Coil component

Abstract

The invention provides a coil assembly. The coil component includes: a main body; the first winding coil comprises a first coil part, a first lead-out part and a second lead-out part; the second winding coil comprises a second coil part, a third leading-out part and a fourth leading-out part; the coupling adjusting part comprises a first area and a second area, the winding axis of the first coil part and the winding axis of the second coil part penetrate through the first area, and the second area surrounds the first area in the transverse direction; a first external electrode and a second external electrode connected to the first lead-out portion and the second lead-out portion, respectively; and a third external electrode and a fourth external electrode connected to the third lead-out portion and the fourth lead-out portion, respectively, in which the first region and the second region respectively include a plurality of magnetic particles and an insulating material interposed between the plurality of magnetic particles, and the magnetic conductivity of the first region is different from that of the second region.

Description

[0001] This application claims the benefit of priority from Korean Patent Application No. 10-2023-0133449 filed on October 6, 2023, in the Korean Intellectual Property Office, and Korean Patent Application No. 10-2023-0181688 filed on December 14, 2023, in the Korean Intellectual Property Office, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present disclosure relates to a coil assembly. Background Art

[0003] As electronic devices such as digital TVs, mobile phones, and notebook computers become smaller and thinner, coil components used in electronic devices are also required to be smaller and thinner. In order to meet these requirements, research and development of various wound or film coil components are being actively carried out.

[0004] The main problem of miniaturization and slimming of coil components is to achieve miniaturization and slimming of products while also obtaining the same characteristics as conventional coil components. In order to meet these requirements, the proportion of magnetic material in the core filled with magnetic material should be increased, but depending on the strength and insulation of the main body of the inductor, there is a limit to increasing the above proportion due to changes in frequency characteristics, etc.

[0005] In addition, there is an increasing demand for arrayed coil components that have advantages such as reducing the installation area of ​​the coil component. The arrayed coil component may be determined as an uncoupled inductor, a coupled inductor, or a hybrid inductor according to the coupling coefficient or mutual inductance between the plurality of coils. In such an arrayed inductor, it is necessary to ensure the saturation current (I sat ) and other characteristics. Summary of the invention

[0006] According to one aspect of the present disclosure, a method can be provided for effectively achieving a target coupling coefficient and improving, for example, a saturation current (I sat ) and other characteristics of the coil component.

[0007] According to one aspect of the present disclosure, a coil component includes: a main body having an upper surface and a lower surface opposite to each other in a first direction and a side surface connecting the upper surface and the lower surface; a first winding coil, arranged in the main body and including a first coil portion having at least one turn and a first lead-out portion and a second lead-out portion extending from two ends of the first coil portion, respectively; a second winding coil, arranged in the main body, spaced apart from the first winding coil in the first direction, and including a second coil portion having at least one turn and a third lead-out portion and a fourth lead-out portion extending from two ends of the second coil portion, respectively; a coupling adjustment portion having a coupling adjustment portion arranged between the first winding coil and The portion between the second winding coil includes a first region and a second region, the winding axis of the first coil portion and the winding axis of the second coil portion pass through the first region, and the second region surrounds the first region in a lateral direction different from the first direction; a first external electrode and a second external electrode, connected to the first lead-out portion and the second lead-out portion, respectively; and a third external electrode and a fourth external electrode, connected to the third lead-out portion and the fourth lead-out portion, respectively, wherein the first region and the second region respectively include a plurality of magnetic particles and an insulating material between the plurality of magnetic particles, and the magnetic permeability of the first region is different from the magnetic permeability of the second region.

[0008] In an embodiment, the magnetic permeability of the first region may be higher than the magnetic permeability of the second region.

[0009] In an embodiment, a filling rate of the magnetic particles in the first region may be higher than a filling rate of the magnetic particles in the second region.

[0010] In an embodiment, a difference in D50 value between the magnetic particles in the first region and the magnetic particles in the second region may be less than or equal to 10%.

[0011] In an embodiment, the first region may include first magnetic particles having a diameter range of 5μm to 61μm, second magnetic particles having a diameter range of 0.9μm to 4.5μm, and third magnetic particles having a diameter range of 10nm to 800nm, and the second region may include first magnetic particles having a diameter range of 5μm to 61μm and second magnetic particles having a diameter range of 0.9μm to 4.5μm.

[0012] In embodiments, the first region may be integral with the body.

[0013] In an embodiment, the second region may cover at least a portion of a side surface of the first coil part.

[0014] In an embodiment, the second region may be spaced apart from a side surface of the first coil part.

[0015] In an embodiment, the second region may cover at least a portion of a side surface of the second coil part.

[0016] In an embodiment, the second region may be spaced apart from a side surface of the second coil part.

[0017] In an embodiment, the second region may cover at least a portion of a side surface of the first coil part and at least a portion of a side surface of the second coil part.

[0018] In an embodiment, the second region may be disposed outside the first coil portion and the second coil portion in the lateral direction.

[0019] In an embodiment, the second region may extend to the side surface of the body.

[0020] In an embodiment, the second region may be provided in a region where the first coil portion and the second coil portion overlap in the first direction.

[0021] In an embodiment, the second region may protrude from inner surfaces of the first coil portion and the second coil portion toward a winding axis of the first coil portion and the second coil portion.

[0022] In an embodiment, in a cross section parallel to the first direction, an aspect ratio of the first coil portion and the second coil portion may be less than 1.

[0023] In an embodiment, in a cross section parallel to the first direction, an aspect ratio of the first coil portion and the second coil portion may be greater than or equal to 1.

[0024] In an embodiment, in a cross section parallel to the first direction, the conductive wire forming the first coil part and the second coil part may be circular.

[0025] In an embodiment, in a cross section parallel to the first direction, the conductive wires forming the first coil part and the second coil part may be rectangular.

[0026] In an embodiment, in a cross section parallel to the first direction, a portion of the first coil part and the second coil part may have a cross-sectional shape inclined to the left or to the right with respect to the first direction.

[0027] In an embodiment, the second region may be spaced apart from the first coil portion and the second coil portion.

[0028] In an embodiment, the body may include a molding portion, the first wire wound coil and the second wire wound coil may be disposed in the molding portion and the molding portion may protrude toward the upper surface of the body.

[0029] In an embodiment, the molded portion may include a base and a core, the second winding coil may be directly disposed on the base, the core protrudes from the base and penetrates central portions of the first coil portion and the second coil portion, and a gap between the core and the upper surface of the main body may be narrower than a gap between the first coil portion and the upper surface of the main body.

[0030] According to one aspect of the present disclosure, a coil component includes: a main body having an upper surface and a lower surface opposite to each other in a first direction and a side surface connecting the upper surface and the lower surface; a first winding coil, arranged in the main body and including a first coil portion having at least one turn and a first lead-out portion and a second lead-out portion extending from two ends of the first coil portion, respectively; a second winding coil, arranged in the main body, spaced apart from the first winding coil in the first direction, and including a second coil portion having at least one turn and a third lead-out portion and a fourth lead-out portion extending from two ends of the second coil portion, respectively; a coupling adjustment portion having a first winding portion and a second lead-out portion arranged in the first winding portion. The portion between the wire coil and the second winding coil includes a first region and a second region, the winding axis of the first coil portion and the winding axis of the second coil portion pass through the first region, and the second region surrounds the first region in a lateral direction different from the first direction; a first external electrode and a second external electrode, connected to the first lead-out portion and the second lead-out portion, respectively; and a third external electrode and a fourth external electrode, connected to the third lead-out portion and the fourth lead-out portion, respectively, wherein the first region and the second region include magnetic particles, and the filling rate of the magnetic particles in the first region is different from the filling rate of the magnetic particles in the second region.

