KR20050027659A - A transformer for lcd-backlight - Google Patents

Abstract

A transformer for an LCD(Liquid Crystal Display) backlight is provided to increase coupling force of components and make assembly and separation of the components easy by changing coupling structure of the components and to insulate primary and secondary bobbins from each other. A primary coil is wound around a primary bobbin(200). A secondary coil is wound around a secondary bobbin(100). A division partition(310) is put at the center of a trans cap(300) and the first and second seating grooves(300b,300a) are formed at the trans cap so that the first and second bobbins are dividedly seated in the trans cap. A pair of cores(400) with a certain shape pass through both side parts of the trans cap and are inserted into insertion holes(200a,100a), respectively. The insertion holes are formed in the primary and secondary bobbins, respectively.

Description

LCD backlight {A TRANSFORMER FOR LCD-BACKLIGHT}

The present invention relates to a transformer for an LCD backlight, and more particularly, by changing the coupling structure of the component parts to further strengthen the fastening force of these components, as well as to facilitate assembly and disassembly, primary bobbin and secondary The present invention relates to a transformer for LCD backlights that enables electrical insulation of bobbins.

With the development of display technology, monitors, which are liquid crystal displays (LCDs), are increasingly used in computer or other display devices.

Compared to a CRT monitor, the liquid crystal display device has an advantage of a display device quality in which a longitudinal section is slimmed and flicker is reduced.

The LCD monitor has a fluorescent tube driven at a high pressure for a backlight system where a back-light module is required.

On the other hand, an inverter with a drive circuit is used to drive the fluorescent tube, which has a high voltage transformer.

Therefore, in order to minimize the volume of the LCD monitor, the transformer used in the inverter circuit needs to have a thin plate type structure.

As a conventional technology of the transformer used for the LCD backlight, there is a transformer for an inverter circuit disclosed in Korean Patent Publication No. 2003 15957 published on February 26, 2003.

As shown in FIG. 1, the transformer 1 comprises a first bobbin 2 for the winding of the primary coil 22, a second bobbin 3 for the winding of the secondary coil 32, and a core. Has a module (4).

The first bobbin 2 and the second bobbin 3 are arranged side by side, each having a first hollow portion 21 and a second hollow portion 31.

In order to prevent arc defects of the secondary coil, the winding window of the secondary bobbin 2 is divided into young winding regions by a plurality of flanges. The core module 3 also has a first U-shaped core 4a and a second U-shaped core 4b, which are arranged from the opposite ends of the first bobbin 2 and the second bobbin 3. 21) and the second hollow part 31 to form an O-shaped closed magnetic loop.

Here, reference numerals 5 and 6 are pins connected to the primary and secondary coils.

However, the prior art configured as described above has the following problems.

First, as shown in FIGS. 1B and 1C, the core module 3 is disposed on the lower surface of the primary bobbin 2 and the secondary bobbin 3, and the primary and secondary bobbins 2 and 3 are disposed. ) And the core module 3 are in contact with each other without a separate fixing means, so there is a problem that their fastening force is weak and separated by external impulse.

Second, since the first and second bobbins 2 and 3 are adjacent to each other, there is a problem in that electrical insulation is not well achieved.

The present invention was devised to solve the above problems, and by changing the coupling structure of the component parts to further strengthen the fastening force of these components, as well as to facilitate the assembly and disassembly, primary bobbin and secondary The aim is to provide a transformer for LCD backlights that enables electrical isolation of bobbins.

LCD backlight transformer according to the present invention for achieving the above object, the primary bobbin winding the primary coil; A secondary bobbin in which the secondary coil is wound; A transcap having first and second bobbin settling grooves centered on partition partitions so that the primary and secondary bobbins are respectively partitioned; Penetrating both sides of the transcap characterized in that it comprises a pair of cores of the "C" shape is inserted into the insertion hole formed in the primary and secondary bobbin, respectively.

Hereinafter, a preferred embodiment of the LCD backlight transformer according to the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is an exploded perspective view of the LCD backlight transformer according to the present invention, Figure 3 is a perspective view of the LCD backlight transformer according to the present invention, Figure 4 is a cross-sectional view of the hook.

As shown, the transformer according to the present invention, the secondary bobbin 100 is wound around the secondary coil (not shown), the primary bobbin 200 is wound around the primary coil (not shown), and the 1, A transcap 300 having a first and second bobbin settling grooves 300a and 300b centered on a partition partition 310 so that the secondary bobbins 200 and 100 are respectively settled, and the transcap 300 And a pair of cores 400 having a "c" shape, which are inserted into the insertion holes 200a and 100a formed in the primary and secondary bobbins 200 and 100, respectively, through both side portions of the core. .

Here, it is preferable to use a Ni-Zn system as the material of the core 400.

In addition, since the 1st and 2nd coils are conventional techniques, illustration is omitted.

In addition, the partition partition 310 may be spaced apart between the secondary bobbin 100 and the secondary bobbin 100 so that the insulation is more securely performed.

The primary and secondary bobbins 200 and 100 are formed with core insertion grooves 200a and 100a into which the core 400 is inserted, respectively, and the primary and secondary coils (not shown). Electrically connected connecting terminals 203 and 103 are formed to protrude.

Core through holes 301 are formed at both sides of the trans cap 300 so that the core 400 is inserted therethrough, and a core for guiding insertion of the core 400 at the lower side of the core through holes 301. A guide 302 is formed, and the core separation prevention band 303 is coupled to and separated from the hooks 304 and 305 so that the core 400 inserted into the core through hole 301 is not separated. Removably coupled to both sides of the cap 300 is installed.

