KR102250787B1 - Emi filter - Google Patents

Abstract

The present invention relates to an EMI filter capable of firmly fixing a core, wherein the EMI filter according to the present invention comprises: a housing; A core support unit comprising a plate having a plurality of insertion grooves formed thereon and a support leg that supports the plate on both sides of the plate and is fixed to a lower surface of the housing; A plurality of toroidal cores having a lower surface inserted into the insertion groove and fixed on the core support unit; A fixture having both sides bent, and the bent portions are attached to edges of the plurality of toroidal cores to prevent the toroidal core from moving; And a band for binding and fixing the toroidal core and the fixture to the core support unit.

Description

EMI filter {EMI FILTER}

The present invention relates to an EMI filter, and more particularly, to an EMI shielding filter capable of rigidly fixing a toroidal core using a bracket and a holder.

The EMI filter is a filter that is installed in an electronic product to remove electromagnetic waves. It passes signals necessary for circuit operation and removes noise.

The EMI filter is a structure in which a toroidal-shaped core and a bus bar for connection with an external circuit are connected.

Published Utility Model No. 20-2011-0004705, "High-current EMI filter having a winding structure with integrated busbar" discloses an EMI filter in which a busbar penetrates a toroidal core and integrally forms a busbar.

However, in this conventional structure, in order to fix the toroidal core to the housing, it is fixed using a molding compound such as epoxy resin. The fixing method by molding is not only difficult to process, but also has a problem in that properties deteriorate and the total weight of the product increases due to the weight of the epoxy resin.

In particular, in recent years, electronic products are becoming smaller and lighter, but the fixing method by molding has difficulty in weight reduction.

(01) Republic of Korea Utility Model Publication No. 20-2011-000475, High-current EMI filter with integrated busbar winding structure, Publication date: 2011.05.12 (02) Korean Patent Laid-Open No. 10-2018-0080093, Inductor and EMI filter including the same, Publication date: 2018.07.11

The problem to be solved by the present invention is to provide an EMI filter capable of firmly fixing a toroidal core without using a molding compound.

Another problem to be solved by the present invention is to provide an EMI filter that is easy to manufacture and can be lightened.

An EMI filter according to an embodiment of the present invention includes a housing; A core support unit spaced apart from and fixed to the lower surface of the housing; A plurality of toroidal cores extending from a core support portion coupled to an upper portion of the core support unit and a core portion extending through the core support portion and having a hollow shape; A fixture having both sides bent, and the bent portions are attached to edges of the plurality of toroidal cores to prevent the toroidal core from moving; And a band that binds and fixes the fastener to the core part.

In an embodiment of the present invention, the plurality of toroidal cores are installed to be spaced apart from each other, and the fixture is formed in the spaced apart from each other, so that a gap preventing portion protruding from the gap is prevented.

In an embodiment of the present invention, the width of the gap preventing portion is the same as the separation distance of the toroidal cores.

In an embodiment of the present invention, a band insertion groove for inserting the band is formed in a bent portion of the fixture, and a chamfering portion is formed in the band insertion groove by bending the edge portion of the band inclined. It is characterized by having.

In an embodiment of the present invention, a PCB fixing rib for fixing a PCB is protruded above one side of the plate.

In an embodiment of the present invention, the end of the band includes a plurality of slits formed at regular intervals and a worm gear having a spiral thread equal to the slit interval, and the band is tightened while the worm gear rotates.

According to the present invention, since the toroidal core is fixed to the housing without using a molding compound such as epoxy, there is an effect of lightening the EMI filter.

In addition, the conventional molding method has a problem that it takes a long time due to the compound operation and hardening time, but according to the present invention, such a procedure is omitted, thereby reducing the working process.

Further, according to the present invention, it is possible to prevent the occurrence of deterioration in properties.

Further, according to the present invention, there is an effect of preventing the core from shaking.

