KR20140081640A - Electro-magnetic interference filter and method of manufacturing the same - Google Patents

Abstract

The present invention relates to an electromagnetic interference filter device and a manufacturing method thereof. The electromagnetic interference filter device of the present invention comprises a base core including a first base core and a second base core facing the first base core; a leg core including first and second leg cores formed between the first base core and the second base core, wherein the first and second leg cores face each other; a winding coil including first and second winding coils connected to a power source by being wound around the first and second leg cores, respectively, wherein the first and second winding coils provide magnetizing inductance and leakage inductance, respectively; and a central core providing a leakage path between the first and second base cores by being formed between the first and second cores.

Description

TECHNICAL FIELD [0001] The present invention relates to an electromagnetic interference filter device,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an Electro-Magnetic Interference (EMI) device applicable to a flat panel display (FPD) and a method of manufacturing the same.

Generally, in the case of a flat panel display device (FPD), electromagnetic noise caused by an image board, a semiconductor device, and the like as well as a power converter by a switching method can be largely generated. Electromagnetic interference (EMI) filters may be used to suppress such electromagnetic noise.

Such an electromagnetic interference filter may be used in a Switch Mode Power Supply (hereinafter referred to as SMPS). The SMPS performs a switching operation at a low frequency, and electromagnetic wave noise may be generated by such a switching operation.

Typically, the SMPS of the flat panel display device may consist of a power quality unit, a power conversion unit, and a load. The power converter may include a rectifier, a power factor correction (PFC) unit, and a switching DC / DC converter. When the non-isolated power factor correction (PFC) unit is used, the power converter may employ a DC / DC converter of a topology that can be mostly isolated from an LLC (inductor + inductor + capacitor) resonant type converter or a flyback converter have.

At this time, in the DC / DC converter, electromagnetic interference (EMI) can be largely generated due to abrupt current and voltage change due to the switching operation, downsizing and speeding up of the image board and the semiconductor device. Electromagnetic interference (EMI) filters can be inserted in front of the power factor correction section as a way to regulate this.

On the other hand, the electromagnetic noise is divided into Conducted Emission and Radiated Emission, which are again divided into differential mode current and common mode current.

Generally, in the common mode, the common mode noise is high over a wide band, and in the differential mode, the differential mode noise is large in the low frequency band. Particularly, in the case of the display device to which the power factor correction (PFC) is applied, the differential mode noise in the low frequency band is further increased.

The electromagnetic wave filter applied to the flat panel display employing the conventional power factor correction circuit includes two common mode chokes (for example, CM choke 1 and CM choke 2) for reducing common mode noise formed at a high / high frequency, And a differential mode choke (e.g., DM choke) for differential mode noise reduction.

Particularly, in the case of a flat panel display device, a line filter (e.g., CM choke 1, DM choke 2, and DM choke) according to a slim design of a set has a low height, A line filter structure in which primary and secondary windings are wound together on a toroidal type core may be applied.

As a capacitor for noise reduction, an X-type capacitor may be used to reduce differential mode noise, and a Y-type capacitor may be used to reduce common mode noise.

However, even when the conventional electromagnetic interference (EMI) filter is used, many other filtering elements must be used, which leads to problems of size and cost increase.

Patent Document 1 described in the following prior art document relates to a direct electromagnetic interference filter and does not disclose a technical matter that can increase the leakage inductance.

Korean Patent Publication No. 2012-0067568

Disclosure of Invention Technical Problem [8] The present invention provides an electromagnetic interference (EMI) device and a method of manufacturing the same that can increase the leakage inductance.

According to a first technical aspect of the present invention, the present invention provides a semiconductor device comprising: a base core including a first base core and a second base core opposed to the first base core; The first and second leg cores including first and second leg cores formed between the first and second base cores, the first and second leg cores being opposed to each other; A first and a second winding coils wound on the first and second leg cores, respectively, and connected to a power source, wherein each of the first and second winding coils provides a magnetizing inductance and a leakage inductance; And a central core formed between the first and second leg cores to provide a leakage path between the first and second base cores; And an electromagnetic interference filter device.

