KR102536830B1 - Inductor and emi filter comprising the same - Google Patents

Abstract

An inductor according to an embodiment of the present invention includes a toroidal-shaped core, an upper bobbin surrounding an upper surface, an outer circumferential surface, and an inner circumferential surface of the core, and a lower bobbin disposed on a lower surface of the core, wherein the upper bobbin has a first spaced apart from each other on the outside. -1st conductive pattern and 1-2nd conductive pattern are disposed, and when the lower bobbin is combined with the upper bobbin, it is connected to the 1-1st conductive pattern to form a first winding and the 2-1st conductive pattern and the 1st- A 2-2 conductive pattern connected to the 2 conductive patterns to form a second winding may be disposed on the upper surface.

Description

Inductor and EMI filter including the same {INDUCTOR AND EMI FILTER COMPRISING THE SAME}

The present invention relates to an inductor and an EMI filter including the same.

An inductor is one of electronic components applied on a printed circuit board, and may be applied to a resonant circuit, a filter circuit, a power circuit, etc. due to its electromagnetic characteristics.

On the other hand, an EMI (Electro Magnetic Interference) filter applied to the power board serves to pass signals required for circuit operation and remove noise.

1 shows a block diagram of a general power board to which an EMI filter is applied connected to a power source and a load.

The type of noise transmitted from the power board of the EMI filter shown in FIG. 1 can be largely divided into radiated noise of 30 MHz to 1 GHz radiated from the power board and conductive noise of 150 kHz to 30 MHz conducted through the power line. .

The transmission method of conductive noise can be divided into a differential mode and a common mode. Among them, common mode noise returns in a large loop even if it is small, so it can affect electronic devices that are far away. Such common mode noise is sometimes caused by impedance unbalance in a wiring system, and becomes more prominent in a high-frequency environment.

In order to remove common mode noise, an inductor applied to the EMI filter shown in FIG. 1 generally uses a toroidal-shaped magnetic core including an Mn-Zn-based ferrite material. Since Mn-Zn-based ferrite has high magnetic permeability at 100 kHz to 1 MHz, common mode noise can be effectively removed.

2 shows a perspective view of a general inductor 100 .

Referring to FIG. 2 , the inductor 100 may include a magnetic core 110 and a coil 120 wound on the magnetic core 110 .

The magnetic core 110 may have a toroidal shape, and the coil 120 includes a first coil 122 wound on the magnetic core 110 and a second coil 122 wound opposite to the first coil 122. Coil 124 may be included. Each of the first coil 122 and the second coil 124 may be wound on an upper surface S1 , a side surface S2 , and a lower surface S3 of the magnetic core 110 having a toroidal shape.

The magnetic core 110 may further include a bobbin (not shown) to insulate the coil 120, and the coil 120 may be formed of a conducting wire whose surface is coated with an insulating material.

FIG. 3 is an exploded perspective view when the magnetic core shown in FIG. 2 further includes a bobbin, and FIGS. 4 (a) and 4 (b) show perspective views of the magnetic core shown in FIG. 3 .

Referring to FIG. 3 , the magnetic core 110 may be accommodated in the bobbin 130 . The bobbin 130 may include an upper bobbin 132 and a lower bobbin 134 .

Next, referring to FIG. 4 (a), as shown in FIG. 3, in a state in which the upper bobbin 132, the magnetic core 110, and the lower bobbin 132 are provided, the magnetic core 110 is placed on the bottom surface of the lower bobbin 132. ) can be placed. Then, as shown in FIG. 4 (b), the upper bobbin 131 may be coupled to the result shown in FIG. 4 (a). At this time, each component may be adhered to each other through an adhesive material.

However, since such a ferrite core has a generally closed curved planar shape such as a toroidal shape, one end of the wire to be wound is always around the inner circumferential surface (ie, hollow) of the magnetic core 110 or bobbin 130 in the thickness direction. (eg, in the x-axis direction) as many times as the number of turns. Accordingly, the winding speed and efficiency of the magnetic core 110 having a polygonal or closed curved planar shape is lower than that of a magnetic core having a planar shape with an opening. In particular, in the case of a wire having a relatively small diameter (eg, 0.3 to 0.4 mm), it may be wound after being processed into a spring shape through wire bending, but in the case of a wire having a larger diameter (eg, 1 mm or more), bending is easy. Therefore, it is difficult to apply a method of processing into a spring shape, and there is a problem in that production efficiency is greatly reduced.

