Noise Filter

Abstract

Provide a noise filter. [Solution] The present invention provides a noise filter in which the first and second horizontal portions of the insulator are opened horizontally to open the internal space of the insulator, and a cover body including a core is inserted to attach the insulator to the cover body, and the cover body including the core moves along the first and second vertical portions and enters the insulator until it contacts the top surface of the base, and when the first and second horizontal portions are rotated until they contact the top surface of the cover body, the first connecting portion and the second connecting portion engage with each other to bind the first and second horizontal portions together, and the base includes a plurality of locking grooves located on the bottom surface of the guide groove, and the position of the insulator can be changed based on the circumferential direction of the core by inserting the protrusion of the insulator into any one of the plurality of locking grooves.

Description

[Technical Field]

[0001] The present invention relates to a noise filter with reduced parasitic capacitance. [Background technology]

[0002] 2. Description of the Related Art Electronic devices such as home appliances generate electrical noise, and noise filters are provided in the electronic devices to reduce such electrical noise.

[0003] A noise filter is a device that blocks, absorbs, or bypasses to the ground unwanted electromagnetic waves emitted from electronic devices and leaking out through power lines. Noise filters can filter out electromagnetic interference (EMI) and radio frequency (RF) noise induced from power sources such as switching mode power supplies (SMPS) or other line power outlets.

[0004] A noise filter has two or more coils wound with the same winding around a core. In this case, the magnetic flux generated by the noise filter cancels out each other for differential mode signals, eliminating the inductor effect, while strong magnetic flux is generated in the same direction for common mode signals, creating strong inductance. Therefore, the noise filter can reduce the common mode current and suppress the intensity of noise.

[0005] Meanwhile, since the noise filter is formed in a form in which a coil is wound around a core, a parasitic capacitance may be formed between the wound coils. Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention provides a noise filter that minimizes parasitic capacitance components. [Means for solving the problem]

[0007] In one embodiment, the ferrite core includes a hollow cylindrical ferrite core, a cover surrounding the ferrite core and having a hollow portion formed therein, and a coil wound around the core. The cover includes a cover body surrounding the core and around which the coil is wound, and a plurality of insulators coupled to the cover body to space the wound coils and reduce parasitic capacitance. The insulators each include a ring-shaped base having a flat upper surface, a flat lower surface, and a side surface connecting the upper surface and the lower surface. The insulators are coupled to the base and are used to support the core. the upper surface contacts the lower surface of the cover, the base includes a guide groove formed on the side surface along the circumferential direction of the base, the partition includes a first vertical portion slidably coupled to the guide groove formed on one of both side surfaces of the base, a second vertical portion slidably coupled to the guide groove on the other of both side surfaces of the base, a first horizontal portion extending horizontally on the first vertical portion, and a second horizontal portion extending horizontally on the second horizontal portion, the first vertical portion and the second vertical portion each including a spherical protrusion inserted into the guide groove, The insulator includes a first groove portion formed in a concave shape on an inner surface of an edge formed by the first vertical portion and the first horizontal portion, and a second groove portion formed in a concave shape on an inner surface of an edge formed by the second vertical portion and the second horizontal portion, the first horizontal portion rotates around the first groove portion, the second horizontal portion rotates around the second groove portion, the first horizontal portion includes a first coupling portion arranged at an end portion and having a concave portion and a convex portion continuously positioned therein, the second horizontal portion includes a second coupling portion arranged at an end portion and having a concave portion and a convex portion continuously positioned therein, and the first horizontal portion and the second horizontal portion of the insulator are and the second coupling portion are opened horizontally to open the internal space of the insulator, and the cover body including the core is inserted into the insulator, and the cover body including the core moves along the first vertical portion and the second vertical portion and enters the insulator until it contacts the upper surface of the base. In this state, the first horizontal portion and the second horizontal portion are rotated until they contact the upper surface of the cover body, and the first coupling portion and the second coupling portion are engaged with each other,The first horizontal portion and the second horizontal portion are connected together, and the base includes a plurality of locking grooves located on a bottom surface of the guide groove, and a protrusion of the insulator is inserted into one of the plurality of locking grooves, thereby providing a noise filter in which the position of the insulator can be varied based on the circumferential direction of the core.

