JP2021019141A - Composite inductor, electric and electronic apparatus, and manufacturing method of composite inductor - Google Patents

Abstract

To suppress a temperature difference between respective inductors occurring in operation, by easily making the ohmic values of the inductors uniform, while reducing the mounting areas of the inductors.SOLUTION: A composite inductor 100 comprises plural inductors 101 and intermediate shield parts 102 provided between the inductors 101. Each of the inductors 101 includes: a core 103 obtained by binding magnetic powder with a binding agent; a coil body 104 constituted of a conductor wound inside the core 103; and a terminal 106 conducting to each end of the coil body 104 and extending toward a mounting face P. The intermediate shield parts 102 has a higher magnetic permeability than each core 103. The winding axes of the coil bodies 104 are aligned along an axis parallel to the mounting face P.SELECTED DRAWING: Figure 1

Description

The present invention relates to a composite inductor, an electric / electronic device, and a method for manufacturing a composite inductor.

With the miniaturization and higher functionality of electrical and electronic devices, high-density mounting of substrates mounted on electrical and electronic devices is strongly desired. For example, Patent Document 1 describes a method for reducing the mounting area of a plurality of inductors. Coil parts are listed.

The coil component described in Patent Document 1 is formed by powdering a magnetic material, covering the surface with an insulating film, mixing a binder, and press-molding the magnetic core, a coil embedded in the magnetic core, and connecting or extending the coil. , A terminal portion protruding from the magnetic core is provided.

Further, Patent Document 1 describes that in a multi-phase circuit having a plurality of DC-DC circuits, a plurality of coils are laminated and arranged in the same direction in the vertical direction and embedded in a magnetic core. There is. In this case, the terminal portions of the coils are extended in opposite directions to protrude from the magnetic core, and are arranged so as to be staggered with the terminal portions of the adjacent upper and lower coils so as not to overlap each other. Be made.

According to Patent Document 1, in a plurality of DC-DC circuits, the functions of a plurality of coil components can be obtained with one coil component as compared with the conventional case, the number of coil components used can be reduced, and the mounting area can be reduced. It is said that.

Japanese Unexamined Patent Publication No. 2005-64319

In the coil component described in Patent Document 1, as described above, a plurality of coils are laminated and arranged in the same direction in the vertical direction in the winding axis direction. According to this coil component, it is considered that the mounting area can be reduced as compared with the parallel arrangement in which a plurality of coils are arranged side by side on a mounting surface such as a board in a state where a plurality of coils are oriented in the same direction perpendicular to the winding axis direction. ..

However, when a coil component is applied to a multi-phase circuit, for example, it is desirable that the resistance values of the coil and each set of terminals connected to the coil are equal in order to balance the current values output from each terminal.

In the coil component described in Patent Document 1, the distance to the mounting surface differs between the coil arranged above and the coil arranged below, and the length of the terminal portion connected to each coil also differs according to the distance. Become a thing. Therefore, it is difficult to equalize the resistance values of the terminals connected to the upper and lower coils. That is, in the coil component described in Patent Document 1, there is a problem that it is difficult to make the resistance values of the inductors equal.

Further, a general inductor has a characteristic that the inductance changes according to the temperature. Therefore, for example, if a temperature difference occurs during operation of a plurality of inductors constituting a multi-phase circuit, an imbalance may occur in the current waveform output through each coil.

In the coil component described in Patent Document 1, for example, when mounted on a substrate, the coil arranged below is in contact with or close to the substrate, and the coil arranged above is separated from the substrate. Therefore, while the heat from the coils arranged below is easily released through the substrate, the heat from the coils arranged above is not easily released, and a temperature difference is likely to occur between the upper and lower coils and the magnetic cores around them. Conceivable. That is, the coil component described in Patent Document 1 has a problem that a temperature difference is likely to occur in each inductor during operation.

The present invention has been made in view of such circumstances, and while reducing the mounting area of a plurality of inductors, the resistance value of each inductor is easily made uniform, and the temperature difference of each inductor that occurs during operation can be reduced. It is an object of the present invention to provide a method for manufacturing a composite inductor, an electric / electronic device, and a composite inductor that can be suppressed.

In order to achieve the above object, the composite inductor according to the first aspect of the present invention is
Conducting to each of the core to which the magnetic powder is bound with a binder, the coil body composed of the conductor wound inside the core, and the end portion of the coil body toward the mounting surface. Multiple inductors, each containing an extending terminal,
It has a higher magnetic permeability than each of the cores, and includes a shield portion provided between the plurality of inductors.
The coil body is arranged along a uniaxial axis whose winding shaft is parallel to the mounting surface.

In order to achieve the above object, the electrical and electronic equipment according to the second aspect of the present invention is
Includes the composite inductors described above.

In order to achieve the above object, the method for manufacturing a composite inductor according to the third aspect of the present invention is
By arranging a coil body in which a conductor is wound inside a kneaded product of magnetic powder and a binder and press-molding the kneaded product, it conducts to each end of the coil body. Making multiple inductors with terminals extending toward the mounting surface,
A shield portion having a higher magnetic permeability than the core in which the kneaded product is pressure-molded is provided between the plurality of inductors arranged so that the winding shafts of the coil body are lined up along one axis parallel to the mounting surface. Including that.

According to the present invention, it is possible to easily make the resistance value of each inductor uniform and suppress the temperature difference of each inductor that occurs during operation while reducing the mounting area of a plurality of inductors.

It is a perspective view of the composite inductor which concerns on Embodiment 1 of this invention. FIG. 5 is an exploded perspective view of a composite inductor in which a part of the components according to the first embodiment is in a state before molding. It is a flowchart which shows the manufacturing method of the composite inductor which concerns on Embodiment 1 of this invention. It is a perspective view of the composite inductor which concerns on Embodiment 2 of this invention. FIG. 5 is an exploded perspective view of a composite inductor in which a part of the components according to the second embodiment is in a state before molding. It is a flowchart which shows the manufacturing method of the composite inductor which concerns on Embodiment 2 of this invention. FIG. 5 is a perspective view showing an example of two inductors mounted in parallel on a mounting surface of a substrate according to Comparative Example 1. FIG. 5 is a perspective view showing an example of two inductors mounted in a laminated arrangement on a mounting surface of a substrate according to Comparative Example 2.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The same elements are given the same reference numerals throughout the figure. Further, in the description and drawings of the embodiments of the present invention, the terms upper, lower, front, rear, left, and right are used, but these are used to explain the direction and limit the present invention. Not the purpose.

<Embodiment 1>
(Structure of Composite Inductor 100)
The composite inductor 100 according to the first embodiment of the present invention is an electronic component including a plurality of inductors 101, and is suitably applied to a multi-phase circuit or the like. As shown in the perspective view of FIG. 1 and the exploded perspective view of FIG. 2, the composite inductor 100 includes two inductors 101 and three shield portions 102.

However, in FIG. 2, the drawer portion 105 and the terminal portion 106, which will be described in detail later, are shown as the drawer member 110 and the terminal member 111 before they are connected to each other.

The composite inductor 100 is mounted on a mounting surface P to be mounted such as a substrate, and is provided in an electric / electronic device (not shown). The electric / electronic device is a device operated by electric power, and includes home appliances, industrial electric devices, medical devices, information devices, digital devices, and the like.

Each of the plurality of inductors 101 has the same configuration, and includes a core 103, a coil main body 104, left and right drawer portions 105, and left and right terminal portions 106.

The core 103 is formed by binding magnetic powder with a binder. The shape of the core 103 may be appropriately determined, but in the present embodiment, it is generally a rectangular parallelepiped forming a square when viewed from the front. Also, the thickness of the core 103 is smaller than its height.

Here, the thickness means the length in the front-rear direction, and the height means the length in the up-down direction, and the same applies to the following.

The magnetic material powder is a soft magnetic material powder whose surface is appropriately covered with an insulating film. As the soft magnetic material, for example, Fe alloys such as Fe—Si—Cr alloys, Fe—Si—Al alloys and Fe—Si alloys, Ni alloys, Co alloys and the like are preferably adopted. The shape of the magnetic powder is flat, spherical, or the like.

The binder of the core 103 binds the magnetic powder. The material of the binder of the core 103 is a thermosetting resin or the like, and an appropriate additive may be added.

The coil body 104 is composed of a conductor wound inside the core 103. The conductor is copper, aluminum, silver, etc., and the same applies to the following. The conductor constituting the coil main body 104 according to the present embodiment is a round wire.

The winding shafts of the coil main body 104 are arranged along the front-rear shafts. Here, the front-rear axis is an axis that faces the front-rear direction, and is an example of one axis that is parallel to the mounting surface P. Further, "arranging along the front-rear axis" means that they are substantially arranged on the front-rear axis, and the same applies to the following.

The left and right drawing portions 105 are conductors provided substantially symmetrically on the left and right sides of the coil main body 104, and are portions for pulling out each of the end portions of the coil main body 104 to the outside of the core 103.

Specifically, each of the drawers 105 includes a buried portion provided inside the core 103 and an exposed portion exposed to the outside of the core 103.

For each of the drawers 105, the embedded portion extends between the end of the coil body 104 and the outer surface of the core 103. In the present embodiment, the drawer portion 105 is composed of the vicinity of the end portion of the round wire conductor constituting the coil main body 104 and the vicinity of the end portion of the drawer member 110 described later, and these are connected by soldering, welding, or the like. ing. Further, the exposed portion has a flat plate shape having a planar spread and is connected to the terminal portion 106.

Here, the vicinity of the end means a predetermined range from the end. For example, the vicinity of the end of the round wire conductor constituting the coil body 104 means from the end of the coil body 104 to the end of the entire round wire conductor.

More specifically, the left drawer portion 105 extends from one end of the coil body 104 to the upper left and extends to the left from the connection portion connected by soldering or the like to the outside from the left side surface of the core 103. It is exposed to. For the left drawer 105, the embedded portion is connected to one end of the coil body 104 and extends to the left. Further, the exposed portion of the left drawer portion 105 is a flat plate-shaped portion that is bent or curved from the left end of the embedded portion and extends rearward, and the right surface is connected to the left terminal portion 106. ..

The right drawing portion 105 extends substantially upward from the other end of the coil body 104 and extends to the right from the connecting portion connected by soldering or the like so as to be exposed to the outside from the right side surface of the core 103. There is. For the right drawer 105, the embedded portion is connected to the other end of the coil body 104 and extends to the right. Further, the exposed portion of the right drawer portion 105 is a flat plate-shaped portion that is bent or curved from the right end of the embedded portion and extends rearward, and the left surface is connected to the right terminal portion 106. ..

The left and right terminal portions 106 are conductors for connecting the coil main body 104 to the circuit of the mounting surface P or the like, and are conductive to each of the end portions of the coil main body 104 and extend toward the mounting surface P.

The left and right terminal portions 106 according to the present embodiment are electrically connected to the end portions of the coil main body 104 via the left and right drawer portions 105, and are provided substantially symmetrically on the outside of the core 103.

Specifically, each of the terminal portions 106 includes an extending portion 107 and a mounting portion 108.

The extending portion 107 is a portion extending downward toward the mounting surface P, and is provided along the outer surface of the core 103. The extending portion 107 has a connecting portion 109 for connecting the drawer portion 105.

The connecting portion 109 according to the present embodiment forms vertically elongated slits that are open upward. The drawer portion 105 is provided so as to penetrate the connecting portion 109, and is connected to the extending portion 107 in a plane by bending a portion located outside the connecting portion 109 toward the rear. The drawer portion 105 and the extension portion 107 may be fixed by soldering, welding, or the like.

Here, the outer direction is a direction in which they are separated from each other, and the same applies to the following. For example, the outside of the left and right drawer portions 105 is to the left in the left drawer portion 105 and to the right in the right drawer portion 105.

The mounting portion 108 is a portion for fixing to a circuit or the like on the mounting surface P by soldering or the like, and is curved or bent from the extending portion 107 and extends inward along the mounting surface P.

Here, the inside is a direction approaching each other, and the same applies to the following. For example, the inside of the left and right terminal portions 106 is to the right for the left terminal portion 106 and to the left for the right terminal portion 106.

More specifically, with respect to the left terminal portion 106, a rectangular flat plate-shaped extending portion 107 extends downward along the left side surface of the core 103, and a left drawer portion 105 is inserted into the connecting portion 109. It is installed. Further, the rectangular flat plate-shaped mounting portion 108 is curved or bent from the lower end of the extending portion 107 and extends to the right along the lower surface of the core 103.

Regarding the right terminal portion 106, a rectangular flat plate-shaped extending portion 107 extends downward along the right side surface of the core 103, and a right drawing portion 105 is inserted into the connecting portion 109. Further, the rectangular flat plate-shaped mounting portion 108 is curved or bent from the lower end of the extending portion 107 and extends to the left along the lower surface of the core 103.

