中图分类号:TM461学科分类号:080804论文编号:102870309-0183硕士学位论文数字控制通信高频开关电源的研究研究生姓名邵艳红学科、专业电力电子与电力传动研究方向电力电子变换器技术指导教师杨善水副教授南京航空航天大学研究生院自动化学院二ОО九年一月NanjingUniversityofAeronauticsandAstronauticsTheGraduateSchoolCollegeofAutomationEngineeringResearchonCommunicationHighFrequencySwitchingPowerSupplyBasedonDigitalControlAThesisinElectricalEngineeringbyShaoYanhongAdvisedbyAssociateProfessor.YangShanshuiSubmittedinPartialFulfillmentoftheRequirementsfortheDegreeofMasterofEngineeringJanuary,2009承诺书本人声明所呈交的硕士学位论文是本人在导师指导下进行的研究工作及取得的研究成果。除了文中特别加以标注和致谢的地方外,论文中不包含其他人已经发表或撰写过的研究成果,也不包含为获得南京航空航天大学或其他教育机构的学位或证书而使用过的材料。本人授权南京航空航天大学可以将学位论文的全部或部分内容编入有关数据库进行检索,可以采用影印、缩印或扫描等复制手段保存、汇编学位论文。(保密的学位论文在解密后适用本承诺书)作者签名:日期:南京航空航天大学硕士学位论文I摘要随着通信技术的不断发展,人们对通信电源提出了更高的要求。本文针对通信电源中DC/DC变换器的移相全桥主电路进行了分析和研究,在此基础上提出了采用改进型倍流整流移相全桥电路,来克服传统ZVSPWM全桥变换器存在的一些问题。本文详细分析了改进型倍流整流移相全桥电路的工作原理,利用状态空间平均法分析了倍流整流移相全桥变换器主电路,对其建立了动态模型,并采用移相控制芯片UC3875进行了仿真研究。因为和传统的变压器相比,平面变压器具有体积小、高电流密度、高效率、低漏感等优点,数字控制具有高灵活性、高精度等优点,所以两者成为当前开关电源的研究热点,也是通信电源的发展方向。因此,本文详细介绍了平面变压器的特点及其设计方法,并对数字控制方法进行了研究。本文设计了一台数字控制的通信高频开关电源样机,主电路中采用平面变压器,控制部分采用以TMS320F2812为核心,加上调理、通信等电路构成的数字控制平台,实现对整个变换器的控制、保护和监控。最后给出了实验波形,验证了上述理论的正确性。关键词:通信电源,移相全桥,倍流整流,数字控制,平面变压器数字控制通信高频开关电源的研究IIABSTRACTWiththefastdevelopmentofcommunicationstechnology,communicationspowersupplyisraisedexcelsiorrequirement.ThePSFBcircuit,whichisthemaincircuitofDC/DCconverterofcommunicationspowersupply,isanalysedandstudiedinthispaper.AccordingtothecharacteristicofPSFBcircuit,theZVSPWMCurrentDoublerRectifiertopologyisproposedtoovercometheshortageoffullwaverectifier.Inthispaper,theprincipleofaPSFBconverterwithCDRhasbeenanalyzedindetail.Then,themeanofstate-spaceaverageisusedtoanalyzethemaincircuitandadynamicmodelisestablished.Toverifytheprinciple,aphase-shiftingcontrolchipUC3875isusedforthesimulationstudy.Finally,thesimulationresultsarepresent.Digitalcontrolandplanartransformerhavebeentwohotspotsinpowerelectronicsfieldbecauseoftheirstrongsuits.Forexample,digitalcontrolhashighfeasibilityandhighprecision;planartransformerhaslittlevolume,highcurrentdensity,highefficiencyandlowleakageinductance,comparedtothetraditionaltransformer.So,thispaperresearchesthedigitalcontrolinpowersupply,introducesthecharacteristicofplanartransformerandhowtodesignit.Aprototypeofcommunicationspowersupplybasedondigitalcontrolispresentedinthispaper,includingmaincircuitandcontrolcircuit.Planartransformerisusedinthemaincircuit.ThedigitalcontrolplatformiscomposedofTMS320F2812,whichisthecoreofthecontrolcircuit,modulatingandcommunicationcircuitandsoon.Theplatformnotonlyfinishesthewholecontroloftheconverterbutalsodoestheprotectingandmonitor.Toverifytheprinciple,experimentalresultsaregivenintheend.KeyWord:CommunicationPowerSupply,PSFB,CDR,DigitalControl,PlanarTransformer南京航空航天大学硕士学位论文III目录第一章绪论..........................................................................................................................................11.1通信电源系统的介绍..................................................................................................................11.2通信直流一次电源的发展和国内外现状..................................................................................21.3本文研究的主要内容..................................................................................................................3第二章通信电源拓扑的分析与建模...................................................................................................52.1通信电源拓扑的选择..................................................................................................................52.2改进型倍流整流移相全桥变换器连续状态的分析与设计......................................................52.2.1改进型倍流整流移相全桥变换器连续状态的分析...........................................................52.2.2超前管和滞后管实现零电压开通的差异...........................................................................82.2.3倍流电路关键参数的设计...................................................................................................92.3倍流整流断续状态分析............................................................................................................112.3.1断续电流的分析推导.........................................................................................................132.4仿真分析...................................................................................................................................142.5倍流整流全桥变换器模型........................................................................................................152.5.1Buck变换器的小信号模型...............................................................................................152.5.2倍流整流移相全桥变换器的小信号模型.........................................................................182.6本章小结...................................................................................................................................20第三章数字控制方法和平面变压器技术的研究.............................................................................223.1数字控制方法的研究................................................................................................................223.1.1数字PID控制器..........................