KR20200115391A - A planar transformer - Google Patents

Abstract

The present invention relates to a planar transformer. According to the present invention, the planar transformer includes: a flat plate-shaped primary upper coil element (110); a plate-shaped primary lower coil element (120) positioned to be in contact with or spaced apart from the primary upper coil element (110); and a plate-shaped secondary coil element (200) in which an induced current is generated by a current applied to the upper primary coil element (110) and the lower primary coil element (120). According to this, the generation of magnetic loss field is reduced, and the efficiency from a primary side to a secondary side is increased.

Description

Flat type transformer {A PLANAR TRANSFORMER}

The present invention relates to a transformer, and in particular, to a flat-panel transformer used in a charger or adapter.

In general, a transformer has a primary coil and a secondary coil, and generally, a primary coil is used as an input stage and a secondary coil is used as an output stage.

Among the transformers, "transformers" according to Patent No. 10-1579427 (announcement date: December 22, 2015) are disclosed in relation to small transformers used in mobile phone chargers.

In the case of a transformer according to No. 10-1579427 above, the primary coil element for a transformer is composed of a so-called "PCB-type primary coil element" implemented by patterning a conductive material on an insulating substrate.

The PCB type primary coil device according to the prior art is manufactured by coating a copper foil on an insulating substrate and forming a coil circuit pattern by etching or the like.

However, the transformer according to No. 10-1579427 above adopts a structure in which a primary coil element is inserted between two secondary coil elements, so there are problems in the generation of a loss magnetic field and efficiency from the primary side to the secondary side. . In addition, it was pointed out as a problem that the height of the product [transformer] as a whole is increased because the secondary coil element is separated from the bottom up.

In addition, since the conventional PCB type primary coil element forms a circuit pattern on the PCB substrate, there is a problem that the manufacturing period is basically long, and thus it is unsuitable for manufacturing a short delivery period. In addition, there is a problem that it is difficult to cope with design diversification (product tuning) because the PCB type primary coil element is basically patterned on the PCB substrate.

In addition, when the number of turns of the circuit pattern increases, there is a problem that the volume of the primary coil element increases due to the increase of the layer and the thickness of the PCB substrate, and the cost of the product increases due to the increase in the price of the PCB substrate. .

Document 1: Registered Patent Publication 10-1579427 (announcement date: 2015. 12. 22.) Document 2: Unexamined Patent Publication 10-2016-0041837 (Publication date: 2016.04.18.)

The present invention was created to solve the problems of the prior art as described above, and the object of the flat-panel transformer according to the present invention is,

First, by separating the primary coil element into a primary upper coil element and a primary lower coil element, the area in which the primary coil element 100 is in close contact with the secondary coil element 200 is increased to reduce leakage. And make it more efficient,

Second, by alternately arranging the primary and secondary coil elements (in a zigzag manner), the leakage magnetic field can be remarkably reduced, so that the efficiency from the primary coil element to the secondary coil element can be improved.

Third, by winding an insulation-coated wire to form the primary coil element, the height of the product [transformer] can be lowered and the thickness can be reduced.

Fourth, it is possible to improve the wire connection workability by making the wire connection work of connecting the primary coil element composed of a wire wound type to the primary terminal pin simple and convenient.

Fifth, by implementing the coil element on the primary side so that the insulating coated wires are in contact with each other and wound in a flat shape, unlike the conventional PCB substrate type primary coil element, the resistance is lowered to reduce heat generation (excellent heat generation characteristics), and It allows the transfer efficiency to the secondary side coil element to be improved,

Sixth, by manufacturing the primary coil element in a flat plate shape with an air core without using a bobbin, it is possible to reduce the size of the primary coil element itself.

Seventh, a product that is a problem of the conventional "PCB type primary coil device" as a substitute or substitute for the transformer primary coil device (so-called "PCB type primary coil device") implemented on the conventional PCB board. It is possible to solve the fact that the manufacturing cost of the product is high, the manufacturing time is long and the development period is long, it is not easy to cope with design tuning, and the volume of the product increases when the number of turns of the coil increases.

Eighth, by inserting the primary coil element between the inner protrusion and the outer protrusion, it prevents the flow or clearance of the primary coil element and enables stable mounting.

Ninth, by inserting the secondary coil element between the two upper and lower primary coil elements and the lower primary coil element, the generation of a magnetic loss field is reduced, so that the efficiency from the primary to the secondary can be increased.

Tenth, by bending the two connecting portions inward in a U-shape, the distance between the primary coil element and the secondary coil element can be further narrowed.

Eleventh, by connecting the upper coil element on the primary side and the lower coil element on the primary side in series by the configuration of a connection pin made of metal, it is possible to make the connection of two separated primary coil elements simple, easy and reliable.

Twelfth, it is possible to respond to various design environments by configuring the primary coil element into a mixed type of a wire wound type composed by winding an insulation coated wire and a PCB substrate type implemented on a PCB substrate.

Thirteenth, it is to provide a flat-panel transformer suitable for making the wiring work easier by configuring the primary coil element with an alpha coil, and making the product thickness relatively thin since there is no need to cross the coil to wire. .

The planar transformer according to the present invention for achieving the above object includes: a primary upper coil element on a flat plate, a primary lower coil element on a flat plate located downwardly in contact with or spaced apart from the upper primary coil element, and the It is characterized in that it is configured to include a plate-shaped secondary coil element in which an induced current is generated by a current applied to the upper primary coil element and the lower primary coil element.

The planar transformer according to the present invention having the above configuration has the following effects.

First, by separating the primary coil element into a primary upper coil element and a primary lower coil element, the area in which the primary coil element 100 is in close contact with the secondary coil element 200 is increased to reduce leakage. And there is an effect that can further increase the efficiency.

