KR102632366B1 - Coil component - Google Patents

Abstract

A coil component including a body with a coil portion disposed therein, the coil portion includes a plurality of spiral-shaped winding coils, each of the plurality of winding coils is provided in at least two layers, and the winding coils of each layer are interlayer. Connected by a connection part, the plurality of winding coils provided in each layer have the same coil axis, and coil parts arranged alternately with each other on a plane perpendicular to the coil axis are disclosed.

Description

Coil component {COIL COMPONENT}

The present invention relates to coil parts.

Power inductors are key passive elements that perform functions such as current smoothing, current stabilization, and impedance matching, and can be classified into thin-film, wire-wound, and stacked power inductors depending on the manufacturing method. Double-wound power inductors have the advantage of realizing low direct current resistance (Rdc) characteristics, so they are mainly used in non-IT applications such as displays, vehicles, and electronics that require high current characteristics.

Meanwhile, for stable operation of the power inductor under high current conditions, the rated allowable current (Isat, saturation current) characteristic, which means a current of -30% compared to the initial inductance, must be large. Since these Isat characteristics are basically related to the degree of saturation of the magnetic material, the easiest way to obtain high Isat characteristics is to increase the size of the body. However, if the body size is too large, the initial inductance increases, making it difficult to design a low-capacity model.

One of the many purposes of the present invention is to provide a low-capacity coil component with low direct current resistance characteristics and high allowable current characteristics.

One of several solutions proposed through the present invention is to configure the coil unit with a plurality of spiral-shaped winding coils, and to arrange the plurality of winding coils alternately with each other.

For example, a coil component according to an embodiment of the present invention is a coil component including a body with a coil portion disposed therein, and the coil portion includes a plurality of spiral-shaped winding coils, each of the plurality of winding coils is provided in at least two layers, the winding coils of each layer are connected by an interlayer connection, and the plurality of winding coils provided in each layer have the same coil axis and alternate with each other on a plane perpendicular to the coil axis. It may be placed.

As one of the many effects of the present invention, the coil component according to the present invention has the advantage of having low direct current resistance characteristics and high rated allowable current characteristics while having low capacity.

The various and beneficial advantages and effects of the present invention are not limited to the above-described content, and may be more easily understood through description of specific embodiments of the present invention.

1 is a perspective view of a coil component according to an embodiment of the present invention.
Figure 2 is a perspective view showing the coil part of the coil part of Figure 1.
Figure 3 is a cross-sectional view taken along line II' of Figure 1.
Figure 4 is an equivalent circuit diagram of the coil component of Figure 1.
Figure 5 is an enlarged view of the coil part of the coil component of Figure 1.
Figure 6 is a top view of a coil component according to another embodiment of the present invention.
Figure 7 is a graph comparing the direct current resistance characteristics of the invention example and the conventional example.

Hereinafter, various embodiments of the present invention will be described in detail with reference to the attached drawings. The present embodiments may be modified in other forms or various embodiments may be combined with each other, and the scope of the present invention is not limited to the embodiments described below. Additionally, these embodiments are provided to more completely explain the present invention to those with average knowledge in the relevant technical field. For example, the shapes and sizes of elements in the drawings may be exaggerated for clearer explanation.

Meanwhile, the expression “one example” used in this specification does not mean identical embodiments, but is provided to emphasize and explain different unique features. However, the embodiments presented in the description below do not exclude being implemented in combination with features of other embodiments. For example, even if a matter described in a specific embodiment is not explained in another embodiment, it may be understood as a description related to another embodiment, as long as there is no explanation contrary to or contradictory to the matter in the other embodiment.

Hereinafter, a coil component according to an embodiment of the present invention will be described as a power inductor as an example for convenience, but it is not necessarily limited thereto, and the content of the present invention can also be applied to coil components for various other purposes. Of course, it can be applied. Other examples of coil components for various purposes include high frequency inductors, common mode filters, general beads, and GHz beads.

FIG. 1 is a perspective view of a coil component according to an embodiment of the present invention, and FIG. 2 is a perspective view showing the coil portion of the coil component of FIG. 1 .

Referring to Figures 1 and 2, the coil component 100 according to an embodiment of the present invention includes a coil part 10, a body 20 with the coil part 10 disposed therein, and a body 20. It may be configured to include an external electrode 30 disposed outside of.

The coil part 10 serves to perform various functions within an electronic device through characteristics expressed from the coil. For example, when the coil part 100 is a power inductor, the coil part 10 transmits electricity into a magnetic field. By storing it in a certain form, it can maintain the output voltage and play a role in stabilizing the power supply.

