JP7413770B2 - magnetic parts - Google Patents

Description

The present invention relates to magnetic components.

Conventionally, a magnetic component described in Patent Document 1 has been known. This magnetic component includes a main body, a first core having a pair of legs disposed in two diagonal directions of the main body, and a second core connected to the first core via the legs. a conductor member disposed between the first core and the second core; and a heat dissipation member provided on the opposite side of the first core to the second core.

Japanese Patent Application Publication No. 2010-246364

In a conventional magnetic component, a region of the conductor member surrounded by each leg is sandwiched between the main body of the first core and the second core. In this structure, heat tends to accumulate in the region sandwiched between the first core and the second core. In this case, the heat generated in the conductor member near the area is transmitted to the conductor member toward the outer periphery of the core so as to spread in the plane direction, and then is transferred to the heat dissipation member at the outer periphery of the second core. It gets heated. As described above, since there is a distance between the heat generating portion and the heat radiating member, there is room for improvement in terms of suppressing the temperature rise of the conductor member.

Therefore, an object of the present invention is to provide a magnetic component that can suppress the temperature rise of a conductor member.

The magnetic component according to the present invention each has a main body, a first core and a second core arranged opposite to each other, a main body of the first core and a main body of the second core. and a heat dissipation member provided on at least one side of the conductor member in the opposing direction in which the first core and the second core face each other, the at least first core comprising: A pair of legs are arranged in two diagonal directions of the main body, and have legs extending toward the second core in the opposing direction, and the second core does not overlap the conductor member when viewed from the opposing direction. , and has a region that overlaps with the foot portion, and at least one core in the opposing direction among the first core and the second core is formed with a first penetration portion that penetrates in the opposing direction, and the heat dissipation member has a protrusion extending toward the conductor member through the first penetration.

In the magnetic component, at least one core of the first core and the second core in the opposing direction is formed with a first penetrating portion that penetrates in the opposing direction. As a result, a space is formed by the first penetrating portion at a location on the core side on one side of the conductor member. The heat dissipation member has a protrusion extending toward the conductor member through the first penetration portion. That is, the protrusion passes through the space formed by the first penetration part and approaches or contacts the conductor member. Thereby, the heat generated in the conductor member is efficiently transferred to the heat radiating member by the protrusion. As described above, it is possible to suppress the temperature rise of the conductor member.

The protrusion and the conductor member may be connected via a heat transfer member. The heat transfer member can contact the conductor member with high adhesion. Therefore, the heat of the conductor member is efficiently transferred to the heat radiating member via the heat transfer member.

A gap may be formed between the protrusion and the second core. Thereby, even if the heat transfer member overflows from between the protrusion and the conductor member, it can be received in the gap.

A second penetrating portion may be formed in the first core and penetrating in the opposite direction. As a result, a space is formed by the second penetrating portion at a location on the first core side of the conductor member. Therefore, the heat generated in the conductor member is radiated through the space of the second penetration part. As described above, it is possible to further suppress the temperature rise in the portion of the conductor member surrounded by the plurality of legs of the first core.

According to the present invention, it is possible to suppress the temperature rise of the conductor member.

FIG. 1 is a perspective view showing a magnetic component according to an embodiment of the present invention. FIG. 2 is a developed view of the magnetic component shown in FIG. 1. FIG. 2 is a sectional view taken along line III-III in FIG. 1. FIG. It is a sectional view of the magnetic component concerning a modification. It is a sectional view of the magnetic member concerning a modification.

Hereinafter, preferred embodiments of a molding apparatus according to the present invention will be described with reference to the drawings. In addition, in each figure, the same parts or corresponding parts are given the same reference numerals, and overlapping explanations will be omitted.

FIG. 1 is a perspective view showing a magnetic component 100 according to an embodiment of the present invention. FIG. 2 is a developed view of the magnetic component 100 shown in FIG. FIG. 3 is a cross-sectional view taken along line III-III in FIG. In this embodiment, a transformer is exemplified as the magnetic component 100, but the magnetic component is not particularly limited and may be an inductor or the like. As shown in FIGS. 1 to 3, the magnetic component 100 includes a first core 1, a second core 2, a heat dissipation member 3, and a substrate 4 having a conductor member 6. This magnetic component 100 is used in a switching power supply device such as a DC-DC converter. Note that the direction in which the first core 1 and the second core 2 face each other is defined as the Z-axis direction. The first core 1 side is the positive side in the Z-axis direction. Further, directions perpendicular to the Z-axis direction are referred to as the X-axis direction and the Y-axis direction.

