KR101116461B1 - Transformer for inverter and diplay apparatus thereof - Google Patents

Abstract

The present invention relates to a transformer for inverters.

An inverter transformer according to an embodiment of the present invention includes a central bobbin including an output coil winding unit to which an output coil is wound, and a shielding unit extending to one side of the output coil winding unit to form a receiving space therein; An auxiliary bobbin positioned in an accommodation space formed in the shield of the central bobbin, the auxiliary bobbin including an input coil winding part to which the input coil is wound; And a core part including an inner core passing through a center of the central bobbin and the auxiliary bobbin.

Inverter, Transformer

Description

Inverter transformer and display device including the same

The present invention relates to a transformer for an inverter and a display device including the same.

In recent years, as the demand for a display device having a reduced thickness increases, a display device using a thin film display module such as a TFT-LCD using a thin film transistor (TFT) is used in many fields. It is becoming.

In the case of a display module such as the TFT-LCD, a light source such as a cold cathode fluorescent lamp is required, which is driven by an inverter circuit and is one of power consuming components in the display module.

In general, the inverter circuit receives a DC power from a power supply, generates a high voltage of AC, and includes a transformer for boosting or depressurizing the power.

It is an object of the present invention to propose a transformer for inverters in which the overall volume and manufacturing cost are reduced.

Still another object of the present invention is to propose a transformer for inverters in which short circuits between coils can be prevented as the separation distance between coils provided therein is more than a predetermined interval.

In order to achieve the above object, a transformer for an inverter according to an embodiment of the present invention includes an output coil winding unit on which an output coil is wound, and a shielding unit provided at one side of the output coil winding unit and opened outward. Central bobbin; An auxiliary bobbin in which an input coil is wound, the input coil winding being inserted into the shield; And a core part including an inner core passing through a center of the central bobbin and the auxiliary bobbin.

On the other hand, the display device according to the present embodiment, the image panel; A backlight unit provided at the rear of the image panel; And a transformer for supplying a voltage having a predetermined size to the backlight unit, wherein the transformer includes an output coil winding unit to which an output coil is wound, and a shielding unit provided at one side of the output coil winding unit and opened outwardly. Central bobbin comprising; An auxiliary bobbin in which an input coil is wound, the input coil winding being inserted into the shield; And a core part including an inner core passing through a center of the central bobbin and the auxiliary bobbin.

According to the proposed embodiment, the surface separation distance between the output coil and the input coil is secured by a shielding portion or more by a predetermined distance, so that a short circuit between the output coil and the input coil can be stably prevented.

In addition, as a pair of output coils and input coils are provided in one central bobbin, the voltage induction efficiency is increased and the volume and manufacturing cost of the transformer can be reduced.

Hereinafter, the spirit of the present invention will be described in detail through specific embodiments.

1 is a cross-sectional view of a display device according to the present embodiment.

Referring to FIG. 1, the display apparatus according to the present exemplary embodiment includes a display module 2 and a front cover (not shown) and a back cover (not shown) surrounding the front and the rear of the display module 2.

The display module 2 includes an image panel 3 on which an image is displayed, a backlight unit 7 provided behind the image panel 3 to provide light to the image panel 3, And a driving unit 8 for driving the backlight unit 7.

The image panel 3 may include, for example, a liquid crystal display panel (LCD panel) in which a liquid crystal is provided between a first substrate and a second substrate on which a thin film transistor (TFT) is mounted. Can be. In addition, the image panel 3 may further include a plurality of functional film layers such as, for example, an anti reflection film.

The backlight unit 7 includes a light source 71, a light guide plate 72, and a diffusion film unit 73.

In more detail, the light source 71 may be provided as, for example, a light emitting device such as a cold cathode fluorescent lamp (CCFL) or a light emitting diode (LED).

In addition, the light guide plate 72 allows the light emitted from the light source 71 to be irradiated to the image panel 3.

That is, the light source 71 is provided on the rear edge side of the image panel 3. Therefore, after the light is irradiated laterally toward the light guide plate 72 from the light source 71, the light is irradiated toward the image panel 3 side, that is, forward through the light guide plate 72.

In the present exemplary embodiment, the light path emitted from the light source 71 is changed to the front through the light guide plate 72, but the light source 71 is disposed directly behind the image panel 3. In addition, the configuration of irradiating the light directly to the front without a separate light guide plate 72 will also be included in the embodiment of the present invention.

