反激式开关电源有源箝位的研究

发布时间：2018-05-26 06:41

本文选题：反激式变换器 + 有源箝位　；参考：《辽宁工业大学》2014年硕士论文

【摘要】：反激式变换器相比于采用其它电路拓扑的DC/DC变换器，，具有电路拓扑和控制策略简单、电磁干扰低，及经济性等不可替代的优势。目前在中小功率的应用场合几乎无一例外地采用了反激式变换器，其大部分与人们的生活密切相关，例如移动电话充电器，笔记本电脑电源适配器等。传统的反激式变换器电路拓扑在应用中也存在着问题，其中最为严重的就是变换器效率低。而反激式变换器又是与人们生活最为密切的变换器，其数量非常庞大。在提倡节能减排的今天，解决反激式变换器效率低的问题已成为当务之急，对社会的发展，环境的保护也有着重大的意义。本文简单地回顾了反激式变换器的发展历史，以及人们为了提高反激式变换器效率所做的工作。分析了反激式变换器效率低的因素，即变压器漏感储能的损耗，如果能将变压器漏感储能回收利用，反激式变换器的效率就可以进一步提高。介绍了有源箝位电路拓扑，并对已经采用有源箝位电路拓扑的正激式变换器的工作过程进行了详细的分析，提出了将有源箝位用于反激式变换器的设想，分析了有源箝位电路在正激式变换器和反激式变换器中所起到的不同作用，阐述了具有普遍意义的适合于反激式变换器的有源箝位电路拓扑，并分析了其工作过程。最后提出了本文所采用的双管箝位有源箝位电路拓扑，论证了双管箝位也属于有源箝位的依据，并阐明采用这种电路拓扑的意义，分析了其工作过程及原理。并且在使用有源箝位的基础上附加了准谐振即零电压开关模式，使变换器的效率可以进一步地提高，并分析了这种电路拓扑的工作状态。最后以实验数据证明了采用准谐振模式的双管箝位的反激式变换器所具有的优势。采用准谐振模式的双管箝位电路拓扑，对于改善反激式变换器的效率有着非常重要的作用。提高保有量巨大的反激式变换器的效率，对人类建设节约型社会，保护自然环境有着重大的意义。
[Abstract]:Compared with DC/DC converters with other circuit topologies, flyback converters have the advantages of simple circuit topology and control strategy, low electromagnetic interference and economy. At present, flyback converters are almost always used in medium and small power applications. Most of them are closely related to people's lives, such as mobile phone chargers, laptop power adapters and so on. The traditional circuit topology of flyback converter also has some problems in application, among which the most serious one is the low efficiency of converter. Flyback converter is the closest converter to people's life, and the number of flyback converter is very large. Nowadays, it is urgent to solve the problem of low efficiency of flyback converters, which is of great significance to the development of society and the protection of environment. This paper briefly reviews the history of flyback converters and the work people have done to improve the efficiency of flyback converters. The factor of low efficiency of flyback converter, that is, the loss of transformer leakage inductance energy storage, is analyzed. If the transformer leakage inductance storage energy can be recovered and utilized, the efficiency of flyback converter can be further improved. The active clamp circuit topology is introduced, and the working process of the forward converter which has adopted the active clamp circuit topology is analyzed in detail, and the idea of using active clamp in flyback converter is put forward. The different functions of active clamp circuit in forward converter and flyback converter are analyzed. The topology of active clamp circuit suitable for flyback converter is expounded and its working process is analyzed. In the end, the paper presents the dual-transistor clamp active clamp circuit topology, proves that the dual-tube clamp is also active clamp, and clarifies the significance of adopting this circuit topology, and analyzes its working process and principle. On the basis of active clamping, the quasi-resonant mode is added, which makes the converter more efficient, and the working state of the circuit topology is analyzed. Finally, the advantages of dual-transistor clamped flyback converter with quasi-resonant mode are proved by experimental data. It is very important to improve the efficiency of flyback converter by using quasi resonant mode double transistor clamping circuit topology. It is of great significance to improve the efficiency of the flyback converter which has a large amount of reserves to build a conservation-oriented society and to protect the natural environment.
【学位授予单位】：辽宁工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM46

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