KR20170140720A - Inductor - Google Patents

Abstract

An inductor according to an embodiment of the present invention includes a magnetic frame which includes a first region and a second region surrounded by the first region and being formed higher than the first region, a coil disposed on the first region and wound around the second region, a first electrode connected to the first end of the coil, and a second electrode connected to the second end of the coil. A height from the first region to the second region is lower than a height from the first region to the coil. It is possible to provide an inductor with excellent performance.

Description

Inductor {INDUCTOR}

The present invention relates to an inductor.

An inductor is one of electronic components applied on a printed circuit board, and can be applied to a resonance circuit, a filter circuit, a power circuit, and the like due to its electromagnetic characteristics.

In recent years, miniaturization and thinning of various electronic devices such as communication devices and display devices have become important issues. Therefore, it is necessary to reduce the size, thickness, and high efficiency of the inductors applied to such electronic devices. For example, a chip inductor can be applied to a power circuit and can serve to stabilize the output of current by removing the ripple current. These chip inductors are required to have high rated current, low resistance, miniaturization and thinness.

A general inductor may be a structure in which a coil is wound on a magnetic core, or a structure in which a winding coil is embedded in a magnetic body.

Fig. 1 shows an example of a winding coil, and Fig. 2 is a perspective view of a general inductor.

Referring to Figs. 1 and 2, the winding coil 10 is buried in the magnetic body 20 and then cut. The extended portion 12 of the winding coil 10 is exposed to the surface of the magnetic body 20 and can be connected to the external electrode 30. [

At this time, the inductance of the inductor can be changed according to the magnetic permeability of the magnetic body 20. For example, as the magnetic permeability of the magnetic body 20 increases, the inductance of the inductor also increases. However, if the permeability increases, there is a problem that the current capacity of the inductor is reduced or a high frequency loss occurs. Accordingly, there is a need for a method capable of reducing inductance, reducing current capacity, and reducing high frequency loss.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an inductor having a simple manufacturing process and excellent performance.

The inductor according to an embodiment of the present invention includes a magnetic frame including a first region and a second region surrounded by the first region and formed higher than the first region, A first electrode connected to a first end of the coil and a second electrode connected to a second end of the coil, wherein the first electrode extends from the first region to the second region Is lower than the height from the first region to the coil.

And a magnetic body for embedding the coil, wherein a part of the magnetic body can be disposed in the inner diameter of the coil.

The magnetic frame and the magnetic body may include different materials.

The magnetic permeability of the magnetic frame and the magnetic permeability of the magnetic body may be different.

The magnetic permeability of the magnetic frame may be higher than the magnetic permeability of the magnetic body.

The magnetic permeability of the magnetic frame may be at least five times the magnetic permeability of the magnetic body.

The height from the first region to the second region may be 10 to 90% of the height of the coil from the first region.

A groove may be formed in the bottom surface of the magnetic frame.

The magnetic material may include a magnetic sheet laminated in a plurality of sheets.

The magnetic sheet may be selected from the group consisting of pure iron, silicon steel sheet magnetic powder, amorphous magnetic powder, permalloy magnetic powder, HF (High Flux) magnetic powder, Sendust magnetic powder, ferrite magnetic powder, Fe- Fe-Si-Nb-Cu based magnetic powder, Fe-Si-Cr-Al based magnetic powder, Fe-Si-Cr based magnetic powder, Powder and an Fe- (Si-P-) CB-based magnetic powder.

According to an embodiment of the present invention, an inductor assembly includes a substrate, electrodes formed on the substrate, an inductor mounted on the electrode, and a solder connecting the inductor and the electrode, And a second region surrounded by the first region and formed higher than the first region; a coil disposed on the first region and wound around the second region; A first electrode connected to the first end and a second electrode connected to the second end of the coil, wherein a height from the first region to the second region is greater than a height from the first region to the coil low.

A method of manufacturing an inductor according to an embodiment of the present invention includes the steps of: providing a magnetic frame including a first region and a second region surrounded by the first region and formed higher than the first region; Disposing a coil wound around the second region on the first region of the magnetic field, and embedding the coil disposed on the magnetic frame in the magnetic body.

