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1、摘要变频空调由于性能优异、节省能源等特点,逐渐成为各大空调生产企业的发展方向,变频技术也日渐得到各个厂家的重视。变频空调的优点在于高效节能,起动电流小,工作噪音低,温度控制精度高,能够创造更舒适的房间温控环境。同时,采用无刷直流电机作为压缩机,能效比高,使用寿命大大延长。本文从硬件软件两方面着手进行直流变频空调室内、室外系统的综合研究设计,提出了性能指标和功率指标,规划了空调系统的整体框架。空调室外控制系统室外机控制器选用智能功率模块和单片机组成整个系统,用智能功率模块IPM替换分立元件搭成的逆变桥,由CPU独立控制压缩机运
2、行、温度采样、电子膨胀阀驱动、室外机风机调速、四通阀驱动、电压电流采样以及各种保护电路。针对无刷直流压缩机空调选用MOTOROLA公司的M68HC908MR4,带有独立PWM模块,能输出三组互补PWM信号,并有4路中断捕获口,用于转子位置信号捕获,使空调室外控制系统结构简洁、高效、可靠性高。室内机系统以Microchip公司的高档8位单片机PIC18F4550为核心,结合硬件的特点设计而成。使用PIC18F4550单片机的CCP模块功能,实现了遥控器信号的接收以及基于三端双向可控硅TLP3526的PG电机调速;利用单片机的A
3、/D转换模块功能,实现了室内温度和盘管温度的采集。室内机与室外机采用半双工异步通讯,使用了PIC18F4550单片机集成的增强型通用同步/异步收发器(EUSART)模块。保证了室内、外机通讯的准确性。关键词:变频空调,PIC18F4550,M68HC908MR24,通讯.ABSTRACTBecauseoftheexcellentperformanceandtheenergysaving,theinverterair-conditionbecomesthemainleadingproductofmostair-conditio
4、nmanufacturer.Theinvertertechnologyismoreandmorevaluableforeachfactory.Theadvantageofinverterair-conditionliesonthehighefficiency,highprecisionoftemperaturecontrol,lowstartupcurrentandlownoise.Furthermore,usingbrushlessDCmotorasthecompressorcangethighefficiencyandl
5、onglifespan.Thepapertakeshardwaredesignandsoftwaredesignintoaccounttomakethecontrolsystemoftheoutdoorunitandindoorunitoftheinverterair-condition.InthisPaperworksoutitsownfeatureindexandefficiencyindex,andalsodesignthewholeschemeoftheair-conditionsystem.Thecontrolle
6、roftheoutdoorcontrolsystemismadeupofIPMandmicrocomputer.Inthesystem,IPMworksastheinverter.CPUoftheoutdoorunitindependentlycontrolstheworkofthecompressor,thetemperaturesamplingcircuit,thedriverofAandBthrottle,thetimingofoutdoorfan,driverof4-wayvalve,thevoltageandcur
7、rentsamplingcircuit,thecommunicationbetweentheindoorunitandtheoutdoorunit,andsoon.AccordingtothebrushlessDCcompressor,thepaperchoosestheMotorolaCPU,M68HC908MR24,whichhasPWMmodule,canalsoinsertthedead-timeautomatically,andhasfourcaptureinterruptswhichcanbeusedtocapt
8、urethesignalofpositionoftherotor.Duringtheexperiments,thecompressorworkssmoothly,andhasawidespeedspan.Inthedesignofindoor-system,weusePIC18F4550w