Second, by alternately arranging the primary and secondary coil elements (in a zigzag manner), the leakage magnetic field can be remarkably reduced, so that the efficiency from the primary coil element to the secondary coil element can be improved. have.

Third, there is an effect of lowering the height of the product [transformer] and thinning the thickness by composing the primary coil element by winding the insulation coated wire.

Fourth, there is an effect of improving the wire connection workability by making the wire connection work of connecting the primary side coil element composed of a wire wound type to the primary side terminal pins simple and convenient.

Fifth, by implementing the coil element on the primary side so that the insulating coated wires are in contact with each other and wound in a flat shape, unlike the conventional PCB substrate type primary coil element, the resistance is lowered to reduce heat generation (excellent heat generation characteristics), and There is an effect that the transfer efficiency to the secondary coil element can be improved.

Sixth, there is an effect of reducing the size of the primary coil element itself by manufacturing the primary coil element in a flat plate shape with an air core without using a bobbin.

Seventh, a product that is a problem of the conventional "PCB type primary coil device" as a substitute or substitute for the transformer primary coil device (so-called "PCB type primary coil device") implemented on the conventional PCB board. It has the effect of solving the fact that the manufacturing cost of the product is high, the manufacturing time is long and the development period is long, it is not easy to cope with the design tuning, and the volume of the product increases when the number of turns of the coil increases. .

Eighth, by inserting the primary coil element between the inner protrusion and the outer protrusion, there is an effect of preventing the flow or gap of the primary coil element and enabling stable mounting.

Ninth, by inserting the secondary coil element between the two upper and lower primary coil elements and the lower primary coil element, there is an effect that the generation of a loss magnetic field is reduced and the efficiency from the primary side to the secondary side can be increased. .

Tenth, there is an effect of further narrowing the distance between the primary coil element and the secondary coil element by bending the two connecting portions inward in a U shape.

Eleventh, by connecting the upper coil element on the primary side and the lower coil element on the primary side in series by the configuration of a connection pin made of metal, there is an effect that makes the connection of two separated primary coil elements simple, easy and reliable. have.

Twelfth, there is an effect that can cope with various design environments by configuring the primary coil element into a mixed type of a wire wound type formed by winding an insulating coated wire and a PCB substrate type implemented on a PCB substrate.

Thirteenth, since the primary coil element is composed of an alpha coil, the wiring work is facilitated and there is an effect that the thickness of the product can be made relatively thin since there is no need to cross the coil to connect.

1 is a conceptual diagram of a configuration of an upper primary coil element 110 and a lower primary coil element 120 in a flat plate transformer according to an embodiment of the present invention.
FIG. 2 is a conceptual diagram illustrating a separate configuration of the lower primary coil element 120 in FIG. 1.
FIG. 3 is a conceptual diagram showing a separate configuration of a modified embodiment of the upper and lower coil elements 110 and 120 on the primary side in FIG. 1.
4 is a conceptual diagram showing a separate configuration of another modified embodiment of a primary coil element 100 in a flat-panel transformer according to an embodiment of the present invention.
5 is a perspective view of a planar transformer according to the first embodiment of the present invention.
6 is a perspective view of a state in which the upper cover 310 is separated from FIG. 5.
7 is a bottom perspective view of a planar transformer according to a first embodiment of the present invention.
8 is a cross-sectional view in the front-rear direction of FIG. 1.
9 is a perspective view illustrating a state in which the main part of the flat plate transformer according to the first embodiment of the present invention is separated.
10 is a perspective view of a secondary coil element 200 in an unfolded state in the planar transformer according to the first embodiment of the present invention.
11 is a plan view showing a state in which the first coil body 210 and the second coil body 220 are unfolded in the planar transformer according to the first embodiment of the present invention.
12 is a perspective view of a first coil 211 and a second coil 221 in the planar transformer according to the first embodiment of the present invention.
13 is an exploded perspective view of a planar transformer according to a second embodiment of the present invention.
14 is a cross-sectional view of a planar transformer according to the first embodiment of the present invention.
FIG. 15 is a perspective view of a secondary coil element 200 in an unfolded state in the flat-panel transformer according to the second embodiment of the present invention, and FIG. 15 is a plan perspective view and FIG. 15(b) is a bottom perspective view.
16 is a perspective view of a secondary coil element 200 in a state in which the first coil body 210 and the second coil body 220 are unfolded according to a modified embodiment of the secondary coil element 200 in the planar transformer according to an embodiment of the present invention.
17 is an exemplary photograph of an alpha coil that can be configured as a primary coil element in a planar transformer according to an embodiment of the present invention.
18 is a cross-sectional view showing a main part of the alpha coil disclosed in FIG. 17.

The following will be described in detail with reference to the accompanying drawings a preferred embodiment of the present inventors of the planar transformer.

The flat-panel transformer according to the present invention is a transformer mounted on a main PCB of a charger or adapter and used for a charger or adapter.

A flat-plate transformer according to an embodiment of the present invention includes a primary-side upper coil element 110 on a flat plate, and a primary-side lower coil on a flat plate located downwardly in contact with or spaced apart from the primary-side upper coil element 110. The element 120 and the primary side upper coil element 110 and the primary side lower coil element 120 is configured to include a plate-shaped secondary coil element 200 in which an induced current is generated. It is characterized.

In addition, it is preferable that the primary upper coil element 110 and the primary lower coil element 120 are connected in series.

According to this, there is an advantage in that the height of the product [transformer] can be lowered and the size of the product can be reduced by reducing the number of windings compared to the case where the primary coils are connected in parallel.

The primary-side upper coil element 110 and the primary-side lower coil element 120 are provided with, for example, four primary-side terminal pins (P1), and this primary-side terminal pin (P1) is a finished product on which a transformer is mounted (eg charger Or, it is connected to the main PCB (not shown) of [adapter] to supply current.