According to a second technical aspect of the present invention, there is provided a semiconductor device comprising: a base core including a first base core and a second base core opposed to the first base core; The first and second leg cores including first and second leg cores formed between the first and second base cores, the first and second leg cores being opposed to each other; A bobbin portion surrounding each of the first and second leg cores and including first and second bobbins having winding regions; And a first and a second winding coils wound around a winding region of each of the first and second bobbins and connected to a power source, wherein each of the first and second winding coils includes a winding coil portion ; And a central core formed between the first and second leg cores to provide a leakage path between the first and second base cores; And an electromagnetic interference filter device.

In the first and second technical aspects of the present invention, the central core may be attached to the first and second base cores.

Further, as a third technical aspect of the present invention, the present invention provides a semiconductor device comprising: a base core; The first and second winding coils being wound on both sides of the base core and connected to a power source, wherein each of the first and second winding coils provides a magnetizing inductance and a leakage inductance; And a center core formed between the first and second winding coils and providing a leakage path between the base cores; And an electromagnetic interference filter device.

In a third technical aspect of the present invention, the central core may be attached to the base core.

The central core may be made of a material different from that of the base core.

For example, the material of the base core may be a manganese-zinc ferrite alloy, and the material of the center core may be a nickel-zinc ferrite alloy.

According to a fourth technical aspect of the present invention, there is provided a semiconductor device comprising a base core including a first base core, a second base core opposed to the first base core, Providing leg cores between the base cores, the leg cores including first and second leg cores formed to face each other; Forming a bobbin portion including first and second bobbins having a winding region so as to surround each of the first and second leg cores; Winding the first and second winding coils on the winding regions of the first and second bobbins to form a winding coil portion; And forming a central core between the first and second leg cores to provide a leakage path between the first and second base cores; And an electromagnetic interference filter device.

In the first, second and fourth technical aspects of the present invention, the central core may be made of a material different from that of the base core and the leg core.

For example, the material of the base core and the leg core may be a manganese-zinc ferrite alloy, and the material of the center core may be a nickel-zinc ferrite alloy.

The method of manufacturing the electromagnetic interference filter device further includes connecting the coil end of the winding coil part to the pin of the base structure between the step of forming the winding coil part and the step of forming the center core .

And, in a fourth technical aspect of the present invention, the step of forming the central core may be performed to attach the central core to the first and second base cores.

In the electromagnetic interference filter according to the present invention, the magnetizing inductance and the leakage inductance can be provided at the same time, and in particular, the leakage inductance can be increased.

1 is a structural view of an electromagnetic interference filter device according to a first embodiment of the present invention;
2 is a structural view of an electromagnetic interference filter device according to a second embodiment of the present invention;
3 is a structural view of an electromagnetic interference filter device according to a third embodiment of the present invention;
4 is an exploded perspective view of an electromagnetic interference filter device according to a second embodiment of the present invention;
5 is an assembled perspective view of an electromagnetic interference filter device according to a second embodiment of the present invention.
6 is an equivalent circuit diagram of an electromagnetic interference filter device according to an embodiment of the present invention.
7 is a differential mode current conduction path diagram of an electromagnetic interference filter device according to an embodiment of the present invention.
8 is a graph showing a differential mode noise reduction effect of an electromagnetic interference filter device according to an embodiment of the present invention.
9 is a flow chart showing a manufacturing method of an electromagnetic interference filter device according to an embodiment of the present invention.
10 is an explanatory view of a process of forming a base core and a leg core according to an embodiment of the present invention.
11 is an explanatory diagram of a bobbin part forming process according to an embodiment of the present invention.
FIG. 12 is an explanatory view of a winding coil part forming process according to an embodiment of the present invention; FIG.
13 is an explanatory view of a central core forming process according to an embodiment of the present invention.
FIG. 14 is a flow chart showing a process of connecting a coil end portion of a winding coil portion according to an embodiment of the present invention. FIG.
15 is a front view and a rear view of an electromagnetic interference filter device for explaining a process of connecting coil ends of a coiled coil part according to an embodiment of the present invention.
16 is a circuit example in which an electromagnetic interference filter according to an embodiment of the present invention is applied to an electronic device.

