JP2010092986A - Choke coil and transformer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a choke coil and a transformer, allowing easy mounting of a winding formed of a band-like conductor, and reducing a burden of operation for preventing drop of the mounted winding. <P>SOLUTION: A secondary winding 30 is mounted by moving in an arrow B direction to insert a winding part 31 of a first turn and a winding part 42 of a second turn between a first spool part 11 and a second spool part 21. As the winding part 31 of the first turn and the winding part 42 of the second turn are inserted between the first spool part 11 and second spool part 21, tip end sides of the two winding parts are slightly opened. By further inserting, the winding part 31 of the first turn climbs over a retaining rib 16, and is fitted between a tip end side rib 14 and the retaining rib 16. In this state, a gap in a center of the winding part 31 of the first turn is fitted to the annular retaining rib 16, and thus, even when force for dropping the secondary winding 30 is applied, an inner circumferential surface 40 abuts on the retaining rib 16 to restrict movement. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a choke coil and a transformer, and more particularly to a choke coil and a transformer used in a power supply device.

  Since many choke coils and transformers used for power supply devices are relatively large in size corresponding to a large current and the assembly process and the like are complicated, various configurations in consideration of good assemblability have been developed. For example, in Japanese Utility Model Laid-Open No. 5-79922, a notch is provided in the spacer of the intermediate bobbin so that the intermediate bobbin around which the winding is wound can be easily fitted to the bobbin with a pin terminal. Japanese Patent Application Laid-Open No. 7-240327 discloses a large-capacity power supply device using a strip conductor (bus bar) such as a copper strip as a winding.

  10A and 10B show a prior art of a transformer using a strip conductor, where FIG. 10A is a perspective view of the strip conductor serving as a primary winding, and FIG. 10B is a perspective view of the strip conductor mounted on a bobbin. In FIG. 10, 60 is a bobbin, 61 is a primary winding, 62 is a terminal, and 63 is a winding frame. As shown in FIG. 10A, the primary winding 61 is a strip-shaped conductor made of a thin metal plate and is formed as a one-turn winding, and a terminal 62 is provided at the end. Further, as shown in FIG. 10B, the primary winding 61 is mounted on the winding frame 63 of the bobbin 60 so that the space between the terminals 62 is widened. After the primary winding 61 is molded, the secondary winding (not shown) is formed on the mold portion. Winding is wound. According to this structure, since the secondary winding is wound on the molded primary winding 61, there is an advantage that the distance between the two windings is reduced and the connectivity is improved.

However, in this structure, it is not possible to attach the reel 63 to the reel 63 unless the terminals 62 are opened widely. However, in order to open the terminals 62 widely, it is necessary to apply a large force, which is a heavy burden on the assembly operator. In addition, a means for preventing the attached winding from falling off is also required. In this structure, the secondary winding has the function, but in any case, the work load is larger and the structure becomes more complicated than fixing the wire material such as copper wire.
Japanese Utility Model Publication No. 5-79922 Japanese Patent Laid-Open No. 7-240327

  In order to solve the above problems, the present invention provides a choke coil and a transformer in which a winding formed of a strip conductor can be easily mounted and a work load for preventing the mounted winding from falling off is light. An object is to provide a coil and a transformer.

  The invention described in claim 1 is a choke coil comprising a winding formed from a strip-shaped conductor and a bobbin to which the winding is mounted, wherein the winding is a first winding portion of one turn. A second winding part of one turn arranged in parallel with the first winding part, a connecting part connecting the end part of the first winding part and the end part of the second winding part, And is mounted by sandwiching the bobbin between the first winding part and the second winding part, and the bobbin is attached to the first winding part in a state of mounting the winding. The first mounting surface and the second mounting surface that are in pressure contact with the second winding portion, respectively, and at least one of the first mounting surface and the second mounting surface is the first winding portion or The protrusion gradually protrudes as the distance from the side where the connecting portion is located at the portion surrounded by the second winding portion. A choke coil, characterized in that is formed with retaining portions of the line.

