测量电压、电流、功率_大学生毕业设计（论文）说明书.doc

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?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、控制和显示等功能. 本设计是一种基于 AT89C51 单片机的测量电量的数字表,以 AT89C51 单片机和 ADC0809 为核心器件. 该系统的数字电压表电路简单,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、测量准确度高. 整个测量系统主要测量电压电流两个主要参数,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 meter . The 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 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 to,