JP2023092146A - Coil device - Google Patents

Abstract

To provide a coil device which can be assembled through a simple process and is advantageous for downsizing and height reduction.SOLUTION: The present invention relates to a coil device comprising: a core including a pair of core base parts extending in a first direction and disposed while interposing a predetermined interval therebetween in a second direction, and a core leg part including a first core leg part, a second core leg part, a third core leg part, a fourth core leg part and a fifth core leg part which are arrayed while being mutually spaced successively from one end to the other end of the core base part in the first direction; a first winding passing a first gap and a third gap and including a first winding part which is wound so as to enclose the second core leg part and the third core leg part; a second winding passing a second gap and the third gap and including a second winding part which is wound so as to enclose the third core leg part; a third winding passing a fourth gap and the third gap and including a third winding part which is wound so as to enclose the fourth core leg part; and a bobbin around which the first winding part, the second winding part and the third winding part are wound.SELECTED DRAWING: Figure 1

Description

The present invention relates to a compound coil arrangement having three or more windings.

There is a need for a compound coil arrangement, such as a compound transformer having three or more turns and combining the functions of a transformer and an inductor. As a conventional complex coil device, an E-core is added to the back of the E-core on one side of the transformer part formed using the E-E core to create a structure using three E-cores. It has been proposed to give the winding part arranged on the E core that has the function of an inductor (see Patent Document 1, etc.).

However, the conventional coil device shown in Patent Document 1 has a structure in which three E-cores are stacked in three stages, so it is difficult to shorten the length in the axial direction. have Also, in the structure in which the E-core is stacked in three stages, the process of assembling the core and the bobbin is complicated.

JP 2012-54549 A

The present invention has been made in view of such actual circumstances, and is a composite coil device having three or more winding portions, which can be assembled in a simple process and which is advantageous for miniaturization and low profile. Regarding.

A coil device according to a first aspect of the present invention includes:
At least one of a pair of core base portions extending in a first direction and arranged substantially parallel to each other with a predetermined spacing in a second direction perpendicular to the first direction, and the pair of core base portions. The first core base portion protrudes from one side to the other side and is arranged along the first direction at intervals from one end of the core base portion to the other end in the first direction. a core leg having a core leg, a second core leg, a third core leg, a fourth core leg and a fifth core leg;
a first gap formed between the first core leg portion and the second core leg portion; and a third gap formed between the third core leg portion and the fourth core leg portion. a first winding having a first winding portion wound so as to surround the second core leg portion and the third core leg portion;
A second winding that passes through a second gap formed between the second core leg portion and the third core leg portion and the third gap and is wound so as to surround the third core leg portion. a second winding having a portion;
A third winding that passes through a fourth gap formed between the fourth core leg portion and the fifth core leg portion and the third gap and is wound so as to surround the fourth core leg portion. a third winding having a portion;
a bobbin around which the first winding portion, the second winding portion, and the third winding portion are wound;

In the coil device according to the first aspect of the present invention, the core having the first to fifth core leg portions is used to set the first to third winding portions of the winding to the predetermined gaps among the first to fourth gaps. A coil device that can be assembled in a simple process and is advantageous in miniaturization and low profile is realized by arranging it at the position of . For example, since all of the first to fifth leg portions are arranged between one core base portion, it is possible to assemble in a simple process, which is advantageous for miniaturization and low profile. In addition, since the first winding portion, the second winding portion, and the third winding portion all pass through the third gap of the core, it is advantageous in terms of downsizing the core and shortening the winding length. is.

Further, for example, the second winding and the third winding may be electrically connected.

By electrically connecting the second winding and the third winding, the coil device is a composite coil device having the third winding as a resonance coil connected in series with the second winding of the transformer section. Configure. Alternatively, however, the electrical connection between the second winding and the third winding may be made outside the coil device, for example, via a substrate on which the coil device is mounted.

Further, for example, the bobbin includes a first bobbin portion around which the first winding portion is wound, a second bobbin portion around which the second winding portion is wound, and a third winding portion. and a third bobbin part to be turned, wherein said first bobbin part, said second bobbin part and said third bobbin part may be separable from each other.

Since the three bobbins are separately molded, the first to third turns can be formed separately for each bobbin and then assembled to produce the coil device, thus making such a coil The device is easy to assemble.

Further, for example, the second bobbin portion may have a second hollow cylindrical portion through which the third core leg portion is inserted,
The first bobbin portion may have a first hollow cylindrical portion through which the second bobbin portion and the second core leg portion are inserted,
The third bobbin portion may have a third hollow cylindrical portion through which the fourth core leg portion is inserted.

A coil device having such a bobbin can be easily assembled by arranging the first to third hollow cylindrical portions on the corresponding core leg portions. Also, the bobbin and the first to third winding portions are arranged with good accuracy with respect to the core.