  According to a second aspect of the present invention, there is provided a choke coil including a winding formed from a strip-shaped conductor and a bobbin on which the winding is mounted. The winding includes a winding portion of one turn; A clamping part that faces the winding part, and a connecting part that connects an end part of the winding part and an end part of the clamping part, and between the winding part and the clamping part, The bobbin is mounted by inserting a bobbin, and the bobbin includes a first mounting surface and a second mounting surface that are in pressure contact with the winding portion and the clamping portion, respectively, in a state where the winding is mounted, The choke coil is characterized in that the first mounting surface is formed with a retaining portion of the winding that gradually protrudes from the side where the connecting portion is located at a portion surrounded by the winding portion. .

  According to a third aspect of the present invention, in the transformer comprising a winding formed from a strip-shaped conductor and a bobbin to which the winding is mounted, the winding has a first winding portion of one turn, A one-turn second winding portion disposed in parallel with the first winding portion; and a connecting portion connecting the end portion of the first winding portion and the end portion of the second winding portion. And is mounted by sandwiching the bobbin between the first winding portion and the second winding portion, and the bobbin is attached to the first winding portion and the second winding portion in a state where the winding is mounted. The first mounting surface and the second mounting surface are in pressure contact with the second winding portion, respectively, and at least one of the first mounting surface and the second mounting surface is the first winding portion or the The winding gradually protrudes as it moves away from the side where the connecting portion is located at the portion surrounded by the second winding portion. Trans, characterized in that is formed with stop portions.

  According to a fourth aspect of the present invention, there is provided a transformer including a winding formed from a strip-shaped conductor and a bobbin on which the winding is mounted. The winding includes a winding portion of one turn and the winding. A bobbin provided between the winding portion and the sandwiching portion, the sandwiching portion facing the wire portion, and a connecting portion connecting the end of the winding portion and the end of the sandwiching portion. The bobbin includes a first mounting surface and a second mounting surface that are in pressure contact with the winding portion and the clamping portion, respectively, in a state in which the winding is mounted. One mounting surface is a transformer characterized in that a retaining portion of the winding that gradually protrudes as the distance from the side where the connecting portion is located is formed at a portion surrounded by the winding portion.

  According to a fifth aspect of the invention, in the invention of the third or fourth aspect, the bobbin connects the first mounting surface and the second mounting surface and winds another winding. The transformer further comprising a body portion, wherein the retaining portion is an end portion of the cylindrical portion.

  According to the first aspect of the present invention, since the retaining portion that gradually protrudes as the distance from the side where the coupling portion is located is provided, the side where the first winding portion and the second winding portion are not coupled is slightly opened. Even if this happens, the tapered stopper prevents the winding from falling off. In addition, since the protruding portion of the retaining portion becomes smaller toward the connecting portion side, when the bobbin is sandwiched between the first winding portion and the second winding portion, the first winding portion or the second winding portion is Since it is gradually pushed open so as to get over the retaining portion, the operator does not have to push open the first winding portion or the second winding portion directly by hand, and the winding can be easily mounted on the bobbin.

  According to the second aspect of the present invention, since the retaining portion that gradually protrudes as the distance from the side where the connecting portion is located is provided, even if the tip end side of the winding portion is slightly separated from the bobbin, it becomes tapered. The retaining part serves as a barrier to prevent the winding from falling off. In addition, the protrusion is smaller as it goes to the connecting part, so when the bobbin is sandwiched between the winding part and the holding part, the winding part is gradually pushed open so that it gets over the prevention part. The operator does not need to push the winding part directly by hand, and the winding can be easily attached to the bobbin.

  According to the third aspect of the invention, since the retaining portion that gradually protrudes as the distance from the side where the coupling portion is located is provided, the side where the first winding portion and the second winding portion are not coupled is slightly opened. Even if there is, there is a taper retaining portion that acts as a barrier to prevent the winding from falling off. In addition, since the protruding portion of the retaining portion becomes smaller toward the connecting portion side, when the bobbin is sandwiched between the first winding portion and the second winding portion, the first winding portion or the second winding portion is Since it is gradually pushed open so as to get over the retaining part, it is not necessary for the operator to push the first winding part or the second winding part directly by hand, and the winding can be easily attached to the bobbin.

