Synchronous Sampling Clock Generation Method and Power Quality Analyzer

Abstract

The embodiment of the invention provides a power quality analyzer, a synchronous sampling clock generation circuit and a synchronous sampling clock generation method. The synchronous sampling clock generation circuit comprises a programmable logic unit and an analog phase-locked loop unit, and the programmable logic unit and the analog phase-locked loop unit are cascaded, wherein the programmable logic unit is used for carrying out first-stage frequency multiplication on an input reference clock, the analog phase-locked loop unit is used for carrying out second-stage frequency multiplication on the output of the programmable logic unit, and the programmable logic unit and the analog phase-locked loop unit are cascaded to carry out the predetermined frequency multiplication on the input reference clock. According to the embodiment of the invention, the characteristics that high tracking speed can be realized by a digital frequency multiplication circuit and precise frequency multiplication can be realized by the analog phase-locked loop unit are utilized, and high frequency multiplication times and quick tracking performance can be synchronously realized after the digital frequency multiplication circuit and the analog phase-locked loop unit are cascaded.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of power quality analysis, and in particular to a power quality analyzer and a method for generating a synchronous sampling clock thereof. Background technique [0002] The power grid of the power supply system illuminates the whole world, and various countries and regions have built huge and complex power grids. In order to ensure the normal and stable operation of the power grid, it is necessary to monitor the power quality in the power grid in real time, thus putting forward the demand for power quality analysis. Power quality refers to the degree of quality of the power signal in the power grid. The ideal power signal is a standard sine wave, and the degree to which the main indicators such as the amplitude, frequency, and waveform distortion of the actual power signal deviate from the standard sine wave is the power quality. IEC (International Electrotechnical Commission) stipulat...

AI Technical Summary

Problems solved by technology

[0011] Its limitation is that the principle of realizing synchronous sampling is consistent with that of the analog phase-locked loop. When realizing a high multiplier, there are also problems such as large output clock phase jitter, narrow synchronization range, and slow follow-up locking speed.

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