JPH0722263A - Flyback transformer - Google Patents

Abstract

PURPOSE:To provide a highly reliable flyback transformer being employed in a television receiver, for example, in which the impregnation of molding resin into a high voltage secondary coil split into a plurality of layers is improved. CONSTITUTION:A plurality of cuts 6 are made in an insulating film 5, employed in each layer of a high voltage secondary coil being wound while split into a plurality of layers, from the side edge part to the central part thereof at the start-of-winding part coming into contact with the coil in order to accelerate impregnation when the transformer is molded of rein. Since the molding resin impregnates the gap between the copper wires of high voltage secondary coil efficiently, dielectric strength between the copper wires is enhanced thus enhancing the reliability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flyback transformer used in a television receiver or the like.

[0002]

2. Description of the Related Art In recent years, flyback transformers have been required to have improved reliability as high-voltage output voltages have become higher. Hereinafter, the configuration of the conventional flyback transformer will be described with reference to FIGS.

FIG. 5 is an internal wiring diagram of a conventional flyback transformer. Here, 1 is a primary coil, and 2a to 2f are secondary high voltage coils, which are divided into a plurality of layers and wound in a laminated shape. Rectifiers 3a to 3f are high-voltage coils 2a to 3f.
The pulsed voltage generated by 2f is rectified. Further, 4 is a ferrite core, which constitutes a magnetic path of a magnetic flux generated by the primary coil 1.

FIG. 6 is an enlarged plan view showing the state of the insulating film wound around the secondary high voltage coil. 11 is an insulating film, 12 is a convex portion along the both side edges of the winding start portion of the insulating film 11 as appropriate. It is provided at intervals. A copper wire 13 constitutes the secondary high voltage coils 2a to 2f. Reference numeral 14 represents a high voltage coil bobbin. 7 and 8 show insulating film 11
Is shown in a plan view and a side view, and is used for insulation between the layers of the high voltage coils 2a to 2f which are divided and wound into a plurality of layers of the flyback transformer. The convex portion 12 is provided on the copper wire 13 of the high-voltage coil in order to improve the impregnation property of the casting resin of the transformer.

FIG. 9 is a sectional view showing a state of a high voltage coil and an insulating film which are divided into a plurality of layers and wound, and FIG. 10 is an enlarged sectional view of the main part. Reference numeral 15 shows the impregnated state of the casting resin.

[0006]

However, in the above-mentioned conventional structure, in the secondary high voltage coils 2a to 2f which are divided into a plurality of layers and wound, the tension of the copper wire wound on the next layer is applied, respectively, and The winding tension of the insulating film 11 itself is applied. Therefore, since the former insulating film 11 has a void in the vicinity where the convex portion 12 is provided, the casting resin 15 is easy to be injected, but it is adhered at the center of the high-voltage coil, so There was a drawback that the resin did not enter, and it was difficult for the entire secondary high-voltage coil to be impregnated with the casting resin.

The object of the present invention is to eliminate the above-mentioned conventional drawbacks,
It aims to provide a flyback transformer with improved reliability by improving the impregnation of the casting resin into the high-voltage coil and improving the insulation resistance between the copper wires that make up the secondary high-voltage coil. is there.

[0008]

In order to achieve the above object, the first invention of the present invention is to provide a secondary high voltage of each layer as an insulating film used between the layers of a secondary high voltage coil which is divided into a plurality of layers and wound. A flyback transformer was provided in which a plurality of cutout portions, which were directed toward the center from the side end portions, were provided at the winding start portion in contact with the coil.

According to a second aspect of the invention, a plurality of cutouts are provided in a zigzag manner from both side ends on the winding start side of the insulating film toward the center, and the portions provided with these cutouts are brought into contact with the secondary high voltage coil. It was a wound flyback transformer.

[0010]

In the first aspect of the invention, since the plurality of cutouts are provided from the side end of the insulating film toward the center, the gap of the portion corresponding to the cutouts is provided between the high voltage coils divided into a plurality of layers and wound. Are formed. Therefore, the casting resin is injected along the cutout portion, and the insulating action between the plurality of layers can be improved.

Further, in the second aspect of the invention, since the notches are provided in a zigzag pattern from both side ends of the insulating film toward the center, a gap is formed between the notches and the copper wire when the insulating film is wound. The insulating film that is wound together also has a gap that allows resin injection with the cutouts intersecting so that a reliable insulating action can be obtained between the copper wire between each layer and the insulating film during casting. became.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a plan view showing a winding start of an insulating film 5 of a flyback transformer shown as an embodiment of the present invention. In FIG. 1, reference numeral 5 denotes an insulating film, which is a secondary high voltage coil 2 divided into a plurality of layers and wound.
It is used to insulate the layers a to 2f. 6
Indicates a notch. 7 is a copper wire, and the secondary high-voltage coils 2a to 2
Configure f. Reference numeral 8 represents a high voltage coil bobbin.

FIG. 2 is a plan view of the insulating film 5 taken out, and FIG. 3 is a side view of the same. In the drawing, a plurality of notches 6 are provided in a zigzag manner from both side ends of the insulating film 5 toward the center. In this case, the casting resin was easily injected along the notch 6, the resin was spread over the entire high voltage coil, and the insulation between the layers was ensured. The notch 6 has a zigzag shape so as to enable insulation between the layers of the secondary high voltage coil, and may have a notch extending from one end to the center.

FIG. 4 is an enlarged cross-sectional view of a secondary high voltage coil using the insulating film 5 of the present invention, showing a penetration route of the casting resins 10a and 10b of the transformer.

[0015]

As described above, according to the present invention, the insulating film used for insulating each layer of the secondary high-voltage coil divided into a plurality of layers is provided with a cutout portion at the winding start portion thereof to form an insulating film. It is possible to eliminate the part where the copper wire and the copper wire adhere to each other. In addition, the cutout portion serves as an infiltration route of the casting resin of the transformer, the impregnation property is improved, the insulation resistance between the copper wires is improved, and the excellent flyback transformer in which the reliability of the transformer itself is improved can be provided.

[Brief description of drawings]

FIG. 1 is a main part plan view showing a state before winding an insulating film in a flyback transformer shown as an embodiment of the present invention.

FIG. 2 is a plan view of an essential part of an insulating film.

FIG. 3 is a side view of the main part of the insulating film.

FIG. 4 is an enlarged sectional view of a main part of a flyback transformer.

[Fig. 5] Connection diagram of main parts of flyback transformer

FIG. 6 is a plan view showing an insulating film used in a conventional flyback transformer.

FIG. 7 is a plan view of a main part of a conventional insulating film.

FIG. 8 is a side view of a main part of a conventional insulating film.

FIG. 9 is a sectional view of a secondary high-voltage coil section of a conventional flyback transformer.

FIG. 10 is an enlarged cross-sectional view of the relevant part.

[Explanation of symbols]

 1 Primary coil 2a-2f Secondary high voltage coil 5 Insulation film 6 Notch

Claims (2)

[Claims] 1. As an insulating film used between each layer of a secondary high voltage coil which is divided into a plurality of layers and wound, a plurality of cutout portions, which are in contact with the secondary high voltage coil of each layer and which are in contact with the secondary high voltage coil, are oriented toward the center from the side end. A flyback transformer characterized by the provision of. 2. A plurality of cutouts are provided in a zigzag manner from both side ends on the winding start side of the insulating film toward the center, and the portions provided with these cutouts are wound so as to contact the secondary high voltage coil. The flyback transformer according to claim 1, wherein: