KR100534375B1 - Transformer for inverter - Google Patents

Abstract

Disclosed is to arrange the primary winding in the center and the secondary winding on both sides to drive two secondary windings with one primary winding to minimize the current deviation between both ends of output and to simplify the structure to increase the manufacturing efficiency and manufacturing cost The present invention relates to a transformer for inverters that can reduce power consumption. The present invention winds up the primary winding in the center of the bobbin and winds a pair of left and right secondary windings on both sides of the primary winding by a predetermined distance therebetween, so that a pair of cores face each other from the outside of the secondary windings. And an input current is applied to the primary winding side to generate two transformed output currents through the pair of secondary windings.

Description

Transformer for inverters

The present invention relates to a transformer used in an inverter for lighting a discharge tube of a cold cathode fluorescent lamp, a hot cathode fluorescent lamp, a mercury lamp, a sodium lamp, a metal halide lamp, a neon lamp, and the like. The present invention relates to an inverter transformer capable of increasing the manufacturing efficiency and reducing the manufacturing cost by minimizing the current deviation between both ends of the output and simplifying the structure by driving two secondary windings by arranging secondary windings in one primary winding.

In general, a high voltage is required to light a discharge tube used for an inverter stand, a fluorescent ballast, a monitor, a notebook computer, and the like, and a transformer for boosting voltage is essential. Cold Cathode Fluorescent Lamp (CCFL) is widely used as backlight lamp of LCD panel. Inverter is essential for driving CCFL, and transformer part is important in designing and manufacturing inverter. Occupies. However, in the case of the LCD panel, if the number of lamps used is multiple, the number of transformers should be provided in proportion to the number.

One example of a conventional inverter transformer is shown in FIGS. 1A and 1B. Figure 1a is a circuit diagram of a conventional inverter transformer, Figure 1b is a view showing the actual configuration of Figure 1a. Here, an example of a transformer for driving four lamps is internally composed of a pair of transformers, and each transformer drives two lamps to drive four lamps as a whole.

As shown, the same pair of transformers 20 and 20a are disposed on both sides of one controller 10 so as to face each other. Each of the transformers 20 and 20a winds the primary windings 24 and 24a and the secondary windings 26 and 26a together on the bobbins 22 and 22a, and is paired on both sides of the bobbins 22 and 22a. It is constructed by opposingly inserting the EE type cores 28, 28a and 28b, 28c. The wires are drawn out from the primary windings 24 and 24a of each of the transformers 20 and 20a configured as described above and connected to the controller 10. Therefore, the current applied from the controller 10 is induced to the secondary windings 26 and 26a while flowing through the primary windings 24 and 24a, and the secondary windings 26 and 26a side by the voltage ratio corresponding to their turns ratio. The voltage is boosted or reduced at to output the current. The current output through the output terminals on the secondary windings 26 and 26a drives the four lamps 30 to 30c connected thereto.

In the conventional inverter transformer as described above, separate primary windings and secondary windings are used for each transformer as described above, and two EE-type cores are used. The unit price also had a disadvantage. In particular, since the primary winding and the secondary winding are used separately for each transformer, it is difficult to match the number of turns for each winding, and as a result, variations in inductance (L) values and output currents occur in each transformer. Many.

Accordingly, an object of the present invention is to solve the above-mentioned drawbacks, by arranging the primary winding in the center and the secondary winding on both sides to drive two secondary windings with one primary winding between the output both ends It is to provide an inverter transformer that can increase manufacturing efficiency and reduce manufacturing cost by minimizing current deviation and simplifying structure.

An inverter transformer according to the present invention for achieving the above object is a bobbin wound around the primary winding, the primary winding is spaced a predetermined distance from the primary winding and the secondary winding is wound to the left and right sides; And a pair of left and right cores mounted on left and right sides of the bobbin, and applying an input current to the one primary winding located at the center to output two currents respectively transformed at the pair of secondary windings. It is characterized by. The bobbin is characterized in that the primary bobbin portion in which the primary winding is wound and the left and right pair of secondary bobbin portions in which the pair of secondary windings are wound are integral or separated.

