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毕业设计论文数控恒流源的设计
35页1、摘 要恒流源,是一种能够向负载提供恒定电流的电源。恒流源的应用范围非常广泛,并且在许多情况下是必不可少的。本文设计了一种基于单片机控制的数控直流恒流源。该恒流源以AT89S52为控制核心,采用了高共模抑制比低温漂的运算放大器OP07和达林顿管TIP122构成恒流源的主体,配以高精度采样电阻及12位D/A芯片MAX532、16位A/D芯片AD7715,完成了单片机对输出电流的实时检测和实时控制。人机接口采用44键盘及LED数码管显示器,控制界面直观、简洁,具有良好的人机交互性能。在软件设计上采用增量式PID控制算法,即数字控制器的输出只是控制量的增量。该系统已基本达到预期的设计目标,具有功能强、性能可靠、体积小、电路简单的特点,可以应用于需要高稳定度的小功率恒流源的领域。关键词:恒流源;AT89S52;PID控制算法;数字控制。 The abstract Constant current, is one kind can provide the constant current to the load the power source.The constant current appli
2、cation scope is extremely widespread, and in many situations is essential.This article has designed one kind the numerical control cocurrent constant current which controls based on the monolithic integrated circuit. This constant current take AT89S52 as the control core, has used operational amplifier OP07 and Darington which Gao Gongmu the rejection ratio low temperature floats manages the TIP122 constitution constant current the main body, matches by the high accuracy sampling resistance and
3、12 D/A chip MAX532, 16 A/D chip AD7715, has completed the monolithic integrated circuit to the output current real-time examination and the real-time control. The man-machine connection uses 44 the keyboard and the LED nixietube monitor, the control interface is direct-viewing, is succinct, has the good man-machine interaction performance.Uses the increase type PID control algorithm in the software design, namely the digital controller output only is controls the quantity the increase.This syste
4、m had achieved basically the anticipated design goal, has the function strongly, the performance reliable, the volume small, the electric circuit simple characteristic, may apply in needs the high stability the low power constant current domain.Key word: Constant current; AT89S52; PID control algorithm; Numerical control. 目录第1章 绪论5第2章 系统的总体设计62.1 设计指标要求62.2 总体方案的选取及系统62.2.1 方案一:62.2.2 方案二:7第3章 系统的硬件设计83.1 单片机的功能介绍83.1.1 主要功能特性:83.1.2 引脚功能说明83.1.3 时钟电路及复位电路113.2 恒流源基本设计原理与实现方法133.2.1 引起稳定电源输出不稳定的
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