KR101101590B1 - Transformer - Google Patents

Abstract

The present invention relates to a transformer capable of driving a plurality of lamps with a single transformer by stacking secondary coils in multiple layers to increase the number of output terminals. For this purpose, the transformer according to the present invention is tubular in shape and has a plurality of slits on its outer circumferential surface. The primary bobbin is formed, the primary coil wound on the outer periphery of the primary bobbin, the secondary bobbin tubularly formed with a plurality of slits on the outer circumferential surface, the first secondary coil inserted into the slit of the secondary bobbin, the outer peripheral surface of the first secondary coil The first outer layer bobbin is fixed to the secondary bobbin and a plurality of slits are formed on the outer peripheral surface, the second secondary coil wound on the slit of the first outer layer bobbin, is formed to surround the outer peripheral surface of the second secondary coil, the first outer layer bobbin A second outer layer bobbin fitted and fixed to at least one slit formed in the third secondary coil wound around the second outer layer bobbin, and a primary The first outer layer bobbin, comprising: a core that is inserted into the blank and the secondary bobbin forms a magnetic path is characterized in that fitted to at least one of the slit formed in the secondary bobbin.

Description

Transformer

The present invention relates to a transformer, and more particularly, to a transformer capable of driving a plurality of lamps as a single transformer by increasing the number of output terminals by stacking secondary coils in multiple layers.

With the development of the information industry, display devices are also radically developing. Among display devices, LCD displays are widely used due to their light weight and low power consumption.

The liquid crystal display includes a backlight unit for forming light and a liquid crystal panel for displaying an image using the light.

The backlight unit includes a light source for forming light, an inverter circuit unit for driving the light source, an optical member for uniformly providing light to the liquid crystal panel, and the like. Here, the inverter circuit unit is provided with a transformer for receiving a low voltage alternating current and converting it into a high voltage alternating current capable of driving a light source.

In the conventional case, since a transformer has only one or two output terminals per one, one transformer provides power to one or two light sources. Therefore, when the number of lamps required increases as the display device is enlarged, the number of transformers is correspondingly increased. As a result, not only the price of the display device employing the transformer is increased but also the volume of the transformer occupying the display device is increased.

In particular, a display device using six lamps (or three 'U' shaped lamps) has conventionally had to use two transformers having two outputs or three transformers having one output. However, when two transformers having two outputs are used, one output remains, resulting in a problem that the current balance is broken. When three transformers having one output are used, the transformer is increased to increase the overall display device. There is a problem that the volume increases.

It is an object of the present invention to provide a transformer capable of driving six lamps (or three 'U' shaped lamps) using one transformer.

Transformer according to the present invention is a tubular tubular primary bobbin is formed with a plurality of slits on the outer peripheral surface, the primary coil wound on the outer periphery of the primary bobbin, a secondary bobbin tubular is formed in the outer peripheral surface, the secondary bobbin is inserted into the slits of the secondary bobbin The first secondary coil to be wound, the first outer coil surrounding the outer circumferential surface of the first secondary coil and fixed to the secondary bobbin, a plurality of slits are formed on the outer circumferential surface, the second secondary coil wound to the slit of the first outer layer bobbin, the second secondary A second outer layer bobbin that is formed to surround the outer circumferential surface of the coil and fitted into at least one slit formed in the first outer layer bobbin, the third secondary coil wound around the second outer layer bobbin, and the inside of the primary bobbin and the secondary bobbin And a core inserted into the core to form a path, wherein the first outer layer bobbin is fitted to at least one of the slits formed in the secondary bobbin. It shall be.

In the present invention, the second outer layer bobbin is provided with at least one fitting protrusion protruding along the winding direction at the center of the inner surface in contact with the second secondary coil, and is fitted with the first outer layer bobbin through the fitting protrusion. It is done.

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In the present invention, the second outer layer bobbin is provided on the inner surface in contact with the second secondary coil and has a plurality of fitting protrusions formed at positions corresponding to the slits of the first outer layer bobbin, the second secondary coil is wound It is preferable that the fitting projections are fitted to the slit.