The magnetic frame may include a plurality of second regions disposed at predetermined intervals, and the coils may include a plurality of coils that are consecutively wound at the same intervals as the intervals at which the second regions are disposed.

The magnetic body may include a magnetic sheet laminated in plural pieces.

The embedding step may include disposing a magnetic sheet stacked in the plurality of sheets in at least one of the upper and lower portions of the magnetic frame, and heating and pressing the magnetic sheet.

According to the embodiment of the present invention, it is possible to obtain an inductor having a simple and compact manufacturing process and a thin and excellent performance.

Particularly, according to the embodiment of the present invention, it is possible to obtain an inductor having a high inductance, a large current capacity and a minimized high frequency loss.

Fig. 1 shows an example of a winding coil.
2 is a perspective view of a general inductor.
3 is a perspective view of an inductor according to one embodiment of the present invention.
4 is a top view of an inductor according to an embodiment of the present invention.
5 is a bottom view of an inductor according to an embodiment of the present invention.
6 and 7 are cross-sectional views based on X in Fig.
8-10 illustrate a method of manufacturing an inductor according to one embodiment of the present invention.
11 is a graph showing the relationship between the magnetic permeability ratio of the magnetic frame and the inductance with respect to the magnetic permeability of the upper magnetic body.
FIG. 12 shows an inductor assembly in which an inductor according to an embodiment of the present invention is mounted on a PCB.
13 is a bottom view of an inductor according to another embodiment of the present invention.
14 is a cross-sectional view of a magnetic frame with reference to Y line in Fig.
15 is a graph showing the relationship between the power capacity and the inductance according to the depth of the groove formed in the magnetic frame.
16 shows an inductor according to another embodiment of the present invention.

The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated and described in the drawings. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

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

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings, wherein like or corresponding elements are denoted by the same reference numerals, and redundant description thereof will be omitted.

FIG. 3 is a perspective view of an inductor according to an embodiment of the present invention, FIG. 4 is a top view of an inductor according to an embodiment of the present invention, FIG. 5 is a bottom view of an inductor according to an embodiment of the present invention, 6 and 7 are cross-sectional views based on X in Fig.

3 to 7, the inductor 100 includes a magnetic frame 110, a coil 120, a magnetic body 130, a first electrode 140, and a second electrode 150.

Here, the magnetic frame 110 may include a first region 112 and a second region 114 surrounded by the first region 112. At this time, the second region 114 may be formed higher than the first region 112. At this time, the magnetic frame 110 includes a powder of a metal alloy having a soft magnetic property, and is made of a metal such as pure iron, silicon steel sheet magnetic powder, amorphous magnetic powder, permalloy magnetic powder, HF (High Flux) magnetic powder, Fe-Si-B based magnetic powder, Fe-Ni-based magnetic powder, Fe-Si-based magnetic powder, Fe-Si-Al based magnetic powder, Fe- (Si-P-) CB-based magnetic powder, a Fe-Si-Cr-Ni-based magnetic powder and a Fe- (Si-P-) CB-based magnetic powder.

The coil 120 may be disposed on the magnetic frame 110 and may be wound around the second region 114. That is, the coil 120 is disposed on the first region 112 of the magnetic frame 110 and may be wound to surround the second region 114. [ Accordingly, the coil 120 can be stably supported on the magnetic frame 110, and the possibility of the arrangement being shifted during the manufacturing process or the movement process is reduced. Thus, stable performance can be maintained.

Here, an example in which the coil 120 is wound in a two-layered rectangular conductor is shown, but the present invention is not limited thereto. Conductors having various cross-sectional shapes and thicknesses can be wound in various ways, such as in a helical shape, an a-helical shape, and can be wound in single or multiple layers.

