JP2010093016A - Thin coil and power supply using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the following problems: a cooling structure of a conventional transformer is affected by a thickness or the like of a winding part; and it is difficult to obtain cooling effect between both sides of a circuit board after the transformer is mounted on the circuit board. <P>SOLUTION: A thin coil 11 includes at least a winding 17 wound around a bobbin 12, and a U core 15 fixed on the bobbin 12. A ventilating hole 14 is provided on a part facing a magnetic leg 23 of the bobbin 12 to air-cool the U core 15 and winding 17 simultaneously. Furthermore, even after the thin coil is mounted on the circuit board 19, the air-cooling effect can be improved between both sides of the circuit board 19 by the ventilating hole 14. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention uses a thin coil used for a thin display (for example, a wall-mounted liquid crystal television, plasma television, EL television or the like) or a power circuit of various electric products including an IH cooker, and the like. It is about power supply.

  Thin TVs are required to be thinner and consume less power. Therefore, there is an urgent need to reduce the thickness and power consumption of power supplies (including power supply modules and power supply units) used in these electrical products. For this reason, in transformers and choke coils used for power supplies (thin coils of the present invention include transformers and choke coils), by reducing the height (or reducing the thickness) and increasing the heat dissipation (higher heat dissipation), Resistance is reduced, and low power consumption of the device can be realized). For such a problem, efficient cooling of the coil components is required.

  FIG. 10 is a perspective view showing an example of a bobbin with a vent hole used in a conventional winding coil. In FIG. 10, 1, 2 and 1 ′, 2 ′ are winding bobbin flanges, 3 and 3 ′ are winding bobbin collars, a is a window that opens to the lower side of A, and A is in (A). (B) is inserted in the direction, a and a ′ are overlapping windows of openings and notches, b and b ′ are overlapping windows at the bottom, c and c ′ are overlapping windows, and d and d ′ are overlapping windows at the top. . Then, by combining the parts (a) and (b) of FIG. 10, a kind of ventilation hole composed of a-a ′ and c-c ′ is formed.

And the coil | winding (not shown) wound around the bobbin is cooled by using such a bobbin with a ventilation hole (refer patent document 1).
Japanese Utility Model Publication No. 62-91718

  However, the conventional coil component proposed in FIG. 10 has a limitation in heat dissipation from the core portion even though heat dissipation from the winding portion is possible. Also, it has been difficult to cope with the thin mounting of the coil component itself. There was also a limit to air cooling after mounting.

  The present invention intends to effectively cool both the core and the winding even when the thin coil is mounted on a circuit board or the like.

  In order to solve the above-mentioned problems, the present invention is a thin coil having at least a winding wound around a bobbin and a U core having a magnetic leg fixed to the bobbin, and faces the magnetic leg of the bobbin. This is a thin coil provided with ventilation holes on the side to be operated.

  As described above, according to the present invention, both the bobbin and the core are cooled at the same time by providing the ventilation hole in the portion facing the magnetic leg between the winding wound around the bobbin and the core. Furthermore, by using a U-shaped core as the core, the coil itself can be made thin.

  Note that the drawings shown in the embodiments of the present invention are schematic views and do not show the positional relationship correctly in terms of dimensions.

(Embodiment 1)
The first embodiment of the present invention will be specifically described below with reference to FIGS.

  1 is a perspective view of a thin coil according to Embodiment 1. FIG. In FIG. 1, 11 is a thin coil, 12 is a bobbin, 13 is a reinforcing part, 14 is a vent hole, 15 is a U core, and 16 is a terminal.

  The terminal 16 is a metal pin bent into, for example, an L-shape, and a winding (not shown) provided on the thin coil 11 is fixed to one end thereof, and the thin coil 11 is connected to a predetermined end with a predetermined end. Connect to circuit board (not shown).

  In FIG. 1, the reinforcing portion 13 formed on the upper surface of the bobbin 12 is provided to increase the strength of the structure of the resin bobbin 12 even when the thin coil 11 is thinned. 13 can secure the structural reinforcing effect of the ventilation hole 14 and a predetermined creepage distance and insulation distance.

  The ventilation hole 14 in FIG. 1 is formed in a portion of the bobbin 12 wound with a winding (not shown) facing the magnetic leg of the U core 15 (the magnetic leg is not shown in FIG. 1). . Thus, the thin coil 11 can be efficiently cooled by forming a plurality of ventilation holes 14 penetrating the thin coil 11 in the thickness direction in the portion of the bobbin 12 facing the magnetic legs.

