KR102500130B1 - A planar transformer - Google Patents

Abstract

The present invention relates to a planar transformer, and according to the present invention, a flat primary side upper coil element 110 and a flat primary side contacting downward or spaced apart from the primary upper coil element 110 Consists of a lower coil element 120, a flat-plate 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 Characterized in that, according to this, there is an advantage that the generation of the loss magnetic field is reduced and the efficiency from the primary side to the secondary side is increased.

Description

Planar Transformer {A PLANAR TRANSFORMER}

The present invention relates to a transformer, and more particularly to a flat plate transformer used in a charger or adapter.

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

Among the transformers, a technology proposed in relation to a small transformer used in a mobile phone charger, etc., is disclosed as "transformer" by Registration Patent No. 10-1579427 (announcement date: December 22, 2015).

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

Such a conventional PCB type primary coil element is manufactured by coating an insulating substrate with copper foil 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 is a problem of generation of a magnetic loss 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 side coil element is separated from the top and bottom.

In addition, since the PCB type primary coil element according to the prior art forms a circuit pattern on the PCB substrate, the manufacturing period is basically long, so there is a problem that it is not suitable for short delivery period manufacturing. In addition, since the PCB-type primary coil element is basically patterned on the PCB substrate, there is a problem in that it is difficult to cope with design diversification (product tuning).

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

Document 1: Registered Patent Publication No. 10-1579427 (Public date: 2015. 12. 22.) Document 2: Patent Publication No. 10-2016-0041837 (published date: 2016.04.18.)

The present invention was created to solve the above problems of the prior art, and the purpose of the planar transformer according to the present invention is,

First, by separating the primary-side coil element into a primary-side upper coil element and a primary-side lower coil element, the area where the primary-side coil element 100 is in close contact with the secondary-side coil element 200 is widened to reduce leakage. and to increase efficiency,

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

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

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

Fifth, by implementing the primary coil element so that the insulated wires are wound in a flat plate shape while contacting each other, the resistance is lowered and the heat generation is reduced (excellent heat generation characteristics), unlike the conventional primary coil element of the PCB board type, and To improve the transfer efficiency to the secondary side coil element,

Sixth, the size of the primary coil element itself can be reduced by manufacturing the primary coil element in an air-core flat plate type without using a bobbin,

Seventh, a product that is a problem of the conventional "PCB type primary coil device" as it is intended to replace or substitute for the primary coil element for transformers implemented on the conventional PCB board (so-called "PCB type primary coil element"). It is possible to solve the problem of high production cost, long production time and long development period, difficulty in coping with design tuning, and increased volume of the product when the number of coil turns is large,

Eighth, by inserting the primary coil element between the inner protrusion and the outer protrusion, the movement or clearance of the primary coil element can be prevented and stable mounting can be performed.

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

Tenth, by bending the two connection parts inwardly in a U shape, the distance between the primary coil element and the secondary coil element can be further narrowed,

Eleventh, by connecting the primary-side upper coil element and the primary-side lower coil element in series by the configuration of the connection pin made of metal material, the connection of the two spaced primary-side coil elements can be simply, easily, and reliably,

Twelfth, the primary side coil element is composed of a mixed type of a wire winding type configured by winding an insulating coated wire and a PCB substrate type implemented on a PCB board so that it can respond to various design environments,

Thirteenth, by configuring the primary side coil element with an alpha coil, it is easy to do the wiring work, and it is not necessary to cross the coil and do not have to wire it, so that the thickness of the product can be relatively thin. .

A planar transformer of the present invention for achieving the above object is a flat primary upper coil element, a flat primary lower coil element contacting downward or spaced apart from the primary upper coil element, and It is characterized in that it comprises a flat-plate secondary coil element in which an induced current is generated by a current applied to the primary-side upper coil element and the primary-side lower coil element.

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

First, by separating the primary-side coil element into a primary-side upper coil element and a primary-side lower coil element, the area where the primary-side coil element 100 is in close contact with the secondary-side coil element 200 is widened to reduce leakage. It has the effect of increasing efficiency.

