Novel differential- and common-mode filter inductance structure

Abstract

The invention discloses a novel differential- and common-mode filter inductor structure. The filter inductor structure comprises a first magnetic core, a second magnetic core, a third magnetic core, afourth magnetic core, a first copper strip and a second copper strip, wherein the first magnetic core is attached onto the second magnetic core, a first through hole and a second through hole are simultaneously formed between the first magnetic core and the second magnetic core and communicate with each other via a first air gap, the third magnetic core is attached onto the fourth magnetic core,a third through hole and a fourth through hole are simultaneously formed between the third magnetic core and the fourth magnetic core and communicate with each other via a second air gap, the first copper strip and the second copper strip are used as windings, the first copper strip penetrates through the second through hole and the fourth through hole, and the second copper strip penetrates through the first through hole and the third through hole. The differential- and common-mode filter has the advantages of compact structure, high current through capability and good filtering performance,moreover, filtering characteristics can be configured, and modular expansion can be performed.

Description

technical field [0001] The invention relates to the technical field of inductance elements, and more specifically, the invention is a novel differential common-mode filter inductance structure. Background technique [0002] During the high-frequency switching operation of the switching power supply, serious conducted electromagnetic interference (EMI) will be generated, and EMI will affect the normal operation of other electronic equipment. Therefore, it is necessary to use EMI filters at the input and output of the switching power supply. The main electronic components of an EMI filter include: differential mode inductors and common mode inductors. In order to meet the requirement of a smaller power supply volume, the differential mode inductor and the common mode inductor are often integrated to obtain a differential common mode filter inductor. [0003] At present, the conventional differential common-mode filter inductor structure often uses a ring core. However, the ...

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Problems solved by technology

[0005] In order to solve the problems that existing filter inductors with ring magnetic core structure cannot be applied to high current occasions, need additionally set up a magnetic permeable layer, have poor consistency and high production costs, the present invention innovatively provides a novel differential common-mode filter inductor structure , completely abandoning the limitations of the traditional toroidal core structure, and adopting a structure in which four cores are pasted in pairs to form a through hole for the copper strip (winding) to pass through, and realize the way of optimizing the differential common mode filter inductance structure Effectively solve many problems existing in the prior art

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