可编程电源直流电源设计.docxVIP

可编程直流电源课程设计姓名：学号：班级：摘 要本次工程设计对一个可编程直流电源系统进行设计与实现。通过整流滤波电路对电流进行处理，输出的直流电压不稳定，再通过稳压电路采用三端稳压器LM317与采样电阻组成的输出电压可调的稳压电路，在三端稳压器的调整端加晶体三极管9013作为电子开关，通过译码器74LS138对74LS161的计数输出进行译码，利用输出电平信号控制晶体三极管的工作状态，从而达到接通不同反馈电阻的要求。另外，利用译码器4511与数码管组成显示电路，显示当前输出电压的状态。关键词：LM317；晶体三极管9013；译码器4511AbstractThis paper introduces the design can be programmed and dc power supply system.Through the rectifier filter circuit of current processing, the output of the dc voltage instability, again through the voltage regulator circuit using three-terminal regulator LM317 and sampling resistance of output voltage adjustable voltage regulator circuit, in three end voltage regulator adjustment end and crystal triode 9013 as electronic switch, through the decoder ls138 74 to 74 ls161 count output decoding, using the output level signal control crystal triode working condition, in order to connect different feedback resistance requirements. In addition, the use of decoder 4511 with digital tube display circuit, display the current of the output voltage of the state. Key words: LM317;transistor9013;translator4511目 录第一部分 系统设计-------------------------------------------------61.1 设计题目及要求 ---------------------------------------------61.2 总体设计方案------------------------------------------------6第二部分 单元电路设计---------------------------------------------7整流滤波电路------------------------------------------------72.1.1 电路形式-----------------------------------------------82.1.2 单元电路图---------------------------------------------82.1.3 功能与工作原理-----------------------------------------82.1.4 参数计算-----------------------------------------------82.2 程序控制稳压电路--------------------------------------------92.2.1 电路形式----------------------------------------------9 2.2.2 单元电路图----------------------------------------92.2.3功能与工作原理-----------------------------------------102.2.4 参数计算-------------------------------------------102.3 IC辅助电源-------------------------------------------------10 2.3.1 电路形式------------------------