Frequency tracking power frequency digital filtering method

A technology of digital filtering and frequency tracking, which is applied in the direction of digital technology network, automatic power control, impedance network, etc., can solve the problems of limited application range, no solution given, large amount of calculation, etc., achieve real-time simplicity and improve real-time Sexuality and cost reduction effect

Inactive Publication Date: 2007-06-06
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

In 1975, Bernard Window et al. proposed the linear least square estimation (LMS) algorithm. Its shortcoming is that for the A/D process of the power signal and its higher harmonics, A/D converters are required respectively. In addition to the power frequency and its second harmonic, four A/D converters are required, and the amount of calculation is large at the same time
Since the origin is also a zero point of the filter, the filter will filter out the DC component of the signal, which can be used in the process of extracting bioelectrical signals such as ECG, because the low frequency component will be extracted from a certain To a certain extent, it can cause interference phenomena such as baseline drift, but it is not suitable for situations where slowly changing signals need to be retained, so its application range is limited to a certain extent
[0004] Through literature retrieval of the prior art, it was found that Wang Zhizhong et al.

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  • Frequency tracking power frequency digital filtering method
  • Frequency tracking power frequency digital filtering method
  • Frequency tracking power frequency digital filtering method

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Embodiment Construction

[0028] An embodiment of the present invention is described in detail below: this embodiment is implemented under the premise of the technical solution of the present invention, has provided detailed implementation and specific operation process, but protection scope of the present invention is not limited to the following Example.

[0029] The entire filtering process of this embodiment is that the central processing unit controls the analog-to-digital conversion chip to use the 8 times frequency of the power frequency as the sampling frequency to sample and quantify the signal, and then use the comb filter algorithm or adaptive filter algorithm to realize the power frequency and its multiples. The frequency notch is finally controlled by the central processing unit to output the filtered signal.

[0030] In this embodiment, most of the components can be replaced by other products with similar functions. For example, the phase-locked loop chip can be replaced by various common p...

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Abstract

A method for filtering power frequency digit by frequency-tracking includes switching power frequency reference signal into signal input end of phase locked loop, outputting eight frequency multiplier signal of power frequency by said loop when eight frequency division signal of power frequency outputted by central processor is switched into comparison input end of said loop, using said frequency multiplier signal as sampling signal sequence, using comb filtering algorithm to realize trop of power frequency and its frequency multiplier, finally controlling and outputting filtered signal by central processor.

Description

technical field [0001] The invention relates to a digital filtering method, in particular to a power frequency digital filtering method for frequency tracking. It belongs to the technical field of electronic circuits. Background technique [0002] In the detection of industrial measurement and control systems and biomedical signals (such as ECG, EEG, etc.), the detected signal is easily affected by the power frequency interference generated by the surrounding external 50Hz electric and magnetic fields. In severe cases, the effective signal will be overwhelmed by such interference . Therefore, in the detection of various electrical signals, especially biomedical signal detection, suppressing power frequency interference is one of the most important issues. At present, there are many mature methods for eliminating 50Hz power frequency interference signals. The adaptive filter has a strong suppression effect on power frequency interference, and can automatically adjust its s...

Claims

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Application Information

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IPC IPC(8): H03H17/02H03H21/00H03L7/08H03L7/18
Inventor 王志中费俊琳张丹枫
Owner SHANGHAI JIAO TONG UNIV
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