半桥式DC-DC变换器设计

半桥式DC-DC变换器设计

【摘要】近年来，随着电力电子器件、控制理论的发展和人们对电源性能要求的提高，电力电子技术引起了学者们的广泛关注。目前一些发达国家正逐渐把电力变换技术广泛应用于民用工业领域，我国在这一领域的研究起步较晚，但随着国民经济的发展，适合于不同要求的各种变换器越来越引起科研人员的关注。本文通过对Buck变换器的电路结构和工作原理进行分析，设计出一种半桥式DC-DC变换器，并采用闭环控制方法，将恒定的400V直流输入变为稳定5V的直流输出，保证了系统的供电性能。最后利用Matlab工具对所设计的电路进行仿真,仿真结果验证了所设计系统的有效性。半桥式DC-DC变换器由于电路结构简单，功率器件少且功率管上受到的电压应力小，在中小功率场合得到了较为广泛的应用。本文为进一步研究和开发相关产品提供借鉴。【关键词】Buck 半桥 DC-DC MATLAB

【ABSTRACT】In recent years, with the development of power electronic devices，control theory and the increasing demand of high-quality power supply, power electronics technology has aroused widely attention from scholars. Power electronics technology is used gradually in civilian industrial areas in some developed countries. With the national economic development, the various converters for different requirements are developed and the related technology is studied by scientist and scholar. In this paper, the Buck circuit structure and working principle are analyzed and a half-bridge DC-DC converter is designed. The designed converter uses closed loop control scheme and realized the function that the power form is converted from 400 V DC voltage to 5 V DC voltage. The output voltage is stable and the performance of the designed converter is ensured. Simulation study was carried out and effectiveness of the designed converter is verified by simulation results.【Key words】Buck half-bridge DC-DC MATLAB

目 录

TOC \o "1-3" \h \u HYPERLINK \l _Toc6997 1 绪 论 PAGEREF _Toc6997 1 HYPERLINK \l _Toc11292 1.1 研究背景 PAGEREF _Toc11292 1 HYPERLINK \l _Toc29505 1.2 变换器简介 PAGEREF _Toc29505 2 HYPERLINK \l _Toc20506 1.3 本文研究的内容 PAGEREF _Toc20506 3 HYPERLINK \l _Toc1702 2半桥式DC-DC变换器的工作原理 PAGEREF _Toc1702 4 HYPERLINK \l _Toc4075 2.1半桥式DC-DC变换器的基本电路图及工作原理 PAGEREF _Toc4075 4 HYPERLINK \l _Toc28879 2.2 Buck变换器 PAGEREF _Toc28879 6 HYPERLINK \l _Toc3516 2.2.1 线路组成 PAGEREF _Toc3516 6 HYPERLINK \l _Toc5909 2.2.2 工作原理 PAGEREF _Toc5909