1 shows the structure of an EMI filter according to an embodiment of the present invention.
2 is an exploded perspective view and a side view of the toroidal core portion of FIG. 1.
3 shows a structure of an EMI filter according to another embodiment of the present invention.
4 is an exploded perspective view of a toroidal core portion according to the embodiment of FIG. 3.
5 shows a detailed view of the tightening unit according to the embodiment of FIG. 3.

In the present invention, various modifications may be made and various embodiments may be provided, and specific embodiments will be illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to a specific embodiment, it should be understood to include all changes, equivalents, and substitutes included in the spirit and scope of the present invention. In describing the present invention, when it is determined that a detailed description of a related known technology may obscure the subject matter of the present invention, a detailed description thereof will be omitted.

Terms such as first, second, A, and B may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another component. For example, without departing from the scope of the present invention, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element. The term and/or includes a combination of a plurality of related listed items or any of a plurality of related listed items.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present application, terms such as "comprise" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, but one or more other features. It is to be understood that the presence or addition of elements or numbers, steps, actions, components, parts, or combinations thereof does not preclude in advance.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram showing the structure of an EMI filter according to an embodiment of the present invention, showing a state in which the upper part of the housing of the EMI filter is removed, FIG. 2 is an exploded perspective view and a side view of the main part, and FIG. 3 is A structure of an EMI filter according to another embodiment of the present invention is shown, and FIG. 4 is an exploded perspective view of a toroidal core according to the embodiment of FIG. 3, and FIG. 5 is a fastening part according to the embodiment of FIG. 3. It shows a detailed view.

Referring to the drawings, the EMI filter according to the first embodiment includes a housing 100, a core support unit 200 coupled to the housing, a plurality of toroidal cores 300 coupled to the core support unit 200, A fixture 400 for preventing the plurality of toroidal cores from shaking, and a band 500 for binding and coupling the toroidal core 300 and the fixture 400 to each other.

The housing 100 is a part corresponding to the case of the EMI filter and may be made of a metal material, and is generally in a rectangular shape, but is not limited thereto. 1 shows a state in which the upper cover is removed from the housing. In addition, grooves through which the bus bar 10 can pass are formed on both side surfaces of the housing 100. A plurality of bus bars 10 may be coupled, and the bus bars 10 are insulated from the housing 100.

The core support unit 200 may include a support leg 210 fixed to a lower surface of the housing, and a plate 220 bent at the support leg and spaced apart from the lower surface of the housing and formed flat. Accordingly, the plate 220 may be spaced apart from the lower surface of the housing by the height of the support leg 210. At this time, the spaced distance, that is, the height of the plate 220 can be freely changed at the time of design and can be fixed using the femnut 213.

A PCB fixing rib 230 for fixing a PCB (printed circuit board) protrudes from one side of the upper portion of the plate 220. In addition, a screw hole 232 for fastening a PCB may be formed in the PCB fixing rib 230. The PCB fixing ribs 230 may be spaced apart to form a pair, and may be formed on one side of the plate 220. At this time, the surface on which the PCB fixing rib 230 is formed is a surface on which the support leg 210 is not formed.

By forming the PCB fixing rib 210 on the plate 220 as described above, it is possible to more easily fix the PCB.

The toroidal core 300 has a donut shape and a hollow is formed in the central portion, and the bus bar 10 penetrates the hollow. The toroidal core 300 is a magnetic core and provides an inductor component. Two or more toroidal cores 300 may be formed, and may be spaced apart from each other.

The toroidal core 300 may include a first toroidal core 310 and a second toroidal core 320 and are disposed to be spaced apart from each other by a predetermined width. In this embodiment, the second toroidal core 320 includes two toroidal cores, but is not spaced apart and is integrally formed, and thus is expressed as one second core.

