JP2005340458A - Fixing tool for inductance component and power unit using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To sufficiently present functions of a power unit by surely radiating a core. <P>SOLUTION: The fixing tool of an inductance component is comprised of a top plate 101 covering the upper surface of an approximately parallelopiped core 201 forming the outer shape of an inductance component 200, two side plates 102 covering side surfaces of the core 201, two fixing terminals 103 of portions to be actually fixed on a mounting surface, and two pressers 104 formed in folding portions from the side plates to the top plate and pressing both terminals on the upper surface of the core 201, and these components are integrally formed by punching and bending one metal sheet having predetermined thickness. Each of the pressers 104 becomes an approximately L-shaped member having a supporting point in the side plate 102 and having a pressing point on the upper surface of the core. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fixing tool for an inductance component and a power supply unit using the same, and more particularly to a fixing tool capable of sufficiently exerting the performance of the power supply unit and a power supply unit using the fixing tool. is there.

  An inductance component is mounted on a power supply unit that supplies predetermined power to the electronic device. Inductance components usually consist of a coil, core, and bobbin, and the core generates heat when energized. However, the core is sufficiently cooled and the entire power supply unit is stabilized to fully demonstrate the performance of the power supply unit. It is desirable to operate at temperature. Therefore, it is necessary to place the inductance component on the heat sink and dissipate the heat generated in the core from the heat sink. However, if the core is not in close contact with the heat sink, heat is not transmitted to the heat sink and is not sufficiently dissipated, so that the function of the power supply unit is significantly deteriorated.

  Therefore, for example, a fixture for an inductance component as shown in FIG. 8 is known. The fixing device 800 for the inductance component includes a top plate portion 801 that covers the top surface of the core of the inductance component, a side plate portion 802 that covers both side surfaces of the core of the inductance component, and a fixed end provided with a round hole for screwing. 803. The fixing device 800 presses the upper surface of the core of the inductance component to press the core against the mounting surface, thereby improving the adhesion between the core and the heat sink forming the mounting surface, thereby improving the heat dissipation of the core. The inductance component fixture 800 is a so-called two-point pressing type that presses two points P1 and P2 on both ends of the upper surface of the core. In a one-point pressing type fixing tool that presses only the center part of the upper surface of the core, when used for a core having a center gap, the core may be broken when an impact such as dropping is applied. A two-point press type fixture is preferably used.

In addition, a fixture for an inductance component provided with a pressing piece is also known (see Patent Document 1). This fixture is configured to press the inductance component from above with a pressing piece formed by partially cutting the top plate portion.
JP 2002-369528 A

  By the way, it is desirable that the height dimension of the fixture is as small as possible in order to meet the demands for reducing the size and height of the power supply unit. Further, if the height dimension of the fixture is reduced, the development area is also reduced, so that low cost can be realized.

  However, in the conventional inductance component fixture 800 shown in FIG. 8, the smaller the fixture height dimension, the less play with respect to the core, and the side plate 802 of the fixture becomes more difficult to deform. There is a problem. For this reason, the rigidity, that is, the spring constant increases, the tolerance of the height dimension cannot be sufficiently absorbed, and the management of the pressing force becomes strict. On the other hand, if the height dimension of the fixture is increased, the tolerance of the height dimension can be absorbed. However, it is difficult to satisfy the demands for reducing the size and height of the power supply unit.

  Further, in the case of the conventional fixing device for an inductance component provided with the above-mentioned pressing piece, the problem as in the conventional fixing tool 800 shown in FIG. 8 is not so great, but the pressing piece is formed only on the top plate portion. Therefore, the tolerance of the core height dimension cannot be sufficiently absorbed, and in some cases, sufficient pressing force cannot be applied to the core, resulting in insufficient adhesion between the core and the heat sink. It was. Therefore, heat radiation from the core to the heat sink becomes insufficient, and there is a problem that the function of the power supply unit is deteriorated.

