JP6432167B2 - Winding parts and power supply - Google Patents

Description

  The present invention relates to a winding component and a power supply device using the winding component.

  As a switching power supply device such as an in-vehicle DC-DC converter, a parallel plate portion of a metal member facing a non-mounting surface of the substrate at a predetermined interval, and a choke coil protruding to the mounting surface side from a hole provided in the substrate 2. Description of the Related Art A power supply device using a winding component including an electronic component including a coil is known (see, for example, Patent Document 1). In this power supply device, for example, the bottom surface of the choke coil is provided in close contact with the main surface of the parallel plate portion on the substrate side for the purpose of radiating heat generated in the choke coil.

  In the power supply device described in Patent Document 1, a substrate in a region where an electronic component such as a choke coil is formed is cut out, and the electronic component is connected to the cut out region using a screw or the like. For this reason, since the board | substrate of the cut-out location is discarded, there is much waste and there exists a subject that cost increases, and it is contrary to the request | requirement, such as space saving of a board | substrate and size reduction of a power supply device.

  Therefore, for example, as described in Patent Document 2, a coil unit including a coil pattern formed in a substrate and a sheet metal coil connected to the coil pattern is known.

Japanese Patent No. 3334620 Japanese Patent No. 4635969

  However, when the coil portion described in Patent Document 2 is applied to the choke coil described in Patent Document 1, it is difficult to achieve both improvement in heat dissipation and reduction in size. For example, in order to dissipate the heat generated in the sheet metal coil, a method using a metal member for heat dissipation as described above is known, but in order to effectively perform this heat dissipation, the sheet metal coil and the heat dissipating member are used. The contact area with a metal member or the like must be increased. Therefore, it is difficult to reduce the size of the coil unit and the power supply device.

  Further, when a metal member for heat dissipation is provided under the substrate on which the coil pattern is formed, even if the heat generated on the substrate can be radiated, there is a substrate between the sheet metal coil and the metal member. Thus, the heat generated in the sheet metal coil is difficult to dissipate. If a metal member or the like for dissipating this heat is separately provided, it is difficult to reduce the size of the coil unit and the power supply device.

  The present invention has been made in view of the above, and an object of the present invention is to provide a winding component and a power supply device that can improve heat dissipation and can be downsized.

  A winding component according to the present invention includes a coil winding having a pair of magnetic cores facing each other, a plate-like conductive member, a coil portion and terminal portions provided at both ends of the coil portion, and a coil winding. A heat dissipating member for releasing heat from the wire, and a heat transfer member disposed between the coil winding and the heat dissipating member, and the coil part includes a flat plate part sandwiched between a pair of magnetic cores, A bent portion extending from the flat plate portion toward the heat dissipating member at a position not overlapping the magnetic core in plan view, and the heat transfer member contacts the heat dissipating member and the bent portion.

  In the winding component according to the present invention, the heat generated by the coil winding is transmitted from the bent portion to the heat radiating member through the heat transfer member by providing the heat radiating member and the heat transmitting member in contact with the bent portion. Is done. Thereby, the heat generated in the coil winding can be actively dissipated. In this case, since the bent portion extends from the flat plate portion toward the heat radiating member at a position that does not overlap the magnetic core in plan view, the area occupied by the coil winding in plan view can be reduced. As described above, in the winding component according to the present invention, heat dissipation can be improved and downsizing can be realized.

  The winding component according to the present invention further includes a coil substrate provided with a conductor pattern wound around the axis, and the coil winding is disposed between the coil substrate and the heat dissipation member, and The terminal portion may be electrically connected to one end of the conductor pattern and wound around the axis together with the conductor pattern. In this case, since the coil winding is disposed between the coil substrate and the heat radiating member, the heat generated by the coil winding is radiated from the bent portion through the heat transfer member without being obstructed by the coil substrate. It is reliably transmitted to the member. Thereby, the heat dissipation in winding components can be improved.

  In the winding component according to the present invention, the heat dissipating member has a planar base portion and a convex portion protruding from the base portion, and the convex portion does not overlap the coil winding in a plan view of the conductor pattern of the coil substrate. It may be arranged to be thermally connected to the region. In this case, since the conductor pattern of the coil substrate is thermally connected to the convex portion of the heat radiating member, the heat generated by the conductor pattern of the coil substrate can be actively radiated by the convex portion. Moreover, since the said convex part is arrange | positioned so that it may be thermally connected to the area | region which does not overlap with coil winding by planar view among the conductor patterns of a coil board | substrate, the said non-overlapping area | region is effectively utilized for heat dissipation This is preferable in realizing downsizing of the winding component.

  In the winding component according to the present invention, the bent portion has a bent end portion facing the surface of the base portion at an end portion thereof, and the heat transfer member is in contact with the surface of the base portion and the bent end portion. Good. In this case, the heat generated by the coil winding is transmitted from the bent end portion to the surface of the base portion of the heat dissipation member via the heat transfer member. Since the bent end faces the surface of the base of the heat dissipation member at the end of the bent portion, it is possible to secure a heat conduction path from the coil winding to the heat dissipation member within a small area in plan view. it can.

  In the winding component according to the present invention, the bent portion has a bent plate portion facing the surface facing the magnetic core in the convex portion, and the heat transfer member is in contact with the facing surface and the bent plate portion. May be. In this case, the heat generated by the coil winding is transmitted from the bent plate portion to the heat radiating member via the heat transfer member and the opposing surface. Since the bent plate portion faces the surface of the convex portion of the heat radiating member facing the magnetic core, the contact area between the heat transfer member and the coil winding is large, and heat can be radiated more effectively. .

  In the winding component according to the present invention, a plurality of bent portions may be formed at positions facing each other across the magnetic core in the coil portion. In this case, a plurality of heat conduction paths between the coil winding and the heat radiating member can be secured without requiring a large area in plan view. Thereby, after realizing miniaturization in the winding component, the heat dissipation can be further improved.

  In the winding component according to the present invention, the heat transfer member may be disposed between the magnetic core and the coil winding. In this case, since the heat generated in the coil winding can be transmitted to the magnetic core via the heat transfer member, the heat can be transferred to the heat radiating member via the magnetic core to be radiated. . Thereby, the heat conduction path from the coil winding to the heat radiating member can be expanded within the area occupied by the coil winding in plan view.

  In addition, this invention can also be called invention of a power supply device provided with winding components. Specifically, a power supply device according to the present invention includes the above-described winding component. In this case, heat dissipation in the power supply device can be improved and downsizing can be realized.

  ADVANTAGE OF THE INVENTION According to this invention, the winding component which can improve heat dissipation and can implement | achieve size reduction, and a power supply device can be provided.

It is a perspective view of the coil component concerning a 1st embodiment. It is a disassembled perspective view of the coil | winding components shown in FIG. It is a disassembled perspective view from the lower surface side (bottom surface side) of the coil | winding components of FIG. It is a perspective view of the coil winding with which the winding component shown in FIG. 1 is provided. It is a perspective view from the lower surface side (bottom surface side) of the coil winding of FIG. It is a perspective view of the coil board | substrate with which the coil | winding components shown in FIG. It is a perspective view from the lower surface side (bottom surface side) of the coil board | substrate of FIG. It is sectional drawing along the VIII-VIII line shown in FIG. It is sectional drawing along the IX-IX line shown in FIG. It is a disassembled perspective view of the coil | winding components which concern on 2nd Embodiment. It is a disassembled perspective view from the lower surface side (bottom surface side) of the coil | winding components of FIG. It is a perspective view of the coil winding with which the winding component shown in FIG. 10 is provided. It is a perspective view from the lower surface side (bottom surface side) side of the coil winding of FIG. It is a perspective view from the lower surface side (bottom surface side) of the coil board | substrate with which the coil | winding components shown in FIG. 1 are provided. It is a disassembled perspective view of the coil | winding components which concern on 3rd Embodiment. FIG. 10 is a view corresponding to the cross-sectional view of FIG. 9 in the winding component according to the third embodiment. It is a disassembled perspective view of the coil | winding components which concern on 4th Embodiment. FIG. 10 is a view corresponding to the cross-sectional view of FIG. 9 in the winding component according to the fourth embodiment. It is a perspective view of the coil component concerning a 5th embodiment. FIG. 20 is an exploded perspective view of the winding component shown in FIG. 19. It is a disassembled perspective view from the lower surface side (bottom surface side) of the coil | winding components of FIG. It is a perspective view of the coil winding with which the winding component shown in FIG. 20 is provided. It is a perspective view from the lower surface side (bottom surface side) of the coil winding of FIG. It is a perspective view of the coil board | substrate with which the coil | winding components shown in FIG. 19 are provided. It is a perspective view from the lower surface side (bottom surface side) of the coil board | substrate of FIG. It is sectional drawing along the XXVI-XXVI line shown in FIG. It is a figure which shows an example of the circuit block diagram of the switching power supply device at the time of using the coil | winding components shown in FIG. 1 as a smoothing choke coil in an output smoothing circuit.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description, the same reference numerals are used for the same elements or elements having the same function, and redundant description is omitted. In the drawings, XYZ axes are described as necessary for the explanation of the configuration.