In the present invention, the fitting protrusion of the first outer layer bobbin may be press-fitted into at least one slit formed in the first outer layer bobbin.

In the present invention, it is preferable that the secondary bobbin includes partitions at both ends, and the secondary winding accommodating part in which the first secondary coil is received and wound is formed by the partition walls.

In the present invention, it is preferable that the first outer layer bobbin and the second outer layer bobbin are received and fixed to the secondary winding receiving portion.

In the present invention, the first outer layer bobbin and the second outer layer bobbin may each be divided into at least two sub bobbins.

In this case, the sub bobbins may be coupled to each other by an adhesive member, or may be coupled to each other by welding.

In the present invention, the first outer layer bobbin and the second outer layer bobbin are preferably formed of an insulating resin.

In the present invention, the second outer layer bobbin may be formed with a plurality of slits on the outer peripheral surface.

In the present invention, the primary bobbin and the secondary bobbin may be arranged in a line along the longitudinal direction, in which case the primary bobbin and the secondary bobbin may be arranged in one tube and separated on both sides of the tube.

In the present invention, the primary bobbin and the secondary bobbin may be arranged parallel to each other.

The transformer according to the present invention can increase the number of output terminals per transformer by having a laminated outer bobbin, thereby not only securing the price competitiveness of the display device employing the transformer, but also reducing the volume of the transformer. Can be.

In particular, in the present invention, since the outer bobbin is fixedly coupled by the fitting protrusion formed on the outer bobbin and the slits formed to wind the coil, there is no need to provide a separate groove or slit for engaging the outer bobbin. Therefore, the manufacturing and joining process of the component can be carried out very easily.

In addition, by arranging a plurality of slits in the outer bobbin at even intervals, the coils are uniformly wound, so that not only the current balance can be maintained but also the short circuit between the wound coils can be prevented to ensure the reliability of the transformer. have.

1 is an exploded perspective view of a transformer according to an embodiment of the present invention.
FIG. 2 is a plan view of the transformer shown in FIG. 1. FIG.
3 is a partial cross-sectional view taken along line II ′ of FIG. 2;
4 is a partially exploded perspective view of the transformer shown in FIG. 1.
FIG. 5 is a partial cross-sectional perspective view of the transformer shown in FIG. 1. FIG.
6 is an exploded perspective view of a transformer according to another embodiment of the present invention.
7 is a perspective view of a transformer according to another embodiment of the present invention.

Prior to the detailed description of the present invention, the terms or words used in the present specification and claims should not be construed as limited to ordinary or preliminary meaning, and the inventor may designate his own invention in the best way It should be construed in accordance with the technical idea of the present invention based on the principle that it can be appropriately defined as a concept of a term to describe it. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention, and are not intended to represent all of the technical ideas of the present invention. Therefore, various equivalents It should be understood that water and variations may be present.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this case, it should be noted that like elements are denoted by like reference numerals as much as possible. In addition, detailed descriptions of well-known functions and configurations that may blur the gist of the present invention will be omitted. For the same reason, some components in the accompanying drawings are exaggerated, omitted, or schematically illustrated, and the size of each component does not entirely reflect the actual size.

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

1 to 5 are views for explaining a transformer according to an embodiment of the present invention, Figure 1 is an exploded perspective view of a transformer according to an embodiment of the present invention, Figure 2 is a view of the transformer shown in FIG. Top view. 3 is a partial cross-sectional view taken along line II ′ of FIG. 2, FIG. 4 is a partially exploded perspective view of the transformer shown in FIG. 1, and FIG. 5 is a partial cross-sectional perspective view of the transformer shown in FIG. 1.

1 to 5, a transformer 100 according to an embodiment of the present invention includes a primary bobbin 10, a secondary bobbin 20, and a core 50, in addition to the secondary bobbin 20. It is configured to include a first outer layer bobbin 30 and the second outer layer bobbin 40 is fastened to.

