JP3054397U - Coil bobbin, transformer case and transformer - Google Patents

Abstract

(57) [Abstract] [Object] To secure a gap between a pair of cores without using a gap spacer and reduce the manufacturing cost of a flyback transformer. A coil part bobbin 210 according to the present invention is manufactured by providing a spacer part 220 on the inner wall of a cylindrical part 211, and a conductive wire 270 is wound thereon to obtain a low-voltage coil 200. Further, the spacer portion 32 is provided on the outer wall of the cylindrical portion 311 via the arm portion 330.
The coil bobbin 310 according to the present invention is manufactured by providing 0, and the conductive wire 370 is wound to obtain the high-voltage coil 300.
After inserting the low-voltage coil 200 into the cylindrical portion 311 of the high-voltage coil 300, one of the leg portions 1 of the pair of cores 100
10a is inserted into the cylindrical part 211 of the low-voltage coil 200 from above and below, and the spacer part 220 is sandwiched between the leg parts 100a. The spacer portion 320 is sandwiched between the remaining leg portions 100b to obtain a transformer B according to the present invention, which is a flyback transformer.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a bobbin for a coil, a transformer case, and a transformer. Specifically, the present invention relates to a configuration of a spacer inserted into a gap in a transformer using a core having a gap, such as a flyback transformer used in a high-voltage generating circuit of a television receiver.

[0002]

[Prior art]

 FIG. 10 is a schematic structural diagram of a conventional flyback transformer. The flyback transformer F generally includes a pair of substantially U-shaped cores 100 that form a magnetic path, a low-voltage coil 200, a high-voltage coil 300, a high-voltage rectifier circuit (not shown), and the like. As shown, a low-voltage coil 200 is formed by winding a conductive wire 270 around a substantially cylindrical low-voltage coil bobbin 260, and a substantially cylindrical high-voltage coil bobbin 360 is formed around the low-voltage coil 200. The high voltage coil 300 formed by winding the wire 370 is arranged.

[0005] The low-voltage coil bobbin 260 includes a cylindrical portion 261 around which the conductive wire 270 is wound and a terminal portion 262, and is integrally formed from an insulating material such as a resin. The terminal portion 262 is provided with two pairs of terminals 263 and 264 each having an end protruding outside the transformer case 400, and the conductive wire 270 of the low-voltage coil 200 is connected to one of the pair of terminals 263. The conductive wire 370 of the high voltage coil 300 is connected to the remaining pair of terminals 264. Further, the terminal portion 262 is made large enough to support the high voltage coil 300 arranged on the outer periphery.

[0004] The high-voltage coil bobbin 360 also includes a cylindrical portion 361 around which the conductive wire 370 is wound and a terminal portion 362, and is integrally formed from an insulating material such as porcelain. A conductive wire 370 forming the high-voltage coil 300 is connected to the terminal portion 362, and is connected to the terminal portion 262 of the low-voltage coil bobbin 260 via the terminal portion 362.

Further, outside the high-voltage coil 300, a high-voltage diode, a high-voltage resistor, a high-voltage capacitor, and the like constituting a high-voltage rectifier circuit are mounted. The pair of cores 100 are arranged by inserting one leg 110 of both cores 100 into the low-voltage coil bobbin 260. These cores 100, the low-voltage coil 200, the high-voltage coil 300, and the high-voltage rectifier circuit Are housed in a transformer case 400 having an insulating property, and the inside of the transformer case 400 is filled with an insulating resin.

[0006]

[Problems to be solved by the invention]

 In such a flyback transformer F, a gap is provided between the end faces of the legs 110 of both cores 100, and a predetermined gap is provided between the end faces of the legs 110 in order to reduce the loss due to the leakage magnetic flux. An insulating gap spacer 500 having a thickness is provided.

[0007] Usually, the gap spacer 500 is attached to the end surface of the leg 110 using, for example, an adhesive or the like. Therefore, it is necessary to separately prepare the gap spacer 500 having a predetermined thickness. When assembling the back transformer F, the gap spacer 500 must be bonded to the end face of one leg 110 in advance, and then the end face of the leg 110 left after being inserted into the low-voltage coil bobbin 260 must be bonded. Assembly work was not easy either.

