【正文】 廣西理工職業(yè)技術(shù)學(xué)院畢業(yè)設(shè)計（論文） 1 廣西理工職業(yè)技術(shù)學(xué)院 畢業(yè)設(shè)計（論文） 題 目： 簡易數(shù)控電源 系 別： 電氣工程系 專業(yè)班級： 11 機電 3 班 姓 名： X X X 學(xué) 號： 20204077 指導(dǎo)教師： X X 二〇一三年 八月 二十日 廣西理工職業(yè)技術(shù)學(xué)院畢業(yè)設(shè)計（論文） 2 摘要 ： 數(shù)控直流穩(wěn)壓源就是能用數(shù)字來控制電源輸出電壓的大小，而且能使輸出的直流電壓能保持穩(wěn)定、精確的直流電壓源；本文介紹了利用數(shù) /模轉(zhuǎn)換電路、輔助電源電路、去抖電路等組成的數(shù)控直流穩(wěn)壓電源電路，詳述了電源的基本電路結(jié)構(gòu)和控制策略；它與傳統(tǒng)的穩(wěn)壓電源相比，具有操作方便、電壓穩(wěn)定度高的特點，其結(jié)構(gòu)簡單、制作方便、成本低，輸出電壓在 1～ 15V之間連續(xù)可調(diào)，其輸出電壓大小以 步進，輸出電壓的大小調(diào)節(jié)是通過“＋” “－”兩鍵操作的，而且可根據(jù)實際要求組成具有不同輸出 電壓值的穩(wěn)壓源電路。該電源控制電路選用 89C51 單片機控制主電路采用串聯(lián)調(diào)整穩(wěn)壓技術(shù)具有線路簡單、響應(yīng)迅速、穩(wěn)定性好、效率高等特點。最后對文章進行了 總結(jié)、致謝、參考文獻 文章最后對數(shù)控直流電源的主要性能參數(shù)進行了測定和總結(jié)，并對其發(fā)展前景進行了展望。 關(guān)鍵詞 ： 單 片機 （ MCU)； 數(shù)模轉(zhuǎn)換器 DAC； 穩(wěn)壓輸出 廣西理工職業(yè)技術(shù)學(xué)院畢業(yè)設(shè)計（論文） 3 Abstract: Numerical control DC voltage source is to use numbers to control the output voltage, DC voltage source and the output DC voltage to remain stable, accurate。 this paper describes the use of CNC digital / analog conversion circuit, auxiliary power circuit, debounce circuit of direct current voltage stabilized power supply circuit, introduces the basic circuit the structure and control strategy of power supply。 pared with the traditional manostat, has the advantages of convenient operation, high voltage stability characteristics, which has the advantages of simple structure, convenient manufacture, low cost, the output voltage is adjustable continuously between 1 ~ 15V, its output voltage to step, the size of the output voltage is regulated by + two key operation, and according to the actual requirements of voltage source circuit is posed of different output voltage. The power control circuit adopts 89C51 singlechip control of the main circuit adopts serial voltage regulate technology has the advantages of simple circuit, quick response, good stability, high efficiency. Finally, the article summarized, acknowledgements, references at the end of this paper, main performance parameters of the numerical control DC power supply are studied and summarized, and its development prospect. Keywords: single chip microputer (MCU)。 digital to analog converter。 voltage output DAC。 廣西理工職業(yè)技術(shù)學(xué)院畢業(yè)設(shè)計（論文） 4 目錄 前言 ............................................................................. 5 ...........................................................................................................5 ...........................................................................................................6 課題的主要內(nèi)容 ...........................................................................................................7 ...........................................................................................................8 2設(shè)計任務(wù)及要求 .................................................................. 8 ...........................................................................................................8 AT89C51單片機 ........................................................................................ 10 AT89C51 簡 介 .................................................................................................. 10 ............................................................................................................ 11 AT89C51接口設(shè)計 .............................................................................................. 11 .................................................................................................................... 11 .................................................................................................. 11 端可調(diào)穩(wěn)壓器 ......................................................................................................... 12 lm358 ....................................................................................................... 13 ............................................................................................................ 13 ............................................................................................................. 14 3. 系統(tǒng)電路原理及硬件實現(xiàn) ........................................................ 15 ............................................................................................................. 15 系統(tǒng)模塊電路設(shè)計 ..................................................................................................... 15 單片機控制模塊 ................................................................................................. 15 穩(wěn)壓 輸出 模塊 （ lm317） ..................................................................................... 16 數(shù)模轉(zhuǎn)換部分 ..................................................................................................... 17 顯示模塊 ............................................................................................................ 18 ............................................................................................................ 19 鍵盤模塊 ................................................................................................................... 19 .................................................................................................. 20 ................................................................. 20 件設(shè)計思路 ................................................................................................................ 20 系統(tǒng)軟件流程 ............................................................................................................ 20 ............................................................. 21 .................................................................................................................... 21 ..........