本文選題：反激式變換器 + 有源箝位　； 參考：《遼寧工業(yè)大學》2014年碩士論文

【摘要】：反激式變換器相比于采用其它電路拓撲的DC/DC變換器，，具有電路拓撲和控制策略簡單、電磁干擾低，及經濟性等不可替代的優(yōu)勢。目前在中小功率的應用場合幾乎無一例外地采用了反激式變換器，其大部分與人們的生活密切相關，例如移動電話充電器，筆記本電腦電源適配器等。傳統(tǒng)的反激式變換器電路拓撲在應用中也存在著問題，其中最為嚴重的就是變換器效率低。而反激式變換器又是與人們生活最為密切的變換器，其數量非常龐大。在提倡節(jié)能減排的今天，解決反激式變換器效率低的問題已成為當務之急，對社會的發(fā)展，環(huán)境的保護也有著重大的意義。 本文簡單地回顧了反激式變換器的發(fā)展歷史，以及人們?yōu)榱颂岣叻醇な阶儞Q器效率所做的工作。分析了反激式變換器效率低的因素，即變壓器漏感儲能的損耗，如果能將變壓器漏感儲能回收利用，反激式變換器的效率就可以進一步提高。介紹了有源箝位電路拓撲，并對已經采用有源箝位電路拓撲的正激式變換器的工作過程進行了詳細的分析，提出了將有源箝位用于反激式變換器的設想，分析了有源箝位電路在正激式變換器和反激式變換器中所起到的不同作用，闡述了具有普遍意義的適合于反激式變換器的有源箝位電路拓撲，并分析了其工作過程。最后提出了本文所采用的雙管箝位有源箝位電路拓撲，論證了雙管箝位也屬于有源箝位的依據，并闡明采用這種電路拓撲的意義，分析了其工作過程及原理。并且在使用有源箝位的基礎上附加了準諧振即零電壓開關模式，使變換器的效率可以進一步地提高，并分析了這種電路拓撲的工作狀態(tài)。最后以實驗數據證明了采用準諧振模式的雙管箝位的反激式變換器所具有的優(yōu)勢。 采用準諧振模式的雙管箝位電路拓撲，對于改善反激式變換器的效率有著非常重要的作用。提高保有量巨大的反激式變換器的效率，對人類建設節(jié)約型社會，保護自然環(huán)境有著重大的意義。
[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.
【學位授予單位】：遼寧工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM46

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本文編號：1936319