(First embodiment)
With reference to FIGS. 1-9, the structure of the coil | winding components and power supply device which concern on 1st Embodiment of this invention is demonstrated. FIG. 1 is a perspective view of a winding component according to the first embodiment. FIG. 2 is an exploded perspective view of the winding component shown in FIG. FIG. 3 is an exploded perspective view from the lower surface side (bottom surface side) of the winding component of FIG. 2. 4 is a perspective view of a coil winding provided in the winding component shown in FIG. FIG. 5 is a perspective view from the lower surface side (bottom surface side) of the coil winding of FIG. 4. FIG. 6 is a perspective view of a coil substrate included in the winding component shown in FIG. FIG. 7 is a perspective view from the lower surface side (bottom surface side) of the coil substrate of FIG. 8 is a cross-sectional view taken along line VIII-VIII shown in FIG. 9 is a cross-sectional view taken along the line IX-IX shown in FIG.

  A power supply device according to an embodiment of the present invention generates a DC output voltage by converting (decreasing) a DC voltage input from, for example, a high voltage battery connected to an input terminal, and generates a DC output voltage from the output terminal. It is a switching power supply device such as a DC-DC converter that outputs to a battery. The switching power supply device includes a metal case that includes a substrate, electrical components, and the like.

  In FIG. 1, a portion that functions as the winding component 1 </ b> A in the switching power supply device 80 is cut out and shown. The housing 70 constitutes a part of a metal case of the switching power supply device 80. On the bottom surface side of the housing 70, for example, a radiation fin for cooling the housing 70 is provided, and the housing 70 is cooled by cooling the radiation fin by air cooling, and the switching placed on the upper surface side. Each component of the power supply device 80 is cooled. That is, the housing 70 constitutes a part of the outer shape of the switching power supply device 80 and also functions as a heat sink for releasing heat generated in the electrical components constituting the switching power supply device 80.

  As shown in FIGS. 2 and 3, the winding component 1A according to the present embodiment includes a coil substrate 10, a coil winding 20, a pair of magnetic cores 5A and 5B, heat transfer members 60 and 61, And a housing 70 as a heat radiating member. The winding component 1A can be applied to a transformer, a choke coil, or the like in the switching power supply device 80, for example.

  In the winding component 1A, a coil wound around the axis A extending in the Z-axis direction is formed by the conductor pattern in the coil substrate 10 extending along the XY plane and the coil winding 20. The coil winding 20 is sandwiched between a pair of magnetic cores 5A and 5B. The pair of magnetic cores 5A and 5B oppose each other along the axis A direction. The magnetic core 5A is an E-type magnetic core 5A in which a center leg 6 extending from a plate-shaped flat plate and a pair of outer legs 7 and 8 are arranged along the X axis. The magnetic core 5B is a flat I-shaped core. That is, the magnetic cores 5A and 5B are so-called EI type magnetic cores.

  The heat transfer members 60 and 61 are disposed between the coil winding 20 and the housing 70. The heat transfer members 60 and 61 are heat transfer sheets formed of, for example, silicone having insulating properties and heat conductivity. The heat transfer members 60 and 61 are preferably deformed while maintaining elasticity. The heat transfer members 60 and 61 transmit heat generated in the coil winding 20 to the housing 70 as a heat radiating member. The housing 70 includes a substantially planar base 71 and a convex portion 72 protruding from the base 71. The position where the convex portion 72 is provided is a position where the magnetic core 5B is not disposed. The convex part 72 is arrange | positioned so that the circumference | surroundings of the magnetic body core 5B may be enclosed. Details of the protrusion 72 will be described later. The base 71 may be provided with unevenness for placing the magnetic core 5B.

  The configuration of the coil winding 20 will be described in detail with reference to FIGS. 4 and 5. As shown in FIGS. 4 and 5, the coil winding 20 is a so-called sheet metal coil formed by winding a plate-like conductive member around the axis A for one turn. The coil winding 20 has an opening 20a at the center. The coil winding 20 may be manufactured by punching or bending a conductive metal plate such as copper.

  A terminal portion 22 is provided at one end of the coil winding 20. A terminal portion 23 is provided at the other end of the coil winding 20. The terminal portion 22 and the terminal portion 23 each have a plane along the X-axis and Y-axis directions, and are connected to one end of a conductor pattern of the coil substrate 10 described later on the plane.

  A region between the terminal portion 22 and the terminal portion 23 in the coil winding 20 functions as the coil portion 21. That is, terminal portions 22 and 23 are provided at both ends of the coil portion 21. The terminal part 22 is the starting end side of the coil part 21, and the terminal part 23 is the terminal end side of the coil part 21. The coil portion 21 is sandwiched between the pair of magnetic cores 5A and 5B and does not overlap with the magnetic cores 5A and 5B in plan view, and the flat plate portions 24 and 25 extending in a plane along the X axis and the Y axis. And bent portions 26 to 28 extending in a direction different from the direction in which the flat plate portions 24 and 25 extend from the flat plate portions 24 and 25 at the positions. In the present embodiment, the bent portions 26 to 28 extend from the flat plate portions 24 and 25 toward the housing 70 along the axis A direction.

  The bent portions 26 and 27 and the bent portion 28 face each other with the magnetic cores 5A and 5B interposed therebetween. That is, in the coil winding 20, a plurality of bent portions are formed at positions facing each other across the magnetic cores 5A and 5B in the coil portion 21.

  The bent portion 26 is bent at a position that does not overlap with the magnetic cores 5A and 5B in plan view, and extends from the flat plate portion 24 toward the housing 70 side (downward) along the Z-axis direction at that position ( 2 and 3). The bent portion 26 includes a bent plate portion 26b extending along the X-axis and Z-axis directions so as to connect the flat plate portion 24 and the terminal portion 22, and a bent portion provided at the end of the bent plate portion 26b. And an end portion 26a. The bent end 26a faces the surface 71a of the base 71 of the housing 70 (see FIG. 8). A heat transfer member 60 is disposed between the bent end portion 26a and the surface 71a.

  The bent portion 27 is bent at a position where it does not overlap with the magnetic cores 5A, 5B in plan view, and extends from the flat plate portion 25 toward the housing 70 side (downward) along the Z-axis direction at that position ( 2 and 3). The bent portion 27 includes a bent plate portion 27b extending along the X-axis and Z-axis directions so as to connect the flat plate portion 25 and the terminal portion 23, and a bent portion provided at the end of the bent plate portion 27b. And an end portion 27a. The bent end 27a faces the surface 71a of the base 71 of the housing 70 (see FIG. 8). A heat transfer member 60 is disposed between the bent end portion 27a and the surface 71a.

