JPH11345721A - Surface mounted type compact coil component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide thin and compact coil parts reducing the resistance of a high current coil. SOLUTION: After fitting a printed coil 2 and a core 4 having legs to a bobbin 3 provided with pin terminals 9 on one side face and deriving grooves 8 on the other side face, an edgewise coil 1 around which a conductor is wound is integrated in the core 4 and the deriving grooves 8 of the bobbin 3, a core 5 is combined with the other core 4 while compressing the coil 1 and taper parts 10 formed on four corners of the bobbin 3 are coated with adhesive to mutually fix the bobbin 3 and the cores 4, 5. The coil terminals of the coil 1 drown out from the grooves 8 and the lower extending parts of the pin terminals 9 are used for the circuit connection terminals of the coil parts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer and a choke coil which are coil components used for a power supply mounted on various electronic devices.

[0002]

2. Description of the Related Art In recent years, coil components such as transformers and choke coils have been reduced in size due to miniaturization of equipment used and distributed power sources.
Demand is growing. Further, the structure of the coil component has also changed from a coil using a circular cross-section wire to a printed coil using copper foil, and the printed coil is
The required number of coil turns is obtained by lamination, and for relatively large currents, the printed coil is connected in parallel or a one-turn coil punched out of a copper plate is connected to increase the current capacity of the coil. It corresponds.

FIG. 5 is a diagram showing the connection of the one-turn coil. 1 by a method such as punching a conductor such as a copper plate.
The turn coils 21, 22, and 23 are manufactured, and a plurality of the one-turn coils are connected to form a high-current coil as a coil component.

[0004]

SUMMARY OF THE INVENTION In the conventional configuration,
By using the one-turn coil shown in FIG. 5 as the coil of the coil component, the size of the coil component can be reduced.
The problem occurred with the contact resistance at the connection part 25 with the terminal. That is, the contact resistance of the connection portions 24 and 25 has little effect if the current flowing through the coil is small, but the larger the current, the greater the loss due to the contact resistance, which lowers the efficiency as a coil component. Local heat was sometimes generated.

[0005] In addition, the coil connection in FIG. 5 is performed by a connection operation using solder or the like. In a continuity test by inspection, even if the connection is a point contact, a good product is determined.
Extremely careful connection work was required, and the number of inspection items needed to be increased in comparison with other products, which hindered work efficiency.

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned problems and to provide a coil part which reduces the efficiency reduction caused by the coil and has good workability.

[0007]

SUMMARY OF THE INVENTION The present invention uses two or more coils, a bobbin, and a set of cores made of a magnetic material, and at least one coil has a wide surface of a rectangular conductor with respect to a winding axis. An edgewise coil which is wound vertically, and is a surface-mounted small coil component in which the edgewise coil and another planar coil are incorporated in a core in a laminated manner.

Further, the present invention uses a set of cores made of two or more coils, a bobbin, and a magnetic material, and at least one coil is formed by winding a wide surface of a rectangular conductor perpendicular to a winding axis. The edgewise coil is a small surface mount type coil component that is suppressed by a set of cores incorporating a spring-like repulsion.

Further, the present invention provides the above-mentioned surface-mounted small-sized coil component, wherein at least one coil is constituted by an edgewise coil and the other coil is constituted by a printed coil or a plane-wound coil composed of a round or square wire. is there.

Further, the present invention is the above-mentioned surface-mounted small coil component, wherein the edgewise coil is a choke coil for blocking AC, and the other coil is a modified coil for supplying power to the driving element.

Further, the present invention is the above-mentioned surface-mounted small coil component, wherein the edgewise coil constitutes a transformer as a high current side coil and the other coils constitute a transformer as a low current side coil.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The coil component of the present invention can be a coil having no connection portion by soldering or the like by forming a coil for high current with one conductor. As the conductor, a band-shaped conductor was used as a material, and a wide surface of the band-shaped conductor was set in a direction perpendicular to a winding axis to form an edgewise coil wound spirally.

The coil has a helical spring-like repulsive force. By applying a force from both ends, a laminated structure in which adjacent helical conductors are in close contact with each other can be formed. By using in combination,
The coil part of the coil component can be made thin. Furthermore, by forming the terminal on the high current side with the terminal of the edgewise coil, unnecessary contact resistance was removed to make the coil low in resistance, and the reduction in efficiency due to the coil could be reduced.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG.
FIG. 2 is an exploded perspective view of the coil component of the present invention. The edgewise coil 1 is formed by winding a rectangular conductor with the wide surface of the conductor perpendicular to the coil winding axis, and pulling out a coil terminal in the same direction. As a low current coil combined with the edgewise coil 1, a printed coil 2
It was used. The coil 2 forms a spiral coil pattern 6 on each of the front and back surfaces of the base material, and connects the coils on both surfaces by through holes. The bobbin 3 has a frame shape,
On one end face side, a lead-out groove 8 of the coil terminal of the edgewise coil 1 is provided in a stepped manner in accordance with the drawing of the coil terminal of the edgewise coil 1, and a pin terminal 9 for connecting the print coil 2 is provided upright on the opposite side surface. .

