多费率电能表的设计

Design of the Multi-rate Watt-hour Meter

介绍了一种基于PIC单片机的多费率电能表主电路及通信接口电路,阐述了电能表电路的工作原理。电量的测量采用AD7755专用芯片,可保证测量脉冲数的准确性;硬件日历时钟及参数存储采用串行I2C总线器件,减少了电路连线,提高了电能表工作可靠性。

This paper introduces the main control and communicating interface circuits of the multirate watthour meter based on PIC single chip. It also introduces the principle of the multirate watthour meter. The measuring of watthour has higher accuracy by the special AD7755; addresses and data of the clock/calendar and data storage circuits are transferred serially via the twoline bidirectional I2C bus, it simplifies circuit and enhances the reliability.