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

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

Fourth, it is possible to simply and conveniently perform a wire connection work for connecting a primary coil element configured in a wire wound type to a primary terminal pin, thereby improving wire connection workability.

Fifth, by implementing the primary coil element so that the insulated wires are wound in a flat plate shape while contacting each other, the resistance is lowered and the heat generation is reduced (excellent heat generation characteristics), unlike the conventional primary coil element of the PCB board type, and There is an effect that the transmission efficiency to the secondary side coil element can be improved.

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

Seventh, a product that is a problem of the conventional "PCB type primary coil device" as it is intended to replace or substitute for the primary coil element for transformers implemented on the conventional PCB board (so-called "PCB type primary coil element"). It has the effect of solving the high manufacturing cost, the long production time and long development period, the difficulty in coping with design tuning, and the increase in the volume of the product when the number of turns of the coil is large. .

Eighth, by inserting the primary side coil element between the inner protrusion and the outer protrusion, there is an effect of preventing movement or clearance of the primary side 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, the generation of loss magnetic field is reduced and the efficiency from the primary side to the secondary side can be increased. .

Tenth, the distance between the primary coil element and the secondary coil element can be further narrowed by forming the two connection parts inwardly bent in a U shape.

Eleventh, by connecting the primary-side upper coil element and the primary-side lower coil element in series by the configuration of the connection pin made of metal, there is an effect of enabling simple, easy, and reliable connection of the two spaced primary-side coil elements. there is.

Twelfth, by configuring the primary-side coil element in a mixed type of a wire winding type configured by winding an insulating coated wire and a PCB substrate type implemented on a PCB substrate, there is an effect of responding to various design environments.

Thirteenth, by configuring the primary side coil element as an alpha coil, the wiring work is facilitated, and the thickness of the product can be relatively thin because there is no need to cross the coil and wire it.

1 is a conceptual diagram showing the configuration of a primary-side upper coil element 110 and a primary-side lower coil element 120 in a planar transformer according to an embodiment of the present invention.
FIG. 2 is a conceptual diagram illustrating the separation of the primary-side lower coil element 120 in FIG. 1 .
FIG. 3 is a conceptual diagram illustrating a separated configuration of the primary upper and lower coil elements 110 and 120 in FIG. 1 according to a modified embodiment.
FIG. 4 is a conceptual diagram illustrating a separated configuration of another modified embodiment of a primary coil element 100 in a planar transformer according to an embodiment of the present invention.
5 is a perspective view of a planar transformer according to a first embodiment of the present invention.
FIG. 6 is a perspective view of a state in which the upper cover 310 is separated in FIG. 5 .
7 is a bottom perspective view of a planar transformer according to a first embodiment of the present invention.
Fig. 8 is a cross-sectional view of Fig. 1 in the front and rear direction;
9 is a perspective view of a state in which the main parts of the planar transformer according to the first embodiment of the present invention are separated.
10 is a perspective view of a secondary coil element 200 in an unfolded state in a planar transformer according to the first embodiment of the present invention.
11 is a plan view of a first coil body 210 and a second coil body 220 in an unfolded state in the planar transformer according to the first embodiment of the present invention.
12 is a perspective view of the first coil 211 and the 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 a first embodiment of the present invention.
FIG. 15 is a perspective view of a secondary side coil element 200 in an unfolded state in a planar transformer according to a second embodiment of the present invention. FIG. 15 is a planar perspective view and FIG. 15 (b) is a bottom perspective view.
16 is a perspective view of a first coil unit 210 and a second coil unit 220 of a modified embodiment of a secondary side coil element 200 in a planar transformer according to an embodiment of the present invention in an unfolded state.
17 is an example photo of an alpha coil that can be configured as a primary side coil element in a planar transformer according to an embodiment of the present invention.
FIG. 18 is a cross-sectional view of the main part of the alpha coil shown in FIG. 17;

Next, with reference to the accompanying drawings, a preferred embodiment of the planar transformer of the present invention will be described in detail.

