KR102459952B1 - Inductor - Google Patents

Abstract

An inductor according to an embodiment of the present invention includes a wound coil, a first magnetic material disposed within an inner diameter of the coil, and a second magnetic material for embedding the coil, wherein the first magnetic material is engaged with the second magnetic material to vertically It is possible to move

Description

inductor {INDUCTOR}

The present invention relates to an inductor.

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

Recently, since miniaturization and thinning of various electronic devices, such as communication devices and display devices, have become important issues, miniaturization, thinness, and high efficiency of inductors applied to these electronic devices are required. For example, a chip inductor may be applied to a power circuit, and may serve to remove a ripple current to stabilize the output of the current. These chip inductors require high rated current, low resistance, miniaturization and thinness.

A general inductor may have 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 material.

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

1 to 2 , the winding coil 10 is cut after being embedded in the magnetic body 20 . Accordingly, the extension portion 12 of the winding coil 10 may be exposed to the surface of the magnetic body 20 to be connected to the external electrode 30 .

In this case, the inductance of the inductor may vary depending on the magnetic permeability of the magnetic material 20 or changes in the environment inside or outside the device including the same. When the inductance is changed, a deviation occurs in the performance of the inductor and the device including the same, which affects the reliability of the product.

An object of the present invention is to provide an inductor having an easy manufacturing process and excellent performance.

An inductor according to an embodiment of the present invention includes a wound coil, a first magnetic body disposed within an inner diameter of the coil, and a second magnetic body disposed around the first magnetic body, and the outer circumferential surface of the first magnetic body has a spiral The wings are placed.

A spiral blade corresponding to the spiral blade of the first magnetic material may be disposed on an inner circumferential surface of the second magnetic material to engage the first magnetic material.

The first magnetic body may have a screw shape.

The second magnetic body includes an upper portion disposed above the coil, a side portion disposed on the side of the coil, and a lower portion disposed below the coil, wherein the upper portion, the side portion and The lower arrangement may be integrally connected.

The second magnetic body may further include a support part integrally connected to the lower arrangement part and disposed at a position corresponding to the inner diameter of the coil.

At least a portion of the support part may be disposed on an inner diameter of the coil.

The support part may be disposed to be spaced apart from the first magnetic body by a predetermined distance.

The inductance may be adjusted by a distance between the first magnetic material and the support part.

A distance between the first magnetic body and the support part may be adjusted by vertical movement of the first magnetic body.

At least a portion of a gap between the first magnetic body and the support part may be filled with a resin.

The first magnetic material and the second magnetic material may be heterogeneous magnetic materials.

The first magnetic body may include a moving part having a spiral blade disposed on an outer circumferential surface, and a support part disposed under the moving part and supporting the moving part.

The moving part may be disposed to be spaced apart from the support part by a predetermined interval.

The inductance may be adjusted by the distance between the moving part and the support part.

A distance between the moving part and the support part may be adjusted by vertical movement of the moving part.

At least a portion of the gap between the moving part and the support part may be filled with a resin.

The second magnetic body may include a hole through which the first magnetic body passes.

The support part may be integrally formed with the second magnetic body.

The spiral blade of the first magnetic material may correspond to an inner circumferential surface of the coil.

An inductor device according to an embodiment of the present invention includes a substrate, an electrode formed on the substrate, an inductor mounted on the electrode, and solder connecting the inductor and the electrode, wherein the inductor is a wound coil; It includes a first magnetic body disposed within the inner diameter of the coil, and a second magnetic body disposed around the first magnetic body, and a spiral blade is disposed on an outer circumferential surface of the first magnetic body.

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

In particular, according to the embodiment of the present invention, it is possible to increase the reliability of the product by lowering the inductance deviation, and it is possible to adjust the inductance even after the production of the product is completed.

1 shows an example of a winding coil.
2 is a perspective view of a typical inductor.
3 is a perspective view of an inductor according to an embodiment of the present invention.
4 is a cross-sectional view of an inductor according to an embodiment of the present invention, and FIG. 5 is a perspective view of the magnetic material of FIG. 4 .
6 is a cross-sectional view of an inductor according to another embodiment of the present invention, and 7 is a perspective view of the magnetic material of FIG. 5 .
8 is a graph illustrating a relationship between a gap within an inner diameter of a coil and an inductance.
9 is a graph showing the deviation of inductance according to the number of inductors.
10 shows an inductor device in which an inductor is mounted on a PCB according to an embodiment of the present invention.
11 shows a system for tuning an inductor according to an embodiment of the present invention.
12 is a perspective view of an inductor according to another embodiment of the present invention.