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

Figure 2a is a circuit diagram of a transformer for inverters according to the present invention, Figure 2b is a view showing the actual configuration of Figure 2a. 3 is an exploded perspective view showing the configuration of the present invention in detail.

As shown, the inverter transformer 100 of the present invention is the left and right secondary bobbin (140,140) in which the secondary winding (130, 130a) is wound on both sides of the primary bobbin 120 wound around the primary winding (110). a) is mounted, and a pair of cores 150 and 150a are opposedly inserted from the outside of the left and right secondary bobbins 140 and 140a.

To this end, the transformer 100 is disposed in the center of the primary bobbin 120 wound around the primary winding 110 that is connected to the controller 160 receives a current. The primary bobbin 120 is preferably a rectangular cylinder having left and right openings as illustrated in the hollow form, and can be manufactured in other polygonal cylinders or cylinders in addition to a pentagonal cylinder and a hexagonal cylinder. The mounting portions 142 and 142a of the left and right secondary bobbins 140 and 140a are inserted into the hollow 122 of the primary bobbin 120. Of course, the primary bobbin 120 is formed around the left and right outer periphery of the left and right regulatory jaws for regulating the primary winding 110 wound as a failure does not escape to the outside. In addition, current input terminals 126 and 126a for receiving current from the controller 160 are also provided. The material of the primary bobbin 120 is preferably LCP (Liquid Crystal Polymer) series and the primary winding 110 is a UEW (Polyurethane Enameled Copper Wires) class.

The secondary bobbins 140 and 140a wound around the secondary windings 130 and 130a also have a cylindrical shape having left and right openings. The secondary bobbins 140 and 140a preferably have a rectangular cylindrical shape as in the present embodiment. As described in the description, it is possible to manufacture a pentagonal cylinder, a hexagonal cylinder, or another polygonal cylinder or cylinder. Secondary bobbins 140 and 140a are inserted into and mounted opposite pairs of the same structure on the left and right sides of the primary bobbin 120 as shown, and thus the left and right secondary bobbins 140 and 140a facing the primary bobbin 120. At the inner end thereof, mounting parts 142 and 142a are inserted and mounted in the hollow 122 of the primary bobbin 120, and the partitions 144 and 144a are disposed at predetermined intervals in the outward direction adjacent to the mounting parts 142 and 142a. It is formed around the outer circumference. Accordingly, the partition and the partition to form a constant recessed winding groove (146,146a), the secondary winding (130, 130a) is wound there. As such, the secondary windings 130 and 130a are wound around the winding grooves 146 and 146a separated by the partitions 144 and 144a at regular intervals, thereby distributing the output voltage, thereby being resistant to breakdown voltage. In particular, in the winding grooves of the secondary bobbins 140 and 140a closest to the primary bobbin 120, the secondary windings 130 and 130a are not wound and are left blank, and after coupling, the primary winding side and the secondary winding side To reinforce the breakdown voltage and to secure a stable voltage difference between the two windings. The rear terminals of the secondary bobbins 140 and 140a are provided with output terminals 148 and 148a which are connected to the secondary windings 130 and 130a and output the transformed voltages. As the material of the secondary bobbins 140 and 140a, the same LCP material as the primary bobbin 120 is suitable. As the secondary windings 130 and 130a, in addition to the UEW class described above, PEW (Polyester enameled copper wires) grade is used. Can be.

A pair of EE type cores 150 and 150a are inserted into the core insertion holes 149 and 149a of the left and right secondary bobbins 140 and 140a so as to face each other from the left and right sides. As described above, only two cores 150 and 150a inserted into the secondary bobbins 140 and 140a may constitute a pair of transformers capable of outputting two currents. Cores 150 and 150a are important factors that affect the flow of magnetic flux and affect inductance value and leakage flux. Magnesium (Mg) and nickel (Ni) series are suitable for core 150 and 150a materials.

The present invention is also equipped with a left and right pair of cores (150, 150a), the primary winding 110 is wound around the primary bobbin 120 and the secondary winding 130 is wound around the left and right secondary The insulation tapes 170, 172 and 172a are wound around the bobbins 140 and 140a, respectively, to reinforce the breakdown voltage between the core and the windings generated during operation and to provide an insulation effect.

