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双降压式半桥逆变器及输出并联型组合变换器研究
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摘要
研究了双降压式半桥逆变器及以双降压式半桥逆变器为代表的输出并联组合变换器。输出并联组合变换器采用两个基本单向直-直变换器在输出侧并联得到,可四象限运行,为逆变和交流电压变换提供了一条高效简洁的新途径。全文主要内容如下:
     对采用两个基本直-直变换器构建组合逆变器的一般方式、指导原则和工作原理进行了系统的归纳、总结和引申;提出了参照双降压式半桥逆变器思想构建的输出并联组合逆变器各拓扑;对其中的代表电路:双升压式半桥逆变器、双升降式半桥逆变器和输出并联反激逆变器进行了分析和验证;并将本文输出并联组合逆变器的特点和应用场合同输出串联组合逆变器进行了比较。
     双降压式半桥逆变器作为一种高效可靠的逆变拓扑,是输出并联组合逆变器的代表和源起。本文对其运行方式、损耗分析、参数设计、控制方案、建模分析、应用拓展等各方面进行了详细研究;双降压式半桥逆变器的深入研究对分析输出并联组合变换器其它拓扑具有借鉴和指导作用。
     传统多电平变换器均采用桥式电路为基本拓扑,采用以双降压式半桥逆变器为代表的输出并联组合拓扑构建或演化得到的多电平逆变器,具有无桥臂直通、可靠性高、高效、电路相对简洁等特点。本文提出了构建多电平双降压半桥逆变器的一般方法;在此基础上提出了多种多电平双降压半桥逆变器拓扑;对它们的特点和应用场合进行了分析和综合比较;多电平技术的引入也是对双降压式半桥逆变器本身的改进和在高压场合应用的拓展。
     输出并联组合变换器包含多个磁件。本文研究了用于输出并联组合变换器的磁集成技术:提出了几种磁集成输出并联组合逆变器拓扑并进行了分析比较;指出了电感直接耦合可能带来的环流问题和解决方法;讨论了如何采用耦合电感解决三电平双降压式半桥逆变器的换流问题并简化其电路。输出并联组合变换器的磁集成技术研究散见于本文各章。
     本文最后研究了输出并联组合变换器在交流电压变换场合的应用:系统提出了输出并联组合方式构建的各种非隔离型和隔离型交流斩波器拓扑;研究了它们的工作方式和电路特点;给出了仿真或实验验证;并将本文输出并联交流斩波器同输出串联构建交流斩波器进行了比较。
Dual buck half bridge inverter and other parallel-output inverters has been taken as research object in this paper. Parallel-output topology, composed of two basic unidirectional DC-DC converters whose output sides are connected in parallel, can operate in four quadrants. It is a highly reliable and efficiency way for DC to AC or AC to AC voltage converter.
     The basic principle and mode how new inverter topologies are composed with basic DC-DC converters have been summarized in this paper at first. And then several new inverter topologies according to the same mode in which dual buck half bridge inverter composed have been proposed. Dual boost half bridge inverter, dual buck/boost half bridge inverter and parallel-output dual flyback inverter, which are typical circuits of parallel output inverter, have been analyzed and verified in this paper. Their features and applications have been compared with series-output inverter at the same time.
     Dual buck half bridge inverter is the agent and origin of parallel-output inverter. Basic problems of this converter including Operation mode , loss analyze, parameter design, control scheme, mode building and applications have been researched all in detail, and researches on other parallel-output inverters can borrow from these analysis.
     The topology used by traditional multilevel converter is always H bridge. New multilevel inverters proposed in this paper, who taken dual buck half bridge inverter and other parallel-output circuits as basic topology, has the characteristics of high frequency and efficiency. The basic principle and mode how new multilevel dual buck inverter topologies are composed have been summarized in this paper, and then several new topologies are proposed. Their features and applications have been analyzed and compared too. Multilevel dual buck inverter, which have uni-polarity PWM waveforms output and lower voltage stress is also the improvement of two-level dual buck half bridge inverter.
     There are several magnetics in parallel-output inverters. Integrated Magnetics technology used in parallel-output inverters has been researched in this paper. Several new parallel-output inverters with integrated magnetics have been proposed and compared. An unexpected bias current will be produced if we use a coupled inductor to replace the two separated inductors of dual buck half bridge inverter directly. Novel dual buck inverter with integrated magnetics of four windings which can resolve this bias problem has been proposed in this paper. How integrated magnetics could be used to overcome peak voltage problem of multilevel dual buck inverter has also been discussed in the paper. Consents of integrated magnetisc distributed in chapters of this paper.
     Application that parallel-output converters used in AC to AC voltage conversion has been discussed in this paper at last. Combined AC choppers and isolate AC choppers composed in parallel-output mode have been systematically proposed. Their working modes and characteristics are researched, simulation and experiments as verify. Parallel-output AC choppers have been compared with series-output AC choppers at last in this paper.
引文
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