[0008] The base may include a plurality of coil grooves formed on a lower surface thereof in which the wound coils are positioned.

[0009] One coil is wound between adjacent insulators in the circumferential direction of the core.

[0010] The insulators are arranged along the radial direction with respect to the center of the core.

[0011] The length of the first horizontal portion is greater than the length of the second horizontal portion and less than the length of the first vertical portion. [Effects of the Invention]

[0012] According to one embodiment of the present invention, a noise filter includes an insulator including a partition wall that minimizes parasitic capacitance components, and the insulator can be easily attached and detached from the cover body, which has the advantage that the number of insulators can be adjusted taking into consideration the number of coil turns, coil thickness, etc. When the number of coil turns is increased to improve noise blocking effect, the insulator can be used to more effectively reduce parasitic capacitance components.

[0013] According to the embodiment, there is an advantage that each space partitioned by the noise filter can be insulated and the parasitic capacitance component between the coils wound in each space can be reduced.

[0014] According to the embodiment, the impedance characteristics can be changed by minimizing the parasitic capacitance component through the partition that separates the coils, which has the advantage of minimizing the change in noise reduction effect depending on the frequency.

[0015] According to the embodiment, by winding the coil in the storage space formed by the partition wall, there is an advantage that the ease of work can be ensured such that the coil is wound at regular intervals.

[0016] According to the embodiment, there is an advantage that by changing the position of the partition wall, the space between the partition wall parts can be adjusted taking into consideration the number of windings of the coil, the thickness of the coil, and the like. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a diagram illustrating a noise filter according to an embodiment. [Figure 2] FIG. 2 is a cross-sectional view of the noise filter shown in FIG. [Figure 3] 1 is a drawing showing an insulator. [Figure 4] FIG. 4 is an exploded view of the insulator shown in FIG. 3. [Figure 5] FIG. [Figure 6] 10 is a view showing a first coupling portion and a second coupling portion of a partition wall portion. [Figure 7] 1 is a diagram showing an initial process of attaching an insulator to a core. [Figure 8] 10 is a diagram showing the latter half of the process of attaching an insulator to a core. [Figure 9] 10 is a view showing a partition portion that moves along a side surface of an insulator base. [Figure 10] 10 is a view showing a partition part whose position is determined by being inserted into a locking groove; [Figure 11] 10 is a view showing a state in which the position of a partition wall is changed; DETAILED DESCRIPTION OF THE INVENTION

[0018] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0019] The embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art, and the following embodiments may be modified into various other forms, and the scope of the present invention is not limited to the following embodiments. Rather, these embodiments are provided to make the present disclosure more complete and thorough, and to fully convey the concept of the present invention to those skilled in the art.

[0020] The terms used in this specification are used to describe particular embodiments and are not intended to limit the present invention.

[0021] As used herein, the singular forms "a," "an," and "the" may include the plural unless the context clearly dictates otherwise. Also, as used herein, the words "comprise" and / or "comprising" specify the presence of a stated feature, number, step, operation, member, element, and / or group thereof, but do not exclude the presence or addition of one or more other features, numbers, operations, members, elements, and / or groups. As used herein, the term "and / or" includes any one and any combination of one or more of the listed items.

[0022] In this specification, terms such as "first" and "second" are used to describe various members, regions, and / or sections, but it is clear that these members, parts, regions, layers, and / or sections should not be limited by these terms. These terms do not imply a particular order, hierarchy, or superiority or inferiority, but are used only to distinguish one member, region, or section from another. Therefore, a first member, region, or section described in detail below may refer to a second member, region, or section without departing from the teachings of the present invention.