  The bent portion 28 is provided at a position facing the bent portion 26 and the bent portion 27 across the magnetic cores 5A and 5B. The bent portion 28 is bent at a position where it does not overlap with the magnetic cores 5A and 5B in plan view, and from both the flat plate portions 24 and 25 toward the housing 70 side (downward) along the Z-axis direction. It extends (see FIGS. 2 and 3). The bent portion 28 includes a bent plate portion 28b extending along the X-axis and Z-axis directions so as to connect the flat plate portion 24 and the flat plate portion 25, and a bent portion provided at the end of the bent plate portion 28b. And an end portion 28a. The bent end 28a faces the surface 71a of the base 71 of the housing 70 (see FIGS. 8 and 9). A heat transfer member 61 is disposed between the bent end portion 28a and the surface 71a.

  The bent portion 28 has a fixed portion that protrudes upward from an upper end portion on the opposite side of the bent end portion 28a of the bent portion 28, and that the end portion is planar along the X-axis and the Y-axis. 29, 30 are provided. The fixing portion 29 is positioned at one end along the X-axis direction of the upper end portion, and the fixing portion 30 is positioned at the other end along the X-axis direction of the upper end portion. The fixing part 29 and the fixing part 30 are used for fixing to the coil substrate 10. Thereby, the fixing | fixed part 29 and the fixing | fixed part 30 fix the coil winding 20 and the coil board | substrate 10 stably.

  The flat plate portions 24 and 25 are separated from the coil substrate 10 in a state where the terminal portions 22 and 23 and the fixing portions 29 and 30 are connected to the coil substrate 10 via solder. That is, the surfaces of the terminal portions 22 and 23 and the fixing portions 29 and 30 and the surfaces of the flat plate portions 24 and 25 are arranged at different height positions in the direction along the Z axis.

  In the coil winding 20, the current input to the terminal portion 22 on the start end side flows in the order of the bent portion 26, the flat plate portion 24, the bent portion 28, the flat plate portion 25, and the bent portion 27. Is output from the terminal portion 23 on the side.

  Next, the configuration of the coil substrate 10 will be described in detail with reference to FIGS. 6 and 7. In the present embodiment, the coil substrate 10 is a multilayer printed board in which insulating layers made of an insulating material and conductor layers on which a conductor pattern made of a conductor is alternately stacked, and the surface is covered with a resist layer. As shown in FIGS. 6 and 7, the coil substrate 10 has a surface 10 a that is opposite to the surface facing the housing 70, and a back surface 10 b that is the surface facing the housing 70. . The coil substrate 10 has an opening 10c into which the central leg 6 of the magnetic core 5A is fitted, an opening 10d into which the outer leg 7 of the magnetic core 5A is fitted, and a notch into which the outer leg 8 of the magnetic core 5A is fitted. Part 10e. The coil substrate 10 is provided with a conductor pattern 11.

  The conductor pattern 11 includes a first pattern 12, a second pattern 14, and a third pattern 16. The first pattern 12, the second pattern 14, and the third pattern 16 are formed so as to be separated from each other. The first pattern 12 includes a coil portion 12b, an end portion 12a and an end portion 12c that are continuously formed on the surface 10a of the coil substrate 10, and a connection portion 12d that is formed on the back surface 10b of the coil substrate 10. Contains. The coil portion 12b is formed to wind around the axis A passing through the center of the opening 10c of the coil substrate 10 for one turn. The end 12a and the end 12c are formed at both ends of the coil portion 12b. The connecting portion 12d is formed at a position corresponding to the end portion 12c in plan view.

  A through hole 19 that penetrates from the front surface 10a to the back surface 10b is formed in the end portion 12c and the connection portion 12d, and a metal layer formed by copper plating or the like is formed in the through hole 19 to thereby form the end portion 12c. And the connecting portion 12d are connected. A terminal portion 22 of the coil winding 20 is connected to the connecting portion 12d (one end of the first pattern 12) via solder or the like. Thus, the terminal part 22 is electrically connected to one end of the first pattern 12, whereby the coil part 12 b in the coil substrate 10 and the coil part 21 in the coil winding 20 are electrically connected. Therefore, the current input to the end portion 12a in the coil substrate 10 flows in the order of the coil portion 12b, the end portion 12c, and the connection portion 12d, and then the start end of the coil winding 20 that is electrically connected to the connection portion 12d. Flows to the terminal portion 22 on the side, and is output from the terminal portion 23 on the terminal side of the coil winding 20. Thereby, the coil substrate 10 and the coil winding 20 function as a two-turn coil as a whole.

  The 2nd pattern 14 is formed of the connection part 14a formed in the surface 10a, and the connection part 14b formed in the back surface 10b. An external electronic component may be connected to the connecting portion 14a by solder or the like. The terminal portion 23 of the coil winding 20 is connected to the connection portion 14b by solder or the like. A through hole 19 penetrating from the front surface 10a to the back surface 10b is formed in the connecting portion 14a and the connecting portion 14b, and a metal layer is formed in the through hole 19 by copper plating or the like, whereby the connecting portion 14a. And the connection part 14b are connected. Thereby, the connection part 14a to which an external electronic component is connected and the terminal part 23 on the terminal side of the coil part 21 in the coil winding 20 are electrically connected.

  The third pattern 16 is a planar conductor pattern formed in plural on the back surface 10b. The third pattern 16 is provided to radiate heat generated in the coil substrate 10. The third pattern 16 is placed on the convex portion 72 of the housing 70 (see FIGS. 8 and 9) and is thermally connected to the convex portion 72. As a result, the third pattern 16 transmits heat generated in the coil substrate 10 to the housing 70 due to a loss when a current is passed through the first pattern 12. The third pattern 16 is also provided to make the front surface (Z-axis direction) of the back surface 10b a more uniform plane. This improves the assembly accuracy of the winding component 1 </ b> A and suppresses the warp of the coil substrate 10.

  In addition to the conductor pattern 11, lands 17 and 18 are formed on the back surface 10 b of the coil substrate 10 by conductors that are not continuous with the conductor pattern 11. The land 17 is connected to the fixed portion 29 of the coil winding 20 via solder or the like. The land 18 is connected to the fixed portion 30 of the coil winding 20 via solder or the like.

  The winding component 1A is configured by combining the coil substrate 10 and the coil winding 20, the magnetic cores 5A and 5B, the heat transfer members 60 and 61, and the casing 70 as a heat dissipation member. . Specifically, referring to FIGS. 2 and 3, the magnetic core 5B is disposed on the housing 70, and the heat transfer members 60 and 61 are arranged along the long side (X-axis direction) of the magnetic core 5B. Be placed. The coil substrate 10 and the coil winding 20 to which the terminal portions 22 and 23, the fixing portions 29 and 30 and the connection portions 12d and 14b and the lands 17 and 18 are connected are arranged. Then, the magnetic core 5A is attached from above.

Next, a cross-sectional configuration of the winding component 1A configured as described above will be described with reference to FIGS. As shown in FIGS. 8 and 9, in the winding component 1 </ b> A, the coil substrate 10 is placed on the convex portion 72 of the housing 70. The convex portion 72 of the housing 70 is disposed so as to be thermally connected to a region of the third pattern 16 in the coil substrate 10 that does not overlap the coil winding 20 in plan view. The magnetic core has a larger bottom area of the magnetic core 5B than the magnetic core 5A. The reason for this is that the magnetic flux density can be reduced by increasing the cross-sectional area of the magnetic core 5B relative to the magnetic core 5A, that is, the loss of the magnetic core 5B can be reduced. This is because the temperature rise of the cores 5A and 5B can be suppressed.

  The heat transfer members 60 and 61 are placed on the base 71 of the housing 70 and are in contact with the base 71. The bent end portions 26 a and 27 a in the coil winding 20 are in contact with the heat transfer member 60 placed on the base 71. The bent end portion 28 a of the coil winding 20 is in contact with the heat transfer member 61 placed on the base 71 of the housing 70. That is, the heat transfer member 60 is sandwiched between the base portion 71 and the bent end portions 26a and 27a, and the heat transfer member 61 is sandwiched between the base portion 71 and the bent end portion 28a.

  As described above, according to the winding component 1 </ b> A according to the present embodiment, the heat transfer member 60 that contacts the housing 70 and the bent portions 26 and 27, and the heat transfer member 61 that contacts the housing 70 and the bent portion 28. , The heat generated in the coil winding 20 is transmitted from the bent portions 26 and 27 to the casing 70 which is a heat radiating member via the heat transfer member 60 and transmitted from the bent portion 28. The heat is transmitted to the housing 70 which is a heat radiating member via the heat member 61. Thereby, the heat generated in the coil winding 20 can be actively dissipated. In this case, the bent portions 26 to 28 extend from the flat plate portions 24 and 25 toward the housing 70 at positions that do not overlap with the magnetic cores 5A and 5B in plan view, so that the coil winding 20 is seen in plan view. The area occupied by can be reduced. As described above, in the winding component 1 </ b> A according to the present embodiment, heat dissipation can be improved and downsizing can be realized.

  According to the winding component 1A, since the coil winding 20 is disposed between the coil substrate 10 and the housing 70, the heat generated by the coil winding 20 is not hindered by the coil substrate 10 and can be folded. The curved portions 26 to 28 are reliably transmitted to the housing 70 through the heat transfer members 60 and 61. Thereby, the heat dissipation in 1 A of winding components can be improved.

  According to the winding component 1A, since the third pattern 16 that is the conductor pattern of the coil substrate 10 is thermally connected to the convex portion 72 of the housing 70, the heat generated in the conductor pattern 11 of the coil substrate 10 can also be reduced. The projection 72 can actively dissipate heat. Moreover, since the said convex part 72 is arrange | positioned so that it may thermally connect to the area | region which does not overlap with the coil winding 20 in planar view among the conductor patterns 11 of the coil board | substrate 10, the said area | region which does not overlap is heat-radiated. Therefore, it can be effectively used for this purpose, and is suitable for realizing downsizing of the winding component.

  According to the winding component 1A, the heat generated in the coil winding 20 is transferred from the bent end portions 26a, 27a, and 28a to the surface 71a of the base portion 71 of the casing 70 through the heat transfer members 60 and 61. The Since the bent end portions 26a, 27a, and 28a face the surface 71a of the base 71 of the housing 70 at the ends of the bent portions 26, 27, and 28, the coil winding is performed within a small area in plan view. A heat conduction path from 20 to the housing 70 can be secured.

  According to the winding component 1A, a plurality of bent portions are formed at positions facing each other across the magnetic cores 5A and 5B in the coil portion 21, so that a large area is not required in plan view. A plurality of heat conduction paths between the coil winding 20 and the housing 70 can be secured. Thereby, after realizing miniaturization in the winding component, the heat dissipation can be further improved.

  Further, according to the winding component 1A, the surfaces of the terminal portions 22, 23 and the fixing portions 29, 30 and the surfaces of the flat plate portions 24, 25 are arranged at different height positions in the direction along the Z axis. Therefore, the terminal portions 22 and 23 and the fixing portions 29 and 30 can be easily connected to the coil substrate 10 by soldering. Further, since the terminal portions 22 and 23 and the fixing portions 29 and 30 are connected to the coil substrate 10 via solder, the flat plate portions 24 and 25 are separated from the coil substrate 10. A gap can be provided between the formed conductor pattern 11 and the flat plate portions 24 and 25, and the capacitance generated between the conductor pattern 11 and the flat plate portions 24 and 25 can be reduced, and a high frequency (noise) component can be obtained. Can be suppressed.

  Further, it is preferable that the heat transfer members 60 and 61 are deformed while maintaining elasticity. In this case, the heat transfer member 60 is sandwiched between the base portion 71 and the bent end portions 26a and 27a, and the heat transfer member 61 is sandwiched between the base portion 71 and the bent end portion 28a. 60 and 61 can also function as vibration-proof materials.

(Second Embodiment)
Next, the winding component according to the second embodiment will be described with reference to FIGS. FIG. 10 is an exploded perspective view of the winding component according to the second embodiment. FIG. 11 is an exploded perspective view from the lower surface side (bottom surface side) of the winding component of FIG. 10. 12 is a perspective view of a coil winding provided in the winding component shown in FIG. 13 is a perspective view from the lower surface side (bottom surface side) of the coil winding of FIG. FIG. 14 is a perspective view from the lower surface side (bottom surface side) of the coil substrate included in the winding component shown in FIG. 1.

  As shown in FIGS. 10 to 14, the winding component 1 </ b> B according to the second embodiment is different from the winding component 1 </ b> A according to the first embodiment in that the number of turns in the coil winding is increased, This is a point where the number of fixing points with respect to the coil substrate is increased corresponding to the increase in the number of turns. That is, the winding component 1B according to the present embodiment includes a coil winding 20B instead of the coil winding 20 in the winding component 1A, and includes a coil substrate 10B instead of the coil substrate 10 in the winding component 1A. .

  First, the coil winding 20B will be described with reference to FIGS. As shown in FIGS. 12 and 13, the coil winding 20B is formed by winding a plate-like conductive member around the axis A for two turns, and has an opening 20a in the center. A terminal portion 22 is provided at one end of the coil winding 20B, and a terminal portion 23 is provided at the other end of the coil winding 20B.

  In the coil portion 21 between the terminal portion 22 and the terminal portion 23, an inner peripheral first coil portion 211 that forms the first turn and an outer peripheral second coil portion 212 that forms the second turn are continuous. Is formed. The terminal part 22 is provided in the edge part on the opposite side to the side connected to the 2nd coil part 212 among the 1st coil parts 211. FIG. The terminal part 23 is provided in the edge part on the opposite side to the side connected to the 1st coil part 211 among the 2nd coil parts 212. FIG.

  The first coil portion 211 is sandwiched between a pair of magnetic cores 5A and 5B and extends in a planar shape along the X and Y axes, and the magnetic cores 5A and 5B in a plan view. And bent portions 261, 271, 281 extending in a direction different from the flat plate portions 24A, 25A at positions where they do not overlap. In the present embodiment, the bent portions 261, 271, 281 extend from the flat plate portions 24A, 25A toward the housing 70 along the axis A direction.

  The bent portions 261 and 271 and the bent portion 281 are opposed to each other with the magnetic cores 5A and 5B interposed therebetween. That is, in the coil winding 20 </ b> B, a plurality of bent portions are formed at positions facing each other across the magnetic cores 5 </ b> A and 5 </ b> B in the first coil portion 211.

  The bent portion 261 is bent at a position that does not overlap the magnetic cores 5A and 5B in plan view, and extends from the flat plate portion 24A toward the housing 70 side (downward) along the Z-axis direction at that position ( FIG. 11). The bent portion 261 includes a bent plate portion 261b extending along the X-axis and Z-axis directions so as to connect the flat plate portion 24A and the terminal portion 22, and a bent portion provided at the end of the bent plate portion 261b. And an end portion 261a. The bent end 261 a faces the surface 71 a of the base 71 of the housing 70. A heat transfer member 60 is disposed between the bent end 261a and the surface 71a.

  The bent portion 271 is bent at a position that does not overlap the magnetic cores 5A and 5B in plan view, and extends from the flat plate portion 25A toward the housing 70 side (downward) along the Z-axis direction at that position ( FIG. 11). The bent portion 271 includes a bent plate portion 271b connected to the second coil portion 212 via the connecting portion 32, and a bent end portion 271a provided at the end of the bent plate portion 271b. Yes. The bent end 271 a faces the surface 71 a of the base 71 of the housing 70. A heat transfer member 60 is disposed between the bent end 271a and the surface 71a.

  The bent portion 281 is provided at a position facing the bent portion 261 and the bent portion 271 with the magnetic cores 5A and 5B interposed therebetween. The bent portion 281 is bent at a position that does not overlap with the magnetic cores 5A and 5B in a plan view, and from both the flat plate portions 24A and 25A toward the housing 70 side (downward) along the Z-axis direction. It extends (see FIG. 11). The bent portion 281 includes a bent plate portion 281b extending along the X-axis and Z-axis directions so as to connect the flat plate portion 24A and the flat plate portion 25A, and a bent portion provided at the end of the bent plate portion 281b. And an end portion 281a. The bent end 281 a faces the surface 71 a of the base 71 of the housing 70. A heat transfer member 61 is disposed between the bent end 281a and the surface 71a.