Hereinafter, specific embodiments in which the present invention can be practiced will be described with reference to the drawings. It is to be understood that the invention is not limited to the disclosed exemplary embodiments, and that various changes and modifications may be made therein without departing from the spirit and scope of the invention.

In addition, in the embodiments of the present invention, the terms and expressions related to the structures, shapes and numerical values described as examples are merely examples for helping understanding of the technical matters of the present invention, It should be understood that various changes may be made therein without departing from the spirit of the invention.

In the drawings referred to in the present invention, components having substantially the same configuration and function as those of the present invention will be denoted by the same reference numerals. Accordingly, where the same reference numerals are used throughout the drawings, redundant description may be omitted.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention.

1 is a structural view of an electromagnetic interference filter device according to a first embodiment of the present invention.

1, an electromagnetic interference filter device according to a first embodiment of the present invention may include a base core 100, a leg core 200, a winding coil part 400, and a center core 500 .

The base core 100 may include a first base core 110 and a second base core 120 facing the first base core 110.

The leg core 200 may include first and second leg cores 210 and 220 formed between the first and second base cores 110 and 120. The first and second leg cores 210 and 220 may be formed opposite to each other.

Here, the reason why the base core 100 and the leg core 200 are given different terms is due to whether or not the coil is wound, and is not caused by the manufacturing method, material, or electrical characteristics, It is not. For example, the base core 100 and the leg core 200 may be separately formed and then bonded to each other. Alternatively, the base core 100 and the leg core 200 may be integrally formed. have.

The winding coil part 400 may include first and second winding coils 410 and 420 wound on the first and second leg cores 210 and 220 and connected to a power source. At this time, each of the first and second winding coils 410 and 420 may provide a magnetizing inductance and a leakage inductance.

Here, the first and second winding coils 410 and 420 may have the same winding ratio as the conventional electromagnetic interference filter.

The first winding coil 410 has first and second coil ends E11 and E12 for being connected to a power source in a state where the first leg core 210 is wound on the first leg core 210. [ The second winding coil 420 has first and second coil ends E21 and E22 for being connected to a power source while being wound on the second leg core 220. [

The center core 500 may be formed between the first and second leg cores 210 and 220 to provide a leakage path between the first and second base cores 110 and 120.

At this time, the center core 500 may be attached to the first and second base cores 110 and 120. The attachment method is not limited as long as it can provide a leakage path between the first and second base cores 110 and 120. For example, it may be bonding or soldering, but is not limited thereto. The center core 500 may provide a leakage path between two attached points of the base core 150.

The center core 500 may be spaced apart from the first leg core 210 and spaced apart from the second leg core 210 or 220.

The center core 500 may be made of a material different from that of the base core 100 and the leg core 200 in order to further increase the leakage inductance. For example, the base core 100 and the leg core 200 may be made of a manganese-zinc ferrite alloy, and the center core 500 may be made of nickel-zinc (Ni-Zn) ) Ferrite alloy.

2 is a structural view of an electromagnetic interference filter device according to a second embodiment of the present invention.

Referring to FIG. 2, it may include a base core 100, a leg core 200, a bobbin portion 300, a winding core portion 400, and a center core 500.

As described above, the electromagnetic interference filter device according to the second embodiment of the present invention shown in Fig. 2 is different from the electromagnetic interference filter device according to the first embodiment of the present invention in that the electromagnetic interference filter device shown in Fig. 1 It is preferable that the electromagnetic interference filter device according to the first embodiment of the present invention further includes a bobbin portion 300 for securing workability and insulation at the time of manufacture, .

Accordingly, the base core 100, the leg core 200, and the center core 500 are the same as those of the electromagnetic interference filter device according to the first embodiment of the present invention shown in FIG. 1, .

The bobbin 300 may include a first bobbin 310 and a second bobbin 320 surrounding the first and second leg cores 210 and 220 and having a winding region. Here, the bobbin portion 300 facilitates the winding operation of the winding coil portion 400 as described below, and ensures the insulation between the winding coil portion 400 and the core.

