KR100911944B1 - Slim type great capacity transformer for Inverter - Google Patents

Abstract

The present invention relates to a thin high-capacity transformer used in an inverter, and more particularly, to increase efficiency by doubling power processing power than a conventional small-capacity transformer, and to increase space utilization inside the inverter. In addition, the present invention relates to a thin high-capacity transformer for inverters that can shorten the assembly process and assembly time according to fabrication and exhibit stable performance.

Accordingly, a thin high-capacity transformer module for inverters of the present invention includes: a bobbin having a hollow portion formed in the center thereof, and having a low pressure side connection terminal and a high pressure side connection terminal for forming an electrical connection path at both ends; A low pressure coil and a high pressure coil wound around the outer circumferential surface of the bobbin at predetermined intervals so as to be connected to the low pressure side connection terminal and the high pressure side connection terminal, respectively; A plurality of i-cores inserted in parallel in the hollow portion of the bobbin; The low pressure and high pressure coil is wound around the upper portion of the bobbin wound, and both ends are made of a plurality of cap cores in contact with the eye core, the bobbin is a predetermined interval between the plurality of eye cores inserted into the hollow portion At least one partition wall for spaced apart is characterized in that formed.

Description

Slim type great capacity transformer for Inverter

The present invention relates to a thin high-capacity transformer used in an inverter, and more particularly, to increase efficiency by doubling power processing power than a conventional small-capacity transformer, and to increase space utilization inside the inverter. In addition, the present invention relates to a thin high-capacity transformer for inverters that can shorten the assembly process and assembly time according to fabrication and exhibit stable performance.

Recently, with the development of display devices, LCD monitors and LCD TVs are widely used. Most displays, such as LCDs, are light-receiving devices that display images by controlling the amount of light coming from the outside, and thus require a separate light source for illuminating light, that is, a compact and high power efficiency backlight unit (BLU). In addition, the inverter used in the backlight unit provides a stable driving voltage of a frequency set in the backlight assembly for providing backlight to the LCD liquid crystal cell by the transformer.

In this case, the inverter is a power converter that changes the direct current into alternating current (AC), and the LCD inverter refers to a small capacity inverter that receives a low voltage DC voltage from a battery or an adapter of a notebook and converts it into an AC voltage required for driving a lamp. Inverter for LCD is one of the components constituting the backlight for LCD, and it is a core technology necessary for driving the backlight.

Transformers are also devices that increase or decrease the voltage of alternating current. They are usually manufactured by winding several wire coils around a large magnet core. When the coil is connected to the input circuit to change the voltage and the output circuit to which the changed (converted) voltage is used, and the alternating current of the input circuit passes through the low pressure coil, the strength and direction change in response to the alternating current. Magnetic field is generated. The change in magnetic flux induces an alternating voltage in the high pressure coil and the winding ratio in each coil determines the transformer ratio.

Looking at the conventional transformer used in the inverter with reference to Figure 1 as follows.

As shown in the drawing, the conventional transformer module 1 forms a low voltage terminal board 12a and a high voltage terminal board 12b having a low voltage terminal 11a and a high voltage terminal 11b on both sides, and the terminal substrate 12a. , The bobbin body portion having a hollow portion 13 formed therebetween so as to be able to insert the "E" type core 20 having the same width as the transverse length of the terminal boards 12a and 12b therebetween and integrally between the two sides. The coil partition 16 and the high pressure coil winding 15 which divide the outer peripheral surface of the bobbin body 18 and the low pressure coil winding 14 and the high pressure coil winding 15 are divided at regular intervals. A bobbin 10 composed of a plurality of slits 17 and a heavy core 21 inserted into the study 13 of the bobbin 10 and an outer core 22 integral with the heavy core 21. It consists of a combination of "E" type core 20 is formed.

In addition, as another form, the transformer is mounted in such a manner that a straight "I" core inserted into the hollow portion 13 and a "U" core are inserted and gripped on the upper portion of the bobbin into which the "I" core is inserted. Can be configured.