  The bent portion 281 has a fixed portion protruding upward from an upper end opposite to the bent end 281a of the bent portion 281 and having an end that is planar along the X axis and the Y axis. 29A and 30A are provided. The fixing portions 29A and 30A are arranged at a portion extending between the flat plate portion 24A and the flat plate portion 25A at the upper side end portion, in which the fixing portion 29A is located on the flat plate portion 24A side, and the fixing portion 30A is a flat plate. It is located on the part 25A side. The fixing portion 29A and the fixing portion 30A are used for fixing to the coil substrate 10B. Thereby, the fixing part 29A and the fixing part 30A stably fix the coil winding 20B and the coil substrate 10B.

  The second coil portion 212 is arranged in the direction of the axis A from the flat plate portions 24B and 25B at a position where it does not overlap with the magnetic cores 5A and 5B in plan view, between the flat plate portions 24B and 25B sandwiched between the pair of magnetic cores 5A and 5B. And bent portions 262, 272, and 282 extending toward the housing 70.

  The bent portions 262 and 272 and the bent portion 282 face each other with the magnetic cores 5A and 5B interposed therebetween. That is, in the coil winding 20 </ b> B, a plurality of bent portions are formed at positions facing each other across the magnetic cores 5 </ b> A and 5 </ b> B in the second coil portion 212.

  The bent portion 262 is bent at a position that does not overlap the magnetic cores 5A and 5B in plan view, and extends from the flat plate portion 24B toward the housing 70 side (downward) along the Z-axis direction at that position ( FIG. 11). The bent portion 262 includes a bent plate portion 262b connected to the first coil portion 211 via the connecting portion 32, and a bent end portion 262a provided at the end of the bent plate portion 262b. Yes. The bent end 262 a faces the surface 71 a of the base 71 of the housing 70. A heat transfer member 60 is disposed between the bent end 262a and the surface 71a.

  The bent portion 272 is bent at a position that does not overlap the magnetic cores 5A and 5B in plan view, and extends from the flat plate portion 25B toward the housing 70 along the Z-axis direction at the position (see FIG. 11). ). The bent portion 272 includes a bent plate portion 272b extending along the X-axis and Z-axis directions so as to connect the flat plate portion 25B and the terminal portion 23, and a bent portion provided at the end of the bent plate portion 272b. And an end portion 272a. The bent end 272 a faces the surface 71 a of the base 71 of the housing 70. A heat transfer member 60 is disposed between the bent end 272a and the surface 71a.

  The bent portion 282 is provided at a position facing the bent portion 262 and the bent portion 272 across the magnetic cores 5A and 5B. The bent portion 282 is bent at a position that does not overlap the magnetic cores 5A and 5B in plan view, and extends from both the flat plate portions 24B and 25B toward the housing 70 along the Z-axis direction at the position. . The bent portion 282 includes a bent plate portion 282b extending along the X-axis and Z-axis directions so as to connect the flat plate portion 24B and the flat plate portion 25B, and a bent portion provided at the end of the bent plate portion 282b. It has an end portion 282a and a notch portion 282c formed in a part of the bent plate portion 282b. The bent end 282 a faces the surface 71 a of the base 71 of the housing 70. A heat transfer member 61 is disposed between the bent end 282a and the surface 71a.

  The bent portion 282 has a fixed portion that protrudes upward from an upper end on the opposite side to the bent end 282a of the bent portion 282, and that the end is a planar shape along the X axis and the Y axis. 29B and 30B are provided. The fixing portion 29B is located at one end along the X-axis direction of the upper side end portion, and the fixing portion 30B is located at the other end along the X-axis direction of the upper side end portion. The fixing portion 29B and the fixing portion 30B are used for fixing to the coil substrate 10B. Thereby, the fixing | fixed part 29B and the fixing | fixed part 30B fix the coil winding 20B and the coil board | substrate 10B stably.

  Note that the bent portions 261, 271, 281, 262, 272, and 282 in the coil winding 20B are provided at intervals so as not to contact each other.

  In the coil winding 20 </ b> B, the current input to the terminal portion 22 on the start end side is the bent portion 261, the flat plate portion 24 </ b> A, the bent portion 281, the flat plate portion 25 </ b> A, the bent portion 271, the connecting portion 32, and the bent portion 262. The flat plate portion 24B, the bent portion 282, the flat plate portion 25B, and the bent portion 272 flow in this order and output from the terminal portion 23 on the terminal side. Thereby, the coil winding 20B functions as a two-turn coil.

  Next, the coil substrate 10B will be described with reference to FIG. Similar to the coil substrate 10 according to the first embodiment, the conductor pattern 11 is provided on the coil substrate 10B. The conductor pattern 11 includes a first pattern 12, a second pattern 14, and a third pattern 16. The configurations of the first pattern 12 and the second pattern 14 are the same as those of the coil substrate 10 according to the first embodiment. Compared with the coil substrate 10 according to the first embodiment, the coil substrate 10B is different in that a land corresponding to the fixing portion of the coil winding 20B is newly provided on the back surface 10b of the coil substrate 10. This will be specifically described below.

  On the back surface 10b of the coil substrate 10B, the terminal portion 22 of the coil winding 20B is connected to the connection portion 12d (one end of the first pattern 12) via solder or the like. By forming a metal layer by copper plating or the like in the through hole 19 formed in the connection portion 12d and the end portion 12c, the connection portion 12d and the end portion 12c are connected. Thus, the terminal part 22 is electrically connected to one end of the first pattern 12, whereby the coil part 12b in the coil substrate 10B and the coil part 21 in the coil winding 20B are electrically connected. In the coil substrate 10B, the current input to the end portion 12a flows in the order of the coil portion 12b, the end portion 12c, and the connection portion 12d, and then the terminal on the start end side of the coil winding 20B electrically connected to the connection portion 12d. It flows to the part 22 and is output from the terminal part 23 on the terminal side of the coil winding 20B. Thereby, the coil substrate 10B and the coil winding 20B function as a three-turn coil as a whole.

  The terminal portion 23 of the coil winding 20B is connected to the connection portion 14b by solder or the like. By forming a metal layer by copper plating or the like in the through hole 19 formed in the connection portion 14a and the connection portion 14b, the connection portion 14a and the connection portion 14b are connected. Thereby, the connection part 14a electrically connected with an external electronic component and the terminal part 23 of the terminal side of the coil part 21 in the coil winding 20B are electrically connected.

  In addition to the lands 17 and 18, lands 17 </ b> A and 18 </ b> A are formed on the back surface 10 b of the coil substrate 10 </ b> B by a conductor that is not continuous with the first pattern 12. The land 17 is connected to the fixed portion 29B of the coil winding 20B via solder or the like. The land 18 is connected to the fixed portion 30B of the coil winding 20B via solder or the like. The land 17A is connected to the fixed portion 29A of the coil winding 20B via solder or the like. The land 18A is connected to the fixed portion 30A of the coil winding 20B via solder or the like.

  In the third pattern 16 on the back surface 10b of the coil substrate 10B, a recess 16a provided for arranging the land 17A and a recess 16b provided for arranging the land 18A are formed. The third pattern 16 and the lands 17 and 18 do not have to be insulated. However, when insulated, the insulating portion between the third pattern 16 and the lands 17 and 18 causes static Electric capacity can be reduced.

  In the winding component 1B configured by combining the coil substrate 10B and the coil winding 20B, the magnetic cores 5A and 5B, the heat transfer members 60 and 61, and the casing 70 as a heat dissipation member, The coil substrate 10 </ b> B is placed on the convex portion 72 of the housing 70. The convex portion 72 of the housing 70 is disposed so as to be thermally connected to a region of the third pattern 16 in the coil substrate 10B that does not overlap the coil winding 20 in plan view.

  The bent ends 261a, 271a, 262a, 272a of the coil winding 20B are in contact with the heat transfer member 60 mounted on the base 71, respectively. The bent end portions 281 a and 282 a in the coil winding 20 </ b> B are in contact with the heat transfer member 61 placed on the base 71 of the housing 70.