The first bobbin 310 may be rotatable about the first leg core 210 and may be formed to surround the outer circumferential surface of the first leg core 210. The second bobbin 32 may be rotatable about the second leg core 220 and may be formed to surround the outer circumferential surface of the second leg core 220.

The first bobbin 310 may include a winding region 311, a gear 312 and a groove 313 and the second bobbin 320 may include a winding region 321, a gear 322, 323).

The winding regions 311 and 321 of each of the first and second bobbins 310 and 320 are wound around the winding coil portion 400 and the gears 312 and 322 of the first and second bobbins 310 and 320, The grooves 313 and 323 can be formed on the opposite sides of each of the winding regions 311 and 321, respectively, for ease of coil winding work.

The winding coil part 400 may include first and second winding coils 410 and 420 wound around the winding areas 311 and 321 of the first and second bobbins 310 and 320 and connected to a power source. Each of the first and second winding coils 410 and 420 may provide a magnetizing inductance and a leakage inductance.

Here, the first and second winding coils 410 and 420 may have the same winding ratio as the conventional electromagnetic interference filter.

The first winding coil 410 may have first and second coil ends E11 and E12 to be connected to a power source while being wound on the first bobbin 310. [ The second winding coil 420 may have first and second coil ends E21 and E22 to be connected to a power source while being wound on the second bobbin 320. [

3 is a structural view of an electromagnetic interference filter device according to a third embodiment of the present invention.

Referring to FIG. 3, the electromagnetic interference filter device according to the third embodiment of the present invention may include a base core 150, a winding coil part 400, and a center core 500.

The base core 150 may be integrally formed in a toroidal shape.

The winding coil section 400 may include first and second winding coils 410 and 420 wound on both sides of the base core 150 and connected to a power source. At this time, each of the first and second winding coils 410 and 420 may provide a magnetizing inductance and a leakage inductance.

Here, the first and second winding coils 410 and 420 may have the same winding ratio as the conventional electromagnetic interference filter.

The first winding coil 410 may have first and second coil ends E11 and E12 to be connected to a power source while being wound on the core 150. [ The second winding coils 420 may have first and second coil ends E21 and E22 for being connected to a power source while being wound on the core 150. [

The center core 500 may be formed between the base cores 150 to provide a leakage path between the base cores 150.

At this time, the center core 500 may be attached to the base core 150. The attachment method is not limited as long as it can provide a leakage path between the base cores 150. For example, it may be bonding or soldering, but is not limited thereto. The center core 500 may provide a leakage path between two attached points of the base core 150.

The center core 500 may be spaced apart from the first winding coil 410 by a distance equal to the distance between the center core 500 and the second winding coil 420.

The center core 500 may be made of a material different from that of the base core 150 to further increase the leakage inductance. For example, the base core 150 may be made of a manganese-zinc ferrite alloy, and the center core 500 may be made of a nickel-zinc (Ni-Zn) ferrite alloy. have.

1, 2 and 3, the shape of the base core may be a rectangular shape as shown in FIGS. 1 and 2. As shown in FIG. 3, Toroidal shape, and is not particularly limited to the shape or form thereof.

1 and 2, the base core 100 and the leg core 200 may be integrally formed, separately assembled and assembled and attached to each other, It is not limited.

FIG. 4 is an exploded perspective view of an electromagnetic interference filter device according to a second embodiment of the present invention, and FIG. 5 is an assembled perspective view of an electromagnetic interference filter device according to a second embodiment of the present invention.

The electromagnetic interference filter device according to the second embodiment of the present invention will be described with reference to FIGS. 4 and 5. FIG.

For example, referring to FIG. 4, the first bobbin 310 is manufactured as two piece bobbins 310-1 and 310-2, and is assembled to the first leg core 210 as shown in FIG. . 4, the second bobbin 320 may be made of two pieces of bobbins 320-1 and 320-2, and may be assembled to the second leg core 220 as shown in FIG. have.

Then, the first winding coil 410 and the second winding coil 420 may be wound on the first bobbin 310 and the second bobbin 320, respectively.

The center core 500 may then be positioned between the first winding coil 410 and the second winding coil 420 and attached to the base core 100.