  According to the fourth aspect of the present invention, since the retaining portion that gradually protrudes as the distance from the side where the connecting portion is located is provided, even if the tip end side of the winding portion is slightly separated from the bobbin, it becomes tapered. The retaining part serves as a barrier to prevent the winding from falling off. In addition, the protrusion is smaller as it goes to the connecting part, so when the bobbin is sandwiched between the winding part and the holding part, the winding part is gradually pushed open so that it gets over the prevention part. The operator does not need to push the winding part directly by hand, and the winding can be easily attached to the bobbin.

  According to the fifth aspect of the present invention, since the end portion of the winding drum portion is used as the retaining portion, it is not necessary to provide a separate retaining portion on the first mounting surface or the second mounting surface.

[First Embodiment]
Hereinafter, a method for mounting the secondary winding on the bobbin according to the first embodiment of the transformer according to the first embodiment of the present invention will be described. 1A and 1B show a mounting method of a secondary winding according to a first embodiment of the present invention, where FIG. 1A is a perspective view and FIG. 1B is a cross-sectional view taken along line AA. FIGS. 2A and 2B show a mounting process of the secondary winding according to the first embodiment of the present invention, where FIG. 2A is a cross-sectional view taken along the line AA, and FIG. 2B is a perspective view. In FIGS. 1 and 2, 10 is a bobbin, 11 is a first winding frame portion, 12 is a winding mounting surface, 13 is an upper rib, 14 is a leading rib, 15 is a lower rib, 16 is a retaining rib, and 17 is a base. End side terminal block, 18 is a front end side terminal block, 20 is a hollow portion, 21 is a second winding frame portion, 24 is a base end side terminal block, 26 is a winding body portion, 27 is a terminal, 30 is a secondary winding, 31 is a winding part of the first turn, 32 is an external connection part, 34 is an upper part, 35 is a tip part, 36 is a lower part, 39 is a connecting part, 40 is an inner peripheral surface, 42 is a winding part of the second turn, 48 is an external connection part, 49 is a core.

  The bobbin 10 according to this embodiment includes a first winding frame portion 11 and a second winding portion for mounting a secondary winding in a direction perpendicular to a cylindrical winding body portion 26 for winding a primary winding (not shown). A winding frame portion 21 is provided, and a base end side terminal block 17 and a distal end side terminal block 18, a proximal end side terminal block 24, and a distal end side terminal block 25 are provided at the lower portions of these winding frame portions, respectively. Further, the first winding frame portion 11 is provided with a winding mounting surface 12, which is a surface to which the winding portion 31 of the first turn is pressed when the secondary winding 30 is mounted. Further, the first reel portion 11 is provided with retaining ribs 16. Note that the second reel part 21 is not provided with an equivalent to the retaining rib 16, but the configuration of the other parts is the same as that of the first reel part 11. The secondary winding 30 is moved so that the winding portion 31 of the first turn and the winding portion 42 of the second turn are sandwiched between the first winding frame portion 11 and the second winding frame portion 21. That is, it is mounted by moving in the direction of arrow B in FIG. Further, the winding part 31 of the first turn and the winding part 42 of the second turn are provided in parallel, and these distances are the winding mounting surfaces of the first winding frame part 11 and the second winding frame part 21. Is approximately equal to the distance between.

  The retaining rib 16 prevents the secondary winding 30 from moving and dropping in the direction of the arrow C in FIG. 2B after the secondary winding 30 is mounted on the bobbin 10. Further, the winding mounting surface 12 has the hollow portion 20 of the winding body portion 26 opened at the center thereof, and the retaining rib 16 is provided in an annular shape around the opening. Further, as shown in FIG. 1B, the retaining rib 16 is formed so as to gradually protrude from the winding mounting surface 12 toward the distal end side terminal block 18 side from the proximal end side terminal block 17 side. Further, the distance between the leading end side rib 14 and the retaining rib 16 provided on the edge of the winding portion 31 of the first turn and the winding portion 31 of the first turn is larger than the width of the winding portion 31 of the first turn. Slightly larger.