The planar 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 flat primary upper coil element 110 and a flat primary lower coil that contacts or is spaced downward from the primary upper coil element 110. element 120, and a plate-shaped secondary coil element 200 in which an induced current is generated by the current applied to the primary upper coil element 110 and the primary lower coil element 120. to be characterized

Also, it is preferable that the primary-side upper coil element 110 and the primary-side lower coil element 120 are connected in series.

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

The primary-side upper coil element 110 and the primary-side lower coil element 120, for example, are provided with four primary-side terminal pins (P1). or adapter] is connected to the main PCB (not shown) to supply current.

In the planar transformer according to an embodiment of the present invention, in one of the primary-side upper coil element 110 and the primary-side lower coil element 120, an upper air core 110a is formed in the center and is insulated. It is characterized in that it is formed by winding coated conductive wires in contact with each other in a flat 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 adheres closely to the secondary coil element 200. It has the effect of reducing leakage and increasing efficiency by increasing the area to be covered.

In particular, by forming the primary-side coil elements 110 and 120 as conductive wires coated with insulation rather than PCB-type coil elements, for example, the primary-side coil elements conventionally composed of 16-layer PCB layers are replaced with two coils of 8 layers. Since it can be configured, there is an advantage in that the manufacturing cost of the product of the primary side coil element can be surely reduced.

One of the primary-side upper coil element 110 and the primary-side lower coil element 120 is composed of a wire-wound type coil element in which an insulation-coated wire is wound in a flat plate shape, and the primary-side upper coil element 110 and the other one of the primary-side lower coil elements 120 is a PCB-type coil element [multilayer printed circuit board (MLB) provided with a plurality of stacked insulating substrates (not shown) on which a conductor pattern made of metal is formed in a spiral shape. )].

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

Since the PCB-type coil element (multilayer printed circuit board (MLB)) itself is a known configuration prior to filing the application of the present invention, a detailed description thereof will be omitted.

The primary-side upper coil element 110 has an upper hollow core 110a formed in the center, and is formed by winding insulated-coated conductive wires in contact with each other in a flat shape.

And, the primary-side lower coil element 120 is characterized in that the lower core 120a communicating with the upper core 110a is formed in the center, and the insulating coated conductive wires are brought into contact with each other to be wound in a flat shape. to be

In the planar transformer according to an embodiment of the present invention, a connection pin (Pn) to which the primary-side upper coil element 110 and the primary-side lower coil element 120 are respectively connected is further included, and the first The primary-side upper coil element 110 and the primary-side lower coil element 120 are connected in series by the connection pin Pn.

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

As shown in FIG. 2, the primary-side lower coil element 120 is connected in series with the primary-side upper coil element 110, the first air core 121a is formed in the center, and the conductive wire is coated with insulation. The main air-core coil part 121 [main winding] formed by winding a flat plate in contact with each other, and the first air core provided above or below the main air-core coil part 121 and of the main air-core coil part 121 The second air core 122a is formed in the center to communicate with (121a), and is formed by winding insulated-coated conductive wires in a flat plate shape by contacting each other to form an induced voltage by electromagnetic induction with the main air core coil part 121. It is 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 part [main winding] connected in series with the main air-core coil part 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 device mounted on a main board (not shown).

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

The shielding members 123 and 124 are provided on the upper side of the main air core coil unit 121, have a central hole 123a formed in the center to communicate with the first air core 121a, and are formed in a flat plate shape to shield EMI. A conductive upper shielding member 123 and a central hole 124a are provided on the lower side of the main air core coil unit 121 and communicate with the first air core 121a. It consists of a conductive lower shielding member 124 for 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 provided in contact between the main air-core coil unit 121 and the lower shield member, An induced voltage is generated and outputted 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, has a first central hole 123a formed in the center so as to communicate with the first air core 121a, and uses an insulating coated wire. It may be composed of an upper shielding coil unit 123 that shields EMI formed by winding in a flat plate shape in contact with each other.