Since the present invention can have various changes and can have various embodiments, specific embodiments are illustrated and described in the drawings. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention.

Terms including an ordinal number such as second, first, etc. may be used to describe various elements, but the elements are not limited by the terms. The above 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 the first component, and similarly, the first component may also be referred to as the second component. 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 may be directly connected or connected to the other component, but it is understood that other components may exist in between. it should be On the other hand, when it is said that a certain element is "directly connected" or "directly connected" to another element, it should be understood that the other element does not exist in the middle.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It is to be understood that this does not preclude the possibility of the presence or addition of numbers, steps, operations, components, parts, 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 a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

Hereinafter, the embodiment will be described in detail with reference to the accompanying drawings, but the same or corresponding components are given the same reference numerals regardless of the reference numerals, and the overlapping description thereof will be omitted.

3 is a perspective view of an inductor according to an embodiment of the present invention, FIG. 4 is a cross-sectional view of the inductor according to an embodiment of the present invention, FIG. 5 is a perspective view of the magnetic material of FIG. 4, and FIG. 6 is another view of the present invention It is a cross-sectional view of the inductor according to the embodiment, and 7 is a perspective view of the magnetic body of FIG. 5 .

3 to 5 , the inductor 100 includes a magnetic body 110 , a coil 120 embedded in the magnetic body 110 , and a first electrode 130 disposed on the first surface 112 of the magnetic body 110 . and a second electrode 140 disposed on a second surface 114 opposite to the first surface 112 of the magnetic body 110 .

The magnetic body 110 may have a three-dimensional shape such as a cylinder or a prism. Here, the magnetic body 110 includes a powder of a metal alloy having soft magnetic properties, pure iron, silicon steel sheet magnetic powder, amorphous magnetic powder, permalloy magnetic powder, HF (High Flux) magnetic powder, sendust magnetic powder, ferrite. magnetic powder and the like. For example, the magnetic material 110 may include Fe-Si-B-based magnetic powder, Fe-Ni-based magnetic powder, Fe-Si-based magnetic powder, Fe-Si-Al-based magnetic powder, Fe-Ni-Mo-based magnetic powder, It may include at least one selected from the group consisting of Fe-B-Si-Nb-Cu-based magnetic powder, Fe-Si-Cr-Al-based magnetic powder, and Fe-(Si-P-)C-B-based magnetic powder.

Alternatively, the magnetic body 110 may include a magnetic sheet stacked in plurality. When the magnetic body 110 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. In this case, the magnetic sheet includes powder of a metal alloy having soft magnetic properties, pure iron, silicon steel sheet magnetic powder, amorphous magnetic powder, permalloy magnetic powder, HF (High Flux) magnetic powder, sendust magnetic powder, ferrite magnetic powder and the like. For example, the magnetic sheet may include Fe-Si-B magnetic powder, Fe-Ni magnetic powder, Fe-Si magnetic powder, Fe-Si-Al magnetic powder, Fe-Ni-Mo magnetic powder, Fe- A polymer binder consisting of a resin and at least one selected from the group consisting of B-Si-Nb-Cu-based magnetic powder, Fe-Si-Cr-Al-based magnetic powder, and Fe-(Si-P-)C-B-based magnetic powder. can

The magnetic sheet may have a thickness of, for example, 0.01 to 1 mm or less.

The coil 120 includes a winding region 122 , and includes a first extension region 124 and a second extension region 126 extending integrally with the winding region 122 . In addition, the first extension region 124 may be connected to the first electrode 130 through the first surface 112 of the magnetic material 110 , and the second extension region 124 is the second surface of the magnetic material 110 . It may be connected to the second electrode 140 through 114 . Here, the first extension region 124 and the second extension region 126 illustrate cut ends of the coil 120 , but are not limited thereto. When the first extension region 124 and the second extension region 126 are respectively rolled and then bent to face the first surface 112 and the second surface 114, the first electrode 130 and the second electrode ( 140) can increase the contact area. Alternatively, when the ends of the first extension region 124 and the second extension region 126 are buried in a conductive part including a conductive material and then cured and cut, the conductive part is the first electrode 130 and the second electrode 140 . ), so the contact area can be widened. When the contact area between the coil and the electrode is increased, the resistance of the coil is reduced, and the power transfer efficiency of the coil is increased.

