基于單片機(jī)的數(shù)控直流穩(wěn)壓源設(shè)計(jì)

論文編號(hào):DZXX385 論文字?jǐn)?shù):11823,頁(yè)數(shù):44

摘要

 單片機(jī)由于體積小，功能齊全、可靠性高，越來越受到人們的關(guān)注. 基于單片機(jī)的電路往往比傳統(tǒng)的電路設(shè)計(jì)具有更大的靈活性。
 隨著時(shí)代的發(fā)展，單片機(jī)技術(shù)已經(jīng)普及到我們生活，工作，科研的各個(gè)領(lǐng)域.由于人們生活水平的提高,傳統(tǒng)的電壓源已經(jīng)不能滿足人們的需求.本文將介紹一種數(shù)控直流穩(wěn)壓電源，同時(shí)分析了數(shù)字技術(shù)和模擬技術(shù)相互轉(zhuǎn)換的概念。
  本系統(tǒng)以直流電流源為基礎(chǔ)，89S52單片機(jī)為主控制器，通過鍵盤來設(shè)置直流電源的輸出電壓，設(shè)置步進(jìn)等級(jí)可達(dá)0.1V，并可由LCD顯示電壓設(shè)定值。本系統(tǒng)由單片機(jī)控制設(shè)定數(shù)字信號(hào)，經(jīng)過D/A轉(zhuǎn)換器（DAC0832）的輸出模擬量，再經(jīng)過運(yùn)算放大器放大，最后通過可調(diào)穩(wěn)壓器LM338輸出電壓。此設(shè)計(jì)用到了數(shù)字技術(shù)中的單片機(jī)，D/A 轉(zhuǎn)換器，LCD顯示等電路，具有控制精度高，制作比較容易等優(yōu)點(diǎn)。
 
關(guān)鍵詞：數(shù)控； 數(shù)模轉(zhuǎn)換； 89S52

Abstract

 MCU because of physical volume small, the function is well-found, the credibility is high, is subjected to the concern by people more and more . The mcu-based circuit than traditional circuit design with greater flexibility.
 With the development of the times, MCU technology has spread to our lives, work, and research in all fields. Along with the life horizontal exaltation, people pursue humanized thing more and more, the traditional power supple has already can't satisfied people's demand .this paper will introduce a digital DC voltage power supply, and analyse the digital technology and simulation technology mutual conversion concept.
  This system take the DC current source for the base ,89S52 for mainly controller, through keyboard to establish the  direct current power supply’s output voltage, install stepping up to 0.1V levels, and the LCD shows the  output voltage and the actual output current. This system programmed by MCU to set digital signals, after D/A converters (DAC0832),  the simulation export volume is sent to the  amplifier. Then through the adjustable voltage regulator LM338 output voltage. The design use the digital technology in MCU, D/A converters, LCD display, and other circuits, It has advantages such as high-precision control and product easily.
Keywords : digital； D/A conversion；89S52

課題的目標(biāo)
實(shí)現(xiàn)電壓0-12V內(nèi)電壓可調(diào);
輸出精度高，步進(jìn)電壓在0.1V左右，并且調(diào)整方便；
輸出最大電流：0.5A以上；
對(duì)電流進(jìn)行監(jiān)控;

目錄
摘要 1
Abstract 2
第1章  緒論 5
1.1課題背景及重要意義 5
1.2課題設(shè)計(jì)的目的及目標(biāo) 6
1.2.1課題的目的 6
1.2.2課題的目標(biāo) 7
第2章 設(shè)計(jì)方案論證 8
2.1  通過改變交流線圈雜數(shù)的實(shí)現(xiàn)方案 8
2.2編碼和存儲(chǔ)器相結(jié)合的實(shí)現(xiàn)方案 9
2.3  MCU和DAC相結(jié)合的實(shí)現(xiàn)方案 10
第3章 系統(tǒng)硬件設(shè)計(jì) 12
3.1 電源設(shè)計(jì) 12
3.2 CPU及外圍電路設(shè)計(jì) 13
3.2.1 AT89S52引腳結(jié)構(gòu) 13
3.2.2時(shí)鐘電路 17
3.2.3復(fù)位電路： 18
3.3數(shù)模轉(zhuǎn)換及電壓輸出設(shè)計(jì) 20
3.4電流測(cè)量設(shè)計(jì) 22
3.5顯示電路設(shè)計(jì) 24
3.6按鍵設(shè)計(jì) 25
3.7 設(shè)計(jì)軟件Protel 99SE簡(jiǎn)介 26
3.7.1 Protel 99SE的特性簡(jiǎn)介 26
3.7.2 Protel 99SE原理圖設(shè)計(jì) 27
3.7.3 Protel 99SE PCB設(shè)計(jì) 28
第4章 系統(tǒng)軟件設(shè)計(jì) 31
4.1 軟件總體流程圖 31
4.2鍵盤掃描子程序 32
4.3解碼和顯示子程序 37
第5章  系統(tǒng)調(diào)試 39
5.1軟件調(diào)試 39
5.2硬件調(diào)試 39
第6章 系統(tǒng)設(shè)計(jì)總結(jié) 41
致謝 42
參考文獻(xiàn) 43
附錄: 英文原文及翻譯 44
高 效 可 編 程 電 源 56