KR20210085122A - Toroidal core - Google Patents

Abstract

A technical idea disclosed in the present specification relates to a toroidal-shaped core. Provided, in an exemplary embodiment disclosed in the present specification, is the toroidal core comprising: a body provided in a ring shape forming an appearance of the toroidal core; a first surface forming an outer circumferential surface of the body and forming a first height; a second surface forming an inner circumferential surface of the body and forming a second height; and a side surface part that connects the first surface and the second surface, wherein the second height is formed smaller than that of the first height. Therefore, the present invention is capable of reducing unnecessary waste of space that may occur.

Description

Troidal Core {TOROIDAL CORE}

The technical idea published herein relates to a toroidal-shaped core.

The inductor mainly uses a solenoid wrapped in an insulating material such as copper or aluminum and wound several times in the shape of a screw, or a magnetic core is inserted into a coil wound around a wire.

The inductor refers to a passive element manufactured in the form of winding a wire around a coil or a core in which the wire is wound according to the purpose of various electronic circuits by using the characteristic that energy is stored in the field of a magnetic field generated by the flow of current. .

In addition, when the current changes with time, the inductor's intrinsic constant in relation to the voltage across the inductor is called inductance, and the inductance value varies according to the material and shape of the inductor.

And the core of the inductor is made of a magnetic material, and is called a toroidal core, an EER core, an EE core, an ER core, an EQ core, a PQ core, an EI core, etc. depending on the shape. Among the cores having various shapes, the EER core, EE core, ER core, EQ core, PQ core, EI core, etc. may be a magnetic core assembly formed by assembling at least two magnetic cores.

The toroidal core is formed in a ring shape. Therefore, as the Troidel core is provided in a hollow ring shape, the circumference of the inner diameter is formed smaller than the circumference of the outer diameter.

A coil is wound a predetermined number of times on the outer peripheral surface of the toroidal core. However, as described above, since the inner and outer diameters of the toroidal core are different, when the coil is wound a plurality of times, a portion where the windings are stacked occurs at the inner diameter, thereby increasing the overall height of the inductor and also generating unnecessary dead space.

In addition, since the toroidal core is lifted from the bottom by the coils stacked in the inner diameter, there is a problem in that heat transfer efficiency is lowered even when the toroidal core is molded in a separate inductor case.

Accordingly, various embodiments published by this document aim to solve the above-described problem.

One of the various problems of the present specification is to solve the above-mentioned problem through the improved structure of the toroidal core.

One of the various tasks of the present specification is to reduce the height difference between the height of the coil stacked on the inner diameter side of the toroidal core and the coil stacked on the outer diameter side of the toroidal core even when the coil is wound on the toroidal core a plurality of times. do.

The present specification provides various embodiments as follows in order to solve the various problems posted in the present specification.

An exemplary embodiment of the present specification provides a toroidal core having an improved structure capable of reducing the overall core height when winding the coil by modifying the shape of the core formed from the outside to the inside of the toroidal core.

An exemplary embodiment of the present specification provides an asymmetric structure of the toroidal core that can increase the AL-value while preventing the overall volume increase due to wire lamination of the inner diameter of the toroidal core.

An exemplary embodiment of the present specification is provided in a ring shape to form a body forming the exterior of the toroidal core and an outer circumferential surface of the body, forming a first surface forming a first height and an inner circumferential surface of the body, It provides a toroidal core comprising a second surface forming a second height and a side portion connecting the first surface and the second surface, wherein the second height is formed smaller than the first height.

The side portion may include an inclined portion that connects one end of the first surface and the second surface and is inclined downwardly from the first surface to the second surface, and the side portion is parallel to the first surface It may include an extended flat portion, and the inclined portion may be formed from an end of the flat portion to one end of the second surface.

In addition, the side portion may include a third surface connecting one end of the first surface and the second surface, and a fourth surface connecting the other ends of the first surface and the second surface.

Preferably, the third surface and the fourth surface may include an inclined portion inclined downward from the first surface to the second surface, and the inclined portion is based on an axis perpendicular to the first height or the second height. As a result, the third surface and the fourth surface may be symmetrically formed.

In addition, the third surface and the fourth surface may include a flat portion extending in parallel from the first surface, and the inclined portion may be formed from an end of the flat portion to one end of the second surface, and the third surface may include a flat portion extending in parallel from the first surface. The surface and the fourth surface may be formed symmetrically with respect to an axis perpendicular to the first height or the second height.

Each feature of the above-described embodiments may be implemented in combination in other embodiments as long as they are not contradictory or exclusive to other embodiments.

According to various embodiments disclosed herein, the volume of the entire system can be reduced by reducing the height compared to the toroidal core on which the conventional coil is wound. Accordingly, it is possible to reduce unnecessary space wastage that may occur when the coil is wound a plurality of times.