In addition, the diffusion film unit 73 including a plurality of functional layers for uniformly diffusing the light emitted from the light guide plate 72 is provided between the light guide plate 72 and the image panel 3.

On the other hand, the driving unit 8 for driving the light source 71 of the backlight unit 7 is provided on the rear side of the backlight unit 7.

The driving unit 8 supplies the power having a predetermined voltage to the light source 71 to drive the light source 71 in more detail than the backlight unit 7.

In addition, the drive unit 8 may include an inverter for changing the power supply form, that is, an AC power supply or a DC power supply, and a voltage of the power supplied to the light source 71 to have a predetermined magnitude. It further includes an inverter transformer 1 (see Fig. 2) for boosting or depressurizing the voltage.

Hereinafter, the configuration of the transformer 1 according to the present embodiment will be described in more detail.

2 is a perspective view of an inverter transformer according to the present embodiment, and FIG. 3 is a view illustrating a state in which the first and second core parts are removed from FIG. 2. 4 is an exploded perspective view of the transformer of FIG. 2.

2 to 4, the transformer 1 includes a central bobbin 10 on which output coils 17 and 19 (see FIG. 5) are wound, and a central side of the central bobbin 10. The shielding cover 20, the first auxiliary bobbin 30 and the second auxiliary bobbin 40, which are provided at one side and the other side of the central bobbin 10, each of which the input coil is wound, and at least a portion of the central bobbin ( 10) and first and second core parts 50 and 60 passing through central portions of the first auxiliary bobbin 30 and the second auxiliary bobbin 40 to provide a path.

In more detail, the central bobbin 10 forms a central side frame of the transformer 1. In addition, first and second shields 15 and 16 (see FIG. 5) are formed at one side and the other side of the central bobbin 10, respectively, such that the first auxiliary bobbin 30 and the second auxiliary bobbin 40 are formed. A portion of) is inserted into the first and second shields 15 and 16.

That is, the pair of input coils to which power is supplied is wound around the first and second auxiliary bobbins 30 and 40 and provided at both ends of the transformer 1. In addition, a pair is provided to correspond to the pair of input coils, in which the output coils 17 and 19 which induce an induction current is generated by the current flowing through the input coil, are provided at the center side of the transformer 1. Is located.

In the process of operating the transformer 1, if an input current of a constant voltage is first applied to the input coil, when the input current passes through the input coil, the intensity and the direction are changed in response to the input current. The magnetic field caused by the magnetic flux is generated.

The change of the magnetic flux induces an output current in the output coil, and an output voltage with respect to an input voltage and a direction of the output current is determined according to the number and direction of windings of the output coil and the input coil.

As in this embodiment, for example, when the voltage of the output coil is higher than the input coil, the cross-sectional thickness of the input coil because the amount of current per hour flowing through the input coil is greater than the amount of current per hour flowing through the output coil May be greater than the cross-sectional thickness of the output coil.

Meanwhile, the output coils 17 and 19 are shielded from the input coil and the outside by the first and second shields 15 and 16 and the shielding cover 20, thereby outputting the output coils 17 and 19. Short circuit can be prevented.

Hereinafter, each component of the transformer 1 for preventing a short circuit between the output coils 17 and 19, the input coil and the outside will be described in detail.

5 and 6 are views showing the top and bottom of the central bobbin according to the present embodiment.

5 and 6, the central bobbin 10 includes a central bobbin body 11, a first shielding part 15, and a second shielding part provided at one side and the other side of the central bobbin body 11. (16).

The central bobbin body 11, the first shielding portion 15, and the second shielding portion 16 may be formed of, for example, an insulator such as an insulating resin, and may be integrally formed.

The central bobbin body 11 is formed in a symmetrical shape with respect to a central portion, and the central bobbin body 11 in a vertical direction in a radial direction with respect to the direction in which the central bobbin body 11 extends. A central partition wall 110 is formed to protrude along the edge of the).

In addition, the central bobbin body 11 has first and second output coil windings 12 and 13 which are symmetric about the central partition wall 110. In addition, one side and the other side of the central bobbin body 11 is connected to the first shielding portion 15 and the second shielding portion 16, the first shielding portion 15 and the second shielding portion 16 Neck portion 113 formed smaller than the cross-sectional area of the may be further formed.

