TWM557935U - Common-mode filter - Google Patents

Abstract

A common mode filter comprising: a core cylinder having a first flange portion and a second flange portion extending on opposite sides of the core cylinder, the first flange portion and the second flange portion a first end electrode and a second end electrode are respectively disposed on the first flange portion, and a third end electrode and a fourth end electrode are respectively extended on the second flange portion; a first coil is fixed on the core body to form a first layer of the winding, the first coil is fixed to the first end electrode, and the other end of the first coil is fixed on the first coil a second end of the second coil is fixed on the first coil to form a second layer of the winding, the second end of the second coil is fixed to the second end electrode, and the other end of the second coil is It is fixed to the fourth terminal electrode.俾 This creation can achieve the common mode filter which reduces the DC resistance (Rdc) and boosts the inductance value, so that the ability to suppress (high frequency) common mode interference and the improvement of the characteristics of the common mode filter can be achieved.

Description

Common mode filter

This creation is a common mode filter, especially a common mode filter that reduces the DC resistance (Rdc) and boosts the inductance value.

A common common mode filter is an electronic filter that is mounted between an electronic device and its power source with a capacitive element. The purpose is to reduce electromagnetic interference conducted on the power line between the device and the power source, thereby suppressing low frequency. Electromagnetic interference signal. In addition, the common mode filter can also be used for high speed signal filtering of the wafer to suppress high frequency electromagnetic interference signals. Therefore, a common mode filter, as shown in the first figure, includes a core cylinder 20, a first coil 21, and a second coil 22, and the first pillar electrode 20 is sequentially provided with a first terminal electrode. 201. A second terminal electrode 202 is disposed on the other side of the core body 20 with a third terminal electrode 203 and a fourth terminal electrode 204. The first coil 21 and the second coil 22 are adjacently fixed to the core cylinder 20 in parallel (horizontal), and the first coil 21 is fixed at the first end electrode 201, the first coil The other end of the second coil 22 is fixed to the second end electrode 202, and the other end of the second coil 22 is fixed to the fourth end electrode 204, thereby forming Normal common mode filter.

The foregoing common mode filter has a small number of windings (the first and second coils are arranged horizontally (parallel) in a single layer manner, so that the winding area of the core cylinder 20 is limited, which will affect the first and second The number of turns of the coil is reduced, so that the common mode filter has its power The problem of small inductance is, and at the same time, if the wire diameter used by the first and second coils is small, the DC resistance (Rdc) is large and the power loss is large. Therefore, although high frequency filtering and electromagnetic interference reduction can be achieved, in order to achieve the high, versatility and stability of modern electronic products, the common mode filter will not meet the high function and high stability of future electronic products. . Therefore, how to design a high-function and high-stability common-mode filter for the lack of the above discussion is the technical difficulty to be solved by the applicant.

In view of the lack of practice, this creation aims to solve and improve the problems and defects in the practice.

In order to achieve the above object, the present invention provides a common mode filter, comprising: a core cylinder, a first flange portion and a second flange portion respectively extending on two sides of the core cylinder, the first The flange portion and the second flange portion are symmetrically disposed, and a first end electrode and a second end electrode are respectively extended on the first flange portion, and a third end is respectively extended on the second flange portion An electrode and a fourth end electrode; a first coil is wound around the core body to form a first layer of the winding, the first coil end is fixed to the first end electrode, and the first The other end of the coil is fixed to the third end electrode; a second coil is wound around the first coil to form a second layer of the winding, and the second end of the second coil is fixed to the second end electrode And the other end of the second coil is fixed to the fourth end electrode; a cover or a back film is coupled to the same side of the core cylinder, the first flange portion and the second flange portion.

The first end electrode, the second end electrode, the third end electrode and the fourth end electrode are three-dimensional trapezoids having a height.

Therefore, 俾 can make this creation reach the common mode filter and reduce the DC resistance (Rdc) And to improve the inductance value, so that the ability to suppress (high-frequency) common-mode interference, and the improvement of the characteristics of the common-mode filter can be achieved.

[Use]

20‧‧‧core cylinder

201‧‧‧ first end electrode

202‧‧‧second end electrode

203‧‧‧Terminal electrode

204‧‧‧ fourth end electrode

21‧‧‧First coil

22‧‧‧second coil

[this creation]

3‧‧‧core cylinder

31‧‧‧First flange

32‧‧‧Second flange

33‧‧‧first end electrode

34‧‧‧second end electrode

35‧‧‧Terminal electrode

36‧‧‧ fourth end electrode

4‧‧‧First coil

41‧‧‧The first layer of winding

42‧‧‧ line end

43‧‧‧ line end

5‧‧‧second coil

51‧‧‧Rolling the second floor

52‧‧‧ line end

53‧‧‧ line end

6‧‧‧ Cover or back film

The first figure is a side view of a conventional common mode filter.

The second figure is a schematic exploded perspective view of the common mode filter of the preferred embodiment of the present invention.

