KR100632005B1 - A transformer for inverter of push-pull type - Google Patents

Abstract

A transformer for a push-pull type inverter is provided to reduce a space ratio of the transformer occupying an inverter board by drawing out an intermediate tap from a primary coil. A bobbin(110) has at least one primary coil and plural secondary coil. Plural coil connection pins(115) are electrically connected to the primary and secondary coils. A fixing cap(120) has a bobbin receiving portion and core penetrating holes formed both ends of the bobbin receiving portion. A pair of cores are inserted into the core fixing holes to fix the bobbin in the fixing cap. A binding pin is electrically connected to the primary coil.

Description

Transformer for push-pull inverters {A Transformer for Inverter of Push-Pull Type}

1 is a perspective view showing a transformer for a conventional inverter.

Figure 2 is an exploded perspective view showing a conventional inverter transformer.

3A, 3B, and 3C are circuit diagrams of a conventional inverter transformer.

4 shows a transformer for a push-pull inverter according to the present invention,

(a) is a perspective view from above.

(b) is a perspective view from the bottom.

5 shows a transformer for a push-pull inverter according to the present invention,

(a) is an exploded perspective view seen from the top.

(b) is an exploded perspective view from the bottom.

Figure 6 shows a transformer for a push-pull inverter according to the present invention,

(a) is a perspective view of a bobbin.

(b) is a perspective view of a fixing gap.

(c) is a perspective view of a core.

7 is a plan view of a transformer for a push-pull inverter according to the present invention;

8 (a) and (b) are circuit diagrams of a transformer for a push-pull inverter according to the present invention;

Explanation of symbols on the main parts of the drawings

110: bobbin 111,112: primary and secondary coil winding groove

114: core fixing hole 115: coil connecting pin

116: pin portion 120: fixed cap

121: bobbin arrangement portion 122: core through hole

123: opening 130: core

The present invention relates to a transformer provided in an inverter, and more particularly, it is possible to implement a push-pull circuit in a transformer constituting one primary coil and two secondary coils in one bobbin, thereby producing a low-cost product. The present invention relates to a transformer for a push-pull inverter.

Commonly known cold cathode fluorescent lamps (COLD CATHODE FLUORESCENT LAMP) are light source lamps using COLD EMISSION, which enables low heat generation, high brightness, long life, and full color. This is the most suitable light source lamp as a back light of the liquid crystal display.

In addition, such a light source lamp does not emit light by itself and simply needs a light shutter to display a figure or a character by performing only a shutter function, and thus, a source of light from behind the liquid crystal panel. It refers to the light source used as.

Accordingly, an inverter (resonant type) transformer for boosting a low voltage alternating current input to a high voltage alternating current is mainly employed as a transformer for supplying a current to the light source lamp and turning it on.

As shown in FIGS. 1 and 2, the inverter transformer 50 has a bobbin in which primary and secondary coils 51a and 51b are wound, and connecting pins 53a and 53b are integrally protruded from both ends thereof. (52) and the bobbin is inserted into the center so that the left and right pairs of magnetic cores 54 inserted into the core fixing part 55 penetrating the center of the body of the bobbin 52 and the upper side of the bobbin 52 are disposed. The hole 56 is formed of a fixing cover 57 formed therethrough, and the fixing cover 57 penetrates the core fixing grooves 58 on the inner surface corresponding to the core fixing part 55.

Accordingly, the bobbin 52 in which the primary and secondary coils 51a and 51b are wound is disposed in the fixed cover 57 through the bobbin insertion hole 56, and the core fixing parts 55 coincide with each other. And the core 54 through the core fixing groove 58 to integrally assemble the bobbin 52, the core 54 and the fixing cover 57, and connecting pins 53a and 53b of the bobbin 52. ) Are electrically connected to the power supply as the input terminal and the lamp as the output terminal.

On the other hand, the inverter transformer 50 can be applied to a large capacity of 1KW or less while the switch is alternately turned on / off as shown in Fig. 3 (a) (b) mainly the push-pull circuit of the simple driving circuit In the push-pull inverter, which uses two lamps, one or two transformers are used, and in the push-pull inverter, which uses four lamps, two or four transformers are used. ) Energy is transmitted to the secondary coil 51b to light the lamp.

In the case of adopting such a circuit method, the area ratio of the transformer occupying the entire inverter board is relatively large, and manufacturing cost is high, which is contrary to the trend of developing a low-cost inverter. Likewise, a low-cost transformer structure consisting of one primary coil 51a and two secondary coils 51b should be adopted.

However, in such a transformer structure, a push-pull circuit cannot be applied, thereby reducing the volume of the transformer on the board of the inverter, thereby reducing the size of the finished product and reducing the manufacturing cost of the product.

Accordingly, the present invention has been made to solve the above problems, the object of the push is to implement a push-pull circuit in a transformer consisting of one primary coil and two secondary coils in one bobbin -To provide a transformer for pull type inverter.

As a technical means for achieving the above object, the present invention

At least one primary coil is wound, a plurality of secondary coils are wound, bobbins having a plurality of coil connecting pins formed through the core fixing holes at both ends and electrically connected to the first and second coils;

A fixed cap having a bobbin arrangement portion into which the bobbin is placed, and having core through holes at both ends of the bobbin arrangement portion;

A pair of cores inserted through the core fixing holes coincident with the core through holes to fix the bobbin in the fixing cap; And

A connection pin electrically connected to the primary coil so as to give an intermediate tap to the primary coil; Provides a transformer for a push-pull inverter comprising a.