In this embodiment, the primary bobbin 10 and the secondary bobbin 20 consist of one pipe. That is, the primary bobbin 10 and the secondary bobbin 20 are arranged on both sides of the tube on one tube. However, the present invention is not limited thereto, and various applications are possible, such that the primary bobbin 10 and the secondary bobbin 20 are separated from each other and arranged in a line.

Primary bobbin 10 is formed on one side of the tube, at least one slit 19 is formed on the outer peripheral surface. The slits 19 are arranged at regular intervals on the outer circumferential surface of the primary bobbin 10, and each of the slits 19 is formed with a primary coil 15 wound with a coil. By these slits 19 the primary coil 15 is uniformly distributed and wound on the primary bobbin 10.

Secondary bobbin 20 is formed on the other side of the tube, a plurality of slits 29 are formed on the outer peripheral surface. The slits 29 are arranged at regular intervals on the outer circumference of the secondary bobbin 20, and each of the slits 29 is formed with a first secondary coil 25 wound with a coil. By these slits 29, the first secondary coil 25 is uniformly distributed and wound on the secondary bobbin 20.

The primary bobbin 10 and the secondary bobbin 20 may have a predetermined spaced space therebetween, and the partition wall 95 may be further disposed in the spaced space. The partition wall 95 may minimize the influence of the voltage generated between the primary coil and the first secondary coil 25.

In addition, partitions 95 are formed at both ends of the primary bobbin 10 and the secondary bobbin 20. Due to the partitions 95, the primary bobbin 10 and the secondary bobbin 20 form receiving portions 12 and 22 through which coils can be wound. That is, the primary winding receiving portion 12 is formed in the primary bobbin 10 by the partition walls 95, and the secondary winding receiving portion 22 is formed in the secondary bobbin 20.

Hereinafter, for convenience of description, the primary bobbin 10 and the secondary bobbin 20 will be collectively referred to as inner bobbins 10 and 20 and will be described.

As described above, the inner bobbins 10 and 20 are formed in one tube. Therefore, a through hole 5 is formed in the inside of the tube, and a core 50 forming a magnetic path is inserted into the through hole 5. The core 50 may be provided in pairs. Here, the pair of cores 50 may be inserted through the through holes 5 formed at both ends of the inner bobbins 10 and 20 to face each other and may be fastened.

The core 50 may have a shape of 'E' shape, 'U' shape, 'U' and 'I' shape. In addition, the core 50 may be formed of Mn-Zn-based ferrite having high permeability, low loss, high saturation magnetic flux density, stability, and low production cost compared to other materials. However, the embodiment of the present invention is not limited to the shape or material of the core 50.

In addition, although not shown in the drawings, the core 50 according to the present embodiment may further include a core cap for accommodating the core 50. The core cap is made of an insulating material and is formed to accommodate the core 50 therein. When the core cap is provided, insulation reliability between the core 50 and the output terminal 70 and between the core 50 and the first secondary coil 25 can be ensured, so that corona discharge occurs during the transformer operation. It can prevent.

The first outer layer bobbin 30 is tubular, and is fixedly coupled on the secondary bobbin 20 to surround the outer circumferential surface of the secondary bobbin 20 on which the first secondary coil 25 is wound. That is, the first secondary coil 25 wound on the secondary bobbin 20 is inserted into the through hole formed in the first outer layer bobbin 30.

The first outer layer bobbin 30 is formed by combining a plurality of divided sub bobbins 30a and 30b. That is, one first outer bobbin 30 is divided into at least two sub bobbins 30a and 30b, and the divided western bobbins 30a and 30b may be joined through an adhesive member (not shown). It can be joined by welding (eg laser welding, etc.). However, since the first outer layer bobbin 30 according to the present invention may be fixedly fastened to the secondary bobbin 20 through the fitting protrusion 38 to be described below, the sub bobbins 30a and 30b may be used even if they are not bonded to each other. Do.

