JP2016032069A - Transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transformer capable of securing an insulation distance between a primary-side coil and a secondary-side coil surely in simple structure and also attaining further downsizing.SOLUTION: In the transformer, on an outer surface of a double-end flange 2a of a bobbin 2 around which a primary-side coil 1 is wound, a secondary-side coil 3 is disposed, respectively, and a core 6 is disposed that forms a magnetic path by surrounding the primary-side coil 1 and the secondary-side coil 3. Lead-out parts 3a and 3b of the secondary-side coil 3 are led out to an outer peripheral side of the primary-side coil 1, respectively. In an outer peripheral portion of the primary-side coil 1 confronting the lead-out parts 3a and 3b of the secondary-side coil 3, a first spacer 11 in the shape of an arcuate plate is provided along the outer periphery of the primary-side coil 1.SELECTED DRAWING: Figure 1

Description

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

  In a high-voltage transformer in which a large current flows through a secondary coil such as a power transformer for a vehicle, a copper plate coil in which a copper strip having a small resistance value is formed in a ring shape in the in-plane direction is usually used as the coil. This is used to cope with the increase in current.

  By the way, in such a high-voltage coil, in which two secondary copper plate coils are used as the output side with respect to the primary coil in which a copper wire is wound around a bobbin, it is usually found in Patent Document 1 below. As described above, a configuration is adopted in which the copper plate coils are arranged opposite to each other on both axial sides of the primary side coil with the primary side coil interposed therebetween.

10 to 12 show this kind of transformer developed previously by the present inventors.
In this transformer, secondary coils 3 each having a copper plate formed in a link shape are arranged on the outer surfaces of both end flanges 2a of the bobbin 2 around which the primary coil 1 is wound. The lead portions 3a and 3b are each bent toward the outer peripheral side of the primary coil 1, and the lead portions 3a are connected as a common terminal.

  The bobbin 2 and the secondary coil 3 are accommodated in a bottomed cylindrical cover 4 in which an opening 4a for pulling out the lead portions 3a and 3b is formed on the outer wall, and the end opening of the cover 4 is opened. Is closed by a substantially disk-shaped cap 5.

  A pair of E-shaped cores 6 are arranged to face each other so as to surround the outer periphery of the cover 4 and the cap 5. These E-shaped cores 6 have their back portions 6 a disposed on the outer surface side of the bottom plate of the cover 4 and the cap 5, and the middle legs 6 b are inserted into the bobbin 2 through holes formed in the bottom plate of the cover 4 and the cap 5. At the same time, the outer leg 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 side coil 1 and the lead portions 3 a and 3 b of the secondary side coil 3. The lead portion 3 a is formed by keeping the bent portion of the secondary coil 3 away from the primary coil 1. Therefore, there is a problem that a space for mounting the transformer becomes large.

  In particular, when a twisted wire such as a litz wire is used for the primary side coil 1 as a heat countermeasure, the bent portion is further made into a primary side coil in consideration of the winding and rewinding of the primary side coil 1 in the bobbin 2. It was necessary to keep away from 1, which was an impediment to downsizing.

  Further, in this transformer, an outer peripheral wall 7 is formed at the outer peripheral edge of the flange 2a of the bobbin 2, and an inner peripheral wall 8 is formed at the peripheral edge of the hole portion of the cover 4 and the cap 5, FIG. 2, the secondary coil 3 is accommodated between the outer peripheral wall 7 and the inner peripheral wall 8 and positioned.

  However, in the above-described transformer, usually, due to accumulation of dimensional tolerances of the cover 4, the bobbin 2, and the cap 5 which are resin products, a backlash (gap) is generated between the back portion 6a of the E-type core 6 in the final product. Yes. As a result, as shown in FIG. 12B, when the cap 5 is lifted by vibration or impact, a gap S is formed between the bobbin 2 and the inner peripheral wall 8, and the secondary side coil 3. May fall off the inner peripheral wall 8 and come into contact with the middle leg 6b.

  Therefore, in order to solve this problem, the structure of the resin parts such as the cover 4 and the cap 5 is complicated to assemble, or the secondary coil 3 is bonded and fixed to the flange 2a of the bobbin 2 or the like. Measures to be taken have been taken, and there has also been a problem that the material cost and assembly man-hours increase, resulting in high costs.

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 with a simple structure, and to further reduce the size. It is an object to provide a transformer that becomes.