At this time, the base core 100 and the leg core 200 may be assembled in a separate base structure 600. The base structure 600 may be formed with pins for electrical connection between the winding coil portion and the substrate.

5, each of the coil ends E21 and E22 of the second winding coils 420 may be electrically connected to the pins of the base structure 600. As shown in FIG. Although not directly shown, each of the coil ends of the first winding coil 410 may also be electrically connected to the pins of the base structure 600 in the same manner as the second winding coil 420.

6 is an equivalent circuit diagram of an electromagnetic interference filter device according to an embodiment of the present invention.

5 and 6, in the electromagnetic interference filter device according to the embodiment of the present invention, the first winding coil 410 is connected to the first common mode choke between the first and second coil terminals E11 and E12 (Lcm1). The second winding coil 420 may be represented by a second common mode choke Lcm2 between the third and fourth coil terminals E21 and E22.

In addition, first and second magnetizing inductances Lm1 and Lm2 appear in parallel in the first and second common mode chokes Lcm1 and Lcm2, respectively.

The leakage magnetic fluxes formed between the first and second winding coils 410 and 420 may be expressed by first and second leakage inductances Lk1 and Lk2. The first and second leakage inductances Lk1 and Lk2 may be increased by the leakage path provided by the central core 500. [

Meanwhile, the first and second leakage inductances Lk1 and Lk2 may be increased by the center core 500. For example, when the conventional electromagnetic interference filter and the electromagnetic interference filter device according to the embodiment of the present invention are tested at 1 kHz and 100 kHz in the low frequency of the differential mode, the leakage inductances are as shown in Table 1 below.

Number of experiments Existing technology Invention [1 kHz] [100kHz] [1 kHz] [100kHz] One 144 μH 141 μH 256 μH 253 μH 2 145 μH 141 μH 261 μH 257 μH 3 144 μH 140 μH 216 μH 213 μH 4 144 μH 141 μH 218 μH 214 μH

7 is a differential mode current conduction path diagram of an electromagnetic interference filter device according to an embodiment of the present invention.

Referring to Fig. 7, an equivalent circuit (refer to the upper side of Fig. 7) in the differential mode of the electromagnetic interference filter device according to the embodiment of the present invention is the same as the equivalent circuit shown in Fig.

At this time, from the viewpoint of the low-frequency noise in the differential mode, it can be shown as an equivalent circuit having the first and second leakage inductances Lk1 and Lk2 as shown in the lower side of FIG.

Referring to Table 1 and FIG. 7, the first and second leakage inductances Lk1 and Lk2 can be increased by about two times as compared with the prior art, and the first and second leakage inductances Lk1 and Lk2 , Lk2) perform the filter function for the differential mode noise, so that it is understood that the effect of removing the low frequency in the differential mode can be improved. In other words, this can reduce the number of elements for eliminating the low-frequency of the differential mode.

8 is a graph showing the differential mode noise reduction effect of the electromagnetic interference filter device according to the embodiment of the present invention.

The graph of FIG. 8A is a graph showing a low-frequency reduction effect in a differential mode for 110 V ac of 60 Hz. Referring to this graph, it can be seen that the characteristics are improved in the low frequency characteristic (P12 portion) by the electromagnetic interference filter device according to the embodiment of the present invention, compared with the low frequency characteristic (P11 portion) by the existing electromagnetic interference filter.

8B is a graph showing a low frequency reduction effect in a differential mode for 230 V ac at 60 Hz. Referring to this graph, it can be seen that the characteristics are improved in the low frequency characteristic (P22 portion) by the electromagnetic interference filter device according to the embodiment of the present invention, compared with the low frequency characteristic (P21 portion) by the conventional electromagnetic interference filter.

9 is a flowchart illustrating a method of manufacturing an electromagnetic interference filter device according to an embodiment of the present invention. 10 is an explanatory view of a process of preparing a base core and a leg core according to an embodiment of the present invention.

Referring to FIGS. 1 to 9 and 10, in step S100, the base core 100 and the leg core 200 may be provided.

The base core 100 may include a first base core 110 and a second base core 120 facing the first base core 110 as described above.

