毕业设计（论文）-单片机数字相位测量系统设计.doc

摘要
本论文针对在个工业和民用场合,为了对各种低频信号进行分析,常常引入相位测量,而典型的传统方法是通过显示器测量,这种方法误差比较大﹑读数不方便等问题,本论文就此问题设计了一种数字相位测量仪对其进行相位时间间隔测量。以单片机AT89C51为核心,用零比较器LM393将正弦波信号转换为方波,通过由D触发器组成的双稳态触发器实现两方波信号的相位差,将得到的信号经过模拟开关进行整幅,,低电平为0V,整幅后的波形经整流滤波形成直流电压,对不同的占空比输入直流电压在0V~,用16位A/D7705进行采样,°。显示采用七段LED数码管,并用MAX7219作为显示器的驱动,对LED的亮度进行调节。论文设计了相位比较电路、移相电路、显示电路、直流稳压电路。系统采用软硬件结合的方式,测量精度高、稳定性好、操作简单,适合使用于各种需要的低频相位测量场合。

关键词:相位测量、相位时间间隔测量、单片机(AT89C51)
Abstract
analyzed, This paper in a industrial and civil occasions, in order to all kinds of low frequency signal is often introducing phase measurement, the typical and traditional way is through display measuring, this kind of method error is bigger, reading is convenient wait for a problem of this issue, this paper designs a digital phasic measuring instrument for its phase time-interval measurement. With single-chip puter AT89C51 as the core, with parator LM393 will sine signals converts square-wave by D flip-flop, composed of bi-stable flip-flop reach two square wave signal of phase, will receive the signal for the whole picture after analog switch, make high level for the datum voltage V, low level for 0V, whole picture after the formation of the waveform dc voltage rectifying filtering for different 390v input dc voltage in 0V ~ V, with 16 A/D7705 sampling, can make its precision far outweigh the design requirements of °. LED digital display using seven section, and MAX7219 as monitor tube to drive, LED the brightness of the adjusted. Paper designed a parison circuit, phase shifting circuit, display circuit, dc voltage circuit. System adopts hardware and bination way, high accuracy, good stability, simple operation, and suitable for use in various needs of low-frequency phase difference measurement occasion.
keywords: Phase difference measurement Phase time-interval measurement SCM (AT89C51)

目录
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国内外相位检测技术的发展现状………………………………………………..….5
本课题研究的主要内容………