.3开关电源典型结构..................51.3.1串联开关电源结构............51.3.2并联开关电源结构............51.4电力场效应晶体管MOSFET............71.5开关电源的技术指标............8第2章开关变换电路......................102.1推挽开关变换电路..............102.1.1推挽开关变换基本电路.102.1.2自激推挽式变换器.........112.2半桥变换电路......................142.3正激变换电路......................152.4DC/DC升压模块设计..................16第3章双端驱动集成电路LM5117...........193.1LM5117简介...............................193.2LM5117的工作原理....................203.3LM5117内部电路.......................203.4LM5117构成的PWM控制器电路.....22第4章LM5117在汽车音响供电电源中的应用...............................................244.1汽车音响电源简述..............244.2汽车音响供电电源的组成...264.2.1LM5117的辅助电路设计.......264.2.2主电路的设计................28结论.............................................29谢辞.............................................30参考文献...