The coil unit 10 includes spiral-shaped winding coils 11 and 12. As described above, in the present invention, by constructing the coil unit 10 with a spiral-shaped winding coil, the advantage is that it is easy to implement low Direct Current Resistance (Rdc) characteristics compared to thin-film and laminated coil components. there is.

A plurality of spiral-shaped winding coils 11 and 12 are provided. In this case, compared to conventional coil parts manufactured using a single conductor, it is advantageous to obtain high rated allowable current (Isat) characteristics by reducing the waste of lateral magnetic material area, and from an electrical concept, because the cross-sectional area of the conductor becomes larger. It has the advantage of being able to reduce direct current resistance (Rdc) characteristics.

These plurality of winding coils 11 and 12 have the same coil axis and are arranged alternately with each other on a plane perpendicular to the coil axis. In this way, by arranging the plurality of winding coils 11 and 12 alternately with each other on the same plane, it is easy to fix the winding shape even when the number of turns per layer is small, and this has the advantage of providing low-capacity coil parts. . According to one example, each of the plurality of winding coils may have a number of turns of 1 turn or 2 turns per layer.

Figure 3 is a cross-sectional view taken along line II' of Figure 1.

Referring to FIG. 3, each of the plurality of winding coils 11 and 12 is provided in at least two layers, and the winding coils of each layer are connected by interlayer connection portions 11a and 12a. In this case, assuming that the number of winding coils is k and that the k winding coils are each provided in m layers with n turns per layer, the coil unit may have k(2nm+m-1) coil cross-sections. Here, 2knm coil cross-section is the number of cross-sections of spiral-shaped winding coils located in each layer, and (km-k) coil cross-section is the cross-section number of interlayer connections connecting the winding coils of each layer. In this way, by having each of the plurality of winding coils 11 and 12 in two or more layers, there is an advantage in maximizing the area of the body compared to the same mounting area. In addition, the lead-out portions 11b and 12b of each of the plurality of winding coils 11 and 12 can be positioned outside the coil portion, which has the advantage of reducing the current path and maximizing component characteristics. Here, the interlayer connection parts 11a and 12a and the lead-out parts 11b and 12b form part of the winding coils 11 and 12, and may be formed integrally with the spiral-shaped winding coil located in each layer. .

According to one example, each of the lead-out portions 11b and 12b of the plurality of winding coils 11 and 12 is provided at the outermost portion of the coil portion 10, and the winding direction and direction of the plurality of winding coils 11 and 12 It may be bent in the opposite direction and exposed to the outside of the body 20. By bending the lead-out portions 11b and 12b in the opposite direction to the winding direction of the winding coil in this way, not only can each lead-out portion of the plurality of winding coils be exposed to the outside of the body 20, but also each There is an advantage in that contact resistance can be reduced by expanding the contact area between the lead-out portions and the electrode portion. Otherwise, if the lead-out portion is cut at an angle without being bent, the entire draw-out portion is not exposed to the outside, and there is a risk of it being electrically open.

Figure 4 is an equivalent circuit diagram of the coil component of Figure 1.

Referring to FIG. 4, the plurality of winding coils 11 and 12 form a parallel circuit, which has the advantage of reducing total resistance and inductance.

FIG. 5 is an enlarged view of the coil portion 10 of the coil component of FIG. 1.

Referring to FIG. 5, each of the plurality of winding coils 11 and 12 may be formed by winding a conductive wire having a rectangular cross-section.

According to one example, an insulating layer 13 may be provided between a plurality of adjacent winding coils 11 and 12. In this way, by providing the insulating layer 13 between the winding coils 11 and 12, it is possible to prevent short circuits between coils. Meanwhile, the insulating layer may be formed not only between the winding coils 11 and 12, but also on both the upper and lower surfaces of each winding coil and cover each winding coil, thereby ensuring insulation between each winding coil and the body. You can.

In this case, the plurality of winding coils 11 and 12 may be fused to the insulating layer 13 provided therebetween. In this way, the winding shape can be easily fixed by having a plurality of winding coils 11 and 12 fused to the insulating layer.

