JP2532235Y2 - Trance - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION INDUSTRIAL APPLICATION FIELD The present invention relates to a transformer used for various audio equipment, video equipment, industrial equipment, and the like.

2. Description of the Related Art The development of electronic technology in recent years has been remarkable. In particular, in electronic devices to which transformers are applied, for example, multifunctional telephones, video tape recorders, color television receivers, etc., electronic components including transformers are mounted at high density in order to reduce the size and weight of the electronic devices, and the transformer itself is also used. As miniaturization is realized, there is a demand for a transformer that is small, has high performance, and has excellent noise characteristics.

The conventional transformer was configured as shown in FIG. That is, in FIG. 5, an upper end flange 2 and a lower end flange 3 are provided on the upper and lower ends of the bobbin 1, an enlarged portion is formed on the lower end flange 3, and a plurality of pin terminals 4 are planted.

A primary winding 5 is wound around the bobbin 1, and a primary insulating tape 11 is wound around a copper foil shield 8 described later and the primary winding 5 for the purpose of insulation.

In many cases, the copper foil shield 8 is usually formed of a copper foil having a thickness of several tens to several hundreds of microns. As shown in FIG. 6, a lead lead 13 for lead wiring for the lead terminal 4 of the transformer is soldered. Have been.

Reference numeral 14 in FIG. 6 indicates a soldered portion of the lead 13. Thereafter, a secondary insulating tape 12 is wound around the copper foil shield 8 and the secondary winding 6 for the purpose of insulation. After the secondary winding 6 is wound, the magnetic material 10 is inserted into the bobbin 1 and the transformer is inserted. Make up.

Problems to be Solved by the Invention In the conventional transformer, as described above, the insulation between the copper foil shield 8 and the primary winding 5 and the secondary winding 6 is required, and as shown in FIG. Like drawer lead
13 and the soldering portion 14 of the copper foil shield 8 and the secondary winding 6 need to be insulated from each other.
Meanwhile, it was necessary to wind insulating tapes 11 and 12 between the copper foil shield 8 and the secondary winding 6, respectively. Therefore, displacement of the insulating tapes 11 and 12 or the edge of the copper foil shield 8 scratches the insulating film of the copper wire, causing insulation failure. In addition, since the tape is wound several times, the workability is poor.

Accordingly, the present invention provides a third winding in which two to four layers of a wire having an insulating film are wound between the primary winding and the secondary winding, and a lead at the beginning of winding of the third winding. In addition, the winding end lead is wired and soldered to an arbitrary terminal to form a shield winding.

Means for Solving the Problems The means of the present invention for solving the above problems is to provide a primary winding and a secondary winding so as to be laminated, and to wire the primary winding and the secondary winding. A third winding in which a wire having an insulating coating is wound between a plurality of layers is provided, and a magnetic core is incorporated in the third winding, and a winding start lead and a winding end lead of the third winding are connected to arbitrary terminals. The shield winding is formed by wiring and soldering, and the diameter of the third winding is made smaller than the diameter of the primary winding and the diameter of the secondary winding. This is a configuration in which an interlayer tape is provided between the coil and the winding.

Operation The operation of this means is as follows.

A third winding is provided between the primary winding and the secondary winding, and a winding start lead and a winding end lead of the third winding are wired to arbitrary terminals, soldered, and shielded. Since the wire is configured, this shield winding has the same function as a copper foil tape.

In other words, since the winding start or end lead of the shield winding is grounded via the soldered pin terminal,
The wire wound inside the shield winding is not affected by the change in the electrolytic strength outside the transformer, and conversely, the electric field change caused by the wire wound inside the shield winding is sent outside the transformer. Does not work.

In addition, since the diameter of the third winding is smaller than the diameter of the primary winding and the diameter of the secondary winding, when each winding is wound, the distance between adjacent primary windings and the distance between adjacent primary windings are reduced. The adjacent third windings are closer to each other than the close state between the secondary windings, and the gap between the adjacent third windings is smaller than that between the primary winding and the secondary winding. Does not occur, and the shielding effect of the third winding can be greatly enhanced.

Further, since the diameter of the third winding is smaller than the diameter of the primary winding, an interlayer tape is provided between the third winding and the primary winding so that the third winding is formed by the primary winding. The third winding is prevented from entering the space between the wires and causing unevenness in the winding of the third winding, thereby reducing the shielding effect.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

In FIG. 1, an upper end flange 22 and a lower end flange 23 are provided at the upper and lower ends of the bobbin 21, and an enlarged portion is formed on the lower end flange 23, and a plurality of pin terminals 24 are planted.

A primary winding 25 is wound around the bobbin 21 and a shield winding 28
, The secondary winding 26 is wound, and the magnetic material 30 is incorporated to constitute a transformer.

