JP2003133146A - Transformer-bobbin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To securely prevent contact between the lead of a winding wire located internally and a winding wire located externally without any tube or protective tape required. SOLUTION: In a transformer-bobbin 1 having a winding of a plurality of layers, a stepped section 5 is provided on the side of a base 2 of a bobbin center 4 in accordance with the thickness of the plurality of windings, and a slit 7 is provided, which reaches the inside of the stepped section and which guides the lead 8a of a primary winding wire 8 located internally to a pin 3 at the lower part of the base.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transbobbin having a plurality of layers of windings.

[0002]

2. Description of the Related Art A conventional bobbin structure is shown in FIGS.

In FIGS. 6 and 7, the trans bobbin 101 is shown.
Is the base 102, the bobbin center 104 and the top 10.
5 are integrally formed, and the pin 103 is formed on the bottom of the base 102.
Is provided. A primary winding (P) 106, an interlayer tape 107, and a secondary winding (S) 108 are sequentially wound on the bobbin center 104 from the inside. Lead-out portion 106a of the primary winding 106 and lead-out portion 108 of the secondary winding 108
Each a is connected to the corresponding pin 103.

In the conventional example shown in FIG. 6, when the primary winding 106 is pulled out, the lead-out portion 106a intersects with the secondary winding 108, so that the lead-out portion 106a of the primary winding 106 is covered with a tube 109. The contact with the secondary winding 108 is prevented.

The conventional example shown in FIG. 7 has a bobbin structure having a groove 110 for guiding the lead-out portion 106a of the primary winding 106 to the pin 103. However, since the base surface on the winding side is flat, the interlayer tape 107 is used. Even if it is wound, the lead-out portion 106a of the primary winding 106 may intersect with the secondary winding 108. Therefore, by attaching the protective tape 111,
Contact between the lead-out portion 106a of the secondary winding 106 and the secondary winding 108 is prevented.

[0006]

However, in such a conventional transformer bobbin structure, in the conventional example of FIG. 6, the contact between the lead-out portion of the primary winding and the secondary winding is made. In order to prevent this, it is necessary to cover the lead-out portion of the primary winding with a tube, which increases the number of assembly and manufacturing steps, leading to an increase in cost.

Further, even in the conventional example of FIG. 7 having a groove for guiding the winding lead-out portion to the pin, there is a possibility of contact between the lead-out portion of the primary winding and the secondary winding, It is necessary to apply a protective tape, which increases the man-hours for assembly and manufacturing, which leads to an increase in cost.

It is an object of the present invention to provide a transbobbin that reliably prevents contact between a lead-out portion of a winding located inside and a winding outside without requiring a tube or a protective tape.

[0009]

To achieve this object, the present invention is constructed as follows.

According to the present invention, in a transformer bobbin having a plurality of layers of windings, a step is provided on the base side of the bobbin center according to the thickness of the plurality of windings, and the winding is provided from the outer circumference of the base to the inside of the step. It is characterized in that a groove is provided for guiding the lead-out portion to the pin below the base.

Therefore, the position of the plurality of windings with respect to the bobbin center is determined by the step formed on the base surface on the winding side, and the groove for guiding the inner winding drawing portion to the pin is formed up to the inside of the step. Therefore, the lead-out portion of the inner winding can be guided to the pin without crossing the outer winding whose position is regulated by the step portion, and a tube or a protective tape is not required to prevent contact.

According to another aspect of the present invention, in a transformer bobbin having a plurality of layers of windings, the base of the lead-out portion of each winding is formed according to the thickness of the plurality of windings wound around the bobbin center. The groove and the pin are alternately arranged around the bobbin center in the winding order.

For this reason, since the pin is arranged near the position of the winding wire and the corresponding pin is provided with the groove for guiding the winding lead-out portion, the lead-out portion is not crossed with the winding located outside. Can be guided to a pin and does not require a tube or protective tape to prevent contact.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view showing an embodiment of a transbobbin of the present invention. 1, a trans bobbin 1 of the present invention has a base 2, a bobbin center 4 and a top 6 which are integrally formed by resin molding or the like, and a pin 3 for connecting to a printed circuit board is provided below the base 2. There is. In addition, 4a is a core insertion hole.

