Coil electronic component

Abstract

There is provided a coil electronic component including: a first coil including at least one turn of a first conductive wire; the second coil comprises at least one turn of second conductive wire; an intermediate layer disposed between the first coil and the second coil and having a first magnetic permeability; and a magnetic body surrounding the first coil, the second coil, and the intermediate layer, and having a second magnetic permeability different from the first magnetic permeability. A cross-sectional area of the first conductive line is different from a cross-sectional area of the second conductive line.

Description

Technical Field

[0001] The present disclosure relates to a coil electronic assembly. Background Art

[0002] Recently, as functions of mobile devices have diversified, power consumption has increased, and coil electronic components with low loss and high efficiency have been adopted around a power management integrated circuit (PMIC) to increase battery life in the mobile devices.

[0003] When a coil electronic component has a coupled inductor structure in which a primary coil and a secondary coil are stacked vertically, a difference in direct current (DC) resistance Rdc may occur if the lengths of the primary coil and the secondary coil are different. The difference in DC resistance Rdc results in a difference in voltage across the coil and a difference in magnetic flux density. As a result, a difference in inductance between the primary coil and the secondary coil also occurs. Therefore, a method for reducing the DC resistance difference between coils in a coupled inductor structure is needed. Summary of the invention

[0004] The present disclosure seeks to provide a coil electronics assembly capable of reducing the DC resistance difference between coils in a coupled inductor structure.

[0005] However, the embodiments of the present disclosure are not limited to the coil electronic components that achieve the above-mentioned technical effects, and can be variously extended within the scope of the technical ideas included in the present disclosure.

[0006] The coil electronic component according to the embodiment may include: a first coil including at least one turn of a first conductive wire; a second coil including at least one turn of a second conductive wire; an intermediate layer disposed between the first coil and the second coil and having a first magnetic permeability; and a magnetic body surrounding the first coil, the second coil and the intermediate layer and having a second magnetic permeability different from the first magnetic permeability. The cross-sectional area of ​​the first conductive wire and the cross-sectional area of ​​the second conductive wire may be different.

[0007] In addition, the length of the first conductive line may be greater than the length of the second conductive line.

[0008] In addition, the cross-sectional area of ​​the first conductive line may be greater than the cross-sectional area of ​​the second conductive line.

[0009] In addition, an average value of a difference between the length of the first conductive line and the length of the second conductive line may be approximately 0.2 mm, and an average value of a ratio of a cross-sectional area of ​​the first conductive line to a cross-sectional area of ​​the second conductive line may be approximately 122% or more and approximately 150% or less.

[0010] In addition, the average cross-sectional area of ​​the first conductive wire may be about 0.0075 mm 2or larger and about 0.024mm 2 or less, and the average value of the cross-sectional area of ​​the second conductive wire may be about 0.005 mm 2 or larger and about 0.0184mm 2 or smaller.

[0011] In addition, an average value of a difference between a DC resistance of the first conductive line and a DC resistance of the second conductive line may be about 0.125 mohm or more and about 0.651 mohm or less.

[0012] In addition, an average value of a difference between the length of the first conductive line and the length of the second conductive line may be approximately 0.5 mm, and an average value of a ratio of a cross-sectional area of ​​the first conductive line to a cross-sectional area of ​​the second conductive line may be approximately 172% or more and approximately 180% or less.

[0013] In addition, the average cross-sectional area of ​​the first conductive wire may be about 0.009 mm 2 or larger and about 0.0322mm 2 or less, and the average value of the cross-sectional area of ​​the second conductive wire may be about 0.005 mm 2 or larger and about 0.0184mm 2 or smaller.

[0014] In addition, an average value of a difference between a DC resistance of the first conductive line and a DC resistance of the second conductive line may be about 0.212 mohm or more and about 0.432 mohm or less.

[0015] In addition, the cross-sectional shape of the first conductive wire may be circular or elliptical, and the cross-sectional shape of the second conductive wire may be circular or elliptical.

[0016] In addition, the cross section of the first conductive wire may have a rectangular shape with rounded sides, and the cross section of the second conductive wire may have a rectangular shape with rounded sides. The average length of the major axis passing through the center of the cross section of the first conductive wire may be greater than the average length of the major axis passing through the center of the cross section of the second conductive wire, and the average length of the minor axis intersecting the major axis at the center of the cross section of the first conductive wire may be equal to the average length of the minor axis intersecting the major axis at the center of the cross section of the second conductive wire.

[0017] In addition, the cross section of the first conductive wire may have a rectangular shape with rounded sides, and the cross section of the second conductive wire may have a rectangular shape with rounded sides. The average length of the major axis passing through the center of the cross section of the first conductive wire may be equal to the average length of the major axis passing through the center of the cross section of the second conductive wire, and the average length of the minor axis intersecting the major axis at the center of the cross section of the first conductive wire may be greater than the average length of the minor axis intersecting the major axis at the center of the cross section of the second conductive wire.

[0018] In addition, the intermediate layer may be in contact with the first coil and the second coil.

[0019] The intermediate layer may extend from a first region between a first core of the first coil and a second core of the second coil to a second region between the first coil and the second coil.

[0020] In addition, the intermediate layer may be in contact with the outer surface of the magnetic body.

[0021] In addition, a thickness of the intermediate layer located in the first region may be equal to a thickness of the intermediate layer located in the second region.

[0022] Additionally, the intermediate layer may extend from the first region to a portion of the first core.

[0023] Additionally, the intermediate layer may extend from the first region to a portion of the second core.

[0024] The intermediate layer may extend from the first region to a portion of the first core, and the intermediate layer may extend from the first region to a portion of the second core.

[0025] The coil electronic component may also include: a first external electrode, which is arranged on the outside of the magnetic body and connected to the first lead portion of the first coil; a second external electrode, which is arranged on the outside of the magnetic body and connected to the second lead portion of the first coil; a third external electrode, which is arranged on the outside of the magnetic body and connected to the first lead portion of the second coil; and a fourth external electrode, which is arranged on the outside of the magnetic body and connected to the second lead portion of the second coil.

[0026] According to the coil electronic component according to the embodiment, a DC resistance difference between coils due to the difference in length of the primary coil and the secondary coil can be reduced by making the cross-sectional areas of the primary coil and the secondary coil in the coupled inductor structure different. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a perspective view schematically showing a coil electronic component according to an embodiment.

[0028] Figure 2 It is schematically shown Figure 1 A top plan view of the coil electronics assembly.

[0029] Figure 3 It is schematically shown Figure 1 Bottom perspective view of the coil electronics assembly.

[0030] Figure 4 It is along Figure 1 Schematic cross-sectional view taken along line IV-IV'.

[0031] Figure 5 is a bottom perspective view schematically showing a coil electronic component according to another embodiment.

[0032] Figure 6 is a bottom perspective view schematically showing a coil electronic component according to another embodiment.

[0033] Figure 7 Schematically shows a coil electronic component according to another embodiment Figure 4 The corresponding cross-sectional view. DETAILED DESCRIPTION

[0034] Hereinafter, the present disclosure will be described in detail with reference to the accompanying drawings, in which embodiments of the present disclosure are shown. The accompanying drawings and descriptions are to be considered as illustrative and non-restrictive in nature. Throughout the specification, the same reference numerals represent the same elements. In the accompanying drawings, some constituent elements are enlarged, omitted or briefly shown, and the size of each constituent element does not fully reflect the actual size.

[0035] The drawings are only intended to facilitate understanding of the exemplary embodiments disclosed in this specification, and it will be understood that the technical ideas disclosed herein are not limited to the drawings, and include all modifications, equivalents, and replacements within the scope of the ideas and technologies of the present disclosure.

[0036] Although the terms "first", "second", etc. are used to explain various constituent elements, the constituent elements are not limited to such terms. These terms are only used to distinguish one constituent element from another constituent element.

[0037] Additionally, it will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" another element, it can be directly on the other element, or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements. Furthermore, when an element is referred to as being "on" or "above" a reference element, it can be located above or below the reference element, and is not necessarily referred to as being "on" or "above" in a direction opposite to gravity.

[0038] Throughout the specification, the terms "include" or "have" are intended to specify the presence of stated features, integers, steps, operations, constituent elements, components, or combinations thereof, but do not exclude the presence or addition of one or more other features, integers, steps, operations, constituent elements, components, and / or combinations thereof. Therefore, unless explicitly described to the contrary, the word "include" and variations such as "comprises" or "have" will be understood to imply the inclusion of the stated elements without excluding any other elements.

[0039] Furthermore, throughout the specification, the phrase "in a plan view" or "on a plane" means observing a target portion from above, and the phrase "in a cross-sectional view" or "on a cross section" means observing a cross section formed by vertically cutting the target portion from a side.

[0040] Throughout the specification, the term "connected" not only means that two or more constituent components are directly connected but also may mean that two or more constituent components are indirectly connected through another constituent component, that two or more constituent components are electrically connected as well as physically connected, or that two or more constituent components are represented by different names but are united by position or function.

