基于单片机的多功能电表设计（（学士学位论文））.docVIP

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FM3307/8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 households electricity consumption measurement, let everyone know what how to use single chip microcomputer to measure the amount of power. 8 pulse output electric energy metering chip AD7755 to the residents of the electricity into a certain number of pulses. 74HC164 series input and output 8 bit shift register and LED monitor can display real-time circulation of 8 households of electricity. AT24C16 through the I2C bus and the singlechip is connected with the MCU will residents consumption 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 has GPRS communication 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 thr