Further, for example, the first bobbin portion and the third bobbin portion may be adjacent to each other with the third gap.

In such a coil device, since the transformer portion and the resonance coil portion (inductor portion) are arranged adjacent to each other, it is advantageous in terms of miniaturization.

Further, for example, the distance along the first direction from the one end of the core base portion to the third core leg is equal to the distance from the other end to the third core leg in the first direction. may be shorter than the distance along

In such a coil device, the core is asymmetric with respect to the third core leg, and the space required for the transformer portion and the space required for the resonance coil portion can be equally allocated, which is advantageous in terms of miniaturization. is.

Further, for example, the third gap may be wider than the second gap in terms of width along the first direction.

Of the first to third winding parts, only the second winding part passes through the second gap, and only the first to third winding parts pass through the third gap, so the third gap is wider than the second gap. By doing so, the gap through which the winding portion passes can be formed just enough, which is advantageous from the viewpoint of downsizing.

Further, for example, the first core leg portion and the fifth core leg portion may be substantially equal in length in a third direction perpendicular to the first direction and the second direction.

Such a core facilitates formation of the first core leg portion and the fifth core leg portion having just the right size for allowing magnetic flux to pass through, which is advantageous from the viewpoint of size reduction of the core.

Further, for example, regarding lengths in a third direction perpendicular to the first direction and the second direction, the third core leg is divided into the first core leg, the second core leg, and the fourth core leg. and the fifth core leg.

By shortening the length of the third core leg portion in the third direction, in such a core, the core base portion can have a constricted shape at the central portion in the first direction. Therefore, in a coil device having such a core, the lead-out portions of the first to third windings can be arranged in the constricted portion of the core base portion, which is advantageous in terms of miniaturization and low height.

Further, for example, the first core leg portion and the fifth core leg portion may be substantially equal in cross-sectional area of a cross section orthogonal to the second direction, and the third core leg portion may be substantially equal to the first core leg portion. It may be substantially equal to the sum of the leg and the fifth core leg.

Such a core facilitates formation of the first core leg portion, the third core leg portion, and the fifth core leg portion having just the right size for allowing magnetic flux to pass through, which is advantageous from the standpoint of size reduction of the core. .

Further, for example, a second gap may be formed in the second core leg portion, a third gap may be formed in the third core leg portion, and a third gap may be formed in the fourth core leg portion. may be formed with a fourth gap, and the length of the third gap in the second direction may be shorter than the lengths of the second gap and the fourth gap in the second direction.

By forming such a gap, a composite coil system is obtained that produces a predetermined relatively large leakage.

In addition, a coil device according to a second aspect of the present invention extends in a first direction and is arranged substantially parallel to each other with a predetermined spacing in a second direction perpendicular to the first direction. and a core base portion projecting from at least one side of a pair of said core base portions to the other side, and extending along said first direction from one end of said core base portion to the other end thereof in said first direction. At least one a core that can be separated into a first core portion including the core base portion of and a second core portion including at least the other core base portion;
A first bobbin portion disposed between the core base portion on one side and the core base portion on the other side, on which the first winding portion of the first winding is wound; a second bobbin portion around which the winding portion is wound; and a third bobbin portion around which the third winding portion of the third winding is wound, wherein the first bobbin portion and the second bobbin portion and a bobbin in which the third bobbin portion is separable from each other.

A coil device according to a second aspect of the present invention has a core in which first to fifth core legs are arranged in a first direction and separable into a first core portion and a second core portion, and two It has a structure in which first to third bobbin portions separable from each other are arranged between the core base portions. Such a coil device can be assembled in a simple process, which is advantageous for miniaturization and low profile.

FIG. 1 is an external view of a coil device according to one embodiment of the present invention. 2 is an exploded perspective view of the coil device shown in FIG. 1. FIG. 3 is a perspective view showing a portion of the coil device shown in FIG. 1 excluding the core. FIG. FIG. 4 is a top view showing a portion of the coil device shown in FIG. 1 excluding the core. 5 is a perspective view showing a bobbin in the coil device shown in FIG. 1. FIG. 5 is an exploded perspective view of the bobbin shown in FIG. 5. FIG. 7 is a sectional view of the coil device shown in FIG. 1. FIG. FIG. 8 is a conceptual diagram showing the winding structure of the coil device shown in FIG. 9 is a conceptual diagram showing the flow of magnetic flux in the coil device shown in FIG. 1. FIG. 10 is a conceptual diagram showing a circuit of the coil device shown in FIG. 1. FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described based on embodiments shown in the drawings.

FIG. 1 is a schematic perspective view showing a coil device 10 according to one embodiment of the invention. The coil device 10 can be used, for example, as an on-vehicle power supply, a charging station, an ESS (Energy Storage System), and the like, but the application of the coil device 10 is not limited to these. As shown in FIG. 1, the coil device 10 has a core 20, a first winding 31, a second winding 32 (see FIGS. 7 and 8), a third winding 33, a bobbin 40 and the like.

