KR200415978Y1 - Balance transformer - Google Patents

Abstract

The present invention relates to a balance transformer, comprising a longitudinal center aperture extending through two ends, a plurality of flanges extending around the periphery between each two adjacent windings on each bobbin element, a plurality of electrically insulated terminal holder plates And a bobbin made up of a plurality of electrically insulated bobbin elements respectively installed on the electrically insulated terminal holder plates and each of which has a plurality of metal terminals electrically connected to windings of respective bobbin elements, respectively.

It consists of two ferrite core members having at least one arm which abuts against each other and is fastened to the bobbin elements of the bobbin from two opposing surfaces and each inserted into a longitudinal center aperture of the bobbin element of the bobbin.

Bobbin, ferrite core member, winding

Description

Balance transformer {BALANCE TRANSFORMER}

1 is a perspective view of a balance transformer conventional balance transformer according to a first embodiment of the present invention

2 is an exploded view of a balance transformer according to a first embodiment of the present invention

3 is a bottom perspective view of a balance transformer according to a first embodiment of the present invention

4 is a circuit diagram of an application example of a balance transformer according to a first embodiment of the present invention;

5 is a circuit diagram of another application example of the balance transformer according to the first embodiment of the present invention;

6 is a circuit diagram of another application example of the balance transformer according to the first embodiment of the present invention;

7A is an exploded view of a balance transformer according to a second embodiment of the present invention

7B is an exploded view of a balance transformer according to a third embodiment of the present invention

8A is an exploded view of a balance transformer according to a fourth embodiment of the present invention

8B is an exploded view of a balance transformer according to a fifth embodiment of the present invention

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

1: balance transformer 2: lamp tube

11: bobbin 12: ferrite core member

13: cap 110: longitudinal center through hole

111: bobbin element 112: winding

113: groove flange 114: electrical insulated terminal holder plate

115: metal terminal 116: dobertail joint

121: side arm 122: center arm

131: engagement rib 1121: low voltage winding

1122: high voltage winding

The present invention relates to a transformer, and more particularly, a balance that is used in an LCD backlight in order to save the manufacturing cost of the LCD backlight and a circuit space in the LCD backlight, and the LCD backlight meets the requirements of light, thin, short and small characteristics. It is about a transformer.

The first controllable CRT was developed in 1897. However, it was first used in television sets in the 1940s. Today, several new devices have been developed, including TFT LCDs, PDPs, FDPs, etc., and have appeared on the market. TFT LCDs are expected to completely replace CRTs in the market. Currently, the backlight of TFT LCDs uses a number of Cold Cathode Fluorescent Lamps (CCFLs).

Moreover, with the development of big size LCD backlights, the design of single tube backlights does not meet the requirements. Today, the backlight of big size LCD monitors / TVs uses multiple lamp tubes to provide the desired brightness. However, because different lamp tubes have different impedances, using a power converter or one single transformer to drive multiple lamp tubes connected in parallel does not uniformly control the distribution of current. As a result, the lamp tubes have different brightnesses, thereby lowering the real quality of the LCD monitor / TV or shortening the service life of the system. To overcome this problem, a balance transformer is installed at the low or high voltage stage at the input end of the high voltage transformer or at the operating loop of the inverter to control the distribution of current to the impedance difference between the lamp tubes, thus maintaining the same brightness of the lamp tube. do. However, one balance transformer can be connected to one or two lamp tubes, so multiple balance transformers must be used when driving many lamp tubes. However, the use of multiple balanced transformers in the backlight adds cost and limits the use of circuit board space.

Therefore, it is to provide a balance transformer that reduces the cost and increases the use of the circuit board space to overcome the above problems.

According to one embodiment of the present invention, the balance transformer is composed of a bobbin and two ferrite core members. The bonib is formed of a plurality of bobbin elements each mounted by winding. Each bobbin element includes a longitudinal center aperture extending through two ends, a plurality of flanges extending around the periphery between each two adjacent windings on each bobbin element, a plurality of electrically insulated terminal holder plates, and the electrical Each of the insulated terminal holder plates has a plurality of metal terminals, each of which is electrically connected to a winding of each bobbin element. The two ferrite core members abut against each other and are fastened to the bobbin elements of the bobbin from two opposing surfaces, each having at least one arm inserted into a longitudinal center aperture of the bobbin element of the bobbin.

Moreover, the flange of each bobbin element and the electrically insulated terminal holder plate keep the external object away from the windings, preventing circuit shorts.

In addition, the electrically insulating cap increases the holding strength of the balance transformer against high voltages and is respectively covered on the bobbin element over the windings.

Moreover, the bobbin elements can be arranged in one line or several lines. Alternatively, the bobbin elements can be connected in parallel.

1 and 2, the balance transformer 1 according to the first embodiment of the present invention includes a bobbin 11, two ferrite core members 12, and a plurality of electrically insulating caps 13.

The bobbin 11 is formed of a plurality of bobbin elements 111 connected by one line. Furthermore, each bobbin element 111 has a longitudinal center aperture 110 extending axially through two ends, a plurality of groove flanges 113 spaced along the length of the bobbin and arranged around the periphery, An electrically insulated terminal holder plate 114 electrically connected to the plurality of windings 112, the plurality of electrically insulated terminal holder plates 114, and the windings 112 respectively wound around the periphery between the two groove flanges 113. Each of which has a plurality of metal terminals 115.

