【正文】 ............... 方案比較與論證 ............................................................................................. 系統(tǒng)設(shè)計(jì)方案選擇 ..................................................................................... 壓控恒流源的選擇 ..................................................................................... 顯示方案選擇 ............................................................................................ 總體設(shè)計(jì) 方案 ................................................................................................. 本章小結(jié) ......................................................................................................... 第 3 章 硬件電路設(shè)計(jì) ....................................................... 電源電路設(shè)計(jì) ................................................................................................. TL7660簡(jiǎn)介 .............................................................................................. 電源電路設(shè)計(jì) ........................................................................................... 控制電路 ........................................................................................................ 單片機(jī)時(shí)鐘電路 ....................................................................................... 單片機(jī)復(fù)位電路 ....................................................................................... 控制電路設(shè)計(jì) ........................................................................................... D/A轉(zhuǎn)換電路 .................................................................................................. 壓控恒流源電路 ............................................................................................. LM324 簡(jiǎn)介 .............................................................................................. 壓控恒流源電路設(shè)計(jì) ................................................................................. 顯示電路 ........................................................................................................ 74LS164簡(jiǎn)介 ............................................................................................ 顯示電路設(shè)計(jì) ........................................................................................... 本章小結(jié) ........................................................................................................ 第 4 章 軟件程序設(shè)計(jì) ....................................................... 主程序設(shè)計(jì)流程 ............................................................................................. 程序設(shè)計(jì) ........................................................................................................ 本章總結(jié) ........................................................................................................ 結(jié)論 .................................................................................... 致謝 .................................................................................... 參考文獻(xiàn) ............................................................................ 附錄 A 基于 AT89S51 單片機(jī)的電路原理圖 .................... 附錄 B 基于 AT89S51 單片機(jī)的源程序 ............................ 摘要 隨著電子技術(shù)的飛速發(fā)展，電子設(shè)備越來(lái)越多，而電子設(shè)備要工作都需要有電源能夠?yàn)槠渫姟，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(kāi)發(fā)非常重要。 關(guān)鍵字： 數(shù)控電流源， STC89C51， D/A轉(zhuǎn)換器 Abstract As electronic technology in recent years, electronic devices and electronic equipment work will need to have the power of electricity. the perform a numerical controlled 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 Numerical controlled constant current research and development is very important. it is a constant pressure numerical controlled technology have a ripe, constant flow in the field, especially at a constant stream numerical controlled skills to development, perform a numerical controlled numerical controlled current research and development is very important .This article describes a revivification of numerical controlled current design methods and systems to at89s51 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 article provides numerical controlled 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。電力電子技術(shù)是電能的最佳應(yīng)用技術(shù)之一。在一些工業(yè)場(chǎng)合需要提供電壓源和電流源，而且要求范圍廣，紋波低?；诖?，人們 對(duì)數(shù)控恒定電流器件的需求越來(lái)越迫切 ．當(dāng)今社會(huì)，數(shù)控恒壓技術(shù)已經(jīng)很成熟，但是恒流方面特別是數(shù)控恒流的技術(shù)才剛剛起步有待發(fā)展，高性能的數(shù)控恒流器件的開(kāi)發(fā)和應(yīng)用