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1、摘要在21世纪的社会,随着科学技术的不断发展,电子设备给人们带来极大的便利的,但是所有的电子设备都必须在电源电路的支持下才能正常工作。不同的电子产品在工作时所需要的电源电压不同。通常情况下要求能提供稳定,满足直流电能的电源就是直流稳压电源。目前,各种直流电源的产品充斥着市场,电源技术已经比较成熟。然而,基于成本的考虑,对于电源性能的要求不是很高的场合,可采用过流保护的集成稳压电路,同样能满足产品的需要。基于上述实际意义,设计一串联串联型连续可调直流稳压负电源,其主要是完成在输出最大电流为500m
2、A,稳压洗漱小雨0.05的同时要求电流具有扩展,电路具有过流保护功能的情况下,调节电位器,使输出电压在1.5-10V之间连续可调。经过一系列的分析,准备,通过Multisim仿真软件及实际焊接和调试来。除了在布局和焊接美观方面之外,设计的电路基本符合设计要求。关键词:直流稳压变压过流保护电压可调17目录第一章设计要求················································1第二章方案设计原理及比较······························
3、········22.1设计方案··········································22.2方案比较············································4第三章单元电路分析与设计······································53.1电路设计原理········································53.2单元模块·······························
4、·············53.2.1电源变压器····································53.2.2整流电17路····································53.2.3滤波电路····································63.2.4稳压电路····································7第四章总原理图和仿真图······································
5、··9第五章电路的安装及调试·······································115.1电路的安装············································115.2调试仪器和设备·········································115.3电路的调试············································115.4电路的调试结果分析······················
6、··················11第六章实验结论和实验感悟·······························17······13参考文献························································14附录····························································1517第一章设计要求设计制作一串联型连续可调直流稳压负电源电路1.输出直流电压在1.5-10V可调;2.
7、输出电流Iom=300mA;(有电流扩展功能);3.稳压系数Sr<0.5;4.具有过流保护功能;17第二章方案设计及比较2.1设计方案根据目前所学的知识,主要有以下两种设计方法(1)晶体管串联式直流稳压电路电路框图如图2.1(1)所示的串联型稳压电路,稳压部分有取样电路,基准电路,比较放大和调整电路等部分组成。其中R4,R6和RP组成取样电路,R4,R6和RP为取样电阻;R1和D2组成基准电压电路,放大器是比较放大电路,R2和Q3的作用是限流保护电路,Q1,Q2两个晶体管合起来组成调整管,起调整
8、作用。稳压过程如下:当输出Uo发生变化时,通过取样电路把Uo的变化量取样加到放大管V2的基极。而由R1和Vz组成的基准电路为V2的发射极提供基准电压Uz。由R2,晶体管和放大器组成的放大电路把取样电压和基准电压进行比较放大后,输出调整信号送到调整管的基极,控制调整管进行调整,以维持Uo基本不变。图2.1(1)晶体管串联型稳压电路17(2)采用三端集成稳压器分析设计任务,整流,滤波和稳压是该系统的主要部分。其主要设计思路为:[1]电网供电电压交流220V(有效值)50Hz,要获得低压直流输出,首先
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