In addition, in this embodiment, the case where the 1st outer layer bobbin 30 consists of two sub bobbins 30a and 30b is taken as an example. That is, the first outer bobbin 30 is formed by combining the first sub bobbin 30a and the second sub bobbin 30a formed in the same symmetrical shape. The first sub bobbin 30a and the second sub bobbin 30b are each formed in a semicircle in cross section. Therefore, when the first sub bobbin 30a and the second sub bobbin 30b surround the secondary bobbin 20 and are combined, the cross section completes the shape of a circle.

In addition, a second secondary coil 35 having a coil wound is formed on an outer circumferential surface of the first outer layer bobbin 30. In this case, in order to uniformly wind the second secondary coil 35 on the first outer layer bobbin 30, the first outer layer bobbin 30 may include a plurality of slits 39 disposed at regular intervals on the outer circumference. Can be. Since the second secondary coils 35 are uniformly wound and disposed in a space that is uniformly divided through the slits 39, current balance may be maintained. The same applies to the second outer bobbin 40 described later.

Meanwhile, the transformer 100 according to the present invention is characterized in that at least one fitting protrusion 38 is formed on an inner surface of the first outer bobbin 30, that is, a surface facing the first secondary coil 25. . The fitting protrusion 38 according to the present embodiment is formed to protrude along the winding direction from the inner surface and is inserted into and inserted into any one of the slits 29 formed in the facing secondary bobbin 20. In this embodiment, the fitting protrusion 38 of the first outer layer bobbin 30 is fitted to the slit 29 (hereinafter, referred to as a center slit) formed at the center of the secondary bobbin 20 and fixed. In this case, an adhesive may be interposed between the fitting protrusion 38 and the slit 29 into which the fitting protrusion 38 is inserted so that the first outer layer bobbin 30 may be more firmly fixed to the secondary bobbin 20.

In addition, the fitting protrusion 38 may be formed in an asymmetric shape that becomes narrower toward the end without forming the fitting protrusion 38 in a predetermined thickness so that the slit 29 and the fitting protrusion 38 are press-fitted by a constant force. In this case, it is preferable that the fitting protrusion 38 of the part which the inner surface of the 1st outer layer bobbin 30 contact | connects is formed slightly thicker than the width of the slit 29.

As described above, the transformer 100 according to the present embodiment uses the slits 29 formed to wind the coil on the outer surface of the secondary bobbin 20, so that the first outer layer bobbin 30 is fixed, so that the first outer layer bobbin ( There is no need to have a separate groove or slit to engage with 30). Therefore, the manufacturing and joining process of the component can be carried out very easily.

 The second outer layer bobbin 40 is fastened on the first outer layer bobbin 30 to surround the outer circumferential surface of the first outer layer bobbin 30 on which the second secondary coil 35 is wound. On the outer circumferential surface of the second outer bobbin 40, a third secondary coil 45 having a coil wound is formed. Like the first outer bobbin 30, the second outer bobbin 40 has a plurality of slits 49 arranged at regular intervals on the outer circumference to uniformly wind the third secondary coil 45 on the outer circumferential surface. can do.

Specifically, at least one fitting protrusion 48 is formed on the inner surface of the second outer layer bobbin 40 and is inserted into any one of the slits 39 formed on the outer circumferential surface of the first outer layer bobbin 30 facing each other. Will be fitted. In the present embodiment, the fitting protrusion 48 of the second outer layer bobbin 40 is fitted and fixed to the slit 39 (hereinafter, referred to as a center slit) formed at the center of the first outer layer bobbin 30.

The second outer layer bobbin 40 is formed in a structure very similar to the first outer layer bobbin 30 described above, as shown in the figure, is fixed to the outer peripheral surface of the first outer layer bobbin 30, not the secondary bobbin 20 The only difference is that they are formed differently in size. Therefore, the structure, the manner of coupling, and the like are all made in the same manner as described in the first outer bobbin 30.

Hereinafter, for convenience of description, the first outer bobbin 30 and the second outer bobbin 40 will be collectively referred to as outer bobbins 30 and 40 and will be described.