[0041] As used herein, the term "about" means approximately. Typically, the term "about" is used herein to modify a numerical value by a variation of 10% above or below a specified value. In one aspect, the term "about" means within a range of ±20% of the numerical value of the number with which it is used.

[0042] Figure 1 is a perspective view schematically showing a coil electronic component according to an embodiment of the present disclosure. Figure 2 It is schematically shown Figure 1 A top plan view of the coil electronics assembly. Figure 3 It is schematically shown Figure 1 Bottom perspective view of the coil electronics assembly. Figure 4 It is along Figure 1 Schematic cross-sectional view taken along line IV-IV'.

[0043] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 , the coil electronic component 1000 according to the embodiment includes a magnetic body 100 , a first coil 200 , a second coil 300 , an intermediate layer 400 , a first external electrode 500 , a second external electrode 600 , a third external electrode 700 , and a fourth external electrode 800 .

[0044] The magnetic body 100 may be provided in a substantially straight parallelepiped shape, but the present embodiment is not limited thereto. Due to the shrinkage of the magnetic powder, etc. during sintering, the magnetic body 100 may have a substantially straight parallelepiped shape, but not a perfect straight parallelepiped shape. For example, the magnetic body 100 may have a substantially straight parallelepiped shape, but the portion corresponding to the corner or vertex may have a rounded shape.

[0045] In this embodiment, for the convenience of description, the two surfaces facing the length direction (L-axis direction) are defined as the first surface S1 and the second surface S2, respectively. The two surfaces facing the width direction (W-axis direction) are defined as the third surface S3 and the fourth surface S4, respectively. The two surfaces facing the thickness direction (T-axis direction) are defined as the fifth surface S5 and the sixth surface S6, respectively.

[0046] The length of the coil electronic component 1000 may be represented by: based on an optical microscope or scanning electron microscope (SEM) photograph of a length direction (L axis direction)-thickness direction (T axis direction) cross section at the central portion of the width direction (W axis direction) of the coil electronic component 1000, the maximum value of the lengths of a plurality of line segments each connecting the two outermost boundary lines of the coil electronic component 1000 shown in the above cross-sectional photograph that are opposite in the length direction (L axis direction) and parallel to the length direction (L axis direction). Alternatively, the length of the coil electronic component 1000 may be represented by the minimum value of the lengths of a plurality of line segments each connecting the two outermost boundary lines of the coil electronic component 1000 shown in the above cross-sectional photograph that are opposite in the length direction (L axis direction) and parallel to the length direction (L axis direction). Optionally, the length of the coil electronic component 1000 may represent the arithmetic mean of the lengths of at least two of the multiple line segments that are each connected to the two outermost boundary lines of the coil electronic component 1000 shown in the above-mentioned cross-sectional photograph that are opposite in the length direction (L-axis direction) and are parallel to the length direction (L-axis direction).

[0047] The thickness of the coil electronic component 1000 may be represented by: based on an optical microscope or SEM photograph of a length direction (L axis direction)-thickness direction (T axis direction) cross section at the central portion of the width direction (W axis direction) of the coil electronic component 1000, the maximum value of the lengths of a plurality of line segments each connecting the two outermost boundary lines of the coil electronic component 1000 shown in the above cross-sectional photograph that are opposite in the thickness direction (T axis direction) and parallel to the thickness direction (T axis direction). Alternatively, the thickness of the coil electronic component 1000 may be represented by the minimum value of the lengths of a plurality of line segments each connecting the two outermost boundary lines of the coil electronic component 1000 shown in the above cross-sectional photograph that are opposite in the thickness direction (T axis direction) and parallel to the thickness direction (T axis direction). Optionally, the thickness of the coil electronic component 1000 may represent the arithmetic mean of the lengths of at least two of the multiple line segments each connecting the two outermost boundary lines of the coil electronic component 1000 shown in the above-mentioned cross-sectional photograph that are opposite in the thickness direction (T-axis direction) and parallel to the thickness direction (T-axis direction).

[0048] The width of the coil electronic component 1000 may be represented by: based on an optical microscope or SEM photograph of a length direction (L axis direction)-width direction (W axis direction) cross section at the central portion of the coil electronic component 1000 in the thickness direction (T axis direction), the maximum value of the lengths of a plurality of line segments each connecting the two outermost boundary lines of the coil electronic component 1000 shown in the above cross-sectional photograph that are opposite in the width direction (W axis direction) and parallel to the width direction (W axis direction). Alternatively, the width of the coil electronic component 1000 may be represented by the minimum value of the lengths of a plurality of line segments each connecting the two outermost boundary lines of the coil electronic component 1000 shown in the above cross-sectional photograph that are opposite in the width direction (W axis direction) and parallel to the width direction (W axis direction). Optionally, the width of the coil electronic component 1000 may represent the arithmetic mean of the lengths of at least two of the multiple line segments each connecting the two outermost boundary lines of the coil electronic component 1000 shown in the above-mentioned cross-sectional photograph that are opposite in the width direction (W-axis direction) and parallel to the width direction (W-axis direction).

[0049] In addition, each of the length, width and thickness of the coil electronic component 1000 can be measured using a micrometer measurement method. The micrometer measurement method can be measured in the following manner: zeroing the metrological R&R (repeatability and reproducibility) micrometer, inserting the coil electronic component 1000 according to the embodiment between the tips of the micrometer and rotating the measuring rod of the micrometer. In addition, when the length of the coil electronic component 1000 is measured by the micrometer measurement method, the length of the coil electronic component 1000 can represent a value measured once or represent the arithmetic mean of the values ​​measured multiple times. This method can be equally applied to measuring the width and thickness of the coil electronic component 1000.

[0050] The magnetic body 100 constitutes the outside of the coil electronic component 1000 and is a space for a magnetic circuit, which is a path through which the magnetic flux induced in the first coil 200 and the magnetic flux induced in the second coil 300 pass when current is applied to the first coil 200 via the first external electrode 500 and the second external electrode 600 and current is applied to the second coil 300 via the third external electrode 700 and the fourth external electrode 800.

[0051] The magnetic body 100 surrounds and encapsulates the first coil 200, the second coil 300, and the intermediate layer 400, and includes a magnetic material. The magnetic body 100 includes magnetic particles and an insulating material interposed between the magnetic particles.

[0052] The magnetic particles may include first magnetic metal particles, second magnetic metal particles having a larger particle size than the first magnetic metal particles, and third magnetic metal particles having a larger particle size than the second magnetic metal particles. 50 The average particle size D of the second magnetic metal particles may be about 0.1 μm or more and about 0.2 μm or less. 50 The average particle size D of the third magnetic metal particles may be about 1 μm or more and about 2 μm or less. 50 It may be about 25 μm or more and about 30 μm or less.

[0053] The magnetic particles may include ferrite particles or metal magnetic particles exhibiting magnetic properties.

[0054] The ferrite particles may include, for example, at least one of spinel ferrites (such as Mg-Zn-based ferrites, Mn-Zn-based ferrites, Mn-Mg-based ferrites, Cu-Zn-based ferrites, Mg-Mn-Sr-based ferrites, Ni-Zn-based ferrites, etc.), hexagonal ferrites (such as Ba-Zn-based ferrites, Ba-Mg-based ferrites, Ba-Ni-based ferrites, Ba-Co-based ferrites, Ba-Ni-Co-based ferrites, etc.), garnet-type ferrites (such as Y-based ferrites, etc.) and Li-based ferrites.

[0055] The metal magnetic particles may include two or more types of particles having different compositions, and may include one or more selected from the group consisting of iron (Fe), silicon (Si), chromium (Cr), cobalt (Co), molybdenum (Mo), aluminum (Al), niobium (Nb), copper (Cu), and nickel (Ni). For example, the metal magnetic particles may include at least one of pure iron, Fe-Si-based alloys, Fe-Si-Al-based alloys, Fe-Ni-based alloys, Fe-Ni-Mo-based alloys, Fe-Ni-Mo-Cu-based alloys, Fe-Co-based alloys, Fe-Ni-Co-based alloys, Fe-Cr-based alloys, Fe-Cr-Si-based alloys, Fe-Si-Cu-Nb-based alloys, Fe-Ni-Cr-based alloys, and Fe-Cr-Al-based alloys. Here, different compositions of the metal magnetic particles may also mean different contents.

[0056] The metal magnetic particles may be amorphous or crystalline. For example, the metal magnetic particles may include a Fe-Si-B-Cr based amorphous alloy, but the present embodiment is not limited thereto. The metal magnetic particles may have an average particle size of about 0.1 μm to about 30 μm, but is not limited thereto. In this specification, the average particle size may be referred to as D 90 or D 50 The particle size distribution is known to those skilled in the art as an indicator of the proportion of particles of a certain size (particle diameter) contained in a particle group to be measured.

[0057] D 90 and D 50 These refer to the particle sizes corresponding to 90% and 50% of the cumulative volume of the particle size distribution, respectively.

[0058] The metal magnetic particles may include two or more types of different metal magnetic particles. Here, different types of metal magnetic particles may mean that the metal magnetic particles are distinguished from each other based on at least one of average particle size, composition, component ratio, crystallinity, and shape.