[0023] Hereinafter, embodiments of the present invention will be described with reference to the drawings, which schematically illustrate embodiments of the present invention. In the drawings, variations in the shapes shown are expected due, for example, to manufacturing techniques and / or tolerances. Therefore, embodiments of the present invention should not be construed as being limited to the specific shapes of regions shown herein, but should also include variations in shapes that occur during manufacturing, for example.

[0024] The noise filter 100 described below is connected between a power supply and a load and can filter noise from both the power supply line and the return line.

[0025] FIG. 1 is a view showing a noise filter 1 according to an embodiment, and FIG. 2 is a cross-sectional view of the noise filter 1 shown in FIG.

[0026] The noise filter 1 according to the embodiment may be divided into an area connected to a power line and an area connected to a return line, and may be wound with different coils (30, 31, 32).

[0027] Referring to FIGS. 1 and 2, the noise filter 1 may include a hollow cylindrical ferrite core 10, a core 10 including a cover 20 surrounding the ferrite core 10 and having a hollow portion (CL), and a coil 30 wound around the core 10.

[0028] The cover 20 may include a cover body 100 that surrounds the core 10 and on which the coil 30 is wound, and an insulator 200 that protrudes from the cover body 100 .

[0029] The cover body 100 may be made of an insulating material similar to the ferrite core 10. For example, the cover body 100 may be made of a PVC material. However, the present invention is not limited thereto and the cover body 100 may be made of various insulating materials. The cover body 100 may be formed to correspond to the shape of the ferrite core 10, which has a hollow cylindrical shape, and to cover all areas of the ferrite core 10 so that the ferrite core 10 is not exposed to the outside. Specifically, the cover body 100 may be formed to have an inner circumferential surface and an outer circumferential surface, and may have an upper surface and a lower surface connecting the outer circumferential surface and the inner circumferential surface.

[0030] The insulator 200 may be detachably coupled to the cover body 100. The insulator 200 is coupled to the cover body 100 so as to surround the cover body 100, thereby defining a winding space and ensuring a separation distance between the coils 30, thereby minimizing the occurrence of parasitic capacitance.

[0031] A plurality of insulators 200 are provided. The plurality of insulators 200 are arranged at regular intervals along the circumferential direction of the cover body 100. The wound coil 30 may be located between adjacent insulators 200 in the circumferential direction. The coil 30 wound around the cover body 100 may be located to form a separation space (SO) with the insulator 200 at a predetermined distance in the circumferential direction. The plurality of insulators 200 have the same shape and size.

[0032] If the core 10 is a single-phase core 10, the insulator 200 divides the core 10 into two regions based on the circumferential direction. For example, if the core 10 is a three-phase core 10, the insulator 200 can divide the core 10 into a space that accommodates a portion of the R-phase coil 30, a space that accommodates a portion of the S-phase coil 30, a space that accommodates a portion of the T-phase coil 30, and a space that accommodates a portion of the neutral coil 30. The coils 30 are wound in a distributed manner in the spaces divided by the insulator 200 in this manner.

[0033] The inductance capacity of the core 10 may vary depending on the number of turns of the coil 30 wound around the core 10. Specifically, as the number of turns of the coil 30 increases, the inductance capacity of the core 10 increases. Meanwhile, as the number of turns of the coil 30 increases, the distance between the coils 30 wound around the core 10 decreases. When the distance between the coils 30 wound around the core 10 decreases, a parasitic capacitance component may occur, and the generated parasitic capacitance component changes the impedance depending on the frequency. The insulator 200 may prevent the distance between the wound coils 30 from becoming too close, thereby reducing the generation of parasitic capacitance.

[0034] The specific configuration of the insulator 200 is as follows.

[0035] FIG. 3 is a view showing the insulator 200, and FIG. 4 is an exploded view of the insulator 200 shown in FIG.