Then, the coil 120 is embedded in the magnetic body 130. The magnetic material 130 includes a powder of a metal alloy having a soft magnetic property and may be selected from the group consisting of pure iron, silicon steel sheet magnetic powder, amorphous magnetic powder, permalloy magnetic powder, HF (High Flux) magnetic powder, Si-B system magnetic powder, Fe-Si-B system magnetic powder, Fe-Ni-system magnetic powder, Fe-Si-system magnetic powder, Fe- Nb-Cu system magnetic powder, Fe-Si-Cr-Al system magnetic powder and Fe- (Si-P-) CB system magnetic powder. At this time, the magnetic body 130 may include a magnetic sheet laminated in plural pieces. When the magnetic substance 130 is made of a magnetic sheet, the magnetic powder is uniformly distributed in the magnetic sheet, so that the inductor 100 having uniform performance can be obtained. The magnetic sheet may have a thickness of, for example, 0.01 to 1 mm or less.

The first electrode 140 surrounds a part of the magnetic body 130 and is connected to the first end 122 of the coil 120. The second electrode 150 surrounds a part of the magnetic body 130, To the second end 124 of the housing 120. The first end 122 is included in a first extension extending in one direction from the winding area of the coil 120 and can be intermingled with the first extension and the second end 124 is coupled to the coil 120 ), And may be mixed with the second extension portion.

The height H1 from the first area 112 to the second area 114 of the magnetic frame 110 is lower than the height H2 from the first area 112 to the coil 120. [ A portion of the inner diameter of the coil 120 may be filled with the second region 114 of the magnetic frame 110 and the remaining portion may be filled with the magnetic body 130. [ The height H1 from the first region 112 to the second region 114 of the magnetic frame 110 in this specification may be referred to as the height of the magnetic frame 110, 112 to the coil 120 can be referred to as the height of the coil 120. [

At this time, the magnetic frame 110 and the magnetic body 130 may include different materials, so that the magnetic permeability of the magnetic frame 110 and the magnetic permeability of the magnetic body 130 may be different. In particular, the magnetic permeability of the magnetic frame 110 may be higher than the magnetic permeability of the magnetic body 130. For example, the magnetic permeability 占 of the magnetic frame 110 may be five times or more the magnetic permeability 占 of the magnetic body 130. Accordingly, the inductance of the inductor 100 can be increased, and the high frequency loss of the inductor 100 can be reduced.

More specifically, as shown in Equation (1), the magnetic flux density B is proportional to the magnetic permeability 占 and the magnetic field strength H.

Accordingly, even when a current having the same magnitude flows through the coil 120 wound on the coil 120, the magnetic flux density B induced by the region having a high magnetic permeability, that is, the region filled with the magnetic frame 110, 130) than the magnetic flux density (B) induced by the region filled with the magnetic field.

The inductance L is inversely proportional to the current I and is proportional to the magnetic flux? And the magnetic flux? Increases in accordance with the magnetic flux density B, as shown in the equations (2) and (3).

Accordingly, if the inductance of the region filled with the magnetic frame 110 increases, the mutual inductance with the region filled with the magnetic body 130 increases, and the inductance of the inductor 100 increases as a whole.

According to an embodiment of the present invention, the inner diameter of the coil 120 is divided into a region filled with the magnetic frame 110 and a region filled with the magnetic body 130, and the magnetic frame 110 has a higher permeability than the magnetic body 130 The magnetic field may be distorted due to the magnetic field refraction at the boundary between the region having a high permeability and the region having a low permeability. As a result, the magnetic flux linking to the coil 120 increases and the inductance increases. Further, according to the embodiment of the present invention, the wavelength in the inner diameter of the coil 120 may be controlled. Thus, it is possible to control the cut-off frequency and the cut-off frequency for reducing the power supply noise, and high frequency loss can be prevented.

When the magnetic frame 110 having a high magnetic permeability is disposed in the inner diameter of the coil 120 according to the embodiment of the present invention, the magnetic field induced by the current flowing through the coil 120 magnetizes the magnetic frame 110 Used to consume. Accordingly, the magnetic field induced by the current flowing through the coil 120 can be shielded.

