JP2004047769A - Inductance element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To establish insulation between windings appropriately, to improve on a space factor, and to enable of a heavy current to flow. <P>SOLUTION: The inductance element comprises a belt-shaped coil 1 having belt-shaped sections 12A, 12B extending in opposite directions from the middle section 11 of the belt-shaped coil 1,a bobbin 2 around which the belt-shaped coil 1 is wound,two E-shaped cores 3A, 3B having shanks 31A, 31B inserted into the through-hole of the bobbin 2, and a protruding rail 23 formed in the outer circumference of the bobbin 2 for insulation between the two belt-shaped sections 12A, 12B. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an inductance element suitable for use in a power supply unit of a computer, and more particularly to an inductance element capable of flowing a large current at a high frequency.
[0002]
[Prior art]
FIG. 6 shows a circuit example of a multi-phase (three-phase) DC / DC converter. 101 is a control IC, VB is a power supply source, 102-1 to 102-3 are switching circuits, 103 is a load such as a CPU, and 106-1 to 106-3 are capacitors.
[0003]
Since the switching circuits 102-1 to 102-3 have the same configuration, the switching circuit 102-1 will be described. The switching circuit 102-1 includes switching elements 105-1a and 105-1b connected to a driving output terminal of the control IC 101, and an inductance element 104-1.
[0004]
In the above configuration, a load current ranging from several amps to several tens of amps flows through the load 103, and at the same time, a large current also flows through the inductance elements 104-1 to 104-3.
[0005]
By the way, in the related art, the operation (switching) frequency of the control IC 101 and the switching elements 105-1a to 105-3a and 105-1b to 105-3b used in the above circuit is not so high. As the inductance elements 104-1 to 104-3 used for 1 to 102-3, those having an inductance value of about several tens of μH (microhenry) have been used. As the structure of the inductance elements 104-1 to 104-3, for example, a wire having a large diameter is wound around a drum-shaped ferrite core having a large core diameter a predetermined number of times.
[0006]
In recent years, with the advance of technology, the operating frequencies of the control IC 101 and the switching elements 105-1a to 105-3a and 105-1b to 105-3b have been dramatically increased. As an inductance element used in a DC converter circuit, an inductance element having an inductance value of 1 μH or less has come to be required.
[0007]
In addition, the performance of the CPU 103 has been improved along with the control IC 101 and the switching elements 105-1 a to 105-3 a and 105-1 b to 105-3 b, and the CPU 103 has been viewed as a load of the DC / DC converter circuit. In this case, the load current becomes very large.
[0008]
[Problems to be solved by the invention]
In the configuration of the conventional inductance element as described above, since the winding is a round wire, a gap is generated between the wound round wires, and the space factor is reduced. Further, there is a problem that the DCR (direct current resistance) is large due to a low space factor and the temperature rise is large.
[0009]
The present invention has been made in order to solve the problems of the conventional inductance element as described above, and its object is to improve the space factor and to allow a large current to flow, thereby improving the space factor. It is an object of the present invention to provide an inductance element that can appropriately secure insulation between windings or between a winding and a core even in the case of the above.
[0010]
[Means for Solving the Problems]
An inductance element according to the present invention includes a band-shaped coil including two band-shaped portions extending in opposite directions from a center portion, a bobbin for winding the band-shaped coil, and a shaft inserted into a through hole of the bobbin. And two E-shaped cores, and a ridge that insulates between the two strips in a wound state is formed on an outer peripheral portion of the bobbin.
[0011]
The inductance element according to the present invention is characterized in that a ridge for insulating the strip-shaped coil and the E-shaped core is formed on an outer peripheral portion of the bobbin.
[0012]
The inductance element according to the present invention is characterized in that the tip of the two strips is an electrode.
[0013]
The inductance element according to the present invention is characterized in that a positioning portion including an uneven portion is formed at a base of the strip-shaped coil and a portion of the bobbin around which the base is wound.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of an inductance element according to the present invention will be described with reference to the accompanying drawings. In each drawing, the same components are denoted by the same reference numerals, and redundant description will be omitted. The inductance element according to the present embodiment is configured as shown in an exploded perspective view in FIG. That is, the bobbin 2 includes the bobbin 2 around which the band-shaped coil 1 is wound, and the two E-shaped cores 3A and 3B having the shaft portions 31A and 31B inserted into the through holes 21 of the bobbin 2.
[0015]
Before being wound around the bobbin 2, the strip-shaped coil 1 is as shown in FIG. There are provided two strips 12A and 12B extending in mutually opposite directions from the central part 11, and holes 13 are formed in the central part 11 as recesses at two places.