Here, the coil 120 shows an example in which a flat conductor wire is wound in two layers, but is not limited thereto. Conductive wires having various cross-sectional shapes and thicknesses may be wound in various methods such as a helical shape and an α-helical shape, and may be wound in a single layer or a multilayer.

According to an embodiment of the present invention, the magnetic body 110 is disposed around the first magnetic body 200 and the first magnetic body 200 disposed within the inner diameter of the coil 120 , and the second magnetic body 110 is embedded in the coil 120 . and a magnetic body 300 . The first magnetic body 200 is engaged with the second magnetic body 300 to move up and down.

In order for the first magnetic body 200 to be engaged with the second magnetic body 300 and move up and down, a spiral blade 202 engaged with the inner circumferential surface of the second magnetic body 300 may be formed on the outer circumferential surface of the first magnetic body 200 . have. The first magnetic body 200 may have, for example, a screw shape. That is, a groove 204 into which a screw driver can be inserted may be formed in the head portion of the first magnetic body 200 . Accordingly, the first magnetic body 200 is movable up and down by a screw driver.

When the first magnetic body 200 moves upward, the inner-diameter gaps Gap and G of the coil 120 increase, and when the first magnetic body 200 moves downward, the inner-diameter gap of the coil 120 decreases. . Since magnetic energy is stored in the gap within the inner diameter of the coil 120 , the inductance and the current capacity can be adjusted by adjusting the size of the gap. That is, the gap within the inner diameter of the coil 120 and the inductance have a relationship as in the graph shown in FIG. 8 . Accordingly, by adjusting the size of the gap, the inductance of the inductor can be adjusted.

In addition, even if the inductor is manufactured using the same manufacturing equipment, variations in inductance may occur. The deviation of inductance according to the number of inductors is the same as the graph shown in FIG. 9 . For example, when an inductance of 1 nH is designed, an actually mass-produced inductor has a distribution of 0.8 nH to 1.2 nH. In this case, the plurality of inductors can be tuned to have the same inductance by finely adjusting the gap within the inner diameter of the coil 120 by moving the first magnetic body 200 of the manufactured inductor up and down.

The rate of change of inductance is proportional to the rate of change of the Henry value and inversely proportional to the rate of change of the gap as shown in Equation 1 below.

[Equation 1]

ΔI= ΔH/ ΔG

where ΔI is the rate of change of inductance, ΔH is the rate of change of the Henry value, and ΔG is the rate of change of the gap. The rate of change of the gap can be expressed as in Equation 2 below.

[Equation 2]

ΔG = d*cosθ

Here, d is the interval of the spiral blades formed on the outer surface of the first magnetic body 200, and θ is the slope of the spiral blades.

More specifically, referring to FIGS. 4 to 5 , the second magnetic body 300 includes an upper part 312 disposed on the coil 120 and a side part 314 disposed on the side of the coil 120 . and a lower arrangement part 316 disposed under the coil 120 , wherein the upper arrangement part 314 , the side arrangement part 316 , and the lower arrangement part 318 may be integrally connected. In this case, since the upper arrangement part 312 , the side arrangement part 314 , and the lower arrangement part 318 bury the coil 120 , it may be referred to as a buried part. In addition, the second magnetic body 300 may further include a support part 320 formed integrally with the lower arrangement part 318 and disposed at a position corresponding to the inner diameter of the coil 120 . In this case, at least a portion of the support part 320 may be disposed within the inner diameter of the coil 120 , and may be disposed to be spaced apart from the first magnetic body 200 by a predetermined interval. The space formed by the buried part and the support part 320 may be a groove 330 for accommodating the first magnetic body 200 .

In order for the first magnetic body 200 to be engaged with the second magnetic body 300 and move up and down, a spiral blade 302 that engages with the outer circumferential surface of the first magnetic body 200 is also formed on the inner circumferential surface of the second magnetic body 300 . have.

On the other hand, the inductance is adjusted by the distance G between the lower portion of the first magnetic material 200 and the support portion 320, and the gap G between the lower portion of the first magnetic material 200 and the support portion 320 is the first magnetic material ( 200) can be adjusted by moving up and down.

