JP6523626B2 - Trance - Google Patents

Description

  The present invention relates to a transformer of a large current specification in which a pair of plate-like secondary side coils are disposed with a primary side coil interposed therebetween.

  In a high-voltage transformer in which a large current flows in the secondary coil, such as a car power supply transformer, a copper plate coil in which a copper strip plate having a small resistance value is formed in a ring shape in the in-plane direction. The above-mentioned large current is handled by using

  By the way, when using two secondary side copper plate coils as an output side with respect to the primary side coil which wound a copper wire in such a high voltage coil, it is usually seen in the following patent documents 1 As described above, a configuration is adopted in which the copper plate coil is disposed so as to be opposed to each other in the axial direction of the primary side coil so as to sandwich the primary side coil.

FIGS. 10 to 12 show this type of transformer developed by the present inventors.
In this transformer, the secondary side coil 3 in which a copper plate is formed in a link shape is disposed on the outer surfaces of the flanges 2a of both ends of the bobbin 2 around which the primary side coil 1 is wound. The lead-out portions 3a and 3b are each bent to the outer peripheral side of the primary coil 1, and the respective lead-out portions 3a are connected as a common terminal.

  The bobbin 2 and the secondary side coil 3 are housed in a bottomed cylindrical cover 4 in which an opening 4a for drawing out the drawers 3a, 3b is formed in an outer wall, and an end opening of the cover 4 Is closed by a substantially disc-shaped cap 5.

  A pair of E-shaped cores 6 are disposed opposite to each other so as to surround the outer periphery of the cover 4 and the cap 5. These E-shaped cores 6 have their backs 6a disposed on the bottom plate of the cover 4 and the outer surface side of the cap 5, and the middle legs 6b are inserted into the bobbin 2 from the holes formed in the bottom plate of the cover 4 and the cap 5 In addition, the outer foot 6 c is disposed on the outer periphery of the cover 4.

  By the way, in the transformer having the above configuration, as shown in FIG. 11, it is necessary to secure a desired insulation distance between the primary coil 1 and the lead-out portions 3a and 3b of the secondary coil 3. The bent portion of the secondary side coil 3 is separated from the primary side coil 1 to form a lead-out portion 3a. For this reason, there existed a problem that the space for mounting the said transformer will become large.

  In particular, when a stranded wire such as a litz wire is used as the primary side coil 1 as a heat countermeasure, the above-mentioned bent portion is further formed on the primary side coil in consideration of winding and unrolling of the primary side coil 1 in the bobbin 2 It is necessary to keep away from 1 and it has been an obstacle to downsizing.

  Further, in this transformer, the outer peripheral wall 7 is formed on the outer peripheral edge of the flange 2a of the bobbin 2, and the inner peripheral wall 8 is formed on the peripheral edges of the holes of the cover 4 and the cap 5, as shown in FIG. As shown in FIG. 2, the secondary side coil 3 is accommodated between the outer peripheral wall 7 and the inner peripheral wall 8 and positioned.

  However, normally, in the above-mentioned transformer, the dimensional tolerances of the cover 4, the bobbin 2 and the cap 5 which are resin products are piled up, and in the final product, a backlash (gap) is generated between the E-shaped core 6 and the back 6 a. There is. As a result, as shown in FIG. 12 (b), when the cap 5 is lifted due to vibration or shock, the gap S is formed between the bobbin 2 and the inner peripheral wall 8, and the secondary coil 3 There is a possibility that it may drop out of the inner peripheral wall 8 and contact the middle foot 6b.

  Therefore, in order to solve this, the structure of the resin parts such as the cover 4 and the cap 5 is complicated to assemble by taking man-hours, or the secondary side coil 3 is adhered and fixed to the flange 2 a of the bobbin 2 There is also a problem that material cost and assembly man-hours are increased, resulting in high cost.

