8户单相电能表(初次修改).doc

课程设计 多用户多功能电子式单相电能表设计 摘要 本文设计了一个8用户多功能电子式单相电能表，通过AD7755芯片对每户用电电压和电流实时监测，测量用户的用电量，将测量结果转换为脉冲。单片机采集由AD7755送来的脉冲，并根据脉冲个数通过编程计数处理，计算出各个用户的用电量，并在LED数码管上轮流显示。数码管前两位用来显示用户号，后四位显示用电量。8个按键实现对应于8个用户的清零操作，并且本电能表还可实现掉电保护功能，每隔3秒或每次用户清零后，单片机立即将8个用户的电量送到外部AT24C16芯片中储存，每次重新上电后都能读取掉电前的结果并显示。所用单片机为C8051F360，主要包括电能转换、数码管显示、按键清零和掉电保护模块。电能表读取电量方便，可靠准确，电路设计简单，实用性强。 关键词：C8051F360单片机；AD7755芯片；AT24C16芯片；LED数码管； ABSTRACT This paper presents an 8-user multi-function electronic single phase energy meter, household electricity consumption by AD7755 chip real-time monitoring of voltage and current measurements users of electricity consumption, the measurement result is converted to pulses. SCM Acquisition pulses sent by the AD7755 and processed by programming based on counting the number of pulses to calculate the power consumption of each user, and turns on the LED digital display. The first two used to display digital subscriber numbers, after four display electricity consumption. 8 keys corresponding to eight users to achieve clear operation, and the power meter can be powered-down protection, every three seconds or after each user is cleared, the microcontroller immediately 8 users of electricity to the external AT24C16 chip storage, before power can read the results after each power cycle and displayed. The MCU is a C8051F360, including power conversion, digital display, keypad cleared and power-down protection module. Read the electricity meter is convenient, reliable and accurate, the circuit design is simple and practical. Keywords:C8051F360 micro-controller;AD7755 chip;AT24C16 chip;LED digital tube; 目录 第一章 绪论 1 第二章 设计任务及要求 2 2.1 设计内容 2 2.1.1 硬件设计 2 2.1.2 软件设计 2 2.1.3 设计参数 2 2.2 设计要求 2 第三章 设计原理分析 3 3.1 设计系统方案 3 3.2 设计方案总框图 3 第四章 硬件设计 4 4.1 硬件设计综述 4 4.2 单片机电路板设计 4 4.3 AD7755外围电路设计 5 4.3.1 AD7755芯片特性和内部结构 5 4.3.2 AD7755电能转换设计原理 6 4.3.3 AD7755参数分析及计算 7 4.3.4 AD7755通道一输入电路设计及参数分析 8 4.3.5 AD7755外围电路设计 11 4.4 +5V稳压电源设计 12 4.4.1稳压电源原理 12 4.4.2 参数设定 1