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Soft separation method of conducted electromagnetic interference noise based on blind signal processing technology

A technology of conducted electromagnetic interference and blind signal processing, which is applied in the direction of measuring electricity, measuring electrical variables, spectrum analysis/Fourier analysis, etc., to achieve the effect of improving separation accuracy, low separation cost and good practicability

Inactive Publication Date: 2010-08-11
NANJING UNIV OF POSTS & TELECOMM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the defects of the electromagnetic interference noise mode separation method in the background technology, the present invention proposes a soft separation method of conducted electromagnetic interference noise by using an oscilloscope and a current probe to measure conducted interference and combining blind signal processing technology

Method used

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  • Soft separation method of conducted electromagnetic interference noise based on blind signal processing technology
  • Soft separation method of conducted electromagnetic interference noise based on blind signal processing technology
  • Soft separation method of conducted electromagnetic interference noise based on blind signal processing technology

Examples

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Comparison scheme
Effect test

Embodiment 1

[0073] Simulation experiment of soft separation method based on blind signal processing. In this experiment, the signal generator is used to simulate the conduction electromagnetic interference noise, the signal is collected through the induction of the current probe, and the soft separation process is performed to verify that the method of the present invention can separate the mixed signal. Such as image 3 As shown, Tektronix dual-channel signal generators are used as signal sources 1 and 2, three 0° power splitters / mixers and one 180° power splitter from mini-circuit are used as signal distribution and synthesis equipment, and Tektronix Co. The dual-trace oscilloscope TDS 2022 is used as a time domain signal receiving device.

[0074] During the experiment, adjust the signal generator so that signal source 1 outputs an 8MHz signal to the 0° power divider, and signal source 2 outputs a 5MHz signal to the 180° power divider. The waveforms of the two signal sources are as fo...

Embodiment 2

[0078] In order to verify the practicability of the soft separation method of conducted electromagnetic interference noise, the following experiments were carried out. experiment such as figure 2 As shown, the EMI noise source of the device under test adopts Boost switching power supply, two current probes from Rohde Schwarz and A.H.System Inc. are used as measurement equipment, and TDS 2022 dual trace oscilloscope from Tektronix is ​​used as time domain signal The receiving device performs synchronous sampling, and the measured induction mixed signal I O1 (t), I O2 (t) if Figure 6 shown. to me O1 (t), I O2 (t) Compensate the spectrum characteristics of the current probe first, and then perform soft separation to obtain the following Figure 7 Estimated results for common-mode and differential-mode noise sources shown waveform. Then, using the Figure 8 The common mode filter circuit with CHOKE as the core shown is measured as Figure 9 The differential mode ref...

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Abstract

The invention discloses a soft separation method of conducted electromagnetic interference noise based on a blind signal processing technology, belonging to the field of conducted electromagnetic interference noise inhibition. The method comprises the following steps of: carrying out probe frequency spectrum estimation and compensation on two current probes; simultaneously measuring electromagnetic interference noise time domain signals on a live wire and a middle wire of an electronic system by the two current probes and a double-trace oscilloscope; carrying out blind separation on electromagnetic interference noise by utilizing a Fast ICA (Independent Component Analysis) algorithm in a blind signal processing method to obtain a signal source vector estimation value; and finally, judging the property of separation signals based on the maximum cross correlation coefficient of blind separation signals and common mode or differential mode reference signals. The invention overcomes the defects of using a radiofrequency transformer or a power divider to carry out hard separation on common mode noise and differential mode noise, has the advantages of high separation accuracy and favorable practicability, and lowers the cost.

Description

technical field [0001] The invention relates to a soft separation method of conductive electromagnetic interference noise based on blind signal processing in electromagnetic compatibility technology, and belongs to the field of suppression of conductive electromagnetic interference noise. Background technique [0002] As a large number of conducted electromagnetic interference problems continue to appear in reality and have not been well resolved, and electromagnetic compliance testing is enforced in various countries, in order to effectively suppress conducted electromagnetic interference noise, it is very necessary to separate the noise modes of. [0003] Conducted electromagnetic interference noise includes common-mode noise and differential-mode noise. Since common-mode and differential-mode noise have different mechanisms, it is necessary to adopt different suppression methods and design corresponding filter networks. In the measurement of interference noise, how to re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/16G01R31/00
Inventor 邱晓晖褚家美董颖华颜伟陆婋泉吴丹宁平云娟
Owner NANJING UNIV OF POSTS & TELECOMM
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