JP2016219612A - Electromagnetic induction equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic induction apparatus which can facilitate inspection during manufacturing, has high product reliability, is small, and can efficiently radiate heat from the winding and the core.SOLUTION: The electromagnetic induction device (transformer 100) of the present invention includes a core 14 forming a closed magnetic path, and a coil body 70 having a coil portion in which a plurality of metal members (plate-like metal members 18, 19) are connected by a printed wiring board 16. The coil portion has an insulating member 25 that insulates adjacent metal members from each other, and two end portions 18a, 18b (19a, 19b) of the metal member, which are inserted and connected to through holes 20 (22) of different element patterns, respectively, and the coil portion is circled around the core 14 by the number of metal members. The printed wiring board 16 is disposed at a position that does not contact the mounting surface of the cooler 17 on which the electromagnetic induction device is mounted.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electromagnetic induction device incorporated in, for example, a power converter.

  In power converters such as DCDC converters and chargers mounted on electric vehicles and hybrid vehicles, electromagnetic induction devices are mounted as passive components that perform voltage step-up and step-down operations. This electromagnetic induction device is a transformer, a reactor, a choke coil, or the like, and is used for storing or releasing energy or smoothing a direct current. Regarding such an electromagnetic induction device, a structure that can be miniaturized or efficiently dissipate heat generated during energization is very important.

  As an electromagnetic induction device for the purpose of downsizing, for example, Patent Document 1 discloses a power supply transformer. In the power transformer of Patent Document 1, a primary winding and a secondary winding are configured in a laminated structure, and the secondary winding is divided into at least two locations in the axial direction of the bobbin surrounding the core with an insulating member therebetween. It is wound.

  Regarding an electromagnetic induction device having excellent heat dissipation, for example, Patent Document 2 discloses a reactor. The reactor of patent document 2 stores a reactor main body in an aluminum case, and seals a reactor main body with the filling resin whose heat conductivity is 0.7-4.0 [W / m / K], Heat generated from the coil was efficiently radiated to the case and the cooler. Furthermore, the reactor of Patent Document 2 has a bobbin-less structure, so that heat generated from the core is also efficiently radiated.

  However, in the power transformer of Patent Document 1, since the winding is wound in a multilayer structure, with respect to the inner winding near the core, an insulator between the winding outside the winding and the winding is not provided. There was a problem that heat dissipation deteriorated by adding thermal resistance. Moreover, in the reactor of patent document 2, when a reactor was accommodated in a metal case and it was filled with thermal radiation resin, there existed a problem that the enlargement of a power converter device was forced.

  As an electromagnetic induction device that solves these problems, for example, a transformer shown in FIG. 38 can be considered. FIG. 38 is a perspective view of a transformer for explaining the problem, and FIG. 39 is a top view showing a wiring pattern of the metal base printed wiring board of FIG. The transformer 110 shown in FIG. 38 includes a metal-based printed wiring board 7 and a primary coil portion (primary winding) in which a plate-like metal member 5 for primary winding is wound a plurality of times via a wiring pattern 9; The secondary-side coil portion (secondary winding) in which the plate-like metal member 6 for the secondary winding is wound a plurality of times via the wiring pattern 11 is opposed to each layer of the plate-like metal members 5 and 6. A coil body, an insulating member 4 disposed between the plate-like metal members 5 and 6 that are opposed to each other, and a core 3 of a magnetic material that constitutes a closed magnetic circuit. The core 3 is divided into two core members 1 and 2. On the metal base printed wiring board 7, a wiring pattern 9 for primary winding and a wiring pattern 11 for secondary winding are arranged. The plate-like metal member 5 has an end portion connected to the connection portion 8 of the wiring pattern 9. Similarly, the end of the plate-like metal member 6 is connected to the connection portion 10 of the wiring pattern 11.

By connecting the plurality of plate-like metal members 5 to the connection portion 8 of the wiring pattern 9, a primary coil portion connected from the input 9a to the output 9b of the wiring pattern 9 is formed. Similarly, by connecting a plurality of plate-like metal members 6 to the connection portion 10 of the wiring pattern 11, a secondary coil portion connected from the input 11a to the output 11b of the wiring pattern 11 is formed. In the transformer 110, the metal base printed wiring board 7 is placed in contact with a cooler (not shown), so that the heat generated in the coil portions on the primary side and the secondary side is transferred to the plate-like metal members 5, 6 and wiring. It is possible to efficiently dissipate heat to the cooler through the patterns 9 and 11 and the metal base printed wiring board 7, and downsizing can be realized.

  Further, as shown in FIGS. 38 and 39, the transformer 110 has a configuration in which the plate-like metal members 5 and 6 of the primary winding and the secondary winding are alternately arranged. Since it is possible to achieve a low loss by reducing leakage magnetic flux, further miniaturization is possible.

JP 2010-183751 A (paragraphs 0067 to 0083, FIGS. 1 and 7) JP 2009-94328 A (paragraphs 0015, 0023 to 0027, FIG. 1)

  However, in the transformer 110, the wiring pattern 9 for the primary winding, the wiring pattern 11 for the secondary winding, the plate-shaped metal member 5 for the primary winding, and the secondary winding on the metal base printed wiring board 7 Since the plate metal members 5 and 6 are laminated so that the coil body connected to the plate metal member 6 for use has a predetermined inductance value, the laminated central portion (the frame in FIG. 111), it is extremely difficult to confirm from the surroundings at the connection points between the wiring patterns 9 and 11 and the end portions of the plate-like metal members 5 and 6, and inspection at the time of manufacture, for example, visual inspection Implementation is also difficult.

  In addition, the connection place between the plate-like metal members 5 and 6 and the wiring patterns 9 and 11 on the metal base printed wiring board 7 is on the cooler side. When the amount of generated heat is large, there is a large temperature difference before and after the connection portion, that is, the end portions of the plate-like metal members 5 and 6 and the wiring patterns 9 and 11. There was a problem of causing defects.

  An object of the present invention is to solve the above-described problems, which can be easily inspected during production, has high product reliability, is small, and dissipates heat from the winding and core. It aims at providing the electromagnetic induction apparatus which can be performed efficiently.

  The electromagnetic induction device of the present invention includes a core that forms a closed magnetic circuit, and a coil body that has a coil portion in which a plurality of metal members arranged so as to surround a part of the core are connected by a printed wiring board. The printed wiring board has a plurality of elementary patterns provided with through holes. The coil portion has an insulating member that insulates adjacent metal members from each other, and two end portions of the metal member are inserted and connected to through-holes of different elementary patterns, and the core wraps around the number of metal members. Is the body. A printed wiring board is arrange | positioned in the position which does not contact the mounting surface of the cooler by which the said electromagnetic induction apparatus is mounted.

  The electromagnetic induction device of the present invention has a plurality of metal members, and includes a coil body in which two end portions of the metal members are inserted and connected to through holes of the printed wiring board. It can be easily performed, has high product reliability, is small, and can efficiently dissipate the windings and the core.

It is a perspective view which shows the transformer by Embodiment 1 of this invention. It is a perspective view which shows the coil body of FIG. It is a top view which shows the wiring pattern and through hole in the printed wiring board surface layer of FIG. It is a perspective view which shows the core of FIG. It is a figure which shows the cross section of the core of FIG. 1, and a plate-shaped metal substrate. It is a front view which shows the plate-shaped metal member of FIG. It is a front view which shows the adjacent plate-shaped metal member of FIG. It is a front view which shows the insulating member of FIG. It is a front view which shows the plate-shaped metal member and insulating member of FIG. It is a perspective view which shows the transformer by Embodiment 2 of this invention. It is a perspective view which shows the coil body of FIG. It is a front view which shows the plate-shaped metal member of FIG. It is a front view which shows the adjacent plate-shaped metal member of FIG. It is a front view which shows the insulating member of FIG. It is a front view which shows the plate-shaped metal member and insulating member of FIG. It is a perspective view which shows the transformer by Embodiment 3 of this invention. It is a perspective view which shows the coil body of FIG. It is a front view which shows the coil body of FIG. It is a top view which shows the wiring pattern and through hole in the printed wiring board surface layer of FIG. It is a front view which shows the plate-shaped metal member of FIG. It is a front view which shows the adjacent plate-shaped metal member of FIG. It is a perspective view which shows the other trans | transformer by Embodiment 3 of this invention. It is a perspective view which shows the coil body by Embodiment 4 of this invention. It is a front view which shows the coil body of FIG. It is a top view which shows the wiring pattern and through hole in the printed wiring board surface layer of FIG. It is a front view which shows the plate-shaped metal member of FIG. It is a front view which shows the adjacent plate-shaped metal member of FIG. It is a perspective view which shows the coil body by Embodiment 5 of this invention. It is a front view which shows the plate-shaped metal member of FIG. It is a front view which shows an example of the edge part shape in the plate-shaped metal member of FIG. It is a front view which shows the other edge part shape in the plate-shaped metal member of FIG. FIG. 30 is a front view showing still another end shape of the plate-shaped metal member of FIG. 29. It is a perspective view which shows the coil body by Embodiment 6 of this invention. It is a front view which shows the plate-shaped metal member of FIG. It is a front view which shows an example of the edge part shape in the plate-shaped metal member of FIG. It is a front view which shows the other edge part shape in the plate-shaped metal member of FIG. It is a front view which shows the other edge part shape in the plate-shaped metal member of FIG. It is a perspective view of the transformer explaining the subject of the present invention. It is a top view which shows the wiring pattern of the metal base printed wiring board of FIG.

  Hereinafter, each embodiment of the present invention will be described. In each figure, the same or equivalent members and parts will be described with the same reference numerals.