  With these configurations, when the winding portion 31 of the first turn and the winding portion 42 of the second turn are sandwiched between the first winding frame portion 11 and the second winding frame portion 21, FIG. ), The retaining rib 16 pushes up the tip 35 of the winding portion 31 of the first turn, that is, the tip side of the winding portion 31 of the first turn and the winding portion 42 of the second turn is slightly. Acts to open. When further sandwiched, the winding portion 31 of the first turn gets over the retaining rib 16 and fits between the distal end side rib 14 and the retaining rib 16 to be in the state shown in FIG. In this state, since the gap at the center of the winding portion 31 of the first turn is fitted in the annular retaining rib 16, even if a pressing force in the direction of arrow C is applied to the secondary winding 30, The inner peripheral surface 40 of the first reel unit 11 abuts against the retaining rib 16 and its movement is restricted.

  As described above, in this embodiment, when the secondary winding 30 is mounted on the bobbin 10, the winding portion 31 of the first turn and the winding portion 42 of the second turn are connected by an operator's hand or tool. Even if it is not opened, the distal end sides of the winding portion 31 of the first turn and the winding portion 42 of the second turn are slightly opened, so that the secondary winding 30 can be easily mounted. Further, since the secondary winding 30 sandwiches the bobbin 10 and the retaining rib 16 is provided to prevent the secondary winding 30 from falling off, after the secondary winding 30 is mounted, the secondary winding 30 is subjected to secondary force by external force. The winding 30 does not easily fall off.

  Further, details of each part will be described. FIG. 3 is a perspective view showing the bobbin according to the first embodiment of the present invention. FIG. 4 shows the bobbin according to the first embodiment of the present invention, wherein (a) is a plan view, (b) is a front view, and (c) is a side view. 3 and 4, 19 is an opening, 22 is an upper rib, 23 is a tip-side rib, 25 is a tip-side terminal block, 28 is a winding mounting surface, and 29 is an opening.

  The bobbin 10 is made of an insulating material such as resin except for the terminal 27. In addition, a first winding frame portion 11 and a second winding frame portion 21 for mounting the secondary winding are provided in a direction perpendicular to the cylindrical winding body portion 26 around which the primary winding is wound. The basic configuration is such that the base end side terminal block 17 and the tip end side terminal block 18, the base end side terminal block 24, and the tip end side terminal block 25 are provided at the lower part of the frame part.

  The first winding frame portion 11 is provided in the vicinity of the end portion of the winding drum portion 26 in the shape of a hook of the winding drum portion 26, and one turn of the winding formed from the strip-shaped conductor on the winding mounting surface 12 Wear eyes. Further, an upper rib 13, a distal end side rib 14 and a lower rib 15 are provided at the upper portion, the distal end portion, and the lower portion of the edge of the first winding frame portion 11, respectively. Further, the end portion of the winding body portion 26 protrudes from the winding mounting surface 12, and the protruding portion serves as a retaining rib 16. The base end side of the first winding frame portion 11 is an opening 19 for inserting a winding without forming a rib. That is, when the winding is mounted on the winding mounting surface 12, if there is no rib on the base end side of the first winding frame portion 11, the winding can be easily inserted from the base end side. There are no ribs. The distance between the winding mounting surface 12 and the winding mounting surface 28 is equal to the distance between the winding portion 31 of the first turn and the winding portion 42 of the second turn.

  The upper rib 13 and the lower rib 15 are formed so as to rise vertically from the edge of the winding mounting surface 12 and guide the winding inserted from the opening 19. The distal end side rib 14 restricts the movement of the winding inserted from the proximal end side of the first winding frame portion 11. Further, as described above, when the winding portion 31 of the first turn gets over the retaining rib 16 and fits between the leading end side rib 14 and the retaining rib 16 as described above, A gap in the center of the winding portion 31 is provided so as to fit into the annular retaining rib 16. In this embodiment, in order to facilitate the formation of the bobbin 10, a part of the distal rib 14 is integrated with the distal terminal block 25 and a part of the lower rib 15 is integrated with the proximal terminal block 24. However, these may be separated. Further, the height of the most protruding portion of the retaining rib 16 is about 1 mm, but this height can be appropriately changed according to the size, material, etc. of the winding and is not particularly limited to a height of 1 mm. Absent.

