基于proteus的数控恒流源的仿真研究

摘要

随着电子技术的发展、数字电路应用领域的扩展，人们对数控恒定电流器件的需求越来越高。应社会发展的需求，对基于单片机控制的“数控恒流电流源”进行研究论证，并运用Proteus软件进行仿真。设计由两大模块组成：①单片机应用系统模块；②大功率压控电流源模块。设计采用AT89C52单片机应用系统，由TLC2543对精密电阻康铜丝的电压进行监控，由LTC1456直接控制输出电压，单片机、A/D、D/A三者组成控制系统，形成闭环回路，保持恒流。电流源采用4×4矩阵键盘进行设定，并采用LCD显示界面。运用Proteus软件仿真，实现输出电流范围为200mA~2000mA，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，AT89C52，LCD显示，Proteus

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: ①SCM application system module; ②superpower voltage controls current power module. This design adopts AT89C52 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 4×4 matrix keyboard to set and LCD display interface. Applying Proteus simulation software to realizing the range of output current as 200mA~2000mA satisfies stepping 10mA, the error's absolute value ≤ 1% +10mA and displaying set-value, simulation values, load voltage value and load load resistance value of current simultaneously.

Keywords:current source ,manostat ,AT89C52,LCD display，Proteus

目录

摘要.................................................................................................................... I ABSTRACT ......................................................................................................... II 第1章总体方案设计.................................................................................. - 5 -

1.1 设计任务 ................................................................................................................ - 5 -

1.2 设计思路 (1)

1.3 总体方案的比较与论证 ........................................................................................ - 5 -第2章硬件模块的设计.. (3)

2.1 稳压电源电路的设计 (3)

2.2 恒流源电路的设计 (4)

2.3 负载电压、电流电路的设计 (5)

2.4 A/D、D/A转换器模块 (6)

2.4.1 D/A转换器 (6)

2.4.2 A.D转换器 (7)

2.4.3 D/A、A/D连接电路 (7)

2.5 AT89C52控制模块 (8)

2.5.1 AT89C52的引脚及其功能介绍 (8)

2.5.2 AT89C52连接电路 (9)

2.6 键盘的硬件设计 (10)

2.7 显示的硬件设计 (11)

第3章软件设计 (12)

3.1 程序说明 (12)

3.2 程序流程图 (13)

第4章系统仿真及数据分析 (14)

4.1 系统仿真方法 (14)

4.2 系统仿真数据 (15)

4.2.1 输出电流范围仿真 (15)

4.2.2 步进调整仿真 (15)

4.2.3 输出电流仿真 (15)

4.3 仿真结果与误差分析 (16)

结论 (18)

参考文献 (19)