[0008] Japanese Patent Publication No. 8-97062 also discloses a configuration of a flyback transformer, but it is necessary to provide a gap spacer in the core gap in the same manner as described above.

The present invention has been made in view of the above-mentioned drawbacks of the conventional example, and secures a gap between both cores without using a spacer portion, thereby reducing the manufacturing cost of a flyback transformer or the like. It is in.

[0010]

[Means for Solving the Problems]

 The coil bobbin according to the invention of claim 1 is used for a transformer having a core provided with a gap, and has a cylindrical portion around which a coil is wound. A spacer portion is provided on an inner wall and / or an outer wall of the portion, the spacer portion being inserted into a gap of the core.

Further, the transformer case according to the invention of claim 2 of the present application is a transformer case used for a transformer including a core provided with a gap and a coil bobbin having a cylindrical portion around which a coil is wound. And a spacer portion inserted into a gap of the core is provided on an inner wall of a transformer case main body that accommodates the core and the coil bobbin.

The invention according to claim 3 of the present application is a first transformer according to the invention, wherein the transformer includes a pair of cores provided with a gap and a cylindrical portion around which a coil is wound. A coil bobbin having a spacer portion inserted into a gap between the cores on a wall, the pair of cores being inserted into the cylindrical portion from above and below, and the spacer portion being sandwiched by the pair of cores; It is characterized by that.

[0013] The invention according to claim 4 of the present application is a second transformer according to the invention, wherein the transformer has a core provided with a gap and a cylindrical portion around which the coil is wound. A transformer case having a bobbin and a spacer portion inserted into a gap of the core on an inner wall of a transformer case body for storing the core and the coil bobbin, wherein the spacer portion is inserted into the gap. Features.

Further, the invention according to claim 5 of the present application is a third transformer according to the invention, which is a pair of substantially U-shaped transformers arranged to face each other with a gap provided between legs. And a coil bobbin provided on the inner wall of the cylindrical portion around which the coil is wound with a spacer portion inserted into the gap between the leg portions, and one of the leg portions of each core is provided. Is inserted into the cylindrical portion from above and below, and the spacer portion is sandwiched between the inserted leg portions.

Here, in the third transformer, it is preferable that a coil bobbin around which the second coil is wound is provided on an outer periphery of the coil, as described in claim 6.

According to a third aspect of the present invention, in the third transformer, the core is inserted into a gap between the legs on an inner wall of a transformer case main body that houses the core and the coil bobbin. A transformer case provided with a spacer portion may be provided, and the spacer portion may be sandwiched between a pair of remaining leg portions.

Alternatively, as in the transformer according to the eighth aspect, the transformer according to the sixth aspect is further inserted into the gap between the legs on the outer wall of the cylindrical portion of the second coil bobbin. A spacer portion may be provided, and the spacer portion may be sandwiched between a pair of remaining leg portions.

According to a ninth aspect of the present invention, there is provided a fourth transformer according to the present invention, wherein a pair of substantially U-shaped cores are provided facing each other with a gap provided between legs. A coil bobbin having a spacer portion inserted into a gap between the legs is provided on an outer wall of the cylindrical portion around which the coil is wound, and one leg of each core is inserted into the cylindrical portion. And the spacer is sandwiched between the pair of remaining legs.

Here, as in the transformer according to the tenth aspect, a spacer portion inserted into the gap between the legs is provided on the inner wall of the cylindrical portion of the coil bobbin, and is inserted into the cylindrical portion. The spacer portion can be sandwiched between the pair of leg portions.

[0020]

FIG. 1 is a schematic structural view showing a transformer according to an embodiment of the present invention, and FIG. 2 shows a bobbin for a coil according to an embodiment of the present invention used in the transformer. FIG. 3A is a side view, FIG. 3B is a plan view, and FIG. 3 is a sectional view of the coil bobbin. FIG. 4 is a schematic configuration diagram illustrating a transformer according to another embodiment of the present invention, and FIG. 5 is a diagram illustrating a coil bobbin according to another embodiment of the present invention used in the transformer. 6A is a plan view thereof, FIG. 6B is a cross-sectional view thereof, FIG. 6 is a schematic configuration diagram showing a transformer according to still another embodiment of the present invention, and FIG. FIG. 8 is a schematic plan cross-sectional view, FIG. 8 is a schematic configuration diagram showing a transformer according to still another embodiment of the present invention, and FIG. 9 is a schematic configuration diagram showing a transformer according to still another embodiment of the present invention. Hereinafter, the present invention will be described in detail with reference to the drawings.