The leg core 200 may include first and second leg cores 210 and 220 formed to face each other between the first and second base cores 110 and 120.

At this time, the shape of the core may be a rectangular shape, a toroidal shape, and is not particularly limited to a shape or a shape thereof. In addition, the base core 100 and the leg core 200 may be integrally formed, separately manufactured, assembled and attached, and the manufacturing method is not particularly limited.

11 is an explanatory view of a bobbin part forming process according to an embodiment of the present invention.

Referring to FIGS. 1 to 11, in step S300, the bobbin 300 may be formed.

The bobbin portion 300 may include first and second bobbins 310 and 320 having a winding region and may be formed to surround the first and second leg cores 210 and 220, respectively. For example, as shown in FIGS. 4 and 5, the first bobbin 310 may be formed of two pieces of bobbins 310-1 and 310-2. As shown in FIG. 5, (Not shown). 4, the second bobbin 320 may be made of two pieces of bobbins 320-1 and 320-2, and may be assembled to the second leg core 220 as shown in FIG. have.

In addition, the first bobbin 310 may include a winding region 311, a gear 312, and a groove 313. Here, the gear 312 and the groove 313 may be formed at the opposite sides of the gear 312 and the groove 313, respectively, for the purpose of ease of winding work. The second bobbin 320 may include a winding region 321, a gear 322, and a groove 323. Here, the gear 312 and the groove 313 may be formed at the opposite sides of the gear 312 and the groove 313, respectively, for the purpose of ease of winding work.

In the step S300 of forming the bobbin portion 300, the first and second winding coils 410 and 420 may be formed to have the same winding ratio.

12 is an explanatory view of a winding coil part forming process according to an embodiment of the present invention.

1 to 12, in step S500, the winding coil section 400 may be formed.

The winding coil part 400 may include first and second winding coils 410 and 420 wound on the winding areas of the first and second bobbins 310 and 320, respectively.

The first winding coil 410 may have first and second coil ends E11 and E12 to be connected to a power source in a state where the first winding core 410 is wound on the first leg core 210. [ The second winding coil 420 may have first and second coil ends E21 and E22 to be connected to a power source while being wound on the second leg core 220. [

1 to 12, a winding coil section forming process according to an embodiment of the present invention will be described. In a step S500 of forming the winding coil section 400, the first bobbin 310 And a gear 312 and a groove 313 formed at both side edges of the winding region of the first bobbin 310 and the second bobbin 320 may include a winding region 312 of the second bobbin 320, And a gear 322 and a groove 323 formed on both side edges of the gear 322, respectively.

In the step S500 of forming the winding coil section 400, the grooves 313 and 323 formed at the edges of the first and second bobbins 310 and 320 and the gears 312 and 322 are used to form the winding coil section 400, The first and second winding coils 410 and 420 can be respectively wound on the winding regions 311 and 321 of the first and second bobbins 310 and 320, respectively.

As described above, the first bobbin 310 may include a winding region 311, a gear 312, and a groove 313. Here, the gear 312 and the groove 313 may be formed at the opposite edges of the gear 312 and the groove 313, respectively. The second bobbin 320 may include a winding region 321, a gear 322, and a groove 323. Here, the gear 322 and the groove 323 may be formed at the opposite sides of the gear 322, respectively.

For example, one end side coil of the first coil end E11 or the second coil end E12 of the first winding coil 410 may be connected to a groove 313 formed at the edge of the first bobbin 310 A first winding coil 410 is wound on the winding area 311 of the first bobbin 310 by rotating the gear 312 formed at the edge of the first bobbin 310 by engaging the external power transmission, Can be rewound.

In the same manner as above, one end side coil of the third coil end E21 or the fourth coil end E22 of the second winding coil 420 is connected to the groove formed at the edge of the second bobbin 320 323 of the second bobbin 320 to engage and rotate the gear 322 formed at the end of the second bobbin 320 to the winding region 321 of the second bobbin 320 to rotate the second winding coil 420 Can be rewound.

13 is an explanatory view of a central core forming process according to an embodiment of the present invention.

Referring to FIGS. 1 to 13, the central core 500 may be formed in step S700.

