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Method for measuring phase difference of alternating-current electric signals quickly

A technology for alternating current and electrical signals, which is applied in the measurement of electrical variables, the phase angle between voltage and current, and measuring devices. The effect of improving the accuracy of random errors and calculations

Inactive Publication Date: 2011-06-15
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to propose a method for quickly measuring the phase difference of the AC signal in view of the inaccurate measurement accuracy of the phase difference of the AC signal in the prior art

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  • Method for measuring phase difference of alternating-current electric signals quickly
  • Method for measuring phase difference of alternating-current electric signals quickly
  • Method for measuring phase difference of alternating-current electric signals quickly

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Embodiment Construction

[0034] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:

[0035] The essence of the invention is to directly calculate the zero-crossing point of the signal after preprocessing several sampling points; and then calculate the period of the signal and the phase difference between different signals by a series of zero-crossing points. The selection of sampling points should not be too many, if more sampling points are selected, the calculation will be more complicated; the selection of sampling points should not be too small, if the selection of sampling points is 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.

[0036] In order to obtain more accurate measurement results, the suggested selection scheme of sampling points is: the number of positive sampling points is equal or approximatel...

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Abstract

The invention provides a method for measuring the phase difference of alternating-current electric signals quickly, which comprises the following steps of: firstly, pretreating a sampling value; secondly, calculating the zero crossing point time of two or multiple paths of alternating-current electric signals during change from low to high directly; thirdly, calculating the period of the signals by using zero crossing points; and finally, calculating the phase difference among the signals by using the difference of the zero crossing point time of different signals and the signal period. In the method, the alternating-current electric signals are not needed to be converted into a square wave, and the defect of poor anti-interference capacity in the conventional zero crossing point detection is overcome. The method is also suitable for measuring the phase difference of low-frequency signals, a system is convenient to detect, and low hardware expenditures are realized; the anti-interference capacity of the system is high; and the method is realized simply and reasonably, has accurate and reliable data, and has a wide application prospect.

Description

technical field [0001] The invention relates to a phase difference measurement method of alternating current signals, and the invention can also be used for phase difference measurement of low frequency signals. Background technique [0002] In daily life and production process, it is often necessary to measure the phase difference between AC signals. The more accurate the measured phase difference is, the better the application effect is. In the existing phase difference measurement methods, most of them convert the signal into a square wave, and then measure the time difference between the rising edges of the two square waves to obtain the phase difference of the two signals. This method is easy to implement but requires Additional hardware and are susceptible to interference. What the industry needs is a software phase difference measurement method with a small amount of computation and certain measurement accuracy. Contents of the invention [0003] The technical pro...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R25/00
Inventor 戴尔晗
Owner NANJING UNIV OF POSTS & TELECOMM
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