高精度电容电感测量系统设计

电子机电论文编号:JD867  附开题报告,任务书,外文翻译,论文字数:11298,页数:34

摘要 
目次 
1 绪论  1
1.1 背景  1
1.2 目的  1
1.3 意义  1
1.4 论文结构  1
2 系统测试原理与总体方案设计  3
2.1 LC及R（相同原理下的添加）测量原理  3
2.1.1 相位加有效值测量  3
2.1.2 相位加有效值测量方案软仿真  4
2.1.3 系统参数测量方法  5
2.2 总体方案设计  6
2.2.1 系统原理框图  6
2.2.2 整个系统工作流程  6
2.3 系统设计中的难点和关键技术  7
3 硬件中模块设计  8
3.1 标准正弦信号发生模块  8
3.1.1 标准正弦的原理  8
3.1.2 AD9850芯片简介  10
3.1.3 AD9850硬件电路图及单片机程序  12
3.2 -5V电源设计  13
3.3 I-V变换模块  14
3.3.1 I-V变换方案设计  14
3.3.2 I-V变换的硬件电路  14
3.4 同时采样模块  15
3.4.1 同时采样模块的方案设计  15
3.4.2 A/D芯片选择  15
3.4.3 ADS7861芯片介绍  16
3.4.4 ADS7861转换时序的逻辑控制  17
3.5 单片机系统设计  18
3.5.1 SPCE061A单片机概述  18
3.5.2 单片机电源设计  19
3.5.3 SPCE061A最小系统设计  20
3.6 显示模块  22
3.6.1 数码管工作原理  22
3.6.2 数码管显示电路及数码管显示流程图  22
4 系统应用软件设计  25
4.1 数据采集模块程序流程图  25
4.2 中断流程图  26
4.3 主程序流程图  27
5 总结  28
参考文献  29
致谢  30
附录A  31
附录B  33

摘要：目前的电感电容轻便仪器设计中存在精度不够高、智能化程度不足的问题。鉴于这样的原因，本文介绍了一种基于单片机的高精度电感和电容测量仪器的设计。由于电容和电感属于电抗元件，因此不能采用直流来产生测量信号，而只能采用交流信号。本设计采用DDS芯片AD9850产生高精度正弦波信号流经待测的电容或者电感和标准电阻的串连电路，通过测量相关量，利用“相位+有效值”的方法推算出电容或电感值。本设计充分利用单片机的运算和控制功能，方便地实现测量，使测量精度得到了提高。同时用软件程序代替一些硬件测量电路，可在硬件结构不变的情况下，修改软件以增加新的功能。能够很好的完成对各参数的测量，以满足现代测控系统的需要。

关键词：电容测量； 电感测量； DDS;  单片机

The design of a high-precision instrument for inductance and capacitor measurement

Abstract: At present, the problem of the light equipment for inductance and capacitor measurement is low accuracy and lacking of intelligence. In view of this reason, the paper introduced a high-precision instrument for inductance and capacitor measurement based on single-chip. As a result of inductance and capacitor are reactors components, DC can not be used to generate measurement signals, but only AC signals. The design adopted AD9850 to produce a high accuracy sine wave signal, which is implemented through the series circuit of the capacity or the inductance and the standard resistance. By measuring the relevant quantity, the “phase+RMS” approach is used to estimate the value of capacitance or inductance.     By taking full advantaged of the single-chip computing and control functions to facilitate the realization of measurement, the measurement accuracy has been enhanced. At the same time, a number of software programs instead of hardware measurement circuit under the hardware architecture invariable situation are applied to modify the software to add new functions,  which may complete a very good measurement of various parameters in order to meet the needs of modern measurement and control system.

Keywords: Capacitance measurement; Inductance measurement ; DDS; Single-chip