基于NEC单片机的智能电表控制系统设计

摘要

设计了一种能够实现远程控制的单相智能电表。硬件部分包括NEC78F0411单片机外围电路设计，电能计量芯片外围电路设计和通讯模块电路设计，同时也进行了计量模块的软件设计。能够对电能精确地计量，电量和功率的实时显示，单片机和外部存储器的读写，通过485总线与上位机通讯，进行远程控制，包括购电、抄表、定时通断电、超过功率断电等功能。电表硬件设计简单，功能完善，软件部分能进行正负电能的计量。解决了大功率电器和空调的智能识别，在某些高校得到了较好的应用。%A kind of single-phase intelligent electric meter for remote control was designed.Firstly, peripheral circuits including NEC78F0411 single-chip computer,chip for measuring of electric energy and chip for communication have been designed,then,software for measuring of electric energy has been developed.It can measure electric energy accurately,real-time display electric energy and power,read and write from EEPROM to single-chip computer,remote control through RS-485 bus to communicate with host computer,including power purchase,automatic meter reading,timing switch on-off electricity,forced interruption when overpower.Its hardware was designed uncomplicatedly.It has complete function and can calculate positive and negative energy.Intelligent distinguish air-conditioner from high power electric appliances has been solved,it has been put into use in some universities successfully.