The transformer shown in FIG. 1 is a transformer A according to an embodiment of the present invention, which is a so-called flyback transformer, and is a board-mounted transformer. The transformer A includes a pair of cores 100 that form a magnetic path, a low-voltage coil 200 and a high-voltage coil 300, a high-voltage rectifier circuit (not shown), and the like.

Each of the pair of cores 100 has a substantially U shape having a pair of legs 110a and 110b, and is made of a magnetic material such as ferrite, for example. In addition, the pair of cores 100 are arranged such that end faces of the respective leg portions 110a and 110b face each other and a certain amount of gap is provided between both end faces.

The low-voltage coil 200 constitutes a primary coil of a flyback transformer, and is formed by winding a conductive wire 270 around a coil bobbin 210. The coil bobbin 210 includes a substantially cylindrical tubular portion 211 and a terminal portion 212 as shown in FIG. 2, and is integrally formed from an insulating material such as resin. The terminal portion 212 is made large enough to support the high voltage coil 300 disposed on the outer periphery, and the conductive wire 270 is wound around the cylindrical portion 211. The terminal portion 212 is formed with two pairs of terminals 213 and 214 each having an end protruding outside the case, and one of the terminals 213 is connected to the conductive wire 270 of the low-voltage coil 200. Are connected, and the high voltage coil 300 is connected to the remaining pair of terminals 214.

The low-voltage coil 200 is arranged by inserting one of the legs 110 a of the pair of cores 100 into the cylindrical portion 211 of the coil bobbin 210. Therefore, the cylindrical portion 211 is made large enough to insert at least the leg portion 110a of the core 100. As shown in FIGS. 2B and 3, a flat plate-shaped spacer portion 220 substantially covering the cylindrical portion 211 is formed integrally with the cylindrical portion 211 on the inner wall of the cylindrical portion 211. In addition, a hole 221 is formed in the center of the spacer 220. The spacer section 220 is for securing a gap between the end faces of the leg sections 110a of the pair of cores 100, and is designed to have a thickness substantially equal to the distance of the gap. In addition, the hole 221 is not essential and may be omitted.

The high voltage coil 300 constitutes the secondary coil of the flyback transformer, and is exactly the same as the high voltage coil 300 used in the flyback transformer F shown in FIG. Omitted.

The transformer A is assembled as follows. First, a gap spacer 500 used in a conventional example is attached to one end of one of the legs 110a and 110b of one of the cores 100, for example, the leg 110b. Next, the low-voltage coil 200 is previously inserted into the cylindrical portion 720 of the high-voltage coil bobbin 360 of the high-voltage coil 300, and both ends are inserted into the cylindrical portion 211 of the coil bobbin 210 of the inserted low-voltage coil 200. The other leg portion 110a of the core 100 is inserted from above and below, and the end surfaces of the leg portion 110a are brought into contact with both surfaces of the spacer portion 220 and bonded together with an adhesive or the like. Further, the other leg portion 110b is also brought into contact with the gap spacer 500 and bonded with an adhesive or the like.

Thereafter, the conductive wire 270 of the low-voltage coil 200 is connected to the pair of terminals 213, and the conductive wire 370 of the high-voltage coil 300 is connected to the terminal 214 of the remaining low-voltage coil 200 via the terminal portion 362 of the high-voltage coil 300. Connecting. A pair of the core 100, the low-voltage coil 200, the high-voltage coil 300, and the high-voltage rectifier circuit (not shown) thus assembled are housed in a transformer case 400 and filled with an insulating resin to obtain a transformer A according to the present invention.

As described above, in the present invention, at least one gap spacer 500 can be omitted, and the number of parts can be reduced. Moreover, similarly to the conventional example, the spacer portion 220 can be easily inserted into the gap simply by inserting the pair of cores 100 into the cylindrical portion 211 of the coil bobbin 210 of the low-voltage coil 200.