As shown in FIG. 1, the coil device 10 has a substantially rectangular parallelepiped outer shape. As shown in FIG. 2, which is an exploded perspective view, the core 20 of the coil device 10 has a pair of plate-shaped core base portions 21a and 21b. The core 20 includes a first core portion 20a having at least a first core base portion 21a, which is one of the pair of core base portions 21a, 21b, and a second core portion 20a, which is the other of the pair of core base portions 21a, 21b. and a second core portion 20b having at least a core base portion 21b, and the first core portion 20a and the second core portion 20b are separable from each other.

In the description of the coil device 10, as shown in FIGS. 1 and 2, the direction in which the plate-shaped core base portions 21a and 21b extend and the direction in which core leg portions 22 described later are arranged is the X axis. A direction perpendicular to the pair of plate-shaped core base portions 21a and 21b arranged substantially parallel to each other is defined as the Z-axis direction, and a direction perpendicular to the X-axis direction and the Z-axis direction is defined as the Y-axis direction. In addition, in the description of the coil device 10, the Z-axis direction is described as the vertical direction, but the coil device 10 may be provided so that the first core portion 20a is positioned upward as shown in FIG. It may be provided such that the other direction is upward.

As shown in FIG. 2, the core 20 has a pair of core base portions 21a and 21b and a core leg portion 22 arranged between the pair of core base portions 21a and 21b. The first core base portion 21a, which is one of the pair of core base portions 21a, 21b, and the second core base portion 21b, which is the other of the pair of core base portions 21a and 21b, both extend in a first direction parallel to the X-axis direction (about the first direction D1). (see FIG. 2). The first core base portion 21a and the second core base portion 21b are spaced apart by a predetermined distance in a second direction perpendicular to the first direction (parallel to the Z-axis direction; see FIG. 2 for the second direction D2). They are arranged substantially parallel to each other.

The core leg portion 22 protrudes from at least one side of the pair of core base portions 21a and 21b to the other side. As shown in FIG. 2, the core leg portion 22 in the coil device 10 includes a portion that protrudes from the first core base portion 21a to the second core base portion 21b and a portion that protrudes from the second core base portion 21b to the first core base portion 21a. It is configured together with a protruding portion. That is, the core 20 includes a first core portion 20a having a first core base portion 21a and a portion of the core leg portion 22, and a second core portion 20a having a second core base portion 21b and another portion of the core leg portion 22. The EE core has substantially the same shape as the portion 20b. However, the core 20 of the coil device 10 is not limited to the EE core, and may have a shape other than the EE core, such as an EI core having only a core base portion on one side.

As shown in FIG. 2, the core leg 22 includes a first core leg 22a, a second core leg 22b, a third core leg 22c, a fourth core leg 22d, and a fifth core leg. 22e. The first core leg portion 22a, the second core leg portion 22b, the third core leg portion 22c, the fourth core leg portion 22d, and the fifth core leg portion 22e extend along the first direction parallel to the X-axis direction, The core base portions 21a and 21b are arranged in order from one end 21ac, 21bc to the other end 21ad, 21bd.

The first core leg portion 22a, the second core leg portion 22b, the third core leg portion 22c, the fourth core leg portion 22d, and the fifth core leg portion 22e are arranged at intervals in the first direction. be. Thereby, as shown in FIG. 2, a first gap 24a is formed between the first core leg portion 22a and the second core leg portion 22b, and a gap between the second core leg portion 22b and the third core leg portion 22c is formed. A second gap 24b is formed between them, a third gap 24c is formed between the third core leg portion 22c and the fourth core leg portion 22d, and a fourth core leg portion 22d and a fifth core leg portion are formed. 22e, a fourth gap 24d is formed.

As will be described later, the lengths in the first direction of the first to fourth gaps 24a, 24b, 24c, 24d formed between the respective first to fifth core legs 22a, 22b, 22c, 22d, 22e are not all common. However, unlike this, it is also possible to configure the coil device using cores in which the respective first to fifth core legs 22a, 22b, 22c, 22d, and 22e are arranged at regular intervals.

FIG. 7 is a cross-sectional view of the coil device 10 taken along a cross section parallel to the XZ plane and passing through the center of the coil device 10. FIG. As shown in FIG. 7, a second gap 22ba is formed in the second core leg portion 22b, a third gap 22ca is formed in the third core leg portion 22c, and a fourth gap 22ca is formed in the fourth core leg portion 22d. is formed with a fourth gap 22da. The length of the third gap 22ca in the second direction (the direction parallel to the Z-axis) is shorter than the lengths of the second gap 22ba and the fourth gap 22da in the second direction. As a result, the coil device 10 can set the leakage generated in the transformer portion and the resonance coil portion to an appropriate value. , the size of the circuit as a whole can be reduced.