  In the first embodiment, the core is not a general E-shaped core, but a U-shaped core is a U-core 15 to further reduce the height of the transformer and choke coil. This is to realize.

  FIG. 2 is a top view of the thin coil 11 shown in FIG. In FIG. 2, 17 is a winding. As the winding wire 17, a copper wire for coil (including an insulation reinforced copper wire, a three-layer covered wire, etc.) is used. Note that the end of the winding 17 is connected to a terminal 16 fixed to the bobbin 12 with solder or the like.

  As shown in FIG. 2, the ventilation hole 14 is formed between the U core 15 and the bobbin 12 (or the winding 17), and the magnetic leg (the magnetic leg is described later with reference to FIG. A) The U core 15 is cooled via (described in (B)). Note that the ventilation hole 14 improves ventilation by penetrating the thin coil 11 in the vertical direction.

  FIG. 3 is an example of a perspective view of the thin coil 11, and particularly illustrates an air cooling mechanism in the ventilation hole 14. In FIG. 3, reference numeral 18 denotes an arrow, which indicates, for example, the flow of air that passes through the thin coil 11. As shown in FIG. 3, the ventilation hole 14 penetrates the thin coil 11 in the thickness direction, which is to facilitate the flow of air flowing through the ventilation hole 14. Further, by providing the reinforcing portion 13 above and below the ventilation hole 14 so as to constitute the wall surface of the ventilation hole 14, the chimney effect (particularly when the thin coil 11 is fixed on a horizontal surface) and the area of the inner wall of the ventilation hole 14 are increased. Increase the heat dissipation effect.

  As described above, the thin coil 11 has at least the winding 17 wound around the bobbin 12 and the U core 15 having the magnetic leg fixed to the bobbin 12, and faces the magnetic leg of the bobbin 12. By forming the thin coil 11 having the ventilation holes 14 in the portion to be made, the thin coil 11 having excellent air cooling property is realized.

  Further, by exposing a part of the winding wire 17 to the magnetic leg side through the ventilation hole 14, the heat dissipation of the winding wire 17 portion in the thin coil 11 can be enhanced.

(Embodiment 2)
In the second embodiment, when the thin coil 11 described in the first embodiment is mounted on a circuit board and used as a power source (in the second embodiment, a power source is a power module, a power circuit, a power source). A description will be given of how to improve the heat dissipation effect of what is called a block or a part thereof.

  4A and 4B are cross-sectional views for explaining how the thin coil 11 is mounted on the circuit board, and FIG. 4C is a cross-sectional view for explaining the air cooling effect of the thin coil 11 mounted on the circuit board.

  4A to 4C, 19 is a circuit board, 20 is a hole, and 21 is a power source. The hole 20 is for inserting a part of the thin coil 11 (for example, the U core 15) and the like. By inserting a part of the thin coil 11 into the hole 20, the power source 21 can be thinned (or mounted with a low profile). ).

  As shown by the arrow 18 in FIG. 4C, the thin coil 11 is set in the hole 20 provided in the circuit board 19 to obtain the power source 21 in FIG.

  An arrow 18 in FIG. 4C indicates the air flow in the power source 21. As indicated by an arrow 18, the air that has entered between the circuit board 19 and the thin coil 11 (or the hole 20) flows through the ventilation hole 14 formed by the reinforcing portion 13 and the like to efficiently pass the thin coil 11 from the inside. Cool down.

  FIG. 5 is a perspective view illustrating an example of the ventilation hole 14. As shown in FIG. 5, the winding 17 is directly air-cooled by exposing a part of the winding 17 to the ventilation hole 14 reinforced by the reinforcing portion 13.

  FIG. 6 is a perspective view for explaining the flow of air flowing through the ventilation holes 14 via the circuit board 19. In FIG. 6, a dotted line 22 omits a part of the circuit board 19. As shown in FIG. 6, air flows as shown by the arrow 18 through the hole 20 provided in the circuit board 19 to insert a part of the thin coil 11, and the thin coil 11 is efficiently cooled from the inside. To do.

  FIG. 7A is a cross-sectional view of the bobbin 12 having the ventilation holes 14, and FIG. 7B is a cross-sectional view illustrating a state after the winding 17 is wound around the bobbin 12. 7A and 7B, a part of the ventilation hole 14 is reinforced by the reinforcing portion 13. For this reason, the coil | winding 17 is wound on the ventilation hole 14 as shown in FIG.7 (B). In addition, the winding part of the coil | winding 17 is shown in the simplified state.