The height H1 from the first region 112 to the second region 114 of the magnetic frame 110 is greater than the height H2 from the first region 112 to the coil 120 ) ≪ / RTI > If the height H1 from the first region 112 to the second region 114 is less than 10% of the height H2 from the first region 112 to the coil 120, the effect of increasing the inductance is insignificant, %, The magnetic flux leakage to the outside of the inductor 100 may lower the shielding performance.

Table 1 shows the magnetic permeability of the magnetic frame 110, the magnetic permeability of the magnetic body 130, the height H1 from the first region 112 to the second region 114 and the height H1 from the first region 112 to the second region 114 And the height H2 from the first region 112 to the coil 120. The inductance of the first region 112 is the same as that of the first region 112,

Experiment number Of a magnetic frame
Investment ratio Magnetic
Investment ratio H1 H1 / H2 inductance
(nH) Comparative Example - 35 - - 271.5 Example 1-1 25000 35 150 25% 376.3 Examples 1-2 25000 35 150 50% 433.5 Example 1-3 25000 35 150 75% 494.7 Examples 1-4 15000 35 150 25% 383 Examples 1-5 15000 35 150 50% 443 Examples 1-6 15000 35 150 75% 496 Example 2-1 25000 35 100 25% 376.3 Example 2-2 25000 35 100 50% 433.3 Example 2-3 25000 35 100 75% 496.2 Examples 2-4 15000 35 100 25% 383 Example 2-5 15000 35 100 50% 443 Examples 2-6 15000 35 100 75% 496 Example 3-1 25000 35 50 25% 376.7 Example 3-2 25000 35 50 50% 434.5 Example 3-3 25000 35 50 75% 496.6 Example 3-4 15000 35 50 25% 383 Example 3-5 15000 35 50 50% 443 Examples 3-6 15000 35 50 75% 496

Referring to Table 1, it can be seen that, in comparison with the comparative example in which the coil is embedded in the magnetic body without the magnetic frame, the inductance of the embodiment embedded in the magnetic body after the coil is arranged on the magnetic frame is high.

In particular, as in Examples 1-1 to 1-3, H1 / H2 was increased by 25% to 75% in an inductor including a magnetic frame having a permeability of 25000 and a thickness H1 of 150 mu m and a magnetic body having a permeability of 35 H1 / H2 is 25% to 75% in an inductor including a magnetic frame having a permeability of 15000 and a thickness H1 of 150 mu m and a magnetic body having a permeability of 35 as in Examples 1-4 to 1-6, , The inductance is increased.

When the magnetic permeability of the magnetic frame and the magnetic permeability of the magnetic body were set to the same conditions as in Examples 1-1 to 1-6 as in Examples 2-1 to 2-6 and Examples 3-1 to 3-6, It can be seen that the inductance is not influenced by the height H1 of the magnetic frame but only by the ratio between the height H1 of the magnetic frame and the height H2 of the coil.

8-10 illustrate a method of manufacturing an inductor according to one embodiment of the present invention.

Referring to FIG. 8, a magnetic frame 110 is provided. The magnetic frame 110 may include a first region 112 and a second region 114 surrounded by the first region 112 and formed higher than the first region 112. Here, a plurality of the second regions 114 may be arranged at predetermined intervals.

Referring to FIG. 9, a coil 120 is disposed on a magnetic frame 110. For this, a plurality of coils, which are consecutively wound at the same interval as the interval at which the second area 112 of the magnetic frame 110 is disposed, may be sandwiched in the second area 112.

Referring to FIG. 10, a coil 120 disposed on a magnetic frame 110 is embedded in a magnetic body 130. Here, the magnetic body may include a magnetic sheet laminated in plural pieces. For example, a plurality of magnetic sheets stacked on the upper and lower portions of the magnetic frame 110 on which the coils 120 are disposed may be arranged and then heated, pressed and cured. Accordingly, the magnetic sheet flows into the inner diameter of the coil 120 and can be hardened. The magnetic sheet flowing into the inner diameter of the coil 120 can function as a magnetic core together with the second region 114 of the magnetic frame 110. [

Thereafter, the hardened magnetic body is cut to produce an inductor.