As shown in FIG. 7, the second to fourth gaps 22ba to 22da are air gaps, but the second to fourth gaps 22ba to 22da are not limited to air gaps. Second to fourth gaps 22ba to 22da may be formed. A gap (a first gap and a second gap) may also be formed in the first core leg portion 22a and the fifth core leg portion 22e. In this case, the length of the gaps formed in the first core leg portion 22a and the fifth core leg portion 22e in the second direction is shorter than that of the second to fourth gaps 22ba to 22da. It is preferable in terms of characteristics as a composite transformer.

FIG. 8 is a conceptual diagram showing the arrangement of the second core portion 20b, the first winding 31, the second winding 32, and the third winding 33 in the coil device 10. These members in the coil device 10 are shown in FIG. It is the figure seen from upper direction. 8, the first core portion 20a and the bobbin 40 are omitted.

As shown in FIGS. 8 and 7, the distance along the first direction (parallel to the X-axis direction) from the ends 21ac and 21bc of the core base portions 21a and 21b to the center of the third core leg portion 22c is It is shorter than the distance along the first direction from the other end portions 21ad and 21bd to the center of the third core leg portion 22c. That is, the first to fifth core legs 22a to 22e are not evenly spaced in the first direction, and the core 20 is asymmetric with respect to the first direction. By arranging the core legs 22 of the core 20 as shown in FIGS. 7 and 8, the gaps for passing the first to third windings 31, 32, and 33 are formed just enough, and the coil device 10 Miniaturization can be achieved.

As shown in FIGS. 2 and 7, a first gap 24a is formed between the first core leg portion 22a and the second core leg portion 22b, and the first winding portion 31a of the first winding 31 is formed. passes through the first gap 24a. A second gap 24b is formed between the second core leg portion 22b and the third core leg portion 22c, and the second wound portion 32a of the second winding 32 passes through the second gap 24b.

A fourth gap 24d is formed between the fourth core leg portion 22d and the fifth core leg portion 22e, and the third wound portion 33a of the third winding 33 passes through the fourth gap 24d. Further, a third gap 24c is formed between the third core leg portion 22c and the fourth core leg portion 22d, and the first to third winding portions 31a of the first to third windings 31 to 33 are formed. 33a pass through the third gap 24c.

As shown in FIG. 7, the third gap 24c is wider than the second gap 24b in terms of width along the first direction. Further, regarding the width along the first direction, the third gap 24c is wider than the first gap 24a and the fourth gap 24d. By making the width of the third gap 24c through which all the first to third winding parts 31a to 33a pass wider than the first gap 24a, the second gap 24b and the fourth gap 24d, The widths of the first to fourth gaps 24a to 24d formed in the first to fourth gaps 24a to 24d correspond to the first to third winding portions 31a to 33a passing through the first to fourth gaps 24a to 24d, and are not too short. , which contributes to miniaturization of the coil device 10 .

As shown in FIG. 8, the first core legs 22a (long The length L1) and the fifth core leg portion 22e (length L5) are substantially equal. Further, regarding the length in the third direction, the third core leg portion 22c (length L3) is divided into the first core leg portion 22a, the second core leg portion 22b (length L2), the fourth core leg portion 22d (length length L4), which is shorter than any of the fifth core legs 22e.

By setting the lengths of the first to fifth core leg portions 22a to 22e in the third direction as shown in FIG. 8, as shown in FIG. , depressions 21aa and 21ab narrower in the third direction than one end 21ac and the other end 21ad are formed. The first pull-out groove portion 41b, the second pull-out groove portion 42b, the third pull-out groove portion 43b, etc. of the bobbin 40 shown in FIG. 4 can be arranged in these hollow portions 21aa and 21ab. Thus, by forming the recessed portions 21aa and 21ab in the first core base portion 21a and arranging the first to third lead-out groove portions 41b to 43b and the like therein, the first to third windings 31 to 33 are formed. It is possible to reduce the size of the coil device 10 by suppressing the protrusion of the drawn portion.

As shown in FIG. 8, regarding the cross-sectional area of a cross section orthogonal to the second direction (parallel to the Z-axis), the first core leg portion 22a (cross-sectional area S1) and the fifth core leg portion 22e (cross-sectional area S5) are Approximately equal, the third core leg 22c (cross-sectional area S3) is approximately equal to the sum of the first core leg 22a and the fifth core leg 22e (cross-sectional area S1+S3). With such a relationship, the magnetic properties of the core 20 can be suitably secured. However, each of the core legs 22a-22e may be different from the eighth embodiment.

