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Common mode/differential mode electromagnetic interference noise separating network

An electromagnetic interference and noise separation technology, which is applied to the AC network to reduce harmonics/ripples, circuits, electrical components, etc., can solve the problems of high requirements and long time for the production process of the noise separation network, and achieve easy selection, Create simple, small value effects

Inactive Publication Date: 2009-03-11
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, many scholars at home and abroad have proposed a variety of methods for separating differential and common mode noise, but none of them can fully guarantee that the input impedance remains at 50Ω, and the production process of the noise separation network has high requirements and takes a long time

Method used

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  • Common mode/differential mode electromagnetic interference noise separating network
  • Common mode/differential mode electromagnetic interference noise separating network
  • Common mode/differential mode electromagnetic interference noise separating network

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Embodiment Construction

[0025] refer to figure 1 , the common-mode / differential-mode noise separation network of the present invention includes external connection ports Port1 to Port4 during use, two transmission line transformers, one of which is the first transmission line transformer T that can realize 4:1 impedance conversion 1 , the function it realizes is a power synthesizer, through which the common mode noise signal can be obtained at Port3. The other is the second transmission line transformer with a ratio of 1:1, which can block the common-mode noise signal from passing, and get the differential-mode noise signal at Port4. In addition, the network also requires two compensation capacitors and the necessary resistors, where the resistor R CM and R DM It is the internal impedance of the spectrum analyzer, both are 50Ω. The first resistor R 1 with R CM in parallel thus passing the 4:1 first transmission line transformer T 1 The resistance value between Port1 and Port2 after the function...

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Abstract

The invention belongs to the research field of power electron and electromagnetic interference and discloses a common mode / differential mode noise discrimination network. The network comprises two line transformators which are in parallel connection, the driving point impedances of the two line transformators are both100 omegas so that Zin1=Zin2=50 omega is precisely guaranteed and the network can better play the role of the frequency bandwidth of the line transformators; meanwhile, a compensation capacitor is added to ensure that the driving point impedances of the common mode / differential mode noise discrimination network are kept within 50 omegas. The common mode / differential mode noise discrimination network can reach impedance matching of separate meshes, realizes that the network always keeps the characteristic impedance of 50 omegas in the 30 MHz broad band, and can be applied to various common mode / differential mode separations which can conduct electromagnetic noise.

Description

technical field [0001] The invention belongs to the field of power electronics electromagnetic interference research and relates to a common-mode / differential-mode electromagnetic interference noise separation network. Background technique [0002] At the same time that power electronic devices are widely used and developed rapidly, electromagnetic compatibility issues are gradually being paid attention to. In power electronic devices, electromagnetic interference is mainly transmitted through conduction. Conducted interference can be divided into common mode noise (CM Noise) and differential mode noise (DMNoise) according to the different interference modes. Because of the different nature of these two types of noise, separate measurements must be made for the common-mode and differential-mode components. However, the linear impedance stabilization network (LISN) of the current conducted interference measurement equipment measures the mixed signal of the two. Noise separ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/12H02J3/01H01F30/00
CPCY02E40/40
Inventor 陈文洁杨帆杨旭王兆安
Owner XI AN JIAOTONG UNIV
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