The first and second output coil windings 12 and 13 have a plurality of partitions 12 for allowing a portion of the first and second output coils 17 and 19 wound a predetermined number of times to be spaced apart from each other by a predetermined distance. This is provided.

The partition wall 12 protrudes radially along a border of the central bobbin body 11 by a predetermined height, and the direction in which the partition wall 12 protrudes is inserted into at least a portion of the core parts 50 and 60. It is formed perpendicular to the direction to be.

In addition, first and second portions between the first output coil winding part 12 and the first shielding part 15 and between the second output coil winding part 13 and the second shielding part 16 are respectively. Ground side brackets 143 and 183 and first and second output end side brackets 144 and 184 are formed.

The first and second ground side brackets 143 and 183 and the first and second output end side brackets 144 and 184 protrude from opposite sides with respect to the central bobbin body 11.

In addition, first and second ground ends 141 and 181 which are grounded are provided at the end sides of the first and second ground side brackets 143 and 183, and first ends are provided at the end sides of the first and second output end brackets 144 and 184. And second output stages 142, 182.

At this time, the distance that the ground end 141 is spaced apart from the central bobbin body 11 is greater than the distance that the output end 142 is spaced apart from the central bobbin body 11.

The first output terminal 142 and the second output terminal 182 are spaced apart by a predetermined distance d4 in order to prevent a short circuit due to a potential difference therebetween. The separation distance d4 corresponds to the sum of the lengths of the first and second output coil windings 12 and 13. In the present embodiment, the separation distance d4 is, for example, 10 mm or more and 50 mm or less. It can be formed in size.

Similarly, the first ground terminal 141 and the second ground terminal 181 are also spaced apart from each other by the separation distance d4.

Meanwhile, the first and second output coils 17 and 19 are spaced apart from each other by a predetermined distance from the center of the central bobbin 10 to the first and second output coil windings 12 and 13. Winding.

In this case, the first and second output coils 17 and 19 wound on the central bobbin 10 are symmetrical with respect to the center partition wall 110.

That is, one side of the first output coil 17 and one side of the second output coil 19 that are closest to the central partition 110 are connected to corresponding first and second ground terminals 141 and 181, respectively. . Similarly, the other side of the first output coil 17 and the other side of the second output coil 19, which are most spaced apart from the central partition wall 110, are connected to the corresponding first and second output terminals 142 and 182, respectively.

In the process of driving the transformer 1, potentials of one side of the first output coil 17 and one side of the second output coil 19 which are adjacent to each other are formed to be equal to each other. This is to allow stable control of the transfocus 1 by performing an increase or decrease of the potential toward the other side of the output coil 17 or the other side of the second output coil 19.

For example, a potential of one side of the first output coil 17 and one side of the second output coil 19 is formed as a ground potential, and the other side of the first output coil 17 is a predetermined amount ( The potential of the second output coil 19 is formed to be a potential having a magnitude inverted to the negative potential of the first output coil 17.

That is, the output voltages of the first output coil 17 and the second output coil 19 are sequentially decreased or increased by sequentially increasing the potentials of the first output coil 17 and the second output coil 19. The control of generation can be performed smoothly and stably.

On the other hand, the first shielding portion 15 is formed extending in a direction parallel to the direction in which the inner core 52 (see Fig. 10) penetrates the central bobbin 10 and the first auxiliary bobbin 30. . And, it comprises a shield body 150 extending in an outward direction from one side of the central bobbin body (11).

The shielding body 150 has a shielding side partition wall 151 which is bent to be connected to the neck portion 113 of the central bobbin body 11, and is opened in an outer direction of the shielding body 150, At least a portion of the first auxiliary bobbin 30 is inserted into the insertion hole 152, and the auxiliary bobbin seating portion 153 is formed in a shape in which a portion further protrudes toward the outer direction from the shield body 150 More included.

Hereinafter, a configuration of a shielding cover for shielding the first and second output coil windings to the outside will be described in detail.

7 and 8 are views showing the top and bottom of the shield cover according to this embodiment.

7 and 8, the shielding cover 20 forms an outer shape of the shielding cover 20, and includes a cover body 21 positioned in the center of the shielding cover 20, and the cover body ( The first shielding wing portion 22 and the second shielding wing portion 23 provided on the right and left sides of the 21 is included.