[0036] 3 and 4, the insulator 200 may include one base 210 and a plurality of partition walls 220. The base 210 is a hollow cylindrical member and may contact the lower surface of the cover body 100. The base 210 may have a ring shape and may include a flat upper surface 211, a flat lower surface 212, and a side surface 213 connecting the upper surface 211 and the lower surface 212. The shape and size of the base 210 may correspond to the shape and size of the lower surface of the cover body 100.

[0037] The plurality of partitions 220 are positioned at regular intervals around the periphery of the base 210. Each partition 220 may be detachably coupled to the base 210. Alternatively, each partition 220 may be slidably coupled to the base 210. As a result, the position of the partition 220 may be changed along the base 210.

[0038] The partition 220 may be formed to surround the top and both side surfaces of the cover body 100. Specifically, the partition 220 may include a first vertical portion 221, a second vertical portion 222, a first horizontal portion 223, and a second horizontal portion 224. It should be noted that the first vertical portion 221, the second vertical portion 222, the first horizontal portion 223, and the second horizontal portion 224 are described separately based on their shapes and functional characteristics, and are a single means connected to each other vertically.

[0039] The first horizontal portion 223 extends horizontally from the upper end of the first vertical portion 221. The second horizontal portion 224 extends horizontally from the upper end of the second horizontal portion 224. The first horizontal portion 223 and the second horizontal portion 224 are members spaced apart from each other and are formed to engage with each other when the insulator 200 is attached to the cover body 100.

[0040] The first vertical portion 221, the second vertical portion 222, the first horizontal portion 223, and the second horizontal portion 224 are all made of an insulating material, but may be made of a material that is elastically deformable to some extent.

[0041] The core 10 and the cover body 100 are positioned in an inner space formed by the first vertical portion, the second vertical portion 222, the first horizontal portion 223, the second horizontal portion 224, and the base 210. The first vertical portion 221 and the second vertical portion 222 may be slidably coupled to the side surface of the base 210. A guide groove (GG) may be formed on the side surface of the base 210. The guide groove (GG) may be formed along the side surface of the base 210 to form a ring shape in the circumferential direction of the base 210.

[0042] FIG. 5 is a cross-sectional side view of the insulator 200.

[0043] 5, the partition wall portion 220 of the insulator 200 includes a first groove portion G1. The first groove portion G1 is formed in a concave shape on the inner surface of the edge formed by the first vertical portion 221 and the first horizontal portion 223. The first horizontal portion 223 can rotate around the first groove portion G1 as the periphery of the first groove portion G1 is deformed.

[0044] The partition wall portion 220 of the insulator 200 includes a second groove portion (G2). The second groove portion (G2) is formed in a concave shape on the inner surface of the edge formed by the second vertical portion 222 and the second horizontal portion 224. The second horizontal portion 224 can rotate around the second groove portion (G2) as the periphery of the second groove portion (G2) is deformed.

[0045] The length (L1) of the first horizontal portion 223 is greater than the length (L2) of the second horizontal portion 224 and is smaller than the length of the first vertical portion 221.

[0046] Meanwhile, a coil groove (CG) through which the wound coil 30 passes may be formed on the lower surface of the base 210 .

[0047] Meanwhile, the first vertical portion 221 and the second vertical portion 222 each include a protrusion (P). The protrusion (P) protrudes from the inner surface of the first vertical portion 221 that faces the side surface of the base 210. The protrusion (P) protrudes from the inner surface of the second vertical portion 222 that faces the side surface of the base 210. The protrusion (P) is inserted into a guide groove (GG) formed in the side surface of the base 210. As the protrusion (P) moves along the guide groove (GG), the circumferential position of the partition portion 220 is changed.

[0048] FIG. 6 is a view showing the first coupling portion (k1) and the second coupling portion (k2) of the partition wall portion 220. As shown in FIG.

[0049] Referring to FIG. 6, the partition wall 220 includes a first coupling portion (k1) and a second coupling portion (k2).