Embodiment 1 FIG.
FIG. 1 is a perspective view showing a transformer according to Embodiment 1 of the present invention, and FIG. 2 is a perspective view showing a coil body of FIG. 3 is a top view showing wiring patterns and through holes in the surface layer of the printed wiring board of FIG. 1, and FIG. 4 is a perspective view showing the core of FIG. FIG. 5 is a view showing a cross section of the core of FIG. 1 and a plate-like metal substrate. 6 is a front view showing the plate-like metal member of FIG. 1, and FIG. 7 is a front view showing the adjacent plate-like metal member of FIG. 8 is a front view showing the insulating member of FIG. 1, and FIG. 9 is a front view showing the plate-like metal member and the insulating member of FIG. In FIGS. 1 and 2, components mounted on the printed wiring board 16 are omitted.

  The transformer 100, which is an electromagnetic induction device, includes a core 14 that is an outer iron type EE core, and plate-like metal members 18 and 2 for primary windings that are installed so as to surround the core middle leg portion 14a of the core 14. And a coil body 70 having a plate-like metal member 19 for the next winding. A core 14 that is an outer iron type EE type core (a core obtained by abutting two E-shaped core members) includes core members 12 and 13 that are magnetic materials such as ferrite. The coil body 70 insulates between the plate-like metal member 18 for the primary winding, the plate-like metal member 19 for the secondary winding, the plate-like metal member 18, the plate-like metal member 19, and the core 14. In addition, an insulating member 25 for holding the plate-like metal members 18 and 19, and a printed wiring board 16 provided with a wiring pattern 21 for primary winding and a wiring pattern 23 for secondary winding on the surface layer and the inner layer are provided. I have. The transformer 100 is disposed and fixed so that one surface of the laminated insulating member 25 is in contact with the cooler 17. The cooler 17 is a cooler in which a refrigerant circulates, for example. In the transformer 100 shown in FIG. 1, the printed wiring board 16 is disposed at a position where it does not contact the cooler 17, in this case, at a position farthest from the upper surface of the cooler 17. 2 is a perspective view as viewed in the direction A in FIG. 1, but the plate-like metal member 19 is arranged on the surface so that the arrangement of the plate-like metal member 19 can be easily understood.

  As shown in FIG. 4, the core 14 has two E-shaped core members 12 and 13 connected to each other by abutting three protrusions. The central projecting portion constitutes the core middle leg portion 14a, and the end-side projecting portion constitutes the core side leg portion 14b. Two core penetration parts 14c are formed between the core middle leg part 14a and the two core side leg parts 14b.

  The plate-like metal member 18 for primary winding is, for example, a copper material having a specified electric resistance value. The wiring pattern 21 for the primary winding of the printed wiring board 16 has a prescribed electrical resistance value, and the wiring pattern 21 has a through hole for the primary winding whose end is a semicircular slot. 20. The wiring pattern 21 includes an elementary pattern 21 c provided with one through hole 20 and an elementary pattern 21 d provided with two through holes 20. FIG. 3 shows the wiring pattern 21 having two elementary patterns 21c and 15 elementary patterns 21d. In addition, there may be a through hole to which the plate-like metal member 18 is not connected to the raw pattern 21c. The printed wiring board 16 is an insulating multilayer board such as a glass epoxy board, and the inner layer (not shown) is the same as the wiring pattern 21 for the primary winding in the surface layer portion shown in FIG. It has a simple wiring pattern. Further, the wiring pattern 21 for the primary winding is electrically connected to other circuits and electronic components through a connection portion (not shown).

  The two end portions 18a and 18b of the plate metal member 18 for primary winding penetrate through the through hole 20 for primary winding, respectively, and 2 in the plate metal member 18 for primary winding from the printed wiring board 16. The two end portions 18a and 18b are connected by being soldered in a protruding state. The plurality of primary winding plate-like metal members 18 and the wiring pattern 21 constitute a primary coil portion (primary winding) in which the plate-like metal member 18 is wound a plurality of times via the wiring pattern 21. Yes. One plate-like metal member 18 and the elementary pattern 21d of the wiring pattern 21 are elementary coils wound once, and the elementary coils are electrically connected to each other, and the core 14 of the core 14 shown in FIG. A primary winding is configured by being overlaid on the leg portions 14a by a specified number. In FIG. 5, the plate-like metal member 18 for the primary winding constituting the primary winding and the plate-like metal member 19 for the secondary winding constituting the secondary winding described later are included in the core of the core 14. The cross-sectional view arranged around the leg portion 14a is shown. The plate-like metal member 18 and the plate-like metal member 19 are disposed so as to pass through the core 14 core through-hole 14c.

  The plate-like metal member 19 for secondary winding will be described. The plate-like metal member 19 for the secondary winding is basically the same as the plate-like metal member 18 for the primary winding. The plate-like metal member 18 and the plate-like metal member 19 use the plate-like metal member 24 having the shape shown in FIG. 6 as a common component. The plate-like metal member 24 has a shape in which two end portions 24a and 24b are arranged at positions having asymmetry with respect to the central axis 24c. Further, as shown in FIG. 7, when the plate-like metal members 24 are alternately arranged as elementary coils for the primary winding and the secondary winding, between the end portions of the respective plate-like metal members 24 (center axis) A predetermined distance d3 is provided between the two end portions 24b on the 24c side.

  The plate-like metal member 19 for secondary winding is, for example, a copper material having a specified electric resistance value. The wiring pattern 23 for the secondary winding of the printed wiring board 16 has a prescribed electric resistance value, and the wiring pattern 23 has a semicircular elongated hole at the end. A through hole 22 is provided. The wiring pattern 23 has an elementary pattern 23 c provided with one through hole 22 and an elementary pattern 23 d provided with two through holes 22. In FIG. 3, the wiring pattern 23 having two elementary patterns 23c and 16 elementary patterns 23d is shown. In addition, there may be a through hole where the plate-like metal member 19 is not connected to the raw pattern 23c. The printed wiring board 16 is an insulating multilayer board such as a glass epoxy board as described above, and also for the secondary winding in the surface layer portion shown in FIG. 3 in the board inner layer (not shown). A wiring pattern similar to the wiring pattern 23 is provided. Further, the wiring pattern 23 for the secondary winding is electrically connected to other circuits and electronic components through a connection portion (not shown).

  The two end portions 19a and 19b of the plate metal member 19 for the secondary winding respectively penetrate the through holes 22 for the secondary winding, and the plate metal member for the secondary winding from the printed wiring board 16 The two end portions 19a and 19b in 19 are connected by being soldered in a protruding state. The plurality of plate-like metal members 19 for the secondary winding and the wiring pattern 23 include a secondary coil portion (secondary winding) in which the plate-like metal member 19 is wound a plurality of times through the wiring pattern 23. It is composed. One plate-shaped metal member 19 and the elementary pattern 23d of the wiring pattern 23 are elementary coils wound once, and these elementary coils are electrically connected to each other and are in the core of the core 14 shown in FIG. A secondary winding is configured by overlapping a predetermined number of legs 14a. As shown in FIG. 5, the plate-like metal member 18 for the primary winding constituting the primary winding and the plate-like metal member 19 for the secondary winding constituting the secondary winding are the core of the core 14. The periphery of the middle leg portion 14a is wound around and arranged. The plate-like metal member 18 and the plate-like metal member 19 are disposed so as to pass through the core 14 core through-hole 14c.

  In this embodiment, as shown in FIG. 5 and FIG. 7, the plate metal member 18 for the primary winding and the plate metal member 19 for the secondary winding are alternately arranged. The through hole 20 of the wiring pattern 21 and the through hole 22 of the wiring pattern 23 for the secondary winding are shifted by a distance d1 as shown in FIG. Next, an insulation distance between the adjacent wiring pattern 21 for the primary winding and the wiring pattern 23 for the secondary winding is considered. 3 indicates the position of the plate-shaped metal member 18 connected to the wiring pattern 21, and the broken line C indicates the position of the plate-shaped metal member 19 connected to the wiring pattern 23. The distance between the left through hole 22 connected to the right through hole 22 overlapping the broken line C and the right through hole 20 overlapping the broken line B is d2. As shown in FIG. 3, a predetermined distance d2 is provided in order to secure an insulation distance between the adjacent wiring pattern 21 for the primary winding and the wiring pattern 23 for the secondary winding. By connecting the plate-like metal member 18 to the through hole 20 of the wiring pattern 21 via solder, a primary coil portion connected from the input 21a to the output 21b of the wiring pattern 21 is formed. Similarly, by connecting the plate-like metal member 19 to the through hole 22 of the wiring pattern 23 via solder, a secondary coil portion connected from the input 23a to the output 23b of the wiring pattern 23 is formed.

  8 and 9 is a resin member obtained by molding a resin material such as PPS. The insulating member 25 has a through hole 25d in which the core middle leg portion 14a of the core 14 is disposed. In addition, the insulating member 25 is provided with a concave portion 25a formed by digging the thickness of the plate-like metal member 24 in a shape similar to that of the plate-like metal member 24 at a location where the insulating member 25 contacts the plate-like metal member 24. Yes. The plate-like metal member 24 is disposed so that the end portions 24a and 24b extend outward from the openings 25b and 25c, respectively, and fit into the recess 25a of the insulating member 25, that is, engage with each other. Since the insulating member 25 in FIGS. 8 and 9 corresponds to the plate-like metal member 19, the recesses 25 a and the openings 25 b and 25 c in the insulating member 25 in FIGS. 8 and 9 correspond to the plate-like metal member 19. Arrangement. The arrangement of the recesses 25a and the openings 25b and 25c corresponding to the plate-like metal member 18 is an arrangement in which the left and right sides are reversed in FIGS.

  In the transformer 100 of the first embodiment configured as described above, the end portions 18a and 18b of the plate metal member 18 for primary winding and the end portions 19a and 19b of the plate metal member 19 for secondary winding are provided. Are inserted into the through holes 20 and 22 in the printed wiring board 16, and the plate-like metal members 18 and 19 are joined to the wiring pattern 21 for the primary winding and the wiring pattern 23 for the secondary winding, respectively, by soldering. ing. In the transformer 100 according to the first embodiment, the printed wiring board 16 is disposed at a position away from the cooler 17, and the joint portions between the plate-like metal members 18 and 19 and the printed wiring board 16, that is, the through holes 20 and 22 are disposed. Since the formed part is arrange | positioned at the outer peripheral side of the coil body 70, the state of a junction part can be confirmed easily from the outside, and the visual inspection in the case of manufacture can also be implemented easily.

