KR20200117478A - Inductor and dc-dc converter including the same - Google Patents

Abstract

According to one embodiment of the present invention, an inductor includes: a core part; a coil part wound around a middle foot of the core part and including at least one coil having two ends; and a base disposed below the coil part and supporting at least a portion of an outer peripheral surface of each of the at least one coil. The base may include: a frame having a hollow formed and configured to include a major axis and a minor axis at the central portion thereof; and a support part having a plurality of support members protruding toward the outer circumferential surface so as to surround at least a part of the outer circumferential surface. The present invention provides the inductor providing improved fixability, heat dissipation, and electrical characteristics, and the DC converter including the same.

Description

Inductor and DC converter including the same {INDUCTOR AND DC-DC CONVERTER INCLUDING THE SAME}

The present invention relates to an inductor and a DC converter including the same.

In recent years, research on vehicles equipped with electric motors has been actively conducted in accordance with constant environmental concerns and regulations. In such a vehicle, a high voltage battery for driving an electric motor and an auxiliary battery for supplying power to an electric load are usually provided together, and the auxiliary battery can be charged through power of the high voltage battery. In order to charge the auxiliary battery, it is necessary to convert the DC power of the high-voltage battery into a DC power corresponding to the voltage of the auxiliary battery, and a DC-DC converter can be used for this.

1 is a block diagram showing an example of a typical DC converter configuration.

Referring to FIG. 1, the DC converter 10 is disposed between the first batteries Batt 1 and 20 and the second batteries batt 2 and 30, and the driving circuit 11, the transformer 12, and the output circuit ( 13) may be included.

The first battery 20 outputs a DC voltage and a DC current, and the transformer 12 may convert an AC voltage and an AC current. Accordingly, the driving circuit 11 converts the direct current output from the first battery 20 into an alternating current that changes over time so that the alternating current is input to the transformer 12 and supplies it to the primary coil of the transformer 12. I can. To this end, the driving circuit 11 may include a plurality of driving switches constituting a full bridge, and each driving switch may operate under the control of the controller 40.

The transformer 12 receives AC power from the driving circuit 11, boosts or steps down to correspond to the relative voltage difference between the first battery 20 and the second battery 30, and outputs power converted into a secondary coil. .

The output circuit 13 may convert the AC current output from the transformer 12 into a DC current and transfer it to the second battery 30.

The output circuit 13 may generally include a low pass filter including an output inductor and an output capacitor. The output inductor is designed in consideration of a margin factor to withstand the high current transmitted from the transformer 12, and in particular, a square (or square) coil having a square cross section is usually applied to a large-capacity inductor of 2 kW or more. However, when such a wire coil is applied, there is a limitation in applying a screw fastening method using a screw screw in fastening a terminal for mounting on a substrate. Specifically, when the screw is fastened, it is energized through pressurized contact between the terminal and the screw. In this case, there is a concern of a decrease in characteristics due to deterioration due to an increase in contact resistance, and when a separate extension line or bus bar is applied, the There is a problem that it increases and requires a separate fixing means. Accordingly, although the terminal of the output inductor can be directly soldered to the substrate, there is a need for an inductor structure that has vibration resistance in a vehicle environment and enables efficient heat dissipation.

The technical problem to be achieved by the present invention is to provide an inductor that provides more improved fixability, heat dissipation, and electrical characteristics, and a DC converter including the same.

The technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems that are not mentioned will be clearly understood by those of ordinary skill in the technical field to which the present invention belongs from the following description. I will be able to.

An inductor according to an embodiment includes a core portion; A coil unit including at least one coil wound around the middle foot of the core unit; A base disposed under the coil unit and supporting at least a portion of an outer circumferential surface of each of the at least one coil, wherein the base includes a frame; And a first support member and a second support member protruding toward the outer circumferential surface so as to surround at least a portion of the outer circumferential surface, and disposed to face each other between a hollow disposed at the center of the base and two inner edges opposite to each other of the frame. A support portion having a, and the support portion may include a plurality of through holes through which both ends of each of the at least one coil penetrate in a vertical direction.