JP 2008-270347 A

  The present invention has been made in view of the above circumstances, and it is possible to ensure the insulation distance between the primary side coil and the secondary side coil reliably by a simple structure, and to achieve further miniaturization. The task is to provide a transformer that

In order to solve the above problems, the invention according to claim 1 is a bobbin having flanges at both ends and an inner circumferential surface forming a hole, a primary coil wound around the bobbin, and flanges at both ends of the bobbin And a pair of E-shaped cores surrounding the primary coil and the secondary coil to form a magnetic path, and the lead-out portion of the secondary coil is provided. in transformer drawn on the outer peripheral side of the primary coil, the first spacer and the upper Symbol E-shaped core provided along the outer peripheral portion of the primary coil opposed to the lead portion of the secondary coil And a rib for preventing the secondary coil from coming into contact with each other, the rib extending between the middle foot of the E-shaped core and the secondary coil, and Inserted into the hole of the bobbin And it is characterized in Rukoto.
The invention according to claim 2 is a bobbin having an end flange and an inner peripheral surface forming a hole, a primary coil wound around the bobbin, and an outer surface of the end flange of the bobbin. The secondary side coil and the pair of E-shaped cores which enclose the primary side coil and the secondary side coil to form a magnetic path, and the lead-out portion of the secondary side coil is the primary side coil In the transformer drawn out to the outer peripheral side, a first spacer provided along the outer peripheral portion of the primary coil facing the lead-out portion of the secondary coil and inserted into the hole of the bobbin And a rib for preventing contact between the middle foot of the E-shaped core and the secondary coil, and the bobbin and the secondary coil are for drawing the lead-out portion of the primary coil to the outer wall. Opening Is housed inside a bottomed cylindrical cover having a bottom plate in which a hole for inserting the middle foot of the E-shaped core is formed in the bottom plate, and the end opening of the cover is the middle foot of the E-shaped core Is closed by a cap formed with a hole into which a hole is inserted, and a cylindrical above-mentioned tubular member which protrudes to the space between the bobbin and the middle foot at the peripheral portion of the hole of the cover and cap The rib is characterized in that it is integrally formed.

Here, in the invention according to claim 3 , in the invention according to claim 1 or 2 , the lead-out portion of the primary side coil and the secondary side coil is from the outer foot to the back of the E-shaped core. While being pulled out on the opposite side, the first spacer is characterized in that it is formed so as to be able to sandwich the outer peripheral portion of the primary side coil by an elastic force.

On the other hand, in the invention according to claim 4 , in the invention according to claim 1 or 2 , the lead-out portions of the primary coil and the secondary coil are the same from the outer foot to the back of the E-shaped core. And a second spacer capable of holding the outer peripheral portion of the primary coil by an elastic force at a portion which is pulled out to the side and which is an outer peripheral portion of the primary coil and in which the first spacer is not provided. Are provided.

  According to the invention as set forth in any one of claims 1 to 4, an arc plate-shaped first spacer is provided along the outer periphery of the primary coil on the outer peripheral portion of the primary coil facing the lead-out portion of the secondary coil. Thus, a desired insulation distance can be reliably ensured between the primary coil and the secondary coil.

  As a result, even when one lead-out portion of the pair of secondary side coils is connected as a common terminal, there is no need to move the bent portion of the lead-out portion in the outer circumferential direction of the primary side coil away from the primary side coil. The simple structure makes it possible to reduce the mounting space by miniaturizing the transformer itself.

In addition, according to the third aspect of the present invention, in the case where the lead-out portions of the primary coil and the secondary coil are drawn from between the outer feet of the E-shaped core to the opposite side to the back, While the above-mentioned insulation distance can be secured by the spacer of 1, and the peripheral part of the primary side coil is held by the elastic force, winding thickness and unrolling when using a stranded wire such as litz wire as the primary side coil Can be prevented.

On the other hand, when the lead-out portions of the primary side coil and the secondary side coil are drawn to the same side with respect to the back from between the outer legs of the E-shaped core, the first spacer and the primary side coil Because of interference with the lead portion, it is difficult to form the first coil in such a shape that the outer peripheral portion of the primary coil can be held by elastic force. In this respect, according to the invention as set forth in claim 4 , the insulation distance can be secured by the first spacer, and the second spacer is provided at a portion where the first spacer is not provided. It is possible to prevent the winding and unwinding of the primary coil.

Furthermore, in the invention according to claim 2 , in the periphery of the hole for inserting the middle foot of the E-shaped core of the cover and the cap that accommodates the bobbin and the secondary side coil, the middle foot and the secondary side coil Since the cylindrical rib extending to the space between the above midfoot and the bobbin through the gap is integrally formed, even when the cap is lifted due to vibration or the like due to the play due to the buildup of the dimensional tolerance, It is possible to prevent the secondary coil from falling off and coming into contact with the middle foot.