In the planar transformer according to an embodiment of the present invention, any one of the upper primary coil element 110 and the lower primary coil element 120 has an upper air core 110a formed in the center, and is insulated. It is characterized in that the coated conductive wires are formed by contacting each other and winding in a flat plate shape.

As described above, by separating the primary coil elements 110 and 120 into the primary upper coil element 110 and the primary lower coil element 120, the primary coil element 100 is in close contact with the secondary coil element 200. By increasing the area to be formed, leakage can be reduced and efficiency can be further increased.

In particular, by forming the primary coil elements 110 and 120 as an insulating coated conductive wire instead of a PCB-type coil element, for example, the primary coil element was conventionally composed of a 16 layer PCB layer and two coils of 8 layers. Since it can be composed of, there is an advantage that the manufacturing cost of the product of the primary side coil element can be reliably reduced.

Any one of the primary upper coil element 110 and the primary lower coil element 120 is composed of a wire wound coil element in which an insulating coated wire is wound in a flat plate shape, and the primary upper coil element 110 And the other one of the lower primary coil element 120 is a PCB type coil element (multilayer printed circuit board (MLB)) in which a plurality of insulating substrates (not shown) formed in a spiral shape of a metallic conductor pattern are stacked. )].

Therefore, in the case of this embodiment, the primary side coil element is composed of a hybrid type of a wire wound type coil element and a PCB type coil element.

The PCB-type coil device [multilayer printed circuit board (MLB)] itself is a known configuration prior to the filing of the present invention, so a detailed description thereof will be omitted.

The primary-side upper coil element 110 has an upper air core 110a formed in the center, and is formed by winding an insulating coated conductive wire in contact with each other to form a flat plate.

In addition, the primary-side lower coil element 120 is formed by forming a lower air core 120a communicating with the upper air core 110a in the center, and winding the insulating coated conductive wires in a flat plate shape by contacting each other. To do.

In the flat-panel transformer according to an embodiment of the present invention, the primary side upper coil element 110 and the primary side lower coil element 120 is configured to further include a connection pin (Pn) for each connection is further included, the 1 The upper coil element 110 on the vehicle side and the lower coil element on the primary side 120 are connected in series by the connection pin Pn.

Now, various embodiments of the primary coil elements 100 (110, 120) will be described.

As shown in FIG. 2, the primary lower coil element 120 is connected in series with the primary upper coil element 110, and the first air core 121a is formed in the center, and the insulating coated conductive wire The main air core coil unit 121 (main winding) formed by contacting each other and winding in a flat plate shape, and the first air core of the main air core coil unit 121 provided above or below the main air core coil unit 121 The second air core 122a is formed in the center so as to communicate with the 121a, and is formed by contacting each other with conductive wires coated with insulation and winding it in a flat plate shape, so that the main air core coil unit 121 and the induced voltage are induced by electromagnetic induction. It characterized in that it is configured to include an auxiliary coil unit 122 that generates and outputs. At this time, the primary side upper coil element 110 is composed of a main air core coil unit [main winding wire] connected in series with the main air core coil unit 121 of the primary side lower coil element 120.

In addition, the induced voltage output from the auxiliary coil unit 122 may be used to drive an IC element mounted on a main substrate (not shown).

In addition, the primary lower coil element 120 is provided in contact with the main air core coil unit 121 and has central holes 123a and 124a to communicate with the first air core 121a, and is formed in a flat plate shape. As a result, conductive shielding members 123 and 124 to shield EMI may be further included and configured.

The shielding members 123 and 124 are provided on the upper side of the main air core coil unit 121, and a central hole 123a is formed in the center to communicate with the first air core 121a, and is formed in a flat plate shape to shield EMI The conductive upper shielding member 123 is provided under the main air core coil unit 121 and has a central hole 124a formed in the center to communicate with the first air core 121a and is formed in a flat plate shape. It consists of a conductive lower shielding member 124 shielding.

At this time, the auxiliary coil unit 122 is provided in contact between the main air core coil unit 121 and the upper shield member, or is provided in contact between the main air core coil unit 121 and the lower shield member, so that the main The induced voltage is generated and output by the air core coil unit 121 and electromagnetic induction.

The upper shielding member 123 is provided on the upper side of the main air core coil unit 121, a first central hole 123a is formed in the center to communicate with the first air core 121a, and an insulation coated wire It may be composed of an upper shielding coil unit 123 that is in contact with each other and shields EMI formed by winding in a flat plate shape.

The lower shielding member 124 is provided on the lower side of the main air core coil unit 121, a second central hole 124a is formed in the center to communicate with the first air core 121a, and an insulating coated wire is formed. It may be composed of a lower shielding coil unit 124 that is in contact with each other and shields EMI formed by winding in a flat plate shape.

On the other hand, the upper shielding member and the lower shielding member may be formed by winding the insulation-coated wire into a flat plate as described above, but is not limited thereto, for example, a shielding copper foil sheet having a central hole formed in the center and shielding EMI [For example, it may be composed of a thin copper plate or copper tape [copper foil tape]], or may be composed of a shielding fiber sheet (not shown) that has a central hole and shields EMI.

In addition, the lower primary coil element 120 is provided between the main air core coil unit 121 and the upper shielding member and has an upper insulating sheet in which a through hole communicating with the first air core 121a is formed in the center ( C1), and a lower insulating sheet (C2) provided between the main air core coil unit 121 and the lower shield member and having a through hole communicating with the first air core 121a formed in the center may be further included. have.

At this time, the auxiliary coil unit 122 is provided in contact between the upper insulating sheet (C1) and the upper shielding member, or provided in contact between the lower insulating sheet (C2) and the lower shielding member, so that the main air core nose It is characterized by generating and outputting an induced voltage by the part 121 and electromagnetic induction.

