提高过零点检测精度的方法  

The method to improve the zero-crossing detection accuracy

作　　者：田萍果[1] 毕雪芹[2] 

机构地区：[1]西安工业大学北方信息工程学院,陕西西安710025 [2]西安工业大学,陕西西安71003

出　　处：《电子设计工程》2014年第20期122-123,127,共3页Electronic Design Engineering

摘　　要：为提高过零点检测精度,减小漏电保护器的拒动作和误动作,本文介绍了过零点检测的基本原理,理论论述零点检测误差存在的原因,提出一种新的过零点检测方法;给出电路设计图及仿真结果。经验证,该电路将过零检测的时间误差减小到了6.423μs,大大提高漏电保护的可靠性和有效性,同时也可以应用于工频检测,谐波分析等。To improve the zero-crossing detection accuracy,reduce leakage protection actions and refuse to malfunction, this paper introduces the basic principles of the zero crossing detection and theoretically discusses the reason for the existence of detection errors. A new zero-crossing detection method is proposed and its design circuit and simulation results are given.Being Proved, the zero-crossing detecting circuit will reduce the error detection time to 6.423 μs, greatly improving the reliability and validity of leakage protection, which can be applied to detect the frequency, harmonic analysis and so on.

关 键 词：过零点 检测精度 专用过零比较器 MULTISIM 

分 类 号：TN710[电子电信—电路与系统]