According to various embodiments disclosed herein, when the coil is wound around the toroidal core, the Mean Length Path (MLP) of the winding decreases, thereby reducing the resistance value.

According to various embodiments disclosed herein, in forming an inductance targeted by a user, the number of turns of the coil may be reduced, thereby reducing the overall mass production cost.

Effects of the present invention are not limited to those described above, and other effects not mentioned will be clearly recognized by those skilled in the art from the following description.

1 is a view showing an inductor in which a coil is wound on a toroidal core.
2 is a view showing a cross-section of a core according to an embodiment disclosed herein.
3 is a view showing a cross-section of a core according to an embodiment disclosed herein.
4 is a view showing a cross-section in which a coil is wound on a core having various structures.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. The following detailed description is provided to provide a comprehensive understanding of the methods, apparatus, and/or systems described herein. However, this is merely an example and the present invention is not limited thereto.

In describing the embodiments of the present invention, if it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. In addition, the terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to intentions or customs of users and operators. Therefore, the definition should be made based on the content throughout this specification. The terminology used in the detailed description is for the purpose of describing embodiments of the present invention only, and should in no way be limiting. Unless explicitly used otherwise, expressions in the singular include the meaning of the plural. In this description, expressions such as “comprising” or “comprising” are intended to indicate certain features, numbers, steps, acts, elements, some or a combination thereof, and one or more other than those described. It should not be construed to exclude the presence or possibility of other features, numbers, steps, acts, elements, or any part or combination thereof.

In addition, in describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the component from other components, and the essence, order, or order of the component is not limited by the term.

1 is a view showing an inductor in which a coil is wound on a toroidal core.

Hereinafter, a conventional inductor 1 will be described with reference to FIG. 1 .

The inductor 1 includes a core 5 and a coil 3 wound around the core 5 .

The coil 3 may be formed of a conductive wire whose surface is coated with an insulating material. The conductive wire may be made of copper, silver, aluminum, gold, nickel, tin, etc. whose surface is coated with an insulating material, and the cross-section of the conductive wire may have a circular or prismatic shape.

Both ends of the coil 3 may be connected to an electrode (not shown). Accordingly, the coil 3 may include lead wires 31 and 33 , and the lead wires 31 and 33 may be connected to the electrodes (not shown). Of course, the direction in which the coil is drawn out may vary depending on the direction in which the coil is wound around the core.

The coil 3 surrounds a region of the core 5 and generates magnetic flux according to the flow of current. When a current flows through the coil 3 , a magnetic field having a polarity is generated according to the current and the direction in which the conductor is wound, and the energy of the current is temporarily stored in the form of a magnetic field.

The magnetic flux generated in the coil 3 passes along the body of the magnetic iron core in which the coil 3 surrounds one region, and the inductance characteristics of the inductor are different depending on the nature of the medium (magnetic iron core) through which the magnetic flux passes. it is decided

The core 5 may include pure iron or Fe-based magnetic powder. Fe-based magnetic powder includes, for example, 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, At least one selected from the group consisting of Fe-Si-B-based magnetic powder, Fe-Si-C-based magnetic powder, and Fe-B-Si-Nb-Cu-based magnetic powder may be included, but is not limited thereto.

To this end, a part of the core 5 may be manufactured by coating pure iron or Fe-based magnetic powder with a ceramic or polymer binder and then insulating and molding at high pressure. Alternatively, a part of the core 5 may be manufactured by laminating a plurality of magnetic sheet layers obtained by insulating after coating pure iron or Fe-based magnetic powder with a ceramic or polymer binder.

Alternatively, a part of the core 5 may include ferrite powder. The ferrite powder may be, for example, a Ni-Zn-based ferrite powder or a Mn-Zn-based ferrite powder. To this end, a part of the core 5 may be manufactured by coating the ferrite powder with a ceramic or polymer binder and then insulating and molding at a high pressure.

Alternatively, a part of the core 5 may be manufactured by laminating a plurality of magnetic sheet layers obtained by insulating after coating ferrite powder with a ceramic or polymer binder.

That is, the core 5 may be made of a material that forms various magnetic materials for guiding the magnetic flux generated in the coil.

The core 5 may be provided in a hollow ring shape. That is, the hole 6 is formed in the central portion of the core 5 so that the core 5 may be provided as a kind of toroidal core.

A fillet 51 may be formed at an edge portion of the core 5 . The fillet 51 prevents the coil 3 wound around the core 5 from being damaged. In more detail, if the edge of the core 5 is sharp, it may be damaged by tension when winding the wire around the core. Therefore, the fillet 51 is provided to the edge of the core 5 to prevent the wire from being damaged.