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

Meanwhile, the upper shielding member and the lower shielding member may be formed by winding the wire coated with insulation as described above into a flat plate, but are not limited thereto. For example, a shielding copper foil sheet having a central hole in the center and shielding EMI. It may be composed of [for example, a thin copper plate or copper tape [copper foil tape]], or a shielding fiber sheet (not shown) having a central hole and shielding EMI.

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

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 part 121 and electromagnetic induction.

According to the configuration as described above, there is an advantage in that the dielectric strength is higher than in the case of lamination bonding using a bond, so that the distance between the coil parts 121, 122, 123, and 124 can be further narrowed, and the size of the product can be further miniaturized.

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

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

The upper and lower insulating sheets C1 and C2 may be formed of synthetic resin insulating films.

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

As shown in FIG. 3, the primary-side upper coil element 110 is connected in series with the main air-core coil unit 121 of the primary-side lower coil element 120, and the first air core 111a is formed in the center and a main air-core coil unit 111 formed by winding insulated-coated conductive wires in contact with each other in a flat plate shape (to be distinguished from the main air-core coil unit 121 provided in the primary lower 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 to communicate with the first air-core 111a of the main air-core coil part 111, and is coated with insulation. It is characterized in that it is configured to include an auxiliary coil unit 112 formed by winding the wires in contact with each other in a flat plate shape.

At this time, the primary-side lower 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 primary-side upper coil unit 110 .

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

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

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 and 120 according to an embodiment of the present invention.

As shown in FIG. 4 , the primary side upper coil element 110 has a second air core 112a formed in the center, and is formed by winding insulated-coated conductive wires in contact with each other in a flat shape. It is composed of a coil unit 112, and the primary-side lower coil element 120 has a first hollow core 121a formed in the center, and insulated-coated conductive wires are brought into contact with each other to be wound in a flat shape. It is characterized in that it is configured to include the formed main air-core coil unit 121.

As in the case of the first embodiment described later, when the auxiliary coil unit 122 is disposed in the middle of the secondary coil elements 200, the primary lower coil element 120 disposed between the upper and lower secondary coil elements 210 and 220. ) becomes as thick as the thickness of the auxiliary coil unit 122, resulting in an increase in leakage, resulting in a decrease in efficiency.

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

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

Depending on the embodiment, in the primary side lower coil element 120, a second central hole 124a is 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 may be further included to shield EMI formed by winding the wires in a flat plate shape by contacting each other.

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 primary upper and lower coil elements 110 and 120 are characterized in that they are composed of alpha coils (photo in FIG. 17).

That is, in the primary-side upper coil element 110, an air core is formed in the center, and the insulated-coated conductive wires are in contact with each other to be wound in a flat shape, and both ends of the insulated-coated wire are double-wound in different directions. It consists of an alpha coil wound in a flat plate shape.

In addition, in the primary-side lower coil element 120, an air core is formed in the center, and the insulated-coated conductive wires are in contact with each other to be wound in a flat plate shape, and both ends of the insulated-coated wire are double-wound in different directions. It is characterized in that it is composed 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 windings can be reduced and the EMI characteristics can be much improved.

In the planar transformer according to an embodiment of the present invention, a primary side terminal pin (P1) is provided for connection with the primary side upper coil element 110 and the primary side lower coil element 120, and the primary side terminal is provided. The primary side terminal block 240 for installing the pin P1 is formed on either the first coil body 210 or the second coil body 220 described below.

A wire passage groove 240a is formed in the primary side terminal block 240 to pass a wire in order to connect a wire to the primary side terminal pin P1.

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

In the planar transformer according to an embodiment of the present invention, the secondary coil element 200 is molded 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 to form the insulating parts 212 and 222 by injecting and at the same time by insert molding incorporating the secondary coils 211 and 221.