  As described above, according to the winding component 1 </ b> B according to the present embodiment, the heat generated in the two-turn coil winding 20 </ b> B passes through the heat transfer members 60 and 61 from the bent portions 261, 271, 281, 262, 272 and 282. Therefore, the heat generated in the coil winding 20 can be actively dissipated. In this case, the bent portions 261, 271, 281, 262, 272, and 282 are not positioned to overlap the magnetic cores 5A and 5B in plan view from the flat plate portions 24A, 25A, 24B, and 25B toward the housing 70 side. Since it extends, the area occupied by the coil winding 20A in plan view can be reduced. From the above, even if the number of turns of the coil winding is plural, the heat dissipation can be improved and the size can be reduced.

  Further, the winding component 1B according to the present embodiment has the fixing portions 29A, 30A, 29B, and 30B. That is, the number of fixing points with respect to the coil substrate is increased corresponding to the increase in the number of turns in the coil winding 20B. Thereby, even if the number of turns of the coil winding is plural, the coil winding 20B and the coil substrate 10B can be stably fixed.

(Third embodiment)
Next, the winding component according to the third embodiment will be described with reference to FIGS. FIG. 15 is an exploded perspective view of the winding component according to the third embodiment. FIG. 16 is a view corresponding to the cross-sectional view of FIG. 9 in the winding component according to the third embodiment.

  As shown in FIGS. 15 to 16, the winding component 1 </ b> C according to the third embodiment is different from the winding component 1 </ b> A according to the first embodiment in that the heat transfer member is magnetic in the convex portion 72 of the housing 70. It is the point which is contacting the opposing surface with body core 5A, 5B. That is, the winding component 1C according to the present embodiment includes the heat transfer members 62 and 63 instead of the heat transfer members 60 and 61 in the winding component 1A.

  The bent plate portions 26 b and 27 b of the bent portions 26 and 27 in the coil winding 20 are opposed to the facing surfaces 72 a of the convex portions 72 of the housing 70 facing the magnetic cores 5 A and 5 B. The heat transfer member 62 is disposed between the facing surface 72a and the bent plate portions 26b and 27b, and is in contact with the facing surface 72a and the bent plate portions 26b and 27b. Thereby, the heat generated by the loss in the coil winding 20 is transmitted from the bent plate portions 26b and 27b to the housing 70 through the heat transfer member 62 and the facing surface 72a.

  Similarly, the bent plate portion 28b of the bent portion 28 in the coil winding 20 faces the facing surface 72a of the convex portion 72 of the housing 70 facing the magnetic cores 5A and 5B. The heat transfer member 63 is disposed between the facing surface 72a and the bent plate portion 28b, and is in contact with the facing surface 72a and the bent plate portion 28b. Thereby, the heat generated by the loss in the coil winding 20 is transmitted from the bent plate portion 28b to the housing 70 through the heat transfer member 62 and the facing surface 72a. The heat transfer members 62 and 63 may be provided together with the heat transfer members 60 and 61.

  As described above, according to the winding component 1 </ b> C according to the present embodiment, the heat generated in the coil winding 20 passes from the bent portions 26 to 28 to the housing 70 that is a heat radiating member via the heat transfer members 62 and 63. Since it is transmitted, heat dissipation can be improved and downsizing can be realized as in the above embodiment. Further, since the bent plate portions 26b, 27b, 28b in the coil winding 20 are opposed to the facing surfaces 72a of the convex portions 72 of the casing 70 facing the magnetic cores 5A, 5B, the heat transfer members 62, 63 are provided. And the coil winding 20 have a large contact area, and heat can be radiated more effectively.

(Fourth embodiment)
Next, the winding component according to the fourth embodiment will be described with reference to FIGS. 17 to 18. FIG. 17 is an exploded perspective view of a winding component according to the fourth embodiment. FIG. 18 is a view corresponding to the cross-sectional view of FIG. 9 in the winding component according to the fourth embodiment.

  As shown in FIGS. 17 to 18, the winding component 1 </ b> D according to the fourth embodiment is different from the winding component 1 </ b> A according to the first embodiment in that the heat transfer member includes the coil winding 20 and the housing 70. It is a point arrange | positioned not only between but between the coil winding 20 and the magnetic body core 5B. That is, the winding component 1D according to the present embodiment includes a heat transfer member 64 instead of the heat transfer members 60 and 61 in the winding component 1A.

  The heat transfer member 64 is formed by bending a substantially square heat transfer sheet having an opening along the outer shape of the magnetic core 5B. The heat transfer member 64 is formed with a covering portion 64c sandwiched between the coil winding 20 and the magnetic core 5B, and a flange portion protruding from between the coil winding 20 and the magnetic core 5B.

  The covering portion 64c is disposed between the flat plate portions 24 and 25 of the coil winding 20 and the magnetic core 5B, and is formed so as to cover the magnetic core 5B. The covering portion 64c is in contact with the surface of the magnetic core 5B (see FIG. 18). The covering portion 64c has a surface that contacts the flat plate portions 24 and 25 of the coil winding 20 and a surface that contacts and faces the bent plate portions 26b, 27b, and 28b of the coil winding 20. doing. An opening 64d for fitting the central leg portion 6 of the magnetic core 5A is formed in the covering portion 64c.

  The bent end portions 26a and 27a of the coil winding 20 are placed on the leg portion 64a. That is, the leg portion 64a is in contact with the bent end portions 26a and 27a (see FIG. 18). The bent end portion 28a of the coil winding 20 is placed on the leg portion 64b. That is, the leg portion 64b is in contact with the bent end portion 28a (see FIG. 18).

  As described above, according to the winding component 1 </ b> D according to the present embodiment, the heat generated in the coil winding 20 is transmitted from the bent portions 26 to 28 to the casing 70 that is a heat dissipation member via the heat transfer member 64. Therefore, the heat dissipation can be improved and the size can be reduced as in the above embodiment. Furthermore, the heat transfer member 64 has a surface that contacts the flat plate portions 24 and 25 of the coil winding 20 and a surface that contacts the bent plate portions 26 b, 27 b, and 28 b of the coil winding 20. Since it has, there is much contact area of the heat-transfer member 64 and the coil winding 20, and it can thermally radiate more effectively.

  Further, in addition to transferring the heat generated by the loss in the coil winding 20 to the housing 70 via the leg portions 64a and 64b of the heat transfer member 64, the magnetic force is applied via the covering portion 64c of the heat transfer member 64. Since it can be transmitted also to the body core 5B, heat can be transmitted to the housing 70 via the magnetic body core 5B to dissipate heat. As a result, the heat conduction path from the coil winding 20 to the housing 70 can be expanded within the area occupied by the coil winding 20 in plan view.

(Fifth embodiment)
Next, the winding component according to the fifth embodiment will be described with reference to FIGS. FIG. 19 is a perspective view of a winding component according to the fifth embodiment. 20 is an exploded perspective view of the winding component shown in FIG. FIG. 21 is an exploded perspective view from the lower surface side (bottom surface side) of the winding component of FIG. 20. FIG. 22 is a perspective view of a coil winding provided in the winding component shown in FIG. FIG. 23 is a perspective view from the lower surface side (bottom surface side) of the coil winding of FIG. FIG. 24 is a perspective view of a coil substrate included in the winding component shown in FIG. FIG. 25 is a perspective view from the lower surface side (bottom surface side) of the coil substrate of FIG. 26 is a cross-sectional view taken along line XXVI-XXVI shown in FIG.

  The winding component 1E according to the fifth embodiment is different from the winding component 1A according to the first embodiment in that the magnetic core is a UI type, and the shape of the conductor pattern and coil winding is changed accordingly. In addition, the heat dissipation area on the coil substrate side is enlarged. This will be specifically described below.

  As shown in FIGS. 19 to 21, the winding component 1 </ b> E includes a coil substrate 101, a coil winding 40, a pair of magnetic cores 50 </ b> A and 50 </ b> B, heat transfer members 65 and 66, and a housing as a heat dissipation member. And a body 70. In the winding component 1E, a coil wound around the axis A extending in the Z-axis direction is formed by the conductor pattern in the coil substrate 101 extending along the XY plane and the coil winding 40.