[0031] In an embodiment, a filling rate of the magnetic particles in the first region may be higher than a filling rate of the magnetic particles in the second region.

[0032] In an embodiment, the number of types of the magnetic particles included in the first region may be greater than the number of types of the magnetic particles included in the second region.

[0033] In embodiments, the first region may be integral with the body.

[0034] In an embodiment, the second region may cover at least a portion of a side surface of the first coil part and at least a portion of a side surface of the second coil part.

[0035] In an embodiment, the second region may be disposed outside the first coil portion and the second coil portion in the lateral direction.

[0036] In an embodiment, the second region may protrude from inner surfaces of the first coil portion and the second coil portion toward the winding axis of the first coil portion and the second coil portion.

[0037] According to one aspect of the present disclosure, a coil component includes: a main body having an upper surface and a lower surface opposite to each other in a first direction and a side surface connecting the upper surface and the lower surface; a first winding coil, arranged in the main body, and including a first coil portion having at least one turn and a first lead-out portion and a second lead-out portion respectively extending from two ends of the first coil portion; a second winding coil, arranged in the main body, spaced apart from the first winding coil in the first direction, and including a second coil portion having at least one turn and a third lead-out portion and a fourth lead-out portion respectively extending from two ends of the second coil portion; a coupling adjustment portion having a first winding coil and a second winding coil disposed in the main body, and a third winding coil and a fourth winding coil disposed in the first winding coil. The portion between the coil and the second winding coil, and includes a first region and a second region, the winding axis of the first coil portion and the winding axis of the second coil portion passing through the first region, and the second region surrounding the first region in a lateral direction different from the first direction; a first external electrode and a second external electrode, connected to the first lead-out portion and the second lead-out portion, respectively; and a third external electrode and a fourth external electrode, connected to the third lead-out portion and the fourth lead-out portion, respectively, wherein the coupling adjustment portion includes an Fe-based alloy, and the composition of the Fe-based alloy included in the first region is different from the composition of the Fe-based alloy included in the second region.

[0038] In an embodiment, an amount of Fe included in the Fe-based alloy in the first region may be higher than an amount of Fe included in the Fe-based alloy in the second region.

[0039] In an embodiment, the Fe-based alloy may be a Fe—Si-based alloy, and an amount of Si included in the Fe—Si-based alloy in the first region may be higher than an amount of Si included in the Fe—Si-based alloy in the second region.

[0040] In an embodiment, the amount of Si contained in the Fe—Si based alloy in the first region may be greater than or equal to 6.5 wt %, and the amount of Si contained in the Fe—Si based alloy in the second region may be less than 6.5 wt %.

[0041] In an embodiment, the amount of Si included in the Fe—Si based alloy in the second region may be greater than or equal to 1 wt % and less than or equal to 5 wt %.

[0042] According to one aspect of the present disclosure, a coil component includes: a main body; a first winding coil, arranged in the main body, and including a first coil portion having at least one turn and a first lead-out portion and a second lead-out portion extending from two ends of the first coil portion, respectively; a second winding coil, arranged in the main body, spaced apart from the first winding coil in a first direction, and including a second coil portion having at least one turn and a third lead-out portion and a fourth lead-out portion extending from two ends of the second coil portion, respectively; a coupling adjustment portion, having a portion arranged between the first winding coil and the second winding coil, and including a first area and a second area, the winding axis of the first coil portion and the winding axis of the second coil portion passing through the first area, and the second area surrounding the first area in a lateral direction different from the first direction; a first external electrode and a second external electrode, connected to the first lead-out portion and the second lead-out portion, respectively; and a third external electrode and a fourth external electrode, connected to the third lead-out portion and the fourth lead-out portion, respectively, wherein the first area and the second area include magnetic particles, and the number of types of magnetic particles included in the first area is greater than the number of types of magnetic particles included in the second area.

[0043] In one embodiment, the magnetic permeability of the first region may be higher than the magnetic permeability of the second region.

[0044] In one embodiment, the filling rate of the magnetic particles in the first region may be higher than the filling rate of the magnetic particles in the second region.

[0045] According to one aspect of the present disclosure, a coil component includes: a magnetic body; a first winding coil, arranged in the magnetic body, and including a first coil portion having at least one turn and a first lead-out portion and a second lead-out portion extending from two ends of the first coil portion, respectively; a second winding coil, arranged in the magnetic body, spaced apart from the first winding coil in a first direction, and including a second coil portion having at least one turn and a third lead-out portion and a fourth lead-out portion extending from two ends of the second coil portion, respectively; a first external electrode and a second external electrode, connected to the first lead-out portion and the second lead-out portion, respectively; and a third external electrode and a fourth external electrode, connected to the third lead-out portion and the fourth lead-out portion, respectively, wherein the magnetic permeability of the magnetic body in a central area passed by the winding axis of the first coil portion and the winding axis of the second coil portion is greater than the magnetic permeability in at least one of the gap area between the first winding coil and the second winding coil in the first direction and the outer area of ​​the first winding coil and the second winding coil in a lateral direction different from the first direction.

[0046] In one embodiment, the magnetic body may include a plurality of magnetic particles, and a filling rate of the magnetic particles in the central region may be higher than a filling rate of the magnetic particles in at least one of the gap region and the outer region.

[0047] In one embodiment, the magnetic permeability in the central region may be greater than the magnetic permeability in the gap region.

[0048] In one embodiment, the magnetic permeability of the central region may be greater than the magnetic permeability of the outer region.

[0049] In one embodiment, the magnetic permeability in the central region may be greater than the magnetic permeability of the gap region and the magnetic permeability of the outer region. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The above and other aspects, features and advantages of the present disclosure will be more clearly understood through the following detailed description in conjunction with the accompanying drawings, in which: Figure 1 is a transparent perspective view schematically illustrating a coil component according to a first embodiment of the present disclosure.

[0051] Figure 2 yes Figure 1 An exploded perspective view of the coil and coupling adjustment portion in the coil assembly.

[0052] Figure 3 yes Figure 1 Cross-sectional view of the coil assembly.

[0053] Figure 4 is an enlarged cross-sectional view of a first region of the coupling adjustment portion.

[0054] Figure 5 is an enlarged cross-sectional view of the second region of the coupling adjustment portion.

[0055] Figure 6 is an enlarged cross-sectional view of a first region of a coupling adjustment portion in a modified example.

[0056] Figure 7 is an enlarged cross-sectional view of a first region of a coupling adjustment portion in a modified example.

[0057] Figure 8 is an enlarged cross-sectional view of the second region of the coupling adjustment portion in the modified example.

[0058] Figures 9 to 20 A coil assembly according to a modified example is shown.

[0059] Figure 21 to Figure 24 An exemplary method for manufacturing a coil assembly is shown. DETAILED DESCRIPTION

[0060] Hereinafter, embodiments of the present disclosure will be described with reference to specific embodiments and the accompanying drawings. However, embodiments of the present disclosure may be modified to have various other forms, and the scope of the present disclosure is not limited to the embodiments described below. In addition, embodiments of the present disclosure may be provided to more completely explain the present disclosure to those skilled in the art. Therefore, in order to describe more clearly, the shapes and sizes of the components in the accompanying drawings may be exaggerated, and the components indicated by the same reference numerals in the accompanying drawings may be the same components.

