【作者】 王红梅；

【导师】 龚春英；

【作者基本信息】 南京航空航天大学 ， 电力电子与电力传动， 2006， 硕士

【摘要】 本文以两级式航空静止变流器的前级(即DC/DC级)为主要研究对象,针对效率和高频化问题,在充分考虑飞机低压供电系统中的航空静止变流器前级DC/DC输入电压低、范围宽、输入电流大、应用在中小功率场合等特点,以及深入理解DC/DC变换器各拓扑特点的基础上,选择了交错并联反激变换器作为基本拓扑进行了一些研究工作。首先,对反激变换器的发展与现状做了全面的概述,比较了反激变换器各种缓冲电路的优缺点。然后引出本文所要研究的新型交错并联反激变换器电路拓扑。本文重点对首次提出的新型交错并联反激变换器电路拓扑进行了系统的理论分析及实验研究。由于箝位电容的加入,相对于其他类型的反激式变换器电路,该拓扑具有一些独特的优点:电路结构简单且易于实现;无需另加辅助开关管,实现了开关管的有源箝位,抑制了开关管的电压尖峰;提高了输入、输出电流的脉动频率,减小了输入及输出滤波器体积。文中详细分析了该新型变换器的工作原理,并给出了主要参数设计方法,还重点分析了箝位电容的作用及其选取原则;同时,还建立了单电压环控制的新型交错并联反激变换器的小信号模型,并对其稳定性进行了仿真研究。最后在此理论分析的基础上研制了一台原理样机,并通过实验验证了理论分析的正确性。更多还原

【Abstract】 Aimed to acquire high efficiency and high frequency of the converter, this paper researches on the forepart of the Aeronautical Static Inverter(ASI)—DC/DC converter. The forepart of the ASI has characters as follows: Low and wide range of the input voltage, high input current and usually be used in middle and small Power applications. Based on the comprehensive research on DC/DC converter topologies,the novel interleaved flyback converter is presented and studied in this paper.Firstly, the summarize of the development and actuality of flyback converter is given, and different snubber circuits applied in the flyback converter are analyzed and compared。Then the novel interleaved flyback topology is proposed.The novel interleaved flyback converter is researched systemically based on theoretical analysis and experimental studies in this paper. Because of the clamping capacitor and the interleaved structure, it has some good features compared with other flyback converters, such as: the topology is simple and can be realized easily; the voltage spike of the power switch is availably restrained and without leakage-inductance energy loss; the ripple of the input and output current is reduced, correspondingly, the volume and weight of the output and input filter is also significantly reduced. The detailed theoretical analysis of this novel interleaved flyback converter and the key design process are described, the functions of the clamping capacitor are analyzed, the little signal model of the presented converter is established and the stability of the voltage-controlled system is discussed. At last, a prototype based on the novel interleaved flyback converter is accomplished and experimentally verified.更多还原