4A is a plan view showing a state in which primary and secondary windings are wound around respective bobbins in the present invention, FIG. 4B is a side cross-sectional view of FIG. 4A, and FIG. 4C is a cross-sectional view taken along line AA of FIG. 4A. .

The primary bobbin 120 is located between the pair of secondary bobbins 140 and 140a located at the left and right sides thereof, and the winding groove 128 is divided into the restricting jaws 124 and 124a protruding both outer peripheral edges on the outer circumferential surface thereof. This primary winding 110 is wound up. Input terminals 126 and 126a are provided at both ends of the primary bobbin 120 to apply a current to the wound primary winding 110. In particular, the primary bobbin 120 is a hollow type, as shown in Figure 4b as a whole, the hollow 122 is formed in the center can enter the secondary bobbins 140, 140a from the left and right. Mounting parts 142 and 142a provided at the inner ends of the left and right pair of secondary bobbins 140 and 140a which are positioned to face the hollow 122 are inserted and mounted in half. For this reason, the primary bobbin 120 and the secondary bobbins 140 and 140a of the present transformer are easy to be combined at the time of assembly and are also easily separated at the time of hydraulic replacement.

Two secondary bobbins (140, 140a) are inserted and mounted opposite to the left and right sides of the primary bobbin 120, each inner end of the mounting portion (142, 142a) is inserted into the hollow 122 of the primary bobbin 120 On the outside thereof, partitions 144 and 144a are formed at regular intervals. The partitions 144 and 144a are formed at equal intervals while circumscribing the outer circumferential surfaces of the secondary bobbins 140 and 140a to provide winding grooves 146 and 146a therebetween, and the partitions 144 and 144a which circumscribe the outer circumferential surface. Predetermined portions of the secondary windings 130, 130a wound around the outer circumferential surface as shown in Figure 4c is able to move to the next winding groove. Since the secondary windings 130 and 130a are wound in the plurality of winding grooves 146 and 146a separated as described above, the output voltage is distributed, and thus the transformer has a structure withstanding the breakdown voltage. At this time, the first winding grooves 146 and 146a closest to the mounting portions 142 and 142a are wound from the next groove without the secondary windings 130 and 130a, thereby reinforcing the internal pressure so as not to affect adjacent wires. ) And sufficient space to obtain a voltage difference of about 1.5 KVrms between the secondary windings 130 and 130a.

Of course, the primary bobbin 120 and the secondary bobbin (140,140a), which has been wound, are equipped with cores 150 and 150a, and then wound the insulating tapes 170, 172 and 172a around the core 150 and 150a. The insulation effect is provided, and the breakdown voltage (insulation voltage) between the cores 150 and 150a and the windings 110, 130a and 130a generated during operation is further improved. Preferably, before winding the insulating tapes 170, 172 and 172a, an insulator (not shown) is inserted into the primary bobbin 120 and the secondary bobbins 140 and 140a, and then the cores 150 and 150a are mounted. ) And the insulation effect between the bobbin (120,140,140a) is good. In this case, as the insulator to be used, a pair of L-shaped injection insulating plates fitted between the two protrusions of the EE type cores 150 and 150a and the bobbins 120, 140 and 140a or an insulating tape may be used.

Figure 5a is a schematic diagram for explaining the binding principle of the removable bobbin, Figure 5b is a perspective view showing a state in which the removable bobbin is coupled. 2A to 5B, the assembly method and operation principle of the transformer employing the split bobbin will be described below.