Each of the plurality of shield portions 102 is a flat plate-shaped member for reducing the influence of the magnetic flux generated during the operation of the inductor 101 on the periphery, and at least one main surface is arranged perpendicular to the front-rear axis. It is opposed to the inductor 101. The thickness of each of the shield portions 102 is, for example, 20% or more and 40% or less of the thickness of the core 103.

Each of the shield portions 102 is formed by binding, for example, a magnetic flat powder whose surface is covered with an insulating film with a binder, and has a higher magnetic permeability than each of the core 103. The in-plane magnetic permeability of each main surface of the shield portion 102 is preferably, for example, 200 or more and 300 or less.

The magnetic material flat powder contained in the shield portion 102 is a flat powder, and for example, the above-mentioned soft magnetic material is used as a material. Further, the material of the binder contained in the shield portion 102 is a thermosetting resin or the like, and an appropriate additive may be added.

The main surface of the shield portion 102 according to the present embodiment is a square having substantially the same size as the surface of the core 103 facing each other. By facing the shield portion 102 and the core 103 on surfaces having substantially the same size and shape in this way, the peripheral surfaces (surfaces facing up, down, left, and right) of the composite inductor 100 can be made substantially flush with each other.

Specifically, the plurality of shielded portions 102 includes one intermediate shielded portion 102 and two end shielded portions 102.

The intermediate shield portion 102 is provided between the plurality of inductors 101.

The end shield portion 102 is provided at the end of the plurality of inductors 101 along the front-rear axis. In other words, the end shield portion 102 is provided at the front end and the rear end of the entire composite inductor 100. It should be noted that one or both of the end shield portions 102 may not be provided.

When the "intermediate shield portion 102" and the "end shield portion 102" are not particularly distinguished, they are also simply referred to as "shield portion 102" below.

So far, the configuration of the composite inductor 100 according to the first embodiment of the present invention has been described. From here, a method for manufacturing a composite inductor according to the present embodiment will be described.

(Manufacturing method of composite inductor 100)
The method for manufacturing the composite inductor according to the present embodiment is a method for manufacturing the composite inductor 100, and will be described with reference to FIG. 3 showing the flow thereof.

The method of manufacturing a composite inductor starts after a predetermined number of materials are prepared. The materials prepared in the present embodiment include, for example, a magnetic powder and a binder as a material for the core 103, a magnetic flat powder as a material for the coil body 104, a drawer member 110, a terminal member 111, and a shield portion 102. It is a binder.

Here, the coil main body 104 is prepared by winding a round wire conductor with a predetermined inner diameter along the winding shaft a predetermined number of times. Further, the drawer member 110 and the terminal member 111 are flat plate-shaped members for forming each of the drawer portion 105 and the terminal portion 106, and are flat plates of a conductor such as metal cut out into a predetermined shape. .. For example, the terminal member 111 has a rectangular flat plate shape provided with a connecting portion 109.

As shown in FIG. 3, a kneaded product of the magnetic powder and the binder is prepared. The kneaded product is pressure-molded into a predetermined shape with the coil main body 104 in which the drawer member 110 is connected to each end thereof is arranged inside. As a result, the core 103 in which the coil main body 104 is embedded is manufactured (step 101).

Specifically, the vicinity of the end of the round wire conductor constituting the coil body 104 and the vicinity of the end of the drawer member 110 are electrically fixed to each other by being connected by soldering, welding, or the like. The entire round wire conductor constituting the coil body 104 and a part (embedded portion) of the drawer member 110 are arranged in the kneaded material in a state of being fixed to each other, and the remaining portion (exposed portion) of the drawer member 110 is It is placed outside the smelt. Then, the kneaded product is, for example, pressurized in the winding axis direction of the coil body 104 to be formed into a rectangular parallelepiped shape having a substantially square main surface.

As a result, the core 103 and the embedded portion of the coil main body 104 and the drawer portion 105 arranged inside the core 103 are formed. The embedded portion of the drawer portion 105 according to the present embodiment is formed from the vicinity of the end portion of the round wire conductor constituting the coil main body 104 and a part of the drawer member 110.

Terminal members 111 are arranged on the left and right outer surfaces of the core 103 (step 102). At this time, the terminal member 111 may be arranged while inserting the exposed portion of the drawer member 110 into the connecting portion 109. As a result, the extending portion 107 is provided.

The terminal member 111 may be fixed to the outer surface of the core 103 with an adhesive or the like.

The drawer member 110 is bent so that the exposed portion protruding outward from the connecting portion 109 faces rearward. At this time, the exposed portion of the drawer member 110 may be bent so as to come into contact with the extending portion 107, and may be fixed to the extending portion 107 by soldering, welding, or the like. As a result, the exposed portion of the drawer portion 105 is formed, and the drawer portion 105 and the extending portion 107 are connected to each other (step 103).

The terminal member 111 is bent inward so that the vicinity of the lower end portion protruding below the lower surface of the core 103 is along the lower surface of the core 103. As a result, the mounting portion 108 is formed (step 104).

The step 104 may be performed before the step 103. That is, according to the shape of the core 103, the vicinity of the lower end portion of the terminal member 111 protruding downward from the lower surface of the core 103 is pre-bent, and the pre-bent terminal member 111 is placed on the left and right outer surfaces of the core 103. It may be arranged. Further, the mounting portion 108 may be fixed to the lower surface of the core 103 with an adhesive or the like.

The inductor 101 is manufactured through steps 101 to 104.

In the inductor 101, each of the terminal portions 106 is formed by bending a rectangular flat plate-shaped terminal member 111, and therefore has a length in a direction along the front-rear axis. In the present embodiment, the lengths of the terminal portion 106 and the core 103 in the front-rear direction are substantially the same.

Steps 101 to 104 are repeated a number of times according to the number of inductors 101 included in the composite inductor 100 (step 105). Since the composite inductor 100 according to the present embodiment includes two inductors 101, the second inductor 101 is manufactured by further repeating steps 101 to 104.

The shield portion 102 is produced by pressure molding a kneaded product such as a soft body flat powder and a binder. In this embodiment, three shield portions 102 are manufactured (step 106).

