JPH04314314A - Flyback transformer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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 as a high voltage generator for display devices such as television receivers.

0002

2. Description of the Related Art A flyback transformer has a pair of substantially U-shaped cores and is constructed so that the cores are brought into contact with each other to form a closed magnetic path. A coil wound around a bobbin is disposed around the butt portion.

[0003] When this transformer is in operation, a high voltage is generated, and a high voltage is induced in the core used therein. Therefore, in order to remove the induced voltage,
Generally, the core of the flyback transformer is grounded. This core is provided with a gap to improve its magnetic saturation. This gap is often made of an insulating material such as polyester film. Therefore, in order to ground the aforementioned cores, it is necessary to establish electrical continuity between the opposing cores since they are divided by a gap in the insulating material.

FIG. 2A shows the configuration of a conventional flyback transformer. A gap material 3, which is an insulating material (polyester film), is provided at the butting portion of the U-shaped cores 1a and 1b, and a conductive adhesive 4 is provided around the gap material 3.
covered with. This electrically connects the cores 1a and 1b. In this example, conductive adhesive 4 is applied to both sides of the opposing cores as a means to make the divided cores conductive.
However, since the insulating material 3 was placed in the middle of the gap, it was necessary to apply a considerable amount of the conductive adhesive 4 not only to the joint surfaces but also around the core.

FIG. 2B shows another example of electrically and mechanically coupling the cores 1a and 1b. In this example, the cores 1a and 1b are electrically connected and fixed using a metal spring 5. However, in this case, since the connection is only mechanical, an adhesive 6 is applied to the connecting part between the spring 5 and the cores 1a and 1b (see figure (C)) to prevent vibration and fall off of the cores 1a and 1b. It was a hassle to have to apply it. In order to improve this, groove 7 (see figure (
There is also a method of providing grooves (see D), but in this case, the effective cross-sectional area of the core in the portion where the grooves are provided is reduced, which has the disadvantage that the inherent characteristics of the core are disadvantageous.

[0006]

[Problem to be Solved by the Invention] When electrically connecting divided cores, when using conductive adhesive, there is a disadvantage that multiple adhesives are required around the gap, and when using a spring, There is a problem that adhesive for fixing is required, and when providing a core groove, there is a problem that the cross-sectional area of the core becomes disadvantageous.

[0007] Therefore, the present invention uses a non-magnetic and conductive material such as aluminum for the gap to easily electrically connect the divided cores and also mechanically join them. The purpose is to provide a flyback transformer that can

[0008]

[Means for Solving the Problems] The present invention provides a flyback transformer in which a wire is wound around a joint portion of a divided core, in which a conductive and The structure is such that a non-magnetic gap material is provided.

[0009]

[Operation] By using the above method, since the gap part of the core is made of a non-magnetic conductive material, the magnetic performance does not deteriorate the original magnetic properties of the core, and electrically conductive material is used. Because of this, good conduction between the cores can be obtained.

0010

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. First, the overall configuration shown in FIG. 3(A) will be explained. A pair of U-shaped cores 1a and 1b have their end surfaces butted against each other. In this case, a winding body 2 wound around a bobbin is arranged around one of the abutting portions. The winding body 2 has a primary coil and a secondary coil, and a high voltage can be taken out from the secondary coil side.

[0012] There is a gap A at the abutting portion of the cores 1a and 1b.
There are a and Ab, and these parts are filled with the material described below in the butting operation. That is, as shown in FIG. 3B, an adhesive (which may be conductive or non-conductive) 4a is first placed on the end surface of one core 1a, and then a non-magnetic and conductive gap member 3 is placed on the end surface of one core 1a. (e.g. aluminum)
is applied, and then adhesive 4b is applied again. In this state, when the end face of the other core 1b is crimped, the same figure (C
), both cores 1a are connected via the gap member 3.
, 1b are electrically connected and mechanically fixed by the adhesive that has flowed into the periphery.

[0013] By applying the above means to the abutting portions, there is no need for a large amount of conductive adhesive around the gap portions as in the prior art, and there is no need for troublesome bonding using springs and adhesives. Further, there is no need to provide a groove in the core, and the cross-sectional area of the core is not impaired, and the divided cores can be electrically and mechanically connected well.

[0014]

[Effect of the invention] As explained above, according to this invention,
By using a non-magnetic, electrically conductive material, such as aluminum, for the gap, the split cores can be easily electrically connected and mechanically joined.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention;
) is an explanatory diagram of the overall configuration, and (B) and (C) are explanatory diagrams showing the assembly process of the transformer of the present invention.

FIG. 2 is an explanatory diagram showing a conventional flyback transformer; (A) and (B) are diagrams showing different types, and (C) and (D) are explanatory diagrams showing a method of fixing a spring. .

[Explanation of symbols]

1a, 1b...core, 2...winding body, 3...gap member, 4
…glue.

Claims (1)

[Claims] 1. In a flyback transformer in which a wire is wound around a joint portion of a divided core, a conductive and non-magnetic gap material is disposed in a gap between the joint portions. A flyback transformer characterized by being installed.