In order to solve this problem, a thin film coil in the form of drawing a concentric circle is applied or a method of alternately stacking the thin film coil with an insulating member has been devised. However, in any case, since the two-dimensional pattern cannot be substantially escaped, there is a limit to the core design, and in particular, there is a problem in that it cannot be applied to the toroidal-shaped core as shown in FIG. 2 .

A technical problem to be achieved by the present invention is to provide an inductor including a thin film coil that can correspond to various core shapes and does not require a separate winding process, and an EMI filter including the same.

An inductor according to an embodiment may include a toroid toroidal-shaped core; an upper bobbin surrounding an upper surface, an outer circumferential surface, and an inner circumferential surface of the core; and a lower bobbin disposed on a lower surface of the core, wherein a 1-1 conductive pattern and a 1-2 conductive pattern spaced apart from each other are disposed on an outer surface of the upper bobbin, and the lower bobbin is coupled to the upper bobbin. a 2-1 conductive pattern connected to the 1-1 conductive pattern to form a first winding and a 2-2 conductive pattern connected to the 1-2 conductive pattern to form a second winding are disposed on the upper surface. It can be.

For example, the inductor may further include a conductive bonding portion disposed between the lower surface of the core and the upper surface of the lower bobbin.

For example, the 1-1st conductive pattern and the 2-1st conductive pattern, and the 1-2nd conductive pattern and the 2-2nd conductive pattern may be electrically connected through the conductive bonding portion.

For example, the upper bobbin and the lower bobbin may be coupled through the conductive bonding portion.

For example, the conductive bonding portion may have an annular planar shape and have an outer diameter greater than that of the upper bobbin.

For example, the conductive bonding unit may include a film adhesive; And it may include conductive particles dispersed in the film adhesive.

For example, the upper bobbin may have the same outer shape as the core.

For example, the 1-1st conductive pattern includes a plurality of 1-1st conductive pattern segments spaced apart from each other in a circumferential direction, and the 2-1st conductive pattern includes a plurality of 1st conductive pattern segments spaced apart from each other in a circumferential direction. 2-1 conductive pattern segments, wherein each of the plurality of 1-1 conductive pattern segments includes a first end extending downward from an outer circumferential side of the upper bobbin, and a first end extending downward from an inner circumferential side of the upper bobbin. 2 ends, and each of the plurality of 2-1st conductive pattern segments may electrically connect a first end of one of the two adjacent 1-1st conductive pattern segments to a second end of the other one. .

In addition, the EMI filter according to the embodiment includes an inductor; and a capacitor, wherein the inductor includes a toroidal core; an upper bobbin surrounding an upper surface, an outer circumferential surface, and an inner circumferential surface of the core; and a lower bobbin disposed on a lower surface of the core, wherein a 1-1 conductive pattern and a 1-2 conductive pattern spaced apart from each other are disposed on an outer surface of the upper bobbin, and the lower bobbin is coupled to the upper bobbin. a 2-1 conductive pattern connected to the 1-1 conductive pattern to form a first winding and a 2-2 conductive pattern connected to the 1-2 conductive pattern to form a second winding are disposed on the upper surface. It can be.

For example, the EMI filter may further include a conductive bonding portion disposed between the lower surface of the core and the upper surface of the lower bobbin.

The inductor according to the embodiment and the EMI filter including the same have a three-dimensional thin film coil, so there are few restrictions on core design, and productivity is improved because a separate coil winding process is unnecessary.

1 shows a block diagram of a general power board to which an EMI filter is applied connected to a power source and a load.
2 shows a perspective view of a general inductor.
FIG. 3 is an exploded perspective view of a case where the magnetic core shown in FIG. 2 further includes a bobbin.
4 (a) and 4 (b) show a process perspective view of the magnetic core shown in FIG.
5 is an exploded perspective view of an inductor according to an embodiment of the present invention.
6 illustrates an example of a form in which windings are formed through coupling between conductive patterns according to an embodiment.
7A to 7C show an example of an external shape of an inductor according to an embodiment.
8 is a cross-sectional view of part 'A' of FIG. 7B cut to include one electrode extension in the radial direction of the upper bobbin, and FIG. 9 is an enlarged view of part 'B' of FIG. 8 before and after coupling of the upper bobbin and the lower bobbin. it is a cross section
FIG. 10A is a diagram for explaining an air core-type inductor structure according to another embodiment, and FIG. 10B is a diagram for explaining an example of a bar-shaped ferromagnetic core-type inductor structure according to another embodiment, respectively.
11A is an exploded perspective view of a transformer according to another embodiment, and FIG. 11B is a perspective view of a transformer according to another embodiment, respectively.
12 is an example of an EMI filter including an inductor according to an embodiment.