For example, the upper surface of the frame may contact the lower surface of the core part.

For example, the plurality of through holes may be alternately disposed with the hollow interposed therebetween.

For example, the first support member has a first curved surface facing a first portion of the outer peripheral surface, the second support member has a second curved surface facing a second portion of the outer peripheral surface, and the first curved surface And a radius of curvature of each of the second curved surfaces may correspond to a radius of curvature of the outer peripheral surface.

For example, a third portion between the first portion and the second portion on the outer circumferential surface may be exposed downward through the hollow.

In addition, a DC converter according to an embodiment includes: a driving circuit for receiving first DC power and converting it into first AC power; A transformer converting the first AC power into second AC power having at least different voltages; And an output circuit outputting the second AC power as second DC power, and including at least an inductor, wherein the inductor comprises a core portion; A coil unit including at least one coil wound around the middle foot of the core unit; A base disposed under the coil unit and supporting at least a portion of an outer circumferential surface of each of the at least one coil, wherein the base includes a frame; And a first support member and a second support member protruding toward the outer circumferential surface so as to surround at least a portion of the outer circumferential surface, and disposed to face each other between a hollow disposed at the center of the base and two inner edges opposite to each other of the frame. A support portion having a, and the support portion may include a plurality of through holes through which both ends of each of the at least one coil penetrate in a vertical direction.

In addition, the inductor according to an embodiment includes a core portion; A coil unit wound around the middle foot of the core unit and including at least one coil having two ends; And a base disposed under the coil unit and supporting at least a portion of an outer circumferential surface of each of the at least one coil, wherein the base has a frame having a hollow formed to include a major axis and a minor axis at a central portion; And a support portion having a plurality of support members protruding toward the outer peripheral surface to surround at least a portion of the outer peripheral surface, wherein the support portion includes: a first support member and a third support member disposed along the first major axis of the hollow; And a second support member and a fourth support member disposed along a second long axis opposite to the first major axis of the hollow, and disposed to face each other with the first support member and the third support member. A first through hole may be formed between the first support member and the third support member so that one of the end portions of the at least one coil penetrates.

The inductor according to the embodiment and the DC converter including the same include a base having a hollow and a support portion to improve heat dissipation performance, and improve vibration resistance during soldering, so that stable electrical characteristics can be expected.

The effects that can be obtained in the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those of ordinary skill in the art from the following description. will be.

1 is a block diagram showing an example of a typical DC converter configuration.
2A and 2B are perspective views of an inductor according to an embodiment.
3 is a perspective view of a core according to an embodiment.
4 is an exploded perspective view of a coil unit according to an embodiment.
5A is a plan view of a base according to an embodiment.
5B is a perspective view of a base according to an embodiment.
5C is a side view of a base according to an embodiment.
6A is a cross-sectional view illustrating an example of an inductor mounted on a substrate according to an exemplary embodiment.
6B is a cross-sectional view illustrating another example of an inductor mounted on a substrate according to an exemplary embodiment.
7 is a perspective view of a base according to another embodiment.
8 is a perspective view of an inductor according to another embodiment.
9 is a cross-sectional view illustrating an example in which an inductor according to another embodiment is mounted on a substrate.

The present invention is intended to illustrate and describe specific embodiments in the drawings, as various changes may be made and various embodiments may be provided. However, this is not intended to limit the present invention to a specific embodiment, it is to be understood to include all changes, equivalents, and substitutes included in the spirit and scope of the present invention.

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

When a component is referred to as being "connected" or "connected" to another component, it is understood that it may be directly connected or connected to the other component, but other components may exist in the middle. Should be. On the other hand, when a component is referred to as being "directly connected" or "directly connected" to another component, it should be understood that there is no other component in the middle.

