摘要
本文主要介绍了一款以电能计量芯片ATT7022A为基础,以NEC的78K0/LF3系列的uPD78F0485为主控芯片的三相三线多功能电表。该表采用液晶显示,能精确地测量有功、无功电能量,有功和无功功率,电压、电流和功率因数等多参量,并依据相应费率要求进行数据处理。该表具有RS485和Zigbee两种通信方式,并有硬件和软件的密码保护和防掉电保护措施。
This paper introduces a three-phase three-wire multifunction meter based on the ATT7022A and UPD78F0485,one of the NEC＇s 78K0/LF3 series chip,as the main control chip.The meter displays via LCD,which can accurately measure the active and reactive electric energy,active and reactive power,voltage,current,power factor and many other parameters.Then it deals with the data based on the relative rate correspondingly.The meter has two communication interfaces which are RS485 and Zigbee.It also has the hardware and software password protection and anti-power-down protection.
