采用倍流整流电路的半桥 变换器研究.doc

采用倍流整流电路的半桥变换器研究
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本科毕业设计(论文)
采用倍流整流电路的半桥
变换器研究
苑梦雄
燕山大学
2013年6月
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本科毕业设计(论文)
采用倍流整流电路的半桥
变换器研究
学院(系):电气工程学院___
专业:09级应用电子__
学生姓名:苑梦雄_________
学号:090103030092___
指导教师:吴俊娟_________
答辩日期:2013年6月24日__
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燕山大学毕业设计(论文)任务书
摘要
摘要
随着信息技术的迅速发展,中小功率变换器在计算机、、更有效的要求,对变换器的要求也不断提高,使得变换器向着更低的输出电压、更高的输出电流、更高的效率,更快的动态响应以及更高的可靠性等方向发展。
本文首先介绍了VRM的发展历程,研究现状和面临的挑战,并结合设计的关键性问题,研究了一种符合设计指标的倍流整流半桥变换器。通过对倍流整流电路与其他副边整流电路的比较,得出倍流整流电路特别适合隔离型低压、大电流输出的DC/DC变换器的结论,并对倍流整流电路与原边半桥拓扑结合后的控制方法进行了比较。分析了半桥倍流整流电路的工作原理,分析了个工作模式下的稳态特性。并建立了具有倍流整流电路的半桥变换器的等效受控源模型,进而得出其小信号模型。为闭环系统的搭建奠定基础。
最后,在理论的基础上,使用MATLAB软件对设计的变换器进行仿真。
关键词电压调节模块倍流整流电路半桥变换器
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Abstract
With the rapid development of information technology, small or medium-sized power converters have been widely used munication applications and other kinds of industry order to satisfy the need of a faster and more efficient data processing in such fields
,the power converters are needed to be equipped with the qualities of lower output voltage,higher output current, higher efficiency ,faster dynamic response and higher reliability .
In this paper the developing process, research situation and challenges of VRM are first introduced, then connected with the key issues of the design, a half bridge converter with current—doubler rectifier(HB-CDR) that satisfies the design indexes is studied. Compared with other kinds of vice-side rectifiers, a conclusion is drew that HB-CDR is especially suitable for a isolated low voltage and high current output DC/DC converter, and a control strategy bines HB-CDR with the half -bridge topology of original side pared. Then the working principle of the HB-CDR and the steady state characteristic of every work mode are analyzed. A controlled source model for the half –bridge converter with HB-CDR is built, so is its small-signal model, which lays the foundation of the closed-loop system.
Finally, a MATLAB simulation based on the th