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Single-channel conducted-electromagnetic-interference-noise separation method

A technology for conducting electromagnetic interference and noise separation. It is used in the measurement of interference from external sources, measurement of electricity, measurement of electrical variables, etc., to save economic costs, overcome synchronous measurement errors, and reduce separation performance.

Inactive Publication Date: 2016-07-27
SOUTHEAST UNIV
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Problems solved by technology

[0005] In order to overcome the shortcomings of the existing conductive EMI electromagnetic noise difference common mode separation network, the present invention provides a software separation method based on blind source separation theory. The method specifically adopts the following technical solutions:

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Embodiment Construction

[0054] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0055] see figure 1 , the RF current probe measures the mixed signal of the live wire (L) and the neutral wire (N) of the power supply, and the line impedance stabilization network can measure the conducted EMI noise, then the noise current i on the L and N wires L (t), i N (t) are respectively:

[0056] i L (t)=i CM (t)+i DM (t)

[0057] i N (t)=i CM (t)-i DM (t)

[0058] Among them, i DM (t) and i CM (t) is the differential mode and common mode current of conducted EMI noise, i L (t), i N (t) The frequency domain formula is:

[0059] j 1 i L (t)=ri O1 (ω)

[0060] j 2 i N (t)=ri O2 (ω)

[0061] Among them, i O1 &i O2 Sensing for the probe i L (t)&i N (t) current; M 1 &M 2 The mutual inductance between the probe and the live wire & the neutral wire; r=50Ω is the characteristic impedance of the digital oscilloscope...

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Abstract

The invention discloses a single-channel conduction electromagnetic interference noise separation method, using continuous wavelet transform and FastICA blind source separation EMI noise difference common-mode separation strategy, the implementation steps include: A, using CWT for L-line or N-line observation signals Implement virtual channel expansion; B. Use the improved FastICA algorithm to implement blind source separation for the extended signal to obtain differential common-mode noise separation signals; C. Evaluate the separation ability of differential common-mode noise signals and perform amplitude correction. Although the separation performance of the method is lower than that of the dual channel, it only uses half of the observation information, overcomes the dual channel synchronous measurement error, and saves economic costs, and has potential application value in the field of industrial EMI noise difference common mode separation.

Description

technical field [0001] The invention relates to a software separation method for conduction electromagnetic interference noise, in particular to a single-channel conduction electromagnetic interference noise separation method. Background technique [0002] Conducted electromagnetic interference (EMI) noise is divided into differential mode (DM) interference noise and common mode (CM) interference noise. The former is mainly related to electromechanical switching action; the latter is mainly caused by voltage pulsation. The linear impedance stabilization network can only detect mixed noise signals, so when the equipment does not meet the conducted electromagnetic interference standards, it is necessary to implement mode separation for EMI noise for noise suppression. [0003] EMI noise separation is divided into hardware separation and software separation. The former relies on core devices such as radio frequency transformers and power dividers / combiners, while the latter us...

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Application Information

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IPC IPC(8): G01R23/16G01R31/00
CPCG01R23/16G01R31/001
Inventor 严如强沈飞侯博瑞陶红兴周梦杰
Owner SOUTHEAST UNIV
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