Specifically, for example, a slurry prepared by dissolving it in a solvent together with a soft body flat powder whose surface is covered with an insulating film, a binder, a thickener and the like is produced. A shielding sheet is produced by applying the slurry to a resin sheet, drying it, peeling it off from the resin sheet, and cutting it into a predetermined shape. A flat plate for shielding is produced by stacking a plurality of shielding sheets and performing heating / pressurizing treatment. By adhering and laminating a plurality of shielding flat plates with an adhesive, a shield portion 102 having a predetermined thickness is produced.

One of the shield portions 102 manufactured in step 106 is fixed between the two inductors 101 manufactured by step 105 with an adhesive or the like. At this time, the inductor 101 is arranged so that the winding shaft of the coil main body 104 is aligned with the front-rear shaft. As a result, the intermediate shield portion 102 is provided (step 107), and the two inductors 101 are connected.

The rest of the shield portion 102 manufactured in step 106 is fixed to each end surface (each of the front surface and the rear surface) of the entire two inductors 101 integrated in step 107 with an adhesive or the like. As a result, the end shield portion 102 is provided (step 108), and the composite inductor 100 is manufactured.

So far, Embodiment 1 of the present invention has been described.

(Action / effect)
According to the present embodiment, the coil main body 104 has a winding shaft arranged along the front-rear shaft. Generally, the thickness of the inductor 101 is smaller than its width (length in the left-right direction). Therefore, the mounting area is smaller than that of arranging a plurality of inductors in which the winding shaft of the coil body 104 is oriented perpendicular to the mounting surface P in parallel on the mounting surface P.

Further, since the intermediate shield portion 102 can suppress the increase in the magnetic coupling between the cores 103, the distance between the inductors 101 can be made relatively small.

Therefore, it is possible to reduce the mounting area of the plurality of inductors 101.

Further, since the winding shafts of the coil main body 104 are arranged so as to be arranged along the front-rear shafts, the distances from the end portion to the mounting surface P of each of the coil main bodies 104 can be made substantially equal. Therefore, by mounting the coil body 104 on the mounting surface P from each end portion via the terminal portion 106 or the like, it is possible to easily make the resistance values of the inductors 101 substantially equal.

Therefore, the resistance value of each inductor 101 can be easily made uniform.

Further, the winding shafts of the coil main body 104 are arranged so as to be lined up along the front-rear shafts, and a surface parallel to the front-rear shafts is designated as a mounting surface P. Therefore, at the time of mounting, all the inductors 101 can be arranged in contact with or close to the mounting surface P. As a result, all the inductors 101 can dissipate heat through the mounting target, so that the heat dissipation of the inductor 101 can be improved and the temperature rise can be suppressed. When the temperature rise is suppressed, the temperature difference of the inductor 101 is also usually suppressed.

Therefore, it is possible to suppress the temperature difference of each inductor 101 during operation.

According to this embodiment, each of the terminal portions 106 is provided outside the core 103.

The terminal portion 106 is composed of a conductor, and the conductor usually has a high thermal conductivity. Therefore, the heat generated from the coil main body 104 can be discharged to the outside through the terminal portion 106, and the heat dissipation of the inductor 101 can be improved.

Therefore, it is possible to further suppress the temperature difference of each inductor 101 during operation.

According to this embodiment, each of the terminal portions 106 includes an extending portion 107 and a mounting portion 108.

Since the extending portion 107 extends along the outer surface of the core, heat generated from the coil body 104 can be discharged to the outside from the extending portion 107 through the core 103 or a conductor.

Therefore, the heat dissipation can be improved, and the temperature difference between the inductors 101 during operation can be further suppressed.

Further, the mounting portion 108 extends along the mounting surface P. This makes it possible to easily mount the composite inductor 100 on the mounting target.

According to the present embodiment, each of the terminal portions 106 has a length in the direction along the front-rear axis, and thus has a planar spread. The conductor usually has a high thermal conductivity, and heat generated from the coil body 104 can be released to the outside through the surface formed by the terminal portion 106. Therefore, the heat dissipation can be further improved.

Therefore, it is possible to further suppress the temperature difference of each inductor 101 during operation.

According to the present embodiment, the exposed portion of the drawer portion 105 has a planar spread. Therefore, the heat generated from the coil main body 104 can be efficiently transmitted to the drawer portion 105 through the conductor or the core 103, and can be efficiently discharged to the outside from the drawer portion 105. Thereby, the heat dissipation property can be further improved.

Therefore, it is possible to further suppress the temperature difference of each inductor 101 during operation.

According to the present embodiment, the end shield portion 102 is provided at the end of the entire plurality of inductors 101 in the direction along the front-rear axis.

As a result, since the end portion of the composite inductor 100 is formed by the end shield portion 102, the influence of the magnetic flux generated on the composite inductor 100 during operation is less likely to affect the elements mounted around the composite inductor 100. Therefore, the element or the like can be mounted closer to the composite inductor 100 than when the end shield portion 102 is not provided.

Therefore, high-density mounting is possible for the entire mounting target.

Further, when the thermal conductivity of the end shield portion 102 is large, it is possible to improve the heat dissipation.

According to the present embodiment, the shield portion 102 is formed by binding magnetic flat powder whose surface is covered with an insulating film with a binder. By adopting such a shield portion 102, the filling rate of the magnetic powder can be higher than that of each inductor 101, so that the shield portion 102 having a high magnetic permeability can be obtained. Further, since the filling rate of the magnetic powder can be increased, the thermal conductivity of the shield portion 102 can be increased, and the heat dissipation from the shield portion can be improved.

According to the present embodiment, the thickness of the shield portion 102 is 20% or more and 40% or less of the core 103.

If the shield portion 102 is too thin, the magnetic coupling between the cores 103 cannot be sufficiently weakened. Further, if the shield portion 102 is too thick, the composite inductor 100 becomes large and the mounting area increases.

By setting the thickness of the shield portion 102 to 20% to 40% of the thickness of the core 103, it is possible to reduce the mounting area while sufficiently weakening the magnetic coupling between the cores 103.

According to the present embodiment, the shield portion 102 has a flat plate shape, is provided perpendicular to the front-rear axis, and has an in-plane magnetic permeability of 200 or more and 300 or less. In this way, by arranging the main surface of the flat plate-shaped shield portion 102 perpendicular to the front-rear axis and setting the in-plane magnetic permeability to 200 or more and 300 or less, the magnetic coupling between the cores is sufficiently weakened. , It becomes possible to reduce the mounting area.

According to this embodiment, the electrical and electronic equipment includes the composite inductor 100. This makes it possible to provide an electric / electronic device that exhibits the actions and effects of the composite inductor 100 described above.