It is a disassembled perspective view which shows the 1st Embodiment of this invention. It is a top view of 1st Embodiment. (A) is the sectional view on the AA line of FIG. 2, (b) is a figure which shows the state which the cap of (a) floated up. It is a BB sectional view taken on the line of FIG. It is a disassembled perspective view which shows the 2nd Embodiment of this invention. It is a top view of 2nd Embodiment. It is CC sectional view taken on the line of FIG. It is a front view of the principal part of FIG. (A) is the DD sectional view taken on the line of FIG. 6, (b) is a figure which shows the state which the cap of (a) floated up. It is a disassembled perspective view which shows the conventional transformer. It is the longitudinal cross-sectional view which looked at the XX of FIG. (A) is a longitudinal cross-sectional view which looked at the YY line of FIG. 10, (b) is a figure which shows the state which the cap of (a) floated up.

First Embodiment
FIGS. 1 to 4 show a first embodiment of a transformer according to the present invention, and the same reference numerals as in FIG. 10 to FIG. 12 denote the same parts as in the transformer shown in FIGS.
In these drawings, in the transformer of the present embodiment, the secondary coil 3 in which a copper plate is formed in a link shape is disposed on the outer surfaces of the flanges 2a of both ends of the bobbin 2 on which the primary coil 1 is wound. A set of units is housed in the cover 4 with an annular plate-shaped insulator 10 interposed therebetween.

  In this transformer, the lead portions 1a and 1b of the primary coil 1 and the lead portions 3a and 3b of the secondary coil 3 are between the outer legs 6c of the E-shaped core 6 and on the opposite side to the back 6a. It is pulled out. In the upper unit of the two sets of units, the lead-out portions 3a and 3b of the secondary coil 3 disposed on the upper surface of the bobbin 2 are bent toward the outer periphery of the primary coil 1, and In the unit on the side, the lead portions 3 a and 3 b of the secondary coil 3 disposed on the lower surface of the bobbin 2 are bent to the outer peripheral side of the primary coil 1.

  Then, on the outer periphery of the primary side coil 1 facing the lead-out portions 3a and 3b of the secondary side coil 3, a first spacer 11 is provided over about a half circumference. The first spacer 11 is made of an insulating synthetic resin having elasticity, and has a substantially horseshoe shape in which the dimension between the tip portions before attachment is smaller than the external dimension at the corresponding portion of the primary side coil 1 It is formed. The tip of the first spacer 11 is pushed and expanded, and the first spacer 11 is fitted to the outer periphery of the primary coil 1. Thus, the first spacer 11 is attached in a state in which the outer peripheral portion of the primary coil 1 is held by the elastic force. Further, on the outer peripheral surface of the first spacer 11, a projection 11a for securing a predetermined insulation distance between the lead-out portions 3a and 3b is integrally formed.

  Furthermore, in the bottom plate of the cover 4 into which the middle foot 6b of the E-shaped core 6 is inserted, and in the peripheral portion of the hole formed in the insulator 10 and the cap 5, between the middle foot 6b and the secondary coil 3 A cylindrical rib 12 is integrally formed to extend between the middle foot 6 b and the bobbin 2.

  Here, the rib 12 has a cap 5 and an E-shaped core 6 that are assumed to be at least the tip of the rib 12 and the inner circumferential surface of the bobbin 2 by stacking dimensional tolerances of resin components such as the bobbin 2, the cover 4 and the insulator 10. The gap between the two or more is formed in the length dimension which overlaps in length.

  According to the transformer having the above configuration, the outer peripheral portion of the primary coil 1 facing the lead-out portions 3a and 3b of the secondary coil 3 has an arc plate shape covering approximately 1⁄2 of the outer periphery of the primary coil 1. Since the first spacer 11 is provided, a desired insulation distance can be reliably ensured between the primary side coil 1 and the secondary side coil 3.

  As a result, even when one lead portion 3a of the pair of secondary coils 3 is connected as a common terminal, the bent portion of the lead portions 3a and 3b in the outer circumferential direction of the primary coil 1 is from the primary coil 1 There is no need to move away. Therefore, with a simple structure such as the mounting of the first spacer 11, it is possible to narrow the mounting space by miniaturizing the transformer itself.