A step portion 5 is formed on the upper surface of the base 2 which is the base of the bobbin center 4. In this embodiment, the step portion 5 has two windings, that is, a primary winding and a secondary winding. Therefore, the step portion 5 has a step outer surface 5b that is lowered by one step with respect to the step inner surface 5a.

Further, two grooves 7 extending from the periphery of the base 2 to the step inner surface 5a are formed in the step portion 5. The groove 7 is provided to guide the corresponding pin 3 through the lead-out portion of the primary winding located inside of the primary winding and the secondary winding that are wound around the bobbin center 4 in order.

FIG. 2 is a side view of the transbobbin shown in FIG. 1, in which the groove 7 is cut away and shown in a partial cross section. The groove 7 is provided from the outer periphery of the base 2 to the vicinity of the root of the bobbin center 4 on the step inner surface 5a, and is opened to the lower portion of the base 2 corresponding to the pin 3 by the obliquely inclined groove surface.

FIG. 3 is an explanatory view of a transformer using the transbobbin of the present invention shown in FIGS. 1 and 2, and the core is omitted.

In the bobbin center 4 of the trans bobbin 1,
The primary winding 8 is wound, and the primary winding 8 is located on the step inner surface 5 a of the step 5. The lead-out portion 8a of the primary winding 8 is led out to the lower portion of the base 2 through the groove 7 and is connected to the corresponding pin 3 by winding or the like.

An interlayer tape 9 is wound around the outside of the primary winding 8. The lower side of the interlayer tape 9 is the step outer surface 5b of the step 5.
So that the outer opening portion of the groove 7 in the step portion 5 is covered with the tape. Subsequently, the secondary winding 10 is wound, and the lead-out portion 10a is turned downward from the outside of the base 2 and connected to the corresponding pin 3.

In the transformer structure using the trans bobbin 1 of the present invention as described above, the lead-out portion 8a of the primary winding 8 located on the inner side passes through the groove 7 extending to the inner side of the step portion 5 and becomes the base. The position of the secondary winding 10 positioned outside is guided by the pin 3 at the bottom of the secondary winding 2, and the position of the secondary winding 10 is regulated by the stepped portion 5. Further, the interposition of the interlayer tape 9 causes the lead-out portion of the primary winding 8 to pass through the groove 7. 8a is insulated and separated, and contact with the secondary winding 10 is reliably prevented.

FIG. 4 shows another embodiment of the present invention. In this embodiment, the case where windings are provided in three layers is taken as an example.

In FIG. 4, a trans bobbin 1 has a base 2, a bobbin center 4 and a top 606 integrally formed by resin molding or the like, and a pin 3 for connecting to a printed circuit board is provided below the base 2. There is.

A step portion 5 is formed on the upper surface of the base 2 which is the base of the bobbin center 4. In this embodiment, the step portion 5 has three windings, that is, the primary winding 8, the secondary winding 10, and the auxiliary winding 13. Therefore, the step portion inner surface 5a and the step portion central surface are sequentially lowered. 5c and a step outer surface 5b.

For the step portion 5, a groove 12a extending from the periphery of the base 2 to the step inner surface 5a and a groove 12c extending to the step central surface 5c are formed. The grooves 12a and 12c are formed by the primary winding 8 and the secondary winding 1 which are wound around the bobbin center 4 in order.
It is provided to connect to the corresponding pin 3 through the lead-out portions 8a and 10a of 0. The lead-out portion 13 a of the auxiliary winding 13 is turned from the outside of the base 2 to the lower portion and connected to the corresponding pin 3.

Even in the transformer structure using the transformer bobbin 1 for three windings according to the present invention, the lead-out portion 8a of the primary winding 8 and the lead-out portion 10a of the secondary winding 10 located inside are arranged. Is a groove 12 extending to the inside of each of the step portions 5.
The positions of the windings located outside are guided by the pins 3 at the bottom of the base 2 through a and 12c, and the positions of the windings located outside are regulated by the steps of the stepped portion 5. Draw-out part 8 of the primary winding 8 passing through
a and the lead-out portion 10a of the secondary winding 10 are insulated and separated from each other, and contact with the winding located outside is reliably prevented.

FIG. 5 shows another embodiment of the present invention. In this embodiment, the groove and pin of the lead-out portion of each winding are centered on the bobbin center according to the thickness of the plurality of windings. It is characterized in that the windings are provided alternately in the winding order.