According to the above configuration, the insulation breakdown voltage is further increased than in the case of laminating bonding using a bond, so that the spacing between the coil units 121, 122, 123, 124 can be further narrowed, and the size of the product can be further reduced.

In addition, the upper and lower insulating sheets (C1, C2) is characterized in that the adhesive layer is formed to facilitate coupling between the coil units (121, 122, 123, 124) stacked on the upper and lower sides. In this case, the upper and lower insulating sheets C1 and C2 may be composed of double-sided adhesive films having adhesive layers formed on the upper and lower surfaces, respectively.

In addition, depending on the embodiment, an insulating sheet (not shown) may be provided between the upper shield member 123 and the auxiliary coil unit 122.

The upper and lower insulating sheets C1 and C2 may be formed of an insulating film made of a synthetic resin material.

3 shows a modified embodiment of the primary-side coil elements 100:110,120.

As shown in FIG. 3, the primary upper coil element 110 is connected in series with the main air core coil unit 121 of the primary lower coil element 120, and the first air core 111a is formed in the center. And the main air core coil part 111 formed by winding the insulating coated conductive wires in contact with each other in a flat plate shape (should be distinguished from the main air core coil part 121 provided in the lower primary coil element 110), It is provided above or below the main air core coil part 111, and a second air core 112a is formed in the center so as to communicate with the first air core 111a of the main air core coil part 111, and is coated with insulation. It characterized in that it comprises a secondary coil unit 112 formed by winding the wires in a flat plate shape by contacting each other.

In this case, the lower primary coil element 120 may be composed of a main air core coil unit 121 connected in series with the main air core coil unit 112 of the upper primary coil element 110.

Depending on the embodiment, the upper coil element 110 on the primary side has a first central hole 123a formed in the center so as to communicate with the second air core 112a, and is formed by winding an insulating coated wire in contact with each other to form a flat plate. It may be configured to further include an upper shielding coil unit 113 to shield the EMI.

Likewise, according to the embodiment, the lower primary coil element 120 has a second central hole 124a formed in the center to communicate with the first air core 121a in addition to the main air core coil unit 121 A lower shielding coil unit 124 for shielding EMI formed by contacting the coated wires with each other and winding them in a flat plate shape may be further included.

In addition, depending on the embodiment, the upper and lower insulating sheets C1 and C2 may be provided between the coil units 111, 112 and 113, or may be additionally provided between the coil units 121 and 124.

4 shows a modified embodiment of the primary side coil elements 100:110,120 according to an embodiment of the present invention.

As shown in Fig. 4, the primary upper coil element 110 has a second air core 112a formed in the center, and is formed by winding an insulating coated conductive wire in contact with each other to form a flat plate. Consisting of including a coil unit 112, the primary lower coil element 120 has a first air core 121a formed in the center, and the insulating coated conductive wires are in contact with each other to form a flat plate. It characterized in that it is configured to include the formed main air core coil unit 121.

When the auxiliary coil unit 122 is disposed in the middle of the secondary coil element 200 as in the case of the first embodiment to be described later, the primary lower coil element 120 disposed between the secondary coil elements 210 and 220 at the lower and upper sides. ) Is thickened by the thickness of the auxiliary coil unit 122, and thus leakage increases, resulting in a problem of lowering efficiency.

Therefore, in order to solve this problem, the auxiliary coil unit 112 is separated from the main air core coil unit 121 to be provided in the primary upper coil element 110.

Depending on the embodiment, the upper coil element 110 on the primary side has a first central hole 123a formed in the center so as to communicate with the second air core 112a, and is formed by winding an insulating coated wire in contact with each other to form a flat plate. It may be configured to further include an upper shielding coil unit 113 to shield the EMI.

Depending on the embodiment, the lower primary coil element 120 has a second central hole 124a formed in the center to communicate with the first air core 121a in addition to the main air core coil unit 121 and is coated with insulation. A lower shielding coil unit 124 for shielding EMI formed by contacting wires with each other and winding in a flat plate shape may be further included.

In addition, the upper and lower insulating sheets C1 and C2 may be provided between the coil units 112 and 113, or may be additionally provided between the coil units 121 and 124.

In the planar transformer according to an embodiment of the present invention, the upper and lower coil elements 110 and 120 on the primary side are formed of an alpha coil (photo of FIG. 17).

That is, the upper coil element 110 on the primary side has an air core formed in the center, and the insulating coated conductive wires are in contact with each other to be wound in a flat plate shape, but both ends of the insulating coated wire are double wound in different directions. Thus, it is composed of an alpha coil wound in a flat plate shape.

In addition, the lower coil element 120 of the primary side has an air core formed in the center, and the insulating coated conductive wires are in contact with each other to be wound in a flat plate shape, and both ends of the insulating coated wire are double wound in different directions. It is characterized by consisting of an alpha coil wound in a flat plate shape.

As described above, since the alpha coil uses the same number of windings, it can be evenly aligned, and since the windings are evenly aligned, the thickness of the winding can be reduced and EMI characteristics can be improved much better.

In the flat-panel transformer according to an embodiment of the present invention, a primary-side terminal pin (P1) for connecting with the primary-side upper coil element 110 and the primary-side lower coil element 120 is provided, and the primary-side terminal The primary terminal block 240 for installing the pin P1 is formed on one of the following first coil body 210 or second coil body 220.

The primary-side terminal block 240 has a wire passage groove 240a for passing the wire to connect the wire with the primary-side terminal pin P1.

In addition, each of the first terminal (211a) of the first coil body and the second terminal (221a) of the second coil body are connected to the main PCB (not shown) of the finished product (eg, charger or adapter) on which the transformer is mounted. A secondary terminal pin (P2) is provided.

In the flat-plate transformer according to an embodiment of the present invention, the secondary coil element 200 includes a molding resin in a state in which the secondary coils 211 and 221 are inserted into a cavity (not shown) of an injection mold (not shown). It is preferable that it is formed by insert molding in which the secondary coils 211 and 221 are embedded at the same time as the insulating portions 212 and 222 are formed by injecting.