Preferably, the connection pins are respectively provided on the left and right pair of pin portions extending from the center of the body of the bobbin to the left and right sides.

Preferably, the connection pin is a pin member connected to the center of the length of one primary coil.

Preferably, the connection pin is a pin member for connecting between two primary coils.

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

Figure 4 (a) (b) is a perspective view showing a transformer for a push-pull inverter according to the invention, Figure 5 (a) (b) is an exploded view showing a transformer for a push-pull inverter according to the present invention Figure 6 (a) (b) (c) is a perspective view showing a bobbin, a fixing cap and a core employed in the push-pull inverter transformer according to the present invention.

Inverter transformer 100 of the present invention, as shown in Figures 4 (a) (b) to 6 (a) (b) (c), the bobbin 110, the fixed gap 120, the core 130 ) And the connection pin 140 is configured.

The bobbin 110 has a coil winding primary coil winding groove 111 and a secondary coil in a body to wind at least one primary coil (not shown) and two secondary coils (not shown) a predetermined number of times. When each of the winding grooves 112 is provided, the winding regions are divided by the planar portion 113 of the primary and secondary coil winding grooves 111 and 112.

The body of the bobbin 110 has a core fixing hole 114 penetrating in the longitudinal direction, and has a plurality of coil connecting pins 115 electrically connected to the primary and secondary coils, respectively, and the coil connection. The pins 115 are respectively fixed to the plurality of pin portions 116 extending integrally from the body of the bobbin 110.

In addition, the fixed gap 120 is provided with a bobbin arrangement portion 121 into which most of the bobbin 110 is inserted while only a part of the bobbin 110 is exposed to the outside, and the bobbin arrangement portion 121 of Both ends are provided with core through-holes 122, respectively.

The bobbin arrangement portion 121 forms an opening 123 having a predetermined size to expose the flat portion 113 to the outside, and the bobbin 110 and the left and right sides of the bobbin arrangement portion 121. When the fixing cap 120 is coupled to the coil connection pin 115 is preferably provided with a plurality of pin arrangement groove 124 that can be inserted.

At this time, the bobbin arrangement portion 121 and the pin arrangement groove 124 is preferably recessed in the same direction.

In addition, the core 130 is a through-hole core 122 of the fixing gap 120 is matched with each other to fix the bobbin 110 disposed in the bobbin arrangement portion 121 of the fixing cap 120 And a pair of inserts inserted into the core fixing hole 114 of the bobbin 110.

The core 130 is composed of a core insert hole 131 and a central insert 131 inserted into the core through hole 122 and the auxiliary insert 132 positioned in parallel to both sides thereof. 132 is inserted into the space between the bobbin arrangement portion 121 and the pin arrangement groove 124.

On the other hand, the connection pin 140 is a pin member electrically connected to the primary coil so that the intermediate tap from the primary coil wound in the primary coil winding groove 111 of the bobbin 110.

The connection pins 140 are respectively provided on the left and right pair of pin parts 116 extending from the center of the body of the bobbin 110 to left and right sides.

Here, the connection pin 140 is a pin member that is connected to draw an intermediate tap from the center of the length of one primary coil wound on the bobbin 110 or to draw the intermediate tap from between the two primary coils. It can be composed of a pin member to be connected to.

When power is applied to the transformer 100 of the present invention having the above configuration, as shown in FIGS. 7 and 8 (a) and (b), the magnetic field generated in the primary coil L1 is the core 130. After being induced into the secondary coils P1 and P2 to boost the low voltage to a high voltage, the lamps electrically connected to the respective coil connection pins 115 are turned on.

While the invention has been shown and described with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit or scope of the invention as set forth in the claims below. I would like to clarify that knowledge is easy to know.

According to the present invention as described above, a connection pin is added between the primary coils so that a push-pull circuit can be applied to a transformer structure having one or two primary coils and a secondary coil in one bobbin. By drawing an intermediate tap in the primary coil and reducing the area ratio of the transformer occupied on the inverter board, the size of the product can be reduced, and the manufacturing cost can be reduced to manufacture a low cost product.

Claims (4)

At least one primary coil is wound, a plurality of secondary coils are wound, bobbins having a plurality of coil connecting pins formed through the core fixing holes at both ends and electrically connected to the first and second coils; A fixed cap having a bobbin arrangement portion into which the bobbin is placed, and having core through holes at both ends of the bobbin arrangement portion; A pair of cores inserted through the core fixing holes coincident with the core through holes to fix the bobbin in the fixing cap; And A connection pin electrically connected to the primary coil so as to give an intermediate tap to the primary coil; Transformer for push-pull inverter comprising a. The method of claim 1, The connection pin is a transformer for a push-pull inverter, characterized in that each provided on the left and right pair of pins extending from the center of the bobbin to the left and right sides. The method of claim 1, The connection pin is a push-pull inverter transformer, characterized in that the pin member is connected to the center of the length of one primary coil. The method of claim 1, The connection pin is a push-pull inverter transformer, characterized in that the pin member for connecting between the two primary coils.

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