A Broadband Synchronous Sampling Method

A synchronous sampling and wide-band technology, applied in the field of wide-band synchronous sampling, can solve the problems of high cost, low phase-locking accuracy, and inability to lock phases, and achieve the effect of low cost

Active Publication Date: 2020-03-24
惠州市成惠电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the bandwidth of the signal to be tested is wide, using a phase-locked loop circuit will result in a longer phase-locking time, and at the same time reduce the phase-locking accuracy, or even fail to phase-lock
Moreover, when the signal is disturbed by noise, harmonics, interharmonics, etc., the phase-locked loop is prone to "lost lock"
In addition, the hardware circuit of the phase-locked loop is more complicated and the cost is higher

Method used

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  • A Broadband Synchronous Sampling Method
  • A Broadband Synchronous Sampling Method
  • A Broadband Synchronous Sampling Method

Examples

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Embodiment

[0054] figure 2 It is a schematic diagram of wideband synchronous sampling in the present invention.

[0055] In this example, combined with figure 2 , a kind of broadband synchronous sampling method of the present invention is described in detail, specifically comprises the following steps:

[0056] S1. The voltage conditioning / grading module classifies the input voltage to obtain the four-phase voltage U A , U B , U C , U N ;

[0057] S2. Extract any phase voltage as a reference voltage, input it to an anti-aliasing filter, and filter out harmonic components in the reference voltage;

[0058] In this embodiment, the phase A voltage is used as the reference voltage, and the phase A voltage is set as a sinusoidal signal x(t), x(t)=sin(2π*80*t)+0.1*sin(6π*80*t )+0.1*sin(10π*80*t), and then add Gaussian white noise to the signal, the signal-to-noise ratio is 50dB;

[0059] S3. The filtered reference voltage is sampled at a fixed frequency through an ADC module with a b...

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Abstract

The invention discloses a broadband synchronous sampling method. The method includes: performing fixed-frequency sampling on signals at a fixed sampling rate, and performing discrete Fourier transformation on collected data to acquire a discrete spectrum sequence of the signals; finding a spectrum value corresponding to a point with maximum amplitude, using a spectrum zooming method with FFT+FT tozoom spectra around the maximum amplitude, and using a search algorithm through a golden section method plus a Newton method to search the spectrum around the spectrum value corresponding to the point with the maximum amplitude to find an extreme point, wherein frequency corresponding to the extreme point is signal fundamental frequency; controlling synchronous sampling of an ADC through the signal fundamental frequency.

Description

technical field [0001] The invention belongs to the technical field of digital signal processing, and more specifically relates to a broadband synchronous sampling method. Background technique [0002] The calculation of harmonics generally uses a synchronous sampling method to reduce errors caused by spectrum leakage. A commonly used synchronous sampling method is to use phase-locked loop technology. The phase-locked loop synchronization method is widely used in power signal sampling, especially the application of various digital phase-locked loops. [0003] A phase-locked loop can be used to generate an output control signal that is synchronized to an integer multiple of the locked signal. The basic structure of the phase-locked loop is composed of modules such as phase detection, loop filtering, controllable oscillator and frequency division, such as figure 1 shown. [0004] The working principle of the phase-locked loop is that there is a phase difference between the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/25
Inventor 陈凯张杰杨家伟郑晓龙
Owner 惠州市成惠电子科技有限公司
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