CN201278286Y

CN201278286Y - Common mode anti-current coil module

Info

Publication number: CN201278286Y
Application number: CNU2008201344088U
Authority: CN
Inventors: 魏冠雄
Original assignee: KELING CO Ltd
Current assignee: KELING CO Ltd
Priority date: 2008-08-18
Filing date: 2008-08-18
Publication date: 2009-07-22
Anticipated expiration: 2018-08-18

Abstract

The utility model relates to a common mode retardation coil module group. The outer part of an insulating body is provided with a metal casing, and at least two coil groups are arranged in the insulating body, wherein each coil is formed in such a way that a pair of conductors is wound on an iron core and is wound with a central tap conductor for electric connection with an outside grounding circuit. Better EMI shielding effect can be obtained through the shielding of the metal casing, radiant energy generated by each coil group can be guided for grounding after transmitting the central tap, so that the common mode retardation coil effectively restrains the radiant phenomenon generated by an electric product.

Description

Common mode choking winding module

Technical field

The relevant a kind of common mode choking winding module of the utility model aims to provide a kind of outstanding being fit to and the integration of high-frequency signals transfer function, in order to filter the common mode choking winding module of common-mode noise.

Background technology

Press, a kind of network communication usefulness that is widely used in, in order to as a kind of be assemblied between terminal device interface and Ethernet transceiving chip common mode choking winding framework, mainly divide into and directly be built on the RJ45 communication bus connector, and be built in two kinds of specifications on the printed circuit board (PCB); As shown in Figure 1, (Common Mode Choke Coil CMC) mainly is wound in a pair of transmission signal lead L1, L2 on the one iron core F similar common mode choking winding, utilizes this that lead L1, L2 are transmitted one group of common mode or slotting mould signal.

When this was one group of signal to lead L1, L2, induction reactance promptly can take place and changes in this group common mode signal common mode choking winding of flowing through, and was converted into heat energy and radiant energy and decays via returning loss, and then reached the purpose of filtering common-mode noise.

As shown in Figure 2, be a kind of being built on the circuit board 1 and commonly use common mode choking winding module 3 for what integrate with communication bus 2 (for example RJ45 communication bus) function, similarly commonly use 5 of main each pin in a row of common mode choking winding module 3, be provided with and be wound with the coil 6 that several iron cores form by wire rod and constitute in a plastic casing 4 both sides.

Yet, on take off and commonly use common mode choking winding module 3 and only be coated on coil 6 peripheries by a plastic casing 4, cause obtaining preferable EMI shielding, and can't be suppressed at the radiant energy that power conversion produced.

The utility model content

In view of this, the technical problem that the utility model solved promptly can be obtained preferable EMI shielding action providing a kind of, and can effectively suppress because the common mode choking winding module of radiant energy that power conversion produces.

Take off purpose on reaching, common mode choking winding module of the present utility model mainly is provided with a metal shell in the outside of an insulating body, and construction has two coil group at least in insulating body; Wherein, the insulating body avris is arranged with some electric pins, and each coil is wound in an iron core by couple of conductor and constitutes, and the two ends of each lead are connected with the electric pin of insulating body avris respectively; Especially, be provided with a center tap lead in the middle of each coil for electrically connecting with the external ground circuit.

The beneficial effects of the utility model are, preferable EMI shield effectiveness is obtained in the bridging effect that whole common mode choking winding module can see through metal shell, and the radiant energy that each coil produced can see through the center tap lead and be guided ground connection, and common mode choking winding module effectively suppresses the radiation phenomenon that electric equipment products produce by this.

Description of drawings

Fig. 1 is a structural representation of commonly using the common mode choking winding;

Fig. 2 is a structure cutaway view of commonly using common mode choking winding module;

Fig. 3 is the common mode choking winding module surface structure of the utility model first embodiment;

Fig. 4 is the common mode choking winding modular structure exploded view of the utility model first embodiment;

Fig. 5 is the loop construction schematic diagram of the utility model common mode choking winding module;

Fig. 6 is the common mode choking winding modular structure cutaway view of the utility model first embodiment;

Fig. 7 is the common mode choking winding modular structure cutaway view of the utility model second embodiment;

Fig. 8 is the assembling exploded view of plastic outer layer and metal shell among the utility model the 3rd embodiment.

[figure number explanation]

F iron core L1 lead

L2 lead 1 circuit board

2 communication buses, 3 common mode choking winding modules

4 plastic casings, 5 pins

6 coils, 10 insulating bodies

11 electric pin 12 base plates

13 shell portions, 20 coils

21 leads, 22 iron cores

23 center tap leads, 30 metal shells

31 grounding parts, 32 plastic outer layers

Embodiment

Characteristics of the present utility model can be consulted the detailed description of the graphic and embodiment of this case and obtained to be well understood to.