As such, the transformer 1 composed of the combination of the bobbin 10 and the core 20 is mounted to an inverter and used to convert voltage, current, or change impedance. 2 is a schematic circuit diagram showing a state of use of an inverter transformer according to the prior art. Referring to FIG. 2, a high AC voltage is obtained by supplying a low AC voltage to the low pressure coil 19a. The lamp 32 on the backlight unit 4 is guided on the 19b and is powered by the high pressure coil 19b. In this case, the transformer 1 used has a characteristic of high voltage because one transformer supplies power to the plurality of lamps 32.

On the other hand, such a transformer needs to minimize the size to have a thin plate-type structure in order to be mounted in the inverter having a drive circuit. The structure of a transformer having such a thin plate type structure is well shown in Korean Patent Application No. 10-2005-0069601 filed by the present applicant. In this case, in order to form a thinner terminal board, the coil terminals inserted into both terminal boards are positioned so that they are not located in the same line up and down with the drawing path formed at the lower part of the terminal board, and the depth of the drawing path is formed deeper. The transformer can be made as thin as possible by bending the soldering terminal of the high voltage side coil terminal and the low pressure side coil terminal at a predetermined angle in the lateral direction to be positioned in front of the leading end of the drawing path so that the coil does not fall out or disconnect in other processes. Due to the brazed soldering terminal part, the coil wound around can not be pulled out and the coil winding can be performed in series, and the high pressure coil can be prevented from being disconnected due to the heating temperature due to the soldering.

However, the conventional transformer as described above has a thin thickness, but has a limited capacity in terms of power processing capacity because of its relatively small capacity. In other words, in order to smoothly supply power to a large number of lamps mounted on a large LCD, a large number of small-capacity transformers are required to increase power supply processing capacity. Thus, mounting a large number of small-capacity transformers becomes complicated. In addition to the large amount of work time and the inefficient use of space inside the inverter, it was necessary to develop a thin large-capacity transformer having a thin type and a large power processing capability.

The present invention is to solve the above problems, an object of the present invention is to increase the size of the bobbin so that a plurality of eye cores can be inserted in parallel in the hollow portion, the eye core on the top of the bobbin inserted eye core To install a plurality of cap cores corresponding to the at least one partition wall spaced at a predetermined interval between the plurality of eye cores inserted into the hollow portion to form a thin-type large-capacity transformer, compared to the conventional small-capacity transformer It is possible to increase efficiency by doubling the power processing power, increase the space utilization inside the inverter, reduce the assembly process and assembly time according to the manufacturing, and at the same time, exhibit the stable performance. To provide a large capacity transformer.

In order to achieve the above object, a thin-film high-capacity transformer for inverters according to the present invention includes a bobbin having a hollow portion formed in a center thereof, and a low pressure side connecting terminal and a high pressure side connecting terminal for forming an electrical connection path at both ends; A low pressure coil and a high pressure coil wound around the outer circumferential surface of the bobbin at predetermined intervals so as to be connected to the low pressure side connection terminal and the high pressure side connection terminal, respectively; A plurality of i-cores inserted in parallel in the hollow portion of the bobbin; The low pressure and high pressure coil is wound around the upper portion of the bobbin wound, and both ends are made of a plurality of cap cores in contact with the eye core, the bobbin is a predetermined interval between the plurality of eye cores inserted into the hollow portion At least one partition wall for spaced apart is characterized in that formed.

In addition, the present invention may be further formed with at least one or more space maintaining pieces for separating the plurality of cap cores at regular intervals.

At this time, it is preferable that the gap retaining piece is integrally formed on an upper portion of the partition wall.

In addition, the present invention may be further provided with an insulating sheet interposed between the low and high voltage coil and the cap core to electrically insulate between them.

Both ends of the cap core are fixed through the epoxy in contact with the upper surface of the eye core.

Here, two eye cores and two cap cores may be provided.

In the thin high-capacity transformer of the present invention as described above, by inserting two eye cores in parallel in one bobbin, and combining two cap cores in the upper part of the bobbin into which the eye core is inserted, a high-capacity thin transformer is formed. When the power is supplied to a large number of lamps provided in a large size LCD, the cross-sectional area of the magnetic path, that is, the cross-sectional area of the core, is wider than that of the existing small-capacity transformer, thereby preventing degradation of the transformer and improving power processing capability. In addition, it is possible to reliably handle a large amount of power supply while installing a small number of transformers.

In addition, the workability is improved because the hassle of having to install several small-capacity transformers inside the inverter as in the prior art improves workability and greatly reduces work processes and working time, thereby improving productivity. have.

