一种带超前滞后检测的数字相位差测量仪

A Digital Phase Difference Measuring Instrument with Lead and Lag Detection

提出一种带超前滞后检测的数字相位差测量仪的实现方法，两路输入信号经波形变换电路后．一路通过相位差测量电路、低通滤波器来实现相位差测量，另一路通过超前滞后检测电路进行相位超前滞后检测，最后通过AD转换、MCU控制电路和LCD显示电路。这种设计不仅实时显示信号的相位差，同时也显示出信号相位的超前滞后关系。实验表明，该数字相位差测量仪鉴相范围-2π～2π，线性度良好，灵敏度高。该设计具有反应速度快，可靠性高，适用范围广等特点，可满足绝大部分场合对相位差测量的需求。

Presents the implementation of a digital phase difference measuring instrument with lead and lag detection. After the waveform transform circuit, one way, through phase difference measuring circuit, low pass filter, the function of phase difference measurement is realized. Another way, the circuit with lead and lag detection is used to detect. Finally through the AD conversion, MCU control circuit and LCD display circuit. This design displays the discrimination in real time, and also displays the signal＇s relation with lead and lag in real time. The experiment results show that the phase can reach -2π-2π, good linearity, high sensitivity. The design has the characteristics of fast response, high reliability and wide application range, which can meet the requirement of the measurement of phase difference in most occasions.