3 to 10 illustrate an example in which the magnetic substance 130 is disposed under the magnetic frame 110, but the present invention is not limited thereto. The magnetic body 130 may be disposed only on the surface on which the coil 120 is disposed, that is, only on the upper portion of the magnetic frame 110. Since the magnetic permeability of the magnetic frame 110 is higher than that of the magnetic body 130, the magnetic field directed to the lower portion of the magnetic frame 110 can be shielded. Accordingly, the inductance of the inductor 100 is not reduced, and the overall thickness of the inductor 100 can be reduced, even if the magnetic body 130 is disposed only on the top of the magnetic frame 110. [

Table 2 shows the change in inductance according to the magnetic permeability of a magnetic body (hereinafter referred to as an upper magnetic body) disposed on the upper portion of the magnetic frame 110 and a magnetic body disposed below the magnetic frame 110 This is a result.

Experiment number Of a magnetic frame
Investment ratio The upper magnetic body
Investment ratio The lower magnetic body
Investment ratio H1 H1 / H2 inductance
(nH) Comparative Example - 35 35 - - 271.5 Example 4-1 15000 35 - 50 25% 375.5 Example 4-2 15000 35 50 50 25% 376.2 Example 4-3 15000 35 100 50 25% 376.2 Example 4-4 15000 35 150 50 25% 376.2 Example 5-1 15000 30 - 50 25% 324.6 Example 5-2 15000 40 - 50 25% 426.3 Example 5-3 15000 50 - 50 25% 527.8 Examples 5-4 15000 60 - 50 25% 629.2 Example 5-5 15000 70 - 50 25% 730.3 Examples 5-6 15000 80 - 50 25% 831.3 Examples 5-7 15000 90 - 50 25% 930 Examples 5-8 15000 100 - 50 25% 1030 Examples 5-9 15000 1500 - 50 25 14200 Example 6-1 100 30 - 50 25% 260 Example 6-2 200 30 - 50 25% 280 Example 6-3 300 30 - 50 25% 300 Example 6-4 400 30 - 50 25% 306 Examples 6-5 500 30 - 50 25% 312 Examples 6-6 600 30 - 50 25% 318 Examples 6-7 700 30 - 50 25% 324 Examples 6-8 800 30 - 50 25% 324

Referring to Table 2, the magnetic permeability of the magnetic frame, the magnetic permeability of the upper magnetic body, the height H1 of the magnetic frame, the height H1 of the magnetic frame, and the height H2 of the coil ) Is the same, the inductance does not change even if the magnetic permeability of the lower magnetic body is changed, so that it is possible to omit the lower magnetic body.

The ratio of the magnetic permeability of the magnetic frame, the height H1 of the magnetic frame and the height H1 of the magnetic frame to the height H2 of the coil is the same as in Examples 5-1 to 5-9, The inductance increases as the magnetic permeability of the magnetic frame 110 increases with the permeability of the upper magnetic body.

The ratio of the magnetic permeability of the upper magnetic body, the height H1 of the magnetic frame and the height H1 of the magnetic frame to the height H2 of the coil is the same as in Examples 6-1 to 6-8, The inductance increases as the magnetic permeability of the magnetic frame 110 increases with respect to the permeability of the upper magnetic body, but it tends to be saturated at a predetermined value, for example, 700/30 or higher.

In addition, in Examples 5-1 to 5-9 and Examples 6-1 to 6-8, as shown in FIG. 11, as the ratio of the magnetic permeability of the magnetic frame to the permeability of the upper magnetic body increases, the inductance increases (See Examples 6-1 to 6-7), it is saturated at a predetermined value or more (see Examples 6-7 to 6-8), and the inductance decreases rather than the above value (Example 5- 8 to 5-1 in reverse order).

FIG. 12 shows an inductor assembly in which an inductor according to an embodiment of the present invention is mounted on a PCB.

12, the inductor assembly 900 includes a substrate 910, an electrode 920 formed on the substrate 910, an inductor 100 mounted on the electrode 920, and an inductor 100, And solder (not shown) for connecting the electrodes 920 and 920.

Here, the inductor may have the same structure as that of the inductor shown in Figs.