Next, the transformer B shown in FIG. 4 is also a flyback transformer. In this transformer B, the spacer 320 provided on the coil bobbin 310 of the high-voltage coil 300 is sandwiched in the remaining gap. This is different from the transformer A shown in FIG.

That is, in the transformer B, the high-voltage coil 300 is provided with the coil bobbin 310 according to the present invention in which the substantially disk-shaped spacer portion 320 is provided on the outer wall of the cylindrical portion 311 as shown in FIG. Used. The coil bobbin 310 is provided with two terminal portions 312 at upper and lower ends of a substantially cylindrical tubular portion made of an insulating material such as porcelain, and a conductive wire 370 is wound around the tubular portion 311. Is done. Further, the cylindrical portion 311 is formed in a size sufficient to allow the low-voltage coil 200 to be inserted. The terminal portion 312 is provided with terminals (not shown), and both ends of the conductive wire 370 are connected to the terminals.

The spacer section 320 has an area of at least approximately the same size as the end face of the leg section 110b of the core 100, and is adapted to the distance between the pair of leg sections 110a and the leg section 110b. A thin plate-shaped arm portion 340 is provided between the outer wall of the cylindrical portion 311 and the spacer portion 320.

As described above, by providing the spacer portion 320 on the outer wall of the tubular portion 311 of the coil bobbin 310 constituting the high-voltage coil 300, the gap spacer 500 to be inserted into the gap of the pair of remaining leg portions 110b is provided. It can be omitted and the number of parts can be reduced.

The transformer C shown in FIGS. 6 and 7 is also a flyback transformer. In the transformer C, a spacer part 20 provided on the inner wall of the transformer case 10 is provided in the remaining gap. It is different from the transformer A shown in FIG. 1 only in that it is sandwiched.

That is, in the transformer C, as shown, a transformer case 600 according to the present invention in which a substantially disk-shaped spacer portion 620 is integrally provided on the inner wall of the transformer case main body 610 is used. ing. The transformer case 600 is made of an insulating material such as plastic, has substantially the same configuration as the transformer case 400 of the related art, and is provided with a spacer 620 on the inner wall of the transformer case body 610. The only difference is. The spacer portion 620 is formed to have substantially the same size as the end surface of the leg portion 110b of the core 100. The spacer portion 620 may be adjusted to the position where the core 100 is to be disposed, and if necessary, the inner wall of the transformer case main body 610 and the spacer portion 620 And a thin plate-shaped arm 630 is provided. As described above, the spacer section 620 may be provided on the inner wall of the transformer case main body 610 that houses the core 100 and the like.

In each of the above embodiments, a case where the present invention is applied to a flyback transformer has been described. However, the present invention is applied not only to a flyback transformer but also to various types of transformers having a core with a gap. Is possible.

A transformer D shown in FIG. 8 is an example of a pulse transformer used in a pulse generating circuit, for example. In the transformer D, a pair of substantially U-shaped cores 100 is provided with leg portions 110a, A pair of legs 110a and 110b are provided with a primary coil 700 and a secondary coil 800, respectively, with a gap provided between them 110b. In each of the primary coil 700 and the secondary coil 800, a conductive wire 770 is wound around the cylindrical portion 711 of the coil bobbin 710 according to the present invention, and a spacer is provided on the inner wall of the cylindrical portion 711. A portion 720 is provided. As described above, the coil bobbin 710 according to the present invention may be used for the primary coil 700 and the secondary coil 800 used for the pulse transformer and the power transformer.

Further, in the transformer E shown in FIG. 9, a coil bobbin 910 provided with spacer portions 920 and 930 on the inner wall and the outer wall of the cylindrical portion 911 is used. As described above, two spacer portions 920 and 930 may be provided on the inner wall and the outer wall of one coil bobbin 910, and the conductive wire 970 is wound around the cylindrical portion 911 of the coil bobbin 910. By doing so, it can be used for the transformer coil 900.

In each of the above embodiments, the core-type transformer has been described, but it goes without saying that the present invention can also be applied to a shell-type transformer.

