CN203311969U

CN203311969U - Double-band common-mode filtering inducer

Info

Publication number: CN203311969U
Application number: CN2013203287979U
Authority: CN
Inventors: 游智良; 陈品榆; 叶秀发
Original assignee: Mag Layers Scientific Technics Co Ltd
Current assignee: Mag Layers Scientific Technics Co Ltd
Priority date: 2013-06-07
Filing date: 2013-06-07
Publication date: 2013-11-27
Anticipated expiration: 2023-06-07

Abstract

The utility model discloses a double-band common-mode filtering inducer which comprises a first iron core, a second iron core, a first coil and a second coil, wherein the first iron core is formed by connecting two first axial branches and two second axial branches in a surrounding manner; the first iron core is made of nickel-zinc; the second iron core is arranged above the first iron core; the second iron core is square-shaped; the second iron core is made of manganese-zinc; the first coil is wound on one sides of both the first iron core and the second iron core at the same time; the second coil is wound on the other sides of both the first iron core and the second iron core at the same time. According to the double-band common-mode filtering inducer, as the second iron core is arranged on the first iron core, the second iron core is square-shaped, and the second iron core is made of manganese-zinc, so that compared with the conventional iron filtering inducer that only one single iron core made of nickel-zinc, the double-band common-mode filtering inducer has a better low-frequency noise prohibition effect, i.e., the double-band common-mode filtering inducer has a good probation effect on both low-frequency noise and high-frequency noise, so that furthermore, the effect that the practicability and applicability of a product are greatly improved is achieved.

Description

Two-band common mode filtering inductance

Technical field

The utility model relates to a kind of common mode filtering inductance, espespecially a kind of common mode filtering inductance that can suppress simultaneously high-frequency noise and low-frequency noise.

Background technology

General common-mode filter, refer to shown in Figure 1, it is mainly on an iron core 10, to be arranged with one first coil 11 and one second coil 12, the end of this first coil 11 and the second coil 12 is connected on the termination electrode 13 of iron core 10, the operating principle of its filtering is to utilize when noise current such as this common-mode filter of common mode current process, this common mode current can produce magnetic field in the same way on the first coil 11 and the second coil 12, thereby can increase the induction reactance (inductive reactance) of this first coil 11 and the second coil 12, and make this common-mode filter show as high impedance, also can produce higher common code impedance (common mode impedance), thereby can decay this common mode current, and then can reach the purpose of filtering common mode noise.

This existing common-mode filter, though can reach the purpose of filtering common mode noise, but it only possesses single iron core 10, and material that should iron core 10 is mainly nickel zinc (Ni-Zn), therefore it only has preferably inhibition to high-frequency noise, please coordinate again to consult and Figure 2 shows that the existing anti-performance diagram of its common mode group of common-mode filter, by the anti-performance diagram of this common mode group, can be found out, existing common-mode filter frequency during lower than 100MHz its impedance just start to decline to a great extent, be also that its ability of inhibition for low-frequency noise is poor, and then cause the product practicality and applicability limited, hereat, how for above-mentioned disappearance, to be improved, be the technical difficulties place that the present utility model people institute wish solves.

Summary of the invention

Because existing common-mode filter, because it only has preferably inhibition to high-frequency noise, cause the product practicality very limited, therefore the purpose of this utility model is to provide a kind of two-band common mode filtering inductance, by the utility model, be provided with this second iron core in the first iron core, and this second iron core is a mouthful word shape, the material of this second iron core is MnZn again, and can have the iron core that only uses single nickel zinc material now, has better inhibition low-frequency noise effect, be also that the utility model all has quite good inhibition for low-frequency noise and high-frequency noise, and then make the utility model can reach the significantly effect of improving product practicality and applicability.

For reaching the above object, the utility model provides a kind of two-band common mode filtering inductance, and it comprises: one first iron core, and this first iron core is enclosed and is formed by two first axial branches and the connection of two second axial branches, and separately the material of this first iron core is nickel zinc; One second iron core, this second iron core are arranged in this first top unshakable in one's determination, and this second iron core is a mouthful word shape, and separately the material of this second iron core is MnZn; One first coil, this first coil are set around a side of this first iron core and the second iron core simultaneously; These the first coil two ends are connected to the first end electrode of the first iron core; One second coil, this second coil are set around the opposite side of this first iron core and the second iron core simultaneously; These the second coil two ends are connected to the second termination electrode of the first iron core.

According to the two-band common mode filtering inductance the utility model proposes, wherein respectively this first end electrode or respectively this second termination electrode lay respectively at bottom the junction of this first axial branch respectively and this second axial branch respectively or side.

According to the two-band common mode filtering inductance the utility model proposes, wherein this first end electrode is provided with the inner fovea part of the shape of falling V, and this second termination electrode also is provided with the inner fovea part of the shape of falling V.

According to the two-band common mode filtering inductance the utility model proposes, wherein in the middle of this second iron core, have one second open-work, the position of this second open-work is corresponding with the position of the first open-work.

Compared with prior art, the beneficial effects of the utility model are:

By the utility model, be provided with this second iron core in the first iron core, and this second iron core is a mouthful word shape, the material of this second iron core is MnZn again, and can have the iron core that only uses single nickel zinc material now, has better inhibition low-frequency noise effect, be also that the utility model all has quite good inhibition for low-frequency noise and high-frequency noise, and then make the utility model can reach the significantly effect of improving product practicality and applicability.