The primary winding 110 is performed on the primary bobbin 120, and at the same time, the secondary winding 130 is also applied to the left and right pair of secondary bobbins 140 and 140a. Then, the mounting portions 142 and 142a of the secondary bobbins 140 and 140a are inserted into the hollows 122 at the left and right sides of the primary bobbin 120 to be coupled. Then, the primary bobbin 120 and the left and right pair of secondary bobbins 140 and 140a are combined, and in the state, the left and right pair of secondary bobbins 140 and 140a coupled to both sides of the primary bobbin 120. A pair of EE-type cores 150 and 150a is mounted on the outside of the module. Then, the central protrusions 152 and 152a of the EE-type cores 150 and 150a are inserted into the core insertion holes 149 and 149a of the secondary bobbins 140 and 140a and both protrusions 154,156,154a and 156a of the cores 150 and 150a. ) Is spaced apart by a predetermined interval to the outer both sides of the secondary bobbin (140,140a). In such a state, the primary winding 110 and the secondary windings 130 and 130a wound around the primary bobbin 120 and the secondary bobbins 140 and 140a, as well as to surround the cores 150 and 150a. When the insulating tapes 170, 172 and 172a are wound around the bobbins 120, 140 and 140a, the assembly of the transformer is completed.

As described above, the controller 160 is connected to the input terminals 126 and 126a of the primary winding 110 of the transformer assembled as described above to receive an input current, and then the primary winding 110 and the secondary windings 130 and 130a. The transformer is transformed by mutual induction) and is output through the output terminals 148 and 148a connected to the secondary windings 130 and 130a. Of course, in the present invention, since the two secondary windings 140 and 140a are designed to face each other as opposed to one primary winding 110, two transformer outputs can be obtained using one primary winding 110. have. That is, the transformed currents are output from the left and right pairs of secondary windings 140 and 140a, respectively. Thus, since the primary winding 110 is used in common, a more uniform current can be obtained by paying attention only to the two secondary windings 130 and 130a. Therefore, it is easy to design a stable transformer and minimize the current deviation output from the two secondary windings.

As described above, mounting portions are formed in the hollow bobbin 122 in the primary bobbin 120 and inserted into and coupled to the hollow 122 at corresponding portions of the left and right pair of secondary bobbins 140 and 140a corresponding thereto. By providing the 142 and 142a, the assembly of the primary side and the secondary side bobbins 120, 140 and 140a can be easily improved. Of course, in this case it is easy to remove the separation is easy to repair and replace the bobbins during maintenance. As described above, the bobbin is advantageous in terms of assembling and repairing when manufactured in a separable type, but may be slightly advantageous in terms of manufacturing cost while maintaining and repairing slightly when constructing as an integral type to be described later.

6 is a view showing the configuration of the integral bobbin as another embodiment of the bobbin in the transformer of the present invention, as shown, the bobbin 230 in which the primary winding 210 and the secondary windings 220 and 220a are wound integrally. Thus, the primary winding portion 232 in which the primary winding 210 is wound in the center of the integrated bobbin 230 and the secondary winding portions 234 and 234a in which the secondary windings 220 and 220a are wound in the primary winding portion 232. It can be formed on both the left and right sides. In this way, the overall shape formed of the primary winding part 232 and the left and right secondary winding parts 234 and 234a is the same as the above-described separate type is completely combined. Of course, the primary winding 210 is wound around the primary winding 232 partitioned by the restricting jaws, and the secondary windings 220 and 220a are wound around the secondary windings 234 and 234a divided into partitions. After the winding is finished, the insulating tapes 240, 242, 242a are wound on the finish.

As such, the unitary body is formed in a form in which the bobbin is separated from the primary bobbin of the detachable type and the secondary bobbins on the left and right sides, and the other components are formed in the same manner as the detachable type. Therefore, the rest of the description is the same as the separate type, so a detailed description thereof will be omitted.

In addition to the fully integrated type (shown in FIG. 6) or fully detachable type (shown in FIGS. 2A to 5B) described above, two bobbins are used to wind the primary winding together with the secondary winding on one bobbin and two on the other bobbin. It can also be configured by winding only the car winding. Of course, at this time the two bobbins are coupled so that the primary winding is centered, and it is convenient to insert and combine the mounting grooves and mounting protrusions that can be fitted to each other in the corresponding coupling portion.

The embodiments disclosed herein are only presented by selecting the most preferred examples to help those skilled in the art from the various possible examples, the technical spirit of the present invention is not necessarily limited or limited only by this embodiment, the present invention Various changes and modifications are possible within the scope without departing from the spirit of the invention, as well as other equivalent embodiments.

