JPH11251164A - Compact choke coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a choke coil in which the fitting area and height can be made small, even if the number of coil windings is large and which is formed of bandl conductor. SOLUTION: A coil 1 has a core inserting hole 6, and it is comprised of vortex-like coils 4 and 5 of upper and lower 2 steps formed of band conductor 3, using the core insertion hole 6 as a winding shaft. the winding directions of the coils 4 and 5 are reverse to each other, and leads 4a and 5a are applied to the outer peripheral ends of the coils respectively. A set of cores 2 is assembled in the coil 1, forming a choke coil, and thus an applied current is allowed to flow in the coils 4 and 5 connecting continuously without connection, and then it flows out in the lead 5a as an output terminal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply mounted on various electronic devices or a choke coil which is a mounting part of a power supply portion.

[0002]

2. Description of the Related Art Conventionally, a choke coil capable of conducting a relatively large current is a twisted wire using a large number of copper wires or thin wires having a round cross section. In recent years, a coil using the band-shaped conductor 21 shown in FIGS. 9 and 10 has been used due to the winding workability of the thick wire diameter and the low coil winding space factor.

The coil composed of the strip-shaped conductor 21 shown in FIG. 9 is a coil spirally wound in a vertical direction with the core insertion hole 22 as a winding axis. The coil formed of the band-shaped conductor 21 in FIG. 10 is a coil wound spirally in the horizontal direction with the core insertion hole 22 as a winding axis. These coils have good winding workability by using the band-shaped conductor 21, and can increase the space factor of the bobbin. Each of the coils is incorporated into a core to form a choke coil.

[0004]

As a method of obtaining a larger inductance value with a choke coil using the above-mentioned coil, it can be easily coped with by increasing the number of turns of each coil. A problem has occurred.

In the coil shown in FIG. 9, the coil height (thickness) increases as the number of coil turns increases. If a thin conductor is used, the coil height can be kept low. However, due to the thinning of the plate, the conductor breakage is likely to occur during the winding operation due to the difference in winding stress between the outer peripheral side and the inner peripheral side. The inductance value can be easily increased by stacking and using a plurality of coils shown in FIG. 9, but the direct current resistance increases due to the contact resistance of the connection points between the coils, which causes a decrease in efficiency when the choke coil is used. It became.

Further, in the coil of FIG. 10, even if the number of coil turns is increased to increase the inductance value, it can be dealt with without changing the coil height. The circuit area has also increased, and the power supply has become larger. Leads were required to be drawn out from the inner peripheral side of the coil, and the number of steps was increased due to the forming operation of the drawer due to the smaller diameter of the coil and the thicker conductor.

The present invention solves the above-mentioned problems of the conventional coil composed of a strip-shaped conductor, and uses a strip-shaped conductor that can be compact in mounting area and height even when the number of turns of the coil is large. To provide a choke coil.

[0008]

The present invention relates to a choke coil using a coil made of a core made of a magnetic material and a band-shaped conductor, wherein the coil made of the band-shaped conductor has a two-stage structure in which a core insertion hole is provided on the inner periphery. The spiral coil of the above 2
The spiral coil of the stepped structure is wound in the opposite direction with respect to the winding direction with the core insertion hole as the winding axis, and the spiral coil of the two-stage structure is formed of one band-shaped conductor. This is a small choke coil.

The present invention also relates to a choke coil using a coil made of a core made of a magnetic material and a band-shaped conductor, wherein the coil made of the band-shaped conductor is a two-stage spiral coil having a core insertion hole provided on the inner periphery. The spiral coil of the two-stage structure has winding directions opposite to each other with the core insertion hole as a winding axis, and the spiral coil of the two-stage structure includes:
This is a small choke coil that is connected electrically and mechanically in a non-connected state and has the coil incorporated in a core.

The present invention also relates to a choke coil using a coil made of a core made of a magnetic material, a strip-shaped conductor, and a base made of an insulating resin, wherein the coil made of the strip-shaped conductor has a two-stage spiral shape having a core insertion hole. The spiral coil has a winding direction in which the winding direction is opposite to the core insertion hole, and the two-stage spiral coil is formed by winding one band-shaped conductor. Has a height lower than the height of the core, has two lead-out grooves for the coil on one side surface, and incorporates the core and the coil. The coil terminals are respectively pulled out from the lead-out grooves below the base, and are connected to the circuit. This is a small choke coil that serves as a connection part.

The present invention also relates to a choke coil using a coil made of a core made of a magnetic material, a strip conductor, and a base made of an insulating resin, wherein the coil made of the strip conductor has a two-stage spiral shape having a core insertion hole. The spiral coil has a winding direction in which the winding direction is opposite to the core insertion hole, and the two-stage spiral coil is formed by winding one band-shaped conductor. Is a small choke coil in which at least one lead-out groove is formed on an arbitrary side surface, a core and the coil are incorporated, and coil ends are respectively drawn out below the base from the lead-out groove and serve as connection parts to a circuit. .