[0061] Various types of electronic components can be used in electronic devices, and various types of coil components can be appropriately used in these electronic components for purposes such as noise removal. In other words, the coil components in electronic devices can be used as power inductors, high-frequency inductors, general-purpose magnetic beads, GHz magnetic beads, common mode filters, etc.

[0062] Figure 1 is a transparent perspective view schematically illustrating a coil component according to a first embodiment of the present disclosure. Figure 2 yes Figure 1 An exploded perspective view of the coil and coupling adjustment portion in the coil assembly. Figure 3 yes Figure 1 Cross-sectional view of the coil assembly.

[0063] exist Figure 1 and Figure 2 , the coating CL on the surfaces of the first and second wire wound coils 121 and 122 applicable to the first embodiment will be omitted to more clearly illustrate the coupling between the components.

[0064] Reference Figures 1 to 3 The coil component 100 according to the first embodiment may include a body 110, a first winding coil 121, a second winding coil 122, a coupling adjustment portion 130, and a first external electrode 141, a second external electrode 142, a third external electrode 143, and a fourth external electrode 144, and may be implemented as an array inductor in which the first winding coil 121 and the second winding coil 122 are magnetically coupled. In this case, the coupling adjustment portion 130 may include a first region R1 and a second region R2 surrounding the first region R1 in a lateral direction (e.g., D2), and the first region R1 and the second region R2 may be implemented to have different magnetic permeabilities, and the coupling degree of the first winding coil 121 and the second winding coil 122 may be appropriately adjusted. The details thereof will be described later, and hereinafter, the main elements constituting the coil component 100 of the first embodiment will be explained.

[0065] The main body 110 may have a first winding coil 121 and a second winding coil 122 disposed therein, and may form an overall appearance of the coil component 100. In this case, the main body 110 may include an upper surface and a lower surface relative to each other in the first direction D1, and a plurality of side surfaces connecting the upper surface and the lower surface. The main body 110 may include an insulating resin and a magnetic material. Specifically, the main body 110 may be formed by stacking one or more magnetic composite sheets in which a magnetic material is dispersed in an insulating resin. The magnetic material may be ferrite or metal magnetic powder particles. Examples of ferrites may include one or more 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 ferrites (such as Y-based ferrites, etc.), and Li-based ferrites. The metal magnetic powder particles may include one or more selected from the group consisting of iron (Fe), chromium (Cr), cobalt (Co), molybdenum (Mo), aluminum (Al), niobium (Nb), copper (Cu), and nickel (Ni). The metal magnetic powder particles may also include silicon (Si). For example, the metal magnetic powder particles may be one or more of pure iron powder, Fe-Si-based alloy powder, Fe-Si-Al-based alloy powder, Fe-Ni-based alloy powder, Fe-Ni-Mo-based alloy powder, Fe-Ni-Mo-Cu-based alloy powder, Fe-Co-based alloy powder, Fe-Ni-Co-based alloy powder, Fe-Cr-based alloy powder, Fe-Cr-Si-based alloy powder, Fe-Si-Cu-Nb-based alloy powder, Fe-Ni-Cr-based alloy powder, and Fe-Cr-Al-based alloy powder. The metal magnetic powder particles may be amorphous or crystalline. For example, the metal magnetic powder particles may be Fe-Si-B-Cr-based amorphous alloy powder particles, but the present disclosure is not limited thereto. The ferrite and the metal magnetic powder particles may have an average diameter of about 0.1 μm to 30 μm, respectively, but are not limited thereto. The body 110 may include two or more types of magnetic materials dispersed in the resin. In this case, the term "different types of magnetic materials" means that the magnetic materials dispersed in the resin can be distinguished from each other by at least one of the average diameter, composition, crystallinity, or shape. The insulating resin may include epoxy resin, polyimide, liquid crystal polymer, etc., in a single form or in a combined form, but the present disclosure is not limited thereto.

[0066] Will refer to Figure 21 to Figure 24 An example of a method for manufacturing a coil component is described. First, a composite material including a magnetic material and an insulating resin may be filled into a mold having an inverted T-shaped cross section, and then heated and pressed to form a body 110 such as Fig.21 The lower region 110T shown. The lower region 110T of the body 110 formed in this manner may have an inverted T-shape with a central portion protruding in an upward direction, which may include a first region R1, and the second winding coil 122 may be arranged so that the winding axis passes through the protruding region as described above. Thereafter, the magnetic particles P may be coated onto the second winding coil 122 using an inkjet, dispensing process, or the like to obtain a coupling adjustment portion having magnetic properties different from those of the lower region 110T including the first region R1. In this case, the insulating material I may be interposed between the magnetic particles P, and may further contain a solvent, etc. as required. As Fig. 22 As shown, after the magnetic particles P are arranged, a mold 200A (such as Fig.21 The coupling adjustment part is pressed and molded as shown in FIG. 1 , so that the second region R2 of the coupling adjustment part can be obtained. Thereafter, the first winding coil 121 can be arranged on the second region R2. Next, as shown in FIG. Fig.23 As shown, the magnetic particles P may be coated onto the first winding coil 121 using an inkjet, dispensing process, or the like. In this case, the insulating material I may be interposed between the magnetic particles P, and may further contain a solvent, etc. as required. Fig.24 As shown, after the magnetic particles P are arranged, a mold 200B (such as Fig.23 Magnetic particles P and insulating material I are pressed and molded to obtain the upper region 110C of the body. By using this manufacturing method, a coupling adjustment portion having first and second regions R1 and R2 with different magnetic properties can be efficiently formed between the first winding coil 121 and the second winding coil 122.

[0067] As another example of a manufacturing method, the main body 110 may be formed using a lamination method. Specifically, a plurality of unit laminates for manufacturing the main body 110 may be prepared, and the plurality of unit laminates may be laminated on the upper and lower portions of the first winding coil 121 and the second winding coil 122. In this case, the unit laminate may be prepared as a sheet type by mixing magnetic particles (such as metals, etc.) and organic materials (such as thermosetting resins, adhesives, solvents, etc.) to form a slurry, applying the slurry to a carrier film to a thickness of tens of μm by a doctor blade method, and drying it. Therefore, the unit laminate may be manufactured in the form of magnetic particles dispersed in a thermosetting resin (such as epoxy resin, polyimide, etc.).

[0068] Refer again Figures 1 to 3, the first winding coil 121 may be disposed in the main body 110, and may include a first coil portion 121C and a first lead portion 121A and a second lead portion 121B, the first coil portion 121C having at least one turn based on the first direction D1 as the winding axis, and the first lead portion 121A and the second lead portion 121B respectively extending from both ends of the first coil portion 121C. In addition, the second winding coil 122 may be spaced apart from the first winding coil 121 in the main body 110 in the first direction D1, and may include a second coil portion 122C and a third lead portion 122A and a fourth lead portion 122B, the second coil portion 122C having at least one turn based on the first direction D1 as the winding axis, and the third lead portion 122A and the fourth lead portion 122B respectively extending from both ends of the second coil portion 122C.

[0069] The first coil portion 121C and the second coil portion 122C may form turns wound in the same direction. In addition, the first lead-out portion 121A and the second lead-out portion 121B may be led out to one side surface of the main body 110, and the third lead-out portion 122A and the fourth lead-out portion 122B may be led out to the other side surface of the main body 110. In this case, one side surface of the main body 110 from which the first lead-out portion 121A and the second lead-out portion 121B are led out may be opposite to the other side surface of the main body 110 from which the third lead-out portion 122A and the fourth lead-out portion 122B are led out.