  The base end side terminal block 17 is formed integrally with the base end side portion at the bottom of the first winding frame portion 11. Similarly, the distal end side terminal block 18 is formed integrally with the lower end side portion of the first winding frame portion 11. Terminals 27 are provided at a total of four locations on the distal end surfaces of the base end side terminal block 17 and the distal end side terminal block 18 and the lower surface near the first winding frame portion 11. In this embodiment, the base end side terminal block 17 and the front end side terminal block 18 are shaped so as to extend in parallel with the winding body portion 26 from the first winding frame portion 11, but these shapes are the substrates to be mounted. It can change suitably according to etc., and is not restricted to the shape of FIG.3 and FIG.4. Further, the number of terminals 27 to be provided can be appropriately selected according to design conditions and the like.

  The second winding frame portion 21 is provided in a shape like a collar of the winding drum portion 26 in parallel with the first winding reel portion 11 and in the vicinity of the ends of the first winding reel portion 21 and the winding drum portion 26. ing. Similarly to the first winding frame portion 11, an upper rib 22, a tip side rib 23, and a lower rib 28 are provided at the upper portion, the tip portion, and the lower portion of the edge, respectively. The base end side of the second winding frame portion 21 is an opening 29 for inserting a second turn of a winding formed from a strip-shaped conductor without forming a rib.

  In this embodiment, the second winding frame portion 21 is not provided with a retaining rib so that the secondary winding 30 can be mounted on the bobbin without much deformation. Of course, it is possible to provide ribs similar to the retaining ribs 16 in the second winding frame portion 21 as well, so that the windings can be held more reliably. In this embodiment, the retaining rib is not particularly limited to the first reel unit 11 as long as it is provided on either the first reel unit 11 or the second reel unit 21.

  The winding drum portion 26 is provided with a hollow portion 20 so that the core 49 shown in FIG. 1 is inserted therein, and a primary winding (not shown) formed from a conductor wire is wound around the winding drum portion 26. The The hollow portion 20 is an opening at the center of the first winding frame portion 11 and the second winding frame portion 21. Therefore, in this embodiment, the primary winding is provided between the first turn and the second turn of the secondary winding. Further, the distance separating the primary winding and the secondary winding is only the thickness of the first winding frame portion 11 or the second winding frame portion 21. In this embodiment, the primary winding may be a conductor wire, and the material is not particularly limited. Furthermore, as described above, the end on the first winding frame 11 side is the retaining rib 16. Further, the core 49 may have any shape or material as long as the above configuration is established.

  Although this embodiment relates to a transformer, if it is used as it is without winding a winding around the winding body 26, it can be preferably used as a choke coil.

  Next, the secondary winding will be described. FIG. 5 is a perspective view showing the secondary winding according to the first embodiment of the present invention. FIG. 6 shows the secondary winding according to the first embodiment of the present invention, in which (a) is a plan view, (b) is a front view, and (c) is a side view. 5 and 6, 30 is a secondary winding, 31 is a winding part of the first turn, 32 is an external connection part, 33 is a bent part, 34 is an upper part, 35 is a tip part, 36 is a lower part, 37 Is a base part, 38 is a bent part, 39 is a connecting part, 40 is an inner peripheral surface, 41 is a bent part, 42 is a winding part for the second turn, 43 is a base part, 44 is an upper part, 45 is A tip part, 46 is a lower part, 47 is a bent part, and 48 is an external connection part.

  The secondary winding 30 is made of a highly conductive metal such as a copper alloy. In addition, the winding is a two-turn winding, and the winding portion 31 of the first turn and the winding portion 42 of the second turn are integrated via the connecting portion 39. Further, the winding part 31 of the first turn and the winding part 42 of the second turn are formed to be parallel. Further, as described above, these distances are equal to the distance between the winding mounting surface 12 and the winding mounting surface 28. Therefore, in the state where the secondary winding 30 is mounted on the bobbin 10, the first turn The winding portion 31 and the winding portion 42 of the second turn self-hold with the winding mounting surface 12 and the winding mounting surface 28 interposed therebetween. Furthermore, these intervals are set in accordance with the intervals between the winding mounting surfaces of the first and second winding frame portions 11 and 21. In other words, the winding part 31 of the first turn and the winding part 42 of the second turn of the secondary winding 30 can sandwich the first winding frame part 11 and the second winding frame part 21 of the bobbin 10 from the outside. I have to. In addition, the above structure is implement | achieved by giving press work etc. to the metal plate of 1 sheet.

