文档介绍：编号:
毕业设计说明书
题目: 测量电压、电流、功率
的数字表的设计
学院: 机电工程学院
专业: 电气工程及其自动化
学生姓名: 韦领
学号: 0600120328
指导教师: 郭福力
职称: 工程师
题目类型:¨ 理论研究¨ 实验研究þ 工程设计¨工程技术研究¨ 软件开发
2010年 05月 24 日
摘要
在现代检测技术中,常需用高精度数字电压表进行现场检测,将检测到的数据送入微计算机系统,完成计算、存储、,,所用的元件较少,成本低,调节工作可实现自动化:数字电表抗干扰能力强、测量速度快、,只要测出这两个参数就可以计算出有功功率和无功功率。整个系统的设计完成了硬件电路的设计及软件程序的编写,通过最终硬件电路的调试及软件程序的仿真,使该系统能够在要求的条件下达到正常的测量及显示功能。在整个系统的设计过程中,主要采用了模块化的设计方法。该系统主要分为四大模块,即输入信号衰减模块、主控制模块、A/D转换模块和输出显示模块。由于实际电路中的电量参数太大,ADC0809直接采集会使器件被损坏,因此先对电量信号进行衰减,在单片机的控制下完成对电压、电流信号采集,并对电压和电流的相位进行比较得到功率角,最后将测量结果通过LCD1602液晶显示出来。该电路设计新颖、功能强大、可扩展性强。
关键字:AT89C51单片机;ADC0809;模块化;数字表
Abstract
In modern measuring technology,it is often required to conduct site measuring with a digital data measured will then be input into the puter system to execute such functions like calculating,storing,controlling and non-electricity measurement digital electric meter based on AT89C51 is is pleted measurement systern based on the AT89C51 and AD0809. The digital meter meter features in simple electrical circuit,lower use of elements,low cost and automatic regulation. The digital meter strong anti-jamming ability, Measuring speed, high accuracy field measurement methods .The measuring system, the main measure two main arguments are voltage and current. Just measured out the two arguments,it can calculate the active power and the reactive power. In this design, the hardware circuit and software programming are both realized at the judge of hardware circuit and imitation of software program. This system can fulfill the function of measure and displaying under the demanded conditions. Over the designing of the whole system, the method of modularity is used. The system is mainly divided into four modules:for example,the module of input signal attenuation,the module of master control, the module of ADC, the module of display export signal. Due