<Embodiment 2>
In the first embodiment, an example in which the composite inductor 100 includes two inductors 101 has been described. However, the number of inductors included in the composite inductor may be three or more.

Further, in the first embodiment, an example in which the coil main body 104, the drawer portion 105, and the terminal portion 106 are composed of a round wire conductor constituting the coil main body 104, a drawer member 110, and a terminal member 111 has been described. .. However, a part or all of the coil body, the drawer portion, and the terminal portion may be integrally formed, or many other members may be connected to each other. Further, one or both of the pair of terminal portions may be provided inside the core 103, and in this case, each may be arranged on the left and right sides of the coil body, and the drawer portion may not be provided.

Further, the shape and the like of the shield portion may be changed as appropriate.

In the present embodiment, an example in which these are different from the first embodiment will be described. In the present embodiment, in order to simplify the explanation, the parts different from those in the first embodiment will be mainly described, and duplicate explanations will be omitted as appropriate.

(Configuration of Composite Inductor 200)
The composite inductor 200 according to the present embodiment includes three inductors 201 and four shield portions 202, as shown in the perspective view of FIG. 4 and the exploded perspective view of FIG.

However, in FIG. 5, the drawer portion 205 and the terminal portion 206, which will be described in detail later, are shown as the drawer protrusion 213 and the terminal member 211 before they are molded, respectively.

Each of the plurality of inductors 201 has the same configuration, and includes a core 103 similar to that of the first embodiment, a coil body 204 different from that of the first embodiment, left and right drawer portions 205, and left and right terminal portions 206. Including.

The coil body 204 is composed of a conductor wound inside the core 103, as in the first embodiment. The conductor constituting the coil body 204 is a flat conductor in the present embodiment. That is, the coil body 204 is composed of a flat-wise wound curved plate-shaped conductor. The winding shaft of the coil main body 204 is arranged along the front-rear shaft as in the first embodiment.

Each of the left and right drawing portions 205 is a conductor provided substantially symmetrically on each of the left and right sides of the coil main body 104, as in the first embodiment, and the end portion of the coil main body 204 is pulled out to the outside of the core 103.

Unlike the first embodiment, each of the drawer portions 205 according to the present embodiment is integrally formed with the coil main body 204. Specifically, each of the drawer portions 205 is formed by bending or bending a flat conductor extending from an end portion of the coil main body 204 and rolling it.

Each of the drawer portions 205 has a buried portion provided inside the core 103 and extending between the end portion of the coil main body 204 and the outer surface of the core 103, and the core 103 having a flat plate shape having a planar spread. Includes exposed parts exposed to the outside of the.

Specifically, with respect to the left drawer 205, the embedded portion is appropriately bent or curved from one end of the coil body 204 to extend to the left, and the exposed portion is bent or curved from the left end of the embedded portion. The right side is connected to the left terminal part 206.

With respect to the right drawer 205, the embedded portion is appropriately bent or curved from one end of the coil body 204 to extend to the left, and the exposed portion is bent or curved from the left end of the embedded portion to extend rearward. The right side is connected to the left terminal part 206.

Each of the left and right terminal portions 206 is a conductor for connecting the coil main body 204 to the circuit of the mounting surface P or the like, as in the first embodiment, and is conductively mounted on each of the end portions of the coil main body 204. Extends towards surface P.

The left and right terminal portions 206 according to the present embodiment are electrically connected to the end portions of the coil main body 204 via the left and right drawer portions 205, and are provided substantially symmetrically on the outside of the core 103.

Specifically, each of the terminal portions 206 includes an extension portion 207 different from that of the first embodiment and a mounting portion 108 similar to that of the first embodiment.

The extending portion 207 has a connecting portion 209 for connecting the drawer portion 205, and the shape of the connecting portion 209 is different from that of the first embodiment. Except for this point, the extending portion 207 is configured in substantially the same manner as the extending portion 107 according to the first embodiment.

The connecting portion 209 according to the present embodiment forms a vertically elongated rectangular through hole. Similar to the first embodiment, the drawer portion 205 is provided so as to penetrate the connecting portion 209, and the portion located outside the connecting portion 209 is bent rearward to form the extending portion 207. It is connected by a surface.

Each of the plurality of shield portions 202 is a member for reducing the influence of the magnetic flux generated during the operation of the inductor 201 on the periphery, as in the first embodiment, and at least one main surface is with respect to the front-rear axis. It is arranged vertically and is opposed to the inductor 201.

In the present embodiment, each of the shield portions 202 has a through hole portion 212 forming a substantially columnar hole penetrating in the front-rear direction at a substantially center of the main surface. Further, in the present embodiment, the plurality of shield portions 202 include two intermediate shield portions 202 provided between the plurality of inductors 201 and two end shield portions 202 provided at the front end and the rear end of the composite inductor 100. And include. Except for these points, the shield portion 202 is configured in the same manner as the shield portion 102 according to the first embodiment.

The diameter of the through hole portion 212 as viewed from the front may be appropriately determined, but in the present embodiment, it is the same as the inner diameter of the coil main body 204.

So far, the configuration of the composite inductor 201 according to the second embodiment of the present invention has been described. From here, a method for manufacturing a composite inductor according to the present embodiment will be described.

(Manufacturing method of composite inductor 200)
The method for manufacturing the composite inductor according to the present embodiment is a method for manufacturing the composite inductor 201, and will be described with reference to FIG. 6 showing the flow thereof.

The method of manufacturing a composite inductor starts after a predetermined number of materials are prepared. The materials prepared in the present embodiment are, for example, a magnetic powder and a binder as a material for the core 103, a magnetic flat powder and a binder as a material for the coil body 204, the terminal member 211, and the shield portion 202. ..

Here, the coil main body 204 is prepared by flatwise winding a flat conductor with a predetermined inner diameter along the winding shaft a predetermined number of times. The flat conductor extending from each end of the coil main body 204 is rolled into a drawer protrusion 213 (see FIG. 5) which forms a flat plate and protrudes in a direction away from the coil main body 204.

The drawer protrusion 213 is a portion for forming the drawer portion 205, and has a substantially rectangular flat plate shape.

The terminal member 211 is a flat plate-shaped member for forming the terminal portion 206, and is a flat plate of a conductor such as metal cut out in a predetermined shape. In the present embodiment, the connection portion 209 is provided. It is a rectangular flat plate.