The accompanying drawing explanation

Fig. 1 is the schematic diagram of existing common-mode filter.

Fig. 2 is the anti-performance diagram of existing common mode group.

Fig. 3 is the decomposing schematic representation before the utility model not yet winds the line.

Fig. 4 is combination schematic diagram of the present utility model.

Fig. 5 is the anti-characteristic curve schematic diagram of common mode group of the present utility model.

Description of reference numerals:

Prior art: 10-iron core; 11-the first coil; 12-the second coil; The 13-termination electrode;

The utility model: 3-the first iron core; The axial branch of 31-first; The axial branch of 32-second; 33-the first open-work; 34-first end electrode; The 341-inner fovea part; 35-the second termination electrode; The 351-inner fovea part; 4-the second iron core; 41-the second open-work; 5-the first coil; 6-the second coil.

Embodiment

Refer to shown in Figure 3ly, the utility model provides a kind of two-band common mode filtering inductance, and it comprises:

One first iron core 3, this first iron core 3 is enclosed and is formed by two first

axial branches

31 and 32 connections of two second axial branches, by this, make this first unshakable in one's determination 3 middle one first open-work 33 that is formed with, this first iron core 3 is provided with two first end electrodes 34 and two the second termination electrodes 35 again, more specifically, respectively this first end electrode 34 or respectively this second termination electrode 35 lay respectively at respectively bottom the junction of this first axial branch 31 and this second axial branch 32 respectively or side, separately, this first end electrode 34 can be provided with the inner fovea part 341 of the shape of falling V, this second termination electrode 35 also can be provided with the inner fovea part 351 of the shape of falling V, in addition, the material of this first iron core 3 is nickel zinc (Ni-Zn),

One second iron core 4, please coordinate again consult shown in Figure 4, this second iron core 4 is arranged in this first 3 tops unshakable in one's determination, this second iron core 4 can be a mouthful word shape, also namely in the middle of this second iron core 4, has one second open-work 41, the position of this second open-work 41 is corresponding with the position of the first open-work 33 again, and separately the material of this second iron core 4 is MnZn (Mn-Zn);

One first coil 5, refer to shown in Figure 4ly, and this first coil 5 is set around a side of this first the 3 and second iron core 4 unshakable in one's determination simultaneously, and these the first coil 5 two ends are connected to the first end electrode 34 of the first iron core 3 again;

One second coil 6, this second coil 6 are set around the opposite side of this first the 3 and second iron core 4 unshakable in one's determination simultaneously, and these the second coil 6 two ends are connected to the second termination electrode 35 of the first iron core 3 again, and as shown in Figure 4;

Refer to Fig. 4, shown in Figure 5, by the utility model, be provided with this second iron core 4 in the first iron core 3, and this second iron core 4 is a mouthful word shape, the material of this second iron core 4 is MnZn again, and can have the iron core 10 that only uses single nickel zinc material now, has better inhibition low-frequency noise effect, please coordinate again to consult and Figure 5 shows that the anti-performance diagram of common mode group of the present utility model, by the anti-performance diagram of this common mode group, can be found out, common mode filtering inductance of the present utility model at frequency 0.1MHz between 1000MHz, all keeping suitable impedance, be also that the utility model all has quite good inhibition for low-frequency noise and high-frequency noise, and then make the utility model can reach the significantly effect of improving product practicality and applicability.

Above is illustrative to description of the present utility model; and it is nonrestrictive; those skilled in the art is understood, and within spirit that claim limits and scope, can carry out many modifications, variation or equivalence to it, but they all will fall in protection range of the present utility model.

Claims

1. a two-band common mode filtering inductance, is characterized in that, comprises:

One first iron core, this first iron core is enclosed and is formed by two first axial branches and the connection of two second axial branches, so that be formed with one first open-work in the middle of this first iron core, this first iron core is provided with two first end electrodes and two the second termination electrodes again, and separately the material of this first iron core is nickel zinc;

One second iron core, this second iron core are arranged in this first top unshakable in one's determination, and this second iron core is a mouthful word shape, and separately the material of this second iron core is MnZn;

One first coil, this first coil are set around a side of this first iron core and the second iron core simultaneously, and these the first coil two ends are connected to the first end electrode of the first iron core again;

One second coil, this second coil are set around the opposite side of this first iron core and the second iron core simultaneously, and these the second coil two ends are connected to the second termination electrode of the first iron core again.

2. two-band common mode filtering inductance as claimed in claim 1, is characterized in that, respectively this first end electrode or respectively this second termination electrode lay respectively at bottom the junction of this first axial branch respectively and this second axial branch respectively or side.

3. two-band common mode filtering inductance as claimed in claim 2, is characterized in that, this first end electrode is provided with the inner fovea part of the shape of falling V, and this second termination electrode also is provided with the inner fovea part of the shape of falling V.

4. two-band common mode filtering inductance as claimed in claim 1, is characterized in that, has one second open-work in the middle of this second iron core, and the position of this second open-work is corresponding with the position of the first open-work.