The secondary coils 211 and 221 include coil pattern portions 211b and 221b formed in a flat spiral pattern, and connection portions 211c and 221c that are bent in a U shape at one end of the coil pattern portions 211b and 221b. And, terminals 211a and 221a formed at ends of the connection parts 211c and 221c, and the connection parts 211c and 221c are bent inward from one end of the coil pattern parts 211b and 221b. Later, it is bent in a U-shape that is bent back (the direction in which the terminal is located), and the upper surface 212b and the lower surface 220c of the secondary coil element 200 are formed in a flat shape without protrusions.

As described above, by bending the connection portions 211c and 221c in a U-shape and forming the upper surface 212b and the lower surface 220c of the secondary coil element 200 in a flat shape without protrusions, the primary coil elements 110 and 120 And the secondary coil element 200 can be in close contact with the surface contact, and as a result, the distance between the primary coil elements 110 and 120 and the secondary coil element 200 is very narrow, so that the magnetic coupling force is excellent and the height of the product There is an advantage of being lowered.

In addition, the insulating parts 212 and 222 are formed to contain the coils 211 and 212 of the secondary coil element except for the terminals 211a and 221a.

The secondary coil element 200 is composed of a first coil body 210 and a second coil body 220 spaced downward from the first coil body 210, and the first coil body 210 And a specific configuration of the second coil body 220 will be described.

The first coil body 210 is bent downward at one end of the first coil pattern part 211b formed in a flat spiral pattern and the first coil pattern part 211b, and then bent backward. A first coil 211 composed of a first connection part 211c bent in a shape, a first terminal 211a formed at the end of the first connection part 211c, and a first central through hole 210a in the center It is configured to include a first insulating portion 212 made of a synthetic resin material containing the first coil 211 except for the first terminal 211a so as to be formed.

The second coil body 220 is bent upward at one end of the second coil pattern part 221b formed in a flat spiral pattern and the second coil pattern part 221b, and then bent backward. A second coil 221 composed of a second connection part 221c bent in a shape, a second terminal 221a formed at the end of the second connection part 221c, and a second central through hole 220a in the center It is characterized in that it is configured to include a second insulating portion 212 made of a synthetic resin material containing the second coil 221 excluding the second terminal 221a so as to be formed.

The first connection portion 211c that is U-bend downward and the second connection portion 221c that is U-bend upward are U-bend so as not to overlap each other. Accordingly, there is an advantage in that the thickness of the secondary coil element 200 can be reduced.

The first connection part 211c is U-bent downward and then rearwardly bent in an oblique line, and the second connection part 221c is formed U-bending backward, so that the first connection 211c and the second connection 221c do not overlap It is characterized in that it is formed so as not to.

According to this, there is an advantage that the first connection portion 211c and the second connection portion 221c can be manufactured so that they do not overlap each other even in a small area.

Next, as shown in FIGS. 5 to 12, the configuration and operation peculiar to the planar transformer according to the first embodiment of the present invention will be described.

As shown in Figs. 5 to 12, the planar transformer according to the first embodiment of the present invention is composed of a primary coil element and a secondary coil element arranged in a zigzag manner.

In the flat-panel transformer according to the first embodiment of the present invention, the primary lower coil element 120 is located downwardly from the primary upper coil element 110 so that it is located between the upper primary coil element 110 and the upper coil element 110 on the primary side. The insertion space (S1) is formed in, and the secondary coil element 200 includes a first coil body 210 and a second coil body 220 spaced apart from the first coil body 210 And any one of the first coil body 210 and the second coil body 220 of the secondary coil element 200 is inserted into the insertion space S1, The primary side upper and lower coil elements 110 and 120 and the secondary side coil elements 200 are provided so as to be alternately positioned (zigzag) with respect to the vertical direction [vertical direction].

The "alternately provided" means that one of the primary upper coil element 110 and the primary lower coil element 120 is the one of the first coil body 210 and the second coil body 220 facing each other. It is provided between, and the other means is disposed on the upper surface of the first coil body 210 or the lower surface of the second coil body 220.

For example, in the direction from the top to the bottom, the primary upper coil element 110, the first coil element 210, the lower primary coil element 120, and the second coil element 220 are arranged in the order (Fig. 5). To FIG. 12], or the first coil body 210, the upper primary coil element 110, the second coil body 220, and the lower primary coil element 120 in that order.

According to the configuration in which the upper and lower coil elements 110 and 120 on the primary side and the coil elements 200 on the secondary side are alternately arranged as described above, the generation of the loss magnetic field is remarkably reduced and the efficiency from the primary side to the secondary side is remarkably increased. There is an advantage.

If the primary coil element is disposed between the upper and lower sides of the secondary coil element as in the prior art, the two sides of the secondary coil element (a total of four sides of the secondary coil element, that is, the upper and lower two sides and The primary coil is in contact with a total of two faces, one of the top and bottom of the bottom and one of the top and bottom of the bottom), but if the primary coil element and the secondary coil element are arranged in zigzag as above, three sides The primary coil element comes into contact with it.

That is, as in the prior art, two surfaces are in contact with the middle of the secondary coil, and one surface is additionally in contact with the outer side of the upper or lower side of the secondary coil, so that a total of three surfaces are in contact.

In this way, when the three surfaces are in contact, the area of contact between the primary coil element and the secondary coil element is relatively increased, so that leakage can be further reduced and efficiency is improved.

In the planar transformer according to the first embodiment of the present invention, it is formed on at least one of the first coil body 210 or the second coil body 220 so that the primary upper coil element 110 and the primary lower It is characterized in that it is configured to further include holding members (231, 232, 233, 234) for holding the coil element 120.