[0059] The insulating material may include epoxy resin, polyimide, liquid crystal polymer, etc., alone or in combination, but is not limited thereto.

[0060] There is no particular limitation on the method of forming the magnetic body 100. For example, the magnetic body 100 may be formed by placing a sheet made of a magnetic material on the upper and lower portions of the first and second coils 200 and 300, and then pressing and curing the sheet.

[0061] The first coil 200 and the second coil 300 are disposed inside the magnetic body 100 and exhibit characteristics of a coil electronic component. For example, when the coil electronic component 1000 of the present embodiment is used as a power inductor, if current is applied to the first coil 200 and the second coil 300, the first coil 200 and the second coil 300 can store an electric field as a magnetic field and maintain an output voltage to perform a function of stabilizing the power of an electronic device.

[0062] The first coil 200 and the second coil 300 may be magnetically coupled to each other to form a coupled inductor structure.

[0063] The first coil 200 may include at least one turn of the first conductive wire 201, and the second coil 300 may include at least one turn of the second conductive wire 301. For example, the first coil 200 and the second coil 300 may be formed by spirally winding a metal wire (e.g., a metal wire including copper (Cu) or silver (Ag)) whose surface is coated with an insulating material.

[0064] That is, the first coil 200 and the second coil 300 may be wound coils. The first coil 200 and the second coil 300 are not limited to a single wire, and may be formed using a twisted wire or two or more wires.

[0065] The first coil 200 and the second coil 300 may be coils having a circular cross section, but are not limited thereto. For example, the first coil 200 and the second coil 300 may be various known coils, such as coils having a rectangular cross section.

[0066] The cross-section of each wire of the first coil 200 and the second coil 300 may have various well-known shapes, such as a quadrilateral, a circle, an ellipse, a triangle, and the like.

[0067] However, the length of the first conductive wire 201 of the first coil 200 may be greater than the length of the second conductive wire 301 of the second coil 300, and the cross-sectional area of ​​the first conductive wire 201 may be different from the cross-sectional area of ​​the second conductive wire 301. In addition, the cross-sectional area of ​​the first conductive wire 201 may be greater than the cross-sectional area of ​​the second conductive wire 301.

[0068] Reference Figure 4 , the cross section of the first conductive line 201 has a rectangular shape, and the cross section of the second conductive line 301 also has a rectangular shape. However, the thickness t1 of the first conductive line 201 is greater than the thickness t2 of the second conductive line 301. The width w1 of the first conductive line 201 is equal to the width w2 of the second conductive line 301. Figure 4In the figure, for the convenience of description, in addition to the thickness of the insulating film IF, the thickness and width of the first conductive line and the thickness and width of the second conductive line are respectively shown, but since this is only an example, the thickness and width of the first conductive line and the thickness and width of the second conductive line may be the thickness and width including the thickness of the insulating film IF.

[0069] Here, the length of the first conductive wire 201 and the length of the second conductive wire 301 are measured based on the center of the cross section of each conductive wire. If the conductive wire has a meander shape, the length of the conductive wire is obtained by measuring the length of the straight portion respectively and then adding the measured values. For example, if the coil is rectangular when viewed in the T-axis direction, the first conductive wire has a "meander shape". In this case, the "straight portion" is the four sides of the rectangle, so the length of the first conductive wire can be obtained by measuring the length of each of the four sides and adding the values ​​together.

[0070] In addition, the thickness and width of the first conductive wire 201 and the thickness and width of the second conductive wire 301 are measured based on SEM photographs of a cross-section (hereinafter referred to as "LT cross-section") perpendicular to the width direction (W-axis direction) cut along the length direction (L-axis direction) and the thickness direction (T-axis direction) at the central part of the width direction (W-axis direction) of the coil electronic component 1000.

[0071] For example, in the LT cross-sectional photograph, the thickness of the first conductive wire 201 (or the second conductive wire 301) may be the arithmetic average of the thicknesses at three points equally spaced apart on the first conductive wire 201 (or the second conductive wire 301) at the outermost turn of the first conductive wire 201 (or the second conductive wire 301).

[0072] In addition, in the LT cross-sectional photograph, the width of the first conductive wire 201 (or the second conductive wire 301) can be the arithmetic average of the widths of the first conductive wire 201 (or the second conductive wire 301) at three points spaced apart at equal intervals at the outermost turn of the first conductive wire 201 (or the second conductive wire 301).

[0073] In addition, refer to Figure 3 , the first external electrode 500 and the second external electrode 600 are disposed on the sixth surface S6 of the magnetic body 100 and are electrically connected to the first coil 200. In addition, the third external electrode 700 and the fourth external electrode 800 are disposed on the sixth surface S6 of the magnetic body 100 and are electrically connected to the second coil 300. Figure 4The first coil 200 is disposed above the second coil 300 (in the T-axis direction of the first coil 200 and the sixth surface S6 of the magnetic body 100), so the distance between the first coil 200 and the sixth surface S6 of the magnetic body 100 is greater than the distance between the second coil 300 and the sixth surface S6 of the magnetic body 100. In order to connect the first coil 200 to the first and second external electrodes 500 and 600, and in order to connect the second coil 300 to the third and fourth external electrodes 700 and 800, the length of the first coil 200 should be longer than the length of the second coil 300. In particular, since the length difference between the first coil 200 and the second coil 300 increases as the number of turns of the first coil 200 and the second coil 300 increases, the difference between the DC resistance Rdc of the first conductive wire 201 and the DC resistance Rdc of the second conductive wire 301 also increases.

[0074] Table 1 shows expected values ​​of a difference in DC resistance Rdc according to a length difference between the first conductive wire 201 of the first coil 200 and the second conductive wire 301 of the second coil 300 when the cross-sectional areas are the same.

[0075] (Table 1)

[0076]

[0077]

[0078] Referring to Table 1, when the cross-sectional area of ​​the conductive wire is 0.005mm 2 And when the length difference between the first conductive line and the second conductive line is 0.3 mm, the expected Rdc difference is 10.32 mohm. These Rdc differences are large and may need to be compensated.

[0079] According to an embodiment of the present disclosure, the cross-sectional shape of the first conductive wire 201 is a rectangle, and the cross-sectional shape of the second conductive wire 301 is also a rectangle. The thickness t1 of the first conductive wire 201 is greater than the thickness t2 of the second conductive wire 301, and the width w1 of the first conductive wire 201 is equal to the width w2 of the second conductive wire 301. Therefore, the cross-sectional area of ​​the first conductive wire 201 is greater than the cross-sectional area of ​​the second conductive wire 301. Therefore, compared with the case where the cross-sectional area of ​​the first conductive wire 201 and the cross-sectional area of ​​the second conductive wire 301 are the same, the value of the DC resistance in the first conductive wire 201 can be smaller. Therefore, the difference in DC resistance between the first conductive wire 201 and the second conductive wire 301 can be reduced, and the difference in inductance between the first coil 200 and the second coil 300 can also be reduced.

[0080] Furthermore, in another embodiment, the cross-section of the first conductive wire may have various known shapes, such as a circle, an ellipse, a triangle, etc. The cross-section of the second conductive wire may also have various known shapes, such as a circle, an ellipse, a triangle, etc. Even in this case, the DC resistance difference between the first coil and the second coil may be reduced by adjusting the cross-sectional areas of the first conductive wire and the second conductive wire, and thus the inductance difference may also be reduced.

[0081] For example, in some embodiments, each cross section of the first conductive line and the second conductive line may have a rectangular shape with rounded edges. For example, in this case, the first conductive line and the second conductive line may have a major axis and a minor axis that intersect each other at the center of each cross section. The major axis of any one cross section of the first conductive line (or the second conductive line) may be a line segment connecting two tangents of each of the outermost points of two edges facing the first direction (e.g., L-axis direction) in the corresponding cross section. That is, the major axis may be the longest line segment connecting the two edges of a specific cross section of the conductive line facing the first direction. In addition, the minor axis of any one cross section of the first conductive line (or the second conductive line) may be a line segment connecting two tangents of each of the outermost points of two edges facing the second direction (e.g., T-axis direction) intersecting the first direction in the corresponding cross section. That is, the minor axis may be the longest line segment connecting the two edges of a specific cross section of the conductive line facing the second direction. When the radius of curvature of each side of the first conductive line and the second conductive line is the same, the area of ​​the first conductive line and the second conductive line is proportional to the product of the length of the major axis and the length of the minor axis passing through the center of each cross section. For example, if the length of the major axis of the first conductive wire is greater than the length of the major axis of the second conductive wire, and the length of the minor axis of the first conductive wire is equal to the length of the minor axis of the second conductive wire, the cross-sectional area of ​​the first conductive wire is greater than the cross-sectional area of ​​the second conductive wire. In addition, when the length of the major axis of the first conductive wire is equal to the length of the major axis of the second conductive wire, and the length of the minor axis of the first conductive wire is greater than the length of the minor axis of the second conductive wire, the cross-sectional area of ​​the first conductive wire is greater than the cross-sectional area of ​​the second conductive wire. Therefore, each cross-sectional area of ​​the first conductive wire and the second conductive wire can be adjusted by adjusting the length of the major axis and the minor axis of the first conductive wire and the length of the major axis and the minor axis of the second conductive wire, respectively. Here, the length of the major axis and the minor axis of the first conductive wire 201 (or the second conductive wire 301) is based on the SEM photo of the cross section (hereinafter referred to as "LT cross section") perpendicular to the width direction (W axis direction) cut along the length direction (L axis direction) and the thickness direction (T axis direction) at the central part of the width direction (W axis direction) of the coil electronic component 1000.