The first core 1 includes a main body 10 and a plurality of legs 11A, 11B, 11C, and 11D. The main body portion 10 has a rectangular plate shape that extends parallel to the XY plane. The main body portion 10 extends so as to have a pair of sides parallel to the X-axis direction and a pair of sides parallel to the Y-axis direction. Four leg portions 11A, 11B, 11C, and 11D are formed on the lower surface 10a of the main body portion 10 on the negative side in the Z-axis direction. Each of the leg portions 11A, 11B, 11C, and 11D extends from the four corners of the main body portion 10 toward the negative side in the Z-axis direction, that is, toward the second core 2 side. The foot portion 11A is arranged at a corner on the positive side in the X-axis direction and on the positive side in the Y-axis direction. The foot portion 11B is arranged at a corner on the positive side in the X-axis direction and on the negative side in the Y-axis direction. The foot portion 11C is arranged at a corner on the negative side in the X-axis direction and on the positive side in the Y-axis direction. The foot portion 11D is arranged at a corner on the negative side in the X-axis direction and on the positive side in the Y-axis direction. As described above, the first core 1 includes the leg portions 11A, 11C and the leg portions 11B, 11D, which are arranged in pairs in two diagonal directions of the main body portion 10. Here, one diagonal direction corresponds to a direction that makes a 45° angle to the positive side of the Y-axis with respect to the positive side of the The direction forming 45° corresponds to the other diagonal direction.

Each foot portion 11A, 11B, 11C, 11D is inserted into the through hole 21A, 21B, 21C, 21D of the substrate 4, and extends to the negative side of the substrate 4 in the Z-axis direction. In this embodiment, the foot portion 11 has a cylindrical shape. The four leg portions 11A, 11B, 11C, and 11D are arranged so as to be spaced apart from each other in the X-axis direction and the Y-axis direction. The center position 12 of the lower surface 10a of the main body part 10 is an area surrounded by the four leg parts 11A, 11B, 11C, and 11D. That is, the center position 12 is a position between the foot portions 11A and 11C in one diagonal direction and between the foot portions 11B and 11D in the other diagonal direction.

The second core 2 is magnetically connected to the first core 1 via legs 11A, 11B, 11C, and 11D. The second core 2 has a rectangular plate shape that extends parallel to the XY plane. The second core 2 is arranged so as to overlap the first core 1 when viewed from the Z-axis direction. On the upper surface 2a of the second core 2 on the positive side in the Z-axis direction, the lower surfaces of the four leg portions 11A, 11B, 11C, and 11D of the first core 1 are arranged. The legs 11A, 11B, 11C, and 11D are arranged near the four corners of the second core 2, respectively. That is, the second core 2 has a region TE (see FIG. 2) that does not overlap the conductor member 6 and overlaps the leg portions 11A, 11B, 11C, and 11D when viewed from the Z-axis direction. The combination of the first core 1 and the second core 2 constitutes a magnetic core. The second core 2 has a penetrating portion 16 (first penetrating portion) that penetrates in the Z-axis direction at a central position. The detailed configuration of the penetrating portion 16 will be described later.

The heat dissipation member 3 is provided closer to the second core 2 than the substrate 4 having the conductor member 6, and is a member that dissipates heat generated in the magnetic component 100. The heat dissipation member 3 has a plate-like shape that extends parallel to the XY plane. Furthermore, the heat dissipation member 3 has a groove portion 31 for accommodating the second core 2. The groove portion 31 is a rectangular recess formed in the upper surface 3a of the heat dissipation member 3 on the positive side in the Z-axis direction.

The groove portion 31 has a rectangular bottom surface 31a and four side surfaces 31b rising from the four sides of the bottom surface 31a toward the positive side in the Z-axis direction. The bottom surface 31a is a surface spaced apart from the top surface 3a of the heat dissipation member 3 toward the negative side in the Z-axis direction. The bottom surface 31a extends parallel to the XY plane. The four side surfaces 31b extend parallel to the XZ plane or the YZ plane. The lower surface 2b of the second core 2 on the negative side in the Z-axis direction is arranged on the bottom surface 31a of the groove portion 31 so as to be in contact with the bottom surface 31a. Further, the upper surface 2a of the second core 2 disposed in the groove 31 is disposed at a position on the negative side in the Z-axis direction than the upper surface 3a of the heat dissipation member 3 (see FIG. 3). The four side surfaces 2c of the second core 2 are arranged to face the four side surfaces 31b of the groove 31. A slight gap is formed between the four side surfaces 2c and the four side surfaces 31b (see FIG. 3). A protrusion 32 is formed in the groove 31 . The detailed configuration of the protruding portion 32 will be described later.