A two-stage spiral coil composed of a band-shaped conductor used in the present invention is a small choke coil in which the exposed surface of the conductor is covered with an insulating resin except for connection terminals.

Further, the two-stage spiral coil composed of the strip conductor of the present invention is a small choke coil in which the spiral coil is covered with an insulating resin except for a connection terminal.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. The choke coil according to the present invention comprises a combination of a coil 1 and a core 2. The coil 1 has a core insertion hole 6, and the upper and lower two-stage spiral coil 4 composed of the band-shaped conductor 3 with the core insertion hole 6 as a winding axis. The spiral coils 4 and 5 have winding directions opposite to each other, and lead 4a, 5
a is given. When a set of cores 2 is incorporated into the coil 1 to form a choke coil, and the lead 4 a is used as an input terminal in FIG. 1, the applied current will cause the spirally wound strip-shaped conductor 3 of the coil 4 to have an inner diameter. It flows vortexly toward the side and is energized to the coil 5 through the intermediate coil 7 connecting the coil 4 and the coil 5 shown in FIG. Also,
In the coil 5, the current flows in the spirally wound strip-shaped conductor 3 toward the outer periphery in a spiral manner, and flows out to the lead 5a serving as an output terminal.

As described above, the coil 1 composed of the spiral coils 4 and 5 having different winding directions causes the current flowing through the coil 1 to spiral from the coil outer circumference to the coil inner circumference and from the coil inner circumference to the coil outer circumference. The direction of the flow and the exciting magnetic flux generated from the spiral coils 4 and 5 are the same, and a magnetic flux is generated in the core 2 incorporated in the coil 1 to obtain an inductance as a choke coil.

Further, in the choke coil of the present invention, the coil 1 made of one strip-shaped conductor can use both a horizontally extending winding form and a vertically extending winding form, and the conventional coil made of a strip-shaped conductor can be used. As compared with the choke coil using the coil, the mounting space can be made compact. Further, the ends of the strip-shaped conductors, which are members of the coil 1, are respectively located on the outer periphery of the coil as leads of the coil 1, and forming is easy. The lead lead-out location can also be freely set.

The spiral coil 4 constituting the coil 1
5 and the intermediate coil 7 connecting them are electrically and mechanically connected without any connection, so that the choke coil can be a low-resistance choke coil without being influenced by the contact resistance generated at the connection portion. .

[0018]

FIG. 3 shows a coil obtained by winding a coil formed of a band-shaped conductor 3 into a substantially elliptical shape. The choke coil can have a rectangular mounting area, and is suitable for the mounting area. I was able to. The coil shape of the strip-shaped conductor used in the choke coil of the present invention can be square, rectangular, triangular, or the like, in addition to the above-mentioned circular shape or substantially elliptical shape. The choke coil with the best mounting efficiency could be obtained by adopting the shape according to.

FIG. 4 shows an embodiment of the present invention having a base 12 made of resin. FIG. 5 is an exploded perspective view of FIG. FIG. 4 shows a choke coil corresponding to the surface mounting. The coil terminals 11 are respectively drawn out from lead-out grooves 13 formed on one side surface of the base 12, and routed along the side surface of the base 12 to the lower surface of the base 12. Thus, it becomes a connection portion 14 with the circuit. When the base 12 has a frame shape, the height of the frame is lower than that of the core, and a core insertion hole 15 is provided at the center of the bottom surface.
The core height = choke coil height can be determined without being affected by the height dimension of the base 12, and a thin choke coil having a reduced height dimension can be obtained. In FIG. 5, the coil 1 is formed before the coil 1 is attached to the base 12, but the coil 1 may be formed after the coil 1 is attached to the base 12.

In the figure, the lead-out groove 13 of the coil terminal 11 is formed only on one side of the base 12,
Providing a lead-out groove on an arbitrary side surface of the base 12 and pulling out the coil terminals, respectively, can be easily performed since the coil terminals of the choke coil of the present invention are located on the outer periphery. The distance between the terminals can be made long, and by providing a plurality of lead-out grooves in the base, the terminal position can be adjusted to the circuit.
You.

Further, by providing auxiliary terminals for fixing in advance on the base 12, the fixing against vibrations and the like can be strengthened and the reliability can be improved. In the choke coil shown in FIG. 4, the coil, the core, and the base were mutually bonded and fixed.