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

As described above, by bending the connecting 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 protruding parts, the primary coil elements 110 and 120 and the secondary side coil element 200 can come into close contact with each other at the same time, and as a result, the distance between the primary side coil elements 110 and 120 and the secondary side coil element 200 becomes very narrow, resulting in excellent self-coupling force and product height. has the advantage of lowering

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

The secondary side 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 the specific configuration of the second coil body 220 will be described.

The first coil body 210 has a first coil pattern portion 211b formed in a spiral pattern of a flat plate, and is bent downward at one end of the first coil pattern portion 211b and then bent backward again to form a U. A first coil 211 composed of a first connecting portion 211c bent in a letter shape, a first terminal 211a formed at an end of the first connecting portion 211c, and a first central through hole 210a in the center. It is configured to include a first insulating part 212 made of a synthetic resin material incorporating the first coil 211 except for the first terminal 211a so that the first terminal 211a is formed.

The second coil body 220 has a second coil pattern portion 221b formed in a spiral pattern of a flat plate, and is bent upward at one end of the second coil pattern portion 221b and then bent backward again to form a U A second coil 221 composed of a second connecting portion 221c bent in a letter shape, a second terminal 221a formed at an end of the second connecting portion 221c, and a second central through hole 220a in the center. It is characterized in that it is configured to include a second insulation part 212 made of a synthetic resin material incorporating the second coil 221 except for the second terminal 221a so that the second terminal 221a is formed.

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

The first connection portion 211c is U-bent downward and then backward-bent obliquely, and the second connection portion 221c is U-bent backward, so that the first connection portion 211c and the second connection portion 221c do not overlap each other. It is characterized in that it is formed so as not to.

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

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

As shown in FIGS. 5 to 12, the main point of the planar transformer according to the first embodiment of the present invention is that the primary coil element and the secondary coil element are arranged in a zigzag pattern.

In the planar transformer according to the first embodiment of the present invention, the primary-side lower coil element 120 is spaced downward from the primary-side upper coil element 110, and is located between the primary-side upper coil element 110. an insertion space (S1) is formed therein, and the secondary side coil element 200 includes a first coil unit 210 and a second coil unit 220 spaced apart from the first coil unit 210. and one of the coil bodies 210 and 220 among the first coil body 210 and the second coil body 220 of the secondary side coil element 200 is inserted into the insertion space S1, It is characterized in that the primary-side upper and lower coil elements 110 and 120 and the secondary-side coil element 200 are alternately (zigzag) positioned in the vertical direction (vertical direction).

The "alternatively provided" means that one of the primary-side upper coil element 110 and the primary-side lower coil element 120 is the first coil unit 210 and the second coil unit 220 facing each other. provided between them, and the other means 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 top to bottom, the primary-side upper coil element 110, the first coil element 210, the primary-side lower coil element 120, and the second coil element 220 are arranged in order (FIG. 5 to FIG. 12], or the first coil unit 210, the primary upper coil unit 110, the second coil unit 220, and the primary lower coil unit 120 are arranged in order.

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

As in the prior art, when the primary coil element is disposed between the upper and lower sides of the secondary coil element, the two surfaces of the secondary coil element (a total of four surfaces of the secondary coil element, that is, the upper and lower two surfaces and Although the primary coil is in contact with a total of two surfaces, one of the upper and lower sides of the two upper and lower surfaces of the lower side), if the primary coil element and the secondary coil element are arranged in a zigzag pattern as described above, three surfaces The primary-side coil element comes into contact with

That is, as in the prior art, two surfaces are in contact in 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 contact area between the primary coil element and the secondary coil element is relatively widened, 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-side upper coil element 110 and the primary-side lower It is characterized in that the holding members 231 , 232 , 233 , and 234 for holding the coil element 120 are further included.