The gap G between the lower portion of the first magnetic material 200 and the support portion 320 may be an empty space, that is, a void, but may also be filled with resin. Here, the resin is, for example, a naturally-cured resin such as an acrylic resin, a polyester resin, or a silicone resin, and may have adhesive performance. When the gap G between the lower part of the first magnetic body 200 and the support part 320 is filled with the resin, the gap G between the lower part of the first magnetic body 200 and the support part 320 can be more stably maintained. have.

Here, the first magnetic material 200 and the second magnetic material 300 may be the same type of magnetic material or different types of magnetic material. When the first magnetic material 200 and the second magnetic material 300 are different types of magnetic material, the magnetic permeability of the first magnetic material 200 and the magnetic permeability of the second magnetic material 300 may be different from each other. The inductance of the inductor 100 may vary according to the magnetic permeability of the first magnetic material 200 and the magnetic permeability of the second magnetic material 300 . According to an embodiment of the present invention, the inductance of the inductor 100 may be adjusted by changing the type of the detachable first magnetic material 200 .

As another embodiment, referring to FIGS. 6 to 7 , the first magnetic body 200 includes a moving part 210 in which a spiral blade 202 engaged with the second magnetic body 300 is disposed on the outer circumferential surface, and the moving part 210 ) and may include a support part 220 for supporting the moving part 210 . In addition, the moving unit 210 and the supporting unit 220 may be spaced apart from each other by a predetermined interval, and the gap G between the moving unit 210 and the supporting unit 220 may be a void, but may be filled with resin. Here, the resin is, for example, a naturally-cured resin such as an acrylic resin, a polyester resin, or a silicone resin, and may have adhesive performance. When the gap G between the lower part of the moving part 210 and the supporting part 220 is filled with resin, the gap G between the lower part of the moving part 210 and the supporting part 220 may be more stably maintained.

When the first magnetic body 200 includes the moving part 210 and the supporting part 220 , a hole 330 for accommodating the first magnetic body 200 may be formed in the second magnetic body 300 .

That is, as in the embodiment of FIGS. 4 to 5 , the support part disposed on the inner diameter of the coil 120 is integrally connected with the second magnetic body 300 and included in the second magnetic body 300 , or the embodiment of FIGS. 6 to 7 . For example, the support portion disposed on the inner diameter of the coil 120 may be separated from the second magnetic body 300 and included in the first magnetic body 200 .

10 shows an inductor device in which an inductor is mounted on a PCB according to an embodiment of the present invention.

Referring to FIG. 10 , the inductor device 900 includes a substrate 910 , an electrode 920 formed on the substrate 910 , an inductor 100 mounted on the electrode 920 , and the inductor 100 and the electrode ( 920) and a solder (not shown) for connecting them.

Here, the inductor may have the same structure as the inductor shown in FIGS. 3 to 7 .

In this case, the first electrode 130 and the second electrode 140 of the inductor 100 may be bonded to the solder. Accordingly, the inductor 100 may be connected to the electrode 920 on the substrate 910 .

An inductor according to an embodiment of the present invention may be tuned automatically.

11 shows a system for tuning an inductor according to an embodiment of the present invention.

Referring to FIG. 11 , the LCR meter 1000 is connected to both ends of the inductor 100 to measure the inductance, and the result is transmitted to the signal processing unit 1010 .

The signal processing unit 1010 may set the rotation direction, the number of rotations, and the RPM of the first magnetic body 200 in the inductor 100 according to the measurement result of the LCR meter 1000 . For example, as a result of the measurement of the LCR meter 1000, if the inductance is 3% lower, the first magnetic material 200 is set to rotate 0.5 in the right direction at RPM 0.2, and when the inductance is 5% lower, the first magnetic material 200 is rotated. Set to rotate 0.8 in the right direction at RPM 0.2, set the first magnetic body 200 to rotate 0.5 in the left direction at RPM 0.2 when the inductance is 3% high, and rotate the first magnetic body 200 when the inductance is 5% high It can be set to rotate 0.8 to the left at 0.2 RPM. In this case, the number of rotations and RPM may vary depending on the spacing and angle of the spiral blades formed on the outer surface of the first magnetic body 200 .

The driving unit 1020 moves the first magnetic body 200 by driving according to the result of the signal processing unit 1010 . To this end, the driving unit 1020 may be a screw driver including a motor, and the screw driver may be inserted into the groove 204 formed in the head of the first magnetic material 200 to move the first magnetic material 200 up and down. .

