开关电源毕业设计论文.doc
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基于TOP225Y的DVD开关电源
摘 要
从开关电源具有功耗小、效率高、稳压范围宽、体积小等突出优点,在通信设备、数控装置、仪器仪表、影音设备、家用电器等电子电路中得到了广泛的应用。按电路的输出稳压控制方式,开关电源可分为脉冲宽度调制(PWM)式、脉冲频率调制(PFM)式和脉冲调频调宽式三种。按触发方式分为自激式和它激式两种。按电路的输出取样方式分为直接输出和间接输出取样。单片开关电源具有单片集成化、最简外围电路、最佳性能指标、能构成无工频变压器开关电源等显著优点。其中美国动力(Power)公司率先研制成功的三端隔离式脉宽调制单片开关电源集成电路,被誉为“顶级开关电源”。其第一代产品以1994年推出的TOP100/200 系列为代表,第二代产品则是1997年问世的TOP Switch-Ⅱ。
TOP Switch器件是一种新型单片开关电源芯片,它除了一般的PWM控制功能外,还集成了自动重启功能,过流、过热保护功能,大功率MOSFET等。本文介绍了TOP Switch系列芯片的工作原理以及设计方法。使用它制作高频开关电源,具有成本低,电路简单,效率高等
本论文介绍了开关电源的发展、特点、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、节能的通用型DVD播放机开关电源。本开关电源采用了TOP225Y型智能控制集成芯片和PC817 A、TL431等专用芯片以及其他的电路元件相配合的方案,设计出通过整流、反馈、滤波、稳压等电路来实现自动稳压功能的单端反激式DVD开关电源。
关键词:开关电源,?脉宽调制? ,误差放大器?,光耦?,反馈
Based on The Top225Y DVD Switching Power Supply
ABSTRACT
Single-chip switching power supply With monolithic integrated,The most simple peripheral circuits,Performance target,Can constitute a non-frequency switching power supply transformers, etc. Significant advantages。The United States power company At the successful development of the world on the first end of the three isolated single-chip pulse-width modulation integrated circuit switching power supply,Hailed as the top switching power supply。Its first generation of products introduced in 1994 as the representative TOP100/200 Series,Second-generation products are available in 1997 of TOP Switch-Ⅱ.
TOP Switch device is a new single-chip switching power supply chip, It apart from the general control of the PWM, but also integrates the automatic restart function, over-current, over-temperature protection features, such as high-power MOSFET。Also integrates the automatic restart function, over-current, over-temperature protection features,Such as high-power MOSFET。
This paper introduced the development, characteristics, classification of Switched Mode Power Supply, According to todays new technologies, new trends of Switched Mode Power Supply, designed and produced a Security, efficient, energy-efficient universal Switched Mode Power Supply o
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