The toroidal core 300 includes a core support portion 330 fixed to the core support unit 200 and a core portion 340 integrally extended to the core support portion. The core part 340 is formed with a hollow so that the bus bar 10 penetrates through the core part 340. Two of the core support portions 330 are formed to be spaced apart at regular intervals to stably support the core portion 340. In addition, the core support 330 may be fixed to the plate 220 with a nut 312. That is, the core support part 330 may be firmly fixed to the plate 220 using the nut 312 while the bolt penetrates the lower surface of the core support part 330 under the plate 220.

The fixture 400 is for preventing the plurality of toroidal cores from shaking in a horizontal direction, and is bent at both edges to prevent separation of the core 410 is formed. In addition, as shown, the toroidal cores are disposed to be spaced apart from each other, and a gap preventing portion 420 for preventing a gap is protruded at a portion corresponding to the spaced toroidal cores. The gap prevention part 420 prevents a gap between the two cores and prevents the toroidal core from shaking. The width H of the gap prevention part 420 is formed equal to the spaced distance between the two cores 310 and 320. Accordingly, the gap prevention part 420 is inserted between the spaced gaps between the first toroidal core 310 and the second toroidal core 320 to prevent the toroidal core 300 from shaking in the horizontal direction. The toroidal core 300 may have various widths or number of cores depending on the purpose and type used. For example, if three cores are used and are spaced apart from each other, two gap prevention units 420 may be formed at corresponding positions.

A band insertion groove 412 is formed in the bent portion of the separation prevention part 410. The band 500 is inserted into the band insertion groove 412 so that the fixture 400 can be firmly fixed to the core part 300. The band insertion groove 412 is preferably formed to be the same as the width of the band 500 or slightly wider than the width of the band 500.

The band 500 is coupled by binding the toroidal core 300 and the fixture 400. A tightening part 510 is formed on one side of the band, so that the band can be tightly bound. The tightening part 510 may be firmly fixed while pulling one side while the fastener 400 is placed on the core part 310 in the form of a tie band.

In addition, the corner portion of the band 500 is formed with a chamfering portion 520 bent inclined to be inserted into the band insertion groove 412. The chamfered portion 520 may prevent the band 500 from slipping by inserting the band insertion groove 412, and the fastener 400 may be more rigidly fixed.

So far, the configuration of the EMI filter according to the first embodiment of the present invention has been described.

With the above configuration, the toroidal core can be firmly fixed to the housing without using a molding compound such as an epoxy resin.

Looking at the fixed principle, the core support unit 200, the housing 100 is firmly fixed by a femnut, and the core support 330 is firmly fixed to the plate 220 of the core support unit 200 by a nut. The core part 330 is integrally connected to the core support part 330 so that the toroidal core 300 may be firmly fixed to the core support unit 200.

In order to prevent the toroidal core 300 from shaking in a fixed state, the fixture 400 and the band 500 are used.

In addition, the separation prevention portions 410 formed on both sides of the fixture 400 prevent the toroidal core 300 from moving outside the separation prevention portion 410. When the toroidal cores 300 are disposed to be spaced apart from each other, the desired effect cannot be achieved only with the departure prevention unit 410. Therefore, in the present invention, by adding a gap preventing portion 420 having the same width as the separation distance of the toroidal core, it is possible to prevent a plurality of spaced cores from being shaken by the gap.

And by using the band 500, the fixture 400 can be firmly fixed to the toroidal core 300, and at the same time, the toroidal core 300 can also be firmly fixed to the core support unit 200. At this time, in order to prevent the band 500 from slipping on the surface of the core part 310, a band insertion groove 412 is formed in the bent part of the separation prevention part 410, and the edge part of the band 500 is inclined. By giving the edge portion can be inserted into the band insertion groove 412.

Since the band 500 must be made of a metal material, it is not easy to manipulate the band.In the present invention, a tightening part 510 is formed at the end of the band to facilitate the operation of tightening or loosening the band 500. have. The tightening part 510 may be tightened while pulling one side in a tie band structure, or may be tightened using a worm gear as in the second embodiment to be described later.

Next, a second embodiment will be described with reference to FIGS. 3 to 5. For the same function or structure, the same reference numerals as in the first embodiment are used.

