JPS5940744Y2 - flyback transformer - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a flyback transformer in which the insulating case is improved to improve the insulation between the magnetic core and the high-voltage portion of the high-voltage coil and to secure the magnetic core.

Figure 1 shows a conventional flyback transformer.

It was constructed as shown in Figure 2.

That is, a low-voltage bobbin 4 and a high-voltage coil 5 each have a low-voltage coil 3 wound around one magnetic leg of the magnetic core 2, which is formed by abutting two U-shaped cores made of ferrite or the like and forming an opening shape using a fastening fitting 1. A split-type high-pressure bobbin 6 that has been wound in sections is attached, and this is housed in an insulating case 7, and a bottom plate 8 is attached to the opening at the lower end of the insulating case 7.

A storage section 10 for storing a rectifying diode 9 is provided at the upper end of the high-pressure bobbin 6, and the insulating goosef is formed into a shape that follows the magnetic core 2, the low-pressure bobbin 4, and the high-pressure bobbin 6. Since the insulation creepage distance between the diode 9 connected to the high voltage output of the high voltage coil 5 and the magnetic core 2 is linear and short as shown by arrow A, dielectric breakdown often occurs in this part. Met.

Furthermore, since the magnetic core 2 and the insulating case 7 are simply fitted together by the magnetic legs of the magnetic core 2 to which no bobbin is attached and the insulating case 7, the magnetic core 2 tends to wobble due to variations in the dimensional accuracy of the magnetic core 2. .

The present invention eliminates the above-mentioned drawbacks of the prior art.

Hereinafter, an embodiment of the present invention is shown in FIG. 3 of the accompanying drawings.

This will be explained with reference to FIG.

Reference numeral 11 denotes a magnetic core formed by abutting two U-shaped cores made of ferrite or the like and forming an opening shape with a fastening fitting 12, and a low-voltage bobbin 14 with a low-voltage coil 13 wound around one magnetic leg of the magnetic core 11; A split-type high-voltage bobbin 16 in which a high-voltage coil 15 is wound in sections is attached.

A terminal pin 17 is implanted at the lower end of the low voltage bobbin 14, and a storage section 19 is formed at the upper end of the high voltage bobbin 16 to accommodate a rectifying diode 18 connected to the output end of the high voltage coil 15. .

This magnetic core 11. The transformer body, which is composed of a low voltage coil 13 and a high voltage coil 15, has an insulating case 2 with an open bottom.
0 is overlaid.

A protrusion 21 is provided on the upper surface of the insulating case 20 and covers the entire circumference of the magnetic core 11 , and a portion of the protrusion 21 is fitted between the magnetic core 11 and the high-voltage bobbin 16 .

A bottom plate 22 is attached to the opening at the lower end of the insulating case 20 to constitute a fly batter transformer.

With this configuration, the diode 18 and the magnetic core 11, which become the high voltage part of the high voltage coil 15, are connected to the insulating case 2.
The insulation creepage distance becomes significantly longer as shown by the arrow B due to the 0 protrusions 21, and no dielectric breakdown occurs in this portion.

As the flyback transformer of the present invention is constructed as described above, it is possible to ensure sufficient insulation between the high-voltage part of the high-voltage coil and the magnetic core, improving quality. It does not change the characteristics and can be highly reliable, which is of great practical value.

[Brief explanation of drawings]

Fig. 1 is a partially sectional top view of a conventional flyback transformer, Fig. 2 is a vertical sectional view thereof, Fig. 3 is a partially sectional top view showing an embodiment of the flyback transformer of the present invention, and Fig. 4 is a partially sectional top view of a conventional flyback transformer. The figure is a longitudinal sectional view of the same. 11...Magnetic core, 13...Low voltage coil,
14...Low pressure bobbin, 15...High voltage coil, 16...High pressure bobbin, 20...
Insulation case, 21... Projection.

Claims (1)

[Scope of utility model registration request] In a flyback transformer constructed by covering an insulating case over the transformer body, which is constructed by incorporating a low-voltage bobbin in which a low-voltage coil is wound around a magnetic core and a high-voltage bobbin in which a high-voltage coil is wound, a -tUt core is placed on the upper end surface of the insulating case. A flyback transformer has a protrusion that fits around the entire upper part of the transformer, and a part of the protrusion is inserted between the magnetic core and the high-pressure bobbin.