In the description of the embodiments, each layer (film), region, pattern or structures are "on" or "under" of the substrate, each layer (film), region, pad or patterns. The substrate to be formed on includes both directly or through another layer. The criteria for the top/top or bottom/bottom of each layer will be described based on the drawings. In addition, in the drawings, the thickness or size of each layer (film), region, pattern, or structure may be modified for clarity and convenience of description, and thus the actual size is not entirely reflected.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present application, terms such as "comprise" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, but one or more other features. It is to be understood that the presence or addition of elements or numbers, steps, actions, components, parts, or combinations thereof, does not preclude in advance.

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

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

First, an inductor 100 according to an exemplary embodiment will be described with reference to FIGS. 2A and 2B. 2A and 2B are perspective views of an inductor according to an embodiment.

2A and 2B, the inductor 100A according to an embodiment includes a core portion 110, a coil portion 120 wound along the outer peripheral surface of the middle foot of the core portion 110, and a coil portion 120 below. In may include a base 130 supporting at least a portion of the lower side of the outer peripheral surface of the coil unit 120.

The core portion 110 having the characteristic of a magnetic circuit may serve as a path for magnetic flux. The core portion may have a form in which two cores 111 and 112 are coupled to each other. Each core (111, 112) may be an "E" type core, as described later in FIG. 3, one of the two (111, 112) is composed of an "E" type core and the other is an "I" type core It could be. When both of the cores 111 and 112 are "E"-shaped cores, the two cores 111 and 112 may have a shape that is symmetrical to each other, or may have an asymmetric shape. The core part 110 may include a magnetic material. For example, the core part 110 may include Mn-Zn ferrite, and the permeability μ of ferrite may be 2,000 to 15,000, but is not limited thereto. Since specific shapes of the "E"-type core and the "I"-type core are widely known, detailed descriptions will be omitted for the sake of simplicity of the specification.

The coil unit 120 may include a conductive metal such as copper or aluminum, and at least one metal conductor (ie, each wire) having a polygonal cross-sectional shape is wound around the middle foot of the core unit 110 Can be One metal wire constitutes one coil, and both ends of the wire may correspond to a terminal 120T for fixing and conducting electricity with other components such as a substrate of a device (eg, a DC converter) including the inductor 100A. have.

The base 130 is disposed under the coil unit 120 to support the coil unit, and a portion of the base 130 may overlap even if it is stirred in a vertical direction (eg, the Z-axis direction) with the bottom surface of the core unit 110. In addition, the base 130 may include a hollow in the center, so that a part of the lower side of the coil unit 120 is exposed downward as shown in FIG. 2B to help heat radiation. In addition, when the base 130 includes a material having excellent thermal conductivity, heat generated in the coil unit 120 may be at least externally discharged through contact with the outer peripheral surface of the coil. Here, the material having excellent thermal conductivity may include aluminum, copper, or the like, but is not limited thereto. In addition, the base 130 may have a plurality of through holes so that the terminals 120T of the coil unit 120 are inserted and drawn out. Accordingly, the separation distance between one or more coils constituting the coil unit 120 may be adjusted by adjusting the arrangement interval of the through hole in the Y-axis direction, and this separation distance is the substrate (not shown) to which the terminal 120T is to be coupled. It can correspond to the shape.

Hereinafter, individual shapes of each component constituting the inductor 100A will be described in more detail with reference to FIGS. 3 to 5C.

3 is a perspective view of a core according to an embodiment.

In FIG. 3, it is described based on one of the core parts 110, but the other core 111 is assumed to have a left-right symmetric shape with respect to the core 112 and the Y-axis shown in FIG. 3. , It will be replaced with the description of the core 111.

3, one side of the core 112 includes a long side extending in one direction (eg, X-axis direction) and a short side extending in another direction (eg, Z-axis direction) crossing one direction. It can have a rectangular shape.