For example, the central core 500 may be formed between the first and second leg cores 210 and 220. The center core 500 may be attached to the first and second base cores 110 and 120. For example, the center core 500 may be attached to the first and second base cores 110 and 120 by solder 500a or 500b, but is not limited thereto.

At this time, the center core 500 may be formed so that the distance between the center core 500 and the first leg core 210 is the same as the distance between the center core 500 and the second leg core 220.

Here, the center core 500 may be made of a material different from that of the base core 100 and the leg core 200 in order to increase the leakage inductance of the electromagnetic interference filter device. For example, the material of the base core 100 and the leg core 200 may be a manganese-zinc (Mn-Zn) ferrite alloy. The material of the center core 500 may be a nickel-zinc (Ni-Zn) ferrite alloy.

FIG. 14 is a flow chart showing a process of connecting the coil ends of the winding coil section according to the embodiment of the present invention. 15 is a front view and a rear view of an electromagnetic interference filter device for explaining a process of connecting a coil end portion of a winding coil portion according to an embodiment of the present invention.

Referring to FIG. 14, a method of manufacturing an electromagnetic interference filter device according to an embodiment of the present invention includes forming a winding core part 400 (S500) and forming a center core 500 (step S700) (S600) connecting the coil end of the winding coil portion to the pin of the base structure 600, as shown in FIG.

In step S600, the coil ends E11, E12, E21, and E22 of the first and second winding coils 410 and 420 may be electrically connected to the fins of the base structure 600. [

14 and 15, a step S600 of connecting the coil ends E11, E12, E21 and E22 is performed by connecting the coil ends E11, E12, and E12 of the first and second coil coils 410 and 420, E21, and E22 may be electrically connected to the pins formed on the base structure 600 through soldering or the like.

Here, the fins of the base structure 600 may be connected to a power supply of the substrate on which the electromagnetic interference filter device according to the embodiment of the present invention is mounted.

16 is an exemplary circuit diagram in which an electromagnetic interference filter according to an embodiment of the present invention is applied to an electronic device.

16, an electromagnetic interference filter according to an embodiment of the present invention is installed between an input terminal (Live and Neutral) and an electronic device and is connected to Y capacitors YC1 and YC2 and an X capacitor XC1, XC2).

For example, an electromagnetic interference filter according to an embodiment of the present invention may be applied to a flat panel display device, in which electromagnetic interference filter devices in which the functions of the common mode choke and the differential mode choke are integrated, It is possible to reduce the number of elements and size for reducing the mode noise. As a result, the design time can be shortened and the development cost can be reduced.

In addition, the conventional common mode and differential mode choke have a disadvantage in that productivity is lowered due to manual manufacture. However, since the automatic winding can be made at the time of manufacture, it is possible to increase the production amount, It is possible to expect an increase in the space utilization due to the miniaturization.

100: Base core
110: first base core
120: second base core
200: leg core
210, 220: first and second leg cores
300:
310, 320: first and second bobbins
400: winding coil part
410, 420: first and second winding coils
500: central core
E11, E12, E21, E22: coil ends

Claims (31)