[0070] Reference Figure 3 , the first and second wound coils 121 and 122 may be formed by winding a conductive metal, and the coating layer CL may be provided on the surface of the remaining portion except for the portion contacting the first to fourth external electrodes 141 to 144. The coating layer CL may include a known material having an insulating property, and may include, for example, a thermoplastic resin (such as a polystyrene-based resin, a vinyl acetate-based resin, a polyester-based resin, a polyethylene-based resin, a polypropylene-based resin, a polyamide-based resin, a rubber-based resin, an acrylic-based resin, etc.), a thermosetting resin (such as a phenol-based resin, an epoxy-based resin, a polyurethane-based resin, a melamine-based resin, an alkyd-based resin, etc.), a photosensitive resin, polyparaxylene, SiO x or SiN x .

[0071] Reference Figure 3 The first coil portion 121C and the second coil portion 122C of the first embodiment may be formed by winding a rectangular wire having a rectangular cross-section, and in the D1-D2 cross-section, the aspect ratio (T1 / W1) may be less than 1, and the aspect ratio (T1 / W1) may be the ratio of the thickness T1 of the first coil portion 121C and the second coil portion 122C to the line width W1.

[0072] The line width W1 of the first coil portion 121C and the second coil portion 122C may refer to an optical microscope image or a scanning electron microscope (SEM) image of a D1-D2 cross section taken from the central portion of the coil component 100 along the third direction D3, and the arithmetic mean of at least three of the plurality of line segments that are parallel to the second direction D2 and connect the two outermost boundary lines of each turn of the first coil portion 121C and the second coil portion 122C shown in the image in the second direction D2 and are spaced apart from each other in the first direction D1. In this case, the plurality of line segments parallel to the second direction D2 may be equally spaced apart from each other in the first direction D1, but the scope of the present disclosure is not limited thereto.

[0073] The thickness T1 of the first coil portion 121C and the second coil portion 122C may refer to an arithmetic mean of at least three of a plurality of line segments that are parallel to the first direction D1 and connect the two outermost boundary lines of each turn of the first coil portion 121C and the second coil portion 122C shown in the image in the first direction D1 and are spaced apart from each other in the second direction D2, based on an optical microscope image or a scanning electron microscope (SEM) image of a D1-D2 cross section taken from a central portion of the coil component 100 in the third direction D3. In this case, the plurality of line segments parallel to the first direction D1 may be equally spaced apart from each other in the second direction D2, but the scope of the present disclosure is not limited thereto.

[0074] Examples of materials constituting the first and second winding coils 121 and 122 may include conductive materials such as copper (Cu), aluminum (Al), silver (Ag), tin (Sn), gold (Au), nickel (Ni), lead (Pb), titanium (Ti), chromium (Cr), and alloys thereof, but are not limited thereto.

[0075] The first external electrode 141 and the second external electrode 142 may be connected to the first winding coil 121, and specifically, may be connected to the first lead-out portion 121A and the second lead-out portion 121B, respectively. The third external electrode 143 and the fourth external electrode 144 may be connected to the second winding coil 122, and specifically, may be connected to the third lead-out portion 122A and the fourth lead-out portion 122B, respectively. In this case, the first external electrode 141 and the second external electrode 142 may be disposed on the same side surface of the body 110 and may extend to the lower surface of the body 110, and similarly, the third external electrode 143 and the fourth external electrode 144 may be disposed on the same side surface of the body 110 and may extend to the lower surface of the body 110.

[0076] The first to fourth external electrodes 141 to 144 may be formed using a paste containing a metal having excellent conductivity, and the paste may be, for example, a conductive paste containing nickel (Ni), copper (Cu), tin (Sn), or silver (Ag) alone or a conductive paste containing an alloy thereof, etc. In addition, a plating layer may be provided to cover each of the first to fourth external electrodes 141 to 144. In this case, the plating layer may include one or more selected from the group consisting of nickel (Ni), copper (Cu), and tin (Sn), and, for example, a nickel (Ni) layer and a tin (Sn) layer may be sequentially formed.

[0077] Reference Figures 1 to 3 The coupling adjustment part 130 may be disposed between the first winding coil 121 and the second winding coil 122, and may have a first region R1 and a second region R2 having different magnetic permeabilities from each other. Each of the first region R1 and the second region R2 may include a plurality of magnetic particles and an insulating material between the plurality of magnetic particles, and the magnetic permeability of the first region R1 may be higher than that of the second region R2.

[0078] In the coupling adjustment portion 130, the first region R1 may correspond to a region through which the winding axes of the first coil portion 121C and the second coil portion 122C pass, and the second region R2 may be arranged in a region where the first coil portion 121C and the second coil portion 122C overlap with each other in the first direction D1 and in a region outside the first coil portion 121C and the second coil portion 122C.

[0079] The first coil portion 121C and the second coil portion 122C may form a magnetic flux path ( Figure 3 ). The second region R2 may be located in at least a portion of a region surrounding the first region R1 in the lateral direction (eg, D2) and have a different magnetic permeability from the first region R1. At least a portion of the second region R2 may be located in a leakage flux path ( Figure 3). In this way, the magnetic permeabilities of the first region R1 and the second region R2, which are respectively located in the coupling magnetic flux path and the leakage magnetic flux path, can be changed to effectively control the coupling coefficient of the first winding coil 121 and the second winding coil 122. For example, when the target of the coupling coefficient of the first winding coil 121 and the second winding coil 122 is based on an absolute value greater than or equal to 0.495 and less than 0.605, it may not be easy to adjust the coupling coefficient by accurately controlling the gap between the first winding coil 121 and the second winding coil 122, the magnetic material of the main body 110, etc. Therefore, in the present disclosure, the coupling adjustment portion 130 may be disposed between the first winding coil 121 and the second winding coil 122 to achieve the target coupling coefficient value without making the gap between the first winding coil 121 and the second winding coil 122 too far from each other or too close to each other.

[0080] As a specific example, the second region R2 may have a lower magnetic permeability than the first region R1. In one embodiment, the first region R1 may form an integral structure with the body 110. In another embodiment, the first region R1 may be manufactured separately from the body 110 and may be formed of magnetic particles having different types or sizes. As in the first embodiment, by setting the magnetic permeability of the second region R2 to be relatively low, the magnitude of the leakage magnetic flux may be reduced without excessively reducing the gap between the first coil portion 121C and the second coil portion 122C, thereby also achieving a reduction in the saturation current (I sat ) effect. Here, the first region R1 may have a relatively high magnetic permeability. If the magnetic permeability of the first region R1 is reduced to a level close to that of the magnetic permeability of the second region R2, the amplitude of the coupling magnetic flux will be reduced. Therefore, in order to compensate for this reduction in the amplitude of the coupling magnetic flux, it may be necessary to increase the number of turns of the first coil portion 121C and the second coil portion 122C or reduce the gap between them. As in the first embodiment, the first region R1 may be set to have a relatively high level of magnetic permeability, which can fully ensure the amplitude of the coupling magnetic flux without increasing the number of turns of the first coil portion 121C and the second coil portion 122C or excessively reducing the gap between them, and thereby effectively achieving the target coupling coefficient.