Referring to the drawings, the fitting protrusions 38 and 48 according to the present embodiment are arranged along the center slits 29 and 39 into which the fitting protrusions 38 and 48 are inserted at the inner surfaces of the outer bobbins 30 and 40. The case of forming in a line is taken as an example. However, the present invention is not limited thereto, and it may be formed at a position biased to one side so as to fit into the other slits 29 and 39 instead of the center slits 29 and 39, and a plurality of slits other than one slits 29 and 39 may be formed. Various applications are possible, such as forming fitting projections 38 and 48 so as to be fitted to (29, 39).

The outer bobbins 30 and 40 according to the present exemplary embodiment may be easily manufactured by injection molding, but are not limited thereto and may be manufactured through a press or the like.

Meanwhile, the transformer 100 according to the present invention has a structure in which the first secondary coil 25, the second secondary coil 35, and the third secondary coil 45 are sequentially stacked. As a result, high voltage and heat may be applied to the outer bobbins 30 and 40 interposed between the coils 25, 35 and 45. Therefore, the outer bobbins 30 and 40 according to the present invention are preferably made of an insulating resin, and preferably made of a material having high heat resistance and high voltage resistance. The materials forming the outer bobbins 30 and 40 include polyphenylene sulfide (PPS), liquid crystalline polyester (LCP), polybutylene terephthalate (PBT), polyethylene terephthalate (PET), and phenolic resins. Can be used.

In the case of forming the outer bobbins 30 and 40 according to the present invention based on the above materials, the stacked first secondary coil 25, the second secondary coil 35, and the third secondary coil 45 may be mutually provided. Insulation is secured and the outer bobbins 30 and 40 can be prevented from being damaged by the heat generated by the high voltage applied to each of the coils 25, 35, and 45, thereby securing the reliability of the transformer 100. can do.

In addition, the transformer 100 according to the present embodiment is characterized in that the outer bobbins 30 and 40 are both received and fixedly coupled to the secondary winding accommodating portion 22 formed in the secondary bobbin 20. For this reason, the outer bobbins 30 and 40 according to the present embodiment share and use the partition wall 95 formed on the secondary bobbin 20, and thus do not include the partition wall 95 by themselves. This has the advantage that the structure of the outer bobbin (30, 40) is formed very simply and easy to manufacture.

The transformer 100 according to the present invention may further include an input terminal 60 and an output terminal 70 provided in the inner bobbins 10 and 20. The input terminal 60 supplies AC power to the primary coil. The input terminal 60 is electrically connected to the coil pin (a) and the coil pin (a) connected to the end of the primary coil 15 (that is, the lead wire) and is electrically connected to the outside, that is, the printed circuit board. It may be provided with a contact pin (b) to contact. In addition, the output terminal 70 is electrically connected to an external device, that is, a lamp. The output terminal 70 supplies an output power that is set according to the turns ratio between the secondary coils 25, 35, 45 and the primary coil 15 to the lamp (not shown). The output terminal 70 is connected to the output pin (c) electrically connected to the ends of the secondary coils 25, 35, 45, and the output pin (c) and in electrical contact with the outside, for example, a printed circuit board. It may include an output contact pin (d).

In the present embodiment, the input terminal 60 and the output terminal 70 are disposed in opposite directions with the inner bobbins 10 and 20 interposed therebetween. In this case, the transformer 100 does not generate a return wire across the high voltage output side (that is, the secondary coil side), and thus may solve an insulation problem and a noise problem between the high voltage output side and the return wire.

In the transformer 100 according to the present embodiment configured as described above, both ends of each secondary coil 25, 35, and 45 are connected to two different output terminals 70. Since the transformer 100 according to the present embodiment includes three secondary coils 25, 35, and 45, a total of six output terminals 70 are provided. For example, one end of the first secondary coil 25 may be connected to the first output terminal 70a, and the other end of the first secondary coil 25 may be connected to the second output terminal 70b. Similarly, the third output terminal 70c connected to one end of the second secondary coil 35, the fourth output terminal 70d connected to the other end of the second secondary coil 35, and one end of the third secondary coil 45. And a fifth output terminal 70e connected to the sixth output terminal 70f connected to the other end of the third secondary coil 45.