Since the present invention can make various changes and have various embodiments, specific embodiments are illustrated and described in the drawings. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

Terms including ordinal numbers such as second and first may be used to describe various components, but the components are not limited by the terms. These terms are only used for the purpose of distinguishing one component from another. For example, a second element may be termed a first element, and similarly, a first element may be termed a second element, without departing from the scope of the present invention. The terms and/or include any combination of a plurality of related recited items or any of a plurality of related recited items.

It is understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, but other elements may exist in the middle. It should be. On the other hand, when an element is referred to as “directly connected” or “directly connected” to another element, it should be understood that no other element exists in the middle.

In the description of the embodiments, each layer (film), region, pattern or structure is “on” or “under” the substrate, each layer (film), region, pad or pattern. The substrate formed on includes all those formed directly or through another layer. The criteria for upper/upper or lower/lower of each layer will be described based on drawings. In addition, since the thickness or size of each layer (film), region, pattern, or structure in the drawing may be modified for clarity and convenience of description, it does not entirely reflect the actual size.

Terms used in this 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 dictates otherwise. In this application, the terms "include" or "have" are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in the present application, they should not be interpreted in an ideal or excessively formal meaning. don't

Hereinafter, the embodiments will be described in detail with reference to the accompanying drawings, but the same or corresponding components regardless of reference numerals are given the same reference numerals, and overlapping descriptions thereof will be omitted.

According to one embodiment of the present invention, an inductor in which thin film pattern-shaped conductive wires are disposed on the surface of a bobbin surrounding at least a part of a core is proposed. When the core and the bobbin are coupled, the conductive wire having a thin film pattern becomes a shape wound around the core, and can perform the function of a coil. Accordingly, the inductor including the winding may be completed only by assembling the core and the bobbin without a separate winding process. This will be described with reference to FIG. 5 .

5 is an exploded perspective view of an inductor according to an embodiment of the present invention.

Referring to FIG. 5 , the inductor 200 according to the embodiment includes a toroidal core 210, an upper bobbin 220 covering an upper surface S1, an outer circumferential surface S2, and an inner circumferential surface S4 of the core 210. And, a lower bobbin 230 disposed below the lower surface S3 of the core 210, and an adhesive part 240 for bonding the upper bobbin 220 and the lower bobbin 230.

Hereinafter, each component will be described in more detail.

First, the core 210 may include ferrite. Here, the magnetic permeability (μ) of ferrite may be 2,000 to 15,000. For example, ferrite may be Mn-Zn ferrite.

The upper bobbin 220 may have a shape capable of covering the upper surface S1 , the outer circumferential surface S2 , and the inner circumferential surface S4 of the core 210 . For example, the upper bobbin 220 may have an outer shape corresponding to the core 210, that is, a toroidal shape with an open bottom. In this case, the upper bobbin 220 may have an upper surface, an outer circumferential surface, and an inner circumferential surface, and a cross section cut in the radial direction from the center of the hollow defined as the inner circumferential surface of the upper bobbin 220 may have a square pillar shape. Of course, this is an example and the embodiment is not limited thereto. For example, as long as the portion except for the bottom of the core 210 can be wrapped, the cross section of the upper bobbin 220 can have various shapes such as a polygonal columnar shape or an arcuate shape.

In addition, a conductive wire may be disposed on an outer surface of the upper bobbin 220 . The conductive wiring may be formed in a metal pattern. For example, the upper bobbin 220 may include a 1-1st conductive pattern 221 and a 1-2nd conductive pattern 223 that are spaced apart from each other and have a three-dimensional shape. Each of the conductive patterns 221 and 223 is disposed on the upper surface of the upper bobbin 220 in the radial direction, and is bent or curved at each boundary between the upper surface and the outer circumferential surface and between the upper surface and the inner circumferential surface, again in the lower direction (eg, -Z axis direction). ) may include a plurality of conductive pattern segments that extend. A plurality of conductive pattern segments may be spaced apart from each other in a circumferential direction.

The 1-1st conductive pattern 221 and the 1-2nd conductive pattern 223 may be formed through a laser direct structuring (LDS) processing method or 3D printing. The LDS processing method generally refers to a technique of making a conductor pattern on an injection-molded polymer resin, for example, plastic. In this method, in order to make a conductor pattern on the plastic surface, first, a heavy metal that can act as a plating catalyst is added to a polymer resin raw material to make a molded product, and a laser is irradiated on the surface of the molded product to create a pattern and at the same time expose the heavy metal that will act as a catalyst. A metal pattern is created by putting it in an electroless plating bath and plating it. That is, the catalyst contained in the resin may be activated using a laser so that only that portion is plated. In addition, the 3D printing method refers to a method of forming a three-dimensional conductive pattern using ink having conductivity instead of general polymer ink.