[0050] The first connecting portion (k1) has a first horizontal portion 223 disposed at an end thereof, and a concave portion and a convex portion are continuously positioned. Both the concave portion and the convex portion of the first connecting portion (k1) correspond to curved surfaces.

[0051] The second connecting portion (k2) has a concave portion and a convex portion that are continuously positioned at the end of the second horizontal portion 224. Both the concave portion and the convex portion of the second connecting portion (k2) correspond to curved surfaces.

[0052] The first connecting portion (k1) and the second connecting portion (k2) serve to bind the first horizontal portion 223 and the second horizontal portion 224 which are separated from each other.

[0053] FIG. 7 is a view showing an initial process of mounting the insulator 200 on the core 10. As shown in FIG.

[0054] 7, the core 10 and the cover body 100 are integrally molded. The first horizontal portion 223 and the second horizontal portion 224 of the insulator 200 are horizontally opened to expose the internal space of the insulator 200, and the core 10 and the cover body 100 are inserted into the insulator 200, thereby attaching the insulator 200 to the cover body 100. The cover body 100 including the core 10 can move along the first vertical portion 221 and the second vertical portion 222 and enter the insulator 200 until it contacts the top surface of the base 210.

[0055] FIG. 8 is a view showing the latter half of the process of mounting the insulator 200 on the core 10. As shown in FIG.

[0056] 8, when the cover body 100 including the core 10 is inserted until it contacts the top surface of the base 210, the first and second horizontal portions 223 and 224 are rotated until they contact the top surface of the cover body 100. As the first and second horizontal portions 223 and 224 contact the top surface of the cover body 100, the first coupling portion (k1) of the first horizontal portion 223 and the second coupling portion (k2) of the second horizontal portion 224 engage with each other, thereby binding the first and second horizontal portions 223 and 224 to each other, and the insulator 200 can be completely coupled to the cover body 100.

[0057] In this manner, when the insulator 200 is completely coupled to the cover body 100, the partition wall 220 moves along the side of the base 210, so that the position of the insulator 200 can be changed.

[0058] FIG. 9 is a view showing the partition part 220 moving along the side of the base 210 of the insulator 200, and FIG. 10 is a view showing the partition part 220 being inserted into the locking groove (HG) to determine its position.

[0059] 9 and 10, the base 210 may include a plurality of locking grooves (HG). The locking grooves (HG) are located in the guide grooves (GG). The locking grooves (HG) may be recessed in the bottom surface of the guide grooves (GG). The plurality of locking grooves (HG) may be located at regular intervals along the guide grooves (GG). When the insulator 200 is attached to the cover body 100, as the partition portion 220 moves along the guide grooves (GG), the protrusions (P) of the partition portion 220 are inserted into the locking grooves (HG), and the position of the partition portion 220 is temporarily determined in accordance with the position of the locking grooves (HG). When additional force is applied to the partition portion 220 to move the protrusions (P) out of the locking grooves (HG), the partition portion 220 moves to the next locking groove (HG).

[0060] FIG. 11 is a view showing a state in which the position of the partition wall 220 is changed.

[0061] 11, a plurality of insulators 200 are arranged in a radial direction based on the center of the core 10. One coil 30 is wound between adjacent insulators 200 based on the circumferential direction of the core 10. Alternatively, a plurality of coils 30 are wound between adjacent insulators 200.

[0062] Because the insulator 200 is formed to slide freely along the base 210, the position of the insulator 200 can be changed taking into account the number of turns of the coil 30 or the diameter of the coil 30. By adjusting the position of the insulator 200, the number of spaces for independently winding the coil 30 can be increased or decreased depending on the conditions of the coil 30. Also, some insulators 200 can be separated from the cover body 100 to increase the winding space of the coil 30 but decrease the number of winding spaces, or some insulators 200 can be additionally attached to the cover body 100 to increase the number of winding spaces for the coil 30 but decrease the corner winding space of the coil 30.