The fillet 51 does not change the overall shape of the core, but provides a kind of worn surface to prevent the wire from being damaged when the wire is wound around the core. Accordingly, although the shape of the corner portion of the core is slightly changed by the fillet, it does not affect the overall shape change of the core.

In the case of the above-described conventional inductor core, when the wire is wound around the core, the inner diameter defined by the hole 6 and the outer diameter defined by the outer circumferential surface of the core 5 have different lengths, so that the coil 3 is wound a plurality of times. When the coil is stacked on the inner diameter side, there may be a problem in that the overall height of the inductor 1 is increased. In addition, as the height of the inductor increases, heat transfer efficiency to the core decreases, and thus, the performance of the inductor may be deteriorated.

Figure 2 is a view showing a cross-section of the core of one embodiment published in the present specification, Figure 3 is a view showing a cross-section of the core of one embodiment published in the present specification.

Hereinafter, it will be described with reference to FIGS. 2 and 3 .

The toroidal core 100 of this embodiment is provided in a ring shape to form a body 100a forming the outer appearance of the toroidal core, and an outer circumferential surface of the body 100a and a first surface forming a first height 111 . (110) and a second surface 130 forming an inner circumferential surface of the body 100a and forming a second height 131, and a side portion connecting the first surface 110 and the second surface 130 ( 150).

The first surface 110 forms the outer surface of the toroidal core 100 , and the second surface 130 is formed as the toroidal core 100 is provided in a ring shape. It forms the circumferential surface of the hole.

The side part 150 may refer to the upper surface and lower surface of the toroidal core 100 in this embodiment. The side part 150 includes a third surface 151 connecting one end of the first surface 110 and one end of the second surface 130 , and the other end of the first surface 110 and the second surface ( 130) and a fourth surface 153 connecting the other end.

The side portion 150 may include an inclined portion 1513 inclined downward from the first surface 110 to the second surface 130 . The inclined portion 1513 may form a part of the side portion 150 . Alternatively, the inclined portion 1513 may correspond to the side portion 150 . When the inclined portion 1513 corresponds to the side portion 150 , the inclined portion 1513 may form a downward slope from one end of the first surface 110 to one end of the second surface 130 . have.

When the inclined portion 1513 forms a part of the side portion 150 , the side portion 150 may include a flat portion 1531 extending in parallel from the first surface 110 . In addition, the inclined portion 1513 may be formed from an end of the flat portion 1531 to one end of the second surface 130 .

As the side portion 150 forms a downward slope as described above, the first height 111 of the first surface 110 may be the same as the overall height of the toroidal core 100 .

The third surface 151 and the fourth surface 153 may be provided symmetrically with respect to an axis L perpendicular to the first height 111 or the second height 131 . That is, the flat portion 1511 and the inclined portion 1513 of the third surface may be symmetrical to the flat portion 1531 and the inclined portion 1533 of the fourth surface with respect to the vertical axis L.

Due to the above-described structure, the toroidal core 100 of the present embodiment may be provided in an asymmetrical shape in which the height is lowered toward the inner diameter. As the toroidal core 100 is provided in an asymmetrical shape, a magnetic flux path f is formed relatively close to the second surface 130 . That is, the magnetic flux f is formed close to the inner diameter side of the toroidal core 100 .

In the case of a toroidal core having a quadrangular cross-section, which is not asymmetrical as in the present embodiment, magnetic flux is formed at the center of the inner and outer diameters. As the present embodiment is provided in an asymmetric form in which the height is lowered toward the inner diameter of the toroidal core, the magnetic flux f is formed close to the inner diameter side with respect to the central portion of the inner diameter and the outer diameter.

That is, the length of the magnetic flux f is reduced in the present embodiment compared to the toroidal core having a quadrangular core cross-section. As the length of the magnetic flux f decreases, the AL-value increases, so that the number of turns of the wire to match the inductance desired by the user may be reduced. Therefore, there is an effect of reducing the overall mass production cost for producing the inductor.

And as the number of turns of the wire increases, the wires are stacked on the inner diameter side of the toroidal core, causing a problem that the overall height of the inductor increases. can be solved

Therefore, it is preferable that the second height 131 of the present embodiment is smaller than the first height 111 . In addition, a side portion having an inclination formed from both ends of the first surface to both ends of the second surface by the difference in height is provided.

3, the coil wound on the toroidal core 100 is a coil 31 stacked on the outer diameter side, a coil 35 stacked on the inner diameter side, and a coil 33 stacked between the outer diameter and the inner diameter. It can be separated for convenience.

As the inclined portions 1513 and 1533 are provided, the second height 131 is formed to be smaller than the first height 111 , and thus the coil 35 and the second height 131 stacked on the inner diameter side. ) may be equal to the sum of the coil 31 stacked on the outer diameter side and the first height 111 . In this case, the maximum height of the inductor may be formed in the portion of the coil 33 stacked between the outer diameter and the inner diameter.

Of course, in order to make the total height of the outer diameter side and the inner diameter side of the toroidal core the same after the coil is wound, the side part may be formed to correspond to the inclined part as described above.

However, when the side portion is formed to correspond to the inclined portion, after the coil is wound on the core, the inner and outer diameter sides of the core are formed to have the same height, and at the same time, the height of the inner diameter and the outer diameter side can be the maximum height of the inductor. However, in this case, the number of turns of the coil is reduced compared to the present embodiment. It will be described in more detail with reference to FIG. 4 .

4 is a view showing a cross-section in which a coil is wound on a core having various structures.

Hereinafter, it will be described with reference to FIG.

4(a) is a view showing a cross-section in which a coil is wound on a core having a rectangular cross-section without an inclined portion as in the present embodiment. Referring to FIG. 4( a ), when the coil is wound on the core a plurality of times, the coil 35a is laminated on the second surface 130a side, and the total height of the coil 31a wound on the first surface 110a side is higher than the total height. formed higher. Accordingly, the height of the inner diameter side is higher than the outer diameter side of the core.

4(b) is a view showing a cross-section in which a coil is wound around a core when only the inclined portion 150b is formed on the side surface as described above. Referring to FIG. 4B , when the coil is wound on the core a plurality of times, the first surface 110b and the second surface 130b may have the same height. Accordingly, the height of the outer diameter side and the inner diameter side of the core may be the same.

However, in this case, the number of turns of the wire is reduced compared to the shape of FIG. 4(c), and thus the efficiency of the inductor is inevitably low according to FIG. 4(c). If the wire is wound with the same number of turns as the core in which the flat part and the inclined part are formed as shown in FIG. 4(c), the total height of the inner diameter side of the core is higher than the total height of the core outer diameter side as shown in FIG. 4(a). Problems can arise.

In this way, when more cores are stacked on the inner-diameter side so that the total height of the inner-diameter side is higher than the total height of the outer-diameter side, the overall volume of the inductor and durability of the coil may be weakened. This is because the wire in contact with the core from the inner diameter side of the core due to the tension during winding of the wire has a structure in which it cannot but receive a relatively large load. In addition, when the wire is wound a plurality of times while in contact with each other on the inner diameter side of the core, the surface of the coil may be peeled off, thereby weakening the insulation performance.

4(c) is a view showing a cross-section in which a coil is wound on a core having an asymmetrical cross-section as in the present embodiment. In the present embodiment, the wire may be wound with a greater number of turns than that of FIG. 4(b), and when the coil is wound on the core, the inner diameter and the outer diameter of the core may have the same height.

Although various embodiments of the present invention have been described in detail above, those of ordinary skill in the art will understand that various modifications are possible without departing from the scope of the present invention with respect to the above-described embodiments. . Therefore, the scope of the present invention should not be limited to the described embodiments and should be defined by the claims described below as well as the claims and equivalents.

100: toroidal core 110: first side
130: second side 151: third side
153: fourth surface 1511,1531: flat part
1513,1533: inclined part 31,33,35: coil

Claims (8)

a body provided in a ring shape to form an outer appearance of the toroidal core;
a first surface forming an outer circumferential surface of the body and forming a first height;
a second surface forming an inner circumferential surface of the body and forming a second height; and
and a side portion connecting the first surface and the second surface.
The second height is a toroidal core, characterized in that formed smaller than the first height. According to claim 1,
The side portion connects one end of the first surface and the second surface, and an inclined portion that is inclined downwardly from the first surface to the second surface; toroidal core comprising a. 3. The method of claim 2,
The side portion includes a planar portion extending in parallel from the first surface,
The toroidal core, characterized in that the inclined portion is formed from the end of the flat portion to one end of the second surface. According to claim 1,
The side part,
a third surface connecting one end of the first surface and the second surface; and
A toroidal core comprising a; a fourth surface connecting the other ends of the first surface and the second surface 5. The method of claim 4,
The third side and the fourth side are
A toroidal core comprising a; an inclined portion inclined downwardly from the first surface to the second surface. 6. The method of claim 5,
The inclined portion is a toroidal core, characterized in that formed symmetrically to the third surface and the fourth surface with respect to an axis perpendicular to the first height or the second height. 6. The method of claim 5,
The third side and the fourth side are
Including; a flat portion extending in parallel from the first surface;
The toroidal core, characterized in that the inclined portion is formed from the end of the flat portion to one end of the second surface. 8. The method of claim 7,
The third surface and the fourth surface are toroidal core, characterized in that symmetrical with respect to an axis perpendicular to the first height or the second height.

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