  Further, an external connection portion 32 is provided at the beginning of the secondary winding 30 so as to extend in the horizontal direction, so that the connection with the adjacent secondary winding or the like is facilitated. From the external connection part 32, it continues to the upper part 34, the tip part 35, the lower part 36, and the base end part 37 of the winding part 31 of the first turn through the bending part 33, and further bent from the base end part 37. It continues to the connecting part 39 via the part 38. In addition, the base part 43, the upper part 44, the tip part 45, and the lower part 46 of the winding part 42 of the second turn are connected from the connecting part 39 through the bent part 41, and further connected externally through the bent part 47. Continue to section 48. The external connection portions 32 and 48 are provided to facilitate connection to external circuit elements such as adjacent secondary windings. In addition, this embodiment is a transformer having a secondary winding of two turns. However, if the combination of the bobbin 10 and the secondary winding 30 is continuously arranged and the external connection portions are connected to each other by soldering or the like. Transformers with even numbers of turns, such as 4 turns, 6 turns, 8 turns, 10 turns, etc., can be obtained.

  Further, the inner peripheral surface 40 of the upper portion 34, the distal end portion 35, the lower portion 36, and the proximal end portion 37 of the winding portion 31 of the first turn is formed on the retaining rib 16 when the secondary winding 30 is attached to the bobbin 10. The outer peripheral surface is formed in a size and shape that can be accommodated. That is, when the secondary winding 30 is mounted on the bobbin 10, the retaining rib 16 is fitted in the first turn winding portion 31 surrounded by the upper portion 34, the distal end portion 35, the lower portion 36, and the proximal end portion 37. The secondary winding 30 can be prevented from falling off the bobbin 10 in the assembly process of the transformer.

  As described above, in the transformer according to the first embodiment, the winding part 31 of the first turn and the winding part 42 of the second turn are connected between the first winding frame part 11 and the second winding frame part 21. The secondary winding 30 can be easily mounted by sandwiching them. Further, when the secondary winding 30 is mounted on the bobbin 10, the retaining rib 16 restricts the movement of the first winding frame portion 11, so that the secondary winding 30 is not easily dropped by a force applied from the outside. Further, since the fixing work for preventing the secondary winding 30 from falling off is unnecessary, the work load is reduced.

  The configuration shown in FIG. 1 and the like is one embodiment of the present invention and is not limited to the shape shown in these drawings. For example, when the primary winding is a strip-shaped conductor, the configuration of the secondary winding 30 may be applied to the primary winding. Further, the retaining rib 16 may be formed in a concave or convex curved surface instead of a tapered surface. Further, when the bobbin 10 is used as a choke coil, the distance between the first winding frame portion 11 and the second winding frame portion 21 can be appropriately adjusted.

[Second Embodiment]
Hereinafter, a transformer according to a second embodiment of the present invention will be described in detail with reference to the drawings. FIG. 7 is a perspective view showing a bobbin according to the second embodiment of the present invention. The reference numerals in FIG. 7 are the same as those in FIGS.

  In the bobbin 10 according to this embodiment, the retaining rib 16 is not provided annularly around the opening of the hollow portion 20 but is provided only in the vicinity of the upper rib 13 and the tip side rib 14. Therefore, when the winding part 31 of the first turn and the winding part 42 of the second turn are sandwiched between the first winding frame part 11 and the second winding frame part 21, the winding part 31 of the first turn And the lower side of the winding part 42 of the second turn is not so open. Therefore, this embodiment can be preferably applied to the case where the secondary winding 30 has high rigidity and the winding portion 31 of the first turn and the winding portion 42 of the second turn are difficult to open. The position where the retaining rib 16 is formed can be changed as appropriate according to the shape of the winding portion 31 of the first turn. For example, it may be formed anywhere as long as it is a part surrounded by the winding part 31 of the first turn, such as a position away from the opening of the hollow part 20.