  In order to solve the above problems, the invention according to claim 1 is characterized in that secondary coils are arranged on the outer surfaces of both end flanges of the bobbin around which the primary coil is wound, and these primary coil and secondary coil are arranged. In the transformer in which a core that forms a magnetic path is disposed so as to surround the secondary coil, and the lead-out part of the secondary-side coil is a transformer in which the lead-out part of the secondary-side coil is drawn out to the outer peripheral side of the primary coil. An arc plate-like first spacer is provided along the outer periphery of the primary side coil on the outer peripheral portion of the primary side coil facing the surface.

  The invention according to claim 2 is the invention according to claim 1, wherein the core is a pair of E-type cores, and the lead-out portions of the primary side coil and the secondary side coil are the E The first spacer is drawn out from between the outer legs of the mold core to the back side, and the first spacer is formed so as to be able to sandwich the outer peripheral portion of the primary coil by elastic force. Is.

  On the other hand, the invention according to claim 3 is the invention according to claim 1, wherein the core is a pair of E-type cores, and the lead-out portions of the primary side coil and the secondary side coil are the E type. The primary side coil is pulled out to the same side with respect to the back part from between the outer legs of the core and is provided on the outer peripheral part of the primary side coil without the first spacer by elastic force. A second spacer capable of sandwiching the outer peripheral portion of the second spacer is provided.

  Furthermore, the invention according to claim 4 is the invention according to claim 2 or 3, wherein the bobbin and the secondary side coil are formed with an opening for pulling out the lead-out portion on the outer wall, and the bottom plate has the above-described feature. It is housed in a bottomed cylindrical cover in which a hole for inserting the middle leg of the E-type core is formed, and an end part of the cover forms a hole for inserting the middle leg of the E-type core. A cylindrical rib that protrudes between the bobbin and the middle foot is integrally formed at the peripheral edge of the hole of the cover and the cap. It is characterized by this.

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

  As a result, even when one lead portion of the pair of secondary coils is connected as a common terminal, it is not necessary to keep the bent portion in the outer peripheral direction of the primary coil in the lead portion away from the primary coil. With a simple structure, it becomes possible to reduce the mounting space by reducing the size of the transformer itself.

  In addition, according to the invention described in claim 2, when the lead-out portions of the primary side coil and the secondary side coil are drawn out from between the outer legs of the E-type core to the opposite side with respect to the back portion, The above-mentioned insulation distance can be ensured by one spacer, and the outer peripheral portion of the primary side coil is sandwiched by elastic force, so that winding or rewinding when using a stranded wire such as a litz wire as the primary side coil Can be prevented.

  On the other hand, when the lead portions of the primary side coil and the secondary side coil are drawn to the same side with respect to the back portion from between the outer legs of the E-type core, the first spacer and the primary side coil Since the lead portion interferes, it is difficult to form the first coil into a shape that can hold the outer peripheral portion of the primary coil by elastic force. In this regard, according to the third aspect of the invention, the insulation distance can be secured by the first spacer, and the second spacer provided in a portion where the first spacer is not provided. It is possible to prevent the primary side coil from being thickened or unwound.

  Furthermore, in the invention according to claim 4, the cover of the bobbin and the secondary side coil and the peripheral part of the hole for inserting the middle leg of the E-shaped core of the cap are connected to the middle leg and the secondary side coil. Since the cylindrical rib extending to the middle leg and the bobbin is formed integrally with the gap between the middle leg and the bobbin, even when the cap is lifted by vibration or the like due to backlash due to accumulation of dimensional tolerance, It is possible to prevent the secondary coil from falling off and coming into contact with the middle leg.

1 is an exploded perspective view showing a first embodiment of the present invention. It is a top view of a 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. FIG. 3 is a sectional view taken along line B-B in FIG. 2. It is a disassembled perspective view which shows the 2nd Embodiment of this invention. It is a top view of a 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. It is a disassembled perspective view which shows the conventional transformer. It is the longitudinal cross-sectional view seen in the XX line of FIG. (A) is the longitudinal cross-sectional view seen in the YY line of FIG. 10, (b) is a figure which shows the state which the cap of (a) floated.

(First embodiment)
1 to 4 show a first embodiment of a transformer according to the present invention. Components common to those shown in FIGS. 10 to 12 are denoted by the same reference numerals.
In these figures, in the transformer of the present embodiment, secondary coils 3 each having a copper plate formed in a link shape are arranged on the outer surfaces of both end flanges 2a of the bobbin 2 around which the primary coil 1 is wound. A set of units is accommodated in the cover 4 with an annular plate-like 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-type core 6 and on the opposite side to the back portion 6a. Has been pulled out. Of the two sets of units, in the upper unit, 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 peripheral side of the primary coil 1 and In the side unit, the lead-out portions 3 a and 3 b of the secondary coil 3 disposed on the lower surface of the bobbin 2 are bent toward the outer peripheral side of the primary coil 1.