As described above, the inverter transformer according to the present invention arranges the primary windings in the center and the secondary windings on both sides thereof to drive two secondary windings with one primary winding and two with a pair of cores. By constructing the transformer output unit, it is possible to reduce the parts to simplify the structure. In addition, by forming the hollow by forming the primary bobbin hollow, and having a mounting portion inserted into the hollow in the corresponding portions of the left and right pair of secondary bobbin corresponding to the assembly of the primary side and the secondary side bobbin easily Can improve sex. Accordingly, the manufacturing efficiency is increased and the manufacturing cost is reduced. Furthermore, since the primary windings are commonly used, it is easy to design a stable transformer and minimize the current deviation output from the two secondary windings.

Detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings, in which numerals designate corresponding parts in the drawings.

1a and 1b is a circuit diagram of a conventional inverter transformer and its actual configuration,

2a and 2b is a circuit diagram of the inverter transformer according to the present invention and its actual configuration,

3 is an exploded perspective view showing in detail the configuration of the present invention,

4A to 4C are plan views, side cross-sectional views, and A-A cross-sectional views showing a state in which the primary windings and the secondary windings are wound on respective bobbins in the present invention;

5a and 5b is a schematic view and a perspective view for explaining the binding principle of the separated bobbin,

6 is a view showing the configuration of the integral bobbin in the transformer of the present invention.

** Explanation of symbols for main parts of drawings **

110: primary winding 120: primary bobbin

122: long hole 124,124a: regulation

126,126a: Input terminal 128: Winding groove

130: secondary winding 140,140a: secondary bobbin

142,142a: mounting portion 144,144a: partition

146,146a: winding groove 148,148a: output terminal

149,149a: Core insertion hole 150,150a: Core

160: controller 170,172,172a: insulation tape

210: primary winding 220: secondary winding

230: bobbin 232: primary winding

234,234a: secondary winding 240,242,242a: insulation tape

Claims (7)

The hollow is formed and the outer circumferential surface is provided with a primary bobbin wound around the primary winding, and a mounting portion fitted into the hollow of the primary bobbin is coupled to one side end facing the primary bobbin, respectively, and the secondary winding is wound on the outer circumferential surface thereof. A bobbin having a left and right pair of secondary bobbins coupled to both sides of the primary bobbin in a structure in which a core insertion hole is formed of a hollow body; And It includes a pair of left and right EE-type core which is entered into the core insertion hole of the secondary bobbin from the left and right outer side of the bobbin, By applying an input current to the one primary winding located in the center it is characterized in that to output the two currents respectively transformed on the pair of secondary winding side, In the primary bobbin, the jaws protrude from the left and right outer peripheries to provide a winding groove in which the primary winding is wound therebetween, and in the secondary bobbin, partitions protrude from the outer circumferential surface, so that the secondary spaces between the partitions. An inverter transformer, comprising: a winding groove in which a winding is wound. A bobbin of a hollow body in which a primary winding part in which the primary winding is wound and a pair of left and right secondary windings in which the secondary winding is wound on the left and right sides are spaced apart from the primary winding by a predetermined interval; And It includes a pair of left and right EE-type core that is fitted into and coupled from the left and right sides of the bobbin, By applying an input current to the one primary winding located in the center it is characterized in that to output the two currents respectively transformed on the pair of secondary winding side, In the primary winding part, the jaws protrude from the left and right outer periphery to provide a winding groove in which the primary winding is wound therebetween, and in the secondary winding part, partitions protrude from the outer circumferential surface, so that the secondary spaces between the partitions. An inverter transformer, comprising: a winding groove in which a winding is wound. delete delete The inverter of claim 1 or 2, wherein in order to reinforce the pressure resistance of the primary winding and the secondary winding, the secondary winding is not wound in the first compartment of the partition and is wound from the next compartment. Transformers. delete The inverter transformer of claim 1 or 2, wherein the primary winding and the secondary winding are wound around the bobbin and the insulation tape is wound after the core is mounted.