Therefore, when the conductive patterns 221 and 223 are formed by the LDS processing method, the upper bobbin 220 is preferably manufactured by an injection method including a resin-based material and a plating catalyst.

For example, each conductive pattern may include at least one of copper, silver, and nickel components, but this is illustrative and not necessarily limited thereto.

Next, the lower bobbin 230 is plate-shaped, and the planar shape of the lower bobbin 230 is the core 210 exposed to the lower portion of the upper bobbin 220 when the core 210 is coupled to the upper bobbin 220. ) It may have a shape suitable for wrapping the lower surface (S3). For example, the lower bobbin 230 may have a circular or annular flat shape, and the size of the flat surface of the lower bobbin 230 may be greater than or equal to the flat surface of the upper bobbin 220 .

In addition, a conductive wire may be disposed on an upper surface of the lower bobbin 230 . The conductive wiring may be formed in a metal pattern. For example, the lower bobbin 230 may include a 2-1st conductive pattern 231 and a 2-2nd conductive pattern 233 that are spaced apart from each other and have a planar shape. Each of the conductive patterns 231 and 233 may include a plurality of conductive pattern segments extending radially from the upper surface of the lower bobbin 220 . A plurality of conductive pattern segments may be spaced apart from each other in a circumferential direction. The 2-1st conductive pattern 231 and the 2-2nd conductive pattern 233 may also be formed by the above-described LDS method or 3D printing method.

When the upper bobbin 220 and the lower bobbin 230 are coupled, the 1-1st conductive pattern 221 and the 2-1st conductive pattern 231 integrally form a three-dimensional coil shape to form a first winding wire. can In addition, the 1-2nd conductive pattern 223 and the 2-2nd conductive pattern 232 may integrally form a 3D coil shape to form a second winding wire. The specific shape of the winding will be described later in more detail with reference to FIG. 6 .

Meanwhile, the bonding unit 240 may be disposed between the core 210 and the lower bobbin 230 to bond the upper bobbin 220 and the lower bobbin 230 to each other. The adhesive portion 240 may have a film shape and an annular or circular planar shape. Also, the adhesive portion 240 may be a conductive adhesive portion having conductivity. When the adhesive part has conductivity, when the upper bobbin 220 and the lower bobbin 230 are coupled, between the 1-1st conductive pattern 221 and the 2-1st conductive pattern 231, and the 1-2nd conductive pattern The pattern 223 and the 2-2nd conductive pattern 232 may be electrically connected to each other. For example, the conductive adhesive portion 240 may be an anisotropic conductive film (ACF). The structure and function of the conductive bonding unit 240 will be described later in detail with reference to FIG. 9 .

Hereinafter, the formation principle of the winding will be described with reference to FIG. 6 .

6 illustrates an example of a form in which windings are formed through coupling between conductive patterns according to an embodiment. For ease of understanding, in FIG. 6 , only the 1-2nd conductive pattern 223 and 2-2nd conductive pattern 233 and the core 210 integrally forming the second winding are shown, and the upper bobbin 220, Illustration of the lower bobbin 230, the 1-1st conductive pattern 221 and the 2-1st conductive pattern 231 is omitted. In addition, in FIG. 6, it is assumed that the second winding formed of the 1-2nd conductive pattern 223 and the 2-2nd conductive pattern 233 has 6 turns, but this is for easy understanding and the number of turns is more or less than this. Of course, the second winding can be formed as.

Referring to FIG. 6 , the 1-2nd conductive pattern 223 includes six conductive patterns such as a 1-2-2 conductive pattern segment 223-2 and a 1-2-3 conductive pattern segment 223-3. contains segments. Each conductive pattern segment has a first end extending downward from the outer circumferential side of the upper bobbin (not shown) or core 210, and a second end extending downward from the inner circumferential side of the upper bobbin (not shown) or core 210. includes the end For example, the 1-2-2 conductive pattern segment 223-2 includes a 1-1 end portion 223-21 and a 2-1 end portion 223-22, and the 1-2-3 conductive pattern segment 223-2 includes The segment 223-3 includes a first-second end portion 223-31 and a second-first end portion 223-32.

In addition, the 2-2nd conductive pattern 233 includes electrode extensions 233-1 and 233-7 extending to electrode pads to be described later at both ends, and the 2-2-3rd conductive pattern segment 233-3. and five 2-2 conductive pattern segments.