In more detail, the cover body 21 includes a cover body upper surface 210 that shields upper side surfaces of the first and second coil windings 12 and 13 of the bobbin portion body 11, and the cover body upper surface ( A cover body side 212 which is bent to 210 and shields side surfaces of the first and second coil windings 12 and 13, and is formed on one side and the other side of the cover body 21, and the cover body The cover side partition wall 211 extended toward the inside of 21 is included.

In addition, the first and second coil windings 12 and 13 are accommodated inside the cover body 21 by the cover body upper surface 210 and the side surface 212 bent with respect to the upper surface 210. The body receiving space 213 is formed.

In addition, the cover body upper surface 210 may be further formed with an outlet hole 215 for flowing out the impregnation liquid for stably fixing the input and output coil to the outside in the state in which the manufacturing of the transformer 1 is completed. Can be.

On the other hand, the first shielding wing portion 22 of the wing body 220 and bent in the outward direction of the cover body 21 with respect to the cover body side surface 212, of the wing body 220 An extension part 221 further extending in one side and the other direction, and positioned between the extension part 221 and the wing body 220, and is formed in a direction perpendicular to the wing body 220. And an accommodation part side partition wall 222 integrally formed with the cover side partition wall 211.

In addition, a bracket accommodating part 223 for accommodating the first and second ground side brackets 143 and 183 may be partitioned by the accommodation part side partition wall 222 inside the first shielding wing part 22. have.

On the other hand, since the configuration of the second shielding wing 23 is symmetrical with the configuration of the first shielding wing 22 around the cover body 21, detailed description thereof will be omitted.

At this time, since the distance from which the first and second output end side brackets 183 and 184 protrude is smaller than the first and second ground end brackets 143 and 183, the first and second output end side brackets 183 and 184 The bracket receiving portion of the second shielding wing portion 23 to be accommodated is formed smaller than the bracket receiving portion of the first shielding wing portion 22.

In addition, the first and second core parts 50 and 60 are provided in the transformer 1, and the first and second shielding blade parts 22 and 23 are disposed on upper surfaces of the first and second core parts 50 and 60. Auxiliary cores of the second core parts 50 and 60 may be seated.

Hereinafter, the configuration of the first and second auxiliary bobbins 30 and 40 in which at least a part is inserted into the central bobbin 10 will be described in detail.

9 and 10 show a first auxiliary bobbin according to the present embodiment.

9 and 10, the first auxiliary bobbin 30 includes a bobbin body 31 to which the first input coil 36 is wound, and a terminal extending rearward from one side of the bobbin body 31. Bracket 32 and the first and second input end (351, 352) provided in the terminal bracket (32).

In detail, the first input coil 36 is wound around a central side edge of the bobbin body 31, and rear and front partition walls are respectively located at the rear and front of the bobbin body 31 based on the region in which the first input coil 36 is wound. 311,312 are formed. In addition, a core insertion hole 314 is formed in the central portion of the bobbin body 31 to integrally penetrate the rear and front partition walls 311 and 312.

The terminal bracket 32 is formed at a side of the rear partition 311 in a shape that is bent relative to the rear partition 311. In addition, the upper surface of the terminal bracket 32 is located adjacent to the core insertion hole 314, a core support boss 322 for supporting the inner core 54 (see Fig. 10) is formed, the terminal bracket Coil guide grooves 323 for guiding one side and the other side of the first input coil 36 to the first input end 351 and the second input end 352 may be formed on the bottom surface of the 32.

On the other hand, since the configuration of the second auxiliary bobbin 40 is the same as the configuration of the first auxiliary bobbin 30, a detailed description of the configuration of the second auxiliary bobbin 40 will be omitted.

11 is a view showing a core part according to the present embodiment.

Referring to FIG. 11, the first core part 50 includes a core part body 51, an inner core 52, and an outer core 52, 53.

The inner core 52 and the outer cores 52 and 53 extend in the same direction on one side of the core part body 51.

The inner core 52 is formed in a shape corresponding to the core insertion hole 314, and any one side of the inner core 52 and the outer core 52, 53 is recessed by a predetermined depth (t1). It is provided in the state.

