学士学位论文--具有zvs的dcdc升压变换器分析与设计.doc

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1、摘要随着当今社会主要能源的日益枯竭，太阳能光伏发电越来越受到重视。其良好的优越性对于经济生态环境和社会稳定发展有着重要意义。随着电力电子技术高频化的发展趋势，升压DC-DC变换器在两极式光伏发电系统中的应用得到了不断的发展和完善。对比几种基本的升压变换器发现，正激升压变换器更为可靠。同时针对传统的正激变换器的典型缺陷，对其进行了拓扑改进，加入“交错并联”和LCD缓冲网络两种特殊结构，并运用新型移相控制技术，提出了具有缓冲电路的ZVS交错并联双管正激升压变换器。本文首先对其结构中的LCD无损缓冲网络、新型移相控制技术进行分析，详细研

2、究了十二个理论工作模态，然后设计了以TMS320F2812为控制中心的硬件实验样机平台，完成了主电路参数设计、器件选型、外围电路分析与设计。最后通过PSpice软件仿真和实验样机硬件调试双重验证了文中改进型升压变换器理论分析的正确性，也证明了具有缓冲电路的ZVS交错并联双管正激升压变换器的可行性与可靠性。关键词：光伏发电；升压变换器；零电压；LCD缓冲网络；移相控制AbstractIntoday'ssociety,solarphotovoltaicpowergenerationisreceivingmoreandmoreatten

3、tionasthemajorenergyisexhausting.Itsadvantagesmakesignificantcontributiontoecologicalenvironmentandsocialstability.Withhighfrequencytrendofthedevelopmentofpowerelectronicstechnology,bipolarboostDC-DCconverterinthephotovoltaicpowergenerationsystemhasconstantlydevelopme

4、ntandimprovement.Comparedwithseveralbasicboostconverter,forwardboostconverterismorereliable.Simultaneously,forthetypicaldefectsofthetraditionalboostconverter,itstopologyisimproved.Twospecialstructuresof“staggeredparallel”andLCDsnubbernetworkareaddedandnewphase-shiftin

5、gcontroltechnologyisapplied.Therefore,astaggered-paralleldualswitchofboostconverterwithsnubbercircuitforZVSisputforward.FirstthisarticleanalyzedthestructureofLCDlosslesssnubbernetworkandnewphase-shiftingtechnology.Andtwelvetheoreticaloperatingmodalsisstudiedindetail.T

6、henitdesignedaprototypehardwareplatformbasedonTMS320F2812.Parameterdesignofmaincircuit,componentsselection,andperipheralcircuit’sanalysisanddesignisaccomplished.Finally,Pspicesimulationandexperimentprototypehardwaredebuggingdoubleverifiedthecorrectnessofthetheoretical

7、analysisofthemodifiedboostconverter.Thefeasibilityandreliabilityofthestaggered-paralleldualswitchofboostconverterwithsnubbercircuitforZVSareproved.Keywords:photovoltaicpowergeneration,zero-voltage-switch,LCDsnubbernetwork,phase-shifting,boostconverterI目录摘要IAbstractII第

8、1章绪论11.1课题来源及研究的目的和意义11.2双管正激变换器国内外研究现状31.3主要研究内容与方案51.3.1改进型交错并联双管正激升压变换器主拓扑结构的确定51.3.2具有ZVS升压变换器主电路PSpice仿真验证61.3.3具有ZVS升压