In addition, the core 112 may include a middle foot 112m having a cylindrical shape and an outer foot 112o disposed on both sides facing each other around the middle foot 112m. As described above, one or more coils constituting the coil unit 120 may be wound along the outer circumferential surface of the midfoot 112m. In addition, the midfoot 112m is shown to have a cylindrical shape in the following drawings including FIG. 3, but this is illustrative and may have various shapes such as a polygonal column or an elliptical column shape.

In configuring the core portion 110, the midfoot (112m) of the core 112 and the midfoot (not shown) of the remaining core 111 face each other at a predetermined distance (for example, in the Y-axis direction). , 100um) may be spaced apart to form a gap.

4 is an exploded perspective view of a coil unit according to an embodiment.

Referring to FIG. 4, the coil unit 120 according to the embodiment may include three coils 121, 122, and 123. The number of such coils is exemplary, and the coil unit 120 according to the embodiment may include more or less coils. Each of the coils 121, 122, and 123 may be composed of a single metal wire, and both ends of the metal wire may correspond to terminals 121T, 122T, and 123T.

For example, the cross-sectional shape of the metal conductors constituting each of the coils 121, 122, 123 may be rectangular, but this is only an example, and the inner angle of the square forming the cross-sectional shape of the individual metal conductors is not necessarily a right angle. May have a curved shape. In addition, the outer surface of the metal conductors constituting each coil 121, 122, 123 is an insulating material (for example, for insulation between the core portion 110 and adjacent surfaces overlapping in the thickness direction (eg, Y-axis direction) during winding) Enamel).

On the other hand, each of the coils (121, 122, 123) may be arranged side by side along the extension direction of the midfoot (110m) (i.e., Y-axis direction), two coils adjacent to each other along the extension direction of the midfoot (110m) is at least some May be in contact with each other or may be separated. In the case of being spaced apart, the separation distance may be adjusted by the arrangement interval of the through-holes of the base 130 to be described later.

Next, a configuration of the base 130 according to an embodiment will be described with reference to FIGS. 5A to 5C together.

5A is a plan view of a base according to an exemplary embodiment, FIG. 5B is a perspective view of a base according to an exemplary embodiment, and FIG. 5C is a side view of the base according to an exemplary embodiment.

5A to 5C, the base 130 according to the embodiment includes a frame 131, a support portion 133, 134 disposed between the hollow 132 of the central portion of the base 130 and the frame 131. Can include.

The frame 131 may have a plate shape and a square annular planar shape. However, this is merely an example, and is not necessarily limited thereto, and it is sufficient to have a shape corresponding to the shape of the bottom surface of the core portion 110. That is, at least a portion of the upper surface of the frame 131 may contact the lower surface of the core part 110 when configuring the inductor 100A.

The hollow 132 may include a long axis extending in one direction (eg, in the Y-axis direction) and a short axis extending in another direction crossing with one direction (eg, in the X-axis direction).

The support parts 133 and 134 may protrude toward the outer circumferential surface of the coil unit 120 so as to surround at least a portion of the lower side of the outer circumferential surface of the coil unit 120, and when configuring the inductor 100A, the coil unit 120 It can play a supporting role from the bottom. In addition, the support portions 133 and 134 may include a first support portion 133 and a second support portion 134. The first support 133 and the second support 134 may be disposed to face each other with the hollow 132 interposed therebetween, and may have a shape rotated 180 degrees symmetrically to each other in a plane around the hollow 132 . In addition, the first support 133 and the second support 134 may be disposed between the hollow 132 and two inner edges of the frame 131 facing each other. For example, the first support part 133 is disposed between the inner edge of the left side of the frame 131 and the hollow 132 based on FIG. 5A, and the second support part 134 is disposed between the inner edge of the right side of the frame 131 and It may be disposed between the hollow (132). In other words, the first support 133 is disposed along one long axis disposed on the left side of the hollow 132, and the second support 134 is the other long axis disposed on the right opposite to the left long axis of the hollow 132 Can be arranged accordingly.