At this time, the first electrode 140 and the second electrode 150 of the inductor 100 may be bonded to the solder. Accordingly, the inductor 100 can be connected to the electrode 920 on the substrate 910. [

On the other hand, grooves may be formed on the bottom surface of the magnetic frame.

FIG. 13 is a bottom view of an inductor according to another embodiment of the present invention, and FIG. 14 is a sectional view of a magnetic frame with reference to a Y line in FIG. 3 to 7 will not be described again.

Referring to FIGS. 13 to 14, the magnetic frame 110 may be formed of a plurality of stacked magnetic sheets, and the grooves 116 may be formed on the bottom surface of the magnetic frame 110. The groove 116 may be formed at a position corresponding to the second region 114 and the thickness D1 of the magnetic frame 110 in the first region 112 and the thickness D1 of the magnetic frame 110 in the second region 114, ) May be the same. Here, the bottom surface 116-1 and the wall surface 116-2 of the groove 116 are shown as being at right angles, but the present invention is not limited thereto. The shape of the groove 116 can be variously modified. For example, the bottom surface 116-1 of the groove 116 may have various shapes such as a circular shape, an elliptical shape, and a polygonal shape, and the width of the groove 116 becomes wider toward the bottom surface of the groove 116, Or may be formed to be constant.

If the grooves 116 are formed in the magnetic frame 110, the grooves 116 are advantageous in the process because they can act as support grooves in the manufacturing process of the inductor. In addition, since the magnetic field is trapped in the groove 116, when the groove 116 is formed in the magnetic frame 110, the magnetic field radiated to the outside can be reduced to improve the shielding performance. 15, when the ratio D2 / D of the magnetic frame 110 to the thickness D2 in the second region 114 is smaller than the depth D of the groove 116, That is, as the depth of the groove 116 becomes deeper, the amount of change in inductance is almost zero, and the power capacity is reduced. Accordingly, when the grooves 116 are formed in the magnetic frame 110, it is advantageous to be applied in a low-power environment.

At this time, the groove 116 may be filled with a different material, for example, an insulating material. The magnetic field generated by the coil 120 is not transmitted through the magnetic frame 110 but is directed toward the magnetic body 130 so that the inductance of the inductor 100 is not affected even if the groove 116 is filled with the different material . When the grooves 116 are filled with different materials, the strength of the magnetic frame 110 can be increased.

Alternatively, the grooves 116 may be filled with magnetic powder. When the magnetic powder filled in the groove 116 has a higher magnetic permeability than the magnetic frame 110, it is possible to design an inductor having a high power capacity.

At this time, the heterogeneous material or the magnetic powder may be filled with 10 to 100% of the volume of the groove 116. Thus, it is possible to adjust the power capacity of the inductor according to the depth of the groove 116, the magnetic permeability of the magnetic powder filled in the groove 116, and the amount.

On the other hand, according to the embodiment of the present invention, conductive portions may be formed on both sides of the magnetic body.

16 shows an inductor according to another embodiment of the present invention. 3 to 7 will not be described again.

16, the inductor 100 includes a magnetic frame 110, a coil 120, a magnetic body 130, a first electrode 140, and a second electrode 150, A first region 112, and a second region 114 surrounded by the first region 112. At this time, the second region 114 may be formed higher than the first region 112.

According to the embodiment of the present invention, the first conductive part 160 formed on the first surface 132 of the magnetic body 130 and wrapped by the first electrode 140, And a second conductive portion 170 formed on a second surface 134 facing the first surface 132 and wrapped by the second electrode 150.

The first end 122 and the second end 124 of the coil 120 may be embedded in the first conductive portion 160 and the second conductive portion 170, respectively. At this time, the first conductive portion 160 and the second conductive portion 170 may include a conductive material. For example, the first conductive portion 160 and the second conductive portion 170 may be made of a cured conductive paste.

