摘要：论文首先介绍了开关电源在现代社会生产和生活中的重要作用及发展情况，并阐述了研究和开发半桥变换器的重要意义。接着，对半桥变换器的理论进行了阐述和分析。给出了开关技术发展过程和开关电源技术概述，并且分析了几种主要的拓扑结构并进行对比，最后选择了半桥作为本课题采用的主电路结构。然后，详细分析了半桥拓扑工作原理，详细介绍了一个开关工作周期内各个状态量的变化情况，并给出了稳态工作时电路参数。在半桥拓扑工作原理的基础上，对控制电路进行分析。本文介绍的是一款基于PWM技术并使用SG3525芯片半桥式开关稳压电源，其输入电压为单相180～260V，输入交流电频率为50Hz，输出电压为直流15V，最大电流10A。具有体积小、成本低、重量轻等特点。本次设计给出了高频变压器、SG3525芯片结构图、PWM 控制电路的设计方法，驱动电路的设计方法并给出了结果仿真图。52113

毕业论文关键词：半桥变换器；开关电源；稳压电源；

Abstract: This paper first introduces the switching power supply in the production and life in modern society and the important role of the development, the most important and described the research and development of an asymmetrical half bridge converter. Then, has analyzed the asymmetrical half bridge converter theory. Presents a summary of technical development and switching process of switching power supply technology, and the topological structure of several major analyzed and compared, the final choice of the asymmetrical half bridge as the main circuit structure of the. Then, a detailed analysis of the working principle of the asymmetrical half bridge topology, introduces in detail the changes in each state of a switch operating period, and gives the steady-state work circuit parameters and optimized. Based on the working principle of the asymmetrical half bridge topology, analysis of the AC small signal model, the control circuit analysis. This is a PWM based SG3525 chip technology and the use of half bridge switching mode power supply, the input voltage of single-phase 180～260V, input AC frequency is 50HZ, output voltage DC 15V, maximum current 10A. Has the characteristics of small volume, low cost, light weight etc.. The design of the high frequency transformer, SG3525 chip structure diagram, PWM control circuit design, driving circuit design method and the results of simulation graph.

Keywords: half bridge converter; switching power supply; power supply;

 目   录  

1 绪论 5

1.1 课题研究背景 5

1.2 课题研究内容 5

2 半桥拓扑结构选取及工作原理 6

2.1 开关电源技术概括 6

2.2  主要拓扑及工作原理 6

2.4 半桥式开关电源框架图 9

3 半桥式开关电源主电路设计 10

3.1 主电路工作原理 10

3.2 主电路模块的参数设计 11

4 控制电路、驱动电路设计 13

4.1控制电路工作原理 13

4.2控制线路参数设计 14

4.3驱动电路设计 15

5 实验结果 16

结论 17

参考文献 18

致谢 19

1 绪论