[0082] For example, the length of the major axis of the first conductive wire 201 (or the second conductive wire 301) may be the arithmetic mean of the lengths of the major axis at five points spaced at equal intervals on the first conductive wire 201 (or the second conductive wire 301) at the outermost turn shown in the above LT cross-sectional photograph. In addition, the length of the minor axis of the first conductive wire 201 (or the second conductive wire 301) may be the arithmetic mean of the lengths of the minor axis at five points spaced at equal intervals on the first conductive wire 201 (or the second conductive wire 301) at the outermost turn shown in the above LT cross-sectional photograph. In addition, each cross-sectional area of ​​the first conductive wire and the second conductive wire may be adjusted by accurately measuring the area using known image analysis software.

[0083] The first coil 200 and the second coil 300 may have a plurality of turns and may be edgewise coils.

[0084] For example, the first coil 200 may have an outermost coil C1 and an innermost coil C2 sequentially from the fifth surface S5 to the sixth surface S6 of the coil electronic component 1000. In addition, although not shown, at least one intermediate coil may be provided between the outermost coil C1 and the innermost coil C2.

[0085] Similarly, the second coil 300 may have an outermost coil C1' and an innermost coil C2' in sequence from the sixth surface S6 to the fifth surface S5 of the coil electronic component 1000. In addition, although not shown, at least one intermediate coil may be provided between the outermost coil C1' and the innermost coil C2'.

[0086] The insulating film IF may be disposed along the surface of each of the plurality of turns of the first coil 200 and the second coil 300. The insulating film IF is used to protect the plurality of turns of the first coil 200 and the second coil 300 and to insulate the plurality of turns of the first coil 200 and the second coil 300, and may include a known insulating material such as polyparaxylene. Any insulating material may be included in the insulating film IF, and there is no particular limitation. For example, the insulating film IF may be a polyurethane resin, a polyester resin, an epoxy resin, or a polyamide-imide resin. The insulating film IF may be formed by a method such as vapor deposition, but is not limited thereto.

[0087] In addition, the shapes of the first coil 200 and the second coil 300 are not limited to the above shapes, and may have various known shapes. For example, the first coil 200 may have an outermost coil, one or more intermediate coils, and an innermost coil in sequence from the outer surface of the magnetic body 100 to the inner side. Similarly, the second coil 300 may have an outermost coil, one or more intermediate coils, and an innermost coil in sequence from the outer surface of the magnetic body 100 to the inner side.

[0088] The first coil 200 may include a winding portion 210 and a lead portion 220 .

[0089] The winding portion 210 is a portion where the metal wire forms at least one turn.

[0090] The lead portion 220 extends from both ends of the winding portion 210 and is respectively exposed to the sixth surface S6 of the magnetic body 100. The lead portion 220 includes a first lead portion 223 and a second lead portion 225. The first lead portion 223 extends from one end of the winding portion 210 and is exposed to the sixth surface S6 of the magnetic body 100, and the second lead portion 225 extends from the other end of the winding portion 210 and is exposed to the sixth surface S6 of the magnetic body 100. Portions of the first lead portion 223 and the second lead portion 225 exposed to the sixth surface S6 of the magnetic body 100 may be spaced apart from each other in the length direction (L-axis direction), but are not limited thereto.

[0091] The second coil 300 may include a winding portion 310 and a lead portion 320 .

[0092] The winding portion 310 is a portion where the metal wire forms at least one turn.

[0093] The lead portion 320 extends from both ends of the winding portion 310 and is respectively exposed to the sixth surface S6 of the magnetic body 100. The lead portion 320 includes a first lead portion 323 and a second lead portion 325. The first lead portion 323 extends from one end of the winding portion 310 and is exposed to the sixth surface S6 of the magnetic body 100, and the second lead portion 325 extends from the other end of the winding portion 310 and is exposed to the sixth surface S6 of the magnetic body 100. Portions of the first lead portion 323 and the second lead portion 325 exposed to the sixth surface S6 of the magnetic body 100 may be spaced apart from each other in the length direction (L-axis direction), but are not limited thereto.

[0094] The intermediate layer 400 is disposed between the first coil 200 and the second coil 300. For example, the intermediate layer 400 may be in contact with the first coil 200 and the second coil 300.

[0095] When viewed in the thickness direction (T-axis direction), the intermediate layer 400 may have an elliptical shape or a racetrack shape, but is not limited thereto. The intermediate layer 400 may have a shape similar to the winding portion 210 of the first coil 200 or the winding portion 310 of the second coil 300 .

[0096] The intermediate layer 400 may be disposed to extend from a first region R1 between the first core 230 of the first coil 200 and the second core 330 of the second coil 300 to a second region R2 between the first coil 200 and the second coil 300. The intermediate layer 400 may extend beyond the second region R2 to contact the outer surface of the magnetic body 100. For example, the intermediate layer 400 may contact the first surface S1 and the second surface S2 of the magnetic body 100.

[0097] The first core 230 may be a region in which the first hollow space of the first coil 200 is at least partially filled with the magnetic body 100. The second core 330 may be a region in which the second hollow space of the second coil 300 is at least partially filled with the magnetic body 100. That is, the magnetic body 100 filling the first hollow space of the first coil 200 may form a first core around which the first coil 200 is wound, and the magnetic body 100 filling the second hollow space of the second coil 300 may form a second core around which the second coil 300 is wound. The thickness of the intermediate layer 400 located in the first region R1 may be the same as the thickness of the intermediate layer 400 located in the second region R2.

[0098] The thickness of the intermediate layer 400 is measured based on an optical microscope or scanning electron microscope (SEM) photograph in the following cross section: a cross section in the length direction (L axis direction)-thickness direction (T axis direction) at the central portion of the coil electronic component 1000 in the width direction (W axis direction). The thickness of the intermediate layer 400 in the first region R1 may be the arithmetic mean of the thickness of the intermediate layer 400 at ten points spaced at equal intervals on the intermediate layer 400 in the first region R1 of the coil electronic component 1000 shown in the above-mentioned LT cross-sectional photograph. The thickness of the intermediate layer 400 in the second region R2 may be the arithmetic mean of the thickness of the intermediate layer 400 at three points spaced at equal intervals on the intermediate layer 400 in the second region R2 of the coil electronic component 1000 shown in the above-mentioned LT cross-sectional photograph.

[0099] The thickness of the intermediate layer 400 in the first region R1 may be different from the thickness of the intermediate layer 400 in the second region R2. For example, the intermediate layer 400 may extend from the first region R1 to a portion of the first core 230, or may extend from the first region R1 to a portion of the second core 330. On the other hand, the intermediate layer 400 may extend from the first region R1 to a portion of the first core 230 and a portion of the second core 330.

[0100] When the intermediate layer 400 extends from the first region R1 to a portion of the first core 230, the portion of the first core 230 may be filled with the intermediate layer 400, and the remaining portion of the first core 230 may be filled with the magnetic body 100. In addition, when the intermediate layer 400 extends from the first region R1 to a portion of the second core 330, the portion of the second core 330 may be filled with the intermediate layer 400, and the remaining portion of the second core 330 may be filled with the magnetic body 100. In this case, the magnetic body 100 and the intermediate layer 400 filling the first hollow space of the first coil 200 may form the first core 230 around which the first coil 200 is wound, and the magnetic body 100 and the intermediate layer 400 filling the second hollow space of the second coil 300 may form the second core 330 around which the second coil 300 is wound.

[0101] In addition, the intermediate layer 400 may include a magnetic material and affect magnetic coupling characteristics of the first coil 200 and the second coil 300. The intermediate layer 400 includes magnetic particles and an insulating material interposed between the magnetic particles.

[0102] The magnetic particles may include first magnetic metal particles, second magnetic metal particles having a larger particle size than the first magnetic metal particles, and third magnetic metal particles having a larger particle size than the second magnetic metal particles. 50 The average particle size D of the second magnetic metal particles may be about 0.1 μm or more and about 0.2 μm or less. 50 The average particle size D of the third magnetic metal particles may be about 1 μm or more and about 2 μm or less. 50 It may be about 25 μm or more and about 30 μm or less.

[0103] The magnetic particles may include ferrite particles or metal magnetic particles exhibiting magnetic properties.

[0104] The ferrite particles may include, for example, at least one of spinel ferrites (such as Mg-Zn-based ferrites, Mn-Zn-based ferrites, Mn-Mg-based ferrites, Cu-Zn-based ferrites, Mg-Mn-Sr-based ferrites, Ni-Zn-based ferrites, etc.), hexagonal ferrites (such as Ba-Zn-based ferrites, Ba-Mg-based ferrites, Ba-Ni-based ferrites, Ba-Co-based ferrites, Ba-Ni-Co-based ferrites, etc.), garnet-type ferrites (such as Y-based ferrites, etc.) and Li-based ferrites.