FIG. 6 is an exploded perspective view of bobbin 40 included in coil device 10 shown in FIG. As shown in FIG. 6, the bobbin 40 has a first bobbin portion 41, a second bobbin portion 42, and a third bobbin portion 43. , and the third bobbin portion 43 are separable from each other.

As shown in FIG. 2, the first to third bobbin portions 41 to 43 are arranged between a first core base portion 21a as one core base portion and a second core base portion 21b as the other core base portion. are placed in As can be understood from FIGS. 3 and 7, the first winding portion 31 a of the first winding 31 is wound around the first bobbin portion 41 . A second wound portion 32 a (see FIG. 7) of the second winding 32 is wound around the second bobbin portion 42 . A third winding portion 33 a of the third winding 33 is wound around the third bobbin portion 43 .

As shown in FIG. 8, the first to third winding portions 31a to 33a of the first to third windings 31 to 33 of the coil device 10 are at least the second to third core leg portions 22b to 22c. It is arranged between the first core base portion 21a and the second core base portion 21b so as to go around one.

As shown in FIGS. 7 and 8, the first winding portion 31a of the first winding 31 passes through the first gap 24a and the third gap 24c of the core 20, and passes through the second core leg portion 22b of the core 20. It is wound so as to surround the third core leg portion 22c.

The second winding portion 32a of the second winding 32 passes through the second gap 24b and the third gap 24c of the core 20 and is wound around the third core leg portion 22c of the core 20. As shown in FIG. Furthermore, the third winding portion 33a of the third winding 33 passes through the fourth gap 24d and the third gap 24c of the core 20 and is wound so as to surround the fourth core leg portion 22d.

3 is a schematic perspective view of the first to third windings 31 to 33 and the bobbin 40 included in the coil device 10, and FIG. 4 shows the first to third windings 31 to 33 and the bobbin 40 along the Z axis. It is a top view seen from the normal direction. As shown in FIGS. 2 to 4, the first winding 31 has a pair of first lead-out portions 31b led out from the first winding portion 31a. The first lead-out portions 31b, which are both end portions of the first winding 31, pass through the first lead-out groove portions 41b of the first bobbin portion 41 and are led out from the first bobbin portion 41 to the outside.

The second winding 32 also has a pair of second lead-out portions 32b and 32c that are led out from the second winding portion 32a. The second lead-out portion 32b, which is one of the second lead-out portions 32b and 32c, which are both ends of the second winding 32, passes through the second lead-out groove portion 42b of the second bobbin portion 42, and flows from the second bobbin portion 42 to the outside. is pulled out to The second lead-out portion 32c, which is the other of the second lead-out portions 32b and 32c, is connected to a third lead-out portion 33c of the third winding 33, as will be described later.

Further, as shown in FIG. 4, the third winding 33 has a pair of third lead-out portions 33b and 33c that are led out from the third winding portion 33a. One third lead-out portion 33b passes through the third lead-out groove portion 43b of the third bobbin portion 43 and is led out from the third bobbin portion 43 to the outside. The other third lead-out portion 33 c of the third winding 33 is connected to the other second lead-out portion 32 c of the second winding 32 through the third lead-out groove portion 43 b of the third bobbin portion 43 . Therefore, the second winding 32 and the third winding 33 are electrically properly connected.

FIG. 10 is a conceptual diagram showing the circuit of the coil device 10. As shown in FIG. As shown in FIG. 10, in the coil device 10, a portion including the first winding portion 31a and the second winding portion 32a constitutes a transformer portion, and a portion including the third winding portion 33a constitutes a resonance coil (secondary coil). (sub-resonant coil). FIG. 9 is a conceptual diagram showing magnetic flux flow (arrow 61) through the transformer portion formed in core 20 of coil device 10 and magnetic flux flow (arrow 62) through the resonance coil portion.

As shown in FIG. 9, the coil device 10 has more common magnetic paths between the transformer portion and the resonance coil portion than in the conventional composite coil device, which is advantageous in terms of miniaturization. In the coil device 10, the gap between the first core leg portion 22a and the fifth core leg portion 22e is replaced by the other second to fourth core legs without forming a magnetic path separating the transformer portion and the resonance coil portion. By making the gap smaller than the gaps 22b to 22d, it becomes difficult for the magnetic fluxes to cross each other, and the problem of interfering with each other's operations can be prevented.

In the coil device 10, by adjusting the direction of the current as shown in FIG. 10, the magnetic flux flow (arrow 61) in the transformer portion and the magnetic flux flow (arrow 62) in the resonance coil portion are reversed. more parts. In particular, in the coil device 10, in the first core leg portion 22a and the fifth core leg portion 22e, the magnetic flux flow (arrow 61) in the transformer portion and the magnetic flux flow (arrow 62) in the resonance coil portion are in opposite directions. . In the coil device 10, the magnetic fluxes are canceled by generating magnetic fluxes in opposite directions, and the cross-sectional area of each part of the core 20 can be narrowed.

