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
CN101383554AInactive Publication Date: 2009-03-11XI AN JIAOTONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
XI AN JIAOTONG UNIV
Publication Date
2009-03-11
Estimated Expiration
Not applicable · inactive patent

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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.
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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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