[0105] The metal magnetic particles may include two or more types of particles having different compositions, and may include one or more selected from the group consisting of iron (Fe), silicon (Si), chromium (Cr), cobalt (Co), molybdenum (Mo), aluminum (Al), niobium (Nb), copper (Cu), and nickel (Ni). For example, the metal magnetic particles may include at least one of pure iron, Fe-Si-based alloys, Fe-Si-Al-based alloys, Fe-Ni-based alloys, Fe-Ni-Mo-based alloys, Fe-Ni-Mo-Cu-based alloys, Fe-Co-based alloys, Fe-Ni-Co-based alloys, Fe-Cr-based alloys, Fe-Cr-Si-based alloys, Fe-Si-Cu-Nb-based alloys, Fe-Ni-Cr-based alloys, and Fe-Cr-Al-based alloys. Here, different compositions of the metal magnetic particles may also mean different contents.

[0106] The metal magnetic particles may be amorphous or crystalline. For example, the metal magnetic particles may include a Fe-Si-B-Cr based amorphous alloy, but the present embodiment is not limited thereto. The metal magnetic particles may have an average particle size of about 0.1 μm to about 30 μm, but is not limited thereto. In this specification, the average particle size may be referred to as D 90 or D 50 The particle size distribution is a particle size distribution of particles. The particle size distribution is well known to those skilled in the art as an indicator of the proportion of particles of a certain size (particle diameter) contained in the particle group to be measured. D50 (the particle diameter corresponding to 50% of the cumulative volume of the particle size distribution) refers to the average particle size.

[0107] The metal magnetic particles may include two or more types of different metal magnetic particles. Here, different types of metal magnetic particles may mean that the metal magnetic particles are distinguished from each other based on at least one of average particle size, composition, component ratio, crystallinity, and shape.

[0108] The insulating material may include epoxy resin, polyimide, liquid crystal polymer, etc., alone or in combination, but is not limited thereto.

[0109] The intermediate layer 400 includes the above materials, but the magnetic permeability of the intermediate layer 400 may be less than or greater than the magnetic permeability of the magnetic body 100. In addition, the magnetic permeabilities of the magnetic body 100 and the intermediate layer 400 may be appropriately set to adjust the coupling coefficient K between the first coil 200 and the second coil 300.

[0110] For example, a method of adjusting the magnetic permeability of the magnetic body 100 and the intermediate layer 400 may be to make the volume fraction of the first magnetic particles included in the magnetic body 100 and the volume fraction of the second magnetic particles included in the intermediate layer 400 different. Here, the volume fraction of the magnetic particles means the ratio of the volume of the first magnetic particles to the volume of the magnetic body 100, or the ratio of the volume of the second magnetic particles to the volume of the intermediate layer 400. In order to adjust the relative magnetic permeability of the magnetic body 100 and the intermediate layer 400 using the volume fractions of the first magnetic particles and the second magnetic particles, the first magnetic particles and the second magnetic particles may be implemented as the same material, for example, a metal alloy of the same composition. In addition, as a method of adjusting the magnetic permeability of the magnetic body 100 and the intermediate layer 400, when controlled by the cross-sectional area, the area fraction of the first magnetic particles included in the magnetic body 100 and the area fraction of the second magnetic particles included in the intermediate layer 400 may be made different from each other. Here, the area fraction of the magnetic particles means the ratio of the cross-sectional area of ​​the first magnetic particles to the cross-sectional area of ​​the magnetic body 100, or the ratio of the cross-sectional area of ​​the second magnetic particles to the cross-sectional area of ​​the intermediate layer 400.

[0111] The case where the magnetic permeability of the intermediate layer 400 is greater than the magnetic permeability of the magnetic body 100 may be a case where the volume fraction of the second magnetic particles included in the intermediate layer 400 is greater than the volume fraction of the first magnetic particles included in the magnetic body 100. When the magnetic permeability of the intermediate layer 400 is greater than the magnetic permeability of the magnetic body 100, the coupling coefficient between the first coil 200 and the second coil 300 may be relatively reduced. Here, the relative reduction in the coupling coefficient means that the coupling coefficient is reduced compared to the case where the magnetic permeability of the intermediate layer 400 and the magnetic permeability of the magnetic body 100 are the same. When the magnetic permeability of the intermediate layer 400 is relatively large, the amount of magnetic flux flowing through the intermediate layer 400 is relatively large, and the mutual inductance caused by the magnetic flux shared by the first coil 200 and the second coil 300 becomes smaller. Here, the magnetic flux flowing through the intermediate layer 400 may be understood as the magnetic flux flowing through the intermediate layer 400. Figure 4 The liquid flows through the intermediate layer 400 along the length direction (L-axis direction).

[0112] As a result, since the mutual inductance between the first coil 200 and the second coil 300 becomes smaller and the leakage inductance formed only in the first coil 200 or the second coil 300 becomes larger, the coupling coefficient between the first coil 200 and the second coil 300 becomes smaller.

[0113] On the contrary, the case where the magnetic permeability of the intermediate layer 400 is less than the magnetic permeability of the magnetic body 100 may be a case where the volume fraction of the second magnetic particles included in the intermediate layer 400 is less than the volume fraction of the first magnetic particles included in the magnetic body 100. When the magnetic permeability of the intermediate layer 400 is less than the magnetic permeability of the magnetic body 100, the coupling coefficient between the first coil 200 and the second coil 300 may be relatively increased. Here, the relative increase in the coupling coefficient means that the coupling coefficient is increased compared to the case where the magnetic permeability of the intermediate layer 400 and the magnetic permeability of the magnetic body 100 are the same. When the magnetic permeability of the intermediate layer 400 is relatively small, the amount of magnetic flux flowing through the intermediate layer 400 is relatively small, and the mutual inductance caused by the magnetic flux shared by the first coil 200 and the second coil 300 becomes larger. Here, the magnetic flux flowing through the intermediate layer 400 may be understood as the magnetic flux flowing through the intermediate layer 400. Figure 4 The liquid flows through the intermediate layer 400 along the length direction (L-axis direction).

[0114] As a result, since the mutual inductance between the first coil 200 and the second coil 300 becomes larger and the leakage inductance formed only in the first coil 200 or the second coil 300 becomes smaller, the coupling coefficient between the first coil 200 and the second coil 300 becomes larger.

[0115] The first and second external electrodes 500 and 600 are disposed outside the magnetic body 100 and are electrically connected to the first coil 200 .

[0116] The first external electrode 500 is disposed on the sixth surface S6 of the magnetic body 100 . The first lead part 223 of the first coil 200 is exposed to the sixth surface S6 of the magnetic body 100 and is connected to the first external electrode 500 .

[0117] The second external electrode 600 is disposed on the sixth surface S6 of the magnetic body 100 . The second lead part 225 of the first coil 200 is exposed to the sixth surface S6 of the magnetic body 100 and is connected to the second external electrode 600 .

[0118] The first and second external electrodes 500 and 600 may include a conductive material such as copper (Cu), aluminum (Al), silver (Ag), tin (Sn), gold (Au), nickel (Ni), lead (Pb), chromium (Cr), titanium (Ti), or alloys thereof, but are not limited thereto.

[0119] The first and second external electrodes 500 and 600 may include a plurality of metal layers formed by plating a conductive metal.

[0120] Reference Figure 1 In the right circle, the first external electrode 500 may include a first metal layer 501 , a second metal layer 502 , and a third metal layer 503 .

[0121] The first metal layer 501 may include copper (Cu) as a plating layer in contact with the first lead portion 223 of the first coil 200 and the outer surface of the magnetic body 100. The second metal layer 502 may include nickel (Ni) as a plating layer covering the first metal layer 501. The third metal layer 503 may include tin (Sn) as a plating layer covering the second metal layer 502. However, the present embodiment is not limited to such a three-layer structure, and a two-layer structure in which only one plating layer is added on the first metal layer 501 is also feasible.

[0122] Reference Figure 1 In the left circle, the second external electrode 600 may include a first metal layer 601 , a second metal layer 602 , and a third metal layer 603 .

[0123] The first metal layer 601 may include copper (Cu) as a plating layer in contact with the second lead portion 225 of the first coil 200 and the outer surface of the magnetic body 100. The second metal layer 602 may include nickel (Ni) as a plating layer covering the first metal layer 601. The third metal layer 603 may include tin (Sn) as a plating layer covering the second metal layer 602. However, the present embodiment is not limited to such a three-layer structure, and a two-layer structure in which only one plating layer is added on the first metal layer 601 is also feasible.

