Common mode filter

Abstract

The invention is applicable to the field of electronic elements and provides a common mode filter, which comprises a first insulation layer, a second insulation layer, a third insulation layer, a fourth insulation layer, a fifth insulation layer, a sixth insulation layer, a first medium layer, a second medium layer, a third medium layer, a fourth medium layer, a first conductor, a spiral second conductor, a spiral third conductor, a fourth conductor, a first lead-out electrode, a second lead-out electrode, a third lead-out electrode and a fourth lead-out electrode, wherein the first conductor and the second conductor form a first coil; the fourth conductor and the third conductor form a third coil; and the magnetic lines of force passing through the first and second coils are parallel to the ground. In the common mode filter of the invention, a medium layer made of a composite material is printed or cast between the first and second coils, so the coefficient of coupling between the electrodes increases; meanwhile, the magnetic lines of force are parallel to the ground, the parasitic capacitance is small, the resonant frequency is improves and the inhibition effect on common mode interference is desirable.

Description

technical field [0001] The invention belongs to the field of electronic components, in particular to a common mode filter. Background technique [0002] figure 1 The structure of the common-mode filter provided by the prior art is shown, which is made in a coplanar manner. The coupling coefficient between electrodes in this common-mode filter is small; in order to solve the problem of small coupling coefficient between electrodes, The existing technology proposes a common-mode filter made by stacking up and down. Although the coupling coefficient between the electrodes in this common-mode filter is large, the parasitic capacitance is relatively large because the magnetic field lines are perpendicular to the ground, so resulting in a relatively low self-resonant frequency. Contents of the invention [0003] The purpose of the embodiments of the present invention is to provide a common-mode filter, aiming to solve the problem that the existing common-mode filter is made in...

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Problems solved by technology

[0003] The purpose of the embodiments of the present invention is to provide a common-mode filter, aiming to solve the problem that the existing common-mode filter is made in a planar manner, resulting in a small coupling coefficient between electrodes and the self-resonant frequency is low due to the up-and-down stacking method. question

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