FIG. 6 shows that the surface of the strip-shaped conductor 3 is
FIG. 2 is a partial cross-sectional view of a two-stage spiral coil used in the choke coil of the present invention, which is thin-film coated with a conductor. Adjacent conductor surfaces are each insulated with resin, and interlayer insulation of the coil is secured to improve reliability. Was. The coating on the surface of the band-shaped conductor 3 is obtained by coating the surface of the band-shaped conductor with an insulating resin before winding the coil.

FIG. 7 shows a two-stage spiral coil used for the choke coil of the present invention, in which the strip-shaped conductor 3 is covered with an insulating resin 17 to cover the entire coil or the coil sheath. Potting, insert molding, and the like were used as methods of covering the entire coil, and interlayer insulation of the coil was achieved by infiltrating the resin into the coil exterior and the coil winding layer. Further, since the coil is entirely covered with the resin, the coil has good heat dissipation and the current density of the coil (conductor) can be increased, and the coil can be reduced in size and thickness.

As another method of covering the coil sheath, there is a method of covering only the coil sheath with a resin by coating or the like. In this case, since there is almost no resin penetration into the coil winding layer, the conductor surface shown in FIG. Coating is performed on the coil exterior using a coil provided with an insulation coating, and a thicker insulating layer is provided on the coil exterior.

By the resin filling or resin coating shown in FIG. 7, the insulation of the coil can be remarkably improved, and the coil can be formed into a molded body. It was able to improve dramatically.

FIG. 8 shows the base 1 shown in FIG. 4 and FIG.
2 is a choke coil of the present invention using a box-shaped base 18 having no hole 15 on the bottom surface. The base 18 can inject resin into the box, and can firmly fix the core, coil, and base. The heat radiation from the coil or the core can be improved by the resin in the base 18.

The coil used in the choke coil of the present invention has winding frames in the horizontal and vertical directions with the core insertion hole as a winding axis, and is not limited to a spiral coil having a two-stage structure. If necessary, a spiral coil in the vertical direction of three stages, four stages, and n stages can be manufactured from one band-shaped conductor, and is applicable not only to a small choke coil but also to a large choke coil, and a highly versatile coil. Structure.

[0028]

According to the present invention, since the coil of the choke coil has the bobbin in the horizontal and vertical directions with respect to the winding axis,
Since the coil shape can be made appropriate according to the core shape or the mounting space, the size can be reduced as compared with a conventional choke coil using a coil formed of a band-shaped conductor. In addition, the two-stage spiral coil has a low resistance because the spiral coil is formed of one band-shaped conductor and is continuously connected in a non-connected state. Furthermore, since the coil winding terminal is located on the outer periphery of the coil, it is easy to perform lead forming work. By performing insulation treatment on the conductor or coil, the reliability is improved, and the coil is not loosened, etc. It was easy to handle time.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a choke coil according to the present invention.

FIG. 2 is an exploded perspective view of a coil used in the choke coil of the present invention.

FIG. 3 is another embodiment of the coil used in the choke coil of the present invention.

FIG. 4 shows a second embodiment of the choke coil of the present invention.

FIG. 5 is an exploded perspective view of a choke coil according to a second embodiment of the present invention.

FIG. 6 is a partial sectional view of a coil used in the choke coil of the present invention.

FIG. 7 is a partial sectional view of a coil used in the choke coil of the present invention.

FIG. 8 shows a choke coil according to a second embodiment of the present invention.

FIG. 9 shows a coil used for a conventional choke coil.

FIG. 10 shows another coil used for a conventional choke coil.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 coil 2 core 3 strip conductor 4 spiral coil 4 a lead 5 spiral coil 5 a lead 6 core insertion hole 7 intermediate coil

[Procedure amendment]

[Submission date] March 31, 1999

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

[0008]

The present invention relates to a choke coil using a coil made of a core made of a magnetic material and a band-shaped conductor, wherein the coil made of the band-shaped conductor has a two-stage structure in which a core insertion hole is provided on the inner periphery. The spiral coil of the above 2
The spiral coil of the stepped structure has winding directions opposite to each other with the core insertion hole as a winding axis, and the spiral coil of the two-stage structure is constituted by one band-shaped conductor by an intermediate coil connecting them . This is a small choke coil in which the coil is incorporated in a core.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction contents]

The present invention also relates to a choke coil using a coil made of a core made of a magnetic material and a band-shaped conductor, wherein the coil made of the band-shaped conductor is a two-stage spiral coil having a core insertion hole provided on the inner periphery. The spiral coil of the two-stage structure has winding directions opposite to each other with the core insertion hole as a winding axis, and the spiral coil of the two-stage structure includes:
A small choke coil characterized by being continuously connected electrically and mechanically in a disconnected state by an intermediate coil connecting them, and incorporating the coil in a core.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction contents]