[Third Embodiment]
Hereinafter, a transformer according to a third embodiment of the present invention will be described in detail with reference to the drawings. FIG. 8 is a perspective view showing a secondary winding mounting method according to the third embodiment of the present invention. In FIG. 8, 50 is a clamping part, 51 is a connection part, The other code | symbol is the same as FIG.

  As for the secondary winding 30 of the transformer according to this embodiment, one turn of the winding corresponds to the first turn of the winding 31 of FIG. 1, but the second turn of FIG. There is no equivalent to 42. Further, a pinching portion 50 is provided instead of the winding portion 42 of the second turn. The clamping part 50 is provided in a part corresponding to the base end part 43 of the winding part 42 of the second turn. Further, when the secondary winding 30 is mounted by moving the secondary winding 30 in the direction of arrow B, the clamping unit 50 abuts the second winding frame unit 21 and pinches the bobbin 10 from the outside together with the winding unit 31 of the first turn. It becomes a state. One end of the connecting portion 51 is continuous with the sandwiching portion 50, and the other end is continuous with the external connection portion 48. Accordingly, the sandwiching portion 50 and the connecting portion 51 are not portions that function as windings, but are for securing the secondary winding 30 and electrical connection with an external device. The bobbin 10 has the same configuration as that shown in FIG.

  As described above, the present invention can be preferably applied to the case where the secondary winding of the transformer has only one turn. Further, in this embodiment, since the holding portion 50 is provided in the secondary winding 30, the bobbin 10 shown in FIG. 1 can be used as it is, that is, the same bobbin is shared for the 1-turn and 2-turn transformers. There is an advantage that you can.

[Fourth Embodiment]
Hereinafter, a transformer according to a third embodiment of the present invention will be described in detail with reference to the drawings. FIG. 9 is a perspective view showing a secondary winding mounting method according to the fourth embodiment of the present invention. The reference numerals in FIG. 9 denote the same elements as in FIG.

  This embodiment has substantially the same configuration as the third embodiment, but the other embodiment is that the tip of the external connection portion 48 is oriented in the same direction as the tip of the external connection portion 32. And different. Therefore, this embodiment is suitable when it is necessary to align the two ends of the secondary winding in the same direction in order to ensure electrical connection with an external device. In addition, it is possible to provide a resin-made pinching portion instead of the pinching portion 50 and further simplify the configuration between the connecting portion 39 and the external connection portion 48. Further, a resin-made pinching portion having the same shape as the winding portion 42 of the second turn may be provided. In addition, although the resin clamping part can be integrated by bonding to the secondary winding 30, other methods such as welding may be used. Further, a method in which the secondary winding 30 is inserted into a hole provided in the sandwiching portion and an adhesive is poured into the hole to bond the vicinity of the contact portion between the sandwiching portion and the secondary winding 30 can be preferably applied. .

  The present invention is not limited to the contents described above, and various modifications can be made to the shape and structure of the bobbin and the secondary winding without departing from the scope described in each claim. is there. In addition, the modified examples of the respective parts described for the transformer according to each embodiment can be preferably applied to the transformers according to other embodiments as long as no structural contradiction occurs. Further, these embodiments can be used as they are as a choke coil if a primary winding is not provided.

