【精品】基于单片机的数控直流电流源的设计毕业论文.doc

基于单片机的数控直流电流源的设计 【摘要】 随着电子技术的飞速发展，电子设备越来越多，而电子设备要工作都需要有电源能够为其通电。性能好的电子设备，首先就离不开稳定的电源，电源的稳定度越高，电子设备机器外围条件越优越，设备的寿命就更长。而各种不同的电子设备所需要的供电电源不是统一的，所以，对于数控恒定电流源的研究与开发就显得相当重要了。现在数控恒压技术已经很成熟，但在恒流方面尤其是在数控恒流方面的技术还有待发展，高性能的数控电流源的研究与开发非常重要。 本文介绍了一种基于单片机的数控电流源的设计方法，系统以AT89C52单片机为中心控制器，利用按键设置输出电流，单片机将该电流值送1602液晶屏显示，同时，通过与D/A转换器的数据通信端口将输出电流的数字量送入D/A转换器，D/A转换器将数字量转换为为模拟量后输出，再通过压控流电路得到输出的电流，采样电路把输出的电流转换成电压值送入AD，经转换后把对应的数字量送入单片机，形成闭环系统。A/D转换器采用MAX1241，D/A转换器采用AD5320。 本文提供的数控电流源具有很高的精度值，可满足多种电流源的试验要求，且电路精炼、简单易懂、成本低廉、实用价值和开发价值大。 【关键字】 数控电流源 AT89C52 A/D转换器 D/A转换器 Based on SCM control DC current source design Abstract As electronic technology in recent years, electronic devices and electronic equipment work will need to have the power of electricity. the performance of electronic equipment is first and foremost from a stable source of stability, the higher the external condition, an electronic device, machine equipment of the more, it will be long. And a variety of electronic equipment needed the supply of power is not unified, so for nc constant current research and development is very important. it is a constant pressure nc technology have a ripe, constant flow in the field, especially at a constant stream nc skills to development, performance nc current research and development is very important. This article describes a revivification of nc current design methods and systems to AT89C52 monolithic integrated circuits to control, the button for the output, the current monolithic integrated circuits current take the tube, At the same time, and d a converter data communications port output of the current number of tier d a converter, d a converter will be converted to numbers measure for simulating after the output, run by a constant flow of electrical a steady output of electricity. d a converter adopt MAX1241 AD5320. This article provides nc current source of very high precision, a number of current trials, circuits, refining, simplicity, low cost, or useful value. Developing Key