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A Measuring Method of Electric Signal Phase Difference

A measurement method and electrical signal technology, applied in the phase angle between voltage and current, measuring device, measuring electrical variables and other directions, can solve the problem of inaccurate electrical signal measurement accuracy, achieve clear physical concepts, increase the amount of calculation, The effect of improving the anti-interference ability

Active Publication Date: 2017-12-12
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 measuring the phase difference of the electric signal in view of the inaccurate measurement accuracy of the phase difference of the electric signal in the prior art

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  • A Measuring Method of Electric Signal Phase Difference
  • A Measuring Method of Electric Signal Phase Difference
  • A Measuring Method of Electric Signal Phase Difference

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Embodiment Construction

[0024] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0025] The method of the present invention is to first initialize the integrator, make the output voltage of the integrator return to zero, perform analog integration according to the calculated integration start time, record the integration start time, stop the integration when the integrator output voltage returns to zero again, and record Integral end time, the zero-crossing point of the electrical signal is calculated from the integral start time and the integral end time, and the period of the electrical signal is calculated from a series of zero-crossing points of the electrical signal. Finally, according to the difference between the zero-crossing time of different signals and the signal period, the phase difference between the acquired signals is calculated.

[0026] In order to obtain more accurate measurement results, the recommended sele...

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Abstract

The invention discloses a method for measuring the phase difference of electrical signals. Firstly, the integrator is initialized to return the output voltage of the integrator to zero, and the integration start time is simulated according to the calculation, and the integration start time is recorded. Stop integration when returning to zero, record the end time of integration, calculate the zero-crossing point of the electrical signal from the integration start time and the integration end time, and calculate the period of the electrical signal from a series of zero-crossing points of the electrical signal. Finally, according to the difference between the zero-crossing time of different signals and the signal period, the phase difference between the acquired signals is calculated. The invention does not need to convert low-frequency signals into square waves, overcomes the disadvantage of poor anti-interference ability of traditional zero-crossing detection, and is especially suitable for phase difference measurement of low-frequency signals. Strong; simple and reasonable to implement, accurate and reliable data, and broad application prospects.

Description

technical field [0001] The invention relates to a method for measuring the phase difference of electric signals, which can also be used for measuring the phase difference of other low-frequency signals, and belongs to the technical field of signal detection. Background technique [0002] In daily life and production process, it is often necessary to measure the phase difference of 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, so as to obtain the phase difference of the two signals, but this algorithm is easy to implement but Requires additional hardware and is susceptible to interference. Contents of the invention [0003] The technical problem to be solved by the present invention is to propose a method for measuring the phase...

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Application Information

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