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

In the planar transformer according to the first embodiment of the present invention, the holding members 231 , 232 , 233 , 234 are arranged on one side in the vertical direction (for example, the upper surface in the illustrated example) of the upper or lower surface of the first coil body 210 . the first holding members 231 and 232 for holding the primary-side upper coil element 110 so as to protrude upward and to be provided without separation or play; 1 The second holding members 233 and 234 for holding the primary-side lower coil element 120 are protruded in one direction (e.g., upward) in the vertical direction, which is the same protrusion direction as the holding members 231 and 232, so that they are provided without separation or play. It is characterized in that it is configured to include.

Meanwhile, the first holding members 231 and 232 protruding downward from the lower surface of the first coil body 210 to hold the upper primary coil element 110 and the lower surface of the second coil body 220 It may also be composed of lower holding members 233 and 234 protruding downward to hold the primary-side lower coil element 120. This embodiment includes the first and second coil bodies 210 and 220 shown in FIGS. 5 to 12 Since it is the same configuration as the case of upside down, it is of course included in the technical scope of the present invention in this case as well.

That is, when the primary-side upper coil element 110 and the primary-side lower coil element 120 are located on the upper side of the first coil body 210 and the second coil body 220 and are provided alternately, from the upper surface It protrudes upward, and the primary-side upper coil element 110 and the primary-side lower coil element 120 are located below the first coil body 210 and the second coil body 220 and provided alternately. If it is formed protruding downward from the lower surface, in any case, it belongs to the technical scope of the present invention.

The first holding members 231 and 232 protrude in one direction (eg, upward) in a vertical direction from one surface (eg, upper surface 210b) of the first coil body 210, and are formed to protrude from one surface (eg, upper surface 210b) of the first coil body 210, A first inner protrusion 231 that contacts the inner circumferential surface of the upper air core 110a and holds the inner circumferential surface of the upper air core 110a of the primary upper coil element 110, and the first inner protrusion 231 in the horizontal direction It is spaced outward and is formed to protrude in one direction (eg, upward) in the vertical direction, which is the same direction as the protrusion direction of the first inner projection 231, from one surface (eg, upper surface 210b) of the first coil body 210, 1 It is configured to include a first outer projection 232 that contacts the outer circumferential surface 110b of the primary-side upper coil element 110 and holds the outer circumferential surface 110b of the primary-side upper coil element 110 .

The second holding members 233 and 234 protrude in one direction (eg, upward) in a vertical direction from one surface (eg, upper surface 222b) of the second coil body 220, and are formed to protrude from one surface (eg, upper surface 222b) of the second coil body 220, A second inner projection 233 contacting the inner circumferential surface of the lower hollow core 120a and holding the inner circumferential surface of the lower hollow core 120a of the primary-side lower coil element 120; It is spaced outward and is formed to protrude in one direction (eg, upward) in the vertical direction, which is the same direction as the protrusion direction of the first inner projection 231, from one surface (eg, upper surface 222b) of the second coil body 220, 1 It is configured to include a second outer protrusion 234 that contacts the outer circumferential surface 120b of the primary-side lower coil element 120 and holds the outer circumferential surface 120b of the primary-side lower coil element 120 .

The primary-side upper coil element 110 is disposed on the upper surface 212b of the first coil unit 210, and the primary-side lower coil unit 120 is disposed on the upper surface 222b of the second coil unit 220. witted in

Also, the first inner protrusion 231 protrudes from the upper surface 212b of the first insulating part 212 (that is, the upper surface 212b of the first coil body), and the primary-side upper coil element 110 ) comes into contact with the inner circumferential surface 110a' of the upper hollow core 110a to hold the inner circumferential surface of the upper hollow core 110a of the primary-side upper coil element 110.

The first outer protrusion 232 is spaced outward from the first inner protrusion 231 and protrudes from the upper surface of the first insulating part 212, and is formed on the outer circumferential surface 120b of the primary lower coil element 120. The outer circumferential surface 120b of the primary-side lower coil element 120 is held by contacting it.

In the planar transformer according to the first embodiment of the present invention, in order to connect the wires of the primary-side upper coil element 110 and the primary-side lower coil element 120 to the primary-side terminal pin P1, the first coil The wire insertion channels 251 and 252 for guiding the 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 side terminal block 240 are It is characterized in that a concavity is formed.

