JP2017130604A - Surface-mount inductor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a surface-mount inductor having a combination of a plurality of cores, enabling mounting in either an upward direction or a downward direction, which is not obtainable ever before, though a chip inductor can be mounted in both upward and downward directions if a slight electric characteristic difference due to an internal structure is ignored.SOLUTION: A surface-mount inductor 10 houses a winding inside cores 21, 22, each having a salient at the center of a bottom part having an outer periphery surround with a wall. The terminals 31, 32 of the winding are connected to a pair of metal terminals 41, 42, respectively. A pair of cores 21, 22 has an identical shape, and the winding is two-layered alpha winding having both terminals extracted from the outer periphery of the winding. The pair of metal terminals 41, 42 has a U-shape, so that the surface-mount inductor 10 can be mounted in either upward or downward direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a surface mount inductor.

  A closed magnetic circuit structure inductor in which a coil is housed inside a pair of E-shaped pot-shaped cores arranged facing each other and a pair of metal terminals are arranged on the exterior for a choke coil such as a DC / DC converter Is used.

JP 2013-183052 A Japanese Patent Laid-Open No. 2005-142459

  Cited Document 1 discloses a chip inductor in which windings wound so that both winding terminals are pulled out from the outer periphery are molded with a magnetic powder-containing resin, and electrodes are provided on the five adjacent surfaces adjacent to the end surfaces. Is described. Such an inductor can be mounted both above and below, ignoring slight differences in electrical characteristics due to the internal structure.

Patent Document 2 describes a surface mount inductor in which a plurality of cores are combined. Such inductors are asymmetrical in shape or marked with a seal or the like in order to show polarity due to the difference in internal structure.
However, in the surface mount inductor described in Patent Document 2, there is no inductor that can be mounted in either the vertical direction, unlike the chip inductor described in Patent Document 1.

In the surface mount inductor according to the present invention, the winding is housed in a core having a convex portion at the center of the bottom surrounded by the wall on the outer periphery of the bottom, and the ends of the winding are connected to a pair of metal terminals, respectively. In the surface mount inductor, the pair of cores have the same shape, the winding is a two-layer α winding with both ends drawn from the outer periphery of the winding, and the pair of metal terminals Is a letter shape,
It can be mounted in any direction.

  According to the present invention, it is possible to provide an inductor having a shape that can be mounted either vertically.

It is a perspective view which shows one Example of the surface mount inductor of this invention. It is a disassembled perspective view which shows one Example of the surface mount inductor of this invention. It is sectional drawing of FIG.

  Hereinafter, an embodiment of a surface mount inductor according to the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view showing an embodiment of a surface mount inductor according to the present embodiment, in which FIG. 1 (a) is an upper perspective view and FIG. 1 (b) is a lower perspective view. FIG. 2 is an exploded perspective view of the surface mount inductor shown in FIG. FIG. 3 is a cross-sectional view taken along the line AA in FIG.

  As shown in FIGS. 1 to 3, the surface-mount inductor 10 is bonded to a pair of cores 21 and 22, a winding 30 wound so that a terminal is pulled out from the outer periphery, and an exterior of the cores 21 and 22. Thus, the end of the winding 30 is composed of metal terminals 41 and 42 to which 31 and 32 are connected.

  The winding 30 is made of a rectangular wire having a rectangular cross section insulated with polyurethane or the like, wound around two stages of α windings (outer and outer windings), and the terminals 31 and 32 are drawn out from the outer periphery of the windings.

The core 21 is a so-called pot type made of ferrite, and includes a bottom portion 21d, a wall portion 21b provided on the outer periphery of the bottom portion, and a convex portion 21a provided in the center of the bottom portion. The core 22 has the same shape as the core 21, and includes a wall portion 22 b provided on the outer periphery of the bottom portion 22 d and a convex portion 22 a provided at the center of the bottom portion.
The walls 21b and 22b are provided with notches 21c and 22c, respectively.

  The core 21 and the core 22 are disposed so as to face each other so that the winding 40 is accommodated therein and the terminals 31 and 32 are pulled out to the outside of the core through the notches 21c and 22c.

  When the core 21 and the core 22 are disposed, a gap G for improving the DC superimposition characteristics is provided between the convex portions 21a and 22a. Since the cores 21 and 22 have the same shape, the difference between the height of the wall portion and the height of the convex portion is half of the gap G.

  The metal terminals 41 and 42 have a symmetric shape, and are formed by bending a metal plate into a U-shape.

  The metal terminals 41, 42 are arranged on the side surface of the surface-mount inductor 10 so that the bent end portions of the metal terminals 41, 42 hold the core 21 and the core 22.

  The terminals 31 and 32 are electrically connected to the metal terminals 41 and 42 by soldering or welding.

  In the surface mount inductor described above, the bent end portions of the metal terminals 41 and 42 extend to the upper surface 10a and the lower surface 10b of the surface mount inductor, and both end portions of the upper and lower surfaces function as mounting portions. Therefore, it can be seen that the surface-mount inductor 10 can be mounted either top or bottom.

It is desirable that the surface-mount inductor described above be vertically symmetrical as much as possible so as to minimize the difference due to the structure, regardless of whether it is mounted vertically. For example, it is desirable that the core 21 and the core 22 have the same shape, the winding has two stages of α winding, and the metal terminals 41 and 42 have shapes that are symmetrical in the end direction.
By using a symmetrical shape, the types of cores can be reduced, and the member cost can be reduced.
Further, if the winding is made of two stages of α windings, the terminals 31 and 32 are pulled out from different positions, so that the cores 21 and 22 need only be provided with cutouts at only one place. By setting it as such a shape, a terminal can be easily pulled out of the core with a simple-shaped core.
In the above-described embodiment, the gap is provided between the convex portions, but may be provided between the wall portions.

DESCRIPTION OF SYMBOLS 10 Surface mount inductor 10a Upper surface 10b Lower surface 21, 22 Core 21a, 22a Convex part 21b, 22b Wall part 21c, 22c Notch 21d, 22d Bottom part 30 Winding 31, 32 Terminal 41, 42 Metal terminal

Claims (3)

A surface-mount inductor that houses a winding in a core having a convex portion at the center of the bottom surrounded by a wall on the outer periphery of the bottom, and connects the ends of the winding to a pair of metal terminals, respectively.
The pair of cores have the same shape,
The winding is a two-layer α winding with both ends drawn from the outer periphery of the winding,
The pair of metal terminals are U-shaped,
A surface-mount inductor that can be mounted in any direction. There is a gap of a predetermined dimension between the convex parts,
The surface-mount inductor according to claim 1, wherein a difference in height between the convex portion and the wall portion is one half of the predetermined dimension. The surface mount inductor according to claim 1, wherein the wall portion is provided with a notch for pulling out an end of the winding to the outside of the core.

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