As described above, since the transformer 100 according to the present embodiment includes six output terminals 70 per one, the transformer 100 may be usefully used in a display device using six lamps or three 'U' lamps. The volume can be reduced as compared to

In addition, since the transformer 100 according to the present embodiment uses a plurality of outer bobbins 30 and 40, the winding of the secondary coils may be easily performed.

6 is an exploded perspective view showing a transformer according to another embodiment of the present invention. The transformer 200 described in this embodiment has a structure similar to that of the transformer (100 in FIG. 1) of the above-described embodiment, and in the structure of the fitting protrusions 138 and 148 formed on the outer bobbins 130 and 140. Only have a difference. Therefore, a detailed description of the same components will be omitted, and will be described in more detail based on the structure of the fitting protrusions 138 and 148. In addition, for convenience of description, FIG. 6 shows only a part of the transformer similar to FIG. 4 described above, and the overall shape of the transformer according to the present embodiment is formed similarly to the transformer 100 shown in FIGS. 1 and 2. .

Referring to FIG. 6, in the transformer 200 according to the present embodiment, a plurality of fitting protrusions 138 and 148 are formed on inner surfaces of the first outer layer bobbin 130 and the second outer layer bobbin 140.

The fitting protrusion 39 according to the present exemplary embodiment is formed for all slits 129 and 139 instead of any one of the slits 129 and 139. Therefore, in the present embodiment, a plurality of fitting protrusions 138 and 148 protrude side by side along the longitudinal direction from the inner surfaces of the outer bobbins 130 and 140.

In addition, the fitting protrusions 138 and 148 according to the present embodiment are inserted into and inserted into the slits 129 and 139 on which the coils are wound. Thus, when the fitting protrusions 138 and 148 are inserted into the slits 129 and 139 too deeply, the fitting protrusions 138 and 148 may come into contact with coils wound on the slits 129 and 139 (see FIGS. 25 and 35 of FIG. 3). Therefore, in order to prevent contact between the coils and the fitting protrusions 138 and 148, the fitting protrusions 138 and 148 according to the present embodiment protrude to a very thin thickness t. When the protruding thickness is thin, a problem may occur in which the bonding force is reduced. Therefore, the fitting protrusions 138 and 148 according to the present embodiment form a plurality of fitting protrusions 138 and 148 for the entire slit 129 and 139, not any one of the slits 129 and 139, thereby improving the bonding force. Complement.

In addition, in order to increase the coupling force between the slits 129 and 139 and the fitting protrusions 138 and 148, the fitting protrusions 138 and 148 are formed to be slightly thicker than the widths of the slits 129 and 139, as in the above-described embodiment. The fitting protrusions 138 and 148 may be press-fitted to the 129 and 139.

In the case of the transformer 100 according to the above-described embodiment, the fitting protrusions 138 and 148 are fitted into the entire space of any one of the slits 129 and 139. Thus, while having a high coupling force, the at least one slit 129, 139 described above cannot be used to wind the coils 25, 35 of FIG. 3. However, in the transformer 100 according to the present embodiment, the fitting protrusions 138 and 148 may also be inserted into the slits 129 and 139 on which the coils 25 and 35 are wound, thereby effectively controlling the slits 129 and 139. It has the advantage of being available.

7 is a perspective view of a transformer according to another embodiment of the present invention.

Referring to FIG. 7, in the transformer 300 according to the present exemplary embodiment, the primary bobbin 210 and the secondary bobbin 220 are not formed of a single pipe, as in the above-described embodiments, and each is a separate configuration. Consists of elements.

That is, the transformer 300 according to the present exemplary embodiment includes a secondary bobbin 210 having a primary coil wound thereon, a secondary bobbin 220, a first outer bobbin 230, and a second outer bobbin 240. It includes a hollow portion (220, 230, 240), the primary bobbin 210 and the secondary bobbin (220, 230, 240) are disposed in parallel to each other.