Each of the 2-2 conductive pattern segments electrically connects a first end of one of two adjacent 1-2 conductive pattern segments to a second end of the other one. For example, the 2-2-3 conductive pattern segment 233-3 includes the 1-1 end 223-21 of the 1-2-2 conductive pattern segment 223-2, and the 1-2 -3 Electrically connects the 2-1st end 223-32 of the conductive pattern segment 223-3. To this end, both ends of each of the 2-2 conductive pattern segments are preferably disposed so as to partially overlap the first and second ends electrically connected therethrough in a vertical direction (eg, Z-axis direction). do.

Since the first winding integrally formed by the 1-1st conductive pattern 221 and the 2-1st conductive pattern 231 is the same as the aforementioned method of forming the second winding, overlapping descriptions will be omitted.

Hereinafter, referring to FIG. 7 , an inductor shape in which components shown in FIG. 5 are coupled will be described. 7A to 7C show an example of an external shape of an inductor according to an embodiment.

Referring to FIG. 7A , a plan view of an inductor 200 according to an embodiment is shown. In FIG. 7A , the 1-1st conductive pattern 221 and the 1-2nd conductive pattern 223 are shown to be disposed in opposite directions with respect to the hollow of the upper bobbin 220, but the arrangement relationship between the respective conductive patterns is not necessarily limited thereto. In addition, in FIG. 7A, the case where the plane area of the lower bobbin 230 is larger than the plane area of the upper bobbin 220 is illustrated.

7B is a perspective view of an inductor 200 according to an embodiment. Referring to FIG. 7B , the electrode extension parts 233-1 and 233-7 extend from the top surface of the lower bobbin 230 to the side surface of the lower bobbin 230, and from the side surface to the bottom surface of the lower bobbin 230, respectively. is extended

7C is a bottom view of an inductor 200 according to an embodiment. Referring to FIG. 7C , electrode extensions 233-1 and 233-7 extending from the side surface of the lower bobbin 230 back to the bottom surface of the lower bobbin 230 may be connected to the electrode pad 235. The electrode pad is to enable the inductor 200 to be mounted on a board through a connection means such as soldering.

Hereinafter, with reference to FIGS. 8 and 9 , an electrical connection method for coupling an upper bobbin and a lower bobbin through a conductive bonding portion and forming windings will be described.

8 is a cross-sectional view of part 'A' of FIG. 7B cut to include one electrode extension in the radial direction of the upper bobbin, and FIG. 9 is an enlarged view of part 'B' of FIG. 8 before and after coupling of the upper bobbin and the lower bobbin. it is a cross section

Referring to FIG. 8 , among the 1-2nd conductive patterns 223, the 1-2-6th conductive pattern segments 223-6 located at the edge in the circumferential direction are perpendicular to the electrode extension part 233-7. At least some overlap. At this time, the conductive adhesive part 240 is disposed between the 1-2-6 conductive pattern segment 223-6 and the electrode extension part 233-7, so that the 1-2-6 conductive pattern segment 223-6 and the electrode extension part 233-7 may be electrically connected. In addition, since the conductive bonding part 240 is also disposed between the bottom surface of the upper bobbin 220 and the top surface of the lower bobbin 230, the upper bobbin 220 and the lower bobbin 230 can be bonded by the conductive bonding part 240. there is.

The left side of FIG. 9 shows part 'B' of FIG. 8 before the upper bobbin 220 and the lower bobbin 230 are coupled, and the right side of FIG. 9 shows the upper bobbin 220 and the lower bobbin 230 in the vertical direction. Each part 'B' of FIG. 8 in a pressed and coupled state is shown. Referring first to the left side of FIG. 9 , the conductive adhesive part 240 includes a film-shaped adhesive 242 and a plurality of conductive particles 241 dispersed in the adhesive 242 . The conductive particles 241 may be coated or plated with a conductive material (eg, metal) on plastic or metal powder. Before being pressed in the vertical direction, the conductive bonding portion 240 does not have conductivity because the conductive particle 241 does not form an electrically closed path with an external conductor. However, as shown on the right side of FIG. 9 , when the conductive adhesive part 240 is pressed in the vertical direction while the upper bobbin 220 and the lower bobbin 230 are coupled, the 1-2-6 conductive pattern segments 223-6 and The conductive particles 241 positioned between the electrode extensions 233-7 electrically connect the 1-2-6 conductive pattern segments 223-6 and the electrode extensions 233-7. That is, between the 1-2-6th conductive pattern segment 223-6 and the electrode extension part 233-7, a vertically closed electrical path is formed only in the portion where the conductive particle 241 exists.

At this time, since the conductive particles not located between the 1-2-6 conductive pattern segment 223-6 and the electrode extension 233-7 still do not form any electrical path, the 1-2-6 conductive pattern The segment 223-6 and the electrode extension 233-7 may remain insulated from adjacent conductive pattern segments or electrode extensions other than each other. Accordingly, one winding can be formed without a short circuit through the introduction of the conductive bonding portion 240 .

Meanwhile, in order to ensure an electrical connection between the conductive pattern disposed on the upper bobbin 220 and the conductive pattern disposed on the lower bobbin 230, the outer diameter of the conductive bonding portion 240 on a plane is at least equal to or greater than the outer diameter of the upper bobbin. It is preferably larger, and each end of the conductive pattern disposed on the upper bobbin 220 may extend or protrude further downward from the bottom surface of the upper bobbin 220 in a vertical direction (eg, in the -Z-axis direction).

Although the inductor according to the above-described embodiment assumes a toroidal-shaped core, this is an example, and it is obvious to those skilled in the art that the embodiment is not limited thereto and can be applied to cores of various shapes. For example, in the case of a hollow core formed by forming a loop, the first bobbin has a shape surrounding a portion except for one side of the core so as to accommodate the core, and the second bobbin has a shape surrounding the other side, As long as the conductive pattern on the bobbin 1 side is disposed on the outer surface of the first bobbin and the conductive pattern on the second bobbin side is disposed on the surface of the second bobbin facing the core, this embodiment can be applied to any shape of core. As another example, in the case of a straight or curved core, a method of extending in the same direction as the extending direction of the core, inserting the core into a bobbin having a tube shape, and disposing a spiral conductive pattern on the outer surface of the tube shape. Inductors can also be fabricated. Hereinafter, inductors having various shapes according to embodiments will be described with reference to FIGS. 10A and 11B .

FIG. 10A is a diagram for explaining an air core-type inductor structure according to another embodiment, and FIG. 10B is a diagram for explaining an example of a bar-shaped ferromagnetic core-type inductor structure according to another embodiment, respectively.

First, referring to FIG. 10A , an inductor 300A according to another embodiment includes a bobbin 320 having a square ring shape in cross section and a conductive pattern 321 spirally disposed on the outer surface of the bobbin 320 to form a winding. includes The bobbin 320 may have a through hole TH penetrating the bobbin 320 in a longitudinal direction (eg, a y-axis direction). Electrode pads 322 may be disposed on both ends of the conductive pattern 321 . As described above, the bobbin 320 may be manufactured by an injection method, and the conductive pattern 321 may be formed by an LDS method or 3D printing.

Next, the inductor 300B shown in FIG. 10B has a similar structure to the inductor 300A shown in FIG. 10A except for the core 310 inserted in the through hole TH of the bobbin 320 in the longitudinal direction. do. Here, the core 310 may be a ferromagnetic material containing iron or ferrite.

Meanwhile, according to another embodiment, a transformer including a three-dimensional conductive pattern is provided. This will be described with reference to FIGS. 11A and 11B.

11A is an exploded perspective view of a transformer according to another embodiment, and FIG. 11B is a perspective view of a transformer according to another embodiment, respectively.

Referring to FIGS. 11A and 11B together, a transformer 400 according to another embodiment viewed from the top side is shown. The transformer 400 according to another embodiment includes a core 410 having a square ring-shaped planar shape, an upper bobbin 420 surrounding the inner, outer and upper surfaces of the core 410, and the bottom surface of the core 410. It includes a lower bobbin 430 that wraps around.

The upper bobbin 420 may have a shape capable of covering the top, outer and inner surfaces of the core 410 . For example, the outer shape of the upper bobbin 420 may have an outer shape corresponding to that of the core 410, that is, a square ring shape with an open bottom. In this case, the upper bobbin 420 may have an upper surface, four outer surfaces, and four inner surfaces. Of course, this is an example and the embodiment is not limited thereto. For example, the upper bobbin 420 may have various shapes as long as it can cover a portion of the core 410 except for the bottom surface.

In addition, a conductive wire may be disposed on an outer surface of the upper bobbin 420 . The conductive wiring may be formed in a metal pattern. For example, the upper bobbin 420 may include a 1-1st conductive pattern 421 and a 1-2nd conductive pattern 422 that are spaced apart from each other and have a three-dimensional shape. The conductive patterns 421 and 422 may be spaced apart from each other at positions corresponding to opposite sides of the rectangular ring on a plane.

Next, the lower bobbin 430 is plate-shaped, and the planar shape of the lower bobbin 430 is the core 410 exposed to the lower portion of the upper bobbin 420 when the core 410 is coupled to the upper bobbin 420. ) may have a shape suitable for wrapping the lower surface. For example, the lower bobbin 430 may have a square or square ring flat shape, and the size of the flat surface of the lower bobbin 430 may be greater than or equal to that of the upper bobbin 420 .

In addition, a conductive wire may be disposed on an upper surface of the lower bobbin 430 . The conductive wiring may be formed in a metal pattern. For example, the lower bobbin 430 may include a 2-1st conductive pattern 431 and a 2-2nd conductive pattern 432 that are spaced apart from each other and have a planar shape.

When the upper bobbin 420 and the lower bobbin 430 are combined, the 1-1st conductive pattern 421 and the 2-1st conductive pattern 431 integrally form a three-dimensional coil shape to form the primary coil of the transformer. can form In addition, the 1-2nd conductive pattern 422 and the 2-2nd conductive pattern 432 may integrally form a three-dimensional coil shape to form a secondary coil of the transformer. Since the shape of the specific coil is similar to that described above with reference to FIG. 6, redundant description will be omitted.

Although not shown, the transformer 400 according to another embodiment may further include a conductive bonding portion disposed between the core 410 and the lower bobbin 430 to bond the upper bobbin 420 and the lower bobbin 430. can The conductive adhesive portion (not shown) may be an anisotropic conductive film (ACF). The coupling between bobbins and the electrical connection between conductive patterns through the conductive bonding portion are similar to those described above with reference to FIG. 9 , and therefore, duplicate descriptions will be omitted.

Each of the bobbins 420 and 430 of the transformer 400 according to another embodiment may also be manufactured by an injection method, and each of the conductive patterns 421, 422, 431 and 432 may be formed by an LDS method or a 3D printing method. Of course there is.

Also, as shown in FIG. 11A , the electrode pad 425 may be formed on the upper surface of the upper bobbin 420 . Of course, as shown in FIG. 7C , the electrode pad 425 may be disposed on the lower surface of the lower bobbin 430 .

In the inductors and transformers according to the embodiments of the present invention described so far, since the three-dimensional conductive pattern disposed on the surface of the bobbin serves as a coil (winding), a separate winding operation is unnecessary and the assembly process is simple. In addition, since the three-dimensional conductive pattern can be freely formed on the bobbin, it can correspond to cores of various shapes, and coil arrangement is also free. In addition, since the winding is in the form of a thin film, there is an advantage in that the inductor can be miniaturized.

Meanwhile, the inductor according to the above-described embodiment may be included in the line filter. For example, the line filter may be a line filter for noise reduction applied to an AC-to-DC converter. 12 is an example of an EMI filter including an inductor according to an embodiment.

Referring to FIG. 12 , the EMI filter 2000 may include a plurality of X-capacitors (Cx), a plurality of Y-capacitors (Cy), and an inductor (L).

The X-capacitor (Cx) is between the first terminal (P1) of the live line (LIVE) and the third terminal (P3) of the neutral line (NEUTRAL), and between the second terminal (P2) of the live line (LIVE) and the neutral line ( NEUTRAL) are respectively disposed between the fourth terminals P4.

A plurality of Y-capacitors Cy may be disposed in series between the second terminal P2 of the live line LIVE and the fourth terminal P4 of the neutral line NEUTRAL.

The inductor L may be disposed between the first terminal P1 and the second terminal P2 of the live line LIVE and between the third terminal P3 and the fourth terminal P4 of the neutral line NEUTRAL. there is. Here, the inductor L may be the inductor 100 according to the above-described embodiment.

When common mode noise is introduced into the EMI filter 2000, the common mode noise is removed by the combined impedance characteristics of the primary inductance and the Y-capacitor Cy. Here, the primary-side inductance of the live line (LIVE) may be obtained by measuring the inductance between the first and second terminals P1 and P2 while the third and fourth terminals P3 and P4 are open. The primary side inductance of the neutral line NEUTRAL is obtained by measuring the inductance between the third and fourth terminals P3 and P4 while the first and second terminals P1 and P2 are open. It can be.

When differential mode noise is introduced into the EMI filter 2000, the differential mode noise is removed by a combined impedance characteristic of a leakage inductance and an X-capacitor Cx. Here, the leakage inductance of the live line (LIVE) may be obtained by measuring the inductance between the first and second terminals P1 and P2 in a state in which the third and fourth terminals P3 and P4 are shorted. The leakage inductance of the neutral line NEUTRAL may be obtained by measuring the inductance between the third and fourth terminals P3 and P4 in a state in which the first and second terminals P1 and P2 are shorted.