[0124] As described above, the first external electrode 500 and the second external electrode 600 may include nickel (Ni), copper (Cu), palladium (Pd), gold (Au) or alloys thereof, and may include a plurality of plating layers. For example, the first external electrode 500 and the second external electrode 600 may include various combinations of a nickel (Ni) layer, a copper (Cu) layer, a nickel / copper (Ni / Cu) layer (a stacked metal layer of a nickel (Ni) layer and a copper (Cu) layer stacked in this order), a palladium / nickel (Pd / Ni) layer (a stacked metal layer of a palladium (Pd) layer and a nickel (Ni) layer stacked in this order), a palladium / nickel / copper (Pd / Ni / Cu) layer (a stacked metal layer of a palladium (Pd) layer, a nickel (Ni) layer and a copper (Cu) layer stacked in this order), and a copper / nickel / copper (Cu / Ni / Cu) layer (a stacked metal layer of a copper (Cu) layer, a nickel (Ni) layer and a copper (Cu) layer stacked in this order).

[0125] In some embodiments, the outermost layers of the first and second external electrodes 500 and 600 may also be formed of tin (Sn). The tin (Sn) plating has a relatively low melting point, which can improve the ease of mounting the first and second external electrodes 500 and 600 on a substrate.

[0126] Generally, the tin (Sn) plating layer can be bonded to the electrode pad located on the substrate through a solder including a tin (Sn)-copper (Cu)-silver (Ag) alloy paste. That is, the tin (Sn) plating layer can be melted and bonded to the solder during a heat treatment (reflow) process.

[0127] The third and fourth external electrodes 700 and 800 are disposed outside the magnetic body 100 and are electrically connected to the second coil 300 .

[0128] The third external electrode 700 is disposed on the sixth surface S6 of the magnetic body 100 , and the first lead portion 323 of the second coil 300 is exposed to the sixth surface S6 of the magnetic body 100 and connected to the third external electrode 700 .

[0129] The fourth external electrode 800 is disposed on the sixth surface S6 of the magnetic body 100 , and the second lead part 325 of the second coil 300 is exposed to the sixth surface S6 of the magnetic body 100 and connected to the fourth external electrode 800 .

[0130] The structures and components of the third and fourth external electrodes 700 and 800 are the same as those of the above-described first and second external electrodes 500 and 600 , and thus redundant descriptions thereof will be omitted.

[0131] Furthermore, in the magnetic body 100 of the coil electronic component 1000 according to the embodiment, regions other than regions where the first to fourth external electrodes 500 , 600 , 700 , and 800 are disposed may be provided with the insulating layer 900 .

[0132] In contrast, on the sixth surface S6 of the magnetic body 100, an insulating layer may be present in an area between an exposed portion of the first lead portion 223 of the first coil 200, an exposed portion of the second lead portion 225 of the first coil 200, an exposed portion of the first lead portion 323 of the second coil 300, and an exposed portion of the second lead portion 325 of the second coil 300.

[0133] In this case, the first to fourth external electrodes 500 , 600 , 700 , and 800 may cover a portion of the insulating layer.

[0134] As described above, the insulating layer 900 is disposed on at least a portion of the first, second, third, fourth, fifth, and sixth surfaces S1, S2, S3, S4, S5, and S6 of the magnetic body 100 to prevent electrical short circuits between other electronic components and the external electrodes 500, 600, 700, and 800.

[0135] When the external electrodes 500 , 600 , 700 , and 800 are formed by electrolytic plating, the insulating layer 900 may be used as a plating resist, but is not limited thereto.

[0136] Figure 5 is a bottom perspective view schematically showing a coil electronic component according to another embodiment.

[0137] Reference Figure 5 , the first external electrode 2500 of the coil electronic component 2000 according to another embodiment may be connected to the first lead portion 223 of the first coil 200 on the sixth surface S6 of the magnetic body 100, and may extend to the second surface S2 of the magnetic body 100. In addition, the second external electrode 2600 may be connected to the second lead portion 225 of the first coil 200 on the sixth surface S6 of the magnetic body 100, and may extend to the first surface S1 of the magnetic body 100.

[0138] The third external electrode 2700 may be connected to the first lead portion 323 of the second coil 300 on the sixth surface S6 of the magnetic body 100, and may extend to the first surface S1 of the magnetic body 100. In addition, the fourth external electrode 2800 may be connected to the second lead portion 325 of the second coil 300 on the sixth surface S6 of the magnetic body 100, and may extend to the second surface S2 of the magnetic body 100.

[0139] In addition to the above, other components and Figure 1 The coil electronic components are the same as those shown in , so their redundant description will be omitted.

[0140] Figure 6 is a bottom perspective view schematically showing a coil electronic component according to another embodiment.

[0141] Reference Figure 6 , the first external electrode 3500 of the coil electronic component 3000 according to another embodiment may be connected to the first lead portion 223 of the first coil 200 on the sixth surface S6 of the magnetic body 100, and may extend to the second surface S2 and the fifth surface S5 of the magnetic body 100. In addition, the second external electrode 3600 may be connected to the second lead portion 225 of the first coil 200 on the sixth surface S6 of the magnetic body 100, and may extend to the first surface S1 and the fifth surface S5 of the magnetic body 100.

[0142] The third external electrode 3700 may be connected to the first lead portion 323 of the second coil 300 on the sixth surface S6 of the magnetic body 100, and may extend to the first surface S1 and the fifth surface S5 of the magnetic body 100. In addition, the fourth external electrode 3800 may be connected to the second lead portion 325 of the second coil 300 on the sixth surface S6 of the magnetic body 100, and may extend to the second surface S2 and the fifth surface S5 of the magnetic body 100.

[0143] In addition to the above, other components and Figure 1 The coil electronic components are the same as those shown in , so their redundant description will be omitted.

[0144] Figure 7Schematically shows a coil electronic component according to another embodiment Figure 4 The corresponding cross-sectional view.

[0145] Reference Figure 7 , a coil electronic component 4000 according to another embodiment may include a magnetic body 100 , a first coil 4200 , a second coil 4300 , and an intermediate layer 400 .

[0146] The first coil 4200 may include at least one turn of the first conductive wire 4201, and the second coil 4300 may include at least one turn of the second conductive wire 4301. The length of the first conductive wire 4201 of the first coil 4200 may be greater than the length of the second conductive wire 4301 of the second coil 4300.

[0147] According to this embodiment, the cross-sectional shape of the first conductive wire 4201 is a rectangle, and the cross-sectional shape of the second conductive wire 4301 is also a rectangle. The width w3 of the first conductive wire 4201 is greater than the width w4 of the second conductive wire 4301, and the thickness t3 of the first conductive wire 4201 is equal to the thickness t4 of the second conductive wire 4301. Therefore, the cross-sectional area of ​​the first conductive wire 4201 is greater than the cross-sectional area of ​​the second conductive wire 4301. Compared with the case where the cross-sectional area of ​​the first conductive wire 4201 and the cross-sectional area of ​​the second conductive wire 4301 are the same, the DC resistance of the first conductive wire 4201 can be smaller. Therefore, the difference in DC resistance between the first conductive wire 4201 and the second conductive wire 4301 can be reduced, and the difference in inductance between the first coil 4200 and the second coil 4300 can also be reduced.

[0148] The intermediate layer 400 may be disposed between the first coil 4200 and the second coil 4300 , and may make contact with the first surface S1 and the second surface S2 of the magnetic body 100 .

[0149] In addition to the above, other components and Figure 1 The coil electronic components are the same as those shown in , so their redundant description will be omitted.

[0150] Hereinafter, specific examples of the present disclosure are provided. However, the examples described below are only intended to specifically illustrate or explain the present disclosure, and the scope of the present disclosure should not be limited thereto.

[0151] [Manufacturing example: Manufacture of coil electronic components]

[0152] (Example 1)

[0153] Manufacturing a coil electronic component, in which the cross-sectional area A1 of the first conductive wire of the first coil is 0.3 mm×0.08 mm=0.024 mm 2The cross-sectional area A2 of the second conductive wire of the second coil is 0.23 mm × 0.08 mm = 0.0184 mm 2 , and a value B1-B2 obtained by subtracting the length B2 of the second conductive line from the length B1 of the first conductive line is 0.2 mm.

[0154] (Example 2)

[0155] Manufacturing a coil electronic component, in which the cross-sectional area A1 of the first conductive wire of the first coil is 0.23 mm×0.1 mm=0.023 mm 2 The cross-sectional area A2 of the second conductive wire of the second coil is 0.0184 mm 2 , and a value B1-B2 obtained by subtracting the length B2 of the second conductive line from the length B1 of the first conductive line is 0.2 mm.

[0156] (Comparative Example 1)

[0157] Manufacturing a coil electronic component, in which the cross-sectional area A1 of the first conductive wire of the first coil is 0.3 mm×0.08 mm=0.024 mm 2 The cross-sectional area A2 of the second conductive wire of the second coil is 0.0184 mm 2 , and a value B1-B2 obtained by subtracting the length B2 of the second conductive line from the length B1 of the first conductive line is 0.5 mm.

[0158] (Example 3)

[0159] Manufacturing a coil electronic component, in which the cross-sectional area A1 of the first conductive wire of the first coil is 0.4 mm×0.08 mm=0.032 mm 2 The cross-sectional area A2 of the second conductive wire of the second coil is 0.0184 mm 2 , and a value B1-B2 obtained by subtracting the length B2 of the second conductive line from the length B1 of the first conductive line is 0.5 mm.

