摘 要：随着经济的迅速发展，用电量日益增加，为电网的稳定运行带来了诸多不良因素。传统的电量计量工具已经不符合现代电量科学管理的要求。设计的单相电能表价格低廉、运行稳定、可靠性高、抗干扰能力强。本设计在对电能计量和数字信号处理理论研究的基础上，以美国ADI公司生产的ADE7755为电能计量芯片，以单片机为主要控制芯片，设计开发了一款单相复费率智能电子式电能表，硬件外围电路采用模块化设计，其中电压电流采样模块实现了将电网中的不可直接测量的大电压大电流转变成为可以用来处理测量的小电压小电流。电源模块为整个智能电表提供了稳定的电源。67558

毕业论文关键词：ADE7755,单相电能表, 数字化,单片机控制

Abstract: With the rapid development of economy, the power consumption is increasing, which brings many bad factors to the stable operation of the power network.The traditional measurement tools are not in accord with the requirements of modern energy management.The single phase meter can be designed for low price, stable operation, high reliability and strong anti-interference ability.The design of electric energy measurement and digital signal processing theory research foundation and by the ADI production for electricity energy measuring chip in, single-chip microcomputer as the main control chip,design and development of the a single-phase complex rate of smart electronic electric energy meter, hardware peripheral circuits with module design, which voltage and current sampling module realizes the power grid in the direct measurement of high voltage and large current changes become can be used to measure small voltage and small current.The power supply module provides a stable power source for the entire smart meter.

Key words: ADE7755, Electronic Energy Meter, Digital,MCU Control

目   录

1 绪论 4

1.1 电能表应用现状 4

1.2 单相电能表的发展趋势 5

2 单相电能表原理 6

2.1 电能计量原理 6

2.1.1 纯正弦波电能计量 6

2.1.2 非正弦波电能计量 8

2.2 常用单相电能计量技术 8

3 单相电能表硬件系统设计 8

3.1 计量电路设计 10

3.1.1 ADE7755特性 10

3.1.2 ADE7755工作原理 10

3.1.3 电压电流采样点路设计 11

3.1.4 计量参数计算 13

3.1.5 计量电路 14

3.2 控制电路 15

3.3 电源电路设计 16

3.4 LCD显示电路 17

3.5 掉电检测与数据存储 17

3.6 实时时钟电路 18

4 误差分析与软件设计 20

4.1 误差特性分析以及调整 20

4.1.1 电流互感器TA引起的误差 20

4.1.2 分压器引起的误差 21

4.2 软件设计 21

4.2.1 主程序 21

4.2.2 复费率电能计算处理子程的设计