[0063] Such an insulator 200 separates the wound coils 30 to secure an independent winding space, thereby minimizing the occurrence of parasitic capacitance while increasing the number of turns of the coil 30.

[0064] While specific embodiments of the noise filter 1 of the present invention have been described above, it is obvious that various modifications can be made without departing from the scope of the present invention.

[0065] Therefore, the scope of the present invention should be determined not only by the described embodiments, but also by the claims set forth below and their equivalents.

[0066] In other words, it should be understood that the above-described embodiments are illustrative in all respects and not limiting, and the scope of the present invention is indicated by the claims below rather than by the detailed description, and all modifications and variations derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention. [Explanation of symbols]

[0067] 10: Core 20: Cover 30: Coil 100: Cover body 200: Insulator 210: Bass 211:Top surface 212: Bottom surface 213: Side 220: Partition wall part 221: First vertical section 222: Second vertical section 223: 1st horizontal part 224:Second horizontal part GG: Guide groove G1: First groove G2: 2nd groove HG:Latching groove k1: 1st joint k2: 2nd joint CG: Coil groove

Claims

1. The coil includes a hollow cylindrical ferrite core, a cover surrounding the ferrite core and having a hollow portion formed therein, and a coil wound around the core, the cover includes a cover body surrounding the core and around which the coil is wound, and a plurality of insulators coupled to the cover body to space the wound coils and reduce parasitic capacitance; the insulator has a ring shape and includes a base having a flat upper surface, a flat lower surface, and a side surface connecting the upper surface and the lower surface; and a plurality of partition walls connected to the base and surrounding the core, the upper surface being in contact with the lower surface of the cover; the base includes a guide groove formed on the side surface along a circumferential direction of the base, and the partition wall includes a first vertical portion slidably coupled to the guide groove formed on one of both side surfaces of the base, a second vertical portion slidably coupled to the guide groove on the other of both side surfaces of the base, a first horizontal portion extending horizontally from the first vertical portion, and a second horizontal portion extending horizontally from the first horizontal portion; the first vertical portion and the second vertical portion each include a spherical protrusion inserted into the guide groove, the insulator includes a first groove portion formed in a concave shape on an inner surface of an edge formed by the first vertical portion and the first horizontal portion, and a second groove portion formed in a concave shape on an inner surface of an edge formed by the second vertical portion and the second horizontal portion, the first horizontal portion rotates around the first groove portion, and the second horizontal portion rotates around the second groove portion, the first horizontal portion includes a first connecting portion disposed at an end portion and having a concave portion and a convex portion continuously positioned therein, and the second horizontal portion includes a second connecting portion disposed at an end portion and having a concave portion and a convex portion continuously positioned therein; When the first horizontal portion and the second horizontal portion of the insulator are horizontally opened to open the internal space of the insulator, the cover body including the core is inserted, and the insulator is attached to the cover body. The cover body including the core moves along the first vertical portion and the second vertical portion and enters the insulator until it contacts the upper surface of the base. When the first horizontal portion and the second horizontal portion are rotated until they contact the upper surface of the cover body, the first coupling portion and the second coupling portion engage with each other to bind the first horizontal portion and the second horizontal portion together. The base includes a plurality of locking grooves located on a bottom surface of the guide groove, The noise filter, wherein the position of the insulator is variable based on the circumferential direction of the core by inserting the protrusion of the insulator into any one of the plurality of locking grooves.

2. The noise filter according to claim 1 , wherein the base includes a plurality of coil grooves formed on a lower surface thereof, in which the wound coils are positioned.

3. 3. The noise filter according to claim 2, wherein one coil is wound between adjacent insulators in the circumferential direction of the core.

4. The noise filter according to claim 3 , wherein the insulators are arranged along a radial direction with respect to the center of the core.

5. The noise filter according to claim 4 , wherein the length of the first horizontal portion is greater than the length of the second horizontal portion and less than the length of the first vertical portion.

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