范文编号:JD706 范文字数:21132,页数:78 摘要:本设计——低频数字式相位差测量系统使用FPGA和单片机相结合,构成整个系统的测控主体。FPGA主要负责采集两个同频待测正弦信号的频率和相位差所对应的时间差,而两个同频待测正弦信号经过信号整形电路变成方波后送入FPGA数据采集电路中。而单片机负责读取FPGA所采集到的数据并根据这些数据计算待测正弦信号的频率和相位差,并同时通过功能键切换在八位七段共阳极数码管上显示出待测信号的频率和相位差,具有数字显示功能。此系统具有不易受外界干扰,可靠性好,测量精度高等优点。如在此设计基础上进一步从可靠性、稳定性等方面进行完善,便可应用于实际的工业系统之中。 关键词:相位差;测量;FPGA;单片机 The Design of Low-Frequency Digital Phase Difference Measurement Instrument Abstract: The design that low-frequency digital phase difference measurement system combines FPGA with SCM which constitutes the main measuring and controlling system of this entire design. FPGA is used to collect the time differences respectively corresponding to the frequency and phase difference of the measured sine signals with the same frequency .Ahead of that ,the measured sine signals of the same frequency should be changed to the forms of square waves by the plastic circuit module.At the same time, SCM is used to accept the data signals collected by FPGA , and then according to these data signals ,calculates the frequency and phase difference of the measured sine signals with the same frequency. And also on the meanwhile, SCM can switch the function buttons to show frequency and phase difference by the 8 Common Anode Seven-Segment LEDs which have the functions of digital display. This system can resist the outside interferences and has the advantages of reliability and high- precision measurement .If this design is further improved in stabilization and reliability , it can be used in the real industrial system . Keywords: phase difference; measurement; FPGA; SCM
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