[0016]
The bobbin 2 has a configuration in which a flat base 22 is formed on a substantially cylindrical main body 20. In the band-shaped coil 1, the band-shaped portions 12 </ b> A and 12 </ b> B are bent into the shape shown in FIG. 2 and wound around the bobbin 2.
[0017]
In the outer peripheral portion of the bobbin 2, a groove is formed in a portion where the band-shaped portions 12A and 12B having the shape shown in FIG. 2 are positioned, and an insulation is provided between the wound two band-shaped portions 12A and 12B. A protruding ridge 23 is formed. Protrusions 24A, 24B that insulate between the cores 3A, 3B and the strip-shaped coil 1 are formed on the outer peripheral portions of both ends of the bobbin 2.
[0018]
A hole is formed in the base 22 of the bobbin 2 so that the strips 12A and 12B have a shape as shown in FIG. 2, and the front ends of the two strips 12A and 12B pass through and the bottom of the base 22 is formed. 4, holes for exposing to the outside are formed, and the tips of the strips 12A and 12B are electrodes 28A and 28B. Also, projections 25, 25 which are convex portions are formed on the bottom surface of the base 22 corresponding to the two holes 13, 13 formed in the central portion 11 of the strip-shaped coil 1, and the holes 13, The projections 25, 25 enter the positioning portion 13 to perform positioning. The concave portion and the convex portion in the above may be formed on the base 22 so as to be positionable at a position corresponding to the central portion 11, and the concave portion and the convex portion are provided on one side and the convex portion on the other side. It does not matter.
[0019]
When the shaft portions 31A and 31B are inserted into the through holes 21 of the bobbin 2, the E-shaped core 3A and the E-shaped core 3B have a housing shape as shown in FIG. A window 4 results. The periphery of the shaft portion 31A (31B) of the E-shaped core 3A (3B) is cut so as to surround the shaft portion 31A (31B), and a bobbin around which the band-shaped coil 1 is wound is formed in the space created by the cutting. 2 are stored.
[0020]
In the inductance element configured as described above, the bobbin 2 has a configuration in which the holes 13 and 13 formed in the band-shaped coil 1 and the positioning portion formed by the protrusions 25 and 25 formed on the bottom surface of the base 22. On the other hand, the band-shaped coil 1 can be appropriately wound, thereby facilitating the production. Further, the coil used is the band-shaped coil 1, which can improve the space factor, reduce the value of DCR (DC resistance), and generate less heat even when a large current flows. It was confirmed that, even when an inductance element according to the present invention having an inductance value of, for example, 300 nH was manufactured, a rated current value of 20 A and a DCR of 1.1 mΩ can be obtained. In addition, since the two strips 12A and 12B are insulated by the ridges 23 and the strips 12A and 12B and the cores 3A and 3B are insulated by the ridges 24A and 24B, the flatness of the strip coil 1 ( Even when the aspect ratio is increased, insulation can be ensured.
[0021]
【The invention's effect】
As described above, according to the inductance element of the present invention, the outer peripheral portion of the bobbin is formed with the projecting ridge that insulates between the two strips in the wound state or between the strip and the core. Therefore, appropriate insulation can be ensured.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing an embodiment of an inductance element according to the present invention.
FIG. 2 is a perspective view showing a shape of a strip-shaped coil of the embodiment of the inductance element according to the present invention.
FIG. 3 is a perspective view of an inductance element according to an embodiment of the present invention in an assembled state.
FIG. 4 is a bottom view of an embodiment of the inductance element according to the present invention.
FIG. 5 is a plan view showing a shape of a strip-shaped coil of the embodiment of the inductance element according to the present invention.
FIG. 6 is a diagram showing a circuit example of a multi-phase (three-phase) type DC / DC converter to which the inductance element according to the present invention is applied;
[Explanation of symbols]
Reference Signs List 1 strip coil 2 bobbin 3A, 3B E-shaped core 4 window 11 center part 12A, 12B strip part 13 hole 20 main body part 21 through hole 22 base 23, 24A, 24B ridge 25 protrusion 28A, 28B electrode 31A, 31B shaft part

Claims (4)

A band-shaped coil including two band-shaped portions extending in opposite directions from a central portion;
A bobbin for winding the band-shaped coil;
Comprising two E-shaped cores having a shaft inserted into the through hole of the bobbin,
An inductance element, wherein a projection that insulates between the two strips in a wound state is formed on an outer peripheral portion of the bobbin. 2. The inductance element according to claim 1, wherein a ridge for insulating the band-shaped coil and the E-shaped core is formed on an outer peripheral portion of the bobbin. 3. 2. The inductance element according to claim 1, wherein tips of the two strips are electrodes. 3. An inductance element, characterized in that a positioning portion composed of an uneven portion is formed at a base of the strip-shaped coil and a portion of the bobbin around which the base is wound.

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