According to one example, when the width of each of the plurality of winding coils is w and the height is t, t/w may be 1.5 or more. Here, t/w means the aspect ratio of the single winding coil. If t/w is less than 1.5, the contact area between adjacent coils is reduced, making interlayer fusion difficult, making it difficult to fix the winding shape. On the other hand, the larger t/w is, the more advantageous it is to fix the shape of the winding coil and realize the characteristics of the coil parts. In the present invention, there is no particular limitation on the upper limit of t/w, but if t/w is excessively large, the wire production cost becomes too high. Considering that there is a risk of an increase, the upper limit of t/w can be limited to 2.0.

According to one example, the coil unit 20 includes first and second winding coils 21 and 22, the widths of the first and second winding coils are respectively referred to as w1 and w2, and the first and second winding coils are referred to as w1 and w2. 2 When the height of the winding coil is t, t/(w1+w2) may be less than 1.0. Referring to FIG. 5, the width of the coil portion can be expressed as (w1+w2+d), and the thickness of the coil portion can be expressed as t. However, in general, the thickness (d) of the insulating layer is significantly smaller than the width (w1, w2) of the winding coil, so it can be viewed as (w1+w2+d)≒(w1+w2), resulting in t /(w1+w2) may mean the aspect ratio of the coil part.

That is, the present invention is characterized by using a plurality of winding coils with a relatively high aspect ratio (aspect ratio 1.5 or more) to implement a coil part with an equivalently low aspect ratio (aspect ratio 1.0 or less), and through this, low direct current resistance characteristics and It can implement high rated allowable current characteristics and has the advantage of being able to implement low capacity without changing the number of turns.

Figure 6 is a top view of a coil component according to another embodiment of the present invention.

Referring to FIG. 6, when the widths of each of the plurality of winding coils 11 and 12 are referred to as w1 and w2, w1 and w2 may be different from each other. In this way, it is possible to implement conductors of various thicknesses through a combination of winding coils with different widths (cross-sectional areas), which has the advantage of increasing the degree of freedom in design and development.

The body 20 forms the exterior of the coil component 100. The body 20 may have a substantially hexahedral shape, but is not limited thereto.

Body 20 may include a magnetic material. The magnetic material is not particularly limited as long as it has magnetic properties. For example, pure iron powder, Fe-Si alloy powder, Fe-Si-Al alloy powder, Fe-Ni alloy powder, Fe-Ni-Mo alloy. Powder, Fe-Ni-Mo-Cu alloy powder, Fe-Co alloy powder, Fe-Ni-Co alloy powder, Fe-Cr alloy powder, Fe-Cr-Si alloy powder, Fe-Ni-Cr Fe alloys such as alloy powder or Fe-Cr-Al alloy powder, amorphous alloys such as Fe-based amorphous and Co-based amorphous, Mg-Zn-based ferrite, Mn-Zn-based ferrite, Mn-Mg-based ferrite, Spinel-type ferrites such as Cu-Zn-based ferrite, Mg-Mn-Sr-based ferrite, Ni-Zn-based ferrite, Ba-Zn-based ferrite, Ba-Mg-based ferrite, Ba-Ni-based ferrite, Ba-Co-based ferrite, Hexagonal ferrites such as Ba-Ni-Co ferrite, and garnet type ferrites such as Y-based ferrite.

The magnetic material may include a metal magnetic powder and a resin mixture. The magnetic metal powder may contain iron (Fe), chromium (Cr), or silicon (Si) as a main ingredient, for example, iron (Fe)-nickel (Ni), iron (Fe), iron (Fe) - It may include chrome (Cr) - silicon (Si), etc., but is not limited thereto. The resin may include epoxy, polyimide, liquid crystal polymer, etc., alone or in combination, but is not limited thereto. The magnetic metal powder may be filled with a magnetic metal powder having an average particle diameter (D ₁ , D ₂ ) of 2 or more. In this case, by pressing bimodal metal magnetic powders of different sizes, the magnetic resin composite can be filled, thereby increasing the filling rate.

The body 20 may be formed by forming a magnetic resin composite containing a metal magnetic powder and a resin mixture into a sheet shape and pressing and curing the upper and lower portions of the coil unit 10, but is not limited thereto. At this time, the stacking direction of the magnetic resin composite may be perpendicular to the mounting surface of the coil component. Here, vertical refers to a concept that includes not only a complete 90° but also approximately 90°, that is, approximately 60 to 120°.

When the coil component 100 is mounted on a circuit board, the electrode portion 30 serves to electrically connect the coil component 100 to a circuit board, etc., and the electrode portion 30 includes a plurality of winding coils 21. , 22) may include first and second external electrodes 31 and 32 respectively connected to both ends.