The holding members 231, 232, 233, and 234 are formed to protrude outward from one surface (for example, the upper surface or the lower surface) of the first coil body 210 and the second coil body 220, so that the primary upper coil element 110 and the primary lower Holds the coil element 120.

In the flat-panel transformer according to the first embodiment of the present invention, the holding member 231, 232, 233, 234 is one of the upper or lower surfaces of the first coil body 210 (in the illustrated example, the upper surface) in a vertical direction (for example, The first holding members 231 and 232 for holding the upper coil element 110 on the primary side so as to be formed protruding upward) and provided without separation or gap, and a first holding member 231 and 232 for holding the upper coil element 110 on the primary side, 1 A second holding member 233, 234 for holding the lower primary coil element 120 is formed to protrude in one (for example, upward) in a vertical direction that is the same protruding direction as the holding members 231 and 232 so that there is no separation or gap. It characterized in that it is configured to include.

Meanwhile, the first holding members 231 and 232 for holding the primary upper coil element 110 by protruding downward from the lower surface of the first coil body 210 and the lower surface of the second coil body 220 It may be formed of lower holding members 233 and 234 for holding the primary lower coil element 120 by protruding downward. This embodiment includes the first and second coil bodies 210 and 220 disclosed in FIGS. 5 to 12. Since the configuration is the same as in the case of upside down, it goes without saying that this case is also included in the technical scope of the present invention.

That is, when the upper primary coil element 110 and the lower primary coil element 120 are positioned above the first coil body 210 and the second coil body 220 and are alternately provided, It is formed to protrude upward, and the primary upper coil element 110 and the primary lower coil element 120 are positioned under the first coil body 210 and the second coil body 220 so that they are alternately provided If it is formed protruding downward from the lower surface, in any case falls within the technical scope of the present invention.

The first holding members 231 and 232 are formed to protrude from one surface (eg, upper surface 210b) of the first coil body 210 in a vertical direction (eg, upward), and the primary side of the upper coil element 110 A first inner protrusion 231 that contacts the inner circumferential surface of the upper air core 110a to hold the inner circumferential surface of the upper air core 110a of the primary upper coil element 110, and the first inner protrusion 231 in a horizontal direction. It is spaced outwardly and protrudes from one surface (eg, upper surface 210b) of the first coil body 210 in a vertical direction (eg, upward) in the same direction as the protruding direction of the first inner protrusion 231, 1 It includes a first outer protrusion 232 that contacts the outer peripheral surface 110b of the upper coil element 110 on the vehicle side and holds the outer peripheral surface 110b of the upper coil element 110 on the primary side.

The second holding members 233 and 234 are formed to protrude from one side (eg, upper surface 222b) of the second coil body 220 in a vertical direction (eg, upward), and the lower coil element 120 of the primary side A second inner protrusion 233 that contacts the inner circumferential surface of the lower air core 120a to hold the inner circumferential surface of the lower air core 120a of the primary lower coil element 120, and the second inner protrusion 233 in a horizontal direction. It is spaced outwardly and protrudes from one surface (eg, upper surface 222b) of the second coil body 220 in a vertical direction (eg, upward) in the same direction as the protruding direction of the first inner protrusion 231, 1 It includes a second outer protrusion 234 that contacts the outer peripheral surface 120b of the lower coil element 120 on the vehicle side and holds the outer peripheral surface 120b of the lower coil element 120 on the primary side.

The primary upper coil element 110 is mounted on the upper surface 212b of the first coil body 210, and the primary lower coil element 120 is the upper surface 222b of the second coil body 220 To be wit

In addition, the first inner protrusion 231 is formed to protrude from an upper surface 212b (that is, the upper surface 212b of the first coil body) of the first insulating part 212, and the primary upper coil element 110 ) To hold the inner circumferential surface of the upper air core 110a of the primary upper coil element 110 by contacting the inner circumferential surface 110a' of the upper air core 110a.

The first outer protrusion 232 is spaced outwardly from the first inner protrusion 231 and protrudes from the upper surface of the first insulating part 212, and is formed on the outer peripheral surface 120b of the lower primary coil element 120. By contacting, the outer peripheral surface 120b of the lower primary coil element 120 is held.

In the flat-panel transformer according to the first embodiment of the present invention, in order to connect the wires of the upper primary coil element 110 and the lower primary coil element 120 to the primary terminal pin (P1), the first nose Wire insertion channels 251 and 252 for guiding a wire from the first central hole 210a of the unit 210 or the second central hole 220a of the second coil body 220 to the primary terminal block 240 It is characterized in that the indentation is formed.

In addition, the wire of the main air core coil unit 121 is terminated from the inner side of the main air core coil unit 121 and is connected to the primary terminal pin P1. ) And connected to the primary terminal pin (P1).

The wire of the auxiliary coil unit 122, which is terminated from the inside of the auxiliary coil unit 122 and is connected to the primary terminal pin P1, is inserted into the wire insertion channels 251 and 252 along the wire insertion channels 251 and 252. It characterized in that it is connected to the primary terminal pin (P1).

In addition, the inner protrusion 231 has passage slits 261 and 262 formed to communicate with the wire insertion channels 251 and 252, and the wire of the main air core coil unit 121 and the wire of the auxiliary coil unit 122 are the It is characterized in that it is inserted into the through slit (261, 262) and inserted into the wire insertion channels (251, 252) to be connected.

The through slits 261 and 262 may be formed as a pair for inserting the wires of the main air core coil unit 121 and the wires of the auxiliary coil unit 122, respectively.

In the flat-plate transformer according to the first embodiment of the present invention, a central hole 310a is formed, and is held by the first holding members 231 and 232 to be seated on one surface of the first coil body 210. An upper cover 310 coupled to the first coil body 210 to cover (cover) the upper coil element 110 on the vehicle side is further included and configured.