  Therefore, an object of the present invention is to provide a fixing tool for an inductance component that can reliably dissipate heat from a core and can fully exert the function of a power supply unit. Another object of the present invention is to provide a power supply unit that can operate stably regardless of the heat generated by the inductance component.

  The object of the present invention is a fixture for fixing an inductance component having a core on a mounting surface, the top plate portion covering the upper surface of the core, the side plate portion covering the side surface of the core, and the side plate. This is achieved by a fixing device for an inductance component, characterized by having a fulcrum at the part and a substantially L-shaped pressing piece having a pressing point on the upper surface of the core.

  According to the present invention, since the pressing piece spreads outward and absorbs the tolerance of the height dimension of the core, the core can be pressed against the mounting surface with an optimal pressing force. Therefore, the core can be surely dissipated and the function of the power supply unit can be fully exhibited.

  In a preferred embodiment of the present invention, the pressing piece further has a pressing point on the side surface of the core.

  According to a preferred embodiment of the present invention, the side surface of the core is pressed together with the upper surface of the core, so that the core is securely fixed in the lateral direction, and it is possible to reliably prevent loosening of the core due to vibration. it can.

  In preferable embodiment of this invention, it has the 1st press piece which presses one end of the said upper surface of the said core, and the 2nd press piece which presses the other end of the said upper surface of the said core.

  According to a preferred embodiment of the present invention, it is possible to provide a suitable fastener for an inductance component for a core having a center gap.

  The object of the present invention is also achieved by a power supply unit comprising at least an inductance component having a core and a fixture for the inductance component for fixing the inductance component.

  According to the present invention, it is possible to provide an inductance component that can reliably dissipate heat from the core and can sufficiently exert the function of the power supply unit. In addition, according to the present invention, it is possible to provide a power supply unit that can operate stably regardless of heat generation from the inductance component.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a schematic perspective view showing the shape of a fixing tool for an inductance component according to a preferred embodiment of the present invention. FIG. 2 is a schematic perspective view showing a state in which such a fixture is mounted on an inductance component.

  As shown in FIGS. 1 and 2, the inductance component fixture 100 includes a top plate portion 101 that covers the upper surface of a substantially rectangular parallelepiped core 201 that forms the outer shape of the inductance component 200, and two covers that cover the side surfaces of the core 201. The side plate portion 102, two fixed ends 103 that are actually fixed on the mounting surface, and two bent portions that are formed from the side plate portion to the top plate portion and press both end portions of the upper surface of the core 201 The pressing piece 104 is formed integrally by punching and bending a single metal plate having a predetermined thickness.

  The width of the top plate portion 101 is set to be equal to the width of the core 201 so that the substantially rectangular parallelepiped core 201 fits snugly. The side plate portion 102 is a flat plate portion that is formed by being bent at a right angle downward from both ends of the top plate portion 101. The two side plate portions 102 and the top plate portion 101 serve as a frame into which the core 201 is fitted.

  The fixed end 103 is a wing-like flat plate portion parallel to the mounting surface formed by bending the tip end portion of the side plate portion 102 to the outside at a right angle. A round hole 105 for fixing with screws is provided in the center of the flat plate portion forming the fixed end 103.

  A U-shaped cutout 106 is formed by punching at a bent portion from the side plate portion 102 to the top plate portion 101 of the fixture 100, and a pressing piece 104 is formed at the cut portion. The pressing piece 104 is a substantially L-shaped (claw-shaped) member having a fulcrum on the side plate portion 102 and a pressing point on the upper surface of the core. Note that the pressing piece 104 also serves to cover the upper surface portion and the side surface portion of the core 201.