[0081] When describing the specific form of the coupling adjustment portion 130, first, as in the first embodiment, the first coil portion 121C and the second coil portion 122C may be respectively disposed on the first surface and the second surface (corresponding to the upper surface and the lower surface, respectively, based on the drawings) of the second region R2 of the coupling adjustment portion 130 that are opposite to each other. In this case, the first winding coil 121 and the second winding coil 122 may be supported by the coupling adjustment portion 130. In addition, the second region R2 of the coupling adjustment portion 130 may extend to the side surface of the body 110. Therefore, the second region R2 may be disposed outside the first coil portion 121C and the second coil portion 122C in the lateral direction (e.g., D2). In this way, the second region R2 having a relatively low magnetic permeability in the coupling adjustment portion 130 may be disposed in the region corresponding to the space between the first coil portion 121C and the second coil portion 122C and in the outer region of the first coil portion 121C and the second coil portion 122C in the lateral direction, and the magnitude of the leakage magnetic flux of the first winding coil 121 and the second winding coil 122 may be effectively reduced.

[0082] In the coupling adjustment part 130 according to one embodiment, the magnetic permeability of the first region R1 may be different from the magnetic permeability of the second region R2. For example, the magnetic permeability of the second region R2 may be lower than the magnetic permeability of the first region R1. When it is difficult to measure the magnetic permeability of each region in the state of the coil component 100, the type, particle size, filling rate, etc. of the magnetic material included in the first region R1 and the second region R2 may be analyzed to compare their magnetic permeabilities. Hereinafter, reference will be made to Figures 4 to 8 A configuration in which the magnetic permeability of the first region R1 and the magnetic permeability of the second region R2 are adjusted is described, and the filling rate of the magnetic particles in the second region R2 may be adjusted to be lower than the filling rate of the magnetic particles in the first region R1.

[0083] Figure 4 is an enlarged cross-sectional view of a first region of the coupling adjustment portion. Figure 5 is an enlarged cross-sectional view of the second region of the coupling adjustment portion. Figure 6 is an enlarged cross-sectional view of a first region of a coupling adjustment portion in a modified example. Figure 7 is an enlarged cross-sectional view of a first region of a coupling adjustment portion in a modified example. Figure 8 is an enlarged cross-sectional view of the second region of the coupling adjustment portion in the modified example.

[0084] First, refer to Figure 4 and Figure 5, the first region R1 may include magnetic particles P11, and an insulating material 131 such as a resin may be interposed between the magnetic particles P11. Similarly, the second region R2 may include magnetic particles P21, and an insulating material 132 such as a resin may be interposed between the magnetic particles P21. As shown in the figure, the filling rate of the magnetic particles P11 in the first region R1 may be higher than the filling rate of the magnetic particles P21 in the second region R2. As an example of a method of obtaining the filling rate, after obtaining SEM images of the first region R1 and the second region R2, the ratio of the area occupied by the magnetic particles (P11 or P21) to the total area may be calculated. In this case, in order to obtain a more accurate value, the value of the filling rate may be obtained from a plurality of cross sections, and an average value may be obtained therefrom.

[0085] When the sizes of the magnetic particles P11 and P21 in the first region R1 and the second region R2 may not be significantly different, for example, when the difference between the D50 of the magnetic particles P11 in the first region R1 and the D50 of the magnetic particles P21 in the second region R2 is less than or equal to 10%, the filling rate of the magnetic particles P11 and P21 may affect the magnetic permeability in the region corresponding thereto. In this case, the difference in D50 of less than or equal to 10% means that the ratio of the difference between the large value and the small value of D50 relative to the large value of D50 is less than or equal to 10%. As an example, the magnetic particles P11 included in the first region R1 may have a diameter range of 5μm to 61μm, and similarly, the magnetic particles P21 included in the second region R2 may have a diameter range of 5μm to 61μm.

[0086] In order to increase the filling rate of the magnetic particles, magnetic particles having different particle size distributions may be used. For example, the first region R1 may include two or more kinds of magnetic particles having different sizes of D50. Figure 6 An example using two particles (P11 and P12) is shown, and Figure 7 An example using three types of particles (P11, P12, and P13) is shown. Figure 8 An example is illustrated in which the second region R2 includes two types of magnetic particles P21 and P22 having different sizes of D50.

[0087] Regarding the number of types of magnetic particles with respect to the size difference of D50, the number of types of magnetic particles of the second region R2 may be less than the number of types of magnetic particles of the first region R1. As a non-limiting example, the first region R1 may include two or more types of magnetic particles (P11 and P12) of different sizes, and the second region R2 may include a single type of magnetic particles (P21). As another example, the first region R1 may include three or more types of magnetic particles of different sizes (P11, P12, and P13), and the second region R2 may include two or fewer types of magnetic particles of different sizes (P21 and P22).

[0088] Therefore, a plurality of magnetic particles having different sizes D50 may be used to improve the filling rate of the magnetic particles, and thus the magnetic permeability of the region corresponding thereto may be increased. In this case, in the first region R1, the first magnetic particles P11 may have a diameter range of 5 μm to 61 μm, the second magnetic particles P12 may have a diameter range of 0.9 μm to 4.5 μm, and the third magnetic particles P13 may have a diameter range of 10 nm to 800 nm. In addition, in the second region R2, the first magnetic particles P21 may have a diameter range of 5 μm to 61 μm, and the second magnetic particles P22 may have a diameter range of 0.9 μm to 4.5 μm.

[0089] Unlike the above embodiment, the first region R1 may include three types of magnetic particles, and the second region R2 may include one type of magnetic particles. As another example, the first region R1 may include two types of magnetic particles, and the second region R2 may include one type of magnetic particles.

[0090] The diameters of the magnetic particles (P11 to P13, P21, and P22) present in the coupling adjustment portion 130 may be measured from a cross section of the coupling adjustment portion 130. Specifically, after photographing a plurality of regions (e.g., 5 or 10 regions) equally spaced in the first direction D1 or the third direction D3 with respect to a D1-D3 cross section of the body 110 passing through the center of the body 110 in the second direction D2 using a scanning electron microscope (SEM), the diameters of the magnetic particles (P11 to P13, P21, and P22) may be obtained using an analysis program. In this case, as a specific example, the image pixel size in the SEM image may be fixed to 10 nm. 10nm, and the working distance can be fixed to 8mm. Backscattering mode can be used. Then, the average value of the diameter can be calculated using an image analysis program (e.g., a deep learning tool from ORS). The magnetic particles (P11 to P13, P21, and P22) may have a spherical shape or a substantially spherical shape, but are not limited thereto. For example, the magnetic particles (P11 to P13, P21, and P22) may have a non-spherical shape. Non-spherical magnetic particles can be obtained when the sphericity of the magnetic particles (P11 to P13, P21, and P22) is reduced during the oxidation process. When the magnetic particles (P11 to P13, P21, and P22) have any shape that does not maintain a spherical shape, the above diameter can be interpreted as being replaced by a Feret diameter, and the average value of the diameter can also be interpreted as being replaced by an average value of a Feret diameter. As a method for calculating the average diameter value, a tool in an image processing software can be used, and a size distribution can be obtained by particle size analysis of each region. In the above description, the diameter of the magnetic particles (P11 to P13, P21 and P22) can be measured by cutting multiple cross sections from the main body 110, but when it is difficult to cut multiple cross sections, the diameter of the magnetic particles can also be measured on a cross section passing through the center of the main body 110 (for example, D1-D3 cross section, D1-D2 cross section, etc.).