The attachment method of the secondary winding concerning the 1st embodiment of the present invention is shown, (a) is a perspective view and (b) is an AA line sectional view. The attachment process of the secondary winding based on the 1st Embodiment of this invention is shown, (a) is an AA sectional view, (b) is a perspective view. It is a perspective view which shows the bobbin which concerns on the 1st Embodiment of this invention. It is a perspective view which shows the bobbin which concerns on the 1st Embodiment of this invention. FIG. 4 shows the bobbin according to the first embodiment of the present invention, wherein (a) is a plan view, (b) is a front view, and (c) is a side view. It is a perspective view which shows the secondary winding which concerns on the 1st Embodiment of this invention. The secondary winding which concerns on the 1st Embodiment of this invention is shown, (a) is a top view, (b) is a front view, (c) is a side view. It is a perspective view which shows the bobbin which concerns on the 2nd Embodiment of this invention. It is a perspective view which shows the mounting method of the secondary winding which concerns on 3rd Embodiment of this invention. It is a perspective view which shows the mounting method of the secondary winding based on 4th Embodiment of this invention. The prior art of the transformer using a strip | belt-shaped conductor is shown, (a) is a perspective view of the strip | belt-shaped conductor used as a primary winding, (b) is the perspective view which mounted | wore the bobbin with the strip | belt-shaped conductor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Bobbin 11 1st winding frame part 12 Winding mounting surface 13 Upper rib 14 Front end side rib 15 Lower rib 16 Stopping rib 17 Base end side terminal block 18 Front end side terminal block 19 Opening part 20 Hollow part 21 2nd winding frame part 22 Upper rib 23 Front end side rib 24 Base end side terminal block 25 Front end side terminal block 26 Winding body portion 27 Terminal 28 Winding mounting surface 29 Opening portion 30 Secondary winding 31 First turn winding portion 32 External connection portion 33 Folding Bent portion 34 Upper portion 35 Tip portion 36 Lower portion 37 Base end portion 38 Bending portion 39 Connecting portion 40 Inner circumferential surface 41 Bending portion 42 Second turn winding portion 43 Base end portion 44 Upper portion 45 Tip portion 46 Lower portion 47 Bending Part 48 external connection part 49 core 50 clamping part 51 connecting part 60 bobbin 61 primary winding 62 terminal 63 winding frame

Claims (5)

In the choke coil provided with a winding formed from a strip-shaped conductor and a bobbin on which the winding is mounted,
The winding includes a first winding portion of one turn, a second winding portion of one turn arranged in parallel with the first winding portion, an end portion of the first winding portion, and the first winding portion. And a connecting portion that connects the ends of the two winding portions, and is mounted by sandwiching the bobbin between the first winding portion and the second winding portion,
The bobbin includes a first mounting surface and a second mounting surface that are in pressure contact with the first winding portion and the second winding portion, respectively, in a state where the winding is mounted. At least one of the second mounting surface and the second mounting surface is a retaining portion of the winding that gradually protrudes from the side where the connecting portion is located at a portion surrounded by the first winding portion or the second winding portion. A choke coil having a portion formed therein. In the choke coil provided with a winding formed from a strip-shaped conductor and a bobbin on which the winding is mounted,
The winding includes a winding part of one turn, a sandwiching part facing the winding part, and a connecting part that connects an end of the winding part and an end of the sandwiching part. The bobbin is inserted between the winding portion and the clamping portion;
The bobbin includes a first mounting surface and a second mounting surface that are in pressure contact with the winding portion and the sandwiching portion in a state where the winding is mounted, and the first mounting surface includes the winding A choke coil characterized in that a retaining portion of the winding that gradually protrudes as the distance from the side where the connecting portion is located is formed at a portion surrounded by the portion. In a transformer including a winding formed from a strip-shaped conductor and a bobbin on which the winding is mounted,
The winding includes a first winding portion of one turn, a second winding portion of one turn arranged in parallel with the first winding portion, an end portion of the first winding portion, and the first winding portion. And a connecting portion that connects the ends of the two winding portions, and is mounted by sandwiching the bobbin between the first winding portion and the second winding portion,
The bobbin includes a first mounting surface and a second mounting surface that are in pressure contact with the first winding portion and the second winding portion, respectively, in a state where the winding is mounted. At least one of the second mounting surface and the second mounting surface is a retaining portion of the winding that gradually protrudes from the side where the connecting portion is located at a portion surrounded by the first winding portion or the second winding portion. Transformer characterized by forming part. In a transformer including a winding formed from a strip-shaped conductor and a bobbin on which the winding is mounted,
The winding includes a winding part of one turn, a sandwiching part facing the winding part, and a connecting part that connects an end of the winding part and an end of the sandwiching part. The bobbin is inserted between the winding portion and the clamping portion;
The bobbin includes a first mounting surface and a second mounting surface that are in pressure contact with the winding portion and the sandwiching portion in a state where the winding is mounted, and the first mounting surface includes the winding The transformer is characterized in that a part of the winding that protrudes gradually as the distance from the side where the connecting part is located is formed in a part surrounded by the part.   The bobbin further includes a winding body portion that connects the first mounting surface and the second mounting surface and winds another winding, and the retaining portion is an end portion of the cylindrical portion. The transformer according to claim 3 or 4.

Images