In addition, the wire of the main air-core coil unit 121 is terminated inside the main air-core coil unit 121 to be connected to the primary side terminal pin P1 along the wire insertion channels 251 and 252, and the wire insertion channels 251 and 252 ) and connected to the primary side terminal pin (P1).

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

Passing slits 261 and 262 are formed in the inner protrusion 231 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 It is characterized in that it is inserted into the through slits (261 and 262) and inserted into the wire insertion channels (251 and 252) to be wired.

The passing slits 261 and 262 may be formed as a pair to insert the wire of the main air-core coil unit 121 and the wire of the auxiliary coil unit 122, respectively.

In the planar transformer according to the first embodiment of the present invention, a central hole 310a is formed, held by the first holding members 231 and 232 and seated on one surface of the first coil body 210 1 It is characterized in that an upper cover 310 coupled to the first coil body 210 is further included to cover (cover) the vehicle-side upper coil element 110 .

According to this, the primary-side upper coil element 110 can be inserted into the space formed by the first inner protrusion 231, the first outer protrusion 232, and the upper lid 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 is formed on the upper cover 310. Since this is formed, the upper cover 310 is coupled to one surface of the first coil body 210.

A 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.

Next, the configuration and operation of the planar transformer according to the second embodiment of the present invention shown in FIGS. 13 to 16 will be described.

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

In the planar transformer according to the second embodiment of the present invention, the primary-side lower coil element 120 is spaced downward from the primary-side upper coil element 110, and is located between the primary-side upper coil element 110. An insertion space (S1) is formed in the secondary side, and the secondary-side coil element 200 is inserted into the insertion space (S1) formed between the primary-side upper coil element 110 and the primary-side lower coil element 120. It is characterized by being provided.

As described above, according to the configuration in which the secondary side coil element 200 is inserted between the two upper and lower primary side coil elements 110 and the primary side lower coil element 120, the prior art, that is, the two Compared to a technique in which one primary coil element is formed between secondary coil elements, generation of a loss magnetic field is reduced, thereby increasing efficiency from the primary side to the secondary side.

The secondary coil element 200 includes the secondary coils 211 and 221 made of a conductive material formed in a spiral pattern in a flat plate shape, and the secondary coils 211 and 221 are embedded so that a central through hole 210a and 220a is formed in the center. It is composed of insulating parts 212 and 222 made of synthetic resin formed in a flat plate shape, and 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 primary-side lower coil element 120, so that the secondary-side coil element 200 connects to the primary-side upper coil element 110 and the primary-side lower coil element 120. It is characterized by being inserted into the insertion space (S1) of. According to this, there is an advantage in that the bonding force between the primary side and the secondary side increases.

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 is It is determined by design specifications according to the output of the transformer, and in any case belongs to the technical scope of the present invention. In addition, depending on design specifications, three or more secondary coil elements 210 and 220 may be configured, and even in this case, it is a matter of course that it falls within the technical scope of the present invention.

In the planar transformer according to an embodiment of the present invention, an example in which the secondary side coil element 200 is composed of two will be described in detail.

The primary-side upper coil element 110 is placed on the upper surface 212b of the first coil unit 210, and the lower surface 222c of the second coil unit 220 is disposed on the primary-side lower coil unit 120. The upper side is contacted so as to be in close contact.

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

The holding members 235, 236, 237, and 238 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 primary lower coil element 120 are held.

The holding members 235 , 236 , 237 , and 238 protrude upward from the upper surface of the first coil body 210 to hold the primary-side upper coil element 110 without separation or play. And, it protrudes downward from the lower surface of the second coil body 220 in the opposite protruding direction to the first holding members 235 and 236 to hold the primary-side lower coil element 120 so that it is provided without separation or clearance. It is characterized in that it is configured to include a second holding member (237 238).