However, in the coil device 10, in the first core leg portion 22a and the fifth core leg portion 22e, the magnetic flux flow (arrow 61) in the transformer portion and the magnetic flux flow (arrow 62) in the resonance coil portion are in the same direction. It may be configured as The cross-sectional area of each part of the core 20 and the direction of the current can be determined in consideration of the operating conditions of the coil device 10 and various losses.

As shown in FIG. 6, the second bobbin portion 42 has a second hollow cylinder portion 42a and a pair of second drawing groove portions 42b. A second wound portion 32a (see FIG. 7) of the second winding 32 is arranged on the outer circumference of the second hollow cylindrical portion 42a. The second bobbin portion 42 has an intermediate collar portion 42d and a second guide portion 42e formed near the lower end portion of the second hollow cylindrical portion 42a. The intermediate collar portion 42d and the second guide portion 42e guide the second winding portion 32a, which is a single-layer winding, and prevent the second winding portion 32a from being displaced in the second direction and from being unwound.

As shown in FIG. 7, the second hollow tubular portion 42a allows the third core leg portion 22c to pass therethrough. As shown in FIG. 9, the third core leg portion 22c inserted through the second hollow tubular portion 42a functions as a middle leg portion of the transformer portion of the coil device 10. As shown in FIG. Further, as shown in FIG. 7, a part of the second hollow cylindrical portion 42a arranged in the second gap 24b is provided with a second winding portion 32a for securing an insulating distance from the second core leg portion 22b of the second winding portion 32a. A cover portion 42c is attached.

The first bobbin portion 41 shown in FIG. 6 has a first hollow cylindrical portion 41a and a pair of second drawing groove portions 41b. A first wound portion 31a (see FIGS. 3 and 7) of the first winding 31 is arranged on the outer circumference of the first hollow cylindrical portion 41a. Although the first winding portion 31a has two layers, the number of turns and the number of layers of the first winding portion 31a are not limited to those of the embodiment shown in FIG.

As shown in FIGS. 5 and 7, the first hollow cylindrical portion 41a of the first bobbin portion 41 allows the second bobbin portion 42 and the second core leg portion 22b to pass therethrough. As shown in FIG. 7, at least a portion of the third core leg portion 22c, the second hollow tube portion 42a, the second winding portion 32a, and the second core leg portion 22b are located inside the first hollow tube portion 41a. be accommodated.

As shown in FIG. 4, the center of the second hollow tubular portion 42a accommodated inside the first hollow tubular portion 41a does not coincide with the center of the first hollow tubular portion 41a when viewed from the Z-axis direction. It is arranged closer to the third bobbin portion 43 than the center of the hollow cylindrical portion 41a. As a result, the X-axis negative direction side of the second hollow cylinder portion 42a away from the third bobbin portion 43 from the center of the second hollow cylinder portion 42a is formed between the inner wall of the first hollow cylinder portion 41a and the outer peripheral edge of the second hollow cylinder portion 42a. , a larger gap is formed. At least part of the second core leg portion 22b is inserted into the gap formed between the inner wall of the first hollow tubular portion 41a and the outer peripheral edge of the second hollow tubular portion 42a.

As shown in FIG. 9, the second core leg portion 22b inserted through the first hollow cylindrical portion 41a functions as a leakage adjustment leg portion of the transformer portion of the coil device 10. As shown in FIG. Shortening the length of the second gap 22ba of the second core leg 22b increases leakage in the transformer portion, and lengthening the length of the second gap 22ba decreases leakage. In addition, as shown in FIG. 7, a part of the first hollow tubular portion 41a arranged in the first gap 24a is provided with a first winding portion 31a for securing an insulating distance from the first core leg portion 22a. A cover portion 41c is attached.

The third bobbin portion 43 shown in FIG. 6 has a third hollow cylindrical portion 43a and a pair of third pull-out groove portions 43b. A third wound portion 33a (see FIGS. 3 and 7) of the third winding 33 is arranged on the outer circumference of the third hollow cylindrical portion 43a. Although the third winding portion 33a has two layers, the number of turns and the number of layers of the third winding portion 33a are not limited to those of the embodiment shown in FIG.

As shown in FIGS. 4 and 7, the third hollow cylindrical portion 43a of the third bobbin portion 43 allows the fourth core leg portion 22d to pass therethrough. As shown in FIG. 9, the fourth core leg portion 22d through which the third hollow cylindrical portion 43a is inserted functions as a middle leg portion of the resonance coil portion of the coil device 10. As shown in FIG. As shown in FIG. 7, part of the third hollow cylindrical portion 43a arranged in the fourth gap 24d is provided with a third winding portion 33a for securing an insulating distance from the fifth core leg portion 22e of the third winding portion 33a. A cover portion 43c is attached. A third cover portion 43c is attached to another part of the third hollow cylindrical portion 43a disposed in the third gap 24c to ensure an insulating distance of the third winding portion 33a from the first winding 31. ing.

