多路开关直流稳压电源.doc

本科毕业论文（设计） 关于多路直流稳压电源的研制 系 院：信息工程系 学生姓名：徐文武 学 号：0611120227 专 业：电子信息工程 年 级：2006级 完成日期：2010.5 指导教师：李应生 摘 要 几乎所有电子设备中都需要稳定的直流电源。但是一般的直流稳压电源只能输出一路稳压电源，很浪费且不方便。随着电子技术的讯速发展对电源的要求越来越高。针对老式电源只能输出一路稳压电源的缺点，提出了基于集成稳压器可以输出多路电源的多路稳压电源变压器。 本设计的直流稳压电源是将电网输入的220V的交流电压变成整流电路所需要的电压，再由单相桥式整流电路将交流电压变换成脉动的直流电压，然后由电容滤波器将脉动直流电压滤除纹波，变成纹波小的电压，最后通过稳压器输出稳定电压+5V、+12V、-12、+24V和正可调的直流电压。根据多路稳压电源的设计要求，本课题采用了三端集成稳压器78系列、79系列等设计了一个可固定输出+5V、+12V、-12、+24V并能通过LM317实现输出正可调的直流稳压电源。设计中主要通过硬件来完成其稳压电源的要求，采用模拟的分立元件，通过电源变压器、整流和滤波电路以及稳压电路，实现稳压电源稳定输出+5V、±12V、+24V并能可调输出1.2～24电压。 本课题设计的稳压电源具有成本底，体积小、重量轻、使用方便和工作可靠等优点，被用于各种晶体管仪器、仪表、教学、自动控制系统与设备的直流电源。 关键字：变压器;整流桥;滤波;稳压器 Abstract In the nearly all electronic installation needs the stable direct-current power supply. But the common cocurrent voltage-stabilized source can only output a group voltage-stabilized source, wastes very much, and is not convenient. Is getting higher and higher along with electronic technologys news fast development to power sources request. Can only output a group voltage-stabilized sources shortcoming in view of the old style power source, proposed based on integrates the manostat to be possible to output the multi-channel power sources multi-channel voltage-stabilized source transformers. This designs cocurrent voltage-stabilized source is turns the electrical network input 220V alternating voltage the voltage which the leveling circuit needs, The alternating voltage will transform the pulsation again by the single-phase bridge-type leveling circuit the DC voltage, then by the condenser filter the pulsating direct current voltage filtration ripple, turns the ripple small voltage, finally outputs regulated voltage +5V, +12V through the manostat, - 12, +24V and the adjustable DC voltage According to the multi-channel voltage-stabilized sources design requirements, this topic used three end integration manostat 78 series, 79 series and so on to design one to be possible to output +5v, +12V fixedly, - 12, +24V and ca