  And the 1st spacer 11 is provided in the outer periphery of the primary side coil 1 facing the drawer | drawing-out parts 3a and 3b of the secondary side coil 3 over about 1/2 circumference. The first spacer 11 is formed of an insulating synthetic resin having elasticity, and has a substantially horseshoe shape in which the dimension between the front end portions before attachment is smaller than the outer dimension at the corresponding portion of the primary coil 1. Is formed. The first spacer 11 is fitted to the outer periphery of the primary coil 1 with its tip portion expanded. Thereby, the 1st spacer 11 is attached in the state which pinched | interposed the outer peripheral part of the primary side coil 1 with the elastic force. Further, on the outer peripheral surface of the first spacer 11, a protruding portion 11a for securing a predetermined insulating distance is formed integrally with the lead portions 3a and 3b.

  Furthermore, the bottom plate of the cover 4 into which the middle legs 6b of the E-type core 6 are inserted, the peripheral portions of the holes formed in the insulator 10 and the cap 5 are respectively spaced between the middle legs 6b and the secondary coil 3. A cylindrical rib 12 extending to the middle leg 6b and the bobbin 2 is integrally formed.

  Here, the rib 12 has a cap 5 and an E-shaped core 6 that are assumed to have at least a tip portion thereof and an inner peripheral surface of the bobbin 2 due to accumulation of dimensional tolerances of resin parts such as the bobbin 2, the cover 4, and the insulator 10. It is formed in the length dimension which overlaps the length more than the clearance gap between.

  According to the transformer having the above-described configuration, the outer peripheral portion of the primary side coil 1 facing the lead portions 3a and 3b of the secondary side coil 3 is in the shape of an arc plate that covers about 1/2 of the outer periphery of the primary side 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 in the outer peripheral direction of the primary coil 1 in the lead portions 3a and 3b is separated from the primary coil 1. There is no need to keep away. For this reason, the mounting space can be reduced by downsizing the transformer itself with a simple structure such as mounting the first spacer 11.

  Further, since the first spacer 11 is formed in a substantially horseshoe shape capable of sandwiching the outer peripheral portion of the primary coil 1 by its elastic force, the primary coil 1 is secured by the elastic force as well as securing the above-described insulation distance. By sandwiching the outer peripheral portion of the coil, it is possible to prevent the primary coil 1 from being thickened or unwound.

  In addition, as shown in FIG. 3 (a), the middle foot 6 b is formed at the peripheral portion of the hole for inserting the middle foot 6 b of the E-shaped core 6 formed in the bottom plate of the cover 4, the insulator 10 and the cap 5. Since the cylindrical ribs 12 extending between the intermediate leg 6b and the bobbin 2 through the intermediate coil 6 and the secondary coil 3 are integrally formed, the backlash due to accumulation of dimensional tolerances causes 3 (b), even when the cap 5 is lifted by vibration or the like, there is no gap on the inner peripheral side of the secondary side coil 3, so that the secondary side coil 3 is in contact with the middle foot 6b. Can be prevented.

(Second Embodiment)
FIGS. 5 to 9 show a second embodiment of the present invention. The same components as those in the first embodiment shown in FIGS. To simplify.
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 drawn between the outer legs 6c of the E-type core 6 and on the same side with respect to the back portion 6a. It is. Similarly, in the upper unit of the above 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 to the outer peripheral side of the primary coil 1. In the lower unit, the lead-out portions 3 a and 3 b of the secondary coil 3 disposed on the lower surface of the bobbin 2 are bent toward 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 a tangential direction between the lead portions 3 a and 3 b of the secondary coil 3 and one outer leg 6 c of the E-type core 6. Thereby, 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 arrange | positions so that it may extend in the direction away from 3a, 3b.

  And the 1st spacer 20 is provided in the outer periphery of the primary side coil 1 facing the drawer | drawing-out parts 3a and 3b of the secondary side coil 3. FIG. The first spacer 20 is formed of an insulating synthetic resin, and is disposed in the outer peripheral portion 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. Yes.

  Here, the bobbin 2 around which the primary coil 1 is wound has two winding sections by integrally forming the partition plate 2b between the flanges 2a, and the partition plate 2b has one winding. 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 has a groove 20a into which the partition plate 2b of the bobbin 2 is inserted, and a fitting portion 20b that divides the groove 20a is formed at the center of the groove 20a. .