As shown in FIGS. 4 and 7 , the first bobbin portion 41 and the third bobbin portion 43 are arranged adjacent to each other in the third gap 24 c of the core 20 . As shown in FIG. 4, the other end of the third pull-out groove portion 43b of the third bobbin portion 43 extends toward the first bobbin portion 41 along the first direction. Both the second lead-out groove portion 42b and the third lead-out groove portion 43b are arranged on the Y-axis negative direction side with respect to the first core base portion 21a.

The material of the core 20 of the coil device 10 is not particularly limited, but examples thereof include soft magnetic materials such as ferrite and metal. For example, the first core portion 20a and the second core portion 20b can be produced by molding powder of ferrite, metal, or the like into a predetermined shape. Moreover, the material of the bobbin 40 is not particularly limited, but an insulating resin or the like can be mentioned. For example, the first to third bobbin portions 41 to 43 are produced by molding a material such as resin by injection molding or the like.

In the description of the core 20 and the bobbin 40 of the coil device 10, the term "separable" means that the coil device 10 is assembled from a separate state rather than being integrated in the assembly process. The device 10 is not limited to those that are not fixed to other members by adhesion or the like. Members in a "separable" relationship include those that are assembled from a separated state and fixed to other members by adhesion or the like during or after assembly.

The first to third windings 31 to 33 of the coil device 10 are not particularly limited, but examples thereof include covered conductors having conductor parts such as copper. As the first to third windings 31 to 33, a single wire may be used, or a twisted wire such as a litz wire may be used.

The coil device 10 described above can compactly connect the second winding 32 and the third winding 33 inside the coil device 10 . However, unlike the embodiment shown in FIG. 8, the second winding 32 and the third winding 33 may not be connected inside the coil device 10 . In this case, the second winding 32 and the third winding 33 are connected via a substrate or the like on which the coil device 10 is mounted, thereby forming a circuit similar to the circuit shown in FIG.

The coil device 10 uses the core 20 having the first to fifth core leg portions 22a to 22e to arrange the first to third winding portions 31a to 33a at predetermined positions among the first to fourth gaps 24a to 24d. By arranging so as to pass through, it is possible to assemble in a simple process, which is advantageous for miniaturization and low profile. That is, since all of the first to fifth core leg portions 22a to 22e are arranged between the pair of core base portions 21a and 21b, assembly can be performed in a simple process, which is advantageous for miniaturization and low profile. . In addition, since all of the first winding portion 31a, the second winding portion 32a and the third winding portion 33a pass through the third gap 24c of the core 20, the size of the core 20 can be reduced and the winding length can be reduced. is advantageous from the viewpoint of shortening the

In addition, since the coil device 10 has a structure in which the mutually separable first to third bobbin portions 41 to 43 are arranged between the pair of core base portions 21a and 21b, it can be assembled in a simple process. It is advantageous for miniaturization and low profile.

Although the coil device 10 according to the present invention has been described above with reference to the embodiments, the technical scope of the present invention is not limited to the above-described embodiments. Needless to say, it contains many examples. For example, the coil device 10 may have a case 50 (see FIG. 8) that houses the core 20, the bobbin 40, etc., and has a potting resin or the like that fixes the core 20, the bobbin 40, etc. to the case 50. may

Further, in the coil device 10 shown in the embodiment, as shown in FIG. 10, the second winding portion 32a and the third winding portion 33a are connected in series, and the first winding portion 31a constitutes the primary side. The second winding portion 32a and the third winding portion 33a constitute the secondary side. However, unlike this, the first winding portion 31a and the third winding portion 33a are connected in series, the first winding portion 31a and the third winding portion 33a constitute the primary side, and the third winding portion 33a constitutes the primary side. A coil device in which the second winding portion 32a constitutes the secondary side is also one of the embodiments of the present invention. In such an embodiment, for example, the third lead portion 33c shown in FIG. 8 and one of the first lead portions 31b are electrically connected.

