半桥式开关电源设计洛阳理工学院毕业设计（论文）I半桥式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,电子设备的种类也越来越多,电子设备与我们的工作、生活的关系日益密切。近年来,随着功率电子器件(如IGBT、MOSFET)、PWM技术以及电源理论的快速发展,新一代的电源电路开始逐步取代传统的电源电路。该电源电路具有体积小，控制灵活方便，输出特性好、纹波小、负载调整率高等显著优点。由于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，因此在通信设备、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、单端正激式和单端反激式等形式。本论文采用双端驱动集成电路——TL494输的PWM脉冲控制器设计音响设备供电电源，利用BJT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：TL494，PWM，半桥式电路，开关电源洛阳理工学院毕业设计（论文）IIDesignofHalfBridgeSwitchingPowerSupplyABSTRACTWiththerapiddevelopmentofelectronictechnology,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-TL494PWMpulseoutputofthecontrollerdesigncaraudiopowersupplyinuseasaswitchMOSFET,canimprovetheefficiencyofthepowertransformer,isconducivetoimpulsenoisesuppression,butalsocanreducethesizeofthepowertransformer.KEYWORDS:TL494,PWM,Halfbridgecircuit,Switchingpower洛阳理工学院毕业设计（论文）III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开关电源的构成.................................................31.1.3开关电源的特点.................................................41.2开关电源典型结构...........................................................41.2.1串联开关电源结构.............................................51.2.2并联开关电源结构.............................................51.2.3正激式结构.........................................................71.2.4反激式结构.........................................................81.2.5半桥型结构.........................................................91.2.6全桥型结构.......................................................101.3开关电源的技术指标.....................................................11第2章半桥变换电路........................................
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