毕设论文—工频电压有效值的数字测量系统(完整).docVIP

目录 摘 要 iii Abstract iv 1 绪论 1 1.1本课题提出的背景和意义 1 2工频电压最大值数字测量系统方案设计 2 2.1 方案比较与论证 2 2.2本文的主要研究内容 2 2.3总体设计方案 2 3 工频电压有效值数字测量系统的硬件电路设计 4 3.1有效值的检测模块 4 3.2信号调理模块 8 3.3 AD转换模块 8 3.4 单片机主电路模块 11 4 工频电压有效值数字测量系统的软件设计 12 4.1 主程序设计 12 4.4 延时程序设计 13 4.5 数码管显示程序设计 14 4.6 A/D转换程序设计 16 5 工频电压有效值数字测量系统的调试及结果分析 17 参考文献 20 附录一 21 附录二 22 摘 要 随着电子科学技术的发展，电子测量成为广大电子工作者必须掌握的手段，对测量的精度和功能的要求也越来越高，而电压的测量甚为突出，因为电压的测量最为普遍。在实际中，有效值是应用最广泛的参数，电压表的读数除特殊情况外，几乎都是按正弦波有效值进行定度的。有效值获得广泛应用的原因，一方面是由于它直接反映出交流信号能量的大小，这对于研究功率、噪声、失真度、频谱纯度、能量转换等是十分重要的；另一方面，它具有十分简单的叠加性质，计算起来极为方便。本设计以Atmel公司的AT89S52单片机作为控制核心，真有效值测量模块，信号调理模块，AD采集模块及控制、显示模块等构成。系统采用分压电路对输入信号进行降压处理，经AD736转换得到原信号的真有效值，由ADC0809转换为数字量后送入单片机内进行简要的数据处理并将结果通过数码管实时显示，达到了较好的性能指标。 关键词：工频数字电压表；AT89S52；AD736；ADC0809 Abstract With the development of electronical scientific technology, electronical measurement became a technic that everyone of engaging electronical had to master it. What?s more, the precision is higher and higher and, the function is more and more powerful, and voltage?s measurement is best important.In practice, RMS is the most widely used parameters. Except in special circumstances,voltage meter readings almost all carried out by the RMS of sine wave . The reasons of RMS is widely available, on the one hand, because it directly reflects the size of the exchange of signal energy, which the study of power, noise, distortion, spectrum purity, energy conversion, such as it is very important; On the other hand, it has a very simple superposition of the nature of the calculation will be extremely convenient. The design of single-chip Atmel Corporation AT89S52 as control core, by the True RMS measurement modules, signal conditioning modules, AD acquisition and control module, display module. System uses a current sensor circuit for step-down of the input signal processing, has been converted by the original AD736 True RMS signal by the ADC0809 convert into single-chip digital conducted after the brief and the results of data processing in rea