The EMI filter according to the second embodiment includes a housing 100, a core support unit 200 coupled to the housing, a plurality of toroidal cores 300 coupled to the core support unit 200, and the plurality of toroidals. It includes a fixture 400 for preventing the core from shaking, and a band 500 that binds and couples the core support unit 200, the toroidal core 300, and the fixture 400 to each other.

The housing 100 is the same as the first embodiment.

A plurality of core insertion grooves 221 are formed in the plate 220 of the core support unit 200, and a slit-shaped band insertion groove ( 222) may be formed.

The support leg 210 and the plate 220 are integrally formed. The plate 220 may be installed to be spaced apart from the lower surface of the housing 100 by the support legs 210. The distance apart, that is, the height of the plate 220 can be freely changed at the time of design and can be fixed using the femnut 213. In addition, the core insertion groove 221 may have a rectangular shape, and may be variously changed in size according to the height of the support leg 210 and the size of the core.

A PCB fixing rib 230 for fixing a PCB (printed circuit board) protrudes from one side of the upper portion of the plate 220, which is the same as the previous embodiment.

The fixture 400 is for preventing the plurality of toroidal cores from shaking in a horizontal direction, and is bent at both edges to prevent separation of the core 410 is formed. As shown, the toroidal cores are disposed to be spaced apart from each other, and a gap preventing portion 420 for preventing a gap is protruded in a portion corresponding to the spaced apart toroidal cores. The gap prevention part 420 prevents a gap between the two cores and prevents the toroidal core from shaking. The configuration of the departure prevention unit 410 and the gap prevention unit 420 is the same as in the above-described embodiment.

The band 500 binds and couples the core 300 and the fixture 400 while penetrating the band insertion groove 222 formed in the plate 220.

The band 500 has a belt shape made of a metal material, and a fastening part 510 is formed at the end. The toroidal core 300 may be prevented from shaking by firmly binding the core 300 and the fixture 400 to the core support unit 200 by the tightening portion 510.

At the end of the band 500, a plurality of slits 511 are formed at regular intervals. In addition, it includes a worm gear 512 in which a spiral thread 514 formed at the same interval as the slit 511 is formed. Therefore, when the worm gear 512 is rotated, the screw wire 514 moves along the slit 511 and the band can be tightly tightened.

In addition, the tightening part 510 may include a cover 513 for fixing the worm gear 512 to the band.

According to the above structure, when the worm gear 512 is turned clockwise, the band is tightly tightened while the worm gear 512 proceeds in the A direction. Conversely, when the worm gear 512 is turned counterclockwise, the worm gear 512 is The band loosens while proceeding in the direction B.

So far, the configuration of the EMI filter according to the second embodiment of the present invention has been described.

With the above configuration, the toroidal core can be firmly fixed to the housing without using a molding compound such as an epoxy resin.

Looking at the fixed principle, the core support unit 200, the housing 100 is firmly fixed by a femnut, a core insertion groove 221 is formed in the plate 220 of the core support unit 200, and Since the lower surface of the core 300 is inserted into the core insertion groove 221, the core has a circular shape, but it can be prevented from moving by being inserted into the plate.

In addition, the separation preventing portions 410 formed on both sides of the fixture 400 prevents the toroidal core 300 from moving outside the fixture 400. When the toroidal cores are disposed to be spaced apart from each other, the desired effect cannot be achieved only with the separation prevention unit 410. Therefore, in the present invention, by adding a gap preventing portion 420 having the same width as the separation distance of the toroidal core, it is possible to prevent a plurality of spaced cores from being shaken by the gap.

And by using the band 500, the fixture 400 can be firmly fixed to the toroidal core 300, and at the same time, the toroidal core 300 can also be firmly fixed to the core support unit 200. Since the band 500 must be made of a metal material, it is not easy to manipulate the band.In the present invention, a tightening part 510 is formed at the end of the band to facilitate the operation of tightening or loosening the band 500. have. That is, as described above, by forming a slit 511 in the band and forming a worm gear 512 having a spiral corresponding to the slit, the band can be tightened or released while rotating the worm gear.