  FIG. 8A is a cross-sectional view illustrating a state in which a plurality of bobbins 12 wound with windings 17 are arranged, and FIG. 8B is a cross-sectional view of the U core 15 having magnetic legs. Reference numeral 23 in FIG. 8B denotes a magnetic leg, which is provided on a part of the U core 15.

  A plurality of bobbins 12 are arranged as shown in FIG. The hole 20 formed in the bobbin 12 is for inserting the magnetic leg 23 of the U core 15 shown in FIG.

  9A is a cross-sectional view for explaining a state in which a plurality of bobbins 12 wound with windings 17 are fixed to each other with the U core 15, and FIG. 9B is a part facing the magnetic leg 23 of the U core 15. It is sectional drawing explaining a mode that air distribute | circulates through the provided ventilation hole. As shown in FIG. 9B, air flows through the ventilation hole 14 provided on the side facing the magnetic leg 23 of the bobbin 12 as shown by the arrow 18, so that the thin coil 11 is moved from the inside. Dissipates heat efficiently. This is because the inside of the U core 15 and the winding 17 of the thin coil 11 is particularly likely to generate heat.

  7 to 9, the terminal 16 provided on the bobbin 12 and the connection between the terminal 16 and the winding 17 are not shown.

  As described above, at least the thin coil 11 having the winding 17 wound around the bobbin 12 and the U core 15 having the magnetic leg 23 fixed to the bobbin 12 and a part of the thin coil 11 are inserted. A power supply 21 having a circuit board 19 having a hole 20, wherein the power supply 21 is provided with the ventilation hole 14 in a portion facing the magnetic leg 23 of the bobbin 12. The effect can be enhanced and the thickness can be reduced.

  It goes without saying that the thickness of the thin transformer 11 can be further reduced by devising the thickness and shape of the U core 15. Further, even when the thickness of the thin transformer 11 is extremely thin such as several mm, the side surface of the magnetic leg 23 of the U core 15 is used as the side surface of the ventilation hole 14 (or directly exposed to the ventilation hole 14). Thus, the heat dissipation effect can be further enhanced.

  Note that various standard values for transformers and the like are, for example, JEM 1333 (JEM indicates the Japan Electrical Manufacturers Association standard), JEC2200 (JEC indicates the Japanese Standards Committee Standard), JWDS0013 (JWDS indicates the Japan Wiring Equipment Manufacturers Association). Etc. can be referred to. When the thin coil 11 is a transformer, the insulation type (for example, insulation types of A, E, B, F, and H), the temperature rise limit, and the like may correspond to the application.

  As described above, the thin coil of the present invention and the power source using the coil can reduce the thickness of various electric products such as a thin TV and an electromagnetic cooker.

The perspective view of the thin coil in Embodiment 1 Top view of thin coil shown in FIG. Thin coil perspective view (A) (B) is sectional drawing explaining a mode that a thin coil is mounted in a circuit board, (C) is sectional drawing explaining the air-cooling effect of the thin coil mounted in the circuit board. A perspective view explaining an example of a vent hole The perspective view explaining the flow of the air which flows through a vent hole through a circuit board (A) is sectional drawing of the bobbin which has a ventilation hole, (B) is sectional drawing explaining the state after winding a winding around a bobbin (A) is a cross-sectional view illustrating a state in which a plurality of bobbins wound with windings are arranged, and (B) is a cross-sectional view of a U core having magnetic legs. (A) is sectional drawing explaining a mode that several bobbins which wound the winding are fixed with U core, (B) is through the ventilation hole provided in the part facing the magnetic leg of U core. Sectional view explaining how air flows The perspective view which shows an example of the bobbin with a vent hole used for the conventional winding coil

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Thin coil 12 Bobbin 13 Reinforcement part 14 Ventilation hole 15 U core 16 Terminal 17 Winding 18 Arrow 19 Circuit board 20 Hole 21 Power supply 22 Dotted line 23 Magnetic leg

Claims (3)

A thin coil having at least a winding wound around a bobbin and a U-core having a magnetic leg fixed to the bobbin;
The thin coil which provided the ventilation hole in the part which faces the said magnetic leg of the said bobbin. The thin coil according to claim 1, wherein a part of the winding is exposed to the magnetic leg side through the ventilation hole. A thin coil having at least a winding wound around a bobbin and a U-core having a magnetic leg fixed to the bobbin;
A circuit board having a hole for inserting a part of the thin coil;
A power supply having
The power supply which provided the ventilation hole in the part which faces the said magnetic leg of the said bobbin.

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