Here, the hook 304 is formed in the core separation prevention band 303, another hook 305 is formed on both sides of the transcap 300.

Here, the core departure prevention band 303 is made of a material having an elastic force to be coupled and detachable.

A protrusion 330 is formed in the first bobbin seating groove 300b of the transcap 300 to determine an insertion direction of the primary bobbin 200, and the protrusion is formed on an outer surface of the primary bobbin 200. An insertion groove 201 into which the 330 is inserted is formed.

In addition, a protrusion 320 is formed in the second bobbin seating groove 300a of the transcap 300 to determine an insertion direction of the secondary bobbin 100, and is formed on an outer surface of the secondary bobbin 100. An insertion groove 101 into which the protrusion 320 is inserted is formed.

By forming the protrusions 320 and 330 and the insertion grooves 101 and 201 as described above, the primary bobbin 200 and the secondary bobbin 100 are provided with the first and second bobbin seating grooves 300b and 300a. ), It is possible to prevent incorrect insertion.

Connection terminals 103 formed on both sides of the secondary bobbin 100 to be electrically connected to the primary and secondary coils are blocked from the outside by a filler such as epoxy resin, and the formulation 2 bobbin settling groove 300a. The dam member 340 of a predetermined height protrudes from the upper surface of the) so that the epoxy resin does not overflow to the outside of the trans cap 300.

The dam member 340 may further perform a function of protecting the internal pressure of the secondary coil.

Referring to the assembly sequence of the present invention configured as described above are as follows.

First, the primary bobbin 200 and the secondary bobbin 100 are placed in the first and second bobbin settling grooves 300b and 300a of the transcap 300.

Here, the primary bobbin 200 and the secondary bobbin 100 are taken into consideration.

That is, when the protrusions 320 and 330 are inserted into the insertion grooves 101 and 201, the directional inserts are not misinserted while being naturally oriented.

Thereafter, the core 400 is inserted through the core through hole 302 formed in the transcap 300, and then the core insertion grooves 200a and 100a formed in the primary bobbin 200 and the secondary bobbin 100. To be inserted into the

Next, the core departure prevention band 303 is inserted to prevent the core 400 from being separated.

Here, the hook 304 formed in the band 303 is detachably coupled to the hook 305 formed on the side of the transcap 300.

Finally, connecting terminals 203 and 103 formed on both sides of the primary and secondary bobbins 200 and 100 so as to be electrically connected to the primary and secondary coils using a filler such as epoxy resin. Only be exposed to the outside in a state of being exposed.

Here, the filler is not to overflow to the outside by the dam member 350.

As described above, according to the present invention, by changing the coupling structure of the component parts, it is possible to further strengthen the fastening force of these components, and to facilitate the assembly and disassembly, and to electrically insulate the primary bobbin and the secondary bobbin. This becomes possible.

As described above, according to the LCD backlight transformer of the present invention, by changing the coupling structure of the component parts to further strengthen the fastening force of these components, as well as to facilitate the assembly and disassembly, primary bobbin and secondary Electrical insulation of the bobbin is possible.

Figure 1a is an exploded perspective view showing a transformer according to the prior art.

1B is a cross-sectional view of the primary coil of FIG. 1A;

1C is a cross-sectional view of the secondary coil of FIG. 1A.

Figure 2 is an exploded perspective view showing a transformer for an LCD backlight according to the present invention.

Figure 3 is a perspective view of the LCD backlight transformer combined according to the present invention.

4 is a cross-sectional view of the hook.

<Description of the symbols for the main parts of the drawings>

100: secondary bobbin

200: primary bobbin

300: transcap

310: partition

400: core

Claims (6)

A primary bobbin 200 in which the primary coil is wound; A secondary bobbin 100 in which a secondary coil is wound; A transcap 300 having first and second bobbin settling grooves 300b and 300a centered on partition partitions 310 so that the first and second bobbins 200 and 100 are respectively settled; A pair of cores 400 having a "c" shape, respectively, inserted into the insertion holes 200a and 100a formed in the primary and secondary bobbins 200 and 100 by penetrating both sides of the transcap 300. Transistor for the LCD backlight comprising a). According to claim 1, Core through-holes 301 are formed in both sides of the transcap 300 so that the core 400 is inserted through, A core guide 302 is formed below the core through hole 301 to guide the insertion of the core 400. In order to prevent the core 400 inserted into the core through hole 301 from being separated, the core separation prevention bands 303 may be connected to both sides of the transcap 300 through hooks 304 and 305 which are coupled to or separated from each other. LCD backlight transformer, characterized in that the removable installation. The first bobbin seating groove 300b of the transcap 300 is provided with a protrusion 330 to determine an insertion direction of the primary bobbin 200 and the primary bobbin 200. Transistor for the LCD backlight, characterized in that the insertion groove 201 is formed in the outer surface of the protrusion 330 is inserted. According to claim 1, The second bobbin seating groove (300a) of the transcap 300 is formed with a projection 320 to determine the insertion direction of the secondary bobbin 100, the secondary bobbin 100 Transistor for LCD backlight, characterized in that the insertion groove 101 is formed on the outer surface of the protrusion 320 is inserted. The method of claim 1, wherein the connecting terminal 103 formed on both sides of the secondary bobbin 100 to be electrically connected to the secondary coil is cut off from the outside by a filler material, the second bobbin settling groove (300a) The upper surface of the transformer for the LCD backlight, characterized in that the dam member 340 of a predetermined height protrudes so that the filler does not overflow to the outside of the trans cap 300. The LCD backlight transformer of claim 1, wherein the core (400) is made of Ni-Zn.