JPS6214651Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a flyback transformer in which a high voltage winding is wound around a section-wound bobbin.

As is well known, section winding bobbins are provided with a wire transfer section for transferring the high voltage winding from one section to the next. Figure 1A
and B show an example of a conventional section-wound high-pressure bobbin. In the figure, 1 indicates the entire high-pressure bobbin, 2 indicates the cylindrical bobbin body, 3 indicates the required number of flanges provided on this bobbin body 2, and 4 5 is the wire transfer portion of the high voltage winding, and 5 is the high voltage winding. The conventional wire transfer portion 4 is of a type in which a part of each collar portion (excluding the flanges at both ends) 3 is cut out slightly diagonally up to the bobbin body 2, and therefore, the high voltage winding 5 in the wire transfer portion 4 is The creepage distance is not much different from the wall thickness of the flange 3. Considering that the wall thickness of the section-wound bobbin of a general small flyback transformer is about 0.8 to 1.0 mm, it is easy to see how short the creepage distance of the high-voltage winding is at the wire transfer section. For this reason, if the adhesion of resin or the like to the bobbin is poor, there is a risk that creeping discharge will occur in the line transfer area.

An object of the present invention is to provide a flyback transformer in which the creepage distance of the line transfer portion of a section-wound high-pressure bobbin is increased.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2A and 2B show an embodiment of a section-wound high-pressure bobbin of a flyback transformer according to the present invention. In the figures, 1 indicates the entire high-pressure bobbin, 2 indicates the cylindrical bobbin body, and 3 indicates the bobbin body 2. The required number of flanges are provided in the figure, 4 is a wire transfer portion of the high voltage winding, and 5 is the high voltage winding. In the present invention, in the section-wound high-pressure bobbin 1 having such a configuration, the line transfer portion 4 is provided with a convex ridge 6 that is lower than the height of the flange portion 3 and thinner than the wall thickness of the flange portion 3. It was set up so as to block the

With this configuration, the wall thickness of the flange 3 is 0.8 to 1.0 mm as described above, so if the thickness of the convex levee 6 is 1/2 of the flange 3 and the height is hmm, then The creepage distance of the bottom of the high-voltage winding in the wire transfer section 4 is the height of the raised levee 6 (hmm x 2) + the wall thickness of the raised levee 6 (0.4
~0.5 mm), so the creepage distance increases by approximately twice the height of the convex ridge 6 compared to the conventional bobbin. FIG. 3 is an explanatory diagram showing a comparison of the creepage distances, where A shows the creepage distance of the bobbin according to the present invention, and B shows the creepage distance of the conventional bobbin. In the case of the present invention, the high-voltage winding 5 runs along the convex levee 6 and passes through the line transition portion, so the creepage distance increases by approximately twice the height of the levee 6. Even if the height of the convex ridge 6 is made to be about the same as the wall thickness of the flange 3, the creepage distance is three times that of a conventional bobbin, so the creepage distance has increased dramatically. Therefore, since the creeping withstand voltage increases considerably, there is no risk of creeping discharge occurring, and reliability is improved. Furthermore, since the withstand voltage between each high-voltage winding increases, the number of turns in one section can be increased, and the high-voltage bobbin can be further miniaturized. Furthermore, a convex ridge thinner than the wall thickness of the flange is provided at the wire transition area, and the high voltage winding wire passing through the line transition area passes over the convex ridge and moves to the next winding groove to be wound. In this case, the thickness of the part (of the flange) obtained by subtracting the thickness of the convex levee from the wall thickness of the flange protects the part (the high-voltage winding is not wound in between), and wire transfer occurs. Even if the high-voltage winding passing through the wire transfer section occasionally floats up a little relative to the bobbin body, unnecessary forces such as winding tension will not be applied to the high-voltage winding at the wire transfer section, and the high-voltage winding at the wire transfer section will This can prevent wire breakage, damage, etc. Furthermore, since the convex levee is simply provided at the line transfer portion, there are many excellent advantages such as no problems in manufacturing the bobbin.

As described above, according to the present invention, the creeping pressure resistance of the section-wound high-pressure bobbin is increased and the reliability is improved, so that it has great practical value when used in various small-sized flyback transformers.

[Brief explanation of the drawing]

1A and B are schematic plan views and front views showing an example of a conventional section-wound high-pressure bobbin of a flyback transformer, and FIGS. 2A and B are an embodiment of a section-wound high-pressure bobbin of a flyback transformer according to the present invention. Figure 3 shows a comparison of the creepage distance at the line transfer portion of the high-pressure bobbin, where A shows the creepage distance according to the present invention and B shows the conventional creepage distance. FIG. 1...Section winding high pressure bobbin, 2...Bobbin body, 3...Bobbin flange, 4...Line transfer part,
5... High voltage winding, 6... Convex embankment.

Claims (1)

[Scope of utility model registration request] In a flyback transformer in which a high-voltage winding is wound around a section-wound bobbin, a convex ridge is formed at the line transfer portion of the bobbin, which is lower than the height of the bobbin flange and thinner than the wall thickness of the bobbin flange. A flyback transformer which is provided so as to close a part of the line and increase the creepage distance of the line transfer part.