  Further, in the transformer 100 of the first embodiment, the ends 18a and 18b of the plate-like metal member 18 for primary winding and the ends 19a and 19b of the plate-like metal member 19 for secondary winding are printed wiring. By projecting from the plate 16, it is possible to easily confirm the formation state of a solder fillet portion (not shown) at the joint portion formed between the plate-like metal members 18 and 19 and the printed wiring board 16. Furthermore, visual inspection of the solder fillet portion can be easily performed.

  Further, in the transformer 100 of the first embodiment, the end portions 18a and 18b of the plate-shaped metal member 18 for primary winding and the end portions 19a and 19b of the plate-shaped metal member 19 for secondary winding are connected. Since the printed wiring board 16 is arranged on the surface not in contact with the cooler 17, before and after the joint between the wiring patterns 21 and 22 and the plate-like metal members 18 and 19 in the printed wiring board 16, That is, the temperature difference between the end portions of the plate-like metal members 18 and 19 and the wiring patterns 21 and 23 can be suppressed. For this reason, since the transformer 100 of the first embodiment can suppress the bonding failure caused by the thermal stress at the bonding portion between the wiring patterns 21 and 23 and the plate-like metal members 18 and 19, the product reliability is improved. Can be increased.

  Further, since the plate-like metal member 18 for the primary winding and the plate-like metal member 19 for the secondary winding are members formed in a plate shape, the winding cross-sectional areas of the primary winding and the secondary winding Therefore, the transformer 100 according to the first embodiment can suppress loss generated in the primary element coil and the secondary element coil, and can reduce the thermal resistance between the element coils. That is, it is excellent in heat dissipation. In addition, since the plate-like metal members 18 and 19 are manufactured by punching a sheet metal roll material using a punching die, the dimensional accuracy can be stabilized. For this reason, since the transformer 100 according to the first embodiment uses the plate-like metal members 18 and 19 with stable dimensional accuracy, variation in leakage inductance can be suppressed, and loss variation in the primary winding and the secondary winding can be suppressed. be able to. Moreover, the transformer 100 according to the first embodiment can also suppress variations in heat dissipation.

  Further, the primary winding plate metal member 18 and the secondary winding plate metal member 19 are connected to the through-holes 20 and 22 for each turn, that is, for each elementary coil. It is possible to stabilize the dimensional accuracy of the distance between the coil and the secondary winding, and the transformer 100 according to the first embodiment can reduce variations in electrical characteristics such as heat dissipation, leakage inductance, and loss.

  Further, when the printed wiring board 16 is constituted by a multilayer substrate having insulation properties such as a glass epoxy substrate, the wiring patterns 21 and 22 can be laminated, and the pattern thickness can be increased. The transformer 100 according to the first embodiment can reduce the amount of heat loss in the wiring portions of the wiring patterns 21 and 22 in the primary winding and the secondary winding.

  Further, since the plate-like metal member 18 for the primary winding and the plate-like metal member 19 for the secondary winding are made of a copper material, for example, a tough pitch copper material, conductivity close to that of pure copper can be obtained. The transformer 100 of 1 can realize a low electrical resistance value and high heat dissipation as a primary winding and a secondary winding. Further, since the tough pitch copper material is a nonmagnetic metal, the transformer 100 according to the first embodiment can reduce the generation of eddy currents and the eddy current loss due to the leakage magnetic flux generated by itself.

  Further, the transformer 100 of the first embodiment can realize a transformer with a high degree of coupling by alternately arranging the plate-like metal member 18 for the primary winding and the plate-like metal member 19 for the secondary winding, Leakage inductance can be suppressed. For this reason, since the transformer 100 of the first embodiment can have a very small leakage inductance, it is possible to improve the high frequency characteristics when the switching circuit is driven at a high frequency, and the high frequency loss in the primary winding and the secondary winding. Can be suppressed. Since the transformer 100 according to the first embodiment has a configuration in which the plate-like metal members 18 and 19 of the primary winding and the secondary winding are alternately arranged, a transformer with a high degree of coupling can be realized, and leakage flux can be reduced. Since the loss can be reduced by the reduction, the size can be reduced as compared with the transformer of Patent Document 1.

  Further, the plate-like metal member 18 for the primary winding and the plate-like metal member 19 for the secondary winding commonly use the plate-like metal member 24 shown in FIG. By forming the portions 18a, 18b and 19a, 19b to be asymmetric with respect to the central axis, the transformer 100 according to the first embodiment includes the plate-shaped metal member 18 for the primary winding, the secondary winding When the plate-like metal members 19 are alternately arranged, the distance (space) between the plate-like metal member 18 for the primary winding and the end 18b and the end 19b of the plate-like metal member 19 for the secondary winding A distance d3 is formed, and insulation can be ensured for a predetermined voltage applied to the transformer. In addition, the transformer 100 according to the first embodiment can be configured so that the plate-like metal member 18 for the primary winding and the plate-like metal member 19 for the secondary winding can be configured by the common plate-like metal member 24. Reduction is possible.

  Further, in the insulating member 25 arranged between the plate-like metal member 18 for the primary winding and the plate-like metal member 19 for the secondary winding, a recess 25a is formed at a location where the plate-like metal members 18 and 19 are contacted. Since the plate-like metal members 18 and 19 are housed in the recess 25a of the insulating member 25, the transformer 100 according to the first embodiment has the plate-like metal member 18 for the primary winding and the plate-like metal member 18 for the secondary winding. Ensuring insulation between the plate-like metal member 19, between the plate-like metal member 18 for the primary winding and the core 14, and between the plate-like metal member 19 for the secondary winding and the core 14. Can do. Thereby, since the transformer 100 according to the first embodiment can ensure insulation between the plate-like metal members 18 and 19 and the core 14, the performance as a transformer can be stabilized. Further, the transformer 100 according to the first embodiment can hold the plate-like metal member 18 for the primary winding and the plate-like metal member 19 for the secondary winding in the recess 25a, and space efficiency is improved. By increasing the size, it becomes possible to reduce the size of the transformer. Since the transformer 100 of the first embodiment is small in size, the assemblability can be further improved.

  A plurality of plate-like metal members 18 for primary windings and a plurality of plate-like metal members 19 for secondary windings are formed as parts that are insert-molded simultaneously when the insulating member 25 is integrally formed. You may do it. When the plate-shaped metal members 18 and 19 are insert-molded, it is easy to ensure insulation. When a component is formed by insert molding, the transformer 100 according to the first embodiment can secure vibration resistance and strength as a transformer by adding a holding structure for the cooler 17 (not shown). This is possible, and it is not necessary to dispose individual insulating members 25 between the plate-like metal member 18 for the primary winding and the plate-like metal member 19 for the secondary winding. Reduction and improvement of assembly workability can also be realized.

  Further, by providing a distance d2 that can be insulated between the wiring pattern 21 for the primary winding and the wiring pattern 23 for the secondary winding that are adjacent to each other with respect to a predetermined voltage applied to the transformer. In the transformer 100 according to the first aspect, insulation between the primary winding and the secondary winding is ensured, and the performance as the transformer can be stabilized.

  Further, the transformer 100 according to the first embodiment is configured so that the shape of the through hole 20 for the primary winding and the through hole 22 for the secondary winding in the printed wiring board 16 is a long hole. Since the cross-sectional area at the end portions 18a, 18b, 19a, 19b of the plate-like metal member 18 and the plate-like metal member 19 for secondary winding is not reduced, it is possible to suppress the electric resistance value and ensure heat dissipation Become. Further, in the case where the through holes 20 and 22 are constituted by round holes, the waste areas of the through holes 20 and 22 with respect to the plate metal member (the end portions 18a, 18b, 19a and 19b of the plate metal members 18 and 19 and the gap space). However, in the transformer 100 of the first embodiment, since the through holes 20 and 22 are long holes, the space efficiency of the through holes 20 and 22 is improved, and the printed wiring board 16 can be reduced in size. For this reason, since the transformer 100 of the first embodiment can reduce the printed wiring board 16, the transformer (the entire apparatus) can be reduced in size, weight, and cost accordingly. Further, by making the ends of the elongated holes in the through holes 20 and 22 into a semicircular shape, workability in drilling the through holes at the time of manufacture is good.

  The transformer 100 according to the first embodiment is configured so that one surface of the insulating member 25 that contacts the plate-like metal member 18 for the primary winding and the plate-like metal member 19 for the secondary winding contacts the cooler 17. Since it is disposed and fixed, it is possible to dissipate heat generated in the primary winding and the secondary winding via the insulating member. In FIG. 1, the surface of the insulating member 25 brought into contact with the cooler 17 is a surface opposite to the surface on which the printed wiring board 16 is disposed in the coil body 70. In addition, in order to further improve the heat dissipation, it is possible to change the material of the insulating member 25 to a material of high thermal conductivity grade.

  Further, a junction between the plate-like metal member 18 for the primary winding and the plate-like metal member 19 for the secondary winding in the printed wiring board 16 that is not arranged on the cooling surface of the cooler 17, that is, a plate The end portions 18a, 18b, 19a, and 19b of the metal members 18 and 19 may be supplementarily cooled by blowing air from the outside with a fan or the like.

  Further, a metal heat radiating plate (not shown) is mounted on the top of the cooler 17 facing the cooling surface side of the core 14 (the lower side of the core 14 in FIG. 1), and the cooling surface side of the core 14 is connected to the metal heat radiating plate. You may make it contact directly via heat dissipation members, such as grease and a sheet | seat. By doing in this way, the transformer 100 of Embodiment 1 can efficiently radiate the heat generated from the core 14 to the cooler 17 through the metal heat radiating plate.