Here, as in the above-described embodiments, the secondary bobbins 220, 230, and 240 have a structure in which the secondary bobbin 220, the first outer bobbin 230, and the second outer bobbin 240 are sequentially stacked. Formed, the difference is only in that the secondary bobbin 220 is configured to be separated from the primary bobbin 210.

The core 250 is inserted into the primary bobbin 210 and the secondary bobbin 220 so that the primary bobbin 210 and the secondary bobbin portions 220, 230, and 240 remain parallel to each other, and are connected in a 'ㅁ' shape. Form the path.

The transformer 300 according to the present embodiment has a difference only in that the primary bobbin 210 and the secondary bobbin parts 220, 230, and 240 are separated from each other and arranged in parallel, and the secondary bobbin parts 220 and 230 are disposed. The structure and form of the first outer layer bobbin 220 and the second outer layer bobbin 230 provided at the 240 are the same as those of the above-described embodiment.

On the other hand, although the transformer 300 shown in Figure 7 is not shown the input terminal and the output terminal, this is a configuration that can be easily derived as necessary, detailed description thereof will be omitted.

Since the transformer according to the present invention configured as described above can drive six lamps or three 'U' lamps using one, the number and volume of transformers employed in the display device can be minimized.

On the other hand, the transformer according to the present invention described above is not limited to the above-described embodiment, various applications are possible. For example, in the above-described embodiment, the case where the outer layer bobbin is formed of two sub bobbins has been described as an example. However, the present invention is not limited thereto, and may be formed to be more granular. That is, four sub bobbins may be formed, and if the outer bobbins can be configured through a combination of sub bobbins such that each sub bobbin is formed to be spaced apart by a predetermined distance, various methods may be used.

In the present embodiment, a transformer used for a display has been described as an example, but the present invention is not limited thereto, and any transformer that requires three outputs (or six outputs) may be widely applied.

100, 200, 300 ..... Transformers
10, 210 ..... Primary bobbin 12 ..... Primary winding receptacle
15 ..... primary coil
20, 220 ..... Second bobbin 22 ..... Secondary winding receptacle
25 ..... 1st secondary coil
30, 130, 230 ..... 1st outer bobbin 30a ..... 1st sub bobbin
30a .... 1st sub bobbin 35 ..... 2nd secondary coil
40, 140, 240 ..... 2nd outer bobbin 40a ..... 1st sub bobbin
40a .... 2nd sub bobbin 45 ..... 3rd secondary coil
50, 250 ..... core
60 ..... Input terminal
70 ..... Output terminal
95 ..... bulkhead
19, 29, 39, 49, 129, 139 ..... slit
38, 48, 138, 148 ..... fitting

Claims (15)

