降压型pwmacdc开关电源设计.doc

I 电力电子技术课程设计院系: 专业: 名字: 学号: 摘要电源半导体产品近期呈现快速增长趋势,甚至超过了数字处理器和存储器等半导体的增长速度。大部分增长来源于高容量电池供电的电子产品,如手机和数字音乐播放器。由于所有电子产品都需要有电源供电,所以电源管理技术变得至关重要。在这样的前提下,设计开发高效率、高频、小体积的 DC-DC 开关电源芯片,无论是从经济角度,还是从科学研究上来讲都是很有价值的。本文对开关电源的发展历史、当下发展状况以及将来的发展趋势作了简要的介绍,随后阐述了降压型 AC-DC 开关电源的核心部分—— DC-DC 转换器(降压斩波电路)的拓扑结构及其工作原理,描述了 DC-DC 转换器的控制方法——脉宽调制控制( PWM )。在此基础上设计了一款基于电压控制模式的 PWM 降压型 AC-D C 开关电源,设计的内容包括主电路的设计、控制及驱动电路的设计、保护电路的设计以及各个部分的电路设计图,并给出设计参数。 Power semiconductor product recent presents the fast growth trend, even more than the digital processor and memory, etc Semiconductor growth. Most of the es from the high capacity battery power supply of electronic products, such as cell phones and number Word music player. Because all electronic products need to have power supply, so the power management technology to e Closes importantly. In this premise, the design and development of high efficiency and high frequency, small volume of DC-switch power supply, whether DC chip from economic Angle, or from scientific research, are of great value. In this paper, the development history of switch power supply, the present development situation and future development trend are introduced, then expounds the buck type AC-DC switch power supply, the core of DC-DC converter (step-down chopper) the topological structure of and work principle, describes the DC-DC converter control method, the pulse width modulation (PWM) control. On the basis of the design of voltage control mode based on the PWM step-down type AC-DC switch power supply, the content of the design including the main circuit design, control and power circuit design, protection circuit design and each part of the circuit design, and gives the design parameters. 目录 ...................................................................................................... 1 开关电源的概念............................................................................ 1 PWM 技术简介...................................................................... 1 .