As shown in FIG. 6, a core 103 in which the coil main body 204 is embedded is manufactured (step 201). In the present embodiment, a part (embedded portion) of the flat plate-shaped drawer protrusion 213 integrated with the coil main body 204 is arranged in the kneaded product, and the remaining portion (exposed portion) of the drawer protrusion 213 is the mixed product. Placed outside the wrought product. Except for this point, step 201 is substantially the same as step 101 according to the first embodiment. As a result, the core 103 and the embedded portion of the coil main body 204 and the drawer portion 205 arranged inside the core 103 are formed.

Terminal members 211 are arranged on the left and right outer surfaces of the core 103 in substantially the same manner as in step 102 according to the first embodiment (step 202). At this time, the terminal member 211 is arranged while inserting the exposed portion of the drawer protrusion 213 into the connection portion 209. As a result, the extending portion 207 is provided.

Similar to step 103 according to the first embodiment, the drawer protrusion 213 is bent so that the portion protruding outward from the connection portion 209 faces rearward. As a result, the exposed portion of the drawer portion 205 is formed, and the drawer portion 205 and the extending portion 207 are connected to each other (step 203).

Similar to step 104 according to the first embodiment, the mounting portion 108 is formed by bending the vicinity of the lower end portion of the terminal member 211 inward along the lower surface of the core 103 (step 204).

The inductor 201 is manufactured through steps 201 to 204. In addition, step 204 may be performed before step 203.

Steps 201 to 204 are repeated a number of times according to the number of inductors 201 included in the composite inductor 200 (step 205). In the present embodiment, two more inductors 201 are manufactured by repeating steps 201 to 204 two more times.

The shield portion 202 is produced by pressure molding a kneaded product such as a soft body flat powder and a binder in substantially the same manner as in step 106 according to the first embodiment. In this embodiment, four shield portions 202 are manufactured (step 206).

The method for manufacturing the shield portion 202 according to the present embodiment is substantially the same as the method for manufacturing the shield portion 102 according to the first embodiment. In the present embodiment, the shield portion 202 is manufactured by providing the through hole portion 212 by machining the shield portion 102 in which a plurality of shield flat plates are laminated and adhered.

One shield portion 202 manufactured in step 206 is arranged between each of the three inductors 201 manufactured up to step 205 and fixed with an adhesive or the like. At this time, the inductor 201 is arranged so that the winding shafts of the coil main body 204 are arranged along the front-rear shafts. As a result, the intermediate shield portion 202 is provided (step 207), and the three inductors 201 are connected.

The rest of the shield portion 202 manufactured in step 206 is fixed to each end surface (each of the front surface and the rear surface) of the entire three inductors 201 integrated in step 207 with an adhesive or the like. As a result, the end shield portion 202 is provided (step 208), and the composite inductor 200 is manufactured.

So far, Embodiment 2 of the present invention has been described.

(Action / effect)
The present embodiment also has the same actions and effects as those of the first embodiment.

Further, according to the present embodiment, each of the coil main bodies 204 is composed of a flat-wise wound curved plate-shaped conductor. As a result, the coil main body 204 and the drawer portion 205 can be connected to the coil main body 104 and the drawer portion 105 according to the first embodiment by a wider path than the drawer portion 105, so that the heat dissipation can be further improved.

Therefore, it is possible to further suppress the temperature difference of each inductor 201 during operation.

According to the present embodiment, each of the shield portions 202 includes a through hole portion 212 centered on the front-rear axis.

Since the magnetic field of the inductor 201 is mainly formed so as to circulate inside and outside the coil body 204, even if the shield portion 202 is provided with the through hole portion 212, the magnetic coupling between the cores 103 can be sufficiently weakened. it can. Further, when the thermal conductivity of the shield portion 202 is small, the heat dissipation from the shield portion 202 can be improved by providing the through hole portion 212. Further, by providing the through hole portion 212 in the shield portion 202, the material used for the shield portion 202 can be reduced, and the weight and price can be reduced.

Therefore, it is possible to improve heat dissipation, reduce weight, and reduce price while sufficiently weakening the magnetic coupling between the cores 103.

From here, the composite magnetic bodies 100 and 200 according to more specific examples (examples) of the composite magnetic bodies 100 and 200 according to the above-described embodiment will be described.

(Example 1)
The composite inductor 100 according to the first embodiment is a more specific example of the composite inductor 100 according to the first embodiment.

The magnetic powder used as the material for the core 103 according to this embodiment is an Fe—Si—Cr alloy having an average particle size of 10 to 20 μm (micrometer). The binder used as the material of the core 103 is an epoxy-based thermosetting resin.

The coil body 104 according to this embodiment is formed by winding a copper wire having a diameter of 0.5 mm (millimeters) covered with a polyamide-imide insulating film for 20 turns with an inner diameter of 2.0 mm.

The drawer member 110 according to the present embodiment is a copper plate having a lead frame terminal having a width of 8 mm (including a portion having a width of 4 mm) and a thickness of 0.25 mm. By welding the lead frame terminal of the drawer member 110 to the end of the coil body 104, each end of the coil body 104 is connected to the drawer member 110.

The terminal member 111 according to the present embodiment is a copper plate having a width of 5 mm, a length of 13 mm, and a thickness of 0.25 mm, which has a connecting portion 109 forming a slit having a width of 0.3 mm.

The magnetic flat powder used as the material of the shield portion 102 according to this embodiment is a gas atomized powder of a Fe—Si—Al alloy (Sendust) having an average particle diameter of 55 μm flattened using a ball mill. Specifically, the magnetic flat powder is obtained by forging the powder for 8 hours and then heat-treating the powder at 700 ° C. (degrees) for 3 hours in a nitrogen atmosphere.

The binder used as the material for the shield portion 102 according to this embodiment is a methylphenyl-based silicone resin. Further, in this embodiment, the solvent and the thickener used when producing the shield portion 102 are ethanol and polyvinyl butyral, respectively.

The composite inductor 100 according to this embodiment is manufactured through each step shown in FIG.

Specifically, in step 101, a coil in which a drawer member 110 is connected to each end inside a kneaded product which is a powder obtained by mixing a binder and a magnetic powder in an unheated state in which the binder is not completely cured. The kneaded product is pressure-molded with the main body 104 arranged. The pressurizing condition here is 5.0 to 10.0 t / cm ² . As a result, the core 103 in which the coil main body 104 is embedded is produced, and the outer shape thereof is a substantially square shape of 10 mm × 10 mm and a thickness of 5 mm when viewed from the front.