The board 4 is a plate-shaped member extending parallel to the XY plane on which various electronic components are mounted. The substrate 4 is arranged between the first core 1 and the second core 2. The substrate 4 is arranged on the upper surface 3a of the heat dissipation member 3. A conductor member 6 is provided on the substrate 4 by forming a winding made of a conductive material. The conductor member 6 is formed on both the upper surface 4a of the substrate 4 on the positive side in the Z-axis direction and the lower surface 4b on the negative side in the Z-axis direction. The windings of the conductor member 6 on the upper surface 4a and the windings of the conductor member 6 on the lower surface 4b are connected in series to each other and constitute a coil. Four through holes 21A, 21B, 21C, and 21D are formed in the substrate 4, through which the legs 11A, 11B, 11C, and 11D are inserted. At this position, a through hole is also formed in the conductor member 6. A conductor member 6 is also arranged in a region 22 surrounded by four through holes 21A, 21B, 21C, and 21D. Note that the shapes of the substrate 4 and the conductor member 6 shown in the figures are merely examples, and they may be configured in any pattern as long as a winding can be configured to form a magnetic path as described later.

With the above configuration, in the magnetic component 100, the distance between the foot portion 11A, the foot portion 11B, and the foot portion 11A and the foot portion 11B of the main body portion 10 of the first core 1 and the second core 2 is reduced. A magnetic path is formed by the portion and. In addition, in the magnetic component 100, a magnetic path is formed by the foot portion 11B, the foot portion 11C, and the portion between the foot portion 11B and the foot portion 11C of the main body portion 10 of the first core 1 and the second core 2. is formed. In addition, in the magnetic component 100, a magnetic path is formed by the foot portion 11C, the foot portion 11D, and the portion between the foot portion 11C and the foot portion 11D of the main body portion 10 of the first core 1 and the second core 2. is formed. In addition, in the magnetic component 100, a magnetic path is formed by the foot portion 11D, the foot portion 11A, and the portion between the foot portion 11D and the foot portion 11A of the main body portion 10 of the first core 1 and the second core 2. is formed. Note that the directions of the magnetic paths formed in the diagonal foot portions 11A and 11C and the magnetic paths formed in the diagonal foot portions 11B and 11D are opposite to each other.

Next, the heat dissipation structure of the magnetic component 100 will be described in detail with reference to FIGS. 2 and 3.

A penetrating portion 16 is formed in the second core 2 . The penetrating portion 16 penetrates in the Z-axis direction from the upper surface 2a to the lower surface 2b at the central position of the second core 2. The penetrating portion 16 is constituted by a rectangular through hole having inner surfaces 16a on all sides. The four inner surfaces 16a are configured by planes extending parallel to the Z-axis direction. The four inner surfaces 16a are arranged parallel to the four side surfaces 2c of the second core 2, respectively. The penetrating portion 16 is formed at a position facing the region 22 of the substrate 4 and the center position 12 of the first core 1 in the Z-axis direction.

The heat dissipation member 3 has a protrusion 32 extending toward the conductor member 6 through the penetration portion 16 . The protrusion 32 protrudes toward the positive side in the Z-axis direction at the center of the bottom surface 31a of the groove 31. The protruding portion 32 is inserted into the penetrating portion 16 of the second core 2 and extends to the front side of the conductor member 6 on the lower surface 4b side of the substrate 4. The protrusion 32 has a square prism shape. The protrusion 32 has an upper surface 32a on the positive side in the Z-axis direction and four side surfaces 32b.

The upper surface 32a of the protrusion 32 is a rectangular plane parallel to the XY plane. The upper surface 2a of the protrusion 32 is formed at a position facing the region 22 of the substrate 4 and the center position 12 of the first core 1 in the Z-axis direction. The upper surface 32a is located on the positive side in the Z-axis direction relative to the upper surface 2a of the second core 2, and on the negative side in the Z-axis direction than the conductor member 6 on the lower surface 4b side of the substrate 4. The upper surface 32a faces the conductor member 6 in the region 22 while being spaced apart in the Z-axis direction. A heat transfer member 8 is filled between the upper surface 32a and the conductor member 6. Heat transfer member 8 connects upper surface 32a and conductor member 6. Thereby, the protruding portion 32 and the conductor member 6 are connected via the heat transfer member 8. As the heat transfer member 8, a filler or the like is used.