  The coil winding 40 is sandwiched between a pair of magnetic cores 50A and 50B. The pair of magnetic cores 50A and 50B face each other along the axis A direction. The magnetic core 50A is a U-shaped magnetic core in which a pair of leg portions 7A and 8A are arranged along the X axis. The magnetic core 50B is a flat I-shaped core. That is, the magnetic cores 50A and 50B are so-called UI type magnetic cores. The coil winding 40 forms a coil corresponding to one turn by a plate-like conductive member penetrating between the leg portions 7A and 8A in the magnetic cores 5A and 5B. That is, the coil winding 40 functions as a coil wound for one turn. The coil winding 40 may be manufactured by punching or bending a conductive metal plate such as copper.

  The heat transfer members 65 and 66 are disposed between the coil winding 40 and the housing 70. The heat transfer members 65 and 66 are heat transfer sheets formed of, for example, silicone having insulating properties and heat conductivity. The heat transfer members 65 and 66 transmit the heat generated in the coil winding 40 to the housing 70 as a heat radiating member. The heat transfer member 65 has a substantially I shape, and the heat transfer member 66 has a substantially L shape.

  The configuration of the coil winding 40 will be described in detail with reference to FIGS. As shown in FIGS. 22 and 23, a terminal portion 42 is provided at one end of the coil winding 40. A terminal portion 43 is provided at the other end of the coil winding 40. The terminal portion 42 and the terminal portion 43 each have a plane along the X-axis and Y-axis directions, and are connected to one end of a conductor pattern of the coil substrate 101 described later on the plane.

  A region between the terminal portion 42 and the terminal portion 43 in the coil winding 40 functions as the coil portion 41. That is, terminal portions 42 and 43 are provided at both ends of the coil portion 41. If the terminal portion 42 is defined as the start end side of the coil portion 41, the terminal portion 43 is the end side of the coil portion 41. The coil portion 41 is sandwiched between the pair of magnetic cores 50A and 50B and extends in a planar shape along the X axis and the Y axis, and at a position where it does not overlap with the magnetic cores 50A and 50B in plan view. And bent portions 45 and 46 extending in a direction different from the direction in which the flat plate portion 44 extends from the flat plate portion 44. In the present embodiment, the bent portions 45 and 46 extend from the flat plate portion 44 toward the housing 70 along the axis A direction.

  The bent portions 45 and 46 are bent at positions where they do not overlap the magnetic cores 50A and 50B in plan view, and extend from the flat plate portion 44 toward the housing 70 side (downward) along the Z-axis direction at the positions. (See FIG. 20 and FIG. 21). The bent portion 45 includes a bent plate portion 45b extending along the X-axis and Z-axis directions so as to connect the flat plate portion 44 and the terminal portion 42, and a bent portion provided at the end of the bent plate portion 45b. And an end 45a. The bent end 45a faces the surface 71a of the base 71 of the housing 70 (see FIG. 26). A heat transfer member 65 is disposed between the bent end 45a and the surface 71a.

  The bent portion 46 has a substantially L shape in a plan view, and the bent plate portion 45b and the bent plate portion 45b facing each other with the magnetic cores 50A and 50B sandwiched between the bent plate portion 45b and the bent plate portion 45b. A bent plate portion 46c extending in a direction crossing the terminal plate 43 and connected to the terminal portion 43, and a bent end portion 46a provided at the end of the bent plate portion 46b and the bent plate portion 46c. Yes. The bent end 46a faces the surface 71a of the base 71 of the housing 70 (see FIG. 26). A heat transfer member 66 is disposed between the bent end 46a and the surface 71a.

  The bent portion 46 is fixed to the bent plate portion 46b so as to protrude upward from the upper end portion on the opposite side of the bent end portion 46a, and the end portion is formed in a planar shape along the X axis and the Y axis. A portion 48 is provided. The fixing portion 48 is located at one end along the X-axis direction of the upper end portion of the bent plate portion 46b. The fixing portion 48 is used for fixing the coil substrate 101 and stably fixes the coil winding 40 and the coil substrate 101.

  In the coil winding 40, the current input to the terminal portion 42 on the start end side flows in the order of the bent portion 45, the flat plate portion 44, and the bent portion 46, and is output from the terminal portion 43 on the terminal end side.

  Next, the configuration of the coil substrate 101 will be described in detail with reference to FIGS. 24 and 25. In the present embodiment, the coil substrate 101 is similar to the coil substrate 10 of the first embodiment in that the front surface 101a is the opposite surface to the facing surface of the housing 70 and the back surface 101b is the facing surface of the housing 70. ,have. The coil substrate 101 has an opening 101c into which the leg portion 7A of the magnetic core 50A is fitted. The coil substrate 101 is provided with a conductor pattern 111.

  The conductor pattern 111 includes a first pattern 121, a second pattern 141, and a third pattern 161. The first pattern 121, the second pattern 141, and the third pattern 161 are formed to be separated from each other. The first pattern 121 includes a coil portion 121b, an end portion 121a and an end portion 121c that are continuously formed on the surface 101a of the coil substrate 101, and a connection portion 121d that is formed on the back surface 101b of the coil substrate 101. Contains. The coil portion 121b is formed to wind around the axis A passing through the center of the opening 101c of the coil substrate 101 for one turn. The end part 121a and the end part 121c are formed at both ends of the coil part 121b. The connecting portion 121d is formed at a position corresponding to the end portion 121c in plan view.

  The end 121c and the connecting part 121d are formed with a through hole 19 penetrating from the front surface 101a to the back surface 101b. By forming a metal layer by copper plating or the like in the through hole 19, the end 121c is formed. And the connection part 121d are connected. The terminal part 42 of the coil winding 40 is connected to the connecting part 121d (one end of the first pattern 121) via solder or the like. As described above, the terminal portion 42 is electrically connected to one end of the first pattern 121, whereby the coil portion 121 b in the coil substrate 101 and the coil portion 41 in the coil winding 40 are electrically connected. Therefore, the current input to the end portion 121a in the coil substrate 101 flows from the connection portion 121d to the terminal portion 42 on the start end side of the coil winding 40 after flowing through the coil portion 121b and the end portion 121a, and the terminal portion on the end side. 23. Thereby, the coil substrate 101 and the coil winding 40 function as a two-turn coil as a whole.

  The second pattern 141 is formed by a connection portion 141a formed on the front surface 101a and a connection portion 141b formed on the back surface 101b. External electronic components may be connected to the connecting portion 141a by solder or the like. The terminal portion 43 of the coil winding 40 is connected to the connecting portion 141b by solder or the like. The connecting portion 141a and the connecting portion 141b are formed with a through hole 19 penetrating from the front surface 101a to the back surface 101b, and a metal layer formed by copper plating or the like is formed in the through hole 19 so that the connecting portion 141a is formed. And the connecting portion 141b are connected. Thereby, the connection part 141a to which an external electronic component is connected and the terminal part 43 on the terminal side of the coil part 41 in the coil winding 40 are electrically connected.

  The third pattern 161 is a planar conductor pattern formed in plural on the back surface 101b. The third pattern 161 is provided to radiate heat generated in the coil substrate 101. The third pattern 161 is formed in a range that is not continuous with the first pattern 121 and the second pattern 141, and has a larger area than the third pattern 16 according to the first embodiment. The third pattern 161 is placed on the convex portion 72 of the housing 70 (see FIG. 26), and is thermally connected to the convex portion 72. As a result, the third pattern 161 transmits heat generated in the coil substrate 101 to the housing 70 due to a loss when a current is passed through the first pattern 121. Further, the third pattern 161 is formed with a concave portion 161 a provided for arranging the land 171.

  In addition to the conductor pattern 111, the land 171 is formed of a conductor that is not continuous with the conductor pattern 111. The land 171 is connected to the fixed portion 48 of the coil winding 40 via solder or the like.