After the core 103 is dried under the condition of 150 ° C., in the step 102, the terminal member 111 is arranged and adhered to the left and right outer surfaces of the core 103 while inserting the drawer member 110 into the connecting portion 109. The adhesive is an epoxy resin adhesive having high thixophilicity and little resin flow, and the same applies to the following.

In step 103, the exposed portion of the drawer member 110 is bent rearward and fixed to the extending portion 107 by soldering. Further, in the step 104, the mounting portion 108 is formed by bending the vicinity of the lower end of the terminal member 111 inward along the lower surface of the core 103.

By repeating such steps 101 to 104 twice, two inductors 101 are manufactured.

In step 106, three shield portions 102 are manufactured.

Specifically, a solvent, a thickener and a binder are mixed with the prepared magnetic flat powder to prepare a slurry. A premolded product is prepared by applying a slurry on a PET (polyethylene terephthalate) film by the die slot method, drying at 60 ° C. for 1 hour to remove the solvent, and peeling it from the PET film. By cutting the premolded body using a die, a plurality of square shield sheets having a length and width of 10 mm are produced. Shielding sheets are laminated and placed in a mold, and pressure molding is performed at a pressure of 200 MPa for 1 hour at a temperature of 150 ° C. to prepare a flat plate for shielding having a thickness of 0.5 mm. Then, the shield portions 102 having a thickness of 2 mm are produced by adhering the shielding flat plates to each other with an adhesive and laminating them. The magnetic flat powder is oriented in the in-plane direction (direction in the main surface) of the premolded body.

In step 107 and step 108, the three shield portions 102 produced in step 106 are fixed by being adhered between the two inductors 101 and to each of the front end and the rear end thereof with an adhesive. As a result, the composite inductor 100 according to this embodiment is manufactured.

The composite inductor 100 according to the first embodiment is mounted on a substrate, an AC voltage of 10 V (volt) -50 Hz (hertz) is applied to one inductor 101, and an induced voltage to the other inductor 101 is measured for coupling. The coefficient was calculated. The coupling coefficient of the composite inductor 100 according to the first embodiment was about 0.014.

At this time, the mounting area of the composite inductor 100 according to the first embodiment was about 164 mm ² .

Here, the mounting area is the area occupied by the composite inductor (or the equivalent thereof) when the substrate is viewed from above, and the same applies to the following.

Further, the temperature rise of the substrate when the composite inductor 100 according to the first embodiment was mounted on the substrate was obtained by simulation. The rising temperature was about 86 ° C.

In this simulation, it was assumed that the calorific value of each inductor 101 was the same, and the thermal conductivity of the core 103 and the shield portion 102 was the same. Further, heat is dissipated from the surfaces of the substrate, the core 103, and the terminal portion 106, and heat is transferred from the core 103 to the substrate.

(Comparative Example 1)
In Comparative Example 1, as shown in FIG. 7, two inductors 301 are arranged in parallel on the mounting surface P of the substrate. Each of the inductors 301 is configured in substantially the same manner as the inductor 101 according to the first embodiment. The winding direction of the coil body included in the inductor 301 is perpendicular to the mounting surface P.

When the coupling coefficient was determined by the same method as in Example 1, the coupling coefficient according to Comparative Example 1 was about 0.019.

The mounting area according to Comparative Example 1 was about 220 mm ² .

When the rising temperature of the substrate was determined by the same method as in Example 1, the rising temperature of the substrate according to Comparative Example 1 was about 86 ° C.

(Comparative Example 2)
In Comparative Example 2, as shown in FIG. 8, two inductors 401 are vertically stacked on the mounting surface P of the substrate via the shield portion 103. Each of the inductors 401 is configured in substantially the same manner as the inductor 101 according to the first embodiment. The winding direction of the coil body included in the inductor 401 is perpendicular to the substrate. As can be seen with reference to FIG. 8, the length of the terminal portion 406 differs greatly between the upper inductor 401 and the lower inductor 401.

The mounting area according to Comparative Example 2 was about 100 mm ² .

When the rising temperature of the substrate was determined by the same method as in Example 1, the rising temperature of the substrate according to Comparative Example 2 was about 106 ° C.

(Comparison between Example 1 and Comparative Examples 1 and 2)
In the first embodiment, the mounting area can be reduced while realizing a sufficiently smaller coupling coefficient than in the first comparative example. In Comparative Example 2, although the mounting area is smaller than that in Example 1,
The difference in resistance value of each inductor 401 including the terminal portion 306 is large, and the temperature rise is also large. If the temperature rise is large, a temperature difference is likely to occur in each inductor 401. Therefore, in Comparative Example 2, there is a possibility that an imbalance may occur in the current waveform due to the difference in the resistance value of each inductor 401 and the temperature difference of each inductor 401.

Therefore, in the first embodiment, it is possible to easily equalize the resistance value of each inductor 101 and suppress the temperature difference of each inductor 101 that occurs during operation while reducing the mounting area of the two inductors 101. It turns out that it is possible.

(Example 2)
The composite inductor 200 according to the second embodiment is a more specific example of the composite inductor 200 according to the second embodiment.

The coil main body 204 according to this embodiment is a flat copper conductor having a width of 2.0 mm and a thickness of 0.5 mm, which is covered with an insulating film of polyamide-imide, and wound around it for 5 turns with an inner diameter of 2.0 mm. ..

The drawer portion 205 according to the present embodiment is formed into a flat plate having a width of 4.0 mm and a thickness of 0.25 mm by rolling a flat conductor extending from the coil main body 204.

The terminal member 211 according to the present embodiment is a copper plate having a width of 5 mm, a length of 13 mm, and a thickness of 0.25 mm, which has a connecting portion 209 forming a through hole having a width of 0.3 mm.

Each of the magnetic flat powder and the binder used as the material of the shield portion 202 according to the present embodiment is the same as the material of the shield portion 102 according to the first embodiment. The solvent and thickener used when producing the shield portion 202 are also the same as in Example 1.

The composite inductor 200 according to this embodiment is manufactured through each step shown in FIG.

Specifically, in step 201, the core 103 in which the coil main body 204 is embedded is manufactured. The method for producing the core 103 is the same as that in the first embodiment.

After the core 103 is dried under the condition of 150 ° C., in the step 202, the terminal members 211 are arranged and adhered to the left and right outer surfaces of the core 103 while inserting the drawer portion 205 into the connecting portion 209.

In step 203, the exposed portion of the drawer protrusion 213 is bent rearward and fixed to the extending portion 207 by soldering. Further, in step 204, the mounting portion 108 is formed by bending the vicinity of the lower end of the terminal member 211 inward along the lower surface of the core 103.

