具有相位补偿的高精度过零检测方法研究

摘要

A high-precision zero-crossing detection method with phase compensation function was presented,which aims at solving the problem of influencing the detection accuracy due to the high frequency interference and phase delay by traditional method. The analysis of shortcomings and working mechanism of conventional detection is per⁃formed,the improved circuit including low-pass filter of second-order voltage-controlled voltage source and all-pass filter is designed and its working mechanism and frequency domain characteristics are analyzed,while the simula⁃tion and experimental results are displayed. The results show that the method of zero-crossing detection circuit de⁃sign improves the detection accuracy,has the good real-time performance and simplifies the complexity of the fol⁃lowing software design.%针对传统过零检测方法因高频干扰和相位延迟而影响检测精度的问题，提出了具有相位补偿功能的高精度过零检测方法。分析了传统检测方法的工作机理和存在的不足，设计了一种压控电压源型二阶低通滤波器和全通滤波器的改进电路，并对其工作机理和频域特性进行了理论分析，同时给出了仿真及实验结果。结果表明，该方法设计的过零检测电路提高了同步脉冲信号的检测精度，并具有良好的稳定性，简化了后续软件设计的复杂性。