  Further, in the case where the cooler 17 is an aluminum die cast manufactured by casting an aluminum material, the cooler 17 has a pedestal (on the side of the cooler 17 (the lower side of the core 14 in FIG. 1)). (Not shown), and the aluminum pedestal and the core 14 may be brought into contact with each other directly or through a heat radiating member such as grease or a sheet. By doing in this way, the transformer 100 according to the first embodiment can efficiently radiate the heat of the core 14 and can also reduce the metal heat radiation plate. Therefore, in this case, it is possible to reduce the metal heat dissipation plate, so that the transformer 100 of the first embodiment can reduce the number of parts of the transformer and reduce the cost of the transformer.

  Further, as described above, the heat dissipation of the core 14 is improved by mounting a metal heat dissipating plate on the top of the cooler 17 or by providing a base on the cooler 17, so that the transformer 100 of the first embodiment is The heat dissipation area of the core 14 and the volume of the core 14 can be reduced. For this reason, the transformer 100 of the first embodiment can reduce the volume of the transformer as the core 14 is reduced in size, and the members constituting the transformer can be reduced in size and weight. The transformer 100 according to the first embodiment can be reduced in cost as the members constituting the transformer are reduced in size and weight.

  In this embodiment, the temperature difference between the front and back of the joint between the plate-like metal members 18 and 19 and the printed wiring board 16, that is, the end portions of the plate-like metal members 18 and 19 and the wiring patterns 21 and 23 is suppressed. In addition, an example has been described in which the printed wiring board 16 is configured without being brought into contact with the cooler 17 in order to suppress poor bonding due to thermal stress. However, when the amount of heat loss in the primary and secondary windings is small and the temperature difference before and after the joint is small, or when there is no concern about poor contact at the solder joint due to factors such as a small number of thermal cycles as a transformer It is also possible to constitute a transformer in which the printed wiring board 16 is placed in contact with the cooler 17. When the printed wiring board 16 is placed in contact with the cooler 17, the end portions 18a, 18b, 19a, 19b of the plate-like metal members 18, 19 protruding from the printed wiring board 16 are insulated heat-radiating sheets (not shown). It is good also as a structure which heats to the cooler 17 via this sheet. The insulating heat dissipation sheet is a sheet that also serves as an insulating sheet and a heat dissipation sheet. Even in this case, before the printed wiring board 16 is mounted on the cooler 17, the state of the joint between the end portions 18a, 18b, 19a, 19b of the plate-like metal members 18, 19 and the through holes 20, 22 is easily achieved. It can be confirmed, and visual inspection at the time of manufacture can be easily performed.

  Further, when the printed wiring board 16 is mounted on the surface of the cooler 17, the end portions 18 a, 18 b, 19 a, 19 b of the plate-like metal members 18, 19 are protruded from the through holes 20, 22 in the printed wiring board 16. The through holes 20, 22 and the plate-like metal members 18, 19 may be joined so that the end portions 18a, 18b, 19a, 19b coincide with the end faces on the outer peripheral side of the through holes 20, 22. The end portions 18a, 18b, 19a, 19b may be joined inside the through holes 20, 22. In this case, since the contact with the insulating heat radiation sheet is facilitated on the entire surface of the printed wiring board 16 and the heat radiation area to the cooler 17 can be increased, the transformer of the first embodiment configured in this way is used. 100 improves heat dissipation. Moreover, since the transformer 100 of the first embodiment configured as described above can easily fix the printed wiring board 16 to the cooler 17, the strength and vibration resistance of the transformer as a whole can be improved.

  Moreover, the structure which isolate | separates an insulation heat radiation sheet into an insulation member and a heat radiation member, for example, a structure which affixes an insulation tape (insulation member) on the surface of the cooler 17, and arrange | positions a heat radiation grease or a heat radiation sheet on the upper part of an insulation tape is also possible. Is possible. In addition, the primary winding, the secondary winding, the core 14, or the entire transformer is completely or partially sealed with a potting material having thermal conductivity and insulation so that heat is dissipated while ensuring insulation. But you can.

  Further, in this embodiment, the glass epoxy board is used as the printed wiring board 16 which is a constituent element of the primary winding and the secondary winding, but it is a ceramic base printed wiring board or a metal base printed wiring board. May be.

  In this embodiment, the step-up transformer is described as having a higher number of turns of the secondary winding than the primary winding. However, the step-down transformer having a higher number of turns of the primary winding than the secondary winding is also described. The invention is adaptable. In addition, this transformer has one secondary output, but the present invention can be applied even to a multi-output type composite transformer.

  Further, in this embodiment, the core 14 has been described as an EE type core that is an outer iron type, but an outer iron type core such as an EI type, an EER type, an ER type, a PQ type, an I type, or a U type, etc. The present invention can also be applied to an inner iron core.

  In this embodiment, a copper-based material is used for the plate-like metal members 18 and 19, but the present invention can be applied to an aluminum-based material that is non-magnetic and is a metal material. In this embodiment, a transformer has been described as an electromagnetic induction device. However, a reactor or a choke coil may be used. Further, as an example of the cooling means (cooling device) for cooling the electromagnetic induction device, the cooler 17 in which the refrigerant circulates has been described, but a heat sink may be used.

  As described above, the electromagnetic induction device (transformer 100) according to the first embodiment includes the core 14 constituting the closed magnetic circuit and a plurality of metal members (plate-like metal members 18) arranged so as to surround a part of the core 14. 19) includes a coil body 70 having a coil portion connected by a printed wiring board 16. The printed wiring board 16 has a plurality of elementary patterns 21c and 21d (23c and 23d) provided with through holes 20 (22). The coil portion has an insulating member 25 that insulates adjacent metal members (plate-like metal members 18, 19) from each other, and two end portions 18a, 18b (19a, 19a, 19) of the metal members (plate-like metal members 18, 19). 19b) is a structure that is inserted and connected to through-holes 20 (22) of different elementary patterns, and that wraps around the core 14 by the number of metal members (plate-like metal members 18, 19). The printed wiring board 16 is disposed at a position that does not contact the mounting surface of the cooler 17 on which the electromagnetic induction device is mounted. The electromagnetic induction device of the first embodiment has a plurality of metal members (plate-like metal members 18, 19), and two end portions 18a, 18b (19a, 19b) of the metal members (plate-like metal members 18, 19). ) Includes the coil body 70 inserted and connected to the through-hole 20 (22) of the printed wiring board 16, so that it can be easily inspected during manufacture, has high product reliability, is small, and is wound. And heat dissipation of the core can be performed efficiently.

  Transformer 100 of Embodiment 1 is a plate-like metal member in which metal members (plate-like metal members 18 and 19) are formed in a plate shape. Coil body 70 includes two coil portions, and one coil This is a transformer in which a part is a primary coil (primary winding) and the other coil part is a secondary coil (secondary winding). The transformer 100 according to the first embodiment includes a plurality of metal members (plate-like metal members 18 and 19), and two end portions 18a and 18b (19a and 19b) of the metal members (plate-like metal members 18 and 19). Is provided with the coil body 70 inserted into and connected to the through hole 20 (22) of the printed wiring board 16, so that the inspection during the manufacturing can be facilitated, the product reliability is high, the size is small, and the winding and The core can be efficiently dissipated. Moreover, the reactor of Embodiment 1 is a plate-shaped metal member in which the metal member (plate-shaped metal member 18) is formed in a plate shape, and the coil body 70 is a reactor having one coil portion. The reactor according to the first embodiment has a plurality of metal members (plate-like metal members 18), and two end portions 18a and 18b of the metal members (plate-like metal members 18) are formed in the through holes 20 of the printed wiring board 16. Since the coil body 70 inserted and connected is provided, inspection at the time of manufacture can be facilitated, the product reliability is high, the size is small, and the heat radiation of the winding and the core can be performed efficiently.

Embodiment 2. FIG.
10 is a perspective view showing a transformer according to the second embodiment of the present invention, and FIG. 11 is a perspective view showing the coil body of FIG. 12 is a front view showing the plate-like metal member of FIG. 10, and FIG. 13 is a front view showing the adjacent plate-like metal member of FIG. 14 is a front view showing the insulating member of FIG. 10, and FIG. 15 is a front view showing the plate-like metal member and the insulating member of FIG. The transformer 100 according to the second embodiment includes a coil body 70 having a plate metal member 32 for primary winding provided with a protrusion 32d and a plate metal member 34 for secondary winding provided with a protrusion 34d. Is different from the transformer 100 of the first embodiment in that In FIG. 10 and FIG. 11, components mounted on the printed wiring board 16 are omitted.

  As shown in FIGS. 10 and 11, the transformer 100 of the second embodiment is configured to efficiently dissipate heat generated from the primary winding and the secondary winding to the cooler 17. Specifically, the primary winding projection 32d and the secondary winding projection 32d extending from the plate metal member 32 for the primary winding and the plate metal member 34 for the secondary winding to the arrangement side of the cooler 17, respectively. A projection 34 d for the next winding is provided, and the projections 32 d and 34 d are brought into contact with the insulating heat radiation sheet 103 disposed on the cooler 17. The coil body 70 of the second embodiment includes a plate-like metal member 32 for primary winding, a plate-like metal member 34 for secondary winding, a plate-like metal member 32, a plate-like metal member 34, and a core 14. And an insulating member 29 that holds the plate-like metal members 32 and 34 and the printed wiring board 16. FIG. 11 is a perspective view as viewed in the direction A in FIG. 10. In FIG. 11, the plate-like metal member 34 is arranged on the surface so that the arrangement of the plate-like metal member 34 can be easily understood.

  The two end portions 32a and 32b of the plate metal member 32 for primary winding respectively penetrate the through hole 20 of the printed wiring board 16, and 2 in the plate metal member 32 for primary winding from the printed wiring board 16. The two ends 32a and 32b are connected by being soldered in a protruding state. Similarly, the two end portions 34a and 34b of the plate-like metal member 34 for the secondary winding penetrate through the through holes 22 of the printed wiring board 16, respectively. The two end portions 34a and 34b of the metal member 34 are connected by being soldered in a protruding state.

