低成本高可靠性电子化IC卡电表的开发研究

IC卡电度表是选用最新电子器件AD7755、IC卡以及单片机等部件,经过精心设计,达到完全电子化,满足多种情况下的精度要求.例如远远高过功率因数(PF)等于1时和PF较低(PF±0.5)时的精度要求,同时电度表的动态范围也超过500.本文介绍了整个系统的结构和原理,包括单片机、IC卡以及AD7755的硬件设计,详细论述了在可靠性方面采取的硬件措施,并给出了电原理图.

Electronic IC card kilowatt-hour me ter of low cost and high relia bility

This article introduces IC card kilo watt-hour mete r which is made up of up-to-the-minute electronic devices AD7755and IC card and single chip etc.After elaborate design,it is fully electronic and mee ts the demands of precision in man y cases.eg,it is far higher than the d eman ds of precision when PF =1and PE =0.5.Meanwhile,the dynamic s cope of wa tt-hour meter is more than 500.This article also intro-duces the structur e and principles o f the whole system,including single chip,IC card and AD77 55hardware design.It disensses specially the measures of hardware taken in re latio n to reliability,presenting a diagram of electric principles.