JPH0332900B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a flyback transformer used in a high voltage generating circuit of a television receiver or the like.

BACKGROUND ART In general, this type of flyback transformer has a primary low-voltage coil 2 wound around a magnetic core 1 as shown in FIG. The connected secondary high-voltage coil 4 was wound.

With such a configuration, the secondary high voltage coil 4 of the conventional flyback transformer is constructed by forming two layers of flat insulating films 7a on a bobbin 6 having flanges 5 at both ends, as shown in FIGS. 4 and 5. The coil 4a of one winding section is wound on top of the coil 4a, and the flat insulating film 7b is further wound thereon, and the coil 4b of the next winding section is wound on top of it, and this configuration is repeated several times and laminated. It was formed.

Problems to be Solved by the Invention In such a conventional configuration, the secondary high-voltage coil 4 is in close contact with the insulating film 7, and even if it is molded with insulating resin in vacuum in the final process, the insulating resin will not leak inside the secondary high-voltage coil 4. If pinholes or the like are present in the insulation coating of the windings that make up the secondary high-voltage coil 4 without sufficiently penetrating the secondary high-voltage coil 4, reliability may be compromised as dielectric breakdown may occur between the upper and lower layers where there is a potential difference, and furthermore, the insulating resin mold It took a long time to complete the process, resulting in poor workability.

The present invention eliminates the above-mentioned conventional drawbacks and aims to provide a flyback transformer that can be resin molded reliably and in a short time.

Means for Solving the Problem The present invention to solve this problem consists of an insulating film or a corrugated insulating film in which a magnetic core is divided into a plurality of primary low-voltage coils and each winding section is corrugated at least in part. The coil is laminated and wound through a combination of a flat insulating film and a secondary high-voltage coil with a rectifier diode connected in series between each winding section, and the entire structure is molded with resin.

Function: With this configuration, voids are formed in the corrugated insulating film, and the insulating resin easily penetrates into the interior of the secondary high-voltage coil to provide complete insulation.

Embodiment FIGS. 1 and 2 are a partially cutaway perspective view of a main part of a secondary high voltage coil portion of a flyback transformer according to an embodiment of the present invention, and a perspective view of an insulating film subjected to corrugation processing.

Since the basic structure of the flyback transformer is the same as that shown in FIG. 3, the explanation here will be omitted, and the same numbers will be given to the same structures as in the prior art. Reference numeral 8 denotes an insulating film in which at least a portion thereof is provided with a corrugated portion 9, which is a feature of the present invention, and the corrugated portion 9 of this insulating film 8 is approximately 1/2 of the entire portion.

This insulating film 8 is wound so that the corrugated part 9 is on top of the secondary high voltage coil 4 divided into a plurality of parts, and the surface on which the next winding is applied is a flat insulating film 8.
The wire is now flat, making it easier to wind the next section of wire.

A secondary high voltage coil 4 divided into a plurality of sections is laminated and wound using such an insulating film 8, and a rectifier diode 3 is connected in series between each winding section. The secondary high-voltage coil 4 is then assembled into the magnetic core 1 together with the primary low-voltage coil 2, and the whole is molded with insulating resin.

According to this configuration, a large number of voids 1 are formed in the corrugated section 9.
0 is formed, the insulating resin can quickly penetrate to the center of the secondary high-voltage coil 4, and reliable insulation processing can be performed.

Effects of the Invention As described above, the flyback transformer of the present invention has an insulating film which is at least partially corrugated between the windings divided into a plurality of secondary high voltage coils, or a corrugated insulating film and a flat insulating film. Because it uses a combination of films, it reliably penetrates into the interior of the secondary high-voltage coil during molding with insulating resin, resulting in excellent and stable insulation, and the workability of the resin mold is significantly improved. It is possible to achieve excellent productivity, and the winding work is easy because only one insulating film is wound, and there is a flat insulating film on the surface where the next winding is to be applied. Therefore, it has the advantage that the next winding can be done easily, and is of great practical value.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view of a main part of a secondary high-voltage coil section showing an embodiment of the flyback transformer of the present invention, FIG. 2 is a perspective view of an insulating film used in the secondary high-voltage coil section, and FIG. Figure 3 is an electrical circuit diagram showing a general flyback transformer, Figure 4 is a partially cutaway front view of the secondary high voltage coil of a conventional flyback transformer, and Figure 5 is a partially cutaway perspective view of the same main part. It is. 1... Magnetic core, 2... Primary low voltage coil, 3... Rectifier diode, 4... Secondary high voltage coil, 8... Insulating film, 9... Waveform processing section.

Claims (1)

[Claims] 1. The next winding is done so that the wave-processed part is on top of the primary low-voltage coil on the magnetic core, and an insulating film that is divided into a plurality of parts and each winding section is processed into a wave shape at least in part. A flyback transformer is made by laminating and winding a flat insulating film on the surface, winding a secondary high-voltage coil with a rectifier diode connected in series between each winding section, and molding the entire body in resin.