  The plate-like metal member 32 for the primary winding and the plate-like metal member 34 for the secondary winding are, for example, a copper material having a prescribed electric resistance value as in the first embodiment. The plate metal member 32 for the primary winding provided with the protrusion 32d and the plate metal member 34 for the secondary winding provided with the protrusion 34d are the plates provided with the protrusions 36d shown in FIGS. The metal member 36 is used as a common part. Also in the plate-like metal member 36, the end portions 36a and 36b and the protrusion portion 36d are formed in a shape having asymmetry with respect to the central axis 36c, so that the primary winding and the secondary winding as shown in FIG. When the plate-like metal members 36 which are the constituent elements of FIG. 6 are alternately arranged, a space of distance d4 and distance d5 is formed between the two plate-like metal members. The distance d4 corresponds to the distance between the end 32b of the plate-like metal member 32 for primary winding and the end 34b of the plate-like metal member 34 for secondary winding. The distance d5 corresponds to the distance between the protrusion 32d of the plate metal member 32 for primary winding and the protrusion 34d of the plate metal member 34 for secondary winding.

  14 and 15 is a resin member obtained by molding a resin material such as PPS. The insulating member 29 has a through hole 29e in which the core middle leg portion 14a of the core 14 is disposed. Further, the insulating member 29 is provided with a recess 29a formed by digging the thickness of the plate-like metal member 36 in a shape similar to that of the plate-like metal member 36 at a location where the insulation member 29 contacts the plate-like metal member 36. Yes. The plate-like metal member 36 is arranged so that the end portions 36a and 36b and the projection portion 36d extend outward from the openings 29b, 29c and 29d, respectively, and fit into the recess 29a of the insulating member 29, that is, engage with each other. Has been. 14 and 15 corresponds to the plate-like metal member 34. Therefore, the recess 29a and the openings 29b, 29c, and 29d in the insulation member 29 of FIGS. Corresponding arrangement. The arrangement of the recesses 29a and the openings 29b, 29c, 29d corresponding to the plate-like metal member 32 is an arrangement in which the left and right sides are reversed in FIGS.

  By configuring in this way, the transformer 100 of the second embodiment has the same effects as those of the first embodiment. Further, the transformer 100 according to the second embodiment dissipates the heat loss generated from the primary winding and the secondary winding from the protrusions 34d and 36d to the cooler 17 via the insulating heat dissipation sheet 103. Therefore, the cooler 17 Can be radiated more efficiently than in the first embodiment. Further, the transformer 100 of the second embodiment radiates the plate metal member 32 for the primary winding and the plate metal member 34 for the secondary winding to the cooler 17 via the insulating heat radiation sheet 103 one by one. Therefore, the heat dissipation performance can be further improved.

  In addition, the transformer 100 of the second embodiment can reduce the projected area of the primary winding and the secondary winding by improving heat dissipation, and can reduce the volume of the primary winding, the secondary winding, and the transformer. Can do. Therefore, the transformer 100 according to the second embodiment can reduce the size and weight of the members constituting the transformer and reduce the costs associated therewith. In addition, the transformer 100 according to the second embodiment provides insulation between the primary winding and the secondary winding by providing a space of the distance d4 and the distance d5 between the plate-like metal member 32 and the plate-like metal member 34. Can be secured, and the performance as a transformer can be stabilized. Further, in the transformer 100 of the second embodiment, the end portions 32a and 32b and the protruding portion 32d of the plate-like metal member 32 and the end portions 34a and 34b and the protruding portion 34d of the plate-like metal member 34 extend to the outside. Since the plate-like metal members 32 and 34 are disposed so as to fit in the recess 29a of the insulating member 29, the insulating member 29 can be configured without increasing its thickness.

Embodiment 3 FIG.
16 is a perspective view showing a transformer according to Embodiment 3 of the present invention, and FIG. 17 is a perspective view showing a coil body of FIG. FIG. 18 is a front view showing the coil body of FIG. 19 is a top view showing wiring patterns and through holes in the surface layer of the printed wiring board of FIG. 20 is a front view showing the plate-like metal member of FIG. 16, and FIG. 21 is a front view showing the adjacent plate-like metal member of FIG. In FIG. 16 and FIG. 17, circuits, components, and the like mounted on the printed wiring boards 41 and 42 are omitted.

  The transformer 100 according to the third embodiment, which is an electromagnetic induction device, includes a coil body in which a primary winding printed wiring board 41 and a secondary winding printed wiring board 42 are arranged on the primary winding and the secondary winding, respectively. 70, and the printed wiring board 41 for the primary winding and the printed wiring board 42 for the secondary winding are not in contact with the cooler 17 and are arranged in a symmetrical positional relationship. The coil body 70 of the third embodiment includes a plate-like metal member 45 for primary winding, a plate-like metal member 46 for secondary winding, a plate-like metal member 45, a plate-like metal member 46, and a core 14. And an insulating member 43 that holds the plate-like metal members 45 and 46, and printed wiring boards 41 and 42 having wiring patterns 50 on the surface layer and the inner layer. FIG. 17 is a perspective view as viewed in the direction A in FIG. 16, but the plate-like metal member 46 is arranged on the surface so that the arrangement of the plate-like metal member 46 can be easily understood.

  The plate-like metal member 45 for primary winding is provided with end portions 45a and 45b connected to the printed wiring board 41, and a projection portion 45d for winding heat dissipation is provided as in the second embodiment. . Further, the plate-like metal member 46 for the secondary winding is provided with end portions 46a and 46b connected to the printed wiring board 42, and a projection portion 46d for winding heat dissipation is provided as in the second embodiment. It has been. In the transformer 100 according to the third embodiment, the primary winding printed wiring board 41 and the secondary winding printed wiring board 42 are disposed at a position where they are not in contact with the cooler 17, and the primary winding. The protrusion 45 d for the secondary winding and the protrusion 46 d for the secondary winding are fixed to the cooler 17 so as to be in contact with the insulating heat radiation sheet 103 disposed on the cooler 17.

  FIG. 19 schematically shows the wiring pattern 50 and the through hole 49 arranged on the surface layer of the printed wiring boards 41 and 42 constituting the primary winding and the secondary winding. The wiring pattern 50 has an elementary pattern 50 c provided with one through hole 49 and an elementary pattern 50 d provided with two through holes 49. FIG. 19 shows a wiring pattern 50 having two elementary patterns 50c and 15 elementary patterns 50d. In addition, there may be a through hole in which the plate-like metal members 45 and 46 are not connected to the raw pattern 50c. A wiring pattern 50 for primary winding is disposed on the printed wiring board 41 in the present embodiment, and a wiring pattern 50 for secondary winding is disposed on the printed wiring board 42 in the present embodiment. A plate metal member 45 for primary winding is joined to the printed wiring board 41 for primary winding, and a plate metal member 46 for secondary winding is joined to the printed wiring board 42 for secondary winding. Is done. In the case of a step-up transformer, the number of turns of the wiring pattern 50 for the secondary winding is larger than that of the wiring pattern 50 for the primary winding, that is, the number of the elementary patterns 50d for the secondary winding is the primary winding. More than the number of element patterns 50d for use. In the case of a step-down transformer, the number of turns of the wiring pattern 50 for the primary winding is larger than that of the wiring pattern 50 for the secondary winding, that is, the number of primary patterns 50d for the primary winding is the secondary winding. More than the number of element patterns 50d for use. The printed wiring boards 41 and 42 and the plate-like metal members 45 and 46 are joined as follows.

  The two end portions 45a and 45b of the plate metal member 45 for the primary winding penetrate the through holes 49 of the printed wiring board 41, respectively, and 2 in the plate metal member 45 for the primary winding from the printed wiring board 41. The two end portions 45a and 45b are connected by being soldered in a protruding state. Similarly, the two end portions 46a and 46b of the plate-like metal member 46 for the secondary winding penetrate the through holes 49 of the printed wiring board 42, respectively, and the plate-like shape for the secondary winding from the printed wiring board 42. The two end portions 46a and 46b of the metal member 46 are connected by being soldered in a protruding state.

  The plate-like metal member 45 for the primary winding and the plate-like metal member 46 for the secondary winding are, for example, a copper material having a prescribed electric resistance value as in the first embodiment. The plate metal member 45 for the primary winding provided with the projection 45d and the plate metal member 46 for the secondary winding provided with the projection 46d are the plates provided with the projection 51d shown in FIGS. The metal member 51 is used as a common part. The end portions 51a and 51b of the plate-like metal member 51 are formed so as to be symmetrical with respect to the central axis 51c.

  By connecting the plate-like metal member 45 to the through-hole 49 of the wiring pattern 50 in the printed wiring board 41 via solder, the primary coil portion connected from the input 50a to the output 50b of the wiring pattern 50, that is, a plate-like shape. A primary winding in which the metal member 45 is wound a plurality of times through the wiring pattern 50 is formed. Similarly, the secondary coil portion connected from the input 50a to the output 50b of the wiring pattern 50 by connecting the plate-like metal member 46 to the through hole 49 of the wiring pattern 50 in the printed wiring board 42 via solder. That is, a secondary winding in which the plate-like metal member 46 is wound a plurality of times through the wiring pattern 50 is formed. The insulating member 43 is a resin member obtained by molding a resin material such as PPS. The insulating member 43 has a through hole 43a in which the core middle leg portion 14a of the core 14 is disposed. In addition, the insulating member 43 is provided with a recess formed by digging the thickness of the plate-like metal member 51 in a shape similar to that of the plate-like metal member 51 at a location where the insulating member 43 contacts the plate-like metal member 51. . The plate-like metal member 51 extends so that the end portions 51a and 51b and the protruding portion 51d extend from the three openings provided on the outer peripheral portion, and fits into the recessed portion of the insulating member 43, that is, engages. Has been placed. The concave portion of the insulating member 43 corresponds to the concave portion 29a in FIG. The three openings of the insulating member 43 correspond to the openings 29b, 29c, and 29d in FIG.

  As shown in FIGS. 17, 18, and 21, the plate-like metal member 45 for the primary winding and the plate-like metal member 46 for the secondary winding are alternately arranged. The primary side coil part and the secondary side coil part insulated from each other by interposing the insulating member 43 are laminated so as to be alternately inserted for each elementary coil wound once. 21 indicates a hidden outer peripheral portion of the plate-like metal member 51 arranged on the lower side. The coil body 70 is configured as a coil body in which primary coil portions (primary windings) and secondary coil portions (secondary windings) are alternately arranged. The plate-like metal member 51 which is a common part of the plate-like metal member 45 for the primary winding and the plate-like metal member 46 for the secondary winding has positions of the end portions 51 a and 51 b in order to form the coil body 70. 21 in the extended portion (the portion surrounded by the broken lines 104 and 105 in FIG. 20) where the end portions 51a and 51b extend as shown in FIG. Except for the tip portions of the end portions 51a and 51b, all the regions are formed to overlap each other. In this way, when the two plate-like metal members 51 are overlapped as shown in FIG. 21, the outer periphery of the portion surrounding the core middle leg portion 14a, that is, the effective coil outer periphery that strongly affects the coupling degree of the coil is as follows. It becomes like this. A portion connecting two extending portions is defined as a connecting portion. The outer periphery obtained by combining the outer periphery of the connecting portion of the two plate-like metal members 51 and the outer periphery of the overlapping portion of the extending portions of the two plate-like metal members 51 is the effective coil outer periphery. In FIG. 21, the outer periphery of the effective coil is a portion obtained by excluding the outer side from the outer peripheral portion 58 from the upper plate-shaped metal member 51 and the outer periphery of the connecting portion of the lower plate-shaped metal member 51.

  By configuring in this way, the transformer 100 of the third embodiment has the same effect as that of the first embodiment. Further, in the transformer 100 according to the third embodiment, the two end portions 51a and 51b of the plate-like metal member 51 are symmetrical with respect to the central axis 51c. Therefore, the coil body according to the first and second embodiments. Unlike 70, plate metal member 45 for primary winding and plate metal member 46 for secondary winding, which are alternately stacked, are almost all in the extending portion (see FIG. 20) where the end portion extends. In the extended portion of the plate-shaped metal member 45 and the extended portion of the plate-shaped metal member 46, the extended portion of the plate-shaped metal member 45 and the extended portion of the plate-shaped metal member 46 protrude from the overlapping portion. The portion can be reduced as much as possible. By doing in this way, the part which protrudes from the effective coil outer periphery of the plate-shaped metal members 45 and 46 surrounding the core middle leg part 14a can be decreased as much as possible. Therefore, the transformer 100 according to the third embodiment can reduce the portion of the plate-like metal members 45 and 46 that protrudes from the outer periphery of the effective coil as much as possible. Therefore, the degree of coupling between the primary winding and the secondary winding can be increased. It can be higher than the transformer 100 of the first and second embodiments, is very effective with respect to the high frequency characteristics of leakage inductance and electrical resistance, and further increases the amount of heat loss in the high frequency components of the primary and secondary windings. Can be reduced.

  Further, the transformer 100 according to the third embodiment can further reduce the size and weight by reducing the heat loss amount and increasing the heat dissipation property, and the cost can be reduced accordingly. Further, the plate-like metal member 51 constituting the coil body 70 of Embodiment 3 has two end portions 51a and 51b symmetrical with respect to the central axis 51c, and the side on which the end portions 51a and 51b are arranged. When the plate-shaped metal member 51 is manufactured, specifically, when it is manufactured by punching from a sheet metal roll material with a press machine, near the connecting portion of the one plate-shaped metal member 51. Since the end portions 51a and 51b of the other plate-shaped metal member 51 can be arranged on the other, the number of parts can be increased. Since the plate-shaped metal member 51 of Embodiment 3 has a high number of parts that can be manufactured from one sheet-metal roll material, the cost of the plate-shaped metal member 51 can be reduced.

  In the present embodiment, the printed wiring board 41 and the plate-like metal member 45 for the primary winding of the coil body 70, the printed wiring board 42 and the plate-like for the secondary winding are formed in the core through-hole 14 c of the core 14. In the example, the metal member 46 is disposed so as to be included, and the protrusions 45 d and 46 d are fixed to the cooler 17 in contact with the insulating heat radiation sheet 103 disposed on the cooler 17. However, when the amount of heat loss in the primary winding and the secondary winding is small and heat can be dissipated by natural air cooling, etc., as shown in FIG. It may be fixed. FIG. 22 is a perspective view showing another transformer according to the third embodiment of the present invention. In FIG. 22, components mounted on the printed wiring board 16 are omitted.

  FIG. 22 shows an example of the transformer 100 in which the plate-like metal members 45 and 46 do not have the protrusions 45d and 46d. Further, even in the transformer 100 in which one surface of the core 14 is arranged and fixed so as to contact the cooler 17 as shown in FIG. 22, the heat dissipation of the windings (plate-like metal members 45 and 46) is performed in this shape. When it is necessary to carry out via the cooler 17, a protrusion is provided at the location of the plate-like metal members 45, 46 exposed to the outside of the core 14, and this protrusion passes through the insulating heat dissipation sheet 103. You may make it fix to the cooler 17. FIG.

  In this embodiment, the core 14 has been described for an EE type core that is an outer iron type. However, an outer iron type core such as an EI type, an EER type, an ER type, a PQ type, an I type, or a U type, etc. The present invention can also be applied to an inner iron core.

Embodiment 4 FIG.
FIG. 23 is a perspective view showing a coil body according to Embodiment 4 of the present invention, and FIG. 24 is a front view showing the coil body of FIG. FIG. 25 is a top view showing a wiring pattern and a through hole in the surface layer of the printed wiring board in FIG. 26 is a front view showing the plate-like metal member of FIG. 23, and FIG. 27 is a front view showing the adjacent plate-like metal member of FIG. In the coil body 70 of the fourth embodiment, the widths of both ends of the plate-like metal member 45 for primary winding and the plate-like metal member 46 for secondary winding in the coil body 70 of the third embodiment are increased. The coil body includes a plate-like metal member 53 for primary winding and a plate-like metal member 54 for secondary winding. In FIG. 23, parts mounted on the printed wiring board 16 are omitted.

  The coil body 70 of the fourth embodiment includes a plate-like metal member 53 for primary winding, a plate-like metal member 54 for secondary winding, a plate-like metal member 53, a plate-like metal member 54, and a core 14. Insulating members 74 that hold the plate-like metal members 53 and 54 and printed wiring boards 41 and 42 provided with wiring patterns 56 on the surface layer and the inner layer are provided. A transformer 100 (not shown) of the fourth embodiment provided with the coil body 70 of the fourth embodiment has a configuration in which the coil body 70 of FIG. 16 is changed to the coil body 70 of FIG. That is, the transformer 100 of the fourth embodiment is a place where the printed wiring board 41 for primary winding and the printed wiring board 42 for secondary winding do not contact the cooler 17 and have a symmetrical positional relationship. It is an arranged configuration.

  The plate-like metal member 53 for primary winding is provided with end portions 53a and 53b connected to the printed wiring board 41 and a projection portion 53d for winding heat dissipation. Further, the plate-like metal member 54 for secondary winding is provided with end portions 54a and 54b connected to the printed wiring board 42 and a projection portion 54d for winding heat dissipation.

  FIG. 25 schematically shows the wiring pattern 56 and the through hole 55 arranged on the surface layer of the printed wiring boards 41 and 42 constituting the primary winding and the secondary winding. The wiring pattern 56 has an elementary pattern 56 c provided with one through hole 55 and an elementary pattern 56 d provided with two through holes 55. FIG. 25 shows the wiring pattern 56 having two elementary patterns 56c and 15 elementary patterns 56d. In addition, there may be a through hole in which the plate-like metal members 53 and 54 are not connected to the elementary pattern 56c. A wiring pattern 56 for primary winding is disposed on the printed wiring board 41 in the present embodiment, and a wiring pattern 56 for secondary winding is disposed on the printed wiring board 42 in the present embodiment. A plate metal member 53 for primary winding is joined to the printed wiring board 41 for primary winding, and a plate metal member 54 for secondary winding is joined to the printed wiring board 42 for secondary winding. Is done. In the case of the step-up transformer, the number of turns of the wiring pattern 56 for the secondary winding is larger than that of the wiring pattern 56 for the primary winding, that is, the number of the elementary patterns 56d for the secondary winding is the primary winding. More than the number of element patterns 56d for use. In the case of a step-down transformer, the number of turns of the primary winding wiring pattern 56 is larger than that of the secondary winding wiring pattern 56, that is, the number of primary winding elementary patterns 56d is secondary winding. More than the number of element patterns 56d for use. The printed wiring boards 41 and 42 and the plate-like metal members 53 and 54 are joined as follows.

  The two end portions 53a and 53b of the plate metal member 53 for the primary winding respectively penetrate the through holes 55 of the printed wiring board 41, and 2 in the plate metal member 53 for the primary winding from the printed wiring board 41. The two end portions 53a and 53b are connected by being soldered in a protruding state. Similarly, the two end portions 54a and 54b of the plate-like metal member 54 for the secondary winding respectively penetrate the through holes 55 of the printed wiring board 42, and the plate-like shape for the secondary winding from the printed wiring board 42. The two end portions 54a and 54b of the metal member 54 are connected by being soldered in a protruding state.

  The plate-like metal member 53 for the primary winding and the plate-like metal member 54 for the secondary winding are, for example, a copper material having a prescribed electric resistance value as in the third embodiment. The plate metal member 53 for the primary winding provided with the projection 53d and the plate metal member 54 for the secondary winding provided with the projection 54d are the plates provided with the projection 57d shown in FIGS. The metal member 57 is used as a common part. The end portions 57a and 57b of the plate-shaped metal member 57 are formed so as to be symmetrical with respect to the central axis 57c. The ends 57a and 57b of the plate-like metal member 57 are wider than the ends 51a and 51b of the plate-like metal member 51 of the third embodiment. Correspondingly, the through holes 55 of the printed wiring boards 41 and 42 are longer in the longitudinal direction than the through holes 49 of the third embodiment, that is, the openings of the through holes are widened.

  By connecting the plate-like metal member 53 to the through-hole 55 of the wiring pattern 56 in the printed wiring board 41 via solder, the primary coil portion connected from the input 56a to the output 56b of the wiring pattern 56, that is, a plate-like shape. A primary winding in which the metal member 53 is wound a plurality of times through the wiring pattern 56 is formed. Similarly, the secondary coil portion connected from the input 56a to the output 56b of the wiring pattern 56 by connecting the plate-like metal member 54 to the through hole 55 of the wiring pattern 56 in the printed wiring board 42 via solder. That is, a secondary winding in which the plate-like metal member 54 is wound a plurality of times through the wiring pattern 56 is formed. The insulating member 74 is a resin member obtained by molding a resin material such as PPS. The insulating member 74 has a through hole 74a in which the core middle leg portion 14a of the core 14 is disposed. In addition, the insulating member 74 is provided with a recess formed by digging the thickness of the plate-like metal member 57 in a shape similar to that of the plate-like metal member 57 at a position where it contacts the plate-like metal member 57. . The plate-like metal member 57 extends so that the end portions 57a and 57b and the projection portion 57d extend from the three openings provided on the outer peripheral portion, and fits into the recessed portion of the insulating member 74, that is, engages. Has been placed. The concave portion of the insulating member 74 corresponds to the concave portion 29a in FIG. The three openings of the insulating member 74 correspond to the openings 29b, 29c, and 29d in FIG.

  As shown in FIGS. 23, 24, and 27, the plate-like metal member 53 for the primary winding and the plate-like metal member 54 for the secondary winding are alternately arranged. The primary side coil part and the secondary side coil part insulated from each other by interposing the insulating member 74 are laminated so as to be alternately inserted for each elementary coil wound once. In addition, the broken line 58 of FIG. 27 has shown the hidden outer peripheral part in the plate-shaped metal member 57 arrange | positioned below. The coil body 70 is configured as a coil body in which primary coil portions (primary windings) and secondary coil portions (secondary windings) are alternately arranged. The plate-like metal member 57 which is a common part of the plate-like metal member 53 for the primary winding and the plate-like metal member 54 for the secondary winding has the positions of the end portions 57 a and 57 b to form the coil body 70. In the extended portion (the portion surrounded by the broken lines 104 and 105 in FIG. 26) where the end portions 57a and 57b extend as shown in FIG. Except for the tip portions of the end portions 57a and 57b, all the regions are formed to overlap each other. In this way, when the two plate-like metal members 57 are overlapped as shown in FIG. 27, the outer periphery of the connecting portion of the two plate-like metal members 57 and the overlapping portion of the extension portions of the two plate-like metal members 57 The outer periphery combined with the outer periphery of the coil becomes the effective coil outer periphery. In FIG. 27, the outer periphery of the effective coil is a portion obtained by excluding the outer side from the outer peripheral portion 58 from the upper plate-shaped metal member 57 and the outer periphery of the connecting portion of the lower plate-shaped metal member 57.

  By configuring in this way, the transformer 100 including the coil body 70 of the fourth embodiment has the same effect as that of the first embodiment. Further, in the coil body 70 of the fourth embodiment, as in the third embodiment, the two end portions 57a and 57b of the plate-like metal member 57 are symmetrical with respect to the central axis 57c. Unlike coil body 70 of the first and second embodiments, stretched portions at which end portions of plate metal member 53 for primary winding and plate metal member 54 for secondary winding are alternately stacked. 26 (see FIG. 26), all the regions overlap, and in the extended portion of the plate-like metal member 53 and the extended portion of the plate-like metal member 54, the extended portion of the plate-like metal member 53 and the plate-like metal member 54 The part which protrudes from the part which an extending | stretching part overlaps can be decreased as much as possible. By doing in this way, the part which protrudes from the effective coil outer periphery of the plate-shaped metal members 53 and 54 surrounding the core middle leg part 14a can be decreased as much as possible. Therefore, the transformer 100 of the fourth embodiment can reduce the portion of the plate-like metal members 53 and 54 that protrudes from the outer periphery of the effective coil as much as possible, so that the degree of coupling between the primary winding and the secondary winding is increased. It can be higher than the transformer 100 of the first and second embodiments, is very effective with respect to the high frequency characteristics of leakage inductance and electrical resistance, and further increases the amount of heat loss in the high frequency components of the primary and secondary windings. Can be reduced. Moreover, the transformer 100 of the fourth embodiment can further reduce the size and weight by reducing the amount of heat loss and increasing the heat dissipation property, and the cost can be reduced accordingly.

  Further, the transformer 100 of the fourth embodiment is a method for further reducing the loss as compared with the transformer 100 of the third embodiment, in particular, as much as the DC electric resistance value of the primary winding and the secondary winding in the coil body 70. A technique to reduce heat loss was adopted. In order to reduce the heat loss corresponding to the DC electric resistance value of the primary winding and the secondary winding, as shown in FIGS. 23 and 24, the plate-like metal member 53 for the primary winding, the plate for the secondary winding, It is effective to increase the widths of the end portions 53a, 53b, 54a, 54b of the metal member 54. Further, as shown in FIGS. 26 and 27, by reducing the distance between the two end portions 57a and 57b of the plate-like metal member 57, the through-hole of the wiring pattern 56 to which the plate-like metal member 57 is inserted and joined is reduced. The length of the wiring part between the holes 55 is reduced, and the DC electric resistance value in the wiring pattern 56 can be reduced. Therefore, the coil body 70 according to the fourth embodiment can reduce the DC electric resistance value in the wiring pattern 56, so that the DC electric resistance component in the heat loss amount in the primary winding and the secondary winding can be reduced. It becomes possible.

Embodiment 5. FIG.
28 is a perspective view showing a coil body according to Embodiment 5 of the present invention, FIG. 29 is a front view showing the plate-like metal member of FIG. 28, and FIG. 30 is an end of the plate-like metal member of FIG. It is a front view which shows an example of a part shape. 31 is a front view showing another end shape of the plate-shaped metal member of FIG. 29, and FIG. 32 is a front view showing still another end shape of the plate-shaped metal member of FIG.

  The coil body 70 of the fifth embodiment shown in FIG. 28 is a plate-like metal member 18 for primary winding and a plate-like metal member for secondary winding in the coil body 70 of the first embodiment shown in FIG. The coil body 19 is changed to a plate-like metal member 59 for primary winding and a plate-like metal member 59 for secondary winding. Other configurations are the same as those of the first embodiment. The plate-like metal member 59 shown in FIG. 29 has a shape in which two end portions 59a and 59b are arranged at positions having asymmetry with respect to the central axis 59c. Two concave portions 75 are formed in the two end portions 59a and 59b, respectively.

  FIG. 30 shows an end portion 59a of the plate-shaped metal member 59 surrounded by a circle 80 in FIG. In FIG. 30, the printed wiring board 16 is indicated by a broken line so that the position of the recess 75 with respect to the printed wiring board 16 can be understood. In the plate-like metal member 24 that is a common part of the plate-like metal members 18 and 19 in the first embodiment, the outer periphery of the end portion 24a and the outer periphery of the end portion 24b have a flat rectangular shape (see FIG. 6). On the other hand, a concave portion 75 is provided on the outer periphery of the end portion 59 a of the plate-like metal member 59. 29 and 30, both side surfaces in the width direction that are inward from the tip inserted into the through holes 20 and 22 (see FIG. 3) of the printed wiring board 16 and perpendicular to the extending direction of the end (upward in FIG. 29). An example in which the recess 75 is provided is shown.

  As described above, the plate-like metal member 24 of the first embodiment has a rectangular shape in which the outer periphery of the end portion 24a and the outer periphery of the end portion 24b are flat. For this reason, the plate-shaped metal member 24 has a large heat capacity and a large surface area. Therefore, when the printed wiring board 16 and the plate-shaped metal member 24 are joined by soldering, the plate-shaped metal member is melted by solder. There is a case where the temperature is not raised to a temperature or a long time is required until the temperature is raised. On the other hand, since the end portion 59a provided with the concave portion 75 locally reduces the cross-sectional area of the plate-like metal member 59, the thermal resistance locally increases at this portion, and the soldering is performed. It is possible to easily raise the temperature of the end portion 59a.

  When the printed wiring board 16 and the plate-like metal member 59 are joined by soldering, a shape that can easily increase the temperature of the end portion 59a is considered other than the shape shown in FIG. For example, as shown in FIG. 31, a recess 76 is provided at the tip, and an end 59a obtained by dividing the tip, or an end provided with both the recess 75 and the recess 76 of FIGS. 30 and 31 as shown in FIG. 59a may also be used. 31 and 32, the cross-sectional area of the plate-like metal member 59 is locally reduced, so that the thermal resistance is locally increased and the temperature can be easily increased during soldering. It becomes. In addition to the method of providing the recesses on the outer periphery of the end, a method of locally reducing the cross-sectional area by providing a hole (not shown) in the end metal part may be used.

  As described above, in the coil body 70 according to the fifth embodiment, the plate-like metal member 59 constituting the primary winding and the secondary winding is provided with the concave portions 75 and the concave portions 76 at the end portions 59a and 59b. In particular, the thermal resistance increases at the portion where the cross-sectional area of the plate-like metal member 59 is reduced, and when the printed wiring board 16 and the plate-like metal member 59 are joined by soldering, the end portion 59a is easily heated. It becomes possible to do. Therefore, the coil body 70 according to the fifth embodiment can raise the temperature of the plate-like metal member 59 to the solder melting temperature, or can shorten the time until the temperature rises as compared with the first embodiment.

Embodiment 6 FIG.
33 is a perspective view showing a coil body according to Embodiment 6 of the present invention, FIG. 34 is a front view showing the plate-like metal member of FIG. 33, and FIG. 35 is an end of the plate-like metal member of FIG. It is a front view which shows an example of a part shape. 36 is a front view showing another end shape of the plate-shaped metal member of FIG. 34, and FIG. 37 is a front view showing still another end shape of the plate-shaped metal member of FIG.