[0160] (Comparative Example 2)

[0161] Manufacturing a coil electronic component, in which the cross-sectional area A1 of the first conductive wire of the first coil is 0.23 mm×0.1 mm=0.023 mm 2 The cross-sectional area A2 of the second conductive wire of the second coil is 0.0184 mm 2 , and a value B1-B2 obtained by subtracting the length B2 of the second conductive line from the length B1 of the first conductive line is 0.5 mm.

[0162] (Example 4)

[0163] Manufacturing a coil electronic component, in which the cross-sectional area A1 of the first conductive wire of the first coil is 0.23 mm×0.14 mm=0.0322 mm 2 The cross-sectional area A2 of the second conductive wire of the second coil is 0.0184 mm 2 , and a value B1-B2 obtained by subtracting the length B2 of the second conductive line from the length B1 of the first conductive line is 0.5 mm.

[0164] (Example 5)

[0165] Manufacturing a coil electronic component, in which the cross-sectional area A1 of the first conductive wire of the first coil is 0.22 mm×0.08 mm=0.0176 mm 2 The cross-sectional area A2 of the second conductive wire of the second coil is 0.18 mm × 0.08 mm = 0.0144 mm 2 , and a value B1-B2 obtained by subtracting the length B2 of the second conductive line from the length B1 of the first conductive line is 0.2 mm.

[0166] (Example 6)

[0167] Manufacturing a coil electronic component, in which the cross-sectional area A1 of the first conductive wire of the first coil is 0.18 mm×0.1 mm=0.018 mm 2 The cross-sectional area A2 of the second conductive wire of the second coil is 0.0144 mm 2 , and a value B1-B2 obtained by subtracting the length B2 of the second conductive line from the length B1 of the first conductive line is 0.2 mm.

[0168] (Comparative Example 3)

[0169] Manufacturing a coil electronic component, in which the cross-sectional area A1 of the first conductive wire of the first coil is 0.22 mm×0.08 mm=0.0176 mm 2 The cross-sectional area A2 of the second conductive wire of the second coil is 0.0144 mm 2 , and a value B1-B2 obtained by subtracting the length B2 of the second conductive line from the length B1 of the first conductive line is 0.5 mm.

[0170] (Comparative Example 4)

[0171] Manufacturing a coil electronic component, in which the cross-sectional area A1 of the first conductive wire of the first coil is 0.25 mm×0.08 mm=0.02 mm 2 The cross-sectional area A2 of the second conductive wire of the second coil is 0.0144 mm 2, and a value B1-B2 obtained by subtracting the length B2 of the second conductive line from the length B1 of the first conductive line is 0.5 mm.

[0172] (Example 7)

[0173] Manufacturing a coil electronic component, in which the cross-sectional area A1 of the first conductive wire of the first coil is 0.31 mm×0.08 mm=0.0248 mm 2 The cross-sectional area A2 of the second conductive wire of the second coil is 0.0144 mm 2 , and a value B1-B2 obtained by subtracting the length B2 of the second conductive line from the length B1 of the first conductive line is 0.5 mm.

[0174] (Comparative Example 5)

[0175] Manufacturing a coil electronic component, in which the cross-sectional area A1 of the first conductive wire of the first coil is 0.18 mm×0.1 mm=0.018 mm 2 The cross-sectional area A2 of the second conductive wire of the second coil is 0.0144 mm 2 , and a value B1-B2 obtained by subtracting the length B2 of the second conductive line from the length B1 of the first conductive line is 0.5 mm.

[0176] (Example 8)

[0177] Manufacturing a coil electronic component, in which the cross-sectional area A1 of the first conductive wire of the first coil is 0.18 mm×0.14 mm=0.0252 mm 2 The cross-sectional area A2 of the second conductive wire of the second coil is 0.0144 mm 2 , and a value B1-B2 obtained by subtracting the length B2 of the second conductive line from the length B1 of the first conductive line is 0.5 mm.

[0178] (Example 9)

[0179] Manufacturing a coil electronic component, in which the cross-sectional area A1 of the first conductive wire of the first coil is 0.23 mm×0.05 mm=0.0115 mm 2 The cross-sectional area A2 of the second conductive wire of the second coil is 0.18 mm × 0.05 mm = 0.009 mm 2 , and a value B1-B2 obtained by subtracting the length B2 of the second conductive line from the length B1 of the first conductive line is 0.2 mm.

[0180] (Example 10)

[0181] Manufacturing a coil electronic component, in which the cross-sectional area A1 of the first conductive wire of the first coil is 0.18 mm×0.065 mm=0.0117 mm 2 The cross-sectional area A2 of the second conductive wire of the second coil is 0.009 mm 2 , and a value B1-B2 obtained by subtracting the length B2 of the second conductive line from the length B1 of the first conductive line is 0.2 mm.

[0182] (Comparative Example 6)

[0183] Manufacturing a coil electronic component, in which the cross-sectional area A1 of the first conductive wire of the first coil is 0.23 mm×0.05 mm=0.0115 mm 2 The cross-sectional area A2 of the second conductive wire of the second coil is 0.009 mm 2 , and a value B1-B2 obtained by subtracting the length B2 of the second conductive line from the length B1 of the first conductive line is 0.5 mm.

[0184] (Comparative Example 7)

[0185] Manufacturing a coil electronic component, in which the cross-sectional area A1 of the first conductive wire of the first coil is 0.25 mm×0.05 mm=0.0125 mm 2 The cross-sectional area A2 of the second conductive wire of the second coil is 0.009 mm 2 , and a value B1-B2 obtained by subtracting the length B2 of the second conductive line from the length B1 of the first conductive line is 0.5 mm.

[0186] (Example 11)

[0187] Manufacturing a coil electronic component, in which the cross-sectional area A1 of the first conductive wire of the first coil is 0.32 mm×0.05 mm=0.016 mm 2 The cross-sectional area A2 of the second conductive wire of the second coil is 0.009 mm 2 , and a value B1-B2 obtained by subtracting the length B2 of the second conductive line from the length B1 of the first conductive line is 0.5 mm.

[0188] (Comparative Example 8)

[0189] Manufacturing a coil electronic component, in which the cross-sectional area A1 of the first conductive wire of the first coil is 0.18 mm×0.07 mm=0.0126 mm 2 The cross-sectional area A2 of the second conductive wire of the second coil is 0.009 mm 2, and a value B1-B2 obtained by subtracting the length B2 of the second conductive line from the length B1 of the first conductive line is 0.5 mm.

[0190] (Example 12)

[0191] Manufacturing a coil electronic component, in which the cross-sectional area A1 of the first conductive wire of the first coil is 0.18 mm×0.09 mm=0.0162 mm 2 The cross-sectional area A2 of the second conductive wire of the second coil is 0.009 mm 2 , and a value B1-B2 obtained by subtracting the length B2 of the second conductive line from the length B1 of the first conductive line is 0.5 mm.

[0192] (Example 13)

[0193] Manufacturing a coil electronic component, in which the cross-sectional area A1 of the first conductive wire of the first coil is 0.15 mm×0.05 mm=0.0075 mm 2 The cross-sectional area A2 of the second conductive wire of the second coil is 0.10 mm×0.05 mm=0.005 mm 2 , and a value B1-B2 obtained by subtracting the length B2 of the second conductive line from the length B1 of the first conductive line is 0.2 mm.

[0194] (Example 14)

[0195] Manufacturing a coil electronic component, in which the cross-sectional area A1 of the first conductive wire of the first coil is 0.13 mm×0.05 mm=0.0065 mm 2 The cross-sectional area A2 of the second conductive wire of the second coil is 0.005 mm 2 , and a value B1-B2 obtained by subtracting the length B2 of the second conductive line from the length B1 of the first conductive line is 0.2 mm.

[0196] (Comparative Example 9)

[0197] Manufacturing a coil electronic component, in which the cross-sectional area A1 of the first conductive wire of the first coil is 0.13 mm×0.05 mm=0.0065 mm 2 The cross-sectional area A2 of the second conductive wire of the second coil is 0.005 mm 2 , and a value B1-B2 obtained by subtracting the length B2 of the second conductive line from the length B1 of the first conductive line is 0.5 mm.

[0198] (Comparative Example 10)

[0199] Manufacturing a coil electronic component, in which the cross-sectional area A1 of the first conductive wire of the first coil is 0.16 mm×0.05 mm=0.008 mm 2 The cross-sectional area A2 of the second conductive wire of the second coil is 0.005 mm 2 , and a value B1-B2 obtained by subtracting the length B2 of the second conductive line from the length B1 of the first conductive line is 0.5 mm.

[0200] (Example 15)

[0201] Manufacturing a coil electronic component, in which the cross-sectional area A1 of the first conductive wire of the first coil is 0.18 mm×0.05 mm=0.009 mm 2 The cross-sectional area A2 of the second conductive wire of the second coil is 0.005 mm 2 , and a value B1-B2 obtained by subtracting the length B2 of the second conductive line from the length B1 of the first conductive line is 0.5 mm.

