CN202473480U

CN202473480U - Common-mode filter

Info

Publication number: CN202473480U
Application number: CN 201120546815
Authority: CN
Inventors: 陈品榆; 何蕙茹; 陈美芳; 彭士芳
Original assignee: Mag Layers Scientific Technics Co Ltd
Current assignee: Mag Layers Scientific Technics Co Ltd
Priority date: 2011-12-23
Filing date: 2011-12-23
Publication date: 2012-10-03
Anticipated expiration: 2021-12-23

Abstract

The utility model provides a common-mode filter which comprises an iron core in the shape of 'ri' (ri is a Chinese character, meaning sun), a first coil and a second coil, wherein the iron core is provided with a wire winding part, and further comprises a first electrode, a second electrode, a third electrode and a forth electrode; and the first coil and the second coil are respectively wound on the wire winding part of the iron core. The iron core is in an integrally-molded structure, and the first coil and the second coil are wound on the wire winding part of the iron core, so that the bandwidth characteristic of the common-mode filter provided by the utility model can be greatly enhanced, and the operating frequency range or the bandwidth of the effective filtering of the common-mode filter provided by the utility model is larger. Moreover, the common-mode filter is suitable for high-frequency and high-speed electronic products or other application occasions, so that the common-mode filter provided by the utility model has the functions of enhancing the bandwidth and the product applicability.

Description

Common-mode filter

Technical field

The utility model provides a kind of common-mode filter, and You Zhike promotes the frequency range characteristic, thereby can also be applicable to the electronic product or the application scenario of high-frequency high-speed, and then can reach the common-mode filter that promotes frequency range and product applicability effect.

Background technology

General common-mode filter; See also shown in Figure 1; It is made up of a hollow square 10, one circle drum type, 11,1 first coil 21 unshakable in one's determination unshakable in one's determination and 22 of one second coils; Wherein this circle drum type unshakable in one's determination 11 is arranged in the hollow bulb 12 of this hollow square unshakable in one's determination 10; This hollow square unshakable in one's determination 10 is provided with first electrode 13, second electrode 14, third electrode 15 and the 4th electrode 16 again; This first coil 21 and second coil 22 are set around respectively on this circle drum type unshakable in one's determination 11, and these first coil, 21 two ends connect with first electrode 13 and second electrode 14 of this hollow square unshakable in one's determination 10 respectively, and these second coil, 22 two ends connect with the third electrode 15 and the 4th electrode 16 of this hollow square iron core 10 respectively; The operating principle of its filtering is to utilize when noise electric 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 first coil 21 and second coil 22; Thereby can increase the induction reactance (inductive reactance) of this first coil 21 and second coil 22; And make this common-mode filter show as high impedance; Also can produce higher common code impedance (common mode impedance), then this common mode current of can decaying, 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, vertical because of its core construction for group, still have the gap and make between this hollow square unshakable in one's determination 10 and this circle drum type unshakable in one's determination 11; Cause its frequency range characteristic relatively poor; See also the common code impedance performance diagram of this existing common-mode filter that is shown in Figure 2, can find out that by this common code impedance performance diagram this common-mode filter has begun to decline to a great extent from its impedance of frequency 200MHz; This common-mode filter can't be kept enough common code impedances when also being high frequency; Effectively the operating frequency range or the frequency range of filtering is less to cause it, and then makes the applicability of this existing common-mode filter very limited, and historical facts or anecdotes has improved necessity.

The utility model content

Because existing common-mode filter; Vertical because of its core construction for group, cause its frequency range less, so the purpose of the utility model is to provide a kind of common-mode filter; This day the font iron core structure that is formed in one; And this day font is arranged with first coil and second coil on the unshakable in one's determination winding section, thereby can significantly promote the frequency range characteristic of the utility model, also is that effectively the operating frequency range or the frequency range of filtering is bigger for the utility model; Thereby can also be applicable to the electronic product or the application scenario of high-frequency high-speed, and then can make the utility model can reach the effect that promotes frequency range and product applicability.