The four side surfaces 32b of the protrusion 32 are configured by planes extending parallel to the Z-axis direction. The four side surfaces 32b are arranged parallel to the four inner surfaces 16a of the penetrating portion 16 of the second core 2, respectively. The four side surfaces 32b and the four inner surfaces 16a of the penetrating portion 16 face each other in the X-axis direction or the Y-axis direction. Further, as shown in FIG. 3, slight gaps are formed between the four side surfaces 32b and the four inner surfaces 16a of the penetrating portion 16, respectively. Thereby, a gap 40 is formed between the protrusion 32 and the second core 2. The gap 40 is configured by the side surface 32b of the protrusion 32, the inner surface 16a of the penetrating portion 16, and the bottom surface 31a. When the excess heat transfer member 8 overflows from between the upper surface 32a and the conductor member 6, the gap 40 receives the overflowing heat transfer member 8. The size of the gap 40 is not particularly limited, but should be large enough to prevent the heat transfer member 8 from advancing toward the upper surface 2a of the second core 2 when receiving the overflowing heat transfer member 8. may be set to

Next, the functions and effects of the magnetic component 100 according to this embodiment will be explained.

First, a magnetic component according to a comparative example will be described. The magnetic component according to the comparative example differs from the magnetic component 100 of the present embodiment in that the second core 2 does not have the through portion 16 and the groove portion 31 does not have the protrusion 32. That is, in the second core 2 of the magnetic component of the comparative example, the center position is not open but is closed with the core material. In the magnetic component according to the comparative example, the region 22 of the substrate 4 is sandwiched between the main body 10 of the first core 1 and the second core 2 in the Z-axis direction. In this structure, the region 22 sandwiched between the first core 1 and the second core 2 tends to trap heat. In this case, the heat generated near the area 22 of the conductor member 6 is transmitted to the outer circumference of the cores 1 and 2 so as to spread in the plane direction within the conductor member 6, and then is transferred to the outer circumference of the second core 2. Heat is transferred to the heat dissipation member 3 at this portion. As described above, since there is a distance between the region 22 and the heat dissipating member 3, there is room for improvement in terms of suppressing the temperature rise of the conductor member 6 (particularly the temperature rise near the region 22).

In contrast, the magnetic component 100 according to the present embodiment has a first core 1 having a main body 10 and a pair of legs 11A, 11B, 11C, and 11D arranged in two diagonal directions of the main body 10. , a second core 2 connected to the first core 1 via the legs 11A, 11B, 11C, and 11D, and a conductor member disposed between the first core 1 and the second core 2. 6, and a heat dissipation member 3 provided on the opposite side of the first core 1 with respect to the second core 2. The second core 2 is formed with a penetrating portion 16 that penetrates in the Z-axis direction, which is the opposing direction in which the first core 1 and the second core 2 face each other. The heat dissipation member 3 has a protrusion 32 extending toward the conductor member 6 through the penetration portion 16 .

In the magnetic component 100, the second core 2 is formed with a through portion 16 that penetrates in the Z-axis direction. As a result, a space is formed by the penetrating portion 16 at a portion of the conductor member 6 near the region 22 on the second core 2 side. The heat dissipation member 3 has a protrusion 32 extending toward the conductor member 6 through the penetration portion 16 . That is, the protruding portion 32 can pass through the space formed by the penetrating portion 16 and approach or come into contact with the conductor member 6 . As a result, heat generated in the conductor member 6 near the region 22 is efficiently transferred to the heat dissipation member 3 by the protrusion 32. As described above, the temperature rise of the conductor member 6 can be suppressed.

As described above, the magnetic path formed in the second core 2 is sandwiched between the legs 11A and 11B, between the legs 11B and 11C, between the legs 11C and 11D, and between the legs 11D and 11A. It is formed in the part where the That is, a magnetic path is formed near the outer peripheral edge of the second core 2. Therefore, the core material near the center of the second core 2 does not contribute much to the formation of the magnetic path. Therefore, even if the penetrating portion 16 is formed at the center position of the second core 2, the influence of the penetrating portion 16 on the magnetic properties is limited.

The protrusion 32 and the conductor member 6 are connected via the heat transfer member 8. The heat transfer member 8 can contact the conductor member 6 with high adhesion. Therefore, the heat of the conductor member 6 is efficiently transferred to the heat radiating member 3 via the heat transfer member 8.

