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A method, system and sampling device for automatic detection of zero-crossing point of fundamental wave voltage

A technology of zero-crossing voltage and fundamental wave voltage, which is applied in measuring devices, measuring current/voltage, measuring electrical variables, etc., can solve problems such as complex circuits and poor anti-interference, and achieve low hardware cost, high precision, and improved accuracy Effect

Active Publication Date: 2022-03-25
浙江南德电气制造有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the defects of poor anti-interference and complex circuits in the existing zero-crossing detection circuit, the present invention proposes a high-precision AC voltage with strong anti-interference based on the existing voltage detection circuit and applied in a single-chip microcomputer with ADC function Zero-crossing detection method

Method used

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  • A method, system and sampling device for automatic detection of zero-crossing point of fundamental wave voltage
  • A method, system and sampling device for automatic detection of zero-crossing point of fundamental wave voltage
  • A method, system and sampling device for automatic detection of zero-crossing point of fundamental wave voltage

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Embodiment 1

[0120] Embodiment 1: as figure 1 It is a standard 50Hz voltage sampling waveform diagram, and there are front and rear sampling points at the zero crossing point of the waveform. Such as figure 2 Shown is an enlarged view of the front and rear sampling points at the zero crossing point of the waveform, and the sampling numbers are Xn, Xn+1;

[0121] Embodiment 1 is used to calculate the zero-crossing point under the following conditions: the fundamental wave voltage sine wave zero-crossing point; after the fundamental wave voltage sine wave superimposes the notch wave, its positive zero-crossing point and reverse zero-crossing point quantity in the sampling period are the same as the fundamental wave sine wave The same; after the fundamental sine wave is superimposed with harmonics, the number of positive zero-crossing points and reverse zero-crossing points in the sampling period is the same as that of the fundamental sine wave.

[0122] Step 1: Based on Figure 9 It can ...

Embodiment 2

[0147] Embodiment 2 is the same as step 1-step 5 of embodiment 1, and step 6 is changed.

[0148] Such as image 3 The waveform diagram of the three cycles after superimposing the notch wave for the 50Hz fundamental voltage sine wave.

[0149] t1~t3: From the zero point of the positive half cycle of the previous fundamental voltage sine wave or notch wave zero point at the zero point of the positive half cycle of the fundamental voltage sine wave to the next zero point of the positive half cycle of the fundamental voltage sine wave or the fundamental voltage sine wave The time period of the notch zero crossing at the positive half cycle zero crossing.

[0150] f1~f3: From the zero point of the negative half cycle of the previous fundamental voltage sine wave or the notch zero point at the zero point of the negative half cycle of the fundamental voltage sine wave to the next zero point of the negative half cycle of the fundamental voltage sine wave or the fundamental voltage s...

Embodiment 3

[0168] Such as Figure 7 It is the three-period waveform diagram after the 50Hz fundamental voltage sine wave superimposes harmonics, and the zero-crossing sampling point is marked.

[0169] When the 50Hz fundamental voltage sine wave is superimposed with harmonics, the number of forward voltage zero-crossing point arrays and reverse voltage zero-crossing point arrays within the sampling period is the same as that of the fundamental voltage sine wave using the method in Embodiment 1 for calculation.

[0170] This embodiment is used to calculate the case where the number of forward voltage zero-crossing point arrays and reverse voltage zero-crossing point arrays within the sampling period after the 50Hz fundamental voltage sine wave is superimposed with harmonics is greater than that of the fundamental voltage sine wave.

[0171] t1~t3: the time period from the harmonic zero-crossing point at the zero-crossing point of the positive half cycle of the previous 50Hz fundamental wa...

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Abstract

A method, system and sampling device for automatic detection of fundamental voltage zero-crossing points, including sampling AC signals through a single-chip microcomputer; sampling at least two cycles, obtaining a number of sampling points, marking each sampling point and the plane coordinates of the sampling points; Compare two adjacent sampling points with the reference value to determine whether the sampling point is a zero-crossing point, and then judge whether it is a forward zero-crossing or a reverse zero-crossing, and obtain the zero-crossing point array Zn; use this zero-crossing point array Zn to represent the plane graphic meaning of the zero-crossing point . Judging the zero-crossing point array according to the periodic function characteristics of the sampling waveform, and eliminating the interference zero-crossing point array; by finding the zero-crossing point array of the fundamental voltage sine wave within at least two sampling periods or the notch at the zero-crossing point of the fundamental voltage sine wave Zero-crossing point array or harmonic zero-crossing point array, calculate the zero-crossing point array of the next period. The invention proposes a method for sampling and detecting zero-crossing points by using a single-chip microcomputer with ADC function, which has strong anti-interference performance and high precision.

Description

technical field [0001] The invention relates to the field of zero-crossing detection of AC grid voltage, in particular to a method, system and sampling device for automatic detection of grid voltage zero-crossing point. Background technique [0002] AC grid voltage zero-crossing detection refers to the detection of the zero-crossing moment by the application of electronic circuits when the voltage waveform transitions from positive half cycle to negative half cycle or from negative half cycle to positive half cycle in a sinusoidal AC system. detection. The existing commonly used detection circuit is to use the photoelectric isolation of the optocoupler and the zero-crossing forward conduction characteristics to realize the detection of the zero-crossing signal. [0003] In practical applications, due to background noise factors such as power grid voltage notch and harmonic interference, the input signal usually jitters, traps, and severely distorts the waveform near the zer...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/175
CPCG01R19/175
Inventor 郑坚王奔陈潇刘维城戴珏珺
Owner 浙江南德电气制造有限公司
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