基于AT89C51单片机数控电源

I摘要本文主要论述了一种基于AT89C51单片机为核心控制器的数控直流稳压电源的设计原理和实现方法，其主要由辅助电源、显示电路、控制电路、数模转换电路、稳压电路等部分组成。该系统原理是以AT89C51单片机为控制单元，，以数模转换芯片DAC0809进行转换为模拟信号。辅助电源提供各个芯片、数码管和放大器所需工作电压，显示电路用于显示电源输出电压的大小，输出电压值可通过按键对其进行步进控制（±0.1V），并且在按键长时间按下的时候能连续增加或减小。与传统的稳压电源相比具有操作方便，电源稳定性高以及其输出电压大小采用数码显示的特点。该系统具有抗干扰性能好，可靠性高，及最终输出电压值与真实显示值精确度较高等优点。关键词:数控直流稳压电源AT89C51DAC0809IIDesignofDigitalPowersourceAbstractThemethodofthispaperbasedontheAT89C51microcontrollercoreofthenumericalcontrollerDCpowersupplydesigntheoryandrealization.ThedigitalDCpowersupplyfromtheanalogpower,displaycircuit,controlcircuit,digital-to-analogconversioncircuit,regulatorcircuitandanalog-to-digitalconvertercircuitcomposedofsixparts.Thissystemisbasedontheprincipleofsingle-chipmicrocomputertocontroltheunitAT89C51toDAC0809digital-to-analogconverterchipreferencevoltagetocontroltheoutputvoltage,whiletheanalog-to-digitalconverterdac0809chipconvertthesamplingofvoltagetodigitalsignals.Analogpowersupplytoprovidethevariouschips,digitalamplifiercontrolandtherequiredoperatingvoltage,displaycircuitfordisplayingthesizeofpowersupplyoutputvoltage,outputvoltagevaluemaybesteppingthroughthecontrolbutton(±0.1V),andalongbuttonpresswhenunderthecontinuousincreaseordecrease.Andcomparedtothetraditionalregulatedpowersupplywitheasytooperate,highpowerstability,aswellasthesizeoftheoutputvoltagecharacteristicsoftheuseofdigitaldisplay.Thissystemhastheresistancetointerferencewell,thereliabilityishigh,andfinallyoutputvoltagevalueandrealdemonstrationvalueprecisionhighermerit.Keywords:DigitalDCVoltage-stabilizedPowerSourceAT89C51DAC08091目录摘要...........................................................................................................................................................................IDESIGNOFDIGITALPOWERSOURCE.............................................................................................................IIABSTRACT................................................................................................................................................................II第一章绪论................................................................................................................................................................2第二章电源概述及方案设计.....................................................................................................................................52.1直流稳压源概述及定义...................................................................................................................................52.2方案的比较与选择...........................................................................................................................................52.2.1传统直流稳压源.....................................................................................................................................52.2.2数控直流稳压电源.................................................................................................................................62.2.3方案的最终选择.....................................................................................................................................72.3数控直流稳压电源设计方案及结构....................................................................................................................72.3.1系统总体设计方案.......................................................................................................................................82.3.2数控直流稳压源总体结构...........................................................................................................................8第三章硬件系统设计.................................................................................................................................................93.1控制模块的分析...............................................................................................................................................93.1.1单片机简介..............................................................................................................................................93.1.2AT89C51单片机简介............................................................................................................................113.1.3AT89C51单片机的性能参数：............................................................................................................113.1.4AT89C51内存空间.............................................................................................................................123.1.5AT89C51单片机的功能特性概述......................................................................................................123.1.6AT89C51接口设计................................................................................................................................153.2显示模块.........................................................................................................................................................163.2.1数码显示输出部分................................................................................................................................163.3键盘模块................................