基于ARM微处理器的电参数测量设

基于ARM微处理器的电参数测量设

文档编号:CK079 文档字数:17063,页数:48

摘要

电力是人们日常生活和工业生产中的主要能源，在现代社会中起着越来越重要的作用。对电参数的测量包括对电网中交流电压、电流、功率、频率和相位等参数的测量，它在电力系统中起着非常重要的作用。传统的电参数测量仪实时性差、精度较低、硬件电路复杂、不易调试、可靠性低而成本高。本课题研究的对电参数测量的方法是基于32位ARM微处理器LPC2138和16位6通道同步采样AD转换芯片ADS8365为核心的先进芯片去实现的。对电网中最重要的电参数三相电压电流完成高速、高精度的同步采样，使仪器的电压电流的测量精度和实时性大为提高。同时仪器运用了软件智能同步采样测量策略、智能仪器的数字校准，这也是传统电参数测量无法比拟的，并且结合由液晶显示器和旋转式光电编码开关构成的人机交互界面，使电参数仪器的操作向智能化迈进，因而具有一定的先进性和较广的应用面。
关键词 ARM微处理器；交流电参数；数字校准；ADS8365；相位

Abstract

Power is major energy in the daily lives and industrial production, it is playing an increasingly important role in modern society. Measurement of electrical parameters including the measurement of AC voltage, AC current, power, frequency and phase etc, it plays an important role in power system . Traditional measurement of electrical parameters is poor of real-time, low accuracy, complex hardware and difficult to debug, the high cost and low reliability. The research on the measurement of electrical parameters is based on the advanced chips of 32-bit ARM microprocessor LPC2138 and 16-bit 6-channel simultaneous sampling AD converter ADS8365 to achieve. The completion of high-speed, high-precision synchronous sampling in the most important electrical parameters of three-phase voltage and current in power network, making the measuring precision of the instrument and the real-time of measuring the voltage and current have greatly improved. At the same time, synchronous sampling measurement using the software strategy of intelligent, the number of intelligent instrument calibration, which is the traditional measurement of electrical parameters can not be compared. And it also combined man-machine interface which consisting of LCD and Rotary photoelectric encoder rotary switch, so that electrical parameters equipment forward to the intelligent operation, which is advanced, and have a wide range of applications.
Keywords ARM microprocessor; AC parameters; digital calibration; ADS8365; phase

目录
摘要………………………………………………………………………………………………I
1 绪论……………………………………………………………………..……………………..1
2 总体设计方案………………………………………………………….………………….....2
2.1 系统总体结构…………………………………………………….……………….……2
3 电参数采集测量系统模块……………………………………….……...………………..3
3.1 ADS8365介绍……………………………………………………………..…………… 3
  3.1.1 ADS8365的主要特性………………………………….….….………………...3
  3.1.2 ADS8365前端调理电路…………………………………………………..……4
        3.1.2 ADS8365的操作及软件编程…………………………………………………..5
3.2 微处理器LPC2138介绍………………………………….……………………………6
  3.2.1 LPC2138性能介绍………………………………….….………………………6
  3.2.2 LPC2138定时计数器应用…………………………..…………………………7
  3.2.3 LPC2138I2C中断应用…………………………………………………………8
  3.2.4 关于中断嵌套的实现…………………………………………………………10
4 三相电压、电流以及功率的测量……………………………………………………...11
4.1 电压信号的前置处理…………………………………………………………………11
4.1.1 微型精密电压传感器介绍…………………………… ……………………...11
  4.1.2 电压采样电路原理…………………………………………………………….12
4.2 电流信号的前置处理……………………………………….…………………………12
4.3 功率测量原理介绍………………………………………….…………………………13
5 频率和相位的测量……………………………………….……..…………………………14
5.1 频率测量方法介绍…………………………………..……….…….…………………14
5.2 相位测量方法介绍……………………………………………………………………14
6 人机界面模块设计………………………………………..………………………………16
6.1 液晶显示模块介绍……………………………………………………………………16
6.1.1 SED1335的特点和结构…………………………………………………………16
6.1.2 SED1335指令集…………………………………………………………………17
6.1.3 接口电路设计及编程原理……………….………………………………………18
6.2 界面操作模块介绍…………………………...…..……………………………………19
6.2.1 I2C总线器件PCF8574介绍……………………………….………………19
6.2.2 旋转式光电编码开关功能介绍…………………………………………………20
6.2.3 编码开关软件实现………………………………………….…………………..21
7 测量策略与误差分析………………………………………………………………………23
7.1 参数自寻优采样法的实现…………………………………………………..…………23
7.2 数字校准技术实现…………………………………………………………..…………23
7.3 交流采样误差分析……………………………………………………..……………24
8 总结……………………………………………………………………………………………26
致谢………………………………………………………………………………………………27
参考文献…………………………………………………………………………………………28
附录1 实物图………..……………………………………………………………………………30
附录2 参数测量系统C语言程序…..…………………………………………………………30

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