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1、毕业设计（论文）I基于 TOP225Y 的开关电源摘 要随着电子技术的高速发展，电子系统的应用领域越来越广泛，电子设备的种类也越来越多，电子设备与人们的工作、生活的关系日益密切。任何电子设备都离不开可靠的电源，它们对电源的要求也越来越高。电子设备的小型化和低成本化使电源以轻、薄、小和高效率为发展方向。开关电源因其具有体积小、重量轻、效率高、发热量低、可靠性高、低噪声、节能、安全等众多优点，自 20 世纪 90 年代中期以来便显示出强大的生命力，引起了国内外电源界的普遍关注。目前，开关电源继续朝着短、小、轻、薄、节能、安全的方向发展，涌现出许多开关电源的新技术和新产品。TOPSwitch系列芯片
2、是 Powerlntegration 公司生产的开关电源专用集成电路。它将脉宽调制电路与高压 MOSFET 开关管驱动电路等集成在一起，具备完善的保护功能。本文介绍了开关电源的发展，贴点，分类；利用当今开关电源发展的新技术、新趋势，设计并制作出安全、高效、节能的辅助电源开关电源。本开关电源了TOP225y 等芯片以及其他的电路元件配合，设计出能实现自动稳压功能的单端反激式拓扑辅助电源开关电源。关键词：辅助电源，开关电源，top225y，单端反激毕业设计（论文）IIBASED ON THE TOP225Y SWITCHING POWER SUPPLYABSTRACTAlong with the
3、rapid development of electronic technology, the application of electronic system is more and more extensive, types of electronic equipment, electronic equipment is also more and more people work and life, the relationship is increasingly close. Any electronic equipment are inseparable from the power
4、 supply reliability of power supply, the higher requirements. Electronic equipment miniaturized and low cost of the power to light and thin and small and efficient for development direction. Switching power supply because of its small volume, light weight, high efficiency, low calorific value, high
5、reliability, low noise, energy saving, safety, since many advantages in the mid 1990s has demonstrated the formidable vitality, the power of the worlds attention. At present, switch power, small, move towards light and thin, energy saving, safety and the direction of development, there are lots of s
6、witch power supply of new technology and new products.TOPSwitch series Powerlntegration chip is switch power company produces special integrated circuits. It will pulse width modulation circuit and the high voltage MOSFET switch tube drive circuit integrated together, with perfect protection functio
7、n. The paper introduces the development of switch power supply, stick, classification, Using the current development of switch power supply of new technology and new trends, design and produce safe, efficient, energy-saving auxiliary power switch power supply. The switching power supply for TOP225y
8、chips and PC817A TL431, such chips and other circuit elements, design through rectifier, feedback, filtering, etc. To realize automatic voltage circuit voltage function of single flyback auxiliary power switch power of topology.KEY WORDS: Auxiliary power supply, Switched Mode Power Supply, TOP225Y,
9、Single flyback目 录毕业设计（论文）III前 言.1第一章 绪论.21.1 开关电源的基本概念与特点.21.1.1 开关电源的基本概念.21.1.2 开关电源的特点.21.2 开关电源的发展历史与趋势.31.2.1 开关电源的发展历史.31.2.2 开关电源的发展趋势.31.3 本论文的内容介绍.4第二章 开关电源的基本类型及工作原理.62.1 开关电源的基本类型.62.2 开关电源的原理框图及基本工作原理.92.2.1 开关电源的原理框图.92.2.2 开关电源的工作原理.102.2.3 脉宽调制式开关电源的基本工作原理.102.3 TOPSwitch-系列单片开关电源的工作原
10、理.11第三章 辅助电源通用开关电源的研制.143.1 开关电源的一般设计流程.143.2 技术指标和性能要求.143.3 关键元器件的选择与介绍.143.3.1 TOP225Y 型 3 端单片开关电源.143.3.2 可调式精密并联稳压器 TL431.173.3.3 线性光耦合器 PC817.183.4 开关电源的电路设计.193.4.1 高频变压器的设计.193.4.2 输出滤波电路的设计.213.4.3 反馈电路.223.5 基于 TOP225Y 的开关电源原理图及工作原理.223.5.1 Protel 软件介绍.223.5.2 基于 TOP225Y 的开关电源原理图.233.5.3 基于 TOP225Y 的辅助电源开关电源工作原理的分析毕业设计（论文）IV.233.6 开关电源印制板的设计.263.6.1 PCB 设计的一般原则.263.6.2 PCB 及电路的抗干扰措施.