Referring to the exploded view of FIG. 1, the method of assembling the coil component of the present invention will be described. The print coil 2 is set on the bobbin 3, and the pin terminals 9 of the bobbin 3 and the mounting holes 7 of the print coil 2 are soldered. Attached. Thereafter, the core 4 having a leg portion is assembled, the edgewise coil is inserted into the middle leg of the core 4, and then the core 5 is assembled. The edgewise coil 1 is sandwiched between the cores 4 and 5 to form a laminated structure in which the helical conductor is in close contact, and is housed in the core as a thin coil.

FIG. 2 and FIG. 3 are external views of the coil component of the present invention. In the coil component assembled from FIG. 1, an adhesive is applied to the tapered portions 10 at the four corners of the bobbin 3, and the bobbin 3, the core 4, and the core 5 are bonded and fixed to each other.

A coil terminal of the edgewise coil 1 is drawn out from a lead-out groove 8 formed on one end surface of the bobbin 3 and is routed along the side surface of the bobbin to the bottom surface of the bobbin to form a surface mounting terminal 11. . On the other hand, below the pin terminal 9 to which the printed coil 2 is connected is a flat surface mounting terminal 12 along the bottom surface of the bobbin.

Each of the coils of the coil component needs to be insulated, and the edge-wise coil may be coated with a resin on the surface of the conductor, or may be made by laminating the conductor in advance and wrapping the entire coil with resin. In the latter case, when a thick conductor is used as an edgewise coil, the spring structure has a large repulsion force, and this is the most effective method in consideration of workability in manufacturing coil components.

When the low-current type is composed of a printed coil, the coil pattern surface is covered with a resin coat or the coil pattern is covered with a film to insulate other coils and cores. Further, in the case of a flat wound coil, it is preferable to use a fusion wire in which an adhesive layer is applied to an exterior to maintain its shape,
Furthermore, the fused electric wire having a tube does not require the use of an insulator such as a film, and can simplify the structure.

Next, the specifications of the choke coil, which is a small and low-profile coil component created based on the above description, will be described.
The core was made of a low-loss Mn-based ferrite material ML14D manufactured by Hitachi Metals, Ltd., and had the same shape as the cores 4 and 5 in FIG. The choke coil has a width of 2.5 mm, 2
4-turn edgewise coil 1 with 50 μm strip conductor
A 14-turn printed coil 2 was used as a coil for supplying power for driving the IC. The exterior of the edgewise coil 1 was coated with polyester, and the printed coil 2 covered the coil pattern with a Kapton film to ensure the insulation of each.

The choke coil is a choke whose edge-wise coil aims to block an AC component, and the printed coil is a transformation coil which supplies power obtained from the choke coil as an auxiliary coil to a driving element such as an IC.

The DC resistance of each coil of the coil component is:
The edgewise coil 1 of the choke coil is 2.3 mΩ,
The power supply printed coil 2 has a resistance of 1.2Ω, and the choke coil for supplying a high current has a low resistance value because there is no connection between terminals. Further, this coil component was a small choke coil for 40 W, having a height of about 18 mm square and a height of 5.5 mm, and was small and thin.

FIG. 4 shows another embodiment of the present invention, which is a coil component in which a stepped gap 14 is provided on a middle leg of an E-shaped core 13. Due to the stepped gap 14, the coil component exhibited an L-shaped DC superposition characteristic with respect to the DC current, and was able to reduce power consumption when no load or light load was applied to the power supply.

The coil component of the present invention is also suitable for a transformer, and the high current side coil is constituted by an edgewise coil, and the low current side coil is constituted by a planar coil such as a printed coil or a flat wound coil. Since the side coil has no contact resistance other than the terminal portion, the efficiency of the transformer can be improved as a low resistance, and a small and low-profile transformer can be obtained by stacking the coil with a small thickness.

[0025]

According to the present invention, the high-current coil and the terminal of the coil component are constituted by an edgewise coil made of one conductor, so that the resistance can be made lower than ever before, and the efficiency caused by the coil can be reduced. The decrease could be reduced. Further, since the high-current coil has no connection other than the terminal, the number of inspection steps can be reduced, and workability can be improved. In addition, by using a planar coil as a coil that can be combined with the edgewise coil, a small-sized coil component having a low profile can be created.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a coil component of the present invention.

