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摘要：电流源是一种应用非常广泛的电源类器件。但是市面上的可调节的电流源绝大多数都是旋钮式设计。通过旋钮式调节会影响电流源输出的精度。而且有时会出现一个非常严重的问题，那就是电流输出不稳定，会发生电流骤变现象。这样电流源使用起来很不方便。数控电流源具备了操作简便，电流输出稳定性高等特点。非常适合作为电子行业的供电源。本设计最核心的控制芯片采用了STC89C52单片机，预计输出的电流值可以从设计的键盘上输入。众所周知，数模转换器的作用是将数字信号转换成模拟信号。我们可以利用这个特性将参考电流转换之后再输出。本数控电流源设计的预期输出电流范围为0-1安培。最低调节可按10毫安递增或者递减。电流源输出的电流值是通过液晶LCD1602显示的。本设计硬件布局合理，设计也较为简洁，能达到一般使用的精度标准。39905
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毕业论文关键词：STC89C52 数控电流源 LCD。
NC current source based on MCU
Abstract: Current source is a very extensive power class devices. However, the current source of the vast majority of the market is adjustable knob design. By adjusting the knob will affect the accuracy of the current source output. And sometimes there will be a very serious problem, and that is the current output is unstable, the current sudden change may occur. Thus the current source very easy to use. Digitally controlled current source with a simple operation, and high current output stability. Very suitable for the power electronics industry. The design of the core control chip microcontroller with a STC89C52, expected output current value can be entered from the design of the keyboard. As we all know, the role of the DAC converts the digital signal into an analog signal. We can use this feature to re-export after the reference current conversion. Expected output current range of the digitally controlled current source designed for 0-1 amps. Lowest adjusted according to 10 mA increments or decrements. The current value of the current source output is displayed by the liquid crystal LCD1602. The hardware design rational layout, design is relatively simple and can achieve accuracy standards are generally used.
Keywords：LCD Current Source MCU
目录
1绪论 1
1.1 引言 1
1.2研究概况及发展趋势 2
1.3 本系统主要设计研究内容 3
2. 总体方案论证与设计 4
2.1总体方案论述 4
2.2显示方案选择 4
2.3供电电源方案选择 4
2.4系统整体设计概述 5
3.系统硬件电路设计 6
3.1主控模块 6
3.1.1 STC89C52单片机主要特性 6
3.1.2 STC89C52单片机引脚图 7
3.1.4 STC89C52单片机的定时/计数器 9
3.2 LCD液晶显示器简介 9
3.2.1 液晶原理介绍 9
3.2.2液晶模块简介 10
3.2.3液晶显示部分与STC89C52的接口 11
3.3 DA模块设计 12
3.3.1 TLC5615芯片介绍 12
3.4扩流模块设计 13
3.5按键模块设计 13
3.6电源模块设计 14
4.系统软件设计 16
4.1系统软件总体设计 16
4.2程序设计原理 16
5.系统调试 18
5.1硬件 18
5.2软件 18
5.3调试结果 18
6.结论 20
致谢 21
参考文献 22