In addition, since the transformer is thin and thin, but the capacity is configured in a large capacity, there is an effect that can be more efficiently spaced than conventional in terms of space utilization inside the inverter in which the transformer is installed.

In addition, in the present invention, since two gyros are formed from two icores arranged in parallel, the transformer reduces power loss, increases efficiency, and is stable compared to the method of manufacturing and applying the icore and capcore into one integrated structure. It has the advantage of supplying power, and can reduce the grinding tolerances generated during the manufacturing process of the eye core and cap core, thereby preventing the performance degradation of the product due to poor contact.

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

3 is a perspective view showing a thin high-capacity transformer for an inverter according to an embodiment of the present invention, Figure 4 is an exploded perspective view of FIG. 5 is a front sectional view of FIG. 3, and FIG. 6 is a side sectional view of FIG. 3.

As shown in Figures 3 to 6, the inverter thin high-capacity transformer 100 according to the present invention has a shape in which two conventional small-capacity transformers are connected in parallel, a bobbin in which a low pressure coil and a high pressure coil are wound. 110 and two “I” shaped cores 120a and 120b (hereinafter, referred to as “I-cores”) inserted into the bobbin 110 and the i-cores 120a and 120b. Covering the upper portion of the bobbin 110 and comprises two cap cores (130a, 130b) in contact with the eye core (120a, 120b).

In the center of the bobbin 110, a hollow portion 102 having a size capable of inserting two eye cores 120a and 120b in parallel is formed. At this time, the hollow portion 102 is preferably to have a shape and size that the two eye cores (120a, 120b) can fit tightly.

In addition, when the eye cores 120a and 120b are inserted into the hollow portion 102, the ends of the bobbin 110 opposite to the portions where the eyecores 120a and 120b are inserted are not pushed out to the other side. The upper jaw 118 is formed to be fixed.

In the state where the eye cores 120a and 120b are completely inserted into the hollow portion 102, the upper surface portions of both ends thereof are exposed upward, and both ends of the cap cores 130a and 130b are exposed on the exposed upper surface portions. The bottom part comes into contact with each other.

The cap cores 130a and 130b are coupled to the upper side of the bobbin 110 into which the eye cores 120a and 120b are inserted, and the upper portion of the low pressure coil and the high pressure coil wound around the outer periphery of the bobbin 110. A contact portion protruding from the front and rear end portions of the upper plate portion 131 so as to be in contact with each of the exposed upper surface portions of both ends of the eye cores 120a and 120b. It consists of 132 pieces.

When the cap cores 130a and 130b are coupled to the upper portion of the bobbin 110, the contact portion 132 contacts the exposed upper surfaces of both eye cores 120a and 120b, and the upper plate portion is the contact portion 132. Since the protruding width is spaced apart from the low pressure and high pressure coil by a predetermined distance, even if a high voltage is generated in the transformer by the cap cores 130a and 130b, the influence of electromagnetic waves due to the magnetic field may be minimized.

At this time, the eye cores 120a and 120b and the cap cores 130a and 130b of the present invention are made of a ferrite material, and preferably, the eyecores 120a and 120b are used as a manganese-zinc ferrite material. In addition, by using the cap cores 130a and 130b as nickel-zinc ferrite materials, two different ferrite cores are used to increase the efficiency of the transformer and to easily generate power.

The low pressure side connection terminal 113 and the high pressure side connection terminal 114 are formed at the rear end and the front end of the bobbin 110 so as to form an electrical connection path with the circuit inside the inverter.

In addition, a thin low-voltage coil (not shown) and a thick high-voltage coil (not shown) connected to the low pressure side connection terminal 113 and the high pressure side connection terminal 114 at both ends are respectively disposed on the outer circumference of the bobbin 110 at regular intervals. The low pressure coil winding unit 115 and the high pressure coil winding unit 116 are formed so as to be wound around them.

At this time, the low pressure coil winding 115 and the high pressure coil winding 116 forms a structure partitioned by a coil insulation partition 117 in the center.

On the other hand, on the seating surface 103 of the bobbin 110 in which the eye cores 120a and 120b are slidingly seated, the two eye cores 120a and 120b inserted into the hollow portion 102 at regular intervals. A long plate-shaped partition wall 111 is installed perpendicular to the seating surface 103 so as to be spaced apart from each other. At this time, the partition 111 is installed to cross the hollow portion 102 in the longitudinal direction in the center of the bobbin 110.

