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EMI filter based on improved FOSTER high-frequency model and design method thereof

A filter and high-frequency technology, applied in the field of EMI filter and its design based on the improved FOSTER high-frequency model, can solve the problems of insufficient attenuation of EMI filter, interference test, etc.

Active Publication Date: 2021-09-07
MINNAN INST OF SCI & TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide an EMI filter based on the improved FOSTER high-frequency model and its design method, which solves the technology that the EMI filter in the prior art cannot pass the conducted electromagnetic interference test due to insufficient attenuation in the high-frequency band question

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  • EMI filter based on improved FOSTER high-frequency model and design method thereof
  • EMI filter based on improved FOSTER high-frequency model and design method thereof
  • EMI filter based on improved FOSTER high-frequency model and design method thereof

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Embodiment Construction

[0040] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings. It should be noted here that the descriptions of these embodiments are used to help understand the present invention, but are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not constitute a conflict with each other.

[0041] As the first embodiment of the present invention, propose a kind of EMI filter based on improving FOSTER high-frequency model, as figure 1 shown, including: the first common mode inductor L CM1 , the second common mode inductance L CM2 , the first X capacitor C X1 , the second X capacitor C X2 , the third X capacitor C X3 , the first Y capacitor group C Y1 and the second Y capacitor bank C Y2 , the first X capacitor C X1 , the second X capacitor C X2 , th...

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Abstract

The invention discloses an EMI filter based on an improved FOSTER high-frequency model and a design method thereof, and relates to the field of power technology application. The EMI filter comprises a live line branch and a null line branch, wherein the live line branch and the zero line branch are connected with a plurality of X capacitor banks, a plurality of Y capacitor banks and a plurality of common mode inductors, the X capacitor bank is bridged between the live wire branch and the null line branch, the Y capacitor bank is bridged between the live line branch and the null line branch, and the common mode inductor is bridged between the live line branch and the null line branch. According to the technical scheme, due to the fact that the improved Foster network series model structure is adopted, when the EMI filter is tested, the inductance value of the choking coil is reduced, meanwhile, stray capacitance can be remarkably reduced, the impedance high-frequency characteristic of the choking coil is improved, and the EMI filter can effectively suppress electromagnetic interference in the full frequency band.

Description

technical field [0001] The invention relates to the application field of electric power technology, in particular to an EMI filter based on an improved FOSTER high-frequency model and a design method thereof. Background technique [0002] With the continuous maturity of power electronics technology and the gradual promotion of new material devices such as gallium nitride and silicon carbide, the switching frequency and power density of power electronic equipment continue to increase, and the resulting electromagnetic interference problems are also becoming more and more serious. Countries around the world and international organizations have successively promulgated relevant technical specifications, such as CISPR22 proposed by the International Special Committee on Radio Interference CISPR, EN55022 stipulated in European standards, and GB9254 promulgated by my country. [0003] In order to make power electronic equipment pass the relevant conducted electromagnetic interfere...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/44
CPCH02M1/44
Inventor 陈冬冬林燕强许振明吴正炀
Owner MINNAN INST OF SCI & TECH