基于单片机的简易数字相位计设计  

Design of Digital Phase Detector Based on MCU

作　　者：孙英晖[1] 曹丽剑[1] 陈孝桢[1] 

机构地区：[1]南京大学电子科学与工程系,江苏南京210089

出　　处：《仪表技术》2007年第7期22-24,共3页Instrumentation Technology

摘　　要：介绍一种以单片机为核心的数字相位计。由过零检测及异或电路,将两路输入信号的相位差转换成方波,再利用单片机对该方波的高低电平分别计数,通过求得占空比得到相位差。对不同频率的输入信号,采用不同的计数信号进行多周期、多次测量求平均的计数方法。该方案的有效测量频域范围:1～100kHz,最终实验电路达到的精度为0.1度。A design of digital phase detector based on MCU is introduced in the thesis. The main thought is： with the cross-zero detecting and XOR circuits, the phase difference of the two input sine signals are converted into pulse signal. Then the phase difference is calculated by using the MCU to count the duty cycle of the pulse. As for input signal in different frequency, the final result is acquired through multi-period, multi-time measuring with specific counting signal. The effective frequency range of this system is 1 -100kHz and the experimental accuracy is 0.1°.

关 键 词：相位差 单片机 占空比 

分 类 号：TM930[电气工程—电力电子与电力传动]