In addition, the front and rear ends of the partition 111, the interval maintaining piece 112 for spaced apart at regular intervals between the cap cores 130a and 130b coupled to the upper portion of the bobbin 110 is integrally. It is formed to protrude.

Meanwhile, before the cap cores 130a and 130b are coupled to the upper portion of the bobbin 110, the low pressure and high pressure coils and the cap core may be disposed between the bobbin 110 and the cap cores in which the low pressure coil and the high pressure coil are wound. An insulating sheet 140 having a “c” shape for allowing electromagnetic insulation between the 130a and 130b is provided. The insulating sheet 140 is preferably provided to a size that can completely cover the upper and left and right sides of the low pressure coil and the high pressure coil wound around the outer periphery of the bobbin 110.

The high-capacity transformer 100 according to the present invention sequentially combines the insulating sheet 140 and the cap cores 130a and 130b on the bobbin 110 on which the low pressure and high pressure coils (not shown) are wound. In the state where the bottom of the contact portion 132 of the core (130a, 130b) is temporarily fixed by fixing means such as tongs so as to contact the upper surface of both ends of the eye core (120a, 120b) inserted into the hollow portion 102, respectively As shown in FIG. 3, the cap cores 130a and 130b are fixed to the outer surface of the contact portions of the eye cores 120a and 120b with an epoxy 150.

As such, in the present invention, two eye cores 120a and 120b are inserted into one bobbin 110 in parallel, and two eye cores 120a and 120b are inserted into two upper portions of the bobbin 110. Combining the cap cores 130a and 130b to form a large-capacity thin transformer, when supplying power to a large number of lamps included in a large LCD, the cross-sectional area of the gyro, that is, the cross-sectional area of the core, compared to the existing small-capacity transformer As a result, it is possible to prevent the deterioration of the transformer and improve the power processing capacity, and to install a small number of transformers, and to stably handle a large amount of power supply. In addition, as it is possible to reduce the inconvenience of having to install several small-capacity transformers inside the inverter as in the prior art, workability is improved, and work processes and working time can be greatly reduced, thereby improving productivity. have. In addition, since the transformer is thin and thin, but the capacity is configured in a large capacity, there is an effect that can be more efficiently spaced than conventional in terms of space utilization inside the inverter in which the transformer is installed.

In addition, in the present invention, two eye cores 120a and 120b are inserted into one bobbin 110 in parallel, and two caps are disposed on the upper portion of the bobbin 110 into which the eye cores 120a and 120b are inserted. By combining the cores 130a and 130b to form a large-capacity thin transformer, two paths are formed from the two icores 120a and 120b arranged in parallel, so that the icore and the capcore are integrated into one. Compared with the method of fabricating and applying the structure, it has the advantage of reducing the power loss of transformer, increasing the efficiency and supplying the power stably, and reducing the contact tolerances that occur during the manufacturing process of i-core and cap-core. This can prevent the performance degradation of the product in advance.

On the other hand, the high-capacity transformer of the present invention can be configured with a transformer of a supercapacity in which two or more eye cores and cap cores are arranged in parallel unlike the above-described embodiment.

7 shows a thin high-capacity transformer for an inverter having a plurality of eye cores according to another embodiment of the present invention, as shown, three eye cores 120a and 120b (inside the bobbin 110 of the transformer) By inserting 120c in parallel, and combining three cap cores 130a, 130b, 130c in the upper part of the bobbin 110 corresponding to the eye cores 120a, 120b, 120c, The ultra-large-capacity thin transformer having a higher power processing capacity than the large-capacity transformer of the embodiment can be manufactured.

On the other hand, Figure 8 is a perspective view showing a thin high-capacity transformer for an inverter according to another embodiment of the present invention, Figure 9 is an exploded perspective view of Figure 8, Figure 10 is a side cross-sectional view of FIG.

As shown in Figure 8 to 10, in the thin high-capacity transformer according to another embodiment of the present invention, the hollow portion that can be inserted two eye cores (120a, 120b) in the front and rear direction of the bobbin 110 (102) is provided, the partition wall 111 for spaced apart at regular intervals between the eye core (120a) (120b) is formed in the center, and the low pressure side connecting terminal ( 113 and the high voltage side connection terminal 114 are formed.