In many cases, the shield winding 28 is configured by winding two to four layers of an insulating film copper wire having a wire diameter of about 0.07φ to 0.20φ on the bobbin 21, and a winding start lead and a winding end lead are respectively provided. Wiring and soldering are performed on an arbitrary pin terminal 24.
By winding two to four layers of this insulation-coated copper wire, the insulation-coated copper wire wound in the upper layer enters the gap between the lower insulation-coated copper wire and completely fills the gap to obtain a complete shielding effect. Can be.

If the equipment using the transformer is a positive ground equipment, it is better to ground the beginning of the shield winding 28 of the transformer, and conversely, if the equipment using the transformer is a negative earth equipment, It is known that the shield effect is higher when the end of the shield winding 28 is grounded. However, finally, the user of the device using the transformer may check and determine the shielding effect. The shielding effect is exhibited by dropping either the beginning or the end of the winding to the ground, but the set user has the freedom to freely select the selection.

With reference to FIG. 2, a transformer having three or more windings will be described. Primary winding 25, Secondary winding 26, Tertiary winding 27
In this case, it is necessary to wind shield windings 28 and 28 'between the respective windings as shown in FIG.

In this case, the start of the shield winding 28 and the shield winding 2
At the beginning of winding 8 ', wire and solder to the same pin terminal.
Similarly, at the end of winding, wiring and soldering are performed on the same pin terminals. Below, shield winding 28, 28 '
Is similar to that of FIG.

Further, the shield windings 28, 28 'are relatively thin wires of 0.07φ to 0.20φ, and have a smaller diameter than the primary and secondary windings 25, 26 as shown in FIG. When there are a plurality of wires 25, 26 or a plurality of windings, a uniform winding is provided between the respective wire loops, thereby exhibiting a shielding effect equivalent to that of a copper foil tape.

At this time, as shown in FIG. 3 and FIG. 4, before winding the shield windings 28, 28 'between the respective wire loops, in order to eliminate unevenness due to uneven winding of the lower winding, a thickness of 25 μm is used. The interlayer tape 29 of about 50 μm is wound 2 to 4 times.

By winding the interlayer tape 29 in this way, unevenness is eliminated, and the shield windings 28 and 28 'wound thereon are more uniformly wound, thereby exhibiting a better shielding effect. The interlayer tape 29 is also effective for guaranteeing the withstand voltage between the windings.

Effects of the Invention As described above, the present invention provides a third winding in which two to four layers of a wire having an insulating film are wound between the primary winding and the secondary winding. The winding start lead and winding end lead are wired to any pin terminals and soldered to form a shield winding. Since each winding has an insulating film, the insulating property can be ensured, and a special insulating process is not required, so that a transformer having excellent safety and reliability can be configured. Furthermore, since the shield winding is configured by winding two to four layers of a wire having an insulating film,
The configuration is such that the gap between the windings is completely filled, and the shield effect can be excellent.

In addition, since the diameter of the third winding is smaller than the diameter of the primary winding and the diameter of the secondary winding, when each winding is wound, the distance between adjacent primary windings and the distance between adjacent primary windings are reduced. The adjacent third windings are closer to each other than the close state between the secondary windings, and the gap between the adjacent third windings is smaller than that between the primary winding and the secondary winding. Does not occur, and the shielding effect of the third winding can be greatly enhanced.

Further, since the diameter of the third winding is smaller than the diameter of the primary winding, an interlayer tape is provided between the third winding and the primary winding so that the third winding is formed by the primary winding. The third winding is prevented from entering the space between the wires and causing unevenness in the winding of the third winding, thereby reducing the shielding effect.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a winding part of a two-wire transformer showing a former example of the transformer of the present invention, and FIG. 2 is another former example of the present invention showing a winding part of a three-wire transformer. FIGS. 3 and 4 are cross-sectional views of a winding portion of a transformer in which an interlayer tape is wound between each wire of the transformer of FIGS. 1 and 2, and FIG. 5 is a conventional winding of a transformer. FIG. 6 is a perspective view of the copper foil tape and the solder part. 21 ... bobbin, 22 ... upper end flange, 23 ... lower end flange, 24 ... pin terminal, 25 ... primary winding, 26 ... secondary winding, 27 ... tertiary winding, 28 ... Shield winding, 29 ... interlayer tape, 30 ...
Magnetic material.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Kazunari Ishikawa 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. -74617 (JP, U) Jikken 46-15687 (JP, Y2)

Claims (1)

(57) [Scope of request for utility model registration] A primary winding and a secondary winding are provided so as to be laminated, and a plurality of layers of a wire having an insulating coating between the primary and secondary windings are wound. Three windings,
A magnetic core is incorporated therein, and a winding start lead and a winding end lead of the third winding are wired to arbitrary terminals and soldered to form a shield winding, and the diameter of the third winding is reduced. A transformer having a diameter smaller than a diameter of a primary winding and a diameter of a secondary winding, and an interlayer tape provided between the third winding and the primary winding.