By repeating such steps 201 to 204 three times, three inductors 201 are manufactured.

In step 206, four shield portions 202 are produced.

Specifically, the shield portion 202 is manufactured by providing the through hole portion 212 having an inner diameter of 2.0 mm in the shield portion 102 produced in the same manner as in the step 106 according to the first embodiment. The through hole portion 213 is provided by machining in the substantially center of the main surface.

In step 207 and step 208, the four shield portions 202 produced in step 206 are adhered to each of the three inductors 201 and to each of the front and rear ends of the entire three inductors 201 with an adhesive. It is fixed. As a result, the composite inductor 200 according to this embodiment is manufactured.

The coupling coefficient was obtained by mounting the composite inductor 200 according to the second embodiment on a substrate, applying an AC voltage of 10 V-50 Hz to the central inductor 201, and measuring the induced voltage to the front or rear inductor 201. .. The coupling coefficient of the composite inductor 200 according to the second embodiment was about 0.013.

The mounting area according to the second embodiment was about 236 mm ² .

When the rising temperature of the substrate was determined by the same method as in Example 1, the rising temperature of the substrate according to Comparative Example 1 was about 108 ° C.

(Comparison between Example 2 and Comparative Examples 1 and 2)
In Example 2, a coupling coefficient that is sufficiently smaller than that of Comparative Example 1 can be realized. Further, in the second embodiment, although the number of inductors 201 is three, the mounting area is increased by only about 18% as compared with the case of Comparative Example 1 in which the number of inductors 301 is two.

In Example 2, since the number of inductors 201 is larger than the number of inductors 301 in Comparative Example 1, the rising temperature of the substrate is larger than that of Comparative Example 1. However, when viewed in terms of the temperature rise per inductor 201, 301, Example 2 (about 36 ° C.) is smaller than Comparative Example 1 (about 43 ° C.).

Further, in Example 2, although the number of inductors 201 is larger than the number of inductors 401 in Comparative Example 2, the rising temperature of the substrate is suppressed to the same level as in Comparative Example 2.

When three inductors 401 are laminated in a laminated arrangement as in Comparative Example 2, it is extremely difficult to arrange the terminal portion 406. Even if the three inductors 401 can be stacked and arranged to provide the terminal portion 406, the terminal portion 406 connected to the uppermost inductor 401 and the terminal portion 406 connected to the lowermost inductor 401 may be formed. The difference in length is larger than that of the terminal portion 406 connected to the upper and lower inductors 401 in Comparative Example 2. Therefore, it is clear that the difference in the resistance values of the inductors including the terminal portion is larger than that in Comparative Example 2, and the temperature rise is expected to be large. Therefore, even if the three inductors 401 can be stacked and arranged, there is a higher possibility that an imbalance will occur in the current waveform as compared with Comparative Example 2.

Therefore, in the second embodiment, it is possible to provide the three inductors 201 while reducing the mounting area, the resistance value of each inductor 201 can be easily made uniform, and the temperature of each inductor 201 generated during operation. It can be seen that the difference can be suppressed.

Although the embodiments and examples of the present invention have been described above, the present invention is not limited thereto. The present invention includes, for example, an embodiment in which an embodiment is modified, an embodiment in which an embodiment and a modified example are appropriately combined, an embodiment in which these embodiments are appropriately modified, and the like.

The present invention is useful when mounting a plurality of inductors, such as a multiphase circuit having a plurality of DC-DC circuits.

100,200 Composite inductor 101, 201, 301, 401 Inductor 102, 202 Shield part 103 Core 104, 204 Coil body 105, 205 Drawer part 106, 206, 306, 406 Terminal part 107, 207 Extension part 108 Mounting part 109, 209 Connection part 110 Drawer member 111, 211 Terminal member 212 Through hole part 213 Drawer protrusion P mounting surface

Claims (13)

Conducting to each of the core to which the magnetic powder is bound with a binder, the coil body composed of the conductor wound inside the core, and the end portion of the coil body toward the mounting surface. Multiple inductors, each containing an extending terminal,
It has a higher magnetic permeability than each of the cores, and includes a shield portion provided between the plurality of inductors.
The coil body is a composite inductor characterized in that the winding shafts are arranged along a single axis parallel to the mounting surface. The composite inductor according to claim 1, wherein each of the terminal portions is provided outside the core. Each of the terminal portions
An extension along the outer surface of the core towards the mounting surface,
The composite inductor according to claim 2, further comprising a mounting portion that is a portion for fixing to the mounting surface and that extends from the extending portion by bending or bending along the mounting surface. The composite inductor according to claim 2 or 3, wherein each of the terminal portions has a length in a direction along the one axis. At least one of the inductors
A portion for pulling out the end portion of the coil body to the outside of the core, further including a pull-out portion connected to the terminal portion outside the core.
The composite inductor according to any one of claims 2 to 4, wherein a portion of the drawer portion exposed to the outside of the core has a shape having a planar spread. The composite inductor according to any one of claims 1 to 5, wherein each of the coil bodies is composed of a flat-wise wound curved plate-shaped conductor. There are a plurality of shield portions,
The composite inductor according to any one of claims 1 to 6, further comprising a shield portion provided at an end of the plurality of inductors along the one axis. The composite inductor according to any one of claims 1 to 7, wherein the shield portion is formed by binding magnetic flat powder whose surface is covered with an insulating film with a binder. The composite inductor according to any one of claims 1 to 8, wherein the shield portion has a length along the uniaxial portion of 20% or more and 40% or less of the core. According to any one of claims 1 to 9, the shield portion has a flat plate shape, is provided perpendicular to the uniaxial axis, and has a magnetic permeability in the main surface of 200 or more and 300 or less. The composite inductor described. The composite inductor according to any one of claims 1 to 10, wherein the shield portion includes a through hole portion centered on the uniaxial axis. An electrical and electronic device comprising the composite inductor according to any one of claims 1 to 11. By arranging a coil body in which a conductor is wound inside a kneaded product of a magnetic powder and a binder and press-molding the kneaded product, it conducts to each end of the coil body. Making multiple inductors with terminals extending toward the mounting surface,
A shield portion having a higher magnetic permeability than the core in which the kneaded product is pressure-molded is provided between the plurality of inductors in which the winding shafts of the coil body are arranged along one axis parallel to the mounting surface. A method of manufacturing a composite inductor, characterized in that it includes.

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