FIG. 2 is an external view of a coil component of the present invention.

FIG. 3 is an external view of a coil component of the present invention.

FIG. 4 is a perspective view of another embodiment of the coil component of the present invention.

FIG. 5 shows a large current coil used for a conventional coil component.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Edgewise coil 2 Print coil 3 Bobbin 4, 5 Core 6 Coil pattern 7 Mounting hole 8 Outlet groove 9 Pin terminal 10 Tapered part

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[Procedure amendment]

[Submission date] June 3, 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] 0007

[Correction method] Change

[Correction contents]

The present invention uses two or more coils, a bobbin, and a set of cores made of a magnetic material, and at least one coil is formed by winding a wide surface of a rectangular conductor perpendicular to a winding axis. An edgewise coil, wherein the edgewise coil is a close-contact laminated coil with suppressed spring-like repulsion.
Te, surface mount miniature coil component comprising incorporating in layers to another of the planar coil and the core.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

Further, the present invention uses a set of cores made of two or more coils, a bobbin, and a magnetic material, and at least one coil is formed by winding a wide surface of a rectangular conductor perpendicular to a winding axis. And fixing another coil to be laminated by a spring-like repulsive force of the edgewise coil.
This is a small surface mount type coil component.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Deleted

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction contents]

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The coil component of the present invention can be a coil having no connection portion by soldering or the like by forming a coil for high current with one conductor. as a conductor, and the strip conductor and materials, and in the vertical direction the wide surface of the belt-shaped conductor relative to the winding axis, and edgewise coil formed by winding spirally, co
The il part can be made thin.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction contents]

The edgewise coil has a spring-like repulsive force in a spiral shape, and can apply a force from both ends to form a laminated structure in which adjacent spiral conductors are in close contact with each other .
Coil assembly as a close-adhesive laminate that suppresses spring-like repulsion in advance
To improve workability, or use edge-wise coil springs.
Print coil, planar winding built into laminate by repulsion
Workability that can fix coil backlash without bonding
It becomes a small coil component with improved. Furthermore, by forming the terminal on the high current side with the terminal of the edgewise coil, unnecessary contact resistance was removed to make the coil low in resistance, and the reduction in efficiency due to the coil could be reduced.

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0015

[Correction method] Change

[Correction contents]

Referring to the exploded view of FIG. 1, the method of assembling the coil component of the present invention will be described. The print coil 2 is set on the bobbin 3, and the pin terminals 9 of the bobbin 3 and the mounting holes 7 of the print coil 2 are soldered. Attached. Thereafter, the core 4 having a leg portion is assembled, the edgewise coil is inserted into the middle leg of the core 4, and then the core 5 is assembled. The edgewise coil 1 is sandwiched between the cores 4 and 5, so that the spiral conductor has a laminated structure close to close contact, and has a spring-like repulsive force.
The movement of the printed coil 2 was suppressed.

[Procedure amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction contents]

Each coil of the coil component requires an insulation treatment, and the edgewise coil has a conductor surface coated with a resin or a conductor is preliminarily adhered and laminated so that the entire coil is wrapped with a resin to suppress spring-like repulsion. There is also a way to do it. In the latter case, when a thick conductor is used as an edgewise coil, the spring structure has a large repulsion force, and this is the most effective method in consideration of workability in manufacturing coil components.

Claims (5)

[Claims] In a coil component using two or more coils, a bobbin, and a set of cores made of a magnetic material, at least one coil is formed by winding a wide surface of a rectangular conductor perpendicular to a winding axis. A surface-mounted small-sized coil component, characterized in that the edgewise coil and another planar coil are assembled into a core in a laminated manner. 2. A coil component using two or more coils, a bobbin and a set of cores made of a magnetic material, wherein at least one coil is formed by winding a wide surface of a rectangular conductor perpendicular to a winding axis. An edgewise coil comprising a pair of cores incorporating a spring-like repulsive force, the edgewise coil being suppressed by a set of cores. 3. The coil according to claim 1, wherein at least one of the coils comprises an edgewise coil, and the other coil comprises a printed coil or a flat wound coil comprising a round or square wire. Surface mount type small coil parts. 4. The device according to claim 1, wherein the edgewise coil is a choke coil for blocking AC, and the other coil is a transformer coil for supplying electric power to the driving element.
The surface mount type small coil component according to claim 3. 5. The edgewise coil is a high current side coil,
The surface-mounted small-sized coil component according to claim 1, wherein the other coil forms a transformer as a low-current side coil. 5.