基于AT89C51單片機(jī)的數(shù)字直流電流表的設(shè)計(jì)

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摘要

傳統(tǒng)電流測量一般采用電流表和萬用表,但隨著嵌入式技術(shù)與傳感器技術(shù)的發(fā)展數(shù)字電流測量實(shí)用日益廣。本論文描述了交直流數(shù)字電流測量系統(tǒng)的設(shè)計(jì)系統(tǒng)包括微控制器最小系統(tǒng)模塊、電流采集模塊、AD轉(zhuǎn)換模塊、顯示模塊、電源管理模塊等。通過輸入電路把交、直流模擬信號送給ADC0809轉(zhuǎn)換為數(shù)字信號再送至AT89C52單片機(jī),通過P0口經(jīng)LCD1602顯示出測量值,其中交流信號通過單向橋式整流電路將交流信號轉(zhuǎn)換成直流信號在通過ADC0809轉(zhuǎn)換器。論文還詳細(xì)闡述了與系統(tǒng)硬件相應(yīng)的系統(tǒng)軟件設(shè)計(jì)。本系統(tǒng)經(jīng)測試運(yùn)行良好具有一定的實(shí)用價(jià)值和推廣價(jià)值。

關(guān)鍵字：單片機(jī)，數(shù)字電流表，A/D

I

Abstract

Thetraditionalcurrentmeasurementgenerallyusetheammeterandmultimeter,butwiththedevelopmentofembeddedtechnologyandsensortechnology,digitalcurrentmeasurementutilityisincreasinglywidespread.ThispaperdescribesthedesignoftheDCanddigitalcurrentmeasurementsystem,thesystemincludingtheminimumsystemmoduleofthemicrocontroller,thecurrentacquisitionmodules,ADconvertermodule,displaymodule,thepowermanagementmodule.ThroughtheinputcircuitACandDCanalogsignalissenttotheADC0809intodigitalsignalsandthensenttotheAT89C52microcontroller,theLCD1602displaythemeasuredvaluethroughtheP0port;ACsignalthroughtheone-waybridgerectifiercircuitoftheACsignalintoaDCsignalbytheADC0808converter.Thepaperalsoelaboratesthecorrespondingsystemsoftwaredesignandsystemhardware.Thissystemhasbeentestedandrunswell,hassomepracticalvalueandpromotionalvalue.

Keywords:single-chip,digitalammeter,A/D,rectifiercircui

II

目錄

1緒論1

1.1課題研究問題11.2課題背景及意義12背景知識介紹3

2.1單片機(jī)發(fā)展詳細(xì)介紹3

2.1.1單片機(jī)的工作原理42.1.2單片機(jī)的基本特點(diǎn)42.2A/D轉(zhuǎn)換器的介紹52.3A/D轉(zhuǎn)換器的工作原理52.4A/D轉(zhuǎn)換器的基本特點(diǎn)73系統(tǒng)硬件設(shè)計(jì)8

3.1系統(tǒng)整體設(shè)計(jì)方案83.2主控制器模塊設(shè)計(jì)8

3.2.1主控制器的選擇83.2.2AT89C52103.2.3AT89C52最小系統(tǒng)113.3轉(zhuǎn)換模塊設(shè)計(jì)11

3.3.1A/D轉(zhuǎn)換器的選擇113.3.2ADC0809113.3.3ADC0809轉(zhuǎn)換電路123.4數(shù)據(jù)采集模塊的設(shè)計(jì)13

3.4.1直流電流采集電路133.4.2交流電流采集電路一133.4.3交流電流采集電路二133.5顯示模塊設(shè)計(jì)144系統(tǒng)軟件設(shè)計(jì)