In addition, the first support part 133 may include a first support member 133_1 and one or more third support members 133_3, and the second support part 134 includes a second support member 134_2 and one or more 4 It may include a support member (134_4). Each of the first support member 133_1 and one or more third support members 133_3 may be spaced apart from each other along the long axis direction (eg, Y axis direction) of the hollow 132 and disposed side by side. In addition, each of the second support member 134_2 and the at least one fourth support member 134_4 may be spaced apart from each other along the long axis direction of the hollow 132 and may be disposed side by side. Specifically, the first support member 133_1 and the second support member 134_2 are opposed to each other in the diagonal direction of the hollow 132, and the hollow 132 in each of the first support portion 133 and the second support portion 134 It can be arranged at one edge in the direction of the major axis of the.

In addition, the first support member 133_1 may have a longer length in the long axis direction of the hollow 132 than at least one third support member 133_3, and the second support member 134_2 includes at least one fourth support member It may have a longer length in the long axis direction of the hollow 132 than (134_4). In addition, the support portions 133 and 134 may include both ends of each of the plurality of coils constituting the coil unit 120, that is, a plurality of through holes through which the terminals penetrate in the vertical direction. At least one of the plurality of through holes (for example, TH3_1) is disposed between the first support member 133_1 and the third support member 133_3, and at least one other (for example, TH1_2) includes the second support member 134_2 and It may be disposed between the fourth support members 134_4. As a result, the difference in length in the long axis direction of the hollow 132 between the first support member 133_1 and the third support member 133_3 and the second support member 134_2 and the fourth support member 134_4 is the coil 121, 122, 123) is wound, and the ends of each are not aligned with each other in the X-axis direction and are shifted.

When the coil unit 120 includes three coils, that is, the first coil 121, the second coil 122, and the third coil 123, as shown in FIG. 4, the support units 133 and 134 A total of six through holes TH1_1, TH2_1, TH3_1, TH1_2, TH2_2, and TH3_2 may be disposed in the. In this case, the two terminals 121T of the first coil 121 penetrate through the 1_1 through-hole TH1_1 and the 2_1 through-hole TH2_1, respectively. In this case, the plurality of through holes TH1_1, TH2_1, TH3_1, TH1_2, TH2_2, and TH3_2 may be alternately disposed with the hollow 132 interposed therebetween. This is because the positions of the two terminals are shifted so that they do not cross each other on the X-axis as each coil forms a turn.

In addition, the first support member 133 has a first curved surface 133S facing a part of the outer peripheral surface of the coil unit 120 (hereinafter, referred to as a “first part” for convenience), and the second support unit 134 It has a second curved surface 134S facing the other part (hereinafter, referred to as a "second part" for convenience) among the outer circumferential surfaces of the coil unit 120. Each of the first curved surface 133S and the second curved surface 134S may increase in inclination to satisfy a predetermined radius of curvature as they move away from the hollow 132 along the X axis. In this case, the predetermined radius of curvature may correspond to the outer peripheral surface of the coil unit 120 or the radius of curvature of the outer diameter. The height of the first support part 133 and the second support part 134 from the upper surface of the frame 131 may correspond to 15 to 30% of the outer diameter of the coil part 120, but is not limited thereto.

Meanwhile, the hollow 132 may allow a portion of the lower side of the outer peripheral surface of the coil unit 120 to be exposed downward as described above. At this time, the exposed lower part of the outer circumferential surface of the coil unit 120 (hereinafter, referred to as a “third part” for convenience) is It may be a part located between the second part.

Next, a form in which the inductor 100A according to the embodiment is mounted on a substrate and effects thereof will be described with reference to FIGS. 6A and 6B.

6A is a cross-sectional view illustrating an example of an inductor mounted on a substrate according to an exemplary embodiment.