The first end portion 122 and the second end portion 124 are exposed to the outside together with the first conductive portion 160 and the second conductive portion 170, respectively. The first conductive part 160 and the second conductive part 170 surround the first end part 122 and the second end part 124. The area of the first conductive part 160 and the area of the second conductive part 160 May be larger than the exposed area of the first end portion 122 and the exposed area of the second end portion 124. The first end portion 122 and the second end portion 124 are electrically connected to the first electrode portion 150 and the second electrode portion 160 together with the first conductive portion 160 and the second conductive portion 170, The contact area is widened, so that the resistance of the coil 120 is reduced and the power transfer efficiency of the coil 120 is increased.

Here, the first surface 132, the first conductive portion 160, and the first end 122 of the magnetic body 130 may have a shape cut at the same time, and the second surface 134 of the magnetic body 130, The second conductive portion 170 and the second end portion 124 may have a shape that is cut at the same time. Accordingly, the contact efficiency between the first conductive portion 160 and the first electrode portion 140 and the contact efficiency between the second conductive portion 170 and the second electrode portion 150 can be increased.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims It can be understood that

100: inductor
110: magnetic frame
120: Coil
130: magnetic substance

Claims (15)

A first region and a second region surrounded by the first region and being formed higher than the first region,
A coil disposed on the first region and wound around the second region,
A first electrode connected to a first end of the coil,
And a second electrode connected to the second end of the coil
/ RTI >
And the height from the first region to the second region is lower than the height from the first region to the coil. The method according to claim 1,
Further comprising a magnetic body for embedding the coil,
And a part of the magnetic body is disposed in the inside diameter of the coil. 3. The method of claim 2,
Wherein the magnetic frame and the magnetic body include different materials. 3. The method of claim 2,
Wherein the magnetic permeability of the magnetic frame and the magnetic permeability of the magnetic body are different from each other. 5. The method of claim 4,
Wherein the magnetic permeability of the magnetic frame is higher than the magnetic permeability of the magnetic body. 6. The method of claim 5,
Wherein the magnetic permeability of the magnetic frame is at least five times the magnetic permeability of the magnetic body. The method according to claim 1,
Wherein the height from the first region to the second region is 10 to 90% of the height of the coil from the first region. The method according to claim 1,
And a groove is formed on a bottom surface of the magnetic frame. The method according to claim 1,
Wherein the magnetic body includes a magnetic sheet laminated in plural pieces. 10. The method of claim 9,
The magnetic sheet may be selected from the group consisting of pure iron, silicon steel sheet magnetic powder, amorphous magnetic powder, permalloy magnetic powder, HF (High Flux) magnetic powder, Sendust magnetic powder, ferrite magnetic powder, Fe- Fe-Si-Nb-Cu based magnetic powder, Fe-Si-Cr-Al based magnetic powder, Fe-Si-Cr based magnetic powder, Powder and an Fe- (Si-P-) CB-based magnetic powder. Board,
An electrode formed on the substrate,
An inductor mounted on the electrode, and
And a solder connecting the inductor and the electrode,
The inductor includes:
A first region and a second region surrounded by the first region and being formed higher than the first region,
A coil disposed on the first region and wound around the second region,
A first electrode connected to a first end of the coil,
And a second electrode connected to the second end of the coil
/ RTI >
Wherein a height from the first area to the second area is lower than a height from the first area to the coil
Inductor assembly. A method of manufacturing an inductor,
Providing a magnetic frame including a first region and a second region surrounded by the first region and being formed higher than the first region,
Disposing a coil wound around the second region on the first region of the magnetic frame, and
Embedding a coil disposed on the magnetic frame in a magnetic body
≪ / RTI > 13. The method of claim 12,
Wherein the magnetic frame includes a plurality of second regions arranged at predetermined intervals,
Wherein the coils include a plurality of coils that are consecutively wound at an interval equal to an interval in which the second region is disposed. 13. The method of claim 12,
Wherein the magnetic material comprises a magnetic sheet laminated in a plurality of sheets. 15. The method of claim 14,
Wherein the embedding step comprises:
Disposing a plurality of magnetic sheets stacked in at least one of the upper and lower portions of the magnetic frame, and
Heating and pressing the magnetic sheet
≪ / RTI >

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