For reaching above purpose, the utility model provides a kind of common-mode filter, comprising:

Font iron core on the one, this day the font iron core be provided with a winding section, the font iron core also includes first electrode, second electrode, third electrode and the 4th electrode this day again;

One first coil, this first coil are set around on the winding section of this day font iron core, and these first coil two ends connect with this day font first electrode and second electrode unshakable in one's determination respectively;

One second coil, this second coil are set around on the winding section of this day font iron core, and these second coil two ends connect with this day font third electrode and the 4th electrode unshakable in one's determination respectively;

Utilize this day font iron core structure that is formed in one; And this day font is arranged with first coil and second coil on its winding section unshakable in one's determination; Thereby can significantly promote the frequency range characteristic of the utility model; Also be the utility model effectively the operating frequency range or the frequency range of filtering is bigger, thereby can also be applicable to the electronic product or the application scenario of high-frequency high-speed, and then can make the utility model reach the effect that promotes frequency range and product applicability.

Description of drawings

Fig. 1 is existing combination sketch map.

Fig. 2 is existing common code impedance performance diagram.

Fig. 3 is the combination sketch map of the utility model.

Fig. 4 is the common code impedance performance diagram of the utility model.

Description of reference numerals: 10... hollow square is unshakable in one's determination; 11... the circle drum type is unshakable in one's determination; 12... hollow bulb; 13... first electrode; 14... second electrode; 15... third electrode; 16... the 4th electrode; 21... first coil; 22... second coil; 3... day font is unshakable in one's determination; 31... winding section; 33... first electrode; 34... second electrode; 35... third electrode; 36... the 4th electrode; 4... first coil; 5... second coil.

Embodiment

For making your auditor can make things convenient for other features and advantage of simple and direct understanding the utility model and the effect of being reached thereof, existing with the utility model conjunction with figs., specify as follows:

See also shown in Figure 3ly, the utility model provides a kind of common-mode filter, comprising:

Font unshakable in one's determination 3 on 1st; This day, font unshakable in one's determination 3 was provided with a winding section 31; This day font 3 seas unshakable in one's determination include first electrode 33, second electrode 34, third electrode 35 and the 4th electrode 36 again, and this first electrode, second electrode 34, third electrode 35 and the 4th electrode 36 can be holds silver layer (silver coating of end);

One first coil 4, this first coil 4 are set around on this day font winding section 31 of unshakable in one's determination 3, and these first coil, 4 two ends respectively with this day font unshakable in one's determination 3 first electrode 33 and second electrode 34 connect;

One second coil 5; This second coil 5 is set around on this day font winding section 31 of unshakable in one's determination 3; And these second coil, 5 two ends respectively with this day font unshakable in one's determination 3 third electrode 35 and the 4th electrode 36 connect, the direction of winding of this second coil 5 and first coil 4 is an equidirectional again;

See also shown in Figure 4; Utilize this day font unshakable in one's determination 3 structure that is formed in one; Also promptly this day font unshakable in one's determination 3 with this winding section 31 between do not have the gap, and be arranged with first coil 4 and second coil 5 on this day font iron core 3 the winding section 31, and can significantly promote the frequency range characteristic of the utility model; See also shown in Figure 4 for the common code impedance performance diagram of the utility model; Can find out that by this common code impedance performance diagram the utility model all can be kept higher resistance value between frequency 100MHz to 1000MHz, also be that effectively filtering 1 operating frequency range or frequency range are bigger for the utility model; So can also be applicable to the electronic product or the application scenario of high-frequency high-speed, and then can make the utility model can reach the effect that promotes frequency range and product applicability.

For making the utility model show its progressive and practicality more, following with one comparative analysis of existing do at present:

Prior art:

1, core construction is vertical for group, and the frequency range characteristic is relatively poor.

2, the product applicability is limited.

The utility model advantage:

1, core construction is formed in one, and the frequency range characteristic is preferable.

2, can promote product range of application and applicability.

More than explanation is just illustrative as far as the utility model; And nonrestrictive, those of ordinary skills understand, under the situation of spirit that does not break away from claim and limited and scope; Can make many modifications, variation or equivalence, but all will fall within the protection range of the utility model.

Claims

1. a common-mode filter is characterized in that, comprising:

Font iron core on the one, this day the font iron core be provided with a winding section, and this day the font iron core also comprise first electrode, second electrode, third electrode and the 4th electrode;

One second coil, this second coil are set around on the winding section of this day font iron core, and these second coil two ends connect with this day font third electrode and the 4th electrode unshakable in one's determination respectively.

2. common-mode filter according to claim 1 is characterized in that, this first electrode, second electrode, third electrode and the 4th electrode are the silver coating of end.

3. common-mode filter according to claim 1 is characterized in that, the direction of winding of this second coil and first coil is an equidirectional.