The outer cores 52 and 53 are provided in pairs corresponding to each other, and the outer cores 52 and 53 are seated on the outer surfaces of the first and second shield wings 22 and 23, respectively. .

Meanwhile, the width w1 of the inner core 52 is larger than the width w2 of the outer cores 53 and 54. This is because the outer cores 53 and 54 are provided in pairs, and the inner cores 52 are provided as one, so that the sum of the widths of the paths of each of the outer cores 53 and 54 and the inner side are provided. This is to allow the width of the core 52 to correspond to each other.

Therefore, in the present embodiment, for example, the width w1 of the inner core 52 may be formed to be twice the width w2 of the outer cores 53 and 54.

Hereinafter, the configuration of the transformer 1 in a state where the components included in the transformer 1 are assembled will be described in detail.

FIG. 12 is a view along the A-A diagram of FIG. 3, and FIG. 13 is a view along the B-B diagram of FIG. 3.

12 and 13, in a state in which at least some of the first and second auxiliary bobbins 30 and 40 are inserted into the first and second shielding portions 15 and 16, respectively, the first and second auxiliary bobbins 30 and 40 are respectively inserted. The first input coil 36 and the second input coil (not shown) wound around the second auxiliary auxiliary valves 30 and 40 are located inside the first and second shields 15 and 16.

The first input coil 36 and the second input coil are provided to be spaced apart from the inner walls of the first and second shields 15 and 16 by a predetermined distance d3.

At this time, when the separation distance d3 is formed to a size less than 0.5 mm, the first input coil 36 or the second input through the inner wall of the first or second shield 15, 16 As the spark of relatively high voltage is delivered toward the coil, there is a problem that the transformer 1 may be damaged.

In addition, when the separation distance d3 is formed to have a size exceeding 5 mm, the first or second shielding portions 15 and 16 and the first and second input coils by the separation distance d3. Whereas the shielding ratio between the two converges to a certain size, the cross-sectional size of the first or second shields 15 and 16, that is, the volume of the transformer 1 increases inefficiently.

Therefore, in the present embodiment, the separation distance d3 between the first or second shield 15 and 16 and the first input coil 36 or the second input coil is, for example, 0.5 mm or more and 5 mm or less. It can be formed in size.

On the other hand, the cover side partition wall 211, which is bent on both sides of the shield cover 20 is inserted into the neck portion 113 to be fitted, thereby fixing the shield cover 20 to the central bobbin 10. You can.

In this case, one side of the first output coil 17 spaced apart from the central partition wall 110 in the first output coil 17 and the first shielding portion 15 in the first input coil 36. One side of the first input coil 36 which is located in the innermost space is spaced apart by a predetermined distance d2.

The shielding side partition wall 151 and the cover side partition wall 211 are provided between one side of the first output coil 17 and one side of the first input coil 36, and the first output coil 17 is provided. And shield the first input coil 36.

At this time, when the clearance d2 is less than 5 mm, the shielding side partition wall 151 and the cover side partition wall positioned between one side of the first output coil 17 and one side of the first input coil 36. The shielding efficiency of 211 is reduced.

On the contrary, when the space distance d2 exceeds 15 mm, as the distance itself between the first output coil 17 and the first input coil 36 increases, the first input coil 36 Induction efficiency of the first output coil 17 is reduced.

Therefore, the space distance d2 according to the present embodiment is formed to have a size of, for example, 5 mm or more and 15 mm or less.

In addition, a surface separation distance d1 of a predetermined distance is formed between one side of the first output coil 17 and one side of the first input coil 36.

The surface separation distance d1 is the first shielding from one side of the first output coil 17 to one side of the first input coil 36 via an outer surface and an inner surface of the shielding body 150. It is determined by the surface distance of the part 15 and at least a portion of the central bobbin body 11.

When the surface separation distance d1 is less than 20 mm, spark is generated on one side of the first output coil 17 having a relatively high pressure, so that the first shielding portion 15 and the central bobbin body 11 As the spark is transmitted to one side of the first input coil 36 via a surface, a short circuit may occur.

On the contrary, when the surface separation distance d1 exceeds 40 mm, as the size of the first shielding portion 15 or the central bobbin body 11 is increased, the transformer ( There is a problem that the volume of 1) is increased.

Therefore, the surface separation distance d1 according to the present embodiment is set to a size of 20 mm or more and 40 mm or less.

