具有ZVS的DC-DC升压变换器分析与设计_毕业设计论文.docVIP

具有ZVS的DC-DC升压变换器分析与设计 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 PAGE \* MERGEFORMAT II PAGE \* MERGEFORMAT II Abstract In todays society, solar photovoltaic power generation is receiving more and more attention as the major energy is exhausting. Its advantages make significant contribution to ecological environment and social stability. With high frequency trend of the development of power electronics technology, bipolar boost DC-DC converter in the photovoltaic power generation system has constantly development and improvement. Compared with several basic boost converter, forward boost converter is more reliable. Simultaneously, for the typical defects of the traditional boost converter, its topology is improved. Two special structures of “staggered parallel” and LCD snubber network are added and new phase-shifting control technology is applied. Therefore, a staggered-parallel dual switch of boost converter with snubber circuit for ZVS is put forward. First this article analyzed the structure of LCD lossless snubber network and new phase-shifting technology. And twelve theoretical operating modals is studied in detail. Then it designed a prototype hardware platform based on TMS320F2812. Parameter design of main circuit, components selection, and peripheral circuit’s analysis and design is accomplished. Finally, Pspice simulation and experiment prototype hardware debugging double verified the correctness of the theoretical analysis of the modified boost converter. The feasibility and reliability of the staggered-parallel dual switch of boost converter