[0202] (Comparative Example 11)

[0203] Manufacturing a coil electronic component, in which the cross-sectional area A1 of the first conductive wire of the first coil is 0.10 mm×0.07 mm=0.007 mm 2 The cross-sectional area A2 of the second conductive wire of the second coil is 0.005 mm 2 , and a value B1-B2 obtained by subtracting the length B2 of the second conductive line from the length B1 of the first conductive line is 0.5 mm.

[0204] (Example 16)

[0205] Manufacturing a coil electronic component, in which the cross-sectional area A1 of the first conductive wire of the first coil is 0.10 mm×0.09 mm=0.009 mm 2 The cross-sectional area A2 of the second conductive wire of the second coil is 0.005 mm 2 , and a value B1-B2 obtained by subtracting the length B2 of the second conductive line from the length B1 of the first conductive line is 0.5 mm.

[0206] [Experimental example: Performance of coil electronic components]

[0207] After manufacturing 30 coil electronic components of Examples 1 to 16 and Comparative Examples 1 to 11, respectively, the cross-sectional area A1 and length B1 of the first conductive wire of the first coil, the cross-sectional area A2 and length B2 of the second conductive wire of the second coil were measured, and ((A1-A2) / A2)×100, (B1-B2) and the Rdc difference (Rdc1-Rdc2) between the first coil and the second coil were calculated. The measurement and calculation results are summarized in Table 2.

[0208] (Table 2)

[0209]

[0210]

[0211] Referring to Table 2, in the coil electronic components manufactured according to Examples 1 to 16, the Rdc difference between the first coil and the second coil is less than 1 mohm. When the difference in length between the first coil and the second coil is relatively small, such as 0.2 mm compared to 0.5 mm in Examples 1 and 2, it can be seen that when the difference in the cross-sectional area of ​​the first conductive wire and the cross-sectional area of ​​the second conductive wire is not large, 30% and 25%, the difference in Rdc is 0.125 mohm and 0.374 mohm, so that the improvement in DC resistance is achieved. When the difference in length between the first coil and the second coil is relatively large, such as 0.5 mm compared to 0.2 mm in Example 3, it can be seen that the difference in the cross-sectional area of ​​the first conductive wire and the cross-sectional area of ​​the second conductive wire is also relatively large, 74%, and the difference in Rdc is 0.303 mohm, so the effect of improving DC resistance is observed.

[0212] In contrast, in the coil electronic components manufactured according to Comparative Examples 1 to 11, the Rdc difference between the first coil and the second coil exceeds 1 mohm. In the case of Comparative Examples 1 to 11, the length difference between the first coil and the second coil is 0.5 mm, which is relatively large compared to 0.2 mm, while the difference between the cross-sectional area of ​​the first conductive wire and the cross-sectional area of ​​the second conductive wire is not relatively large, such as 30% (Comparative Example 1), 25% (Comparative Example 2), and 22% (Comparative Example 3), so the effect of improving the DC resistance is not significant.

[0213] While the disclosure has been described in connection with what are presently considered to be practical embodiments, it will be understood that the disclosure is not limited to the disclosed embodiments, but on the contrary, the disclosure is intended to cover various modifications and equivalents included within the spirit and scope of the appended claims.

[0214] <Description of symbols>

[0215] 1000, 2000, 3000, 4000: Coil electronics

[0216] 100: Magnetic body

[0217] 200, 4200: First coil

[0218] 201, 4201: first conductive line

[0219] 210: Winding Department

[0220] 220: Lead wire

[0221] 223: First lead portion

[0222] 225: Second lead portion

[0223] 230: First Core

[0224] 300, 4300: Second coil

[0225] 301, 4301: second conductive wire

[0226] 310: Winding

[0227] 320: Lead wire

[0228] 323: First lead portion

[0229] 325: Second lead portion

[0230] 330: Second core

[0231] 400: Middle layer

[0232] 500, 2500, 3500: First outer electrode

[0233] 600, 2600, 3600: Second outer electrode

[0234] 700, 2700, 3700: Third outer electrode

[0235] 800, 2800, 3800: Fourth outer electrode

[0236] 900: Insulation layer

[0237] IF: Insulating Film

[0238] R1: First Area

[0239] R2: The second area.

Claims

1. A coil electronic assembly, comprising: A first coil including at least one turn of a first conductive wire; a second coil including at least one turn of a second conductive wire; an intermediate layer disposed between the first coil and the second coil and having a first magnetic permeability; as well as a magnetic body surrounding the first coil, the second coil and the intermediate layer and having a second magnetic permeability different from the first magnetic permeability, The cross-sectional area of ​​the first conductive line is different from the cross-sectional area of ​​the second conductive line.

2. The coil electronic assembly according to claim 1, wherein: The length of the first conductive line is greater than the length of the second conductive line.

3. The coil electronic assembly according to claim 2, wherein: The cross-sectional area of ​​the first conductive line is greater than the cross-sectional area of ​​the second conductive line.

4. The coil electronic assembly according to claim 3, wherein: The average value of the difference between the length of the first conductive line and the length of the second conductive line is 0.2 mm. An average value of a ratio of a cross-sectional area of ​​the first conductive wire to a cross-sectional area of ​​the second conductive wire is 122% or more and 150% or less.

5. The coil electronic assembly according to claim 4, wherein: The average cross-sectional area of ​​the first conductive line is 0.0075 mm 2 or larger and 0.024mm 2 or smaller, The average cross-sectional area of ​​the second conductive line is 0.005 mm 2 or larger and 0.0184mm 2 or smaller.

6. The coil electronics assembly according to claim 4, wherein: An average value of a difference between a DC resistance of the first conductive line and a DC resistance of the second conductive line is 0.125 mohm or more and 0.651 mohm or less.

7. The coil electronics assembly according to claim 3, wherein: The average value of the difference between the length of the first conductive line and the length of the second conductive line is 0.5 mm. An average value of a ratio of a cross-sectional area of ​​the first conductive wire to a cross-sectional area of ​​the second conductive wire is 172% or more and 180% or less.

8. The coil electronics assembly according to claim 7, wherein: The average cross-sectional area of ​​the first conductive line is 0.009 mm 2 or larger and 0.0322mm 2 or smaller, The average cross-sectional area of ​​the second conductive line is 0.005 mm 2 or larger and 0.0184mm 2 or smaller.

9. The coil electronics assembly according to claim 7, wherein: An average value of a difference between a DC resistance of the first conductive line and a DC resistance of the second conductive line is 0.212 mohm or more and 0.432 mohm or less.

10. The coil electronics assembly according to claim 1, wherein: The cross-sectional shape of the first conductive wire is circular or elliptical, The cross-section of the second conductive wire is circular or elliptical.

11. The coil electronics assembly according to claim 1, wherein: The cross-sectional shape of the first conductive wire is a rectangular shape with rounded sides, and the cross-sectional shape of the second conductive wire is a rectangular shape with rounded sides, The average length of the major axis passing through the center of the cross section of the first conductive line is greater than the average length of the major axis passing through the center of the cross section of the second conductive line, An average length of a short axis intersecting the long axis at the center of a cross section of the first conductive wire is equal to an average length of a short axis intersecting the long axis at the center of a cross section of the second conductive wire.

12. The coil electronics assembly of claim 1, wherein: The cross-sections of the first conductive line and the second conductive line have a rectangular shape with rounded edges, The average length of the major axis passing through the center of the cross section of the first conductive line is equal to the average length of the major axis passing through the center of the cross section of the second conductive line, An average length of a minor axis intersecting the major axis at the center of a cross section of the first conductive line is greater than an average length of a minor axis intersecting the major axis at the center of a cross section of the second conductive line.

13. The coil electronics assembly of claim 1, wherein: The intermediate layer is in contact with the first coil and the second coil.

14. The coil electronics assembly of claim 13, wherein: The intermediate layer extends from a first region between a first core of the first coil and a second core of the second coil to a second region between the first coil and the second coil.

15. The coil electronics assembly of claim 14, wherein: The intermediate layer is in contact with an outer surface of the magnetic body.

16. The coil electronics assembly of claim 14, wherein: The thickness of the intermediate layer located in the first region is equal to the thickness of the intermediate layer located in the second region.

17. The coil electronics assembly of claim 14, wherein: The intermediate layer extends from the first region to a portion of the first core.

18. The coil electronics assembly of claim 14, wherein: The intermediate layer extends from the first region to a portion of the second core.

19. The coil electronics assembly of claim 14, wherein: The intermediate layer extends from the first region to a portion of the first core, and The intermediate layer extends from the first region to a portion of the second core.

20. The coil electronics assembly of claim 1, further comprising: a first external electrode disposed on the exterior of the magnetic body and connected to a first lead portion of the first coil; a second outer electrode disposed on the exterior of the magnetic body and connected to a second lead portion of the first coil; a third external electrode disposed on the exterior of the magnetic body and connected to the first lead portion of the second coil; as well as A fourth external electrode is provided on the outside of the magnetic body and connected to the second lead portion of the second coil.

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