[0039]

[Effect of the invention]

 The coil bobbin according to the invention of claim 1 is used for a transformer having a core provided with a gap, and has a cylindrical portion around which a coil is wound. Since the spacer portion to be inserted into the gap of the core is provided on the inner wall and / or the outer wall of the portion, it is not necessary to prepare a separate gap spacer, and the number of components constituting the transformer can be reduced.

Further, the transformer case according to the invention of claim 2 of the present application is a transformer case used for a transformer including a core provided with a gap and a coil bobbin having a cylindrical portion around which a coil is wound. In addition, since the spacer portion to be inserted into the gap of the core is provided on the inner wall of the transformer case main body that accommodates the core and the coil bobbin, it is not necessary to prepare a separate gap spacer, and the transformer is not required. The number of constituent parts can be reduced.

By using such a coil bobbin and a transformer case according to the present invention, it can be applied to various transformers, and the production cost of the transformer can be reduced.

For example, in the first transformer according to the present invention described in claim 3 of the present application, the pair of cores provided with a gap and the inner wall of the cylindrical portion around which the coil is wound are provided on the inner wall of the tubular portion. A coil bobbin provided with a spacer portion inserted into a gap of the core, the pair of cores being inserted into the cylindrical portion from above and below, and the spacer portion being sandwiched between the pair of cores; I have.

In the second transformer according to the present invention described in claim 4 of the present application, a core provided with a gap, a coil bobbin having a cylindrical portion around which the coil is wound, and A transformer case having a spacer portion inserted into the gap of the core is provided on an inner wall of a transformer case main body for housing the core and the coil, and the spacer portion is inserted into the gap.

Further, in a third transformer according to the present invention described in claim 5 of the present application, a pair of substantially U-shaped cores disposed opposite each other with a gap provided between the legs. A coil bobbin having a spacer portion inserted into a gap between the leg portions on an inner wall of the cylindrical portion around which the coil is wound, and any one leg portion of each core is attached to the cylindrical portion. The spacer is inserted from above and below, and the spacer is inserted and sandwiched between the legs, and can be applied to a transformer such as a pulse transformer or a power transformer.

Here, the third transformer is provided with a second coil bobbin around which a coil is wound on the outer periphery of the coil, as described in claim 6. , Can be used as a flyback transformer.

In the transformer according to claim 7, in the third transformer according to the present invention, a gap between the legs is provided on an inner wall of a transformer case main body that houses the core and the coil bobbin. Since a transformer case having a spacer portion inserted into the space is provided, and the spacer portion is sandwiched between a pair of remaining leg portions, two gap spacers can be omitted, and the number of components of the transformer can be further reduced. it can.

Alternatively, in the transformer according to the eighth aspect, the transformer according to the sixth aspect is further inserted into an outer wall of a cylindrical portion of the second coil bobbin in a gap between the legs. Since the spacer portion is provided and the spacer portion is sandwiched between the pair of remaining leg portions, two gap spacers can be omitted in this case as well.

In a fourth transformer according to the present invention, a pair of substantially U-shaped cores are provided opposite to each other with a gap between the legs, A coil bobbin having a spacer portion inserted into a gap between the legs is provided on an outer wall of the cylindrical portion around which the coil is wound, and one of the legs of each core is attached to the cylindrical portion. At the same time as inserting, the spacer is sandwiched between the pair of remaining legs, and even with such a configuration, the number of components of the transformer can be reduced.

Here, as in the transformer according to claim 10, a spacer portion inserted into the gap between the leg portions is further provided on the inner wall of the tubular portion of the coil bobbin. If the spacer portion is sandwiched between a pair of leg portions inserted into the coil bobbin, one coil bobbin can serve as two gap spacers, and the number of components can be further reduced.

[Brief description of the drawings]

FIG. 1 is a schematic structural view showing a transformer according to an embodiment of the present invention.

FIGS. 2A and 2B show a coil bobbin according to an embodiment of the present invention used in the transformer, wherein FIG. 2A is a side view thereof and FIG. 2B is a plan view thereof. is there.

FIG. 3 is a cross-sectional view of the above-described coil bobbin.

