A Measuring Method of Instantaneous Phase of Electric Signal
A technology of instantaneous phase and measurement method, which is applied to the phase angle between voltage and current, measuring devices, and measuring electrical variables, etc., can solve the problem of inaccurate measurement of instantaneous phase of electrical signals, etc., and achieve clear physical concepts and calculations The effect of increasing the quantity and improving the anti-interference ability
Active Publication Date: 2017-12-12
NANJING UNIV OF POSTS & TELECOMM
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[0003] The technical problem to be solved by the present invention is that the measurement accuracy of the instantaneous phase of the electrical signal in the prior art is not accurate enough, and a measurement method of the instantaneous phase of the electrical signal is proposed. Compared with the traditional zero-crossing method, the measurement accuracy, Inventions such as anti-interference have been greatly improved
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[0026] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:
[0027] The method of the present invention is to first initialize the integrator, make the output voltage of the integrator return to zero, carry out analog integration according to the calculated integration start time, record the integration start time, stop the integration when the output voltage of the integrator returns to zero again, and Stop integration when the output voltage of the device returns to zero again, record the integration end time, calculate the zero-crossing point of the electrical signal from the integration start time and integration end time, and calculate the period of the electrical signal from a series of zero-crossing points of the electrical signal. Then, the current instantaneous phase is calculated according to the time of the zero-crossing point of the electrical signal in the previous period, the predicted period of...
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The invention discloses a method for measuring the instantaneous phase of an electric signal. Firstly, the integrator is initialized to return the output voltage of the integrator to zero, and the analog integration is performed according to the calculated integration start time, 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; The current instantaneous phase is calculated from the time of zero, the predicted period of the current cycle, and the current time. The invention does not need to convert the electrical signal into a square wave, overcomes the disadvantage of poor anti-interference ability, and is especially suitable for the measurement of alternating current. Interference and other aspects have been greatly improved.
Description
technical field [0001] The invention relates to a method for measuring the instantaneous phase of an electric signal, which is also suitable for measuring the instantaneous phase of a low-frequency sinusoidal signal. Background technique [0002] In daily life and production process, it is often necessary to measure the instantaneous phase of electrical signals. The more accurate the measured instantaneous phase is, the better the application effect is. In the existing instantaneous phase measurement methods, most of them use the traditional zero-crossing method to measure the instantaneous phase of a certain signal. This algorithm is easy to implement, but it is easily affected by interference, which makes the measurement accuracy low. Contents of the invention [0003] The technical problem to be solved by the present invention is that the measurement accuracy of the instantaneous phase of the electrical signal in the prior art is not accurate enough, and a measurement m...
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IPC IPC(8): G01R25/00
Inventor 戴尔晗
Owner NANJING UNIV OF POSTS & TELECOMM