The present invention also relates to a choke coil using a coil made of a core made of a magnetic material, a strip-shaped conductor, and a base made of an insulating resin, wherein the coil made of the strip-shaped conductor has a two-stage spiral shape having a core insertion hole. In the coil, the winding directions of the spiral coil are opposite to each other with the core insertion hole as a winding axis, and the two-stage spiral coil is formed by winding one band-shaped conductor by an intermediate coil connecting them . Turn the base , and the base
Has a lower height than the surrounding core height, one aspect derives groove of the coil is performed two to incorporate core and the coil, the coil terminal, the lower base than each of the lead grooves
It is a small choke coil that is drawn out to the surface and serves as a connection part to a circuit.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction contents]

The present invention also relates to a choke coil using a coil made of a core made of a magnetic material, a strip conductor, and a base made of an insulating resin, wherein the coil made of the strip conductor has a two-stage spiral shape having a core insertion hole. In the coil, the winding directions of the spiral coil are opposite to each other with the core insertion hole as a winding axis, and the two-stage spiral coil is formed by winding one band-shaped conductor by an intermediate coil connecting them . Turn the base , and the base
At least one or more outlet grooves are provided on any surrounding side,
A small choke coil in which a core and the coil are incorporated, and a coil terminal is drawn out from the lead-out groove to a lower surface of the base and serves as a connection portion to a circuit.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Deleted

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Deleted

[Procedure amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction contents]

FIG. 4 shows an embodiment of the present invention having a base 12 made of resin. FIG. 5 is an exploded perspective view of FIG. FIG. 4 shows a choke coil corresponding to the surface mounting. The coil terminals 11 are respectively drawn out from lead-out grooves 13 formed on one side surface of the base 12 and routed along the side surface of the base 12 to the lower surface of the base 12. Thus, it becomes a connection portion 14 with the circuit. When the base 12 has a frame shape, the height of the frame is lower than that of the core, and a core insertion hole 15 is provided at the center of the bottom surface.
Without being affected by the height of the base 12, can be the core height = choke coil height, to further base
Encloses the core and coil to ensure insulation from surrounding elements
And a thin choke coil with reduced height
I was able to. Also, in FIG. 5, the coil 1 is formed before the coil 1 is attached to the base 12, but the coil 1 is
Forming after attaching to 2 may be carried out.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI H01F 27/28 H01F 27/28 A 27/32 27/32 Z

Claims (6)

[Claims] 1. A choke coil using a coil made of a core made of a magnetic material and a strip-shaped conductor, wherein the coil made of a strip-shaped conductor is a two-stage spiral coil having a core insertion hole provided on an inner periphery thereof. The two-stage spiral coil has a winding direction opposite to the winding direction with the core insertion hole as a winding axis,
Further, the small-sized choke coil is characterized in that the two-stage spiral coil is formed of one band-shaped conductor, and the coil is incorporated in a core. 2. A choke coil using a coil made of a core made of a magnetic material and a strip-shaped conductor, wherein the coil made of a strip-shaped conductor is a two-stage spiral coil having a core insertion hole provided on an inner periphery thereof. The two-stage spiral coil has a winding direction opposite to the winding direction with the core insertion hole as a winding axis,
The small-sized choke coil is characterized in that the two-stage spiral coil is continuously connected electrically and mechanically in a disconnected state, and the coil is incorporated in a core. 3. A choke coil using a core made of a magnetic material, a coil made of a strip conductor, and a base made of an insulating resin, wherein the coil made of the strip conductor is a two-stage spiral coil having a core insertion hole. The spiral coil has winding directions opposite to each other with the core insertion hole as a winding axis, and the two-stage spiral coil is formed by winding one band-shaped conductor, and the base has a core height. Height is less than the height, two lead-out grooves of the coil are provided on one side,
A small choke coil in which a core and the coil are incorporated, and a coil terminal is pulled out from the lead-out groove below the base and serves as a connection portion to a circuit. 4. A choke coil using a core made of a magnetic material, a coil made of a strip conductor, and a base made of an insulating resin, wherein the coil made of the strip conductor is a two-stage spiral coil having a core insertion hole. The spiral coil has a winding direction opposite to the winding direction with the core insertion hole as a winding axis, and the spiral coil having the two-stage structure is formed by winding one band-shaped conductor, and the base is arbitrary. A small choke coil characterized in that at least one lead-out groove is provided on a side surface, a core and the coil are incorporated, and coil ends are respectively drawn out from the lead-out groove below a base and become connection parts to a circuit. . 5. A small-sized coil having a two-stage structure comprising a strip-shaped conductor according to any one of claims 1 to 4, wherein an exposed surface of the conductor is covered with an insulating resin except for connection terminals. choke coil. 6. The small choke coil according to claim 1, wherein the spiral coil having a two-stage structure comprising the strip-shaped conductor is covered with an insulating resin except for the connection terminal. .