Therefore, according to the present invention, since the conventional epoxy resin is not used, the overall weight of the EMI filter is lighter than when using the epoxy resin, and the PCB fixing rib 230 is formed on the core support unit 200 to improve the PCB. Can be easily combined.

In addition, in the case of using an epoxy resin, it takes a certain time to cure, so that the entire work process is lengthened, but in the present invention, since only devices such as a core support unit, a fixture, and a band need to be installed, the work is much faster than the conventional one.

In addition, there is an effect that the filter characteristics are not reduced while the core is firmly fixed compared to the prior art by a structure such as a fixture and a band.

As described above, by forming a slit 511 in the band and forming a worm gear 512 having a spiral corresponding to the slit, the band can be tightened or released while rotating the worm gear.

Therefore, according to the present invention, since the conventional epoxy resin is not used, the overall weight of the EMI filter is lighter than when using the epoxy resin, and the PCB fixing rib 230 is formed on the core support unit 200 to improve the PCB. Can be easily combined.

In addition, in the case of using an epoxy resin, it takes a certain time to cure, so that the entire work process is lengthened, but in the present invention, only devices such as a core support unit, a fixture, and a band need to be installed, so that the operation is much faster than in the prior art.

In addition, there is an effect that the filter characteristics are not reduced while the core is firmly fixed compared to the prior art by a structure such as a fixture and a band.

Although the embodiments have been described above, these are only examples and do not limit the present invention, and those of ordinary skill in the field to which the present invention belongs are not exemplified above without departing from the essential characteristics of the present embodiment. It will be seen that various modifications and applications are possible. For example, each component specifically shown in the embodiment can be modified and implemented. And differences related to these modifications and applications should be construed as being included in the scope of the present invention defined in the appended claims.

100: housing 200: core support unit
210: support leg 220: plate
300: toroidal core 400: fixture
410: departure prevention unit 420: play prevention unit
500: band 510: fastener

Claims (9)

housing;
A core support core support unit including a support leg fixed to a lower surface of the housing and a plate bent at the support leg and spaced apart from the lower surface of the housing and formed flat;
A plurality of toroidal cores fixed to the core support unit;
A fixture having both sides bent and the bent portions are attached to edges of the plurality of toroidal cores to prevent the toroidal core from moving; And
It includes a band for binding and fixing the fixture to the toroidal core,
A plurality of core insertion grooves are formed in the plate,
The toroidal core is inserted into the core insertion groove and fixed to the plate,
Band insertion grooves are formed on both sides of the core insertion groove on the plate,
EMI filter, characterized in that the band penetrates the band insertion groove to fix the toroidal core and the plate. The EMI filter of claim 1, wherein the toroidal core includes a core support portion coupled to the plate and a core portion extending and forming a hollow core portion. The method of claim 1,
The plurality of toroidal cores are installed to be spaced apart from each other,
EMI filter, characterized in that the fixture is formed in the spaced apart from each other so that a gap prevention part protrudes to prevent a gap. The method of claim 3,
EMI filter, characterized in that the width of the gap prevention part is the same as the separation distance of the toroidal cores The method of claim 1,
A band insertion groove for inserting the band is formed in the bent portion of the fixture,
EMI filter, characterized in that the edge portion of the band is bent inclined to form a chamfered portion inserted into the band insertion groove. The method of claim 1,
EMI filter, characterized in that the PCB fixing rib for fixing the PCB protrudes above one side of the plate. delete delete The method of claim 1,
A plurality of slits formed at regular intervals at the ends of the band;
A worm gear having a spiral thread equal to the slit spacing, and
Including a tightening portion including a cover for fastening the worm gear to the band,
EMI filter, characterized in that tightening the band while the worm gear rotates.

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