KR0160569B1 - Flyback transformer - Google Patents

Abstract

The present invention provides a flyback transformer having a configuration capable of reducing the cost and effort required for assembly.

The flyback trances according to the invention are each viewed from the side It is composed of a pair of cores 1 having a shape and connected in a state where the respective portions 1a and 1b are opposed to each other, and at least one side portion 1a of each of the cores 1 comprises a conductive material-added adhesive ( 15), and the conductive material additive adhesive 15 is produced by adding 1 to 15 wt% of a conductive material to the insulating adhesive.

Description

Flyback trance

1 is a cross-sectional view showing the overall structure of the FBT according to the present embodiment.

2 is a side view showing the assembled state of the core constituting the FBT according to the first modification.

3 is a side view showing the assembled state of the core constituting the FBT according to the second modification.

4 is an explanatory diagram showing the relationship between the amount of the conductive material added to the adhesive strength.

Figure 5 is a perspective view showing the appearance of the FBT according to the prior art.

6 is a cross-sectional view showing the overall structure of the FBT according to the prior art.

7 is a side view showing the assembled state of the core constituting the FBT according to the conventional variant.

* Explanation of symbols for main parts of the drawings

1: Core 1a: Each part on one side

15: conductive material additive adhesive

[Industrial use]

The present invention relates to a flyback transformer (hereinafter referred to as FBT), and more particularly to a connection structure of the core constituting it.

[Traditional Technology and Problems]

Background Art Conventionally, FBT is known to play a role of horizontally deflected output transformer by supplying a DC high voltage to the anode of a cathode ray tube such as a television receiver. That is, this FBT is viewed from the side as shown in Figs. 5 and 6, respectively. On the primary side, a pair of ferrite cores 1, which are arranged in a shape above each other opposite to each other, and the corner portions 1b on the other side of the cores 1, on which one corner portion 1a is exposed to the outside, are inserted. The low pressure coil part 2, the high pressure coil part 3 of the secondary side which externally inserted this low pressure coil part 2, and the insulating resin (not shown) on the periphery of this high pressure coil part 3 are enclosed. The case 4 is provided, and necessary parts (not shown), such as a high-pressure rectifying diode, a condenser, and a drop, are disposed in the case 4. Reference numeral 5 in FIG. 5 denotes a focus bag assembled with respect to the FBT.

Each of the pair of cores 1 is bonded to each of the portions 1a and 1b by an insulating adhesive 7 such as silicone, acrylic, epoxy, or the like, through the insulating cap 6. The corner portions 1a of one side exposed out of the case 4 are viewed from the side. It is integrated by being clamped by the metal spring 8 made into a magnetic shape. Moreover, the insulating cap 6 is for preventing the magnetic saturation of the core 1 used as a magnetic flux path | path, and is inserted in between the each part 1a, 1b of both sides or one side. In addition, the metal spring 8 here also plays a role of conducting the core 1 arrange | positioned above with respect to the lower core 1 connected with earth.

On the other hand, the low-pressure coil part 2 constituting this FBT section (divided) wraps the conducting wire 10 such as enameled copper wire with respect to the cylindrical bobbin 9 made of an insulating resin made of a cylindrical shape or the like. The terminal pin of each conductive wire 10 wound between section edges formed on the outer surface of the cylindrical bobbin 9 is drawn out to the lower side of the cylindrical bobbin 9 and then protruded to the flange portion 9a. It is connected about each of (11). In addition, the high pressure coil portion 3 is formed by winding a conductor 13 such as an enameled copper wire with respect to a cylindrical bobbin 12 made of an insulating resin, and has a low pressure coil portion 2 in the cylindrical bobbin 12. ) Is to be inserted.

By the way, in this conventional example, although the upper and lower pairs of cores 1 which comprise an FBT are connected by the metal spring 8, it is not limited to such a structure, The conventional modified example shown in FIG. As described above, the conductive adhesive 14 is applied onto the respective portions 1a of the cores 1 exposed to the outside of the case 4 without using the metal spring 8, and then the conductive adhesive 14 is applied. The structure which makes the core 1 of the lower side and upper side conduct is also employ | adopted.

However, in the FBT shown in FIGS. 5 and 6, the upper and lower pairs of the cores 1, to which the corner portions 1a and 1b are bonded to each other by using the insulating adhesive 7, are formed by the metal springs 8. In order to conduct electrical conduction, it is necessary to prepare especially the metal spring 8 as a separate component, and to support the cores 1 by sandwiching them, and as a result, parts cost rises and the labor at the time of assembly increases. In addition, also in the FBT shown in FIG. 7 in which the cores 1 are connected by using the conductive adhesive 14 instead of the metal spring 8, the respective portions of the core 1 using the insulating adhesive 7 ( Since it is necessary to apply the conductive adhesive 14 in a step different from the step of joining 1a and 1b), it has been inevitably inevitable that the cost and effort will be increased.

[Purpose of invention]

The present invention has been made in view of the above-described point, and an object thereof is to provide an FBT having a configuration capable of reducing the cost and effort required for assembly.

[Configuration of Invention]

The present invention for achieving the above object is each viewed from the side In an FBT comprising a pair of cores having a magnetic shape and connected in opposing states, at least one side of each of the cores is bonded using a conductive material additive adhesive, and the conductive material additive adhesive Is characterized in that it is produced by adding 1 to 15wt% conductive material to the insulating adhesive.

[Action]

In the present invention configured as described above, at least one side of each of the cores facing each other is joined to each other using a conductive material additive adhesive, so that the pair of cores are connected to each other after the conductive material additive adhesive is mediated. .

EXAMPLE

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

1 is a cross-sectional view showing the overall structure of the FBT according to an embodiment of the present invention, Figure 2 is a side view showing the assembly state of the core constituting the FBT according to the first modification, Figure 3 is a FBT according to the second modification It is a side view which shows the core assembly state which comprises. In addition, since the overall structure and components of the FBT according to the present embodiment and the modification are not fundamentally different from those of the conventional example, the same or equivalent parts as those in FIGS. 5 to 7 in FIGS. 1 to 3, The same code | symbol is attached | subjected to a part and detailed description here is abbreviate | omitted.

As in the conventional example, the FBT according to the present embodiment is viewed from the side, respectively. The low-pressure coil portion 2 into which the upper and lower pairs of cores 1 and the other corner portions 1b of each of the cores 1 are inserted while being in a shape of a shape and the corner portions 1a and 1b are opposed to each other are inserted. And a case (4) filled with an insulating resin (not shown) surrounded by the high pressure coil portion (3) inserted outside the low pressure coil portion (2), and then surrounded by the high pressure coil portion (3). Each part 1a of each side of the core 1 is exposed to the outside of the case 4.

The insulating cap 6 is sandwiched between the respective portions 1a and 1b of the core 1, and the respective portions of the core 1 inserted into the cylindrical bobbin 9 of the low pressure coil portion 2 are formed. 1b) are bonded together using insulating adhesive 7, such as silicone type, acryl type, and epoxy type.

Moreover, each part 1a of each side of each of the cores 1 exposed outside the case 4 is joined by using the electrically conductive material additive adhesive 15, The electrically conductive material addition adhesive 15 is a silicone type, It is produced by adding 1 to 15 wt% of conductive material to insulating adhesive such as acrylic or epoxy. At this time, as the conductive material, a carbon powder such as pies black, carbon black, or acrylic black, or a metal powder such as nickel, silver, molybdenum, aluminum, or the like is used, and the conductive material-added adhesive 15 is conductive. It is obtained by performing a sufficient stirring operation with respect to the insulating adhesive agent with which the ash was added. Moreover, of course, the addition ratio of a electrically conductive material changes based on the diameter which it has.

4 is an explanatory view showing the relationship between the adhesive strength between the cores 1 and the amount of the conductive material added to the conductive material-added adhesive 15, which is a conductive material for the silicone-based liquid thermosetting adhesive as the insulating adhesive. The result at the time of carrying out the tensile strength test after preparing the electrically conductive material addition adhesive 15 which adds black, after apply | coating the electrically conductive material addition adhesive 15 of thickness 50micrometer between cores 1 is shown. 4, the adhesive strength increases by the strengthening action of carbon as the conductive material until the amount of the conductive material added in the conductive material additive adhesive 15 reaches 5 wt%, while the amount of the conductive material added is 5 wt%. If the increase is continued beyond this, it is apparent that a decrease in the adhesive strength occurs.

In the present invention, the FBT also varies depending on the type and use of the FBT. However, the upper limit of the amount of the conductive material added is 15 wt%, considering that the adhesive strength between the cores 1 is 15 kgf / cm 2 or more. . In this case, the commercially available conductive adhesive 14 is not used because the usual conductive adhesive 4 contains 20 to 80 wt% of a conductive material, which deteriorates strength and moisture resistance.

In other words, the upper and lower pairs of cores 1 constituting the FBT according to the present embodiment are each of the respective corner portions 1b regardless of whether the corner portions 1b on the other side are joined by the insulating adhesive 7. Since 1a) is bonded together using the electrically conductive material addition adhesive 15, the cores 1 become conductive. According to an experiment conducted by the inventor of the present invention, the parts 1a having a gap of about 0.5 mm are used by using a conductive material-added adhesive 15 formed by adding 4 wt% of carbon powder to a silicone-based insulating adhesive. Also in the case of joining, it has been confirmed that conduction between the cores 1 can be ensured. By the way, in FBT which concerns on a present Example, as shown in FIG. 1, only one corner part 1a is bonded by the electrically conductive material additive adhesive 15. However, it is not limited to this, The corner part of the other side is not limited to this. It goes without saying that the (1b) may be bonded to each other by the conductive material additive adhesive 15 or the respective portions 1a and 1b on one side and the other side may be bonded to each other by the conductive material additive adhesive 15.

Moreover, in the FBT shown in FIG. 1, the insulating cap 6 is sandwiched between the corners la on one side of each of the cores 1, but, for example, as shown in FIG. 2, the insulating cap 6 ) May be bonded to each other by the conductive material-added adhesive 15 without each device being fitted. Furthermore, as shown in FIG. 3, of course, the conductive cap 16 may be sandwiched and fixed between the corner portions 1a to be joined using the conductive material-added adhesive 15.

[Effects of the Invention]

As described above, according to the FBT according to the present invention, at least one side of each pair of cores connected to each other disposed on the opposite side uses an electrically conductive material additive adhesive in which 1 to 15 wt% of a conductive material is added to the insulating adhesive. Since a pair of cores are mutually bonded, these pairs of cores are made to conduct, and they conduct | conductive after mediating an electrically conductive material addition adhesive agent. Therefore, there is no need to conduct conduction between cores after using the metal spring or the conductive adhesive as in the conventional example, and the effect of reducing the cost and effort required at the time of assembly can be obtained.

Claims (1)

Each viewed from the side In a flyback transformer having a shape of a core and having a pair of cores 1 connected in a state in which the respective portions 1a and 1b face each other, at least one side portion of each of the cores 1a is electrically conductive. A flyback transformer, characterized in that it is bonded by using the additional adhesive (15), wherein the conductive material additive adhesive (15) is made by adding 1 to 15 wt% of the conductive material to the insulating adhesive.