[0091] In the above-described embodiment, the magnetic permeability in each region of the coupling adjustment portion 130 is adjusted by adjusting the filling rate of the magnetic particles in each region of the coupling adjustment portion 130. In contrast, the first region R1 and the second region R2 may have different materials constituting the magnetic particles, and thus the magnetic permeability may be adjusted. Specifically, the coupling adjustment portion 130 may include an Fe-based alloy, and, in this case, the Fe-based alloy included in the first region R1 and the Fe-based alloy included in the second region R2 may have different compositions. In this case, the Fe amount of the Fe-based alloy included in the first region R1 may be higher than the Fe amount of the Fe-based alloy included in the second region R2, and the Fe amount may be wt%. In addition, considering that Si also affects the magnetic permeability in addition to Fe, the Si amount may also be adjusted together with Fe or alone. For example, the Fe-based alloy included in the coupling adjustment portion 130 may be an Fe-Si-based alloy, and the Si amount of the Fe-Si-based alloy included in the first region R1 may be higher than the Si amount of the Fe-Si-based alloy included in the second region R2. Specifically, the amount of Si in the Fe-Si based alloy contained in the first region R1 may be greater than or equal to 6.5wt%, and the amount of Si in the Fe-Si based alloy contained in the second region R2 may be less than 6.5wt%. More specifically, the amount of Si in the Fe-Si based alloy contained in the second region R2 may be greater than or equal to 1wt% and less than or equal to 5wt%. In addition, when the Fe-based alloy included in the first region R1 and the Fe-based alloy included in the second region R2 have different compositions, the types of elements included therein may be different. For example, the elements included in the Fe-based alloy of the first region R1 may not be included in the Fe-based alloy of the second region R2, and vice versa.

[0092] Unlike the previous embodiment, the second region R2 in the coupling adjustment portion 130 may be formed of a sheet instead of magnetic particles. For example, the second region R2 may include a magnetic sheet, and in this case, the magnetic sheet may include ferrite. In this case, the first region R1 may include magnetic particles formed of an Fe-based alloy having a relatively higher magnetic permeability than ferrite.

[0093] The area where the coupling adjustment portion 130 is formed may be changed according to the desired coupling coefficient size or other characteristics, and this will refer to Figures 9 to 15 First, as in Fig. 9In a modified example of the coupling adjustment portion 130, the second region R2 may be implemented as a configuration surrounded by the body 110 in the lateral direction. In this case, the second region R2 may be limitedly formed in a region where the first coil portion 121C and the second coil portion 122C overlap in the first direction D1, and may not be formed outside the first coil portion 121C and the second coil portion 122C in the lateral direction. When the coupling adjustment portion 130 has such an arrangement, the amplitude of the coupling magnetic flux of the first winding coil 121 and the second winding coil 122 outside the first coil portion 121C and the second coil portion 122C may be increased.

[0094] Then, as in Fig.10 In a modified example, the coupling adjustment portion 130 may have a configuration in which the first region R1 is extended. For example, the first region R1 may extend into a region where the first coil portion 121C and the second coil portion 122C overlap in the first direction D1. In this case, the second region R2 may be limited to the outside of the region where the first coil portion 121C and the second coil portion 122C overlap in the first direction D1.

[0095] Next, refer to Fig.11 , the second region R2 of the coupling adjustment portion 130 may be arranged to cover at least a portion of the side surface (e.g., the outer side surface) of the first coil portion 121C. In addition, the second region R2 of the coupling adjustment portion 130 may be arranged to be spaced apart from the side surface of the second coil portion 122C. When the coupling adjustment portion 130 has such an arrangement, by reducing the leakage magnetic flux circulating around the outer side of the first coil portion 121C, it is possible to finely adjust to be close to a desired coupling coefficient.

[0096] Next, refer to Fig.12 , the second region R2 of the coupling adjustment portion 130 may be arranged to cover at least a portion of the side surface (e.g., the outer side surface) of the second coil portion 122C. In addition, the second region R2 of the coupling adjustment portion 130 may be arranged to be spaced apart from the side surface of the first coil portion 121C. When the coupling adjustment portion 130 has such an arrangement, by reducing the leakage magnetic flux circulating around the outer side of the second coil portion 122C, it is possible to finely adjust to be close to the desired coupling coefficient.

[0097] Next, refer to Fig.13, the second region R2 of the coupling adjustment portion 130 may be arranged to cover at least a portion of the side surface (e.g., the outer side surface) of the first coil portion 121C and at least a portion of the side surface (e.g., the outer side surface) of the second coil portion 122C. For example, the second region R2 of the coupling adjustment portion 130 may extend along the side surfaces of the first coil portion 121C and the second coil portion 122C toward the upper surface or the lower surface of the body 110 in an area outside the first coil portion 121C and the second coil portion 122C. When the coupling adjustment portion 130 has such an arrangement, by reducing the leakage magnetic flux circulating around the outer sides of the first coil portion 121C and the second coil portion 122C, the coupling coefficient can be finely adjusted to be close to the desired one.

[0098] Next, refer to Fig.14 , the second region R2 of the coupling adjustment portion 130 may be arranged to protrude inwardly from the inner surface of the first coil portion 121C and the second coil portion 122C toward the winding axis of the first coil portion 121C and the second coil portion 122C. For example, the second region R2 of the coupling adjustment portion 130 may be implemented to partially extend in the direction toward the center core of the first coil portion 121C and the second coil portion 122C. When the coupling adjustment portion 130 has such an arrangement, by reducing the leakage magnetic flux flowing between the first coil portion 121C and the second coil portion 122C, it can be finely adjusted to be close to the desired coupling coefficient.

[0099] Reference Fig.15 , the second region R2 of the coupling adjustment portion 130 may be arranged to be spaced apart from the lower surface and the upper surface of the first coil portion 121C and the second coil portion 122C, respectively. For example, the second region R2 of the coupling adjustment portion 130 may be formed to have a relatively thin thickness in the first direction D1 to be spaced apart from the first coil portion 121C and the second coil portion 122C, respectively, while keeping the distance between the first coil portion 121C and the second coil portion 122C constant. When the coupling adjustment portion 130 has such an arrangement, the coupling coefficient may be adjusted and the volume of the second region R2 having a low magnetic permeability may be reduced to improve the saturation current (I sat ).

[0100] Hereinafter, an embodiment will be described in which the specific forms of the winding coils 121 and 122 are different from the previous embodiment. The foregoing embodiments can all be applied to the following modified examples even if not specifically described.

[0101] exist Fig.16In the example of , the first coil portion 121C and the second coil portion 122C may be formed by winding a rectangular wire having a rectangular cross-section, and on the D1-D2 cross-section, the aspect ratio (T2 / W2) may be greater than or equal to 1, and the aspect ratio (T2 / W2) may be the ratio of the thickness T2 of the first coil portion 121C and the second coil portion 122C to the line width W2. Specifically, each of the first coil portion 121C and the second coil portion 122C of the present embodiment may be wound around a winding axis parallel to the first direction D1 using a rectangular metal wire having a cross-sectional aspect ratio greater than or equal to 1 to form at least one turn. As an example, each of the first coil portion 121C and the second coil portion 122C may include a first layer wound from the outside to the inside for 3 turns, and a second layer extending from the first layer and wound from the inside to the outside for 3 turns, but is not limited thereto.

[0102] When the first and second wound coils 121 and 122 have such shapes, the number of turns in a limited space of the body 110 may be easily increased, thereby improving inductance.

[0103] Then, in Fig.17 In the example of, the first coil portion 121C and the second coil portion 122C may partially include an inclined shape in the first direction D1. For example, based on the D1-D2 cross section of each turn, the first coil portion 121C and the second coil portion 122C forming a turn in the first winding coil 121 and the second winding coil 122 may partially include a turn having a cross-sectional shape that is inclined to the left or right.

[0104] Then, in Fig.18 In the example of , the wire forming the first coil portion 121C and the second coil portion 122C can be formed into a circular shape on the D1-D2 cross section. In addition, accordingly, the coating CL on the surface of the wire forming the first coil portion 121C and the second coil portion 122C with an insulating material may also have a circular shape in the D1-D2 cross section. When the first winding coil 121 and the second winding coil 122 have such a shape, the number of turns in the limited space of the main body 110 can be easily increased, thereby improving the inductance. In addition, the design freedom of the number of turns and the stretching direction of the first winding coil 121 and the second winding coil 122 can be high, and therefore can be adjusted to be close to the desired coupling coefficient.

[0105] Then, in Fig.19In the example shown in the transparent stereogram of , there may be differences in the method of connecting the winding coils 121 and 122 to the external electrodes. Specifically, the second winding coil 122 may be disposed on the lower region 110T of the body 110, and the lead portions 122A and 122B of the second winding coil 122 may be disposed in the groove R formed in the lower region 110T. In this case, the lead portions 122A and 122B of the second winding coil 122 may be bent and disposed on the lower surface of the lower region 110T, and for this purpose, an additional groove may be formed on the lower surface of the lower region 110T. The second region R2 of the coupling adjustment portion 130 may be disposed on the second winding coil 122, and the first winding coil 121 may be disposed on the second region R2 of the coupling adjustment portion 130. Similar to the second winding coil 122, the lead portions 121A and 121B of the first winding coil 121 may be disposed in the groove R formed in the lower region 110T. In this case, the lead-out portions 121A and 121B of the first winding coil 121 may be bent and disposed on the lower surface of the lower region 110T, and for this purpose, an additional groove may be formed on the lower surface of the lower region 110T. As shown in the figure, the lead-out portions 121A and 121B of the first winding coil 121 may pass through the second region R2. The upper region 110C of the body 110 may be disposed on the first winding coil 121.

[0106] Then, in Fig. 20 In the example of the embodiment, the main body 110 may include a molding part 111, and the first winding coil 121 and the second winding coil 122 are arranged in the molding part 111 and protrude toward the upper surface of the main body 110. The molding part 111 may be an element included in the main body 110, and may be formed by filling a mold having an inverted T-shaped cross-section with a composite material containing a magnetic material and an insulating resin and then heating and pressing it, but is not limited thereto. The molding part 111 may include a base 111B and a core 111C, the second winding coil 122 is directly arranged on the base 111B, and the core 111C protrudes from the base 111B and passes through the center of the first coil part 121C and the second coil part 122C. The gap G1 between the core 111C and the upper surface of the main body 110 may be narrower than the gap G2 between the first coil part 121C and the upper surface of the main body 110. For example, the core 111C may be implemented as a structure protruding from the upper surface of the first coil part 121C. When the molded part 111 has such a shape, the first and second winding coils 121 and 122 may be stably supported, and deformation of the first and second winding coils 121 and 122 may be prevented when magnetic sheets are stacked or magnetic materials are filled on the body 110 .

[0107] For ease of explanation, although a solid boundary line is shown between an area of ​​the molded portion 111 and the remaining area in the body 110, and a dashed boundary line is shown between an area of ​​the base 111B in the molded portion 111 and an area of ​​the core 111C, the scope of the present disclosure is not limited thereto, and since each component of the body 110 may be integral, no interface may be formed between them.

[0108] The coil assembly according to an example of the present disclosure may be suitable for effectively achieving a target coupling coefficient and may improve factors such as saturation current (I sat ) and other characteristics.

[0109] While example embodiments have been shown and described above, it will be readily apparent to those skilled in the art that modifications and variations may be made without departing from the scope of the present disclosure as defined by the appended claims.

Claims

1. A coil assembly, comprising: a main body having an upper surface and a lower surface opposite to each other in a first direction and a side surface connecting the upper surface and the lower surface; a first winding coil disposed in the body and comprising a first coil portion having at least one turn and a first lead-out portion and a second lead-out portion extending from both ends of the first coil portion, respectively; a second winding coil disposed in the body, spaced apart from the first winding coil in the first direction, and comprising a second coil portion having at least one turn and a third lead-out portion and a fourth lead-out portion extending from both ends of the second coil portion, respectively; a coupling adjustment portion having a portion disposed between the first winding coil and the second winding coil and including a first region through which the winding axes of the first coil portion and the second coil portion pass, and a second region surrounding the first region in a lateral direction different from the first direction; A first external electrode and a second external electrode, connected to the first lead-out portion and the second lead-out portion, respectively; as well as A third external electrode and a fourth external electrode are connected to the third lead-out portion and the fourth lead-out portion, respectively. The first region and the second region respectively include a plurality of magnetic particles and insulating materials between the plurality of magnetic particles, and The magnetic permeability of the first region is different from the magnetic permeability of the second region.

2. The coil assembly according to claim 1, wherein: The magnetic permeability of the first region is higher than the magnetic permeability of the second region.

3. The coil assembly according to claim 1, wherein: The filling rate of the magnetic particles in the first region is higher than the filling rate of the magnetic particles in the second region.

4. The coil assembly according to claim 1, wherein: A difference in D50 value between the magnetic particles in the first region and the magnetic particles in the second region is less than or equal to 10%.

5. The coil assembly according to claim 1, wherein: The first region includes first magnetic particles having a diameter ranging from 5 μm to 61 μm, second magnetic particles having a diameter ranging from 0.9 μm to 4.5 μm, and third magnetic particles having a diameter ranging from 10 nm to 800 nm, and The second region includes first magnetic particles having a diameter ranging from 5 μm to 61 μm, and second magnetic particles having a diameter ranging from 0.9 μm to 4.5 μm.

6. The coil assembly according to claim 1, wherein: The first region is integral with the body.

7. The coil assembly according to claim 1, wherein: The second region covers at least a portion of a side surface of the first coil part.

8. The coil assembly according to claim 1, wherein: The second region is spaced apart from a side surface of the first coil part.

9. The coil assembly according to claim 1 or 8, wherein: The second region covers at least a portion of a side surface of the second coil part.

10. The coil assembly according to claim 1 or 8, wherein: The second region is spaced apart from a side surface of the second coil part.

11. The coil assembly according to claim 1, wherein: The second region covers at least a portion of a side surface of the first coil portion and at least a portion of a side surface of the second coil portion.

12. The coil assembly according to claim 1, wherein: The second region is disposed outside the first coil portion and the second coil portion in the lateral direction.

13. The coil assembly according to claim 1, wherein: The second region extends to the side surface of the body.

14. The coil assembly according to claim 1, wherein: The second region is provided in a region where the first coil portion and the second coil portion overlap in the first direction.

15. The coil assembly according to claim 1, wherein: The second region protrudes from inner surfaces of the first coil portion and the second coil portion toward winding axes of the first coil portion and the second coil portion.

16. The coil assembly according to claim 1, wherein: In a cross section parallel to the first direction, an aspect ratio of the first coil portion and the second coil portion is less than 1.

17. The coil assembly according to claim 1, wherein: In a cross section parallel to the first direction, an aspect ratio of the first coil portion to the second coil portion is greater than or equal to 1.

18. The coil assembly according to claim 1, wherein: In a cross section parallel to the first direction, the conductive wire forming the first coil portion and the second coil portion is circular.

19. The coil assembly according to claim 1, wherein: In a cross section parallel to the first direction, the conductive wires forming the first coil portion and the second coil portion are rectangular.