Referring to FIG. 6A, the terminal 120T of the inductor 100A according to the embodiment is mounted on a substrate 200 by soldering. As shown, the lower part (ie, the first part and the second part) of the outer peripheral surface of the coil part 120 is the first curved surface 133S and the second support part 134 of the first support part 133 of the base 130 ), even if vibration occurs while being seated on the second curved surface 134S of ), the vibration of the coil unit 120 is minimized, and thus soldering separation may be prevented. In addition, as the base 130 contains a thermally conductive material, heat generated from the coil unit 120 can quickly move to the core unit 110, thereby improving heat dissipation performance. Between the first curved surface 133S and the first portion of the core portion 120 and between the second curved surface 134S and the second portion of the core portion 120, a thermally conductive material (e.g., a heat dissipation sheet) for promoting heat transfer , Thermal grease, gap filler), etc. may be additionally disposed.

In addition, an air cooling effect may be expected as the third portion of the coil unit 120 is exposed downward through the hollow 132 of the base 130. On the contrary, when the base 130 does not exist, when vibration occurs, the coil unit 120 continuously generates a displacement corresponding to the difference in the inner diameter of the middle foot outer diameter of the core unit 110 and the inner diameter of the coil unit 120, and there is a fear of soldering separation. , Heat of the coil unit 120 can be conducted only through an unstable contact surface with the midfoot of the core unit 110, and the remaining heat is bound to be released through an air flow.

According to another aspect of the present embodiment, heat dissipation through conduction may be considered also in the third portion of the core portion 120 exposed downward through the hollow 132. This will be described with reference to FIG. 6B.

6B is a cross-sectional view illustrating another example of an inductor mounted on a substrate according to an exemplary embodiment.

In FIG. 6B, a first protruding upward in a region where at least a portion of the housing 300 surrounding the substrate 200 and the inductor 100A overlaps with the hollow 132 in a vertical direction (ie, in the Z-axis direction) compared to FIG. 6A. The protrusion 310 may be provided. The upper surface of the first protrusion 310 may be a curved surface having a predetermined radius of curvature, and may face the exposed surface 120ES corresponding to the third portion of the outer peripheral surface of the core part 120. In this case, the radius of curvature of the upper surface may correspond to the outer diameter of the core part 120 or the radius of curvature of the outer peripheral surface. A thermally conductive material (eg, heat dissipation sheet, thermal grease, gap filler) for promoting heat transfer may be additionally disposed between the exposed surface 120ES and the upper surface of the first protrusion 310. In this case, compared to the case of FIG. 6A, heat of the coil unit 120 may be radiated through the first protrusion 310 in a conductive manner, so that heat dissipation performance may be further improved.

In the embodiment described so far, it has been described that the frame 131 of the base 130 is disposed under the bottom of the core part 110, but according to another embodiment, the base 130 is inserted into the core part 110. May be. This will be described with reference to FIGS. 7 to 9.

7 is a perspective view of a base according to another embodiment.

The base 130 ′ according to another exemplary embodiment illustrated in FIG. 7 is a first support 133 ′ and a second support 134 ′ compared to the base 130 according to the exemplary embodiment described above with reference to FIGS. 5A to 5C. ) And the hollow 132 have a similar shape, the difference will be mainly described, and description of the overlapping part will be omitted.

Referring to FIG. 7, a base 130 ′ according to another exemplary embodiment has a form in which the frame 131 is omitted compared to the base 130 according to an exemplary embodiment. Accordingly, a first bridge BR1 and a second bridge BR2 may be included in order to connect and maintain a gap between the first support part 133 ′ and the second support part 134 ′.

8 is a perspective view of an inductor 100B according to another embodiment.

Referring to FIG. 8, the base 130 ′ from which the frame is omitted may be accommodated in a space between the sidewall and the outer leg of the core part 110 and the core part 120. Accordingly, the bottom surface of the core portion 110 may be exposed downward without being covered by the base 130 ′.

9 is a cross-sectional view illustrating an example in which an inductor 100B is mounted on a substrate according to another embodiment.