The third figure is a schematic diagram of the three-dimensional structure combination of the second figure of the preferred embodiment of the present invention.

The fourth figure is a schematic cross-sectional view of the first coil and the second coil winding of the common mode filter of the preferred embodiment of the present invention.

The fifth figure is a schematic diagram of the planar structure of the first coil and the second coil winding of the common mode filter of the preferred embodiment of the present invention.

The sixth figure is a cross-sectional structural diagram of the common mode filter of the preferred embodiment of the present invention in which the first coil and the second coil are changed to a winding having a relatively large wire diameter.

In order for your review board to have a clear understanding of the content of this work, please refer to the following examples with diagrams and symbols, please refer to it.

Referring to the second to fifth figures, the present invention provides a common mode filter comprising: a core cylinder 3, a first coil 4, a second coil 5 and a cover 6.

In this embodiment, a first flange portion 31 and a second flange portion 32 are respectively extended on two sides of the core cylinder 3, and the first flange portion 31 and the second flange portion 32 are symmetrically disposed. It is preferably a three-dimensional rectangle. A first end electrode 33 and a second end electrode 34 are respectively disposed on the first flange portion 31, and a third end electrode 35 and a fourth end electrode are respectively extended on the second flange portion 32. 36. Further preferably, the first end electrode 33, the second end electrode 34, the third end electrode 35 and the fourth end electrode 36 are three-dimensional trapezoids with a height to facilitate a surface-mount technology (SMT) process. Adhesive soldering.

The first coil 4 is fixed to the core body 3 to form a first layer 41 of the winding. The first coil 4 is fixed (welded) to the first end electrode 33. The other wire end 43 of the first coil 4 is fixed (welded) to the third terminal electrode 35. Further, the second coil 5 is fixed to the first coil 4 to form a second layer 51 of the winding, and the second end 5 of the second coil 5 is fixed (welded) to the second end electrode 34, and The other end 53 of the second coil 5 is fixed (welded) to the fourth end electrode 36. Further, the cover plate 6 is coupled (adhered) to the same side of the core cylinder 3, the first flange portion 31 and the second flange portion 32. The cover 6 is arranged to increase the inductance of the induced common mode filter. Further preferably, the cover plate 6 is made of a magnetic material, and the cover plate 6 can be replaced by a back film, which can be ordered by a dispenser with UV glue (ie, UV curing resin). The glue (coating) is constructed and is not limited thereto. Therefore, the cover or the backing film 6 is provided to facilitate the adhesion (suction) effect in the surface-mount devices (SMD) process, and further increase the production capacity and increase the yield.

Therefore, the present application further explains, please refer to the fourth and fifth figures, wherein the first coil 4 and the second coil 5 of the present invention form a winding of the inner and outer layers, as in the core cylinder. 3 Under the same winding area (compared with conventional use), the winding ratio of the first coil 4 and the second coil 5 will increase. Therefore, the inductance value of the proposed common mode filter will increase and the impedance will increase, so that the ability to suppress (high frequency) common mode interference can be improved, which is a feature of the creation. The first coil 4 and the second coil 5 can achieve this effect on the core body 3 regardless of the priority of the winding.

Furthermore, please continue to refer to the sixth figure, wherein the first coil 4 and the second coil 5 can be changed to windings having a relatively large wire diameter, and the winding first layer 41 and the winding second layer 51 are also respectively formed. . In this embodiment, the first coil 4 and the second coil 5 respectively form a winding of the inner and outer layers, and the line can be raised when the first coil 4 and the second coil 5 have the same turns ratio. The diameter increases the cross-sectional area of the windings of the first coil 4 and the second coil 5, so that the DC resistance (Rdc) can be reduced and the DC power loss is low, so that the differential mode signal with low DC and low frequency can pass. In order to improve the characteristics of the common mode filter, it is the characteristics of the creation.

The above discussion is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention; therefore, the equivalent shape, structure or combination of changes made in the spirit and scope of the present invention should be It is covered by the patent application scope of this creation.

Claims (3)

A common mode filter comprising: a core cylinder having a first flange portion and a second flange portion extending on opposite sides of the core cylinder, the first flange portion and the second flange portion a first end electrode and a second end electrode are respectively disposed on the first flange portion, and a third end electrode and a fourth end electrode are respectively extended on the second flange portion; a first coil is fixed on the core body to form a first layer of the winding, the first coil is fixed to the first end electrode, and the other end of the first coil is fixed on the first coil a second end of the second coil is fixed on the first coil to form a second layer of the winding, the second end of the second coil is fixed to the second end electrode, and the other end of the second coil is It is fixed to the fourth terminal electrode. The common mode filter according to claim 1, wherein the first end electrode, the second end electrode, the third end electrode and the fourth end electrode are three-dimensional trapezoids having a height. The common mode filter according to claim 1, wherein a cover plate or a back film is coupled to the same side of the core cylinder, the first flange portion and the second flange portion.