Abstract
The watt-hour meter has a history of more than 100 years so far as born, and its products have already gone through several update. Currently on the market are mainly mechanical and electrical meters, electronic meters, digital meters, IC card and other types of watt-hour meter.
The design single-phase multi-function digital watt-hour meter is mainly offered forCivilian. The design adopted two key chips: the mcu P87LPC764 and the integrated circuit of electric energy measurer AD7755. The External voltage and current get to partial pressure circuit and electric current mutual inductor respectively input to the AD7755, the AD7755 amplify the signal, modulus change, phase place correct, the high pass strains waves, and then by multiplier, low to strain wave, digital frequency output the pulse signal in direct proportion to instantaneous power after changing while being coherent, then give this signal to the P87LPC764. The P87LPC764 passed by the time pulse integral cumulative count showed consumption .
The tasks include the development of design Energy Meter Design understand the basic requirements and related standards，learning and choose device，design line ，PCB design ，physical production ， dbugging.
The Design particular attention to measurement devices embody the consistency, stability, accuracy and other technical requirements
Keywords ： watt-hour meter，electric, microcontroller unit