  The first spacer 20 is configured such that the partition plate 20b 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 20b, whereby the primary coil 1 is It is attached to the bobbin 2 so as to cover it. Further, a second spacer 21 similar to the first spacer 11 in the first embodiment is provided on the outer peripheral portion of the primary coil 1 where the first spacer 20 is not provided. Yes.

  Further, in this transformer, when the cover 4 and the cap 5 are assembled to each other, the lead portions 1a and 1b are positioned at the positions of the lead portions 1a and 1b of the primary coil 1 and the secondary coil 3 is drawn. A third spacer 22 is provided for securing an insulation distance between the portions 3a and 3b.

  The third spacer 22 includes a top plate 23 continuing to the cap 5, a bottom plate 24 continuing to the bottom plate of the cover 4, a side plate 25 orthogonal to the drawer portion 1b, and a front plate 26 orthogonal to the drawer portion 1a. It is formed in a box shape, and a vertical groove 25a is formed in the side plate 25, and a vertical groove 26a is formed in the front plate 26.

  The third spacer 22 is formed such that the upper part on the secondary coil 3 side is formed integrally with the cap 5 with respect to the vertical groove 26a of the top plate 23 and the front plate 26, and the other part is formed integrally with the cover 4. Yes. The drawer portion 1 b is inserted into the vertical groove 25 a of the side plate 25, and the drawer portion 1 a is inserted into the vertical groove 26 a of the front plate 26.

  In the transformer of the second embodiment configured as described above, the first spacer 20 can secure an insulation distance between the primary side coil 1 and the secondary side coil 3, and the first spacer 20 It is possible to prevent the primary coil 1 from being thickened or unwound by the second spacer 21 provided in the portion where it is not provided. As a result, the same effects as those shown in the first embodiment can be obtained.

  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 into the notch portion 2c of the partition plate 2b. By combining the first spacer 20 and the bobbin 2, the bobbin 2 can be prevented from rotating around the axis by the first spacer 20.

  In addition, the third spacer 22 is formed integrally with the case 4 and the cap 5, and the drawer portion 1 b is inserted into the vertical groove 25 a of the side plate 25, and the drawer portion 1 a is inserted into the vertical groove 26 a of the front plate 26. Therefore, a desired insulation distance can be ensured between the lead portions 1a and 1b of the primary side coil 1 and the lead portions 3a and 3b of the secondary side 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-type core 6 to the same side. Even in the case, the insulation distance between the primary side coil 1 and the secondary side coil 3 can be ensured reliably.

DESCRIPTION OF SYMBOLS 1 Primary coil 1a, 1b Primary coil drawer part 2 Bobbin 3 Secondary coil 3a, 3b Secondary coil drawer part 4 Cover 4a Opening part 5 Cap 6 E-type core 6a Back part 6b Middle leg 6c Outer leg 11 , 20 First spacer 12 Rib 21 Second spacer

Claims (4)

A secondary coil is disposed on the outer surface of both end flanges of the bobbin around which the primary coil is wound, and a core that surrounds the primary coil and the secondary coil to form a magnetic path is disposed. In the transformer in which the lead-out portions of the secondary side coils are each drawn out to the outer peripheral side of the primary side coil,
A transformer having a circular arc plate-like first spacer provided along an outer periphery of the primary side coil on an outer peripheral portion of the primary side coil facing the lead-out portion of the secondary side coil. The core is a pair of E-type cores, and the lead-out portions of the primary side coil and the secondary side coil are drawn out from between the outer legs of the E-type core to the opposite side, and
2. The transformer according to claim 1, wherein the first spacer is formed so as to be able to sandwich an outer peripheral portion of the primary coil by an elastic force. The core is a pair of E-type cores, and the lead 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 type core,
A second spacer capable of sandwiching the outer peripheral portion of the primary coil by an elastic force is provided at a portion of the outer peripheral portion of the primary coil that is not provided with the first spacer. The transformer according to claim 1.   The bobbin and the secondary coil have a bottomed cylindrical cover in which an opening for pulling out the lead-out portion is formed on the outer wall and a hole for inserting the middle leg of the E-shaped core is formed in the bottom plate The end opening of the cover is closed by a cap in which a hole for inserting the middle leg of the E-type core is formed, and the peripheral edge of the hole of the cover and the cap 4. The transformer according to claim 2, wherein a cylindrical rib that protrudes between the bobbin and the middle leg is integrally formed.

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