基于单片机仿真的数控直流电流源设计毕业设计(编辑修改稿)

基于单片机仿真的数控直流电流源设计毕业设计(编辑修改稿)内容摘要：

实现输出电流范围为 200mA~2020mA，满足步进 10mA，误差的绝对值 ≤ 1% +10mA，可以同时显示电流的给定值、仿真测试值、负载电压值、负载电阻值。 关键词 ：电流源； 稳压电源 ； AT89S52； LCD 显示； Proteus II ABSTRACT The requiements of numerical controlling constant current devices is increasing as development of electronic technology and expanding of digital circuit applicational field. As to satisfy society development, do a study based on numerical controlling constant current power of SCM controlling and apply Proteus to simulating software. This design includes two module: ① SCM application system module。 ② superpower voltage controls current power module. This design adopts AT89S52 SCM application system, monitoried by precision resistance constantan wire voltage corresponding of TLC2543 and controlled and putout voltage directly by LTC1456, which three aspects consist of controlling system and being closed loop circuit to keep constant cuurent. Current souce adopts 44 matrix keyboard to set and LCD display interface. Applying Proteus simulation software to realizing the range of output current as 200mA~2020mA satisfies stepping 10mA, the error39。 s absolute value ≤ 1% +10mA and displaying setvalue, simulation values, load voltage value and load load resistance value of current simultaneously Key words Current source； Manostat ； AT89S52； LCD display； Proteus III 目 录 1 前言 ...................................................................................................................................... 1 数控直流电流源的发展现状 ..................................................................................... 1 数控直流电流源的研究意义 ..................................................................................... 2 该研究解决的主要内容 ............................................................................................. 2 2 设计任务及要求 .................................................................................................................. 4 设计任务 ..................................................................................................................... 4 发挥部分 ..................................................................................................................... 4 设计思路 ..................................................................................................................... 4 方案论证 ..................................................................................................................... 4 总体方案设计 ............................................................................................................. 6 3 硬件系统的设计 .................................................................................................................. 7 硬件系统的模块 ......................................................................................................... 7 单片机最小系统 ............................................................................................ 7 自制电源模块 ................................................................................................ 9 显示模块 ...................................................................................................... 10 键盘模块 ...................................................................................................... 12 电流源模块 .................................................................................................. 13 负载模块 ...................................................................................................... 14 D/A、 A/D 转换模块 ................................................................................... 15 系统的原理图 ........................................................................................................... 17 4 软件系统的设计 ................................................................................................................ 18 单片机资源使用情况 ............................................................................................... 18 软件系统的模块 ....................................................................................................... 18 定时模块 ...................................................................................................... 18 按键操作模块 .............................................................................................. 18 D/A 转换模块 .............................................................................................. 19 A/D 转换模块 .............................................................................................. 19 LCD 显示模块 ............................................................................................. 19 程序流程图 ............................................................................................................... 19 主控制流程图 .............................................................................................. 19 按键操作流程图 .......................................................................................... 20 D/A 转换、 A/D 转换流程图 ...................................................................... 21 IV 数制转换流程图 .......................................................................................... 22 LCD 显示流程图 ......................................................................................... 22 程序清单 ................................................................................................................... 23 5 仿真测试及结果 ................................................................................................................ 24 设计结论及使用方法 ............................................................................................... 24 仿真结果 ................................................................................................................... 24 输出电流范围仿真 ...................................................................................... 24。