基于单片机的多功能电表设计毕业设计.doc

(此文档为word格式，下载后您可任意编辑修改！) 毕业设计（论文）报告 题 目 基于单片机的多功能电表设计 系 别 专 业 班 级 学生姓名 学 号 指导教师  2013年 4 月 摘要 随着物质生活的富裕，很多人搬入城市，电量成为大家生活的1部分。我们以FM33078单片机为核心，对8户居民的用电量进行测量，让大家了解什么如何利用单片机来测量电量。8路脉冲输出电能计量芯片AD7755能够把居民的用电量转换为一定数量的脉冲。74HC164串入并出8位移位寄存器和LED显示器能够实时循环显示8户居民的用电量。AT24C16通过I2C总线和单片机连接，单片机将居民的用电量实时写入AT24C16当断电时AT24C16仍能保存数据，再次上电后单片机将其保存的数据读出从而实现掉电保护。电能表通过RS-485总线与抄表集中器相连，接收抄表集中器下达的抄表，或预付费、清零等命令。抄表集中器内有GPRS通信模块，MC5，通过GPRS通信网与中心计算机联系，实现数据的上传或命令的下达。 工作时，电压经电阻的分压、电流经电流互感器在取样电阻上取样后，送入专用电能芯片进行处理，并转化为数字信号送到CPU进行计算。由于采用了专用的电能处理芯片，使得电压电流采样分辨率大为提高，且有足够的时间来更加精确的测量电能，从而使电能表的计量准确度有了显著改善。CPU用于分时计费和处理各种输入输出数据，通过串行接口将专用电能芯片的数据读出，并根据预先设定的时段完成分时有功电能计量和最大需量计量功能，根据需要显示各项数据、通过红外或RS485接口进行通讯传输，并完成运行参数的监测，记录存储各种数据。、AT8951单片机、、Electricity automatic controller Abstract：Along with the material life of the rich, many people move into the city, as the 1 part of your life. We use FM3307\8 microcontroller as the core of the 8 measurement, let everyone know what number of pulses. 74HC164 series input and output 8 bit shift register and LED monitor can display real-time circulation of 8 real-time write AT24C16 when power AT24C16 can still save the data once again after power on the MCU will save the data read in order to achieve power-down protection. Electric energy meter through the RS-485 bus and the concentrator is connected to receive the meter reading concentrator reading or prepaid, reset command. Meter reading concentrator module MC55 to realize data ， the upload or command through GPRS communication network and center computer connection issued. When working, voltage through the resistor divider, a current through the current transformer in the sampling resistance after sampling, into the special power chip for processing, and converted into digital signal is sent to the CPU calculation. Due to the adoption of a special power chip, the voltage and current sampling resolution is improved greatly, and significantly improved. CPU is u