In FIG. 5 (A), a trans bobbin 1 of the present invention has a base 2, a bobbin center 4 and a top 6 which are integrally formed by resin molding or the like, and a lower part of the base 2 for connecting to a printed circuit board. Pin 3 is provided. The upper surface of the base 2, which is the base of the bobbin center 4, is flat.

In the bobbin center 4, the primary winding 8 and the
Interlayer tape 9 between the secondary winding 10 and the auxiliary winding 13
It is wound with a and 9b interposed. Draw-out portions 8a, 10 of the primary winding 8, the secondary winding 10 and the auxiliary winding 13
a and 13a are grooves 14a and 14 formed in the base 2.
It is connected to the corresponding pin 3 through b and 14c.

The base 2 has lead portions 8a, 10a, 13a according to the thicknesses of the primary winding 8, the secondary winding 10 and the auxiliary winding 13, as shown in the plan sectional view of FIG. 5B. The pins 3 corresponding to the grooves 14a, 14b, 14c through which the holes pass are provided alternately in the winding order around the bobbin center 4.

That is, the pin 3 corresponding to the two grooves 14a is provided on the left side corresponding to the primary winding 8, and the pin 3 corresponding to the two grooves 14b on the right side corresponding to the secondary winding 10. 3 is provided, and two grooves 14 are provided on the left side corresponding to the auxiliary winding 13.
A pin 3 corresponding to c is provided.

Therefore, even if a step is not provided on the upper surface of the base, a groove is formed at the position of the lead-out portion of each winding, and it can be connected to the pin without crossing the outer winding, Contact is reliably prevented.

In the above embodiment, the trans bobbin corresponding to the winding of two layers or three layers is taken as an example, but the present invention is not limited to this, and any number of layers may be used.

[0034]

As described above, according to the present invention, the positions of the plurality of windings with respect to the bobbin center are determined by the step formed on the winding-side base surface, and the inner winding drawing portion is guided to the pin. Since the groove is formed to the inside of the step, the lead-out part of the inner winding can be guided to the pin without crossing the outer winding whose position is regulated by the step.
No need for tubes or protective tape to prevent contact,
The number of manufacturing steps can be reduced and the cost can be reduced.

Further, the grooves and pins of the lead-out portions of the respective windings are provided in the base in an alternating manner in the winding order around the bobbin center according to the thickness of the plurality of windings wound around the bobbin center. Since the pin is arranged on the pin and the groove for guiding the winding lead-out portion is provided in the corresponding pin, the lead-out portion can be guided to the pin without crossing the winding located outside, and for preventing contact No tube or protective tape is required, and similarly, the number of manufacturing steps can be reduced and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is an explanatory view of an embodiment of a trans bobbin according to the present invention.

FIG. 2 is a side view of the trans bobbin shown in FIG.

FIG. 3 is an explanatory diagram of a transformer structure using the trans bobbin of FIGS.

FIG. 4 is an explanatory diagram of a transformer structure using a transbobbin of the present invention corresponding to windings of three layers.

FIG. 5 is an explanatory view of a transformer structure using a trans bobbin according to another embodiment of the present invention having no step portion.

FIG. 6 is an explanatory diagram of a transformer structure using a conventional trans bobbin.

FIG. 7 is an explanatory view of a transformer structure using a conventional transformer bobbin having a groove for drawing out a winding wire.

[Explanation of symbols]

1: Trans bobbin 2: Base 3: Pin 4: Bobbin center 5: Step 5a: inner surface of step 5b: Step outer surface 6: Top 7, 12a, 12c: groove 8: primary winding 8a, 10a, 13a: drawer part 9, 9a, 9b: Interlayer tape 10: Secondary winding 13: Auxiliary winding

Claims (2)

[Claims] 1. A transformer bobbin having a plurality of layers of windings, wherein steps are provided on the base side of a bobbin center according to the thickness of the plurality of windings, and windings are drawn from the outer circumference of the base to the inside of the steps. A trans bobbin having a groove for guiding the portion to a pin below the base. 2. A transformer bobbin having a plurality of layers of windings, the groove and pin of the lead-out portion of each winding being centered on the bobbin center according to the thickness of the plurality of windings wound around the bobbin center. A trans bobbin characterized by being provided in a staggered order in the winding order.