The electrode portion 30 may be formed of a metal with excellent electrical conductivity, such as silver (Ag), palladium (Pd), aluminum (Al), nickel (Ni), titanium (Ti), and gold (Au). ), copper (Cu), platinum (Pt), and tin (Sn) alone or alloys thereof.

Table 1 is a comparison table of characteristics between the invention example and the prior art example, and Figure 7 is a graph comparing the direct current resistance characteristics of the invention example and the conventional example.

In Table 1 and Figure 7, the conventional example is an example of a power inductor manufactured using one winding coil with a height of 300 μm and a width of 180 μm, and the inventive example is an example of a power inductor manufactured using two winding coils with a height of 300 μm and a width of 160 μm. This is an example of a power inductor. In the conventional example and the invention example, the number of layers (2 layers) and the number of turns per layer (4 turns) of the winding coil were the same, and the area of the body (magnetic material) was also manufactured to be the same.

invention example Conventional example Ls (μH) 0.525 0.676 Rdc (mΩ) 7.4 10.7 Isat (A) 10.2 7.82

Referring to Table 1 and FIG. 7, it can be seen that the invention example has improved electrical characteristics while having low capacity.

Meanwhile, in this specification, expressions such as first and second are used to distinguish one component from another component, and do not limit the order and/or importance of the corresponding components. In some cases, the first component may be named the second component, and similarly, the second component may be named the first component without departing from the scope of rights.

The present invention is not limited by the above-described embodiments and attached drawings, but is intended to be limited by the appended claims. Accordingly, various forms of substitution, modification, and change may be made by those skilled in the art without departing from the technical spirit of the present invention as set forth in the claims, and this also falls within the scope of the present invention. something to do.

10: Coil part
11: first winding coil
11a: Interlayer connection of the first winding coil
12: second winding coil
12a: Interlayer connection of the second winding coil
20: body
30: electrode part
31, 32: first and second external electrodes
100: Coil parts

Claims (14)

In the coil part including a body with a coil portion disposed therein,
The coil unit includes a plurality of spiral-shaped winding coils,
Each of the plurality of winding coils is provided with at least two layers, and the winding coils of each layer are connected by an interlayer connection,
The plurality of winding coils provided in each layer have the same coil axis and are arranged in parallel on a plane perpendicular to the coil axis,
The coil unit includes first and second winding coils,
When the widths of the first and second winding coils are respectively w1 and w2, and the heights of the first and second winding coils are t, t/(w1+w2) is 1.0 or less.
According to paragraph 1,
A coil component where each lead-out portion of the plurality of winding coils is provided at the outermost portion of the coil unit and is exposed to the outside of the body by being bent in a direction opposite to the winding direction of the plurality of winding coils.
In the coil part including a body with a coil portion disposed therein,
The coil unit includes a plurality of spiral-shaped winding coils,
Each of the plurality of winding coils is provided with at least two layers, and the winding coils of each layer are connected by an interlayer connection,
The plurality of winding coils provided in each layer have the same coil axis and are arranged in parallel on a plane perpendicular to the coil axis,
Assuming that the number of winding coils is k, and that each of the k winding coils is provided with m layers of n turns per layer, the coil part is a coil part having k(2nm+m-1) coil cross-sections.
According to paragraph 1,
A coil component wherein each of the plurality of winding coils has a number of turns of 1 or 2 turns per layer.
According to paragraph 1,
A coil component in which each of the plurality of winding coils is formed by winding a conductive wire having a rectangular cross-section.
According to paragraph 1,
When the width of each of the plurality of winding coils is w and the height is t, t/w is a coil part of 1.5 or more.
delete According to paragraph 1,
The coil component includes first and second wound coils,
When the widths of the first and second winding coils are respectively w1 and w2, a coil component in which w1 and w2 are different.
According to paragraph 1,
A coil component provided with an insulating layer between the plurality of adjacent winding coils.
According to clause 9,
A coil component in which the plurality of winding coils are fused to an insulating layer provided therebetween.
According to paragraph 1,
The body is a coil component containing a magnetic material.
According to paragraph 1,
The body is a coil part formed by forming a magnetic resin composite containing a metal magnetic powder and a resin mixture into a sheet shape, pressing and curing the upper and lower parts of the coil unit.
According to paragraph 1,
A coil component further comprising first and second external electrodes disposed outside the body and respectively connected to lead-out portions of the plurality of winding coils.
According to clause 13,
A coil component in which the plurality of winding coils constitute a parallel circuit.

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