毕业设计(论文)基于单片机的数控电流源设计.doc

基于单片机的数控电流源设计 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ased on SCM of nc source current 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 at89s51 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 dac0832. This article provides nc current source of very high precision, a number of current trials, circuits, refining, simplicity, low cost, or useful value. Developing Keywords：umerical controlled current source; AT89S51; Digital-To- Analog conversion 不要删除行尾的分节符，此行不会被打印目录 摘要 I Abstract II 第1章 绪论 1 1.1 课题背景 1 1.2 技术发展历程 1 1.3 本文的研究目的意义及主要工作 2 1.4 小结 3 第2章 方案设计 4 2.1 方案比较与论证 4 2.1.2系统设计方案选择 4 2.1.2压控恒流源的选择 5 2.1.3显示方案选择 5 2.2 设计方案 6 2.3本章小结 7 第3章 硬件电路设计 8 3.1 电源电路设计 8 3.1.1 TL7660简介 9 3.1.2 电源电路设计 10 3.2 控制电路 10 3.2.1 单片机时钟电路 11 3.2.2 单片机复位电路 12 3.2.3 控制电路设计 13 3.3 D/A转换电路 15 3.4 压控恒流源