  The coil body 70 of the sixth embodiment shown in FIG. 33 is a plate-like metal member 45 for primary winding and a plate-like metal member for secondary winding in the coil body 70 of the third embodiment shown in FIG. The coil body 46 is changed to a plate-like metal member 62 for primary winding and a plate-like metal member 62 for secondary winding. Other configurations are the same as those of the third embodiment. The plate-shaped metal member 62 shown in FIG. 34 has a protruding portion 62d and has a shape in which two end portions 62a and 62b are arranged at positions having symmetry with respect to the central axis 62c. ing. Two concave portions 75 are formed in the two end portions 62a and 62b, respectively.

  FIG. 35 shows an end 62a of the plate-like metal member 62 surrounded by a circle 81 in FIG. In FIG. 35, the printed wiring board 41 is indicated by a broken line so that the position of the recess 75 with respect to the printed wiring board 41 can be understood. In the plate-like metal member 51 that is a common part of the plate-like metal members 45 and 46 in the third embodiment, the outer periphery of the end portion 51a and the outer periphery of the end portion 51b have a flat rectangular shape (see FIG. 20). On the other hand, a recess 75 is provided on the outer periphery of the end 62 a of the plate-like metal member 62. In FIGS. 34 and 35, on both side surfaces in the width direction that are inward from the tip inserted into the through hole 49 (see FIG. 19) of the printed wiring board 41 and perpendicular to the extending direction of the end (right direction in FIG. 34) The example in which the recessed part 75 was provided was shown.

  As described above, the plate-shaped metal member 51 of the third embodiment has a rectangular shape in which the outer periphery of the end portion 51a and the outer periphery of the end portion 51b are flat. For this reason, since the plate-shaped metal member 51 has a large heat capacity and a large surface area, when the printed wiring boards 41 and 42 and the plate-shaped metal member 51 are joined by soldering, the plate-shaped metal member There is a case where the temperature is not raised to the solder melting temperature or a long time is required until the temperature is raised. On the other hand, since the end portion 62a provided with the recess 75 locally reduces the cross-sectional area of the plate-like metal member 62, the thermal resistance locally increases at this portion, and the soldering is performed. It is possible to easily raise the temperature of the end 62a.

  When the printed wiring boards 41 and 42 and the plate-like metal member 62 are joined by soldering, a shape that can easily increase the temperature of the end 62a is considered other than the shape of FIG. For example, as shown in FIG. 36, a recess 76 is provided at the tip and the tip 62a is divided, and as shown in FIG. 37, both ends of the recess 75 and the recess 76 of FIGS. 35 and 36 are provided. 62a may also be used. 36 and 37, the cross-sectional area of the plate-like metal member 62 is also locally reduced, so that the thermal resistance is locally increased and the temperature can be easily increased during soldering. It becomes. In addition to the method of providing the recesses on the outer periphery of the end, a method of locally reducing the cross-sectional area by providing a hole (not shown) in the end metal part may be used.

  As described above, in the coil body 70 of the sixth embodiment, the plate-like metal member 62 constituting the primary winding and the secondary winding is provided with the concave portions 75 and the concave portions 76 at the end portions 62a and 62b. In particular, the thermal resistance increases at the portion where the cross-sectional area of the plate-like metal member 62 is reduced, and it is easy to raise the temperature of the end 62a when the printed wiring boards 41, 42 and the plate-like metal member 62 are joined by soldering. It becomes possible to carry out. Therefore, the coil body 70 according to the sixth embodiment can raise the temperature of the plate-like metal member 62 to the solder melting temperature, or can shorten the time until the temperature rises as compared with the third embodiment.

  In the first to sixth embodiments, the transformer has been described as the electromagnetic induction device. However, a reactor or a choke coil may be used. In addition, within the scope of the present invention, the contents of the respective embodiments can be freely combined, or the respective embodiments can be appropriately modified or omitted within a consistent range.

  DESCRIPTION OF SYMBOLS 14 ... Core, 16 ... Printed wiring board, 17 ... Cooler, 18 ... Plate-shaped metal member (metal member), 18a, 18b ... End, 19 ... Plate-shaped metal member (metal member), 19a, 19b ... End , 20 through holes, 21 wiring patterns, 21c, 21d elementary patterns, 22 through holes, 23 wiring patterns, 23c, 23d elementary patterns, 24 plate metal members (metal members), 24a, 24b,. End part, 24c ... central axis, 25 ... insulating member, 25a ... concave part (engagement concave part), 29 ... insulating member, 29a ... concave part (engagement concave part), 32 ... plate-shaped metal member (metal member), 32a, 32b ... end, 32d ... projection, 34 ... plate-like metal member (metal member), 34a, 34b ... end, 34d ... projection, 36 ... plate-like metal member (metal member), 36a, 36b ... end, 36c ... center axis, 36d ... projection , 41, 42 ... printed wiring board, 43 ... insulating member, 45 ... plate-like metal member (metal member), 45a, 45b ... end, 45d ... projection, 46 ... plate-like metal member (metal member), 46a , 46b ... end, 46d ... projection, 49 ... through hole, 50 ... wiring pattern, 50c, 50d ... elementary pattern, 51 ... plate metal member (metal member), 51a, 51b ... end, 51c ... central axis , 51d ... projection, 53 ... plate-like metal member (metal member), 53a, 53b ... end, 53d ... projection, 54 ... plate-like metal member (metal member), 54a, 54b ... end, 54d ... projection Part 55 ... through hole 56 ... wiring pattern 56c 56d ... elementary pattern 57 ... plate metal member (metal member) 57a, 57b ... end, 57c ... center axis 57d ... projection part 59 ... plate Metal member (metal member 59a, 59b ... end, 59c ... central axis, 62 ... plate-like metal member (metal member), 62a, 62b ... end, 62c ... central axis, 62d ... projection, 73 ... insulating member, 74 ... insulating member 75 ... concave, 76 ... concave, 70 ... coil body, 100 ... transformer

Electromagnetic induction device of the present invention, the core and the coil portion in which a plurality of plate-like metal member which is formed on the arranged Rutotomoni plate shape so as to surround a portion of the core are connected by printed circuit board constituting a closed magnetic circuit A coil body. The printed wiring board has a plurality of elementary patterns provided with through holes. The coil portion has an insulating member that insulates adjacent plate-shaped metal members from each other, and two end portions of the plate-shaped metal members are inserted and connected to through holes of different elementary patterns, and the number of metal members is the core. It is a structure that goes around. A printed wiring board is arrange | positioned in the position which does not contact the mounting surface of the cooler by which the said electromagnetic induction apparatus is mounted.

The electromagnetic induction device of the present invention has a plurality of plate-like metal members, and includes a coil body in which two end portions of the plate-like metal member are inserted and connected to through holes of a printed wiring board. Inspection can be easily performed, product reliability is high, the size is small, and the heat radiation of the winding and the core can be performed efficiently.

Claims (16)

An electromagnetic induction device comprising: a core constituting a closed magnetic path; and a coil body having a coil portion in which a plurality of metal members arranged so as to surround a part of the core are connected by a printed wiring board,
The printed wiring board has a plurality of elementary patterns provided with through holes,
The coil portion is
An insulating member that insulates adjacent metal members from each other;
Two ends of the metal member are inserted and connected to the through-holes of the different elementary patterns, respectively, and are structures that circulate the core by the number of the metal members,
The electromagnetic induction device, wherein the printed wiring board is disposed at a position not in contact with a mounting surface of a cooler on which the electromagnetic induction device is mounted.   The electromagnetic induction device according to claim 1, wherein the metal member is a plate-like metal member formed in a plate shape. The metal member is a plate-shaped metal member formed in a plate shape,
The coil body includes two coil portions,
The electromagnetic induction device according to claim 1, wherein the electromagnetic induction device is a transformer in which one of the coil portions is a primary coil and the other coil portion is a secondary coil. The plate-like metal member has two end portions arranged at positions asymmetric with respect to the central axis of the plate-like metal member,
The electromagnetic induction device according to claim 3, wherein the plate-like metal member in the primary coil and the plate-like metal member in the secondary coil are alternately arranged.   The electromagnetic induction device according to claim 2, wherein the plate-shaped metal member has a protruding portion extended toward the mounting surface side of the cooler.   5. The electromagnetic induction device according to claim 3, wherein the plate-shaped metal member has a protrusion extended to the mounting surface side of the cooler.   7. The projection of the plate-shaped metal member in the primary coil and the projection of the plate-shaped metal member in the secondary coil are arranged so as to maintain a certain distance. The electromagnetic induction device described. Two printed wiring boards are provided,
The primary coil has one of the printed wiring boards, and the secondary coil has the other printed wiring board,
The electromagnetic induction device according to any one of claims 3, 4, 6, and 7, wherein the two printed wiring boards are arranged on opposite sides of the coil body.   The electromagnetic induction device according to claim 1, wherein the coil body is a reactor including one coil portion.   The electromagnetic induction device according to claim 2, wherein the coil body is a reactor including one coil portion.   11. The electromagnetic induction device according to claim 2, wherein the insulating member has an engagement recess with which the plate-like metal member is engaged.   The electromagnetic induction device according to any one of claims 1 to 11, wherein the metal member is connected to the through hole of the printed wiring board by solder.   The electromagnetic induction device according to claim 12, wherein the metal member is connected by solder in a state where the end portion protrudes from the through hole of the printed wiring board.   The metal member is connected by solder in a state where the end portion is arranged so as to coincide with the opening surface of the through hole of the printed wiring board, or in a state where it is arranged inside the opening surface of the through hole. The electromagnetic induction device according to claim 12.   The electromagnetic induction device according to any one of claims 1 to 14, wherein the through hole has an elongated opening shape.   The electromagnetic induction device according to claim 1, wherein the metal member has a recess or a hole formed at the end.

Images