JPH0528013U - Trance - Google Patents

Abstract

(57) [Summary] [Object] With regard to a transformer used for a switching power supply or the like, it is an object of the present invention to provide a highly reliable transformer having an insulating resin having a high penetration with a simple structure. A coil bobbin 11 is provided with embossments 13 projecting at regular intervals at both ends, and an insulating film 15 provided with linear embosses 14 between the embosses 13 at both ends is wound as an interlayer insulating sheet to form a winding. It is housed together with the insulating resin 18 and the magnetic core 19 is incorporated to obtain a highly reliable transformer.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a transformer used for a switching power supply or the like.

[0002]

[Prior Art]

 In recent years, an increasing number of transformers have been injected with an insulating resin in order to reduce the heat dissipation effect and insulation distance. In a conventional transformer, as shown in FIGS. 4 and 5, a coil 2 having a collar at both ends is wound with a winding 2 through an interlayer insulating sheet 3 and a film 4 formed into a plate sheet is wound around the exterior. It was constructed by housing it in a case 5, filling it with an insulating resin 6, and incorporating a magnetic core 7 therein.

[0003]

[Problems to be solved by the device]

 However, in the case of the film 4 formed in the above-mentioned conventional plate sheet, the flowability of the insulating resin 6 is poor and it is difficult for the insulating resin 6 to flow between the loops of the winding wire 2 and voids 8 are easily formed, and the vacuum injection is incomplete. Spacing tape 9 was used to secure the insulation distance between both ends.

For this reason, there are drawbacks that the insulation is not sufficient, dielectric breakdown easily occurs, and the cost becomes disadvantageous.

The present invention solves such a conventional problem, and provides a transformer which has a simple structure to enhance the permeation of the insulating resin and to easily secure the insulation distance between both ends of each winding. It is intended to be provided.

[0006]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention winds a plurality of windings around a coil bobbin having a collar at both ends, and provides embossing at both ends in the winding width direction between each layer of each winding and between the embossing at both ends. The coil bobbin with this winding is housed together with an insulating resin in a case with an insulating film provided with a linear embossing on the inside, and the magnetic core is incorporated in this case.

[0007]

[Action]

 With the above structure, the penetration of the insulating resin can be enhanced by the embossing on both ends, and the embossing provided between the embossing on both ends can ensure the insulation distance between both ends of each ring without using a spacing tape.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS.

A winding 12 is wound around a coil bobbin 11 having flanges 10 at both ends, and an embossment 13 is regularly projected at regular intervals at both ends in the winding width direction of the winding as insulation and an exterior between layers of each winding 12. The insulating film 15 in which linear embosses 14 are provided at regular intervals between the embosses 13 at both ends of the insulating film 15 is wound, and the winding 12 is inside the embosses 10 at both ends. The lead wire of the winding wire 12 is wound around and connected to one end of a plate-shaped metal terminal 16 which is located in the collar 10 of the coil bobbin 11 and is then soldered. The terminals 16 are formed and assembled in the case 17, and the insulating resin 18 is injected into the case 17 and hardened, and the magnetic core 19 made of ferrite such as EE is assembled from the outside of the case 17, and the contact is made. It is fixed with adhesive and forms a transformer.

With the above-described structure, the insulating film 15 inserted between the layers of the winding wire 12 maintains the winding width of each winding layer by the embosses 13 at both ends as shown in FIG. The position is regulated and the insulation distance can be secured. When the winding 12 is wound, the linear embossing 14 is deformed at the winding position of the winding 12 to maintain the winding position and when the insulating resin 18 is injected, What has flowed in between the embosses 13 is injected along the linear embossing 14 into the winding portion for sufficient penetration, and voids are not generated. In this respect also, the insulation is improved. Will be achieved.

[0011]

[Effect of the device]

 As is clear from the above examples, embossing protruding at regular intervals is provided at both ends as an insulating film inserted for insulation between winding layers, and linear embossing is provided between the embossing at both ends. Since the wire is provided, the ends of the winding are positioned by embossing on both ends to secure the insulation distance, and the embossing on both ends facilitates the penetration of the insulating resin. The wire has a good practical value because it penetrates sufficiently between the windings, voids are not generated, and the insulation of the windings is improved, making it highly reliable.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of essential parts showing an embodiment of a transformer of the present invention.

FIG. 2 is a sectional view of the transformer.

FIG. 3 is an enlarged cross-sectional view of the main part.

FIG. 4 is a sectional view of a conventional transformer.

FIG. 5 is an enlarged cross-sectional view of the relevant part.

[Explanation of symbols]

 10 Tsuba 11 Coil bobbin 12 Winding 13 Embossing 14 on both ends 14 Wire-like embossing 15 Insulating film 16 Metal terminal 17 Case 18 Insulating resin 19 Magnetic core

Claims (1)

[Scope of utility model registration request] 1. A plurality of windings are wound around a coil bobbin having a collar at both ends, and embossments projecting at regular intervals are provided at both ends in the winding width direction between respective layers of each winding, and between the embosses at both ends. A transformer having a coil bobbin wound with this winding and an insulating resin interposed in a case with an insulating film provided with a linear embossing interposed, and a magnetic core incorporated in the case.