FIG. 4 is a schematic configuration diagram showing a transformer according to another embodiment of the present invention.

FIG. 5 illustrates a coil bobbin according to another embodiment of the present invention used in the transformer according to the present invention;
FIG. 1A is a plan view thereof, and FIG. 1B is a sectional view thereof.

FIG. 6 is a schematic configuration diagram showing a transformer according to still another embodiment of the present invention.

FIG. 7 is a schematic plan sectional view of the transformer according to the third embodiment;

FIG. 8 is a schematic configuration diagram showing a transformer according to still another embodiment of the present invention.

FIG. 9 is a schematic configuration diagram showing a transformer according to still another embodiment of the present invention.

FIG. 10 is a schematic configuration diagram showing a transformer according to a conventional example.

[Explanation of symbols]

 A, B, C, D, E Transformers according to the present invention 100 cores 110a, 110b One set of legs 200 low-voltage coil 210 coil bobbin 211 according to the present invention tubular part 220 spacer part 270 conductive wire 300 high-voltage coil 310 Invented coil bobbin 311 Cylindrical part 320 Spacer part 330 Arm part 370 Conductive wire 400 Conventional transformer case 500 Gap spacer 600 Transformer case 610 Trans case body 620 Spacer part 630 Arm part 700 Primary coil 710 Coil bobbin according to the present invention 720 Spacer section 800 Secondary coil

Claims (10)

[Utility model registration claims] 1. A bobbin for a coil, which is used for a transformer having a core provided with a gap and has a tubular portion around which a coil is wound, wherein the inner wall and / or the outer wall of the tubular portion have A bobbin for a coil, comprising a spacer portion inserted into a gap of a core. 2. A transformer case for use in a transformer having a core provided with a gap and a coil bobbin having a cylindrical portion around which a coil is wound, wherein the transformer houses the core and the coil bobbin. A transformer case, wherein a spacer portion inserted into a gap of the core is provided on an inner wall of a case body. 3. A coil bobbin comprising: a pair of cores provided with a gap, and a spacer portion inserted into a gap of the core on an inner wall of a cylindrical portion around which the coil is wound; Inserting a pair of cores into the tubular part from above and below,
A transformer, wherein the spacer portion is sandwiched between the pair of cores. 4. A core provided with a gap, a coil bobbin having a cylindrical portion around which a coil is wound, and a gap between the core and an inner wall of a transformer case main body accommodating the core and the coil bobbin. A transformer, comprising: a transformer case provided with a spacer portion to be inserted, wherein the spacer portion is inserted into the gap. 5. A pair of substantially U-shaped cores disposed facing each other with a gap provided between the legs, and an inner wall of a cylindrical portion around which the coil is wound, and a gap formed between the legs. A coil bobbin having a spacer portion to be inserted was provided, and one leg portion of each core was inserted into the cylindrical portion from above and below, and the spacer portion was sandwiched between the inserted leg portions. A transformer characterized by that: 6. The transformer according to claim 5, further comprising a coil bobbin having a cylindrical portion around which the second coil is wound, on an outer periphery of the coil bobbin. 7. A pair of transformer cases each having a spacer portion provided on an inner wall of a transformer case main body accommodating the core and the coil bobbin, the spacer portion being inserted into a gap between the leg portions. 7. The transformer according to claim 5, wherein the transformer is sandwiched between the legs. 8. A spacer portion inserted into a gap between the leg portions is provided on an outer wall of the cylindrical portion of the second coil bobbin, and the spacer portion is sandwiched between a pair of remaining leg portions. The transformer according to claim 6, wherein 9. A pair of substantially U-shaped cores disposed opposite each other with a gap provided between the legs, and an outer wall of a cylindrical portion around which the coil is wound is formed on a gap between the legs. A coil bobbin having a spacer portion to be inserted, wherein one of the leg portions of each core is inserted into the cylindrical portion, and the spacer is sandwiched between a pair of remaining leg portions. Transformers. 10. A spacer which is inserted into a gap between the legs on an inner wall of a cylindrical portion of the coil bobbin,
10. The transformer according to claim 9, wherein the spacer portion is sandwiched between a pair of leg portions inserted into the cylindrical portion.