  Furthermore, since the first spacer 11 is formed in a substantially horseshoe shape capable of holding the outer peripheral portion of the primary side coil 1 by its elastic force, the insulation distance described above is secured and the primary side coil 1 is made elastic. By pinching the outer peripheral portion of the coil, it is possible to prevent the winding and unrolling of the primary coil 1 as well.

  In addition, as shown in FIG. 3A, in the periphery of the hole for inserting the middle foot 6b of the E-shaped core 6 formed in the bottom plate of the cover 4, the insulator 10 and the cap 5, the middle foot 6b Since the cylindrical rib 12 extending integrally between the middle foot 6b and the bobbin 2 through the gap between the second side coil 3 and the second side coil 3 is integrally formed, As shown in FIG. 3 (b), even when the cap 5 is lifted due to vibration or the like, no gap is generated on the inner peripheral side of the secondary coil 3, and the secondary coil 3 is in contact with the middle foot 6b. Can be prevented.

Second Embodiment
5 to 9 show a second embodiment of the present invention, and the same reference numerals are given to the same components as the first embodiment shown in FIG. 1 to FIG. Simplify
In this transformer, the lead-out portions 1a and 1b of the primary side coil 1 and the lead-out portions 3a and 3b of the secondary side coil 3 are drawn between the outer legs 6c of the E-shaped core 6 on the same side with respect to the back portion 6a. It is done. Similarly, in the upper unit of the two sets of units, the lead-out portions 3a and 3b of the secondary coil 3 disposed on the upper surface of the bobbin 2 are bent toward the outer periphery of the primary coil 1 In the lower unit, the lead portions 3 a and 3 b of the secondary coil 3 disposed on the lower surface of the bobbin 2 are bent to the outer peripheral side of the primary coil 1.

  Further, the lead portions 1 a and 1 b of the primary coil 1 are drawn in the tangential direction between the lead portions 3 a and 3 b of the secondary coil 3 and the outer leg 6 c of the E-shaped core 6 respectively. Thus, the lead portions 1a and 1b are orthogonal to each other in plan view, and one lead portion 1a extends in parallel with the lead portions 3a and 3b of the secondary coil 3, and the other lead portion 1b is the lead portion It is arranged to extend in a direction away from 3a, 3b.

  A first spacer 20 is provided on the outer periphery of the primary coil 1 facing the lead-out portions 3a and 3b of the secondary coil 3. The first spacer 20 is formed of an insulating synthetic resin, and is disposed on the outer periphery of the primary coil 1 in a range from the position of the lead portion 1a to the outer leg 6c on the opposite side. There is.

  Here, the bobbin 2 around which the primary side coil 1 is wound has two winding sections by integrally forming the partition plate 2b between the flanges 2a, and one winding is performed on the partition plate 2b. A notch 2c is formed for passing the wire wound around the wire section to the other winding section. On the other hand, the first spacer 20 is formed with a groove portion 20a into which the partition plate 2b of the bobbin 2 is inserted, and a fitting portion 20b for dividing the groove portion 20a is formed at the center of the groove portion 20a. .

Then, in the first spacer 20, the partition plate 2b of the bobbin 2 is inserted into the groove portion 20a, and the fitting portion 20b is fitted to the notch portion 2c of the partition plate 2b , thereby the primary coil 1 is obtained. It is attached to the bobbin 2 so as to cover it. In addition, a second spacer 21 similar to the first spacer 11 in the first embodiment is provided in the outer peripheral portion of the primary coil 1 and in the portion where the first spacer 20 is not provided. There is.

  Furthermore, in this transformer, when assembling the cover 4 and the cap 5, the lead portions 1a and 1b are positioned at the positions of the lead portions 1a and 1b of the primary side coil 1, and the secondary side coil 3 is drawn. A third spacer 22 is provided to secure an insulation distance between the portions 3a and 3b.

  The third spacer 22 includes a top plate 23 continuous to the cap 5, a bottom plate 24 continuous to the bottom plate of the cover 4, a side plate 25 orthogonal to the lead portion 1b, and a front plate 26 orthogonal to the lead portion 1a. The side plate 25 is formed with a vertical groove 25 a to be inserted, and the front plate 26 is formed with a vertical groove 26 a.

  In the third spacer 22, the upper portion on the secondary side coil 3 side of the top plate 23 and the vertical groove 26 a of the front plate 26 is integrally formed with the cap 5, and the other portion is integrally formed with the cover 4. There is. The lead-out portion 1 b is inserted into the vertical groove 25 a of the side plate 25, and the lead-out portion 1 a is inserted into the vertical groove 26 a of the front plate 26.

