Correlated sinusoidal signal detection method and device

Abstract

The present application discloses a related sinusoidal signal detection method and device, which determines its normal zero-crossing point by sampling the first sinusoidal signal, and determines the first preset interval time after the normal zero-crossing point as the first The extreme moment of the sinusoidal signal, and then determine the instantaneous value of the second sinusoidal signal corresponding to the extreme moment; when there is an interference signal, there must be a peak or valley at the corresponding position, that is, the derivative of the corresponding position satisfies the differential detection method The judgment conditions; and since the application does not directly detect the peaks and troughs, it effectively solves the impact of false peaks and false troughs caused by interference signals on the detection accuracy, and the smoothness of the signal is very low. It can be seen that the application greatly reduces the probability of misjudgment of peaks and troughs, improves the anti-interference ability, improves the accuracy of detection, and reduces the smoothness requirements of the signal. It has good versatility and solves the problems of the prior art. .

Description

technical field [0001] The present application relates to the field of detection technology, in particular to a method and device for detecting a correlated sinusoidal signal. Background technique [0002] Correlated sinusoidal signals are two sinusoidal signals that have the same frequency and the same or different phases. In practical engineering applications, it is usually necessary to detect the instantaneous value of the other signal when one of the two related sinusoidal signals reaches the extreme value (including the peak value and the valley value). For example, for a voltage signal and a current signal with the same frequency in the same circuit, it is necessary to detect the extreme value of the current signal and the instantaneous value of the voltage signal when the extreme value occurs. [0003] In the prior art, the above-mentioned detection process is mainly realized through the differential detection method, that is, the derivative of the current signal is ...

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Problems solved by technology

[0005] In view of this, the purpose of this application is to provide a correlation sinusoidal signal detection method and device to solve the problems of existing differential detection methods that require high signal smoothness, poor anti-interference ability, and large error in detection results

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