As Fig. 3 and shown in Figure 5, common mode choking winding module of the present utility model has consisted essentially of: an insulating body 10, two coil group 20, an and metal shell 30 at least; Wherein:

This insulating body 10 is provided with some electric pins 11 at its avris; This coil groups 20 is wound in an iron core 22 by couple of conductor 21 and constitutes, and the two ends of each lead 21 are connected with the electric pin 11 of insulating body 10 avris respectively, and is wound with a center tap lead 23 for electrically connecting with the external ground circuit on iron core 22; As for, this metal shell 30 is in order to be coated on the periphery of this coil groups 20 relatively.

As Fig. 4 and shown in Figure 6, this insulating body 10 has one for this base plate 12 of two coil group 20 at least of carrying, and a shell portion 13 that is covered on base plate 12 tops relatively, this at least two coil group 20 promptly be placed between the shell portion 13 and base plate 12 of insulating body 10; Moreover the shell portion 13 of 30 employings of this metal shell and insulating body 10 mode of snap engagement mutually is coated on insulating body 10 skins, to be coated on this periphery of two coil group 20 at least really.

According to this, whole common mode choking winding module can be established on the circuit board 1 for integrating with communication bus 2 functions of high-frequency signals transmission, with the common-mode noise of effective filtration high-frequency signals transmission; Especially, preferable EMI shield effectiveness is obtained in the bridging effect that whole common mode choking winding module sees through metal shell 30, and this at least the radiant energy that produced of two coil group 20 can see through the center tap line and be guided ground connection, use the radiation phenomenon that effective inhibition common-mode signal produces.

In the specific implementation, two coil group 20 central center tap lines 23 can be as shown in Figure 6 at least for this, and employing constitutes electric connection with mode and external ground circuit that the electric pin 11 of insulating body 10 avris electrically connects; Or be, as shown in Figure 7, be provided with for the grounding parts 31 that constitute to electrically connect with the external ground circuit at metal shell 30, this at least the center tap lines 23 in the middle of the two coil group 20 promptly adopts directly mode and the electric connection of external ground circuit formation that electrically connects with metal shell 30.

Even; can be as shown in Figure 8; peripheral construct one plastic outer layer 32 at metal shell 30; this plastic outer layer 32 can adopt the procedure for processing of plastics ejection formation directly to be built in the periphery of metal shell 30; or be built in the periphery of metal shell 30 with assembling modes such as snap engagement, screw locking, bondings; and can utilize the insulating effect of plastic outer layer 32, increase protection isolation effect to common mode choking winding module.

In sum, the utility model provides a preferable feasible common mode choking winding module, and the application of novel patent is offered in the whence in accordance with the law; Technology contents of the present utility model and technical characterstic the sixth of the twelve Earthly Branches disclose as above, yet the personage who is familiar with this technology still may do various replacement and the modifications that do not deviate from this case utility model spirit based on announcement of the present utility model.Therefore, protection range of the present utility model should be not limited to those disclosed embodiments, and should comprise various do not deviate from replacement of the present utility model and modifications, and is contained by following claim.

Claims

1, a kind of common mode choking winding module is characterized in that, includes:

One insulating body, its avris are provided with some electric pins;

At least the two coil group is wound in an iron core by couple of conductor and constitutes, and is wound with a center tap lead for electrically connecting with the external ground circuit on iron core;

One in order to be coated on this metal shell of two coil group periphery at least relatively.

2, common mode choking winding module as claimed in claim 1 is characterized in that, this is the electric pin electric connection of the center tap line in the middle of the two coil group and insulating body avris at least.

3, common mode choking winding module as claimed in claim 1 is characterized in that, this metal shell is provided with for constituting the grounding parts that electrically connects with the external ground circuit, this central center tap line and metal shell electric connection of two coil group at least.

4, common mode choking winding module as claimed in claim 1 is characterized in that, this insulating body has one for this base plate of two coil group at least of carrying, and a shell portion that is covered on the base plate top relatively; This at least the two coil group be placed between the shell portion and base plate of insulating body.

5, common mode choking winding module as claimed in claim 4 is characterized in that, this metal shell then adopt with the shell portion of insulating body mutually the mode of snap engagement be coated on the insulating body skin.

6, common mode choking winding module as claimed in claim 1 is characterized in that the peripheral construct of this metal shell has a plastic outer layer.

7, common mode choking winding module as claimed in claim 6 is characterized in that, this plastic outer layer adopts the mode of plastics ejection formation to be built in the periphery of this metal shell.

8, common mode choking winding module as claimed in claim 6 is characterized in that, this plastic outer layer is built in the periphery of this metal shell in the buckle mode.

9, common mode choking winding module as claimed in claim 6 is characterized in that, this plastic outer layer screw locking mode is built in the periphery of this metal shell.

10, common mode choking winding module as claimed in claim 6 is characterized in that, this plastic outer layer is built in the periphery of this metal shell in the bonding mode.