The inductor of the EMI filter 2000 according to the embodiment corresponds to the inductor according to the above-described embodiments.

The description of each of the foregoing embodiments may be applied to other embodiments as long as the content does not conflict with each other.

Although the above has been described with reference to the embodiments, these are merely examples and do not limit the present invention, and those skilled in the art to which the present invention belongs will not deviate from the essential characteristics of the present embodiment. It will be appreciated that various variations and applications are possible. For example, each component specifically shown in the embodiment can be modified and implemented. And the differences related to these modifications and applications should be construed as being included in the scope of the present invention as defined in the appended claims.

100, 200, 300A, 300B, 400: inductor
110, 210: magnetic core
120: coil
220: upper bobbin
230: lower bobbin
240: conductive adhesive part

Claims (10)

a toroidal-shaped core;
an upper bobbin surrounding an upper surface, an outer circumferential surface, and an inner circumferential surface of the core; and
Including a lower bobbin disposed on the lower surface of the core,
A 1-1st conductive pattern and a 1-2nd conductive pattern spaced apart from each other are disposed on the outer surface of the upper bobbin,
When the lower bobbin is combined with the upper bobbin, the 2-1 conductive pattern connected to the 1-1 conductive pattern to form a first winding and the 1-2 conductive pattern to form a second winding A 2-2 conductive pattern is disposed on the upper surface;
The upper bobbin includes an upper surface, an outer circumferential surface, and an inner circumferential surface respectively corresponding to the upper surface, the outer circumferential surface, and the inner circumferential surface of the core,
Each of the 1-1st conductive pattern and the 1-2nd conductive pattern
a first portion disposed on the upper surface of the upper bobbin;
a second part disposed on the outer circumferential surface of the upper bobbin; and
A third portion disposed on the inner circumferential surface of the upper bobbin;
The first to third portions are integrally patterned, the inductor. According to claim 1,
The inductor further comprises a conductive bonding portion disposed between the lower surface of the core and the upper surface of the lower bobbin. According to claim 2,
Wherein the 1-1st conductive pattern and the 2-1st conductive pattern, and the 1-2nd conductive pattern and the 2-2nd conductive pattern are electrically connected to each other through the conductive bonding portion. According to claim 2,
The upper bobbin and the lower bobbin are coupled through the conductive bonding portion. According to claim 2,
The conductive adhesive part,
It has an annular planar shape,
An inductor having an outer diameter larger than the outer diameter of the upper bobbin. According to claim 2,
The conductive adhesive part,
film adhesive; and
An inductor comprising conductive particles dispersed in the film adhesive. According to claim 1,
The upper bobbin,
An inductor having the same external shape as the core. According to claim 7,
The 1-1 conductive pattern includes a plurality of 1-1 conductive pattern segments spaced apart from each other in a circumferential direction;
The 2-1st conductive pattern includes a plurality of 2-1st conductive pattern segments spaced apart from each other in a circumferential direction,
Each of the plurality of 1-1 conductive pattern segments includes a first end extending downward from an outer circumferential surface of the upper bobbin and a second end extending downward from an inner circumferential surface of the upper bobbin,
Wherein each of the plurality of 2-1st conductive pattern segments electrically connects a first end of one of the two adjacent 1-1st conductive pattern segments to a second end of the other one. inductor; and
contains a capacitor,
The inductor is
a toroidal-shaped core;
an upper bobbin surrounding an upper surface, an outer circumferential surface, and an inner circumferential surface of the core; and
Including; lower bobbin disposed on the lower surface of the core,
A 1-1st conductive pattern and a 1-2nd conductive pattern spaced apart from each other are disposed on the outer surface of the upper bobbin,
When the lower bobbin is combined with the upper bobbin, the 2-1 conductive pattern connected to the 1-1 conductive pattern to form a first winding and the 1-2 conductive pattern to form a second winding A 2-2 conductive pattern is disposed on the upper surface;
The upper bobbin includes an upper surface, an outer circumferential surface, and an inner circumferential surface respectively corresponding to the upper surface, the outer circumferential surface, and the inner circumferential surface of the core,
Each of the 1-1st conductive pattern and the 1-2nd conductive pattern
a first portion disposed on the upper surface of the upper bobbin;
a second part disposed on the outer circumferential surface of the upper bobbin; and
A third portion disposed on the inner circumferential surface of the upper bobbin;
The first to third portions are integrally patterned, the EMI filter. According to claim 9,
The EMI filter further comprises a conductive bonding portion disposed between the lower surface of the core and the upper surface of the lower bobbin.

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