多功能数字电能表设计.doc

摘要随着我国经济的飞速发展，电能消耗日益增加，电能成为现代社会国民经济和人民生活的重要保障。单相电子式电能表以其计量程度高、成本低等优势 在我国开始逐步推广使用。文章概述单相电子式电能表的发展与需求，介绍单相电子式电表的原理与优点，提出单相方案。该系统主要由显示模块、键盘模块、时钟模块、存储模块、通讯模块、CPU 模块、CS5460电能表计量芯片模块和前端电路调理模块八部分组成。前端电路调理模块采用2mA/2mA 的电流互感器和 5A/2.5mA 电流互感器和精密电阻实现对市电的转换，并采用 RC 滤波网络滤波，然后采用由美国CRYSTAL公司的新型电能计量芯片 CS5460 芯片实现对电流、电压和电能的测量与转换；时钟模块采用 DS1302 时钟芯片为系统提供时钟基准，存储模块采用 AT24C16，为系统提供数据存储；显示模块用 OCMJ4X8CM 液晶，通信模块采用 Max232 芯片，并利用 AT89S52 组成的CPU模块控制所有芯片的工作、测量、计算电能，送往显示模块和存储模块进行实时显示和存储，并通过标准 RS-232 接口送往 PC上位机进行同步显示，并且本电能表还设有GPIB 地址，以便于电能管理系统对电能的管理。 关键词 CS5460；AT89S52；MAX232通讯；OCMJ4X8CM -I- Abstract Along with the rapid development of Chinas economy, power consumption, increasing power becomes the modern society of national economy and peoples life important guarantee. Because the degree of the single-phase watt-hour meter measure is high, low cost advantage in China began to gradually spread the use of it. Developed so far, the measurement circuit technology already from the analog circuit improve on time-multiplier for digital multiplier another one circuit, the market share has amounted to more than 60%. In the international market, Chinas production of single-phase watt-hour meter with strong competitiveness and wide prospect of market. This article summarizes the development of single-phase watt-hour meter and demand; this paper introduces the principle of single-phase watt-hour meter and advantages, and puts forward the design scheme of single-phase watt-hour meter. This system is mainly revealed the module, keyboard module, clock module, store module, communicate module, CPU module, CS5460 electric energy meter chip module and front circuit look after the part of the module to make up. The front circuit recuperates the module and adopts electric current mutual inductor and 5A/2.5mA electric current mutual inductor and accurate resistance of 2mA/2mA to realize the conversion of the city electricity, and adopt RC to strain the wave network and strain the w