Accordingly, it is possible to tune the inductance deviation of mass-produced inductors, and it is possible to adjust the inductance when the inductance is reduced according to the use of the product.

Meanwhile, in the above description, the embodiment in which the first magnetic body 200 is engaged with the second magnetic body 300 and moves up and down is mainly described, but the present invention is not limited thereto.

According to another embodiment of the present invention, the first magnetic body may move up and down in engagement with the coil.

12 is a perspective view of an inductor according to another embodiment of the present invention. The same content as those of FIGS. 3 to 11 will be omitted from overlapping descriptions.

Referring to FIG. 12 , the inductor 100 includes a magnetic material 110 , a coil 120 embedded in the magnetic material 110 , a first electrode 130 disposed on the first surface 112 of the magnetic material 110 , and a magnetic material. and a second electrode 140 disposed on a second side 114 opposite the first side 112 of 110 .

According to an embodiment of the present invention, the magnetic body 110 includes the first magnetic body 200 disposed within the inner diameter of the coil 120 . The first magnetic body 200 is engaged with the inner circumferential surface of the coil 120 to move up and down.

In order for the first magnetic body 200 to be engaged with the inner circumferential surface of the coil 120 to move up and down, a spiral blade 202 engaged with the inner circumferential surface of the coil 120 may be formed on the outer circumferential surface of the first magnetic body 200 . For example, when the coil 120 is wound in a vertical helical shape, spiral blades corresponding to the vertical helical shape of the coil 120 may be formed on the outer peripheral surface of the first magnetic body 200 .

In this case, the magnetic body 110 may further include a second magnetic body 300 disposed around the first magnetic body 200 . The second magnetic material 300 includes an upper portion disposed above the coil 120 , a side portion disposed on the side of the coil 120 , and a lower portion disposed below the coil 120 , and the upper portion The portion, the side arrangement and the lower arrangement may be integrally connected. In this case, the upper portion, the side portion, and the lower portion may fill portions of the upper portion, the side portion, and the lower portion of the coil, respectively.

Although the above has been described with reference to preferred embodiments of the present invention, those skilled in the art can variously modify and change the present invention within the scope without departing from the spirit and scope of the present invention as set forth in the claims below. You will understand that it can be done.

100: inductor
110: magnetic material
120: coil

Claims (20)

wound coil,
a first magnetic body disposed within the inner diameter of the coil; and
and a second magnetic body disposed around the first magnetic body,
A spiral blade is disposed on the outer circumferential surface of the first magnetic body,
The first magnetic material is an inductor including a moving part having a spiral blade disposed on an outer circumferential surface, and a support part disposed under the moving part and supporting the moving part. According to claim 1,
A spiral blade corresponding to the spiral blade of the first magnetic material is disposed on an inner circumferential surface of the second magnetic material to engage the first magnetic material. 3. The method of claim 2,
The first magnetic body is a screw-shaped inductor. According to claim 1,
The second magnetic body includes an upper portion disposed above the coil, a side portion disposed on the side of the coil, and a lower portion disposed below the coil, wherein the upper portion and the side portion and an inductor integrally connected to the lower arrangement portion. delete delete delete delete delete delete According to claim 1,
The first magnetic material and the second magnetic material are different magnetic inductors. delete According to claim 1,
The moving part is an inductor that is spaced apart from the support part by a predetermined distance. 14. The method of claim 13,
An inductor whose inductance is controlled by a distance between the moving part and the support part. 15. The method of claim 14,
The distance between the moving part and the support part is adjusted by the vertical movement of the moving part in the inductor. According to claim 1,
At least a portion of a gap between the moving part and the support part is filled with a resin. According to claim 1,
The second magnetic material is an inductor including a hole through which the first magnetic material passes. delete According to claim 1,
The spiral blade of the first magnetic material corresponds to an inner circumferential surface of the coil in an inductor. Board,
an electrode formed on the substrate;
an inductor mounted on the electrode, and
a solder connecting the inductor and the electrode;
The inductor is
wound coil,
a first magnetic body disposed within the inner diameter of the coil; and
and a second magnetic body disposed around the first magnetic body,
A spiral blade is disposed on the outer circumferential surface of the first magnetic body,
The first magnetic body includes a moving part having a spiral blade disposed on an outer circumferential surface, and a support part disposed under the moving part and supporting the moving part
inductor device.

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