A base core including a first base core and a second base core opposed to the first base core;
The first and second leg cores including first and second leg cores formed between the first and second base cores, the first and second leg cores being opposed to each other;
A first and a second winding coils wound on the first and second leg cores, respectively, and connected to a power source, wherein each of the first and second winding coils provides a magnetizing inductance and a leakage inductance; And
A center core formed between the first and second leg cores to provide a leakage path between the first and second base cores; And an electromagnetic interference filter device.
The apparatus of claim 1,
Wherein the base core and the leg core are made of a material different from the material of the base core and the leg core.
The apparatus of claim 1,
And an electromagnetic interference filter attached to the first and second base cores.
The apparatus of claim 1,
Wherein the distance between the first leg core and the second leg core is equal to the distance between the first leg core and the second leg core.
The method according to claim 1,
Wherein the material of the base core and the leg core is a manganese-zinc ferrite alloy.
The method according to claim 1,
Wherein the material of the center core is a nickel-zinc ferrite alloy.
[2] The apparatus of claim 1, wherein the shape of the base core and the leg core comprises:
Wherein the shape of the electromagnetic interference filter is one of a rectangular shape and a toroidal shape.
A base core including a first base core and a second base core opposed to the first base core;
The first and second leg cores including first and second leg cores formed between the first and second base cores, the first and second leg cores being opposed to each other;
A bobbin portion surrounding each of the first and second leg cores and including first and second bobbins having winding regions;
And a first and a second winding coils wound around a winding region of each of the first and second bobbins and connected to a power source, wherein each of the first and second winding coils includes a winding coil portion ; And
A central core formed between the first and second leg cores to provide a leakage path between the first and second base cores; And an electromagnetic interference filter device.
9. The apparatus of claim 8,
Wherein the base core and the leg core are made of a material different from the material of the base core and the leg core.
9. The apparatus of claim 8,
And an electromagnetic interference filter attached to the first and second base cores.
9. The apparatus of claim 8,
Wherein the distance between the first leg core and the second leg core is equal to the distance between the first leg core and the second leg core.
9. The method of claim 8,
Wherein the material of the base core and the leg core is a manganese-zinc ferrite alloy.
9. The method of claim 8,
Wherein the material of the center core is a nickel-zinc ferrite alloy.
[10] The method of claim 8, wherein the shape of the base core and the leg core comprises:
Wherein the shape of the electromagnetic interference filter is one of a rectangular shape and a toroidal shape.
A base core;
The first and second winding coils being wound on both sides of the base core and connected to a power source, wherein each of the first and second winding coils provides a magnetizing inductance and a leakage inductance; And
A center core formed between the first and second winding coils and providing a leakage path between the base cores; And an electromagnetic interference filter device.
16. The method of claim 15,
Wherein the base core is made of a material different from that of the base core.
16. The method of claim 15,
And an electromagnetic interference filter device attached to the base core.
16. The method of claim 15,
And the spacing between the bases on both sides is the same.
16. The method of claim 15,
Wherein the base core material is a manganese-zinc ferrite alloy.
16. The method of claim 15,
Wherein the material of the center core is a nickel-zinc ferrite alloy.
[16] The method of claim 15, wherein the shape of the base core and the leg core comprises:
Wherein the shape of the electromagnetic interference filter is one of a rectangular shape and a toroidal shape.
A base core including a first base core and a second base core opposed to the first base core; and a second base core including first and second leg cores formed to face each other between the first base core and the second base core, Providing a leg core comprising:
Forming a bobbin portion including first and second bobbins having a winding region so as to surround each of the first and second leg cores;
Winding the first and second winding coils on the winding regions of the first and second bobbins to form a winding coil portion; And
Forming a central core between the first and second leg cores to provide a leakage path between the first and second base cores; Wherein the electromagnetic interference filter device comprises:
23. The method of claim 22,
Wherein the base core and the leg core are made of a material different from the material of the base core and the leg core.
23. The method of claim 22, wherein forming the central core comprises:
And attaching the central core to the first and second base cores.
23. The method of claim 22,
Wherein the distance between the first leg core and the second leg core is equal to the distance between the first leg core and the second leg core.
23. The method of claim 22,
Wherein the material of the base core and the leg core is a manganese-zinc ferrite alloy.
23. The method of claim 22,
Wherein the center core material is a nickel-zinc ferrite alloy.
23. The method of claim 22, wherein the shape of the base core and the leg core comprises:
Wherein the electromagnetic interference filter device is one of a square shape and a toroidal shape.
23. The method of claim 22,
Further comprising the step of connecting the coil end of the winding coil part to the fin of the base structure between the step of forming the winding coil part and the step of forming the center core.
23. The bobbin according to claim 22, wherein the first bobbin includes gears and grooves respectively formed at both side edges of the winding region of the first bobbin,
And the second bobbin includes gears and grooves respectively formed at both side edges of the winding region of the second bobbin.
32. The method of claim 30, wherein forming the winding coil section comprises:
Wherein the first and second bobbins are wound around the first and second bobbins by using grooves and gears formed at the edges of the first and second bobbins, respectively.

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