20. The coil assembly according to claim 1, wherein In a cross section parallel to the first direction, a portion of the first coil portion and the second coil portion has a cross-sectional shape inclined to the left or to the right with respect to the first direction.

21. The coil assembly according to claim 1, wherein: The second region is spaced apart from respective lower and upper surfaces of the first and second coil parts in the first direction.

22. The coil assembly according to claim 1, wherein The body includes a molding portion in which the first and second wire-wound coils are disposed and which protrudes toward the upper surface of the body.

23. The coil assembly according to claim 22, wherein: The molded portion includes a base portion and a core portion, the second wound coil portion is directly disposed on the base portion, the core portion protrudes from the base portion and penetrates central portions of the first coil portion and the second coil portion, and A gap between the core portion and the upper surface of the body is narrower than a gap between the first coil portion and the upper surface of the body.

24. A coil assembly, comprising: a main body having an upper surface and a lower surface opposite to each other in a first direction and a side surface connecting the upper surface and the lower surface; a first winding coil disposed in the body and comprising a first coil portion having at least one turn and a first lead-out portion and a second lead-out portion extending from both ends of the first coil portion, respectively; a second winding coil disposed in the body, spaced apart from the first winding coil in the first direction, and comprising a second coil portion having at least one turn and a third lead-out portion and a fourth lead-out portion extending from both ends of the second coil portion, respectively; a coupling adjustment portion having a portion disposed between the first winding coil and the second winding coil and including a first region through which the winding axes of the first coil portion and the second coil portion pass, and a second region surrounding the first region in a lateral direction different from the first direction; A first external electrode and a second external electrode, connected to the first lead-out portion and the second lead-out portion, respectively; as well as A third external electrode and a fourth external electrode are connected to the third lead-out portion and the fourth lead-out portion, respectively. wherein the first region and the second region include magnetic particles, and The filling rate of the magnetic particles in the first region is different from the filling rate of the magnetic particles in the second region.

25. The coil assembly according to claim 24, wherein: The filling rate of the magnetic particles in the first region is higher than the filling rate of the magnetic particles in the second region.

26. The coil assembly according to claim 24, wherein: The number of the types of the magnetic particles included in the first region is greater than the number of the types of the magnetic particles included in the second region.

27. The coil assembly according to claim 24, wherein: The first region is integral with the body.

28. The coil assembly according to claim 24, wherein: The second region covers at least a portion of a side surface of the first coil portion and at least a portion of a side surface of the second coil portion.

29. The coil assembly according to claim 24, wherein: The second region is disposed outside the first coil portion and the second coil portion in the lateral direction.

30. The coil assembly according to claim 24, wherein: The second region protrudes from inner surfaces of the first coil portion and the second coil portion toward the winding axis lines of the first coil portion and the second coil portion.

31. A coil assembly comprising: a main body having an upper surface and a lower surface opposite to each other in a first direction and a side surface connecting the upper surface and the lower surface; a first winding coil disposed in the body and comprising a first coil portion having at least one turn and a first lead-out portion and a second lead-out portion extending from both ends of the first coil portion, respectively; a second winding coil disposed in the body, spaced apart from the first winding coil in the first direction, and comprising a second coil portion having at least one turn and a third lead-out portion and a fourth lead-out portion extending from both ends of the second coil portion, respectively; a coupling adjustment portion having a portion disposed between the first winding coil and the second winding coil and including a first region through which the winding axes of the first coil portion and the second coil portion pass, and a second region surrounding the first region in a lateral direction different from the first direction; A first external electrode and a second external electrode, connected to the first lead-out portion and the second lead-out portion, respectively; as well as A third external electrode and a fourth external electrode are connected to the third lead-out portion and the fourth lead-out portion, respectively. Wherein, the coupling adjustment part comprises an Fe-based alloy, and A composition of the Fe-based alloy included in the first region is different from a composition of the Fe-based alloy included in the second region.

32. The coil assembly according to claim 31, wherein An amount of Fe of the Fe-based alloy included in the first region is higher than an amount of Fe of the Fe-based alloy included in the second region.

33. The coil assembly according to claim 32, wherein: The Fe-based alloy is a Fe-Si-based alloy, and An amount of Si in the Fe—Si based alloy included in the first region is higher than an amount of Si in the Fe—Si based alloy included in the second region.

34. The coil assembly according to claim 33, wherein: The amount of Si contained in the Fe—Si based alloy in the first region is greater than or equal to 6.5 wt %, and the amount of Si contained in the Fe—Si based alloy in the second region is less than 6.5 wt %.

35. The coil assembly according to claim 34, wherein An amount of Si in the Fe—Si based alloy contained in the second region is greater than or equal to 1 wt % and less than or equal to 5 wt %.

36. A coil assembly comprising: main body; a first winding coil disposed in the body and comprising a first coil portion having at least one turn and a first lead-out portion and a second lead-out portion extending from both ends of the first coil portion, respectively; a second winding coil disposed in the body, spaced apart from the first winding coil in a first direction, and comprising a second coil portion having at least one turn, and a third lead-out portion and a fourth lead-out portion extending from both ends of the second coil portion, respectively; a coupling adjustment portion having a portion disposed between the first winding coil and the second winding coil and including a first region through which the winding axes of the first coil portion and the second coil portion pass, and a second region surrounding the first region in a lateral direction different from the first direction; A first external electrode and a second external electrode, connected to the first lead-out portion and the second lead-out portion, respectively; as well as A third external electrode and a fourth external electrode are connected to the third lead-out portion and the fourth lead-out portion, respectively. The first region and the second region include magnetic particles, The number of types of magnetic particles included in the first region is greater than the number of types of magnetic particles included in the second region.

37. The coil assembly of claim 36, wherein: The magnetic permeability of the first region is higher than the magnetic permeability of the second region.

38. The coil assembly of claim 36, wherein: The filling rate of the magnetic particles in the first region is higher than the filling rate of the magnetic particles in the second region.

39. A coil assembly comprising: Magnetic body; a first winding coil disposed in the magnetic body and comprising a first coil portion having at least one turn and a first lead-out portion and a second lead-out portion extending from two ends of the first coil portion, respectively; a second winding coil disposed in the magnetic body, spaced apart from the first winding coil in a first direction, and comprising a second coil portion having at least one turn and a third lead-out portion and a fourth lead-out portion extending from both ends of the second coil portion, respectively; A first external electrode and a second external electrode, connected to the first lead-out portion and the second lead-out portion, respectively; as well as A third external electrode and a fourth external electrode are connected to the third lead-out portion and the fourth lead-out portion, respectively. wherein the magnetic permeability of the magnetic body in a central region through which the winding axis of the first coil portion and the winding axis of the second coil portion pass is greater than the magnetic permeability in at least one of a gap region between the first winding coil and the second winding coil in the first direction and an outer region of the first winding coil and the second winding coil in a lateral direction different from the first direction.

40. The coil assembly of claim 39, wherein: The magnetic body includes a plurality of magnetic particles, and The filling rate of the magnetic particles in the central region is higher than the filling rate of the magnetic particles in at least one of the gap region and the outer region.

41. The coil assembly of claim 39, wherein: The magnetic permeability in the central region is greater than the magnetic permeability in the gap region.

42. The coil assembly of claim 39, wherein: The magnetic permeability in the central region is greater than the magnetic permeability of the outer region.

43. The coil assembly of claim 39, wherein: The magnetic permeability in the central region is greater than the magnetic permeability of the gap region and the magnetic permeability of the outer region.

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