Method for rapidly measuring frequency of alternating-current signals

A signal frequency and alternating current technology, applied in the field of rapid measurement of alternating current signal frequency, can solve the problems of inaccurate measurement accuracy of AC signal frequency and large amount of calculation, and achieve the effect of clear physical concept, improved anti-interference ability, and reduced calculation amount

Inactive Publication Date: 2013-01-02
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0005] The technical problem solved by the present invention is to propose a method for quickly measuring the frequency of an AC signal, which can also be used for Frequency measurement of low-frequency sinusoidal signals with fixed frequency or little frequency variation

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  • Method for rapidly measuring frequency of alternating-current signals
  • Method for rapidly measuring frequency of alternating-current signals
  • Method for rapidly measuring frequency of alternating-current signals

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Embodiment Construction

[0035] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:

[0036] The essence of the present invention is to select several sampling points near the zero point, calculate the average value M and the average sampling occurrence time T of several sampling points, and then calculate and obtain T' according to the characteristics of the current signal and the average value M, by T+T' To approximate the zero-crossing point of the signal, so as to calculate the frequency or period of the signal. The selected sampling points should not be too many, if more sampling points are selected, the computational complexity will be higher; the selection of sampling points should not be too small, if the selected sampling points are less, it will be easily affected by interference. Therefore, users can select a reasonable combination and number of sampling points for calculation according to their needs.

[0037] In order to obta...

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Abstract

The invention provides a method for rapidly measuring the frequency of alternating-current signals, comprising the following steps: sampling measured electric signals; according to the sampling values, selecting a plurality of sampling points adjacent to the zero points of the signals, and calculating the average value and average sampling generation time of the sampling values of the plurality of sampling points; carrying out calculation on characteristics of the current signal and the average value, thus obtaining time used for approximately expressing the zero-passing point of the signal; and according to the zero-passing point, calculating the period or frequency of the measured signal. In the method, the alternating-current signals do not need to be converted into square waves, thus the method is especially suitable for measurement on the frequency of low-frequency sine singles with fixed frequency, the system detection is convenient, and the hardware overhead is less; the system has certain interference resistance; and the implementation is simple and reasonable, and the data is accurate and reliable.

Description

technical field [0001] The invention relates to a method for quickly measuring the frequency of an alternating current signal, which can also be used for frequency measurement of a low-frequency sinusoidal signal with a fixed frequency or little frequency change. Background technique [0002] In daily life and production process, it is often necessary to monitor the frequency of the signal. The more accurate the measured frequency, the better the application effect. In the existing frequency measurement methods for low-frequency signals, the low-frequency signal is first formed into a square wave by a shaping circuit, and the time interval T between two adjacent rising or falling edges of the square wave is detected, and the frequency is obtained by calculating the reciprocal. In addition, there are some methods for measuring frequency by software, such as: zero-crossing method, analytical method, error minimization principle algorithm, DFT algorithm, quadrature demodulation...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/02
Inventor 戴尔晗
Owner NANJING UNIV OF POSTS & TELECOMM
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