A gap 40 is formed between the protrusion 32 and the second core 2. Thereby, even if the heat transfer member 8 overflows from between the protrusion 32 and the conductor member 6, it can be received by the gap 40.

The invention is not limited to the embodiments described above.

For example, a magnetic component 100 as shown in FIG. 4 may be employed. In the magnetic component 100, the first core 1 is formed with a penetrating portion 50 (second penetrating portion) that penetrates in the Z-axis direction. The penetrating portion 50 penetrates the first core 1 at the center position 12 in the Z-axis direction. The penetrating portion 50 is constituted by a rectangular through hole having inner surfaces 50a on all sides. The four inner surfaces 50a are configured by planes extending parallel to the Z-axis direction. The four inner surfaces 50a are arranged parallel to the four side surfaces of the first core 1, respectively. The penetrating portion 50 is formed at a position facing the region 22 of the substrate 4 in the Z-axis direction.

According to the magnetic component 100, a space is formed by the penetrating portion 50 at a portion of the conductor member 6 near the region 22 on the first core 1 side. Therefore, the heat generated in the conductor member 6 is radiated through the space of the through portion 50. As described above, it is possible to further suppress the temperature rise in the portion of the conductor member 6 surrounded by the plurality of legs 11A, 11B, 11C, and 11D of the first core 1.

For example, a magnetic component 200 as shown in FIG. 5 may be employed. In this magnetic component 200, in addition to the first core 201A having four legs 221A, the second core 201B also has four legs 221B. The lower surfaces of the four leg sections 221A are connected to the upper surfaces of the four leg sections 221B. In this case, the upper surface of the foot portion 221B corresponds to "an area that does not overlap the conductor member and overlaps the foot portion when viewed from the opposing direction." Furthermore, heat dissipation members 203A and 203B are provided on both the first core 201A side and the second core 201B side with respect to the substrate 204, and penetration portions are provided on both the first core 201A and the second core 201B. 216A and 216B (first penetration portions) are formed. The substrate 204 has conductor members 222 on both main surfaces. Furthermore, the heat dissipation members 203A and 203B have protrusions 232A and 232B that extend toward the conductor member 222 via the through portions 216A and 216B. Projections 232A and 232B are connected to conductor member 222 via heat transfer members 208A and 208B, respectively.

In addition, in the above-mentioned embodiment, although the protrusion part 32 and the conductor member 6 were connected via the heat transfer member 8, the heat transfer member 8 does not need to be provided. In this case, it is preferable that the upper surface 32a of the protrusion 32 contacts the conductor member 6 while maintaining insulation.

Note that the shapes and positions of the penetrating portions 16 and 50 and the protruding portions 32 may be changed in any manner as long as the magnetic properties of the cores 1 and 2 are not excessively affected.

DESCRIPTION OF SYMBOLS 1...First core, 2...Second core, 3...Heat radiation member, 4...Substrate, 6...Conductor member, 8...Heat transfer member, 16...Penetration part (first penetration part), 32...Protrusion part , 40... Gap, 50... Penetration part (second penetration part), 100, 200... Magnetic component.

Claims (3)

A first core and a second core, each having a main body and disposed opposite to each other;
a conductor member disposed between the main body part of the first core and the main body part of the second core;
a heat dissipation member provided on at least one side with respect to the conductor member in the opposing direction in which the first core and the second core face each other,
At least the first core has legs arranged in pairs in two diagonal directions of the main body and extending toward the second core in the opposing direction,
The second core has a region that does not overlap the conductor member and overlaps the foot portion when viewed from the opposing direction,
Of the first core and the second core, at least a core on one side in the opposing direction is formed with a first penetrating portion that penetrates in the opposing direction,
The heat dissipation member has a protrusion extending toward the conductor member through the first penetration part,
The end side surface of the protrusion in the opposing direction contacts or faces the surface of the conductor member ,
The protrusion and the conductor member are connected via a heat transfer member,
A gap is formed between the protrusion and the one-side core to receive the heat transfer member when the heat transfer member overflows between the protrusion and the conductor member. parts. The heat dissipation member is not provided on the other side with respect to the conductor member in the opposing direction,
The magnetic component according to claim 1 , wherein the core on the other side in the opposing direction is formed with a second penetrating portion that penetrates in the opposing direction. The heat dissipation member is provided closer to the second core than the conductor member,
The magnetic component according to claim 1 or 2 , wherein the first penetration portion is formed in the second core.

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