  When the inductance component 200 is fixed using the fixing device 100 configured as described above, the fixing device 100 is put over the inductance component 200 temporarily fixed at a predetermined mounting position, and then the fixed end 103. Is fixed by a screw 107. Thereby, the inductance component 200 is securely fixed at a predetermined mounting position. At this time, the core 201 is pressed downward by the pressing piece 104 and the bottom surface of the core 201 and the heat sink forming the mounting surface are in close contact with each other, so that the heat dissipation effect of the core 201 can be enhanced. Also, if the height dimension of the core 201 is larger than the design value, the pressing piece 104 spreads outward in the direction indicated by the arrow X in FIG. 1 and absorbs the tolerance of the height dimension of the core 201. The adjustment becomes easier.

  FIG. 3 is a schematic perspective view showing the external configuration of the power supply unit.

  As shown in FIG. 3, the power supply unit 300 includes an inductance component 200 mounted on a base plate 301 having a function as a heat sink, and each inductance component 200 is fixed by the fixing tool 100 described above. A printed circuit board 302 on which various electronic components are mounted is mounted on the base plate 301, and the wiring of the inductance component 200 is connected to a circuit on the printed circuit board 302. Thus, if the inductance component 200 is fixed on the base plate 301 using the fixing tool 100 according to the present embodiment, the inductance component 200 can be reliably fixed at a predetermined mounting position on the base plate 301. Furthermore, since the core 201 of the inductance component 200 is pressed downward by the pressing piece 104 and the bottom surface of the core 201 and the base plate 301 are in close contact with each other, the heat dissipation effect of the core 201 can be enhanced. Therefore, the performance of the power supply unit 300 can be exhibited sufficiently.

  In the above-described embodiment, the fixing device for an inductance component in which one pressing piece is formed on each of the left and right sides has been described. However, a plurality of pressing pieces may be provided on one side.

  FIG. 4 is a schematic perspective view showing the shape of an inductance component fixture according to another preferred embodiment of the present invention.

  As shown in FIG. 4, the inductance component fixture 400 is different from the inductance component fixture 100 shown in FIG. 1 in that two pressing pieces 104 are provided on the left and right sides. Other basic configurations are the same as those of the fixture 100 of FIG. According to the present embodiment, like the fixture 100 of FIG. 1, the pressing piece spreads outward to absorb the tolerance of the height dimension of the core, so that the core can be pressed against the mounting surface with an optimal pressing force. . Therefore, the core can be surely dissipated and the function of the power supply unit can be fully exhibited. Further, since the four points on the upper surface of the core are pressed, a uniform pressing force can be applied to the upper surface of the core having a particularly large mounting area.

  FIG. 5 is a schematic perspective view showing the shape of a fixing tool for an inductance component according to still another preferred embodiment of the present invention.

  As shown in FIG. 5, the inductance component fixture 500 includes only one pressing piece 104 on one side, and a fixed end 103 is provided only on one side of the fixture 500, and only one side is provided. It is different from the inductance component fixture 100 shown in FIG. Other basic configurations are the same as those of the fixture 100 of FIG.

  That is, the inductance component fixture 500 according to the present embodiment includes a top plate portion 101 that covers the top surface of the core, a first side plate portion 501 that covers one side surface of the core, and a first plate that covers a part of the other side surface. 2 side plate portions 502, a fixed end 103 which is a portion actually fixed on the mounting surface, and a pressing piece 104 which is formed at a bent portion from the side plate portion to the top plate portion and presses both end portions of the upper surface of the core. Consists of. The length of the second side plate portion is shorter than that of the first side plate portion, and the fixed end 103 is not provided at the tip thereof, but the first side plate portion 501, the second side plate portion 502, and the top plate portion 101 , Play a role as a frame into which the core is fitted. The inductance component fixing device 500 according to the present embodiment can be preferably used for relatively small inductance components, and in that case, even if it is screwed only on one side, it can be sufficiently fixed. A sufficient pressing force can be secured.

  FIG. 6 is a schematic cross-sectional view showing the shape of a fixing tool for an inductance component according to still another preferred embodiment of the present invention.

