摘要随着国际社会、经济水平的发展，电力供应越来越紧张，国内外对多功能电能表的需求量正在快速增长，高精度三相多功能工业电能表也因此成为目前我国电能表行业研究的新课题。该类型电能表可以广泛应用于电能的高精度计量和工业自动化系统对电量的检测，如检测电流、电压、频率、有功功率、无功功率等。但是基于多功能电能表的成本以及可靠性等方面的考虑，多功能电能表并没有得到广泛地应用。因此，开发设计新型的三相多功能工业电能表对降低生产成本，提高计量精度都有十分重要的意义。本设计的三相多功能电能表系统以单片机AT89S51为核心，采用专用计量芯片ADE7758，集检测、计量、控制和通信于一体，能够广泛应用于各个工业系统中。设计的主要内容如下：(1)分析了三相多功能工业电能表的电能计量原理。(2)制定了基于单片机AT89S51的三相电度表的整体设计方案，并在此方案的基础上进行电能计量部分和控制部分电路的设计。(3)制定了软件的总体设计方案以及各部分的流程。 该电能表经过校正后能达到很高的精度，能精确的测量所需的各种电能参数。关键词 电能表 精确计量 AT89S51 ADE7758 AbstractWith international social and economic development, the electricity supply and more nervous, and a table for electricity demand is growing fast,so how to design a high-accuracy multi-function 3-phase power meter is a new subject in the relative fields in our country.This type of the instruments can be used for measuring electrical energy high accurately and monitoring electrical valume in induslrial automatic controling system,such as current,voltage,frequency,active power,reactive power,etc. But based on a cost of electricity to form and reliability considerations, the more electrical energy is not widely used. Therefore , it is very necessary and meaningful to design a new type of high-accuracy multi-function 3-phase power meter which can reduce the production costs and improve the measurement accuracy.In the design,a high-accuracy multi-function 3-phase power meter based on high-performance MCU AT89S51 and high-precision power chip ADE7758 are studied.The following are the main points:(1)Energy measurement principles of the high-accuracy multi-function 3-phase powermeter are analyzed.(2)The overall design of the high-accuracy multi-function 3-phase powermeter is studied.The metering part and the controlling part are designed,which is needed to enable the functions of the power meter.(3)The overall program of the software and the process of each part is designed. This kind of power meter will achieve high accuracy after calibration,which can exactly measure the technical parameters needed in monitoring electromotor.Key words Power Meter Accurate Measurement AT89S51 ADE7758目录摘要IAbstractII第1章 绪论11.1 研究背景及意义11.2 国内外发展情况1第2章 基于单片机的三相电度表的总体设计32.1 系统总体框图32.2 设计的主要技术指标42.3 电能计算的理论基础52.3.1 三相交流电信号模型52.3.2 电压、电流有效值的计算52.3.3 功率的计算62.3.4 频率的计算8第3章 基于单片机的三相电度表的硬件设计93.1 硬件电路的总体设计93.2 电流电压输入模块设计93.2.1 电流输入通道设计93.2.2 电压输入通道设计123.3 计量模块设计133.3.1 计量电路原理133.3.2 滤波器仿真163.3.3 电能芯片ADE7758简介163.4 单片机及外围电路设计183.4.1 单片机芯片简介及与外围电路的连接183.4.2 时钟模块设计223.4.3 铁电EEPROM接口电路设计243.4.4 串行通讯接口设计253.4.5 LCD显示电路设计263.4.6 按键模块设计273.4.7 复位电路设计283.4.8 电源电路设计29第4章 软件部分设计314.1 程序总体框架314.1.1 主程序流程314.1.2 初始化模块324.1.3 电能计量模块334.1.4 异常情况监测344.1.5 时钟模块354.1.6 键盘中断模块364.2 系统初始化374.2.1 MCU初始化374.2.2 外围设备初始化394.3 系统软件设计414.3.1 实时电能计量程序设计414.3.2 按键中断处理与时钟初值输入调整42结论44致谢45参考文献46附录48ContentsAbstractIChapter I Preface11.1 The background and meaningful11.2 Domestic and international development1Chapter II The overall design of 3-phase power meter based on MCU32.1 Overall system chart32.2 The design of the main indicators42.3 Electricity to the theoretical foundation52.3.1 Three-phase AC signal model52.3.2 Voltage and current value of effective52.3.3 Calculation of power62.3.4 Calculation of frequency8Chapter III The hardware circuit design of 3-phase power meter based on MCU93.1 The overall design of hardware circuit93.2 The design of current and voltage input socket93.2.1 The design of current input channel93.2.2 The design of voltage input channel123.3 The design of measurement module133.3.1 Measurement instruments circuit design principle modules133.3.2 Filter simulation163.3.3 The design of voltage input channel163.4 The design of MCU and the external circuits183.4.1 The profile of MCU and the connection of the external circuits183.4.2 The design of the clock module223.4.3 The design of the iron and electric EEPROM interface circuit243.4.4 The design of the serial communication interface253.4.5 The design of LCD display circuit263.4.6 The design of the key module273.4.7 The design of the reset circuit283.4.8 The design of the power circuit29Chapter IV The design of software314.1 The overall framework314.1.1 The main program flow314.1.2 Initialization module324.1.3 The module of electrical energy measurement334.1.4 Monitoring of unusual344.1.5 The clock module354.1.6 The module of keyboard interrupt364.2 System initialization374.2.1 MCU initialization374.2.2 Peripheral devices initialization394.3 The design of system software414.3.1 The design of real-time electrical energy measurement program414.3.2 Buttons suspended dealing with the readjustment of the input42Conclusions44Acknowledgements45References4