  The winding component 1E is configured by combining the coil substrate 101 and the coil winding 40, the magnetic cores 50A and 50B, the heat transfer members 65 and 66, and the casing 70 as a heat dissipation member. . Specifically, referring to FIGS. 20 and 21, the magnetic core 50B is disposed on the housing 70, and the heat transfer members 65 and 66 are arranged along the long side (X-axis direction) of the magnetic core 50B. Be placed. The coil substrate 101 and the coil winding 40 to which the terminal portions 42 and 43, the fixing portion 48, the connection portions 121d and 141b, and the land 171 are connected are arranged. Then, the magnetic core 5A is attached from above.

  Next, a cross-sectional configuration of the winding component 1E configured as described above will be described with reference to FIG. As shown in FIG. 26, in the winding component 1 </ b> E, the coil substrate 101 is placed on the convex portion 72 of the housing 70. The convex portion 72 of the housing 70 is disposed so as to be thermally connected to a region of the third pattern 161 in the coil substrate 101 that does not overlap the coil winding 20 in plan view.

  The heat transfer members 65 and 66 are placed on the base 71 of the housing 70 and are in contact with the base 71. The bent end 45 a of the coil winding 40 is in contact with the heat transfer member 65 placed on the base 71. The bent end 46 a of the coil winding 40 is in contact with the heat transfer member 66 placed on the base 71 of the housing 70. The heat transfer member 66 corresponds to the shape of the bent portion 46 formed in a substantially L shape in plan view, and has a substantially L shape (see FIGS. 20 and 21).

  As described above, according to the winding component 1E according to the present embodiment, the heat generated in the coil winding 40 passes from the bent portions 45 and 46 to the casing 70 that is a heat radiating member via the heat transfer members 65 and 66. Since it is transmitted, heat dissipation can be improved and downsizing can be realized as in the above embodiment. In particular, since the heat dissipation of the coil substrate 101 and the coil winding 40 can be improved as compared with the heat dissipation from the magnetic cores 50A and 50B, there is less loss of the magnetic core like a smoothing choke coil. This is useful when the loss of the coil portion in the substrate and the coil winding becomes large.

  Furthermore, the winding component 1E according to the present embodiment has the third pattern 161 having a larger area than the third pattern 16 according to the first embodiment. The heat dissipation as the whole wire component 1E can be improved more.

  Next, an example of a power supply device including the winding components 1A to 1E will be described. FIG. 27 is a diagram showing an example of a circuit configuration diagram of the switching power supply device 80 when the winding component 1A shown in FIG. 1 is used as the smoothing choke coil 91 in the output smoothing circuit.

  The switching power supply device 80 is configured to include four switching elements 81 to 84, and a full bridge type bridge circuit that generates an input AC voltage based on a DC input voltage, a primary side winding 86, and a secondary side winding. A transformer 85 having lines 87 and 88, which transforms the input AC voltage to generate an output AC voltage, and diodes 89 and 90 which are provided on the secondary side of the transformer and are a plurality of rectifying elements. A full-wave rectifier circuit that rectifies the output AC voltage using the plurality of rectifier elements, a smoothing circuit having a smoothing choke coil 91 that converts the full-wave rectified pulse waveform into a direct current, and a capacitor 92 that is a capacitive element; A driving circuit for driving the bridge circuit, and connected between the output terminals.

  An outline of the operation of the circuit shown in FIG. 27 will be described below. First, the voltage of the high voltage battery 96 is applied to the input terminal 93, and the DC voltage is operated by PWM control, phase shift PWM control or the like using the switching elements 81 to 84, and is applied to the primary side winding 86 of the transformer 85. Applied as alternating current. The AC voltage applied to the primary side winding 86 is transmitted at a voltage corresponding to the ratio with the secondary side windings 87 and 88, is full-wave rectified by the diodes 89 and 90, and is applied to the smoothing choke coil 91 and the capacitive element. By a smoothing circuit having a capacitor 92, the direct current is led to the output terminal 94 as direct current. As a load connected to the output terminal 94, a low voltage battery 97 and auxiliary machinery 95 are connected. The control circuit 98 controls the voltage between the output terminals 94, performs the control as described above, and sends the drive signal to the switching elements 81 to 84 through the drive circuit 99 to perform the above operation. .

  The winding component 1A shown in FIG. 1 is regarded as the smoothing choke coil 91 in FIG. 27, and the end 12a of the first pattern 12 in the coil substrate 10 shown in FIG. 6 is the diode 89 in FIG. , 90 cathodes. Further, the connection portion 14a of the second pattern 14 on the coil substrate 10 is connected to one terminal of the capacitor 92 and the one input terminal of the control circuit 98 in FIG.

  Here, in the winding component 1A, as described above, heat dissipation can be improved and downsizing can be realized. Therefore, in the switching power supply device 80 provided with the winding component 1A as described above, it is possible to improve the heat dissipation and realize downsizing. Note that the same effect can be obtained even if the winding component 1A is replaced with the other winding components 1B to 1E.

  As mentioned above, although preferred embodiment of this invention was described, this invention is not limited to the said embodiment, It changed within the range which does not change the summary described in each claim, or applied to the other thing It may be a thing.

  For example, the coil substrate is not limited to a two-layer structure composed of a front surface and a back surface, and may be a multi-layer substrate such as four layers. When the coil substrate is a multilayer substrate, the number of turns can be increased. For example, the resistance value in a coil board | substrate can be lowered | hung by forming a conductor pattern in multiple layers and connecting these in parallel.

  In the coil winding 20B, a two-turn coil is integrally formed, but two coils may be formed separately for each turn. In this case, a connection portion corresponding to each coil winding is provided on the coil substrate.

  5A, 5B, 50A, 50B ... magnetic core, 10, 101 ... coil substrate, 11 ... conductor pattern, 20, 20B, 40 ... coil winding, 21, 41 ... coil part, 22, 23, 42, 43 ... terminal Part, 24, 25, 24A, 25A, 24B, 25B, 44 ... flat plate part, 26, 27, 28, 261, 271, 281, 262, 272, 282, 45, 46 ... bent part, 26a, 27a, 28a , 261a, 271a, 281a, 262a, 272a, 282a, 45a, 46a ... bent end, 26b, 27b, 28b, 261b, 271b, 281b, 262b, 272b, 282b, 45b, 46b ... bent plate part, 60 ˜66: heat transfer member, 70: housing (heat radiating member), 71: base, 71a: surface, 72: convex, 80: switching power supply, A: axis.

Claims (7)

A pair of magnetic cores facing each other;
A coil winding having a main portion formed of a plate-like conductive member extending in a direction intersecting the axis, and having a coil portion wound around the axis and terminal portions provided at both ends of the coil portion; ,
A heat dissipating member for releasing heat from the coil winding;
A heat transfer member disposed between the coil winding and the heat dissipation member;
A coil substrate provided with a conductor pattern wound around the axis;
With
The coil portion is sandwiched between the pair of magnetic cores and extends along the extending direction of the main surface, and the heat dissipation member from the flat plate portion at a position not overlapping the magnetic core in plan view A bent portion extending toward the side,
The heat transfer member contacts the heat radiating member and the bent portion ,
The coil winding is disposed between the coil substrate and the heat radiating member, and one terminal portion is electrically connected to one end of the conductor pattern and is wound around the axis together with the conductor pattern. Has been a winding part. The heat radiating member has a planar base portion and a convex portion protruding from the base portion,
The convex portion is disposed so as to be thermally connected to a region of the conductor pattern of the coil substrate that does not overlap the coil winding in plan view.
The winding component according to claim 1 . The bent portion has a bent end portion facing the surface of the base portion at an end portion thereof,
The heat transfer member is in contact with the surface of the base and the bent end.
The winding component according to claim 2 . The bent portion has a bent plate portion facing a surface facing the magnetic core in the convex portion,
The heat transfer member is in contact with the opposing surface and the bent plate portion;
The winding component according to claim 2 . A plurality of the bent portions are formed at positions facing each other across the magnetic core in the coil portion.
The winding component according to any one of claims 1 to 4 . The heat transfer member is disposed between the magnetic core and the coil winding.
The winding component according to any one of claims 1 to 5 . A power supply apparatus provided with the coil | winding components as described in any one of Claims 1-6 .

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