  As shown in FIG. 6, in the fixing device 600 for inductance components, a substantially L-shaped pressing piece 104 is bent inward from the fulcrum by an angle θ, whereby not only the top surface of the core but also the side surface of the core. Further, the point having a pressing point is different from the fixing device 100 of the inductance component shown in FIG. The pressing point at this time is the upper end of the side surface of the core. Other basic configurations are the same as those of the fixture 100 of FIG.

  According to the present embodiment, since the side surface of the core is pressed together with the upper surface of the core, the lateral fixing of the core is also ensured, and the loose mounting of the core caused by vibration can be reliably prevented.

  FIG. 7 is a schematic cross-sectional view showing the shape of an inductance component fixture according to still another preferred embodiment of the present invention.

  As shown in FIG. 7, the inductance component fixture 700 has a substantially L-shaped pressing piece 104 in which a portion in contact with the side surface of the core is bent inwardly into a substantially V-shape. 1 has a pressing point P3 not only on the upper surface but also on the side surface of the core, which is different from the inductance component fixture 100 having the pressing point only on the upper surface of the core shown in FIG. Note that the pressing point P3 at this time is substantially the center of the side surface of the core. Other basic configurations are the same as those of the fixture 100 of FIG.

  According to the present embodiment, the side surface of the core is pressed together with the upper surface of the core as in the case of the inductance component fixture 600 of FIG. 6, so that the core is securely fixed in the lateral direction and the core is attached due to vibration. Can be reliably prevented.

  The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the invention described in the claims, and these are also included in the scope of the present invention. Needless to say.

  For example, in the above-described embodiment, the case where the fixing tool for the inductance component is fixed on the heat sink has been described. However, the present invention is not limited to such use. That is, the fixing device for the inductance component according to the present invention is particularly suitable for fixing the inductance component on the heat sink, but may be used for fixing the inductance component on the insulating substrate, for example.

FIG. 1 is a schematic perspective view showing the shape of a fixing tool for an inductance component according to a preferred embodiment of the present invention. FIG. 2 is a schematic perspective view showing a state where the fixture is attached to the inductance component. FIG. 3 is a schematic perspective view showing the external configuration of the power supply unit. FIG. 4 is a schematic perspective view showing the shape of an inductance component fixture according to another preferred embodiment of the present invention. FIG. 5 is a schematic perspective view showing the shape of a fixing tool for an inductance component according to still another preferred embodiment of the present invention. FIG. 6 is a schematic cross-sectional view showing the shape of a fixing tool for an inductance component according to still another preferred embodiment of the present invention. FIG. 7 is a schematic cross-sectional view showing the shape of an inductance component fixture according to still another preferred embodiment of the present invention. FIG. 8 is a schematic perspective view showing the shape of a conventional fixing tool for an inductance component.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Inductance component fixture 101 Top plate part 102 Side plate part 103 Fixed end 104 Pressing piece 105 Screw hole 106 Notch 200 Inductance component 201 Core 300 Power supply unit 301 Base plate 302 Printed circuit board 400 Inductance component fixture 500 Inductance component Fixing device 501 First side plate portion 502 Second side plate portion 600 Inductance component fixing device 700 Inductance component fixing device 800 Inductance component fixing device 801 Top plate portion 802 Side plate portion 803 Fixed end

Claims (4)

A fixing tool for fixing an inductance component having a core on a mounting surface,
A top plate covering the upper surface of the core;
A side plate covering a side surface of the core;
A substantially L-shaped pressing piece having a fulcrum on the side plate portion and a pressing point on the upper surface of the core;
A fixture for an inductance component, comprising:   The said pressing piece further has a pressing point in the said side surface of the said core, The fixing tool of the inductance components of Claim 1 characterized by the above-mentioned.   The inductance according to claim 1, further comprising: a first pressing piece that presses one end of the upper surface of the core; and a second pressing piece that presses the other end of the upper surface of the core. Parts fixture. A power supply unit comprising at least an inductance component having a core and an inductance component fixing device according to any one of claims 1 to 3 for fixing the inductance component.

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