（毕业设计论文）《三相多功能电表设计》》.doc

三相多功能电表设计 摘 要 本方案主要由检测电路、专用电能计量芯片ATT7022、STC12单片机、128×64液晶显示、按键、RS485通信、红外通信以及电源部分组成。电路中的电流（电压）信号经过电流（电压）互感器，强电信号转换为安全的弱电信号，通过ATT7022把计量数据传给单片机，由单片机控制128×64液晶显示,另设按键可选择显示测量数据,并扩展RS485和红外线通信功能。因为ATT7022具有极高的精度，能够达到1级测量精度要求，由于互感器铁芯趋于饱和，当电力线路出现过电压或过电流时，其输出不会成正比的增加，能保护测量仪表设备。 关键词: STC12单片机 ATT7022计量芯片 三相电参数测试 RS485通信 红外通信 Abstract This scheme mainly consists of Detection circuit, Special energy metering ATT7022 chips，STC12，128 * 64 LCD display，key，RS485 communication，Infrared communication and power..The current in the circuit by current signal (voltage transformer, high voltage (voltage) signals are converted to electricity signal, the safety ATT7022 through the measurement data to SCM by single-chip microcomputer control, 128 * 64 LCD display, and buttons can choose to display measured data, and expand RS485 and infrared communication function. Because of the high precision, ATT7022 can reach 1 level measurement accuracy requirement, and because of transformer core tend to saturation, when power line voltage or current appeared, the output will increase, the proportional to the measuring equipment to protect. Keyword: STC12MCU ATT7022 measurement chip Three-phase electrical--parameter test RS485 Serial Communication Infrared communication infrared communication 目 录 第一章 绪论.........................................................1 1.1 课题的研究目的和意义.....................................1 1.2 课题的主要研究内容.......................................2 1.3 三相电表的研究情况及其发展...............................3 第二章 三相多功能电表的总体设计.............................8 2.1 方案论证................................................8 2.2 总体方案...............................................14 2.3 三相电表的工作原理......................................11 第三章 硬件设计..........................................13 3.1 硬件结构................................................18 3.2 测量单元................................................19 3.2.1 ATT7022简介...........................................19 3.3 单片机...........