基于单片机的阻抗测量分析仪的设计

论文编号:JD1155  论文字数:9988,页数:41

摘  要

 本阻抗测量分析仪以Soc单片机C8051F020为控制和数据处理核心，由正弦信号发生模块、功率放大模块、阻抗模测量模块、阻抗角测量模块、网络负载以及人机接口模块组成。采用数字控制DDS芯片AD9851产生100Hz－10KHz正弦信号，经滤波、电压放大和功率放大后驱动网络负载。从网络负载中取测量信号输入到以真有效值转换集成芯片AD637为核心的电压和电流测量电路构成的阻抗模测量模块中进行负载测量。阻抗角测量模块是从阻抗模测量模块中取一组信号经过零比较后使用鉴相器和计数器对信号相位差测量。把上述的测量结果经单片机处理后用液晶显示。为了提高测量精度，将各部分电路的误差合理分配，使电路达到最佳测量效果。
关键词：阻抗，DDS，AD637，阻抗测量分析仪

Abstract

 This impedance measure analyzer take Soc microcontroller C8051F020 as the core of the control and the data processing, which is composed of the sine signal generator module, the power enlargement module, the impedance survey module, the impedance angle survey module, the network load as well as the man-machine interface module. The 100 - 10 KHz sine signal is generated by AD9851, which drivers the network load after passing the filter, the voltage amplification and the power enlarges module. The impedance survey module is composed of voltage and current metering module, which takes AD637 as the core, which the survey signal is metered in. The impedance angle survey module takes a group of signals from the impedance survey module to the zero detecting module to survey the shift of phase of the signal. The above measurement result which is processed by the microcontroller is shown in the LCD. In order to increase the measuring accuracy, error is distributed rational to each part of electric circuits, which achieves the best survey effect of the electric circuit.
Keywords: impedance, DDS, AD637, impedance measure analyzer

目  录

第一章  概述
 1.1 课题背景
 1.2 课题意义
第二章  系统方案论证 1
 1.1 系统原理介绍 1
 1.2 方案论证 1
 1.2.1 方案选择 2
 1.2.2 方案组成及框图 4
1.3 部分选用芯片简介 5
1.3.1  Soc单片机C8051F020 5
1.3.2  直接数字频率合成芯片AD9851 6
第三章  系统硬件设计 8

第四章  系统软件设计 17
3.1 Silicon Lab集成开发环境介绍 17
第五章  系统调试 34
4.1 硬件电路调试 34
4.2 软件调试过程 34
4.2.1 调试软件的使用 35
4.2.2 功能模块调试 38
4.2.3 操作说明 38
4.3 调试结果 39
第六章   总   结 40
致   谢 41
参考文献 42
附件：整机电路图 43