基于CCM的单相BoostPFC电路的设计与仿真摘要近年来，为了避免“电网污染”，如何抑制谐波电流、提高功率因数成了备受关注的问题，而有源功率因数校正技术正是行之有效的方法。尤其是在单相Boost型电路中得到了广泛的应用。它是在桥式整流器与负载接一个DC-DC变换器，应用控制电路的电压电流双环反馈，使电网输入电流波形趋于正弦化且相位保持与输入电压相同，从而大幅降低THD,使得PF接近于1。交流输入电压通过全桥后，得到全波整流电压，再经过MOS管的开关控制使输入电流自动跟随输入电压基准的正弦化脉动，并获得稳定的升压输出，给负载提供直流电压源。本文先简要介绍了功率因数校正技术的现状与发展，着重讨论了有源功率因数校正的原理、拓扑结构、控制方式等内容，然后对控制器UC3854进行了简单的构造分析，最后设计出基于UC3854芯片CCM工作模式的BoostPFC电路。关键词：有源功率因数校正，Boost变换器，电流连续模式，平均电流控制，UC3854ABSTRACTInrecentyears,inordertoavoid"gridpollution",howtosuppresstheharmoniccurrent,improvethepowerfactorhasbecomeaconcern,andactivepowerfactorcorrectiontechnologyisaneffectivemethod.Especiallyinsingle-phaseBoost-typecircuithasbeenwidelyused.ItisinthebridgerectifierandtheloadconnectedtoaDC-DCconverter,theapplicationofthecontrolcircuitvoltageandcurrentdoubleloopfeedback,sothatthegridinputcurrentwaveformtendstobesinusoidalandphasetomaintainthesamewiththeinputvoltage,therebysignificantlyreducingtheTHD,makingPFcloseIn1.ACinputvoltagethroughthefullbridge,thefull-waverectifiervoltage,andthenthroughtheMOStubeswitchcontrolsothattheinputcurrentautomaticallyfollowstheinputvoltagereferencesinusoidalpulsation,andobtainastableboostoutputtotheloadtoprovideDCvoltagesource.Inthispaper,thepresentsituationanddevelopmentofpowerfactorcorrectiontechnologyarebrieflyintroduced.Theprinciple,topologyandcontrolmodeofactivepowerfactorcorrectionarediscussedemphatically.Then,thesimplestructureanalysisofcontrollerUC3854iscarriedout.Finally,ChipCCMoperatingmodeBoostPFCcircuit.Keywords:ActivePowerFactorCorrection,Boostconverter,CurrentContinuousMode,Averagecurrentcontrol,UC38542目录1绪论.........................................................................................................................................................11.1功率因数校正的背景意义..............................................................................................................11.2功率因数校正的发展概述..............................................................................................................11.3功率因数校正的实现方法分类.......................................................................................................21.3.1按PFC电路使用的元器件分类...................................................................................................21.3.2按供电方式分类...........................................................................................................................21.3.3按PFC电路的级联方式分类.......................................................................................................21.3.4按PFC电路的电路拓扑结构分类...............................................................................................21.4本文所做的主要工作......................................................................................................................22功率因数校正原理.............................................................................................................................