Accordingly, it is possible to mount the primary upper coil element 110 in the space formed by the first inner protrusion 231, the first outer protrusion 232, and the upper cover 310, so that it can be mounted more stably. .

In addition, a first fastening protrusion 215 is formed on one surface of the first coil body 210, and a first fastening hole 310b fastened to the first fastening protrusion 215 in the upper cover 310 In this form, the upper cover 310 is coupled to one surface of the first coil body 210.

The method of fastening the upper cover 310 is not limited to the above configuration, and may be fastened by, for example, an adhesive method or a taping method.

The following describes the configuration and operation of the flat plate transformer according to the second embodiment of the present invention shown in FIGS. 13 to 16.

As shown in Figs. 13 to 16, the planar transformer according to the second embodiment of the present invention has a main point that a secondary coil element is inserted between the primary coil elements.

In the flat-panel transformer according to the second embodiment of the present invention, the lower primary coil element 120 is located downwardly from the upper primary coil element 110, so that it is located between the upper primary coil element 110 and the upper coil element 110 on the primary side. In the insertion space (S1) is formed, and the secondary coil element 200 is inserted into the insertion space (S1) formed between the upper primary coil element 110 and the lower primary coil element 120 It characterized in that it is provided.

According to the configuration of inserting the secondary coil element 200 between the two upper and lower primary coil elements 110 and the lower primary coil element 120 as described above, the conventional technique, that is, two Compared to the technique of configuring one primary coil element between the secondary coil elements, there is an advantage in that the generation of a loss magnetic field is reduced and the efficiency from the primary side to the secondary side is increased.

The secondary coil element 200 includes secondary coils 211 and 221 of a conductive material formed in a helical pattern in a flat plate shape, and the secondary coils 211 and 221 so that central through holes 210a and 220a are formed in the center. Consisting of including insulating portions 212 and 222 made of synthetic resin formed in a flat plate shape, the upper surface 212b of the secondary coil element 200 is in contact with the primary upper coil element 110, and the secondary coil The lower surface 222c of the element 200 is in contact with the lower primary coil element 120, so that the secondary coil element 200 is the upper primary coil element 110 and the lower primary coil element 120. It characterized in that it is provided to be inserted into the insertion space (S1) of. According to this, there is an advantage that the coupling force between the primary side and the secondary side is increased.

The secondary coil element 200 may be composed of one secondary coil element 210 (or secondary coil element 220), or may be composed of two secondary coil elements 210 and 220, which It is determined by design specifications according to the output of the transformer, and in any case falls within the technical scope of the present invention. Further, depending on the design specification, three or more secondary coil elements 210 and 220 may be configured, and even in this case, it goes without saying that they belong to the technical scope of the present invention.

In the flat-panel transformer according to an embodiment of the present invention, a case where the secondary coil element 200 is composed of two will be described in detail.

The primary upper coil element 110 is mounted on the upper surface 212b of the first coil body 210, and the lower surface 222c of the second coil body 220 is formed of the lower primary coil element 120. The upper side is brought into close contact.

A holding member formed on at least one surface of the upper surface 212b or the lower surface 222c of the secondary coil element 200 to hold the upper primary coil element 110 and the lower primary coil element 120 ( 235,236,237,238), characterized in that the flat-panel transformer is configured to include.

The holding members 235,236,237,238 are formed to protrude upward from the upper surface 212b of the first coil body 210, and protrude downward from the lower surface of the second coil body 220, so that the primary upper coil element ( 110) and the lower coil element 120 on the primary side.

The holding members 235,236,237,238 are formed to protrude upward from the upper surface of the first coil body 210 so that there is no separation or gap, and a first holding member (235,236) for holding the primary upper coil element 110 Wow, from the lower surface of the second coil body 220 is formed to protrude downward in a protruding direction opposite to the first holding members 235 and 236 to hold the lower primary coil element 120 so as to be provided without separation or gap. It is characterized in that it comprises a second holding member (237,238).

The first holding members 235 and 236 are formed to protrude upward from the upper surface of the first coil body 210 and contact the inner circumferential surface of the upper air core 110a of the upper primary coil element 110 to The first inner protrusion 235 that holds the inner circumferential surface of the upper air core 110a of the coil element 110 and the first inner protrusion 235 are spaced outward in the horizontal direction, so that the first coil body 210 Consists of including a first outer protrusion 236 that protrudes upward from the upper surface and contacts the outer peripheral surface 110b of the primary upper coil element 110 to hold the outer peripheral surface 110b of the primary upper coil element 110 do.

Conversely, the second holding members 237 and 238 are formed to protrude from the other surface of the second coil body 220 (for example, the lower surface 222c) to the other (for example, downward) in the vertical direction, and the lower coil element 120 on the primary side ) In contact with the inner circumferential surface of the lower air core 120a to hold the inner circumferential surface of the lower air core 120a of the primary lower coil element 120, and the second inner protrusion 237 horizontally. It is spaced in the outward direction of the second coil body 220 so as to protrude from one surface (for example, the lower surface 222c) of the second coil body 220 to the other (for example, downward) in the same direction as the protruding direction of the second inner protrusion 237 , It is characterized in that it comprises a second outer protrusion 238 that contacts the outer peripheral surface 120b of the lower primary coil element 120 and holds the outer peripheral surface 120b of the lower primary coil element 120.

Meanwhile, as shown in FIG. 16, in a transformer according to another embodiment of the present invention, a second receiving groove 227 for accommodating the first connecting part 211c is formed of the second coil body 220. The first receiving groove 217 for accommodating the second connection portion 221c is formed in the upper surface 222b, and the first receiving groove 217 is formed in the lower surface 212c of the first coil body 210, and the first nose It is characterized in that the lower surface 212c of the integral 210 and the upper surface 222b of the second coil body 220 may be in surface contact so as to be in close contact. Accordingly, the thickness of the secondary coil element 200 can be made thin.