Tubular, primary bobbin in which a plurality of slits are formed on the outer circumferential surface;
A primary coil wound around an outer circumference of the primary bobbin;
Tubular, secondary bobbin in which a plurality of slits are formed on the outer circumferential surface;
A first secondary coil inserted and wound in the slit of the secondary bobbin;
A first outer layer bobbin surrounding an outer circumferential surface of the first secondary coil and fixed to the secondary bobbin and having a plurality of slits formed on the outer circumferential surface;
A second secondary coil wound around the slit of the first outer layer bobbin;
A second outer layer bobbin formed to surround an outer circumferential surface of the second secondary coil and fixed to the at least one slit formed on the first outer layer bobbin;
A third secondary coil wound around the second outer bobbin; And
A core inserted into the primary bobbin and the secondary bobbin to form a magnetic path;
Including;
The first outer layer bobbin, the transformer characterized in that the fitting to the at least one slit formed in the secondary bobbin. delete Tubular, primary bobbin in which a plurality of slits are formed on the outer circumferential surface;
A primary coil wound around an outer circumference of the primary bobbin;
Tubular, secondary bobbin in which a plurality of slits are formed on the outer circumferential surface;
A first secondary coil inserted and wound in the slit of the secondary bobbin;
A first outer layer bobbin surrounding an outer circumferential surface of the first secondary coil and fixed to the secondary bobbin and having a plurality of slits formed on the outer circumferential surface;
A second secondary coil wound around the slit of the first outer layer bobbin;
A second outer layer bobbin formed to surround an outer circumferential surface of the second secondary coil and fixed to the at least one slit formed on the first outer layer bobbin;
A third secondary coil wound around the second outer bobbin; And
A core inserted into the primary bobbin and the secondary bobbin to form a magnetic path;
Including;
The second outer layer bobbin,
And at least one fitting protrusion protruding along a winding direction from a center of an inner surface of the inner surface in contact with the second secondary coil, and fitted with the first outer layer bobbin through the fitting protrusion. Tubular, primary bobbin in which a plurality of slits are formed on the outer circumferential surface;
A primary coil wound around an outer circumference of the primary bobbin;
Tubular, secondary bobbin in which a plurality of slits are formed on the outer circumferential surface;
A first secondary coil inserted and wound in the slit of the secondary bobbin;
A first outer layer bobbin surrounding an outer circumferential surface of the first secondary coil and fixed to the secondary bobbin and having a plurality of slits formed on the outer circumferential surface;
A second secondary coil wound around the slit of the first outer layer bobbin;
A second outer layer bobbin formed to surround an outer circumferential surface of the second secondary coil and fixed to the at least one slit formed on the first outer layer bobbin;
A third secondary coil wound around the second outer bobbin; And
A core inserted into the primary bobbin and the secondary bobbin to form a magnetic path;
Including, the second outer layer bobbin,
A plurality of fitting protrusions formed on an inner surface of the second secondary coil and formed at positions corresponding to the slits of the first outer layer bobbin, and the fitting protrusions on the slit in which the second secondary coil is wound. Transformer is characterized in that the fitting. The said fitting protrusion of the said 1st outer layer bobbin,
The transformer of claim 1, wherein the transformer is press-fitted into at least one of the slits formed in the first outer layer bobbin. The method of claim 1,
The secondary bobbin is provided with a partition wall at both ends, the transformer is characterized in that the secondary winding receiving portion is formed by receiving the first secondary coil is wound by the partition wall. The method of claim 6, wherein the first outer layer bobbin and the second outer layer bobbin,
The transformer is received and fixed to the secondary winding receiving portion. Tubular, primary bobbin in which a plurality of slits are formed on the outer circumferential surface;
A primary coil wound around an outer circumference of the primary bobbin;
Tubular, secondary bobbin in which a plurality of slits are formed on the outer circumferential surface;
A first secondary coil inserted and wound in the slit of the secondary bobbin;
A first outer layer bobbin surrounding an outer circumferential surface of the first secondary coil and fixed to the secondary bobbin and having a plurality of slits formed on the outer circumferential surface;
A second secondary coil wound around the slit of the first outer layer bobbin;
A second outer layer bobbin formed to surround an outer circumferential surface of the second secondary coil and fixed to the at least one slit formed on the first outer layer bobbin;
A third secondary coil wound around the second outer bobbin; And
A core inserted into the primary bobbin and the secondary bobbin to form a magnetic path;
Including;
The first outer layer bobbin and the second outer layer bobbin,
And each transformer is divided into at least two sub bobbins. The method of claim 8, wherein the sub bobbins,
A transformer, characterized in that coupled to each other by an adhesive member. The method of claim 8, wherein the sub bobbins,
A transformer, characterized in that coupled to each other by welding. The method of claim 1, wherein the first outer layer bobbin and the second outer layer bobbin,
A transformer, characterized in that formed of an insulating resin. The method of claim 1, wherein the second outer layer bobbin,
A transformer, characterized in that a plurality of slits are formed on the outer peripheral surface. The method of claim 1,
And the primary bobbin and the secondary bobbin are arranged in a line along the longitudinal direction. The method of claim 13,
The primary bobbin and the secondary bobbin is made of a single tube, characterized in that arranged on both sides of the tube transformer. The method of claim 1,
And the primary bobbin and the secondary bobbin are disposed in parallel to each other.

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