In addition, two upper cap cores 130a and 130b respectively disposed on the upper and lower portions of the bobbin 110 so as to contact both of the eye cores 120a and 120b, respectively, at the upper and lower portions of the bobbin 110. And lower cap cores 134a and 134b.

In this case, the front and rear end portions of the eye cores 120a and 120b are partially exposed to the outside of the hollow portion 102, as shown in FIG. 10, the upper and lower cap cores 130b. Both ends of the 134b are in direct contact with both ends of the eye core 120b and directly connected to the bottom surface thereof.

As described above, the present invention is provided with upper and lower cap cores 130a, 130b, 134a, and 134b in contact with the eye cores 120a and 120b at the upper and lower portions of the bobbin 110. The lower cap cores 130a, 130b, 134a, and 134b are symmetrically formed on the upper and lower portions of the transformer. At this time, in the accompanying drawings, the configuration of the gap maintaining piece 112 and the insulating sheet 140 shown in the above-described embodiment is omitted without showing separately.

In addition, the transformer of the present invention, as in the embodiment of another embodiment shown in Figure 11, by extending the protruding length of the contact portions of both ends of the upper and lower cap cores (130b, 134b) in contact with the eye core (120b) The front and rear ends of the eye core 120b inserted into the bobbin 110 fit with the inner surface of each end of the upper and lower cap cores 130b and 134b without being exposed to the outside of the hollow portion 102. It may also be configured in contact form.

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

Figure 2 is a schematic circuit diagram showing a state of use of the transformer for inverters according to the prior art.

Figure 3 is a perspective view of a thin high-capacity transformer for an inverter according to an embodiment of the present invention.

4 is an exploded perspective view of FIG. 3.

5 is a front cross-sectional view of FIG. 3.

6 is a side cross-sectional view of FIG. 3.

7 is a perspective view showing a thin high-capacity transformer for an inverter according to another embodiment of the present invention.

8 is a perspective view showing a thin high-capacity transformer for an inverter according to another embodiment of the present invention.

9 is an exploded perspective view of FIG. 8;

10 is a side cross-sectional view of FIG. 8.

Figure 11 is a side cross-sectional view showing another form of coupling structure of the cap core.

*** Explanation of symbols for the main parts of the drawing ***

100: Thin High Capacity Transformer for Inverter

110: bobbin 111: bulkhead

112: spacing maintenance 120a, 120b: i-core

130a, 130b: Capcore 140: Insulation sheet

Claims (7)

A bobbin having a hollow portion formed in the center thereof, and having a low pressure side connection terminal and a high pressure side connection terminal for forming an electrical connection path at both ends; A low pressure coil and a high pressure coil wound around the outer circumferential surface of the bobbin at predetermined intervals so as to be connected to the low pressure side connection terminal and the high pressure side connection terminal, respectively; A plurality of i-cores inserted in parallel in the hollow portion of the bobbin; The low pressure and high pressure coils cover the upper portion of the bobbin wound, and both ends are made of a plurality of cap cores in contact with the eye core, Thin bobbin transformer for inverter, characterized in that the bobbin is formed with at least one partition wall for spacing at a predetermined interval between the plurality of eye cores inserted into the hollow portion. The thin-capacity transformer for an inverter of claim 1, further comprising at least one spacing member for separating the plurality of cap cores at a predetermined interval. 3. The thin high capacity transformer for inverters according to claim 2, wherein the gap maintaining piece is integrally formed on an upper portion of the partition wall. 4. The thin high capacity transformer for inverters according to claim 2 or 3, further comprising an insulating sheet interposed between the low and high voltage coils and the cap core to electrically insulate them. 5. The thin mass transformer for inverters of claim 4, wherein both ends of the cap core are fixed through epoxy in contact with the upper surface of the eye core. 6. The thin high-capacity transformer for inverters according to claim 5, wherein the eye core and the cap core are each provided in two. The thin-capacity transformer for inverters of claim 1, further comprising a plurality of cap cores covering lower portions of the bobbins on which the low and high pressure coils are wound, and a plurality of cap cores whose both ends contact the eye cores.

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