And, the first coil body 210 to cover (cover) the primary upper coil element 110 that is held by the first holding members 235 and 236 and seated on one surface of the first coil body 210 It is the same as the above-described first embodiment that the upper cover 310 is further included.

And, in the case of the second embodiment, a central hole (320a) is formed, the lower primary side coil element 120 that is held by the second holding members 237 and 238 to be seated on one surface of the second coil body 220 ) To cover (to cover) a lower cover 320 coupled to the second coil body 220 is further included.

A second fastening protrusion 225 is formed on one surface of the second coil body 220, and a second fastening hole 320b fastened to the second fastening protrusion 225 is formed in the lower cover 320 In this way, the lower cover 320 is coupled to one surface of the second coil body 220.

On the other hand, in the transformer according to another embodiment of the present invention, the cross section of the wire of the upper primary coil element 110 and the lower primary coil element 120 is characterized in that the square shape. According to this, there is an advantage in that the efficiency is increased because the wires are concentrated.

In addition, the first coil body 210 and the second coil body 220 may be connected in series as shown. When connected in series, a bridge (Br) is further included and configured.

Meanwhile, a bridge (Br) for electrically connecting the first coil pattern portion 212 and the second coil pattern portion 222 may be further included, and the first coil body ( 210) and the second coil body 220 are configured in series.

In the illustrated embodiment, the first coil body 210 and the second coil body 220 are connected by a bridge (Br) to be serially configured, but the present invention is not limited thereto. Even when the integral 210 and the second coil body 220 are configured in parallel without connection, they belong to the technical scope of the present invention.

As described above, preferred embodiments according to the present invention have been examined, and it is common knowledge in the relevant technical field that the present invention can be implemented in other specific forms without changing the technical spirit or essential features other than the above-described embodiments. It is self-evident to those who have. Therefore, the above-described embodiments should be understood as illustrative rather than restrictive.

The scope of the present invention is indicated by the claims to be described later rather than the detailed description, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention.

100: primary coil element
110: primary upper coil element 110a: upper air core
110a': inner peripheral surface of the upper coil element on the primary side
110b: outer peripheral surface of the lower primary coil element
120: primary lower coil element 120a: lower air core
120a': inner peripheral surface of the upper coil element on the primary side
120b: outer peripheral surface of the lower coil element on the primary side
Pn: Connection pin S1: Insertion space
111,121: main air core coil unit 111a,121a: first air core
C1: upper insulating sheet C2: lower insulating sheet
112,122: auxiliary coil unit 112a,122a: second air core
123: upper shielding coil part 123a: first central hole
124: lower shielding coil part 124a: second central hole
200: secondary coil element 210: first coil body
210: first coil body 211: first flat coil
211a: first terminal 211b: first coil pattern portion
211c: first connection part 210a: first central hole
212: first insulating part 212b: upper surface of the first coil body
212c: lower surface of the first coil body 215: first fastening protrusion
217: first receiving groove Br: bridge
220: second coil body 221: second flat coil
221a: second terminal 221b: second coil pattern part
221c: second connection part 220a: second central hole
222: second insulating part 222b: upper surface of the second coil body
222c: lower surface of the second coil body 225: second fastening protrusion
227: second receiving groove 231: first inner protrusion
232: first outer protrusion 233: second inner protrusion
234: second outer protrusion 235: first inner protrusion
236: first outer protrusion 237: second inner protrusion
238: second outer protrusion P1: primary terminal pin
P2: secondary terminal pin 240: primary terminal block
240a: wire through groove 251,252: wire insertion channel
261,262: through slit 310: top cover
310a: central hole 310b: first fastening hole
320: lower cover 320a: central hole
320b: second fastening hole

Claims (5)

A flat plate-shaped primary upper coil element 110,
A flat plate-shaped primary lower coil element 120 positioned to be in contact with or spaced apart from the primary upper coil element 110,
A planar transformer comprising: a plate-shaped secondary coil element 200 in which an induced current is generated by a current applied to the primary upper coil element 110 and the primary lower coil element 120 .
The method according to claim 1,
The primary upper coil element 110,
The upper air core (110a) is formed in the center, is formed by contacting each other conductive wires coated with insulation and winding in a flat plate shape,
The primary lower coil element 120,
A plate-type transformer, characterized in that a lower air core (120a) communicating with the upper air core (110a) is formed in the center, and the insulating coated conductive wires are in contact with each other to form a flat plate shape.
The method according to claim 1,
The primary lower coil element 120,
The main air core coil unit 121 is connected in series with the primary upper coil element 110, the first air core 121a is formed in the center, and is formed by winding the insulating coated conductive wires in a flat plate shape by contacting each other Wow,
It is provided above or below the main air core coil unit 121, a second air core 122a is formed in the center so as to communicate with the first air core 121a of the main air core coil unit 121, and is coated with insulation. A planar transformer comprising an auxiliary coil unit 122 formed by contacting conductive wires with each other and winding in a planar shape.
The method of claim 3,
The primary lower coil element 120,
It is provided in contact with the main air core coil unit 121 and has central holes 123a and 124a to communicate with the first air core 121a, and is formed in a flat plate shape to shield EMI Flat-panel transformer, characterized in that the configuration is further included.
The method of claim 3,
The primary terminal block 240 provided with the primary terminal pin P1 is formed on either the first coil body 210 or the second coil body 220,
In order to connect the wires of the upper primary coil element 110 and the lower primary coil element 120 with the primary terminal pin (P1),
A wire insertion channel for guiding a wire from the first central hole 210a of the first coil body 210 or the second central hole 220a of the second coil body 220 to the primary terminal block 240 ( 251,252) is a flat plate type transformer, characterized in that the concave formed.

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