The mounting form of the inductor 100B shown in FIG. 9 is partially similar to that of FIG. 6B, but the arrow indicates a movement path of the column. However, in FIG. 9, a through hole is additionally disposed outside the through hole through which the terminal passes through the substrate 200B. In addition, in addition to the first protrusion 310 that promotes heat dissipation of the third portion of the core 120 in the housing 300 ′ surrounding the substrate 200 ′ and the inductor 100B, additionally to the substrate 200 ′. A second protrusion 320 ′ and a third protrusion 330 ′ protruding toward the outer bottom surface of the core part 110 through the arranged through holes are further provided. In this case, in addition to heat dissipation of the conduction method through the first protrusion 310 ′ compared to the case of FIG. 6, heat transferred to the core part 110 through the base 130 ′ Through the protrusion 330 ′, heat may be additionally radiated in a conductive manner. Therefore, heat dissipation performance may be further improved by diversified heat dissipation paths.

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

The embodiments have been described above, but these are only examples and do not limit the present invention, and those of ordinary skill in the field to which the present invention belongs are not illustrated above within the scope not departing from the essential characteristics of the present embodiment. It will be seen that various modifications and applications are possible. For example, each component specifically shown in the embodiment can be modified and implemented. And differences related to these modifications and applications should be construed as being included in the scope of the present invention defined in the appended claims.

100A, 100B: inductor 110: core
120: coil unit 130, 130': base
200, 200': substrate 300, 300': housing

Claims (7)

Core part;
A coil unit wound around the middle foot of the core unit and including at least one coil having two ends; And
It is disposed under the coil unit and includes a base supporting at least a portion of an outer peripheral surface of each of the at least one coil,
The base,
A frame having a hollow formed to include a major axis and a minor axis in the central portion; And
Including; a support having a plurality of support members protruding toward the outer peripheral surface so as to surround at least a portion of the outer peripheral surface,
The support part
A first support member and a third support member disposed along the first major axis of the hollow; And
And a second support member and a fourth support member disposed along a second long axis opposite to the first major axis of the hollow, and disposed to face each other with the first support member and the third support member,
An inductor comprising a first through hole formed between the first support member and the third support member so that one of the ends of the at least one coil passes through. The method of claim 1,
And a second through hole formed between the second support member and the fourth support member so that the other one of the end portions of the at least one coil penetrates. The method of claim 1,
The upper surface of the frame is in contact with the lower surface of the core part, the inductor. The method of claim 2,
The first through hole and the second through hole are alternately disposed with the hollow interposed therebetween. The method of claim 1,
The first support member has a first curved surface facing the first portion of the outer circumferential surface, the second support member has a second curved surface facing the second portion of the outer peripheral surface,
The inductor, wherein a radius of curvature of each of the first curved surface and the second curved surface corresponds to a radius of curvature of the outer peripheral surface. The method of claim 5,
A third portion between the first portion and the second portion on the outer circumferential surface is exposed downward through the hollow. A driving circuit for receiving the first DC power and converting it into first AC power;
A transformer converting the first AC power into second AC power having at least different voltages; And
Outputting the second AC power as second DC power, and including an output circuit including at least an inductor,
The inductor is
Core part;
A coil unit wound around the middle foot of the core unit and including at least one coil having two ends; And
It is disposed under the coil unit and includes a base supporting at least a portion of an outer peripheral surface of each of the at least one coil,
The base,
A frame having a hollow formed to include a major axis and a minor axis in the central portion; And
Including; a support having a plurality of support members protruding toward the outer peripheral surface so as to surround at least a portion of the outer peripheral surface,
The support part
A first support member and a third support member disposed along the first major axis of the hollow; And
And a second support member and a fourth support member disposed along a second long axis opposite to the first major axis of the hollow, and disposed to face each other with the first support member and the third support member,
A direct current converter comprising a first through hole formed between the first support member and the third support member so that one of the ends of the at least one coil passes through.

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