According to the proposed embodiment, the surface separation distance between the output coil and the input coil is secured by a shielding portion or more by a predetermined distance, so that a short circuit between the output coil and the input coil can be stably prevented.

In addition, as a pair of output coils and input coils are provided in one central bobbin, the voltage induction efficiency is increased and the volume and manufacturing cost of the transformer can be reduced.

1 is a cross-sectional view of a display device according to the present embodiment.

2 is a perspective view of an inverter transformer according to the present embodiment;

3 is a view illustrating a state in which the first and second core parts are removed from FIG. 1.

4 is an exploded perspective view of the transformer of FIG. 2.

5 and 6 are views showing the top and bottom of the central bobbin according to the present embodiment.

7 and 8 are views showing the top and bottom of the shielding cover according to this embodiment.

9 and 10 show a first auxiliary bobbin according to the present embodiment.

11 is a view showing a core part according to the present embodiment.

12 is a view according to the A-A diagram of FIG.

13 is a view according to the B-B diagram of FIG.

Claims (18)

A central bobbin including an output coil winding unit to which an output coil is wound, and a shielding unit extending to one side of the output coil winding unit to form a receiving space therein; An auxiliary bobbin positioned in an accommodation space formed in the shield of the central bobbin, the auxiliary bobbin including an input coil winding part to which the input coil is wound; And And a core part including an inner core penetrating the center of the central bobbin and the auxiliary bobbin. The method of claim 1, The output coil winding, the shield and the auxiliary bobbin is provided with a pair corresponding to each other transformer for inverter. The method of claim 2, And the pair of output coil windings and the shielding portion are symmetrically formed around a central partition wall formed at the center of the central bobbin. The method of claim 2, The output coil is A first output coil formed on the left side of the center bobbin center; A second output coil spaced apart from the first output coil by a predetermined distance and formed on a right side with respect to the center of the central bobbin, The first and second output coils are transformer transformer for the inverter becomes larger as the distance from the center of the bobbin. The method of claim 4, wherein One side of each of the first and second output coils adjacent to the center of the central bobbin is connected to a ground terminal. The method of claim 1, The output coil winding part is formed with a plurality of partition walls in a direction perpendicular to the direction in which the inner core is inserted, The output coil is a transformer for an inverter is wound in accordance with a predetermined number of windings in the space between the partition wall. The method of claim 1, The output coil winding unit and the shield unit forming the central bobbin are integrally formed with each other transformer for inverter delete The method of claim 1, The surface separation distance between the one side of the output coil and one side of the input coil is determined by the surface distance from one side of the output coil to the one side of the input coil via the outer surface and the inner surface of the shield body. The method of claim 9, Inverter transformer whose surface separation distance between the output coil and the input coil is 20mm or more and 40mm or less The method of claim 1, An inverter transformer having a separation distance between one side of the output coil and one side of the input coil is 5 mm or more and 15 mm or less. The method of claim 1, And a shielding cover surrounding the output coil winding part. The method of claim 1, And the input coil wound around the input coil winding part is spaced apart from the inner wall of the shield by at least a predetermined distance. The method of claim 13, The separation distance between the inner wall of the shield and the input coil is 0.5mm or more and 5mm or less. The method of claim 1, The central bobbin, a transformer for the inverter further formed between the shield and the output coil winding portion, the ground terminal connected to one side of the output coil and the output terminal connected to the other side of the output coil. The method of claim 15, The ground terminal and the output terminal are spaced apart from each other in the opposite direction with respect to the output coil winding, the distance that the ground terminal is spaced larger than the distance that the output terminal is spaced apart transformer. The method of claim 1, And the shielding portion is formed to extend in a direction parallel to a direction in which the inner core penetrates. Imaging panel; A backlight unit provided at the rear of the image panel; And A transformer for supplying power having a voltage of a predetermined magnitude is included in the backlight unit, In the transformer, A central bobbin including an output coil winding unit to which an output coil is wound, and a shielding unit extending to one side of the output coil winding unit to form a receiving space; An auxiliary bobbin positioned in an accommodation space of the shield forming the central bobbin and including an input coil winding unit in which an input coil is wound; And And a core part including an inner core penetrating the center of the central bobbin and the auxiliary bobbin.

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