【作者】 王秀霞；

【导师】 郑绳楦；

【作者基本信息】 燕山大学 ， 电路与系统， 2004， 硕士

【摘要】 随着科学技术的发展，相位测量技术的应用已深入到许多领域和部门，对它的精度也要求越来越高。本课题是以实现两路工频正弦信号的相位测量为目的，在对国内外的各种相位测量系统进行了深入分析的基础上，针对相位测量系统的各个环节进行了研究。根据相位测量系统的工作流程，将整个系统分为信号调理模块、数据采集和处理模块、液晶显示和数据传输模块，再细化分成功能单一的模块，然后对这些模块分别进行设计和调试。数字信号处理(Digital Signal Processing)是一门涉及许多学科而又广泛应用于许多领域的新兴学科。相位计采用数字信号处理技术，可以有效地实现相位差的高精度测量。本文采用数字过零鉴相法，利用新器件TMS320LF2407 DSP芯片为核心处理单元，进行相位测量的设计与实现，对各个单元结构的功能与实现方法进行了详尽的分析。采用前置电路将被测信号(电压或电流)变换为小电压信号，经过信号调理电路对信号进行程控放大和滤波后，通过TMS320LF2407实现信号的数据采集、信息处理和计算，将测量结果通过液晶模块显示，还可经过RS232接口与计算机进行数据传输，做进一步的分析和应用。本文最后还对影响相位测量精确度的主要因素进行了深入细致的分析和研究，提出了提高相位测量精确度的方法。将新器件、新方法和新技术应用于相位测量技术中，相位计的性能和精确度得以显著提高。更多还原

【Abstract】 With the development of science and technology, the phase measurement technique has gone deep into many fields and departments and it requires more and more precised.The purpose of subject is to achieve the phase difference measurement of two 50 Hz sine signals. Based on the further analysis about all kinds of phase measurement system, the research of phase measurement system for 50 Hz sine signals is made in the paper. According to the work flow, the entire system can be divided into several blocks: signal adjust model, data acquisition and management model, LCD display and data transmission units. These units can be subdivided single function parts, which are designed and tested respectively.The technique of digital signal processing(DSP) has been found to be an effective tool in phase measurement. This paper presents a solution for phase measurement using numeric zero-crossing and TMS320LF2407 16-bit fixed-point digital signal processor. In addition, the paper analyses the electronic circuits in detail. The input signals pass through the prepositive circuit which transforming the measured signals(voltage or current) into small voltage signals, the signal adjust circuit consist of programmable-gain amplifier and filter, and digital signal processor TMS320LF2407 for data acquisition and processing in turns. Provide the measuring results on LCD module. And also can transfer data to the PC’s RS232 for farther analyse. The paper also analyses in detail main factors which influence the precision of phase measurement and come up with the methods of improving the precision of phase measurement.The application of advanced devices, new methods and latest technology to phase measurement results in dramatic improvement of function and precision of phase meter.更多还原