  In the transformer of the second embodiment having the above configuration, the insulation distance between the primary coil 1 and the secondary coil 3 can be secured by the first spacer 20, and the first spacer 20 The second spacer 21 provided in a portion not provided can prevent the winding and unrolling of the primary side coil 1. As a result, it is possible to obtain the same effects as those described in the first embodiment.

  Furthermore, according to the transformer of the second embodiment, the partition plate 2b of the bobbin 2 is inserted into the groove portion 20a of the first spacer 20, and the fitting portion 20b is fitted to the notch portion 2c of the partition plate 2b. By fitting the first spacer 20 to the bobbin 2, the first spacer 20 can prevent the bobbin 2 from rotating about the axis.

  In addition to this, the third spacer 22 is integrally formed on the case 4 and the cap 5, and the lead-out portion 1b is inserted into the vertical groove 25a of the side plate 25 and the lead-out portion 1a is inserted into the vertical groove 26a of the front plate 26. Because of this, a desired insulation distance can be secured between the lead portions 1 a and 1 b of the primary coil 1 and the lead portions 3 a and 3 b of the secondary coil 3.

  Thus, in the transformer of the second embodiment, the lead portions 1a and 1b of the primary coil 1 and the lead portions 3a and 3b of the secondary coil 3 are drawn from the E-shaped core 6 to the same side. Also in the case where there is an insulation distance between the primary coil 1 and the secondary coil 3, the insulation distance can be ensured.

Reference Signs List 1 primary coil 1a, 1b primary coil extraction 2 bobbin 3 secondary coil 3a, 3b secondary coil extraction 4 cover 4a opening 5 cap 6 E core 6a back 6b middle foot 6c outer foot 11 , 20 first spacer 12 rib 21 second spacer

Claims (4)

A bobbin having flanges at both ends and an inner circumferential surface forming a hole;
A primary coil wound around the bobbin;
A secondary coil disposed on each of the outer surfaces of the flanges at both ends of the bobbin;
A pair of E-shaped cores surrounding the primary coil and the secondary coil to form a magnetic path;
In a transformer in which the lead-out portion of the secondary coil is drawn to the outer peripheral side of the primary coil,
A first spacer provided along an outer peripheral portion of the primary coil facing the lead-out portion of the secondary coil;
Anda rib and feet and the secondary coil in the upper Symbol E-shaped core can be prevented from contacting,
The rib extends between the foot and the secondary coil in the E-type core, and the transformer, characterized that you have been inserted into the hole of the bobbin. A bobbin having flanges at both ends and an inner circumferential surface forming a hole;
A primary coil wound around the bobbin;
A secondary coil disposed on each of the outer surfaces of the flanges at both ends of the bobbin;
A pair of E-shaped cores surrounding the primary coil and the secondary coil to form a magnetic path;
In a transformer in which the lead-out portion of the secondary coil is drawn to the outer peripheral side of the primary coil,
A first spacer provided along an outer peripheral portion of the primary coil facing the lead-out portion of the secondary coil;
The rib further includes: a rib inserted in the hole of the bobbin and preventing contact between the middle foot of the E-shaped core and the secondary coil;
The bobbin and the secondary coil have a bottom with an opening formed on the outer wall for drawing the lead-out portion of the primary coil and a hole into which the middle foot of the E-shaped core is inserted in the bottom plate The end opening of the cover is closed by a cap formed with a hole into which the middle foot of the E-shaped core is inserted, and the hole of the cover and the cap is housed inside a cylindrical cover A transformer characterized in that a cylindrical rib which protrudes to the space between the bobbin and the middle foot is integrally formed on a peripheral edge portion of the portion. The lead-out portions of the primary coil and the secondary coil are drawn to the opposite side with respect to the back from between the outer feet of the E-shaped core,
The transformer according to claim 1 or 2 , wherein the first spacer is formed so as to be able to sandwich the outer peripheral portion of the primary coil by an elastic force. The lead-out portions of the primary coil and the secondary coil are drawn to the same side with respect to the back from between the outer feet of the E-shaped core,
A second spacer which can hold the outer peripheral portion of the primary coil by an elastic force is provided on the outer peripheral portion of the primary coil where the first spacer is not provided. The transformer according to claim 1 or 2 .

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