DESCRIPTION OF SYMBOLS 10... Coil apparatus 20... Core 20a... 1st core part 20b... 2nd core part 21... Core base part 21a... 1st core base part 21ac... One end part 21ad... The other end part 21aa, 21ab... Hollow part 21b Second core base portion 21bc One end portion 21bd Other end portion 22 Core leg portion 22a First core leg portion 22b Second core leg portion 22ba Second gap 22c Third core leg portion 22ca Third gap 22d Fourth core leg portion 22da Fourth gap 22e Fifth core leg portion 24a First gap 24b Second gap 24c Third gap 24d Fourth gap D1 First direction D2 Second direction D3 Third direction 31 First winding 31a First winding 31b First lead-out 32 Second winding 32a Second winding 32b, 32c Second lead-out 33 Third winding 33a Third winding portion 33b, 33c Third drawing portion 40 Bobbin 41 First bobbin portion 41a First hollow cylindrical portion 41b First drawing groove portion 41c First cover portion 42 Third 2 bobbin part 42a... 2nd hollow cylinder part 42b... 2nd drawer groove part 42c... 2nd cover part 42d... intermediate collar part 42e... 2nd guide part 43... 3rd bobbin part 43a... 3rd hollow cylinder part 43b... 3rd Drawer groove portion 43c Third cover portion 50 Case

Claims (12)

At least one of a pair of core base portions extending in a first direction and arranged substantially parallel to each other with a predetermined spacing in a second direction perpendicular to the first direction, and the pair of core base portions. The first core base portion protrudes from one side to the other side and is arranged along the first direction at intervals from one end of the core base portion to the other end in the first direction. a core leg having a core leg, a second core leg, a third core leg, a fourth core leg and a fifth core leg;
a first gap formed between the first core leg portion and the second core leg portion; and a third gap formed between the third core leg portion and the fourth core leg portion. a first winding having a first winding portion wound so as to surround the second core leg portion and the third core leg portion;
A second winding that passes through a second gap formed between the second core leg portion and the third core leg portion and the third gap and is wound so as to surround the third core leg portion. a second winding having a portion;
A third winding that passes through a fourth gap formed between the fourth core leg portion and the fifth core leg portion and the third gap and is wound so as to surround the fourth core leg portion. a third winding having a portion;
A coil device comprising a bobbin around which the first winding portion, the second winding portion, and the third winding portion are wound. 2. The coil device according to claim 1, wherein said second winding and said third winding are electrically connected. The bobbin includes a first bobbin portion around which the first winding portion is wound, a second bobbin portion around which the second winding portion is wound, and a second bobbin portion around which the third winding portion is wound. 3. The coil device according to claim 1, further comprising three bobbin sections, wherein the first bobbin section, the second bobbin section, and the third bobbin section are separable from each other. . The second bobbin portion has a second hollow cylindrical portion through which the third core leg portion is inserted,
The first bobbin portion has a first hollow cylindrical portion through which the second bobbin portion and the second core leg portion are inserted,
4. The coil device according to claim 3, wherein the third bobbin portion has a third hollow tubular portion through which the fourth core leg portion is inserted. The coil device according to claim 3 or 4, wherein the first bobbin portion and the third bobbin portion are adjacent to each other at the third gap. The distance along the first direction from the one end of the core base portion to the third core leg is greater than the distance along the first direction from the other end to the third core leg 6. A coil arrangement as claimed in any one of claims 1 to 5, which is short. The coil device according to any one of claims 1 to 6, wherein the third gap is wider than the second gap in terms of width along the first direction. 8. Any one of claims 1 to 7, wherein the first core leg portion and the fifth core leg portion are substantially equal in length in a third direction perpendicular to the first direction and the second direction. Coil device as described. With respect to lengths in a third direction perpendicular to the first direction and the second direction, the third core leg consists of the first core leg, the second core leg, the fourth core leg and the third core leg. 9. A coil arrangement as claimed in any one of claims 1 to 8, characterized in that it is shorter than any of the five core legs. The first core leg portion and the fifth core leg portion have substantially the same cross-sectional area in a cross section perpendicular to the second direction, and the third core leg portion has the same cross-sectional area as that of the first core leg portion and the fifth core leg portion. 10. A coil arrangement according to any one of claims 1 to 9, characterized in that it is approximately equal to the sum of the legs. A second gap is formed in the second core leg, a third gap is formed in the third core leg, and a fourth gap is formed in the fourth core leg. and wherein the length of the third gap in the second direction is shorter than the lengths of the second gap and the fourth gap in the second direction. The coil device according to . At least one of a pair of core base portions extending in a first direction and arranged substantially parallel to each other with a predetermined spacing in a second direction perpendicular to the first direction, and the pair of core base portions. protrudes from one side to the other side, and is arranged along the first direction at a predetermined interval from one end of the core base portion toward the other end in the first direction. a first core portion having a first core leg portion, a second core leg portion, a third core leg portion, a fourth core leg portion and a fifth core leg portion, including at least one of the core base portions; and at least the other a core that is separable into a second core portion including a core base portion of
A first bobbin portion disposed between one core base portion and the other core base portion, on which a first winding portion of a first winding is wound, and a second winding portion of a second winding. a second bobbin portion around which the winding portion is wound; and a third bobbin portion around which the third winding portion of the third winding is wound, wherein the first bobbin portion and the second bobbin portion and a bobbin in which the third bobbin portion is separable from each other.

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