QQ客服 官方微博 反馈留言

题名	移相全桥软开关DC/DC变换器的研究; 移相全桥软开关DC/DC变换器的研究
作者	1张先谋,电工研究所
学位类别	硕士
答辩日期	2002
授予单位	中国科学院电工研究所
导师	1李耀华,电工研究所
关键词	DC/DC变换器 移相全桥 零电压开关 平均电流模式 辅助谐振 DC/DC converter phase-shifted FB ZVS average-current mode auxiliary resonance
其他题名	移相全桥软开关DC/DC变换器的研究
学位专业	电力电子与电力传动
中文摘要	该论文研究了以全桥变换器作为主电路拓扑、以移相谐振控制芯片UC3875作为主控芯片、以移相控制方式作为控制方案的移相全桥软开关DC/DC变换器.该变换器的输入电压为24VDC,输出电压为300VDC.高功率密度、高效率和高性能是现代电力电子功率变换器不断追求的目标.从这一点出发,该文从主电路拓扑选择,控制方案确定等方面入手,通过理论分析和仿真计算,设计并制作了该变换器的原理样机.论文选取全桥变换器作为主电路拓扑.全桥变换拓扑优点较多,是高质量、大功率变换的主流拓扑.功率密度的提高必须提高开关频率,这就要求实现开关管的软开关.论文以移相全桥零电压开关（Zero-Voltage-Switched,ZVS）技术取代了传统的双极性硬开关技术,降低了开关管的开关损耗,取得了良好的效果.为了使变换器具有良好的动静态特性,变换器必须实现闭环控制.论文采用了平均电流模式下的双闭环控制,提高了变换器的动态性能和稳态性能.在理论分析的基础上,论文对该变换器进行了仿真研究,设计了该变换器主电路、控制电路和闭环反馈环节的各项参数,并对变换器的各项性能进行了研究.最后论文给出了该变换器原理样机的实验结果. The paper focuses on a 24VDC/300VDC, Phase-Shifted Full-Bridge soft switched DC/DC converter with UC3875 as its kernel controller. High power density as well as high efficiency has always been the goal to pursue in the field of modem electric power converters. To achieve the goal, a converter is designed based on the selection of the main circuit topology and the control method through theoretic analyzing and simulation. Full-Bridge converter is selected as the main circuit topology in this paper. Due to many of its advantages, it has been the mainstream topology adopted in large capacity, high performance power converters. The increase of the power density must be based on quickening the switching frequency, therefore, soft switching is desired. The paper adopts Phase-Shifted Full-Bridge zero-voltage-switched (PS FB ZVS) technology instead of traditional hard switching technology to decrease the switching wastage. It gets good results. There are two disadvantages in the traditional FB PS ZVS DC/DC converter: one is the loss of duty cycle of output voltage of secondary winding is high, the other is it is hard to realize ZVS for the lagging arm in light load condition. The realization of ZVS is at the cost of giving up a moiety of duty cycle, it can reduce but there is no idea to avoid it. The loss of duty cycle is serious in low voltage, high current input condition. It decreases the efficiency of the converter and makes it have no significance to realize ZVS. According to these problems, a saturable inductance and auxiliary resonant circuit is introduced in the paper. The loss of duty cycle is greatly reduced due to the adoption of saturable inductance and auxiliary resonant circuit and the lagging arm can realize ZVS in light load condition due to the adoption of auxiliary resonant circuit. The adoption of saturable inductance and auxiliary resonant circuit resolves the conflict between realizing ZVS in a wide range of load and serious loss of duty cycle in low voltage, high current input condition. It realizes ZVS while reduces the loss of duty cycle nearly to zero and makes the FB PS ZVS technology can be commendably used in this type of DC/DC converters. To achieve a good performance both statically and dynamically, closed loop control method has to be applied. The paper takes advantage of a double closed-loop control method based on average-current mode and improves the static and dynamic performance of the converter. Based on the analyzing of the theory, the parameters of main circuit, control circuit and closed-loop part are designed through simulation. Some performances of the converter are also analyzed in the simulation. Finally, experimental results of the converter are presented and discussed in the paper.
语种	中文
公开日期	2010-10-18
页码	52
内容类型	学位论文
源URL	[http://ir.iee.ac.cn/handle/311042/7247]
专题	电工研究所_其他部门_其他部门_硕士学位论文
推荐引用方式 GB/T 7714	1张先谋,电工研究所. 移相全桥软开关DC/DC变换器的研究, 移相全桥软开关DC/DC变换器的研究[D]. 中国科学院电工研究所. 2002.

个性服务

查看访问统计

相关权益政策

暂无数据

收藏/分享

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。