The two ferrite core members 12 each have two parallel side arms 121 and center arms 122 spaced in parallel between the side arms 121.

Electrically insulating caps 13 are covered on bobbins 11 each having at least one engagement rib 131 to engage the groove flanges 113 of the bobbin 11.

Moreover, the winding 112 includes a low voltage winding 1121 and a high voltage winding 1122, wherein the bobbin 11 and the cap 13 are each made of an electrically insulating material; The core members 12 each consist of a ferrite core.

Referring to FIGS. 3 and 1 and 2 again, the bobbin elements 111 are connected in a straight line to form the bobbin 11. The center arms 122 of the two ferrite core members 12 are respectively inserted into the longitudinal center through holes 110 of the bobbin 11 from the two ends of the bobbin 11, so that the center arms of one ferrite core member ( 122, the two side arms 121 of the other ferrite core member at the bobbin 11 abut against the side arms 121 of the other ferrite core member at the two sides out of the bobbin 11, respectively. The insulating cap 13 is respectively covered on the windings 112 near the two ends of the bobbin 11 such that the engagement rib 131 is engaged with the groove flange 113 of the bobbin 11.

In assembly, the groove flange 113 and the electrically insulated terminal holder plate 114 act as spacer means to prevent low voltage windings from ashing. Furthermore, the electrically insulating cap 13 improves the holding strength of the balance transformer against high voltage after installation of the balance transformer 1 at the high voltage stage of many lamp tubes, and increases the authenticity of the balance transformer 1.

4 to 6, after installation of the balance transformer 1 at the high voltage stage of many lamp tubes 2, the characteristic of the high inductive resistance of the balance transformer 1 reduces the effect of the impedance difference between the lamp tubes. And effectively control the distribution of the current through the lamp tube 2 to maintain the lamp tube at the same brightness. The use of the balance transformer 1 in the LCD backlight greatly reduces the manufacturing cost in the LCD backlight and also saves the circuit space in the LCD backlight, so that the LCD backlight meets the requirements of light, thin, short and small characteristics. Moreover, the balance transformer 1 may be installed at the input terminal of the high voltage transformer or at the low voltage terminal of many lamp tubes.

Referring to FIG. 7A, a balance transformer according to a second embodiment of the present invention is shown. According to this embodiment, the bobbin 11 is formed of two bobbin elements 111 connected in parallel by a coupling structure, for example a dovetail joint 116; The ferrite core member 12 removes the center arm 122 described above; The side arms 121 of the ferrite core arm member 12 are respectively inserted into the longitudinal center through holes 110 of the bobbin element 111 from both sides so that the side arms 121 of the ferrite core member are different from the bobbin 11. The side arms 121 of the ferrite core member abut against each other.

Referring to FIG. 7B, an exploded view of a balance transformer according to a third embodiment of the present invention. This embodiment is substantially similar to the second embodiment described above except for the bobbin 11 formed of the bobbin elements 111 arranged in two lines connected in parallel.

8A, an exploded view of a balance transformer according to a fourth embodiment of the present invention. In this embodiment, each of the ferrite core members 12 has two side arms 121 disposed on both sides of the outside of the bobbin 11, and the two center arms 122 are arranged in the longitudinal apertures of the bobbin element 111. It is substantially similar to the above-described third embodiment except that each is inserted into 110).

8B, an exploded view of a balance transformer according to a fourth embodiment of the present invention. The ferrite core member 12 of this fourth embodiment is the same as the ferrite core member of the fourth embodiment described above, and the bobbin 11 of the fifth embodiment is the same as the bobbin of the third embodiment described above.

A typical example of a balance transformer is made with Figs. The balance transformer has all the features described above and functions well.

What has been described above is only one embodiment for implementing the balance transformer according to the present invention, the present invention is not limited to the above embodiment, as claimed in the following utility model registration claims of the present invention Without departing from the gist, any person having ordinary knowledge in the field to which the present invention belongs will have a technical spirit of the present invention to the extent that various modifications can be made.

Claims (4)

A longitudinal center aperture extending through two ends, a plurality of flanges extending around the periphery between each two adjacent windings on each bobbin element, a plurality of electrically insulated terminal holder plates, and the electrically insulated terminal holder plates A bobbin composed of a plurality of electrically insulated bobbin elements respectively installed and each having a plurality of metal terminals electrically connected to windings of respective bobbin elements, and each mounted by windings, and Two ferrite core members having at least one arm which abuts against each other and is fastened to the bobbin elements of the bobbin from two opposing surfaces, each of which is inserted into a longitudinal center aperture of the bobbin element of the bobbin. Balance transformer, characterized in that consisting of. The balance transformer according to claim 1, wherein the bobbin elements of the bobbin are longitudinally connected by one line. The balance transformer according to claim 1, wherein the bobbin elements of the bobbin are connected in parallel. 2. The balance transformer of claim 1, further comprising a plurality of electrically insulating caps respectively covered on the bobbin element above the windings.

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