【正文】 長 春 大 學(xué) 基于單片機(jī)的數(shù)控直流電流源設(shè)計 ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ 裝 ┊ ┊ ┊ ┊ ┊ 訂 ┊ ┊ ┊ ┊ ┊ 線 ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ I 基于單片機(jī)的數(shù)控直流電流源的設(shè)計 【摘要】 隨著電子技術(shù)的飛速發(fā)展，電子設(shè)備越來越多，而電子設(shè)備要工作都需要有電源能夠為其通電。性能好的電子設(shè)備，首先就離不開穩(wěn)定的電源，電源的穩(wěn)定度越高，電子設(shè)備機(jī)器外圍條件越優(yōu)越，設(shè)備的壽命就更長。而各種不同的電子設(shè)備所需要的供電電源不是統(tǒng)一的，所以，對于數(shù)控恒定電流源的研究與開發(fā)就顯得相當(dāng)重要了?，F(xiàn)在數(shù)控恒壓技術(shù)已經(jīng)很成熟，但在恒流方面尤其是在數(shù)控恒流方面的技術(shù)還有待發(fā)展，高性能的數(shù)控電流源的研究與開發(fā)非常重要。 本文介紹了一種基于單片機(jī)的數(shù)控電流源的設(shè)計方法，系統(tǒng)以 AT89C52 單片機(jī)為中心控制器，利用按鍵設(shè)置輸出電流，單片機(jī)將該電流值送 1602 液晶屏 顯示，同時，通過與 D/A 轉(zhuǎn)換器的數(shù)據(jù)通信端口將輸出電流的數(shù)字量送入 D/A轉(zhuǎn)換器， D/A 轉(zhuǎn)換器將數(shù)字量轉(zhuǎn)換為為模擬量后輸出，再通 過壓控流電路得到 輸出的電流 ，采樣電路把輸出的電流轉(zhuǎn)換成電壓值送入 AD，經(jīng)轉(zhuǎn)換后把對應(yīng)的數(shù)字量送入單片機(jī)，形成閉環(huán)系統(tǒng) 。 A/D 轉(zhuǎn)換器 采用 MAX1241， D/A 轉(zhuǎn)換器采用 AD5320。 本文提供的數(shù)控電流源具有很高的精度值，可滿足多種電流源的試驗要求，且電路精煉、簡單易懂、成本低廉、實用價值和開發(fā)價值 大。 【 關(guān)鍵字 】 數(shù)控電流源 AT89C52 A/D 轉(zhuǎn)換器 D/A 轉(zhuǎn)換器 Based on SCM control DC current source design 長 春 大 學(xué) 基于單片機(jī)的數(shù)控直流電流源設(shè)計 ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ 裝 ┊ ┊ ┊ ┊ ┊ 訂 ┊ ┊ ┊ ┊ ┊ 線 ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ II 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 AT89C52 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 munications 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 MAX1241 AD5320. 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 Numerical controlled current source AT89C52 Analog To Digital conversion DigitalTo Analog conversion 長 春 大 學(xué) 基于單片機(jī)的數(shù)控直流電流源設(shè)計 ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ 裝 ┊ ┊ ┊ ┊ ┊ 訂 ┊ ┊ ┊ ┊ ┊ 線 ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ i 目錄 第 1 章 概述 ..........................................................................................................................1 設(shè)計要求 ............................................................................................................ 1 理論分析 ............................................................................................................ 1 系統(tǒng)介紹 ............................................................................................................ 1 第 2 章 硬件設(shè)計 ..................................................................................................................3 電源模塊 ............................................................................................................ 3 恒流源模 塊 ........................................................................................................ 5 單片機(jī)模塊 ........................................................................................................ 6 鍵盤模塊 .......................................................................................................... 10 鍵盤電路 .............................................................................................. 11 顯示模塊 .......................................................................................................... 11 1602LCD 顯示 ...................................................................................... 11 LCD 顯示硬件電路 .............................................................................. 12 A/D 模塊 ........................................................................................................... 14 芯片 MAX1241 .................................................................................... 14 A/D 模塊電路 ...................................................................................... 15 D/A 模塊 ........................................................................................................... 16 存儲模塊 .......................................................................................................... 17 2? C 總線 ................................................................................................ 17 芯片 24C02C ....................................................................................... 18 存儲模塊電路 ..................................................................................... 18 第 3 章 軟件設(shè)計 ................................................................................................................23 編程語言描述 .................................................................................................. 23 系統(tǒng)軟件的功能模塊 ...................................................................................... 24 主程序設(shè)計 .......................................................................................... 24 中斷程序設(shè)計 ....................