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Method and device for calculating true RMS

A technology of true effective value and AC signal, which is applied in the field of calculation of true effective value, can solve the problems of large signal measurement error and instability, and achieve the effect of high precision, good stability and small harmonic influence

Pending Publication Date: 2021-12-31
CHONGQING HUAHONG INSTR
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  • Abstract
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  • Claims
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Problems solved by technology

[0003] At present, many instruments often use the peak value calculation method or the average value method to calculate the effective value, and there are problems of large error and instability in the measurement of signals with waveform distortion or large harmonic content.

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  • Method and device for calculating true RMS
  • Method and device for calculating true RMS
  • Method and device for calculating true RMS

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Embodiment Construction

[0022] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below through specific implementation methods in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0023] In one embodiment, such as figure 1 As shown, a method for calculating the true effective value is provided, including the following steps:

[0024] Step S101, setting the analog-to-digital converter in the automatic continuous conversion mode, and setting the corresponding conversion frequency.

[0025] Specifically, the analog-to-digital converter is set to the automatic continuous conversion mode, and the corresponding conversion frequency is set, for example, the conversion frequency is 12.5 kHz, which is convenient for subsequent continuous sampling of the meas...

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Abstract

The invention provides a method and device for calculating a true RMS; the method comprises the steps: setting an analog-to-digital converter to be in an automatic continuous conversion mode, and setting a corresponding conversion frequency; according to the Nyquist sampling theorem, carrying out high-speed sampling on the measured signal and the internal signal through an analog-to-digital converter, and obtaining an external alternating current signal and an internal voltage signal; calculating an AC signal value according to the external AC signal and the internal voltage signal; and carrying out integral calculation according to the alternating current signal value by combining a thermal equivalence principle to obtain a voltage true RMS. A low-cost scheme can be adopted, the true RMS is calculated according to an integral method, the stability is good, and the precision is high.

Description

technical field [0001] The invention relates to the technical field of power signal measurement, in particular to a method and device for calculating true effective value. Background technique [0002] The true effective value is the basic measure of the AC signal, which can reflect the thermal effect caused by the current flowing through the problem, and has practical application value. The true RMS value of the AC signal is specified according to the thermal effect of the current. Let an AC current and a DC current pass through resistors with the same resistance value. If the heat generated in the same time is equal, then the value of this DC current is called this. The effective value of an alternating current. [0003] At present, many instruments often use the peak value calculation method or the average value method to calculate the effective value, and there are problems of large error and instability in the measurement of signals with waveform distortion or large ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/02
CPCG01R19/02
Inventor 李平冯绍勇
Owner CHONGQING HUAHONG INSTR
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