The first holding members 235 and 236 protrude upward from the upper surface of the first coil body 210, and come into contact with the inner circumferential surface of the upper hollow core 110a of the upper primary coil element 110 to contact the upper primary side. The first inner protrusion 235 holding the inner circumferential surface of the upper hollow core 110a of the coil element 110, and spaced apart from the first inner protrusion 235 in the horizontal direction outwardly, It is configured to include a first outer protrusion 236 protruding upward from the upper surface and contacting the outer circumferential surface 110b of the primary upper coil element 110 to hold the outer circumferential surface 110b of the primary upper coil element 110. do.

Conversely, the second holding members 237 and 238 protrude from the other surface (eg, the lower surface 222c) of the second coil body 220 to the other side in the vertical direction (eg, downward), and the primary lower coil element 120 The second inner protrusion 237 holding the inner circumferential surface of the lower air core 120a of the primary side lower coil element 120 by contacting the inner circumferential surface of the lower air core 120a of the ), and the second inner protrusion 237 is horizontal It is spaced outward in the direction and protrudes from one surface (eg, the lower surface 222c) of the second coil body 220 to the other side (eg, downward) in the vertical direction, which is the same direction as the protrusion direction of the second inner projection 237, , a second outer protrusion 238 that contacts the outer circumferential surface 120b of the primary lower coil element 120 and holds the outer circumferential surface 120b of the primary lower coil element 120.

Meanwhile, as shown in FIG. 16, in the transformer according to another embodiment of the present invention, the second accommodating groove 227 for accommodating the first connection part 211c is of the second coil body 220. A recess is formed in the upper surface 222b, and a first receiving groove 217 for accommodating the second connection part 221c is recessed 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 can come into close contact with each other. According to this, the thickness of the secondary side coil element 200 can be reduced.

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

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

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 on the lower cover 320. In this case, it is characterized in that the lower cover 320 is coupled to one surface of the second coil body 220.

Meanwhile, in the transformer according to another embodiment of the present invention, cross-sections of the wires of the primary-side upper coil element 110 and the primary-side lower coil element 120 are characterized in that they are rectangular. According to this, there is an advantage that the efficiency is increased because the wires are densely packed.

Also, 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.

Meanwhile, a bridge Br for electrically connecting the first coil pattern part 212 and the second coil pattern part 222 may be further included. By this bridge Br, 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 and are configured in series as an example, but it is not limited thereto. Even when the unit 210 and the second coil body 220 are configured in parallel without connection, they belong to the technical scope of the present invention as a matter of course.

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

The scope of the present invention is indicated by the following claims rather than the above detailed description, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts thereof should be construed as being included in the scope of the present invention.

100: primary side coil element
110: primary side upper coil element 110a: upper air core
110a': inner circumferential surface of the upper coil element on the primary side
110b: outer circumferential surface of the primary lower coil element
120: primary side lower coil element 120a: lower air core
120a': inner circumferential surface of the upper coil element on the primary side
120b: outer circumferential surface of the primary lower coil element
Pn: connection pin S1: insertion space
111,121: main air core coil unit 111a, 121a: first air core
C1: upper insulation sheet C2: lower insulation sheet
112,122: auxiliary coil unit 112a, 122a: second air core
123: upper shielding coil unit 123a: first central hole
124: lower shielding coil unit 124a: second central hole
200: secondary coil element 210: first coil element
210: first coil body 211: first flat coil
211a: first terminal 211b: first coil pattern part
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 projection
232: first outer projection 233: second inner projection
234: second outer projection 235: first inner projection
236: first outer projection 237: second inner projection
238: second outer projection P1: primary side terminal pin
P2: secondary side terminal pin 240: primary side terminal block
240a: wire passage groove 251,252: wire insertion channel
261,262: passage slit 310: upper cover
310a: central hole 310b: first fastening hole
320: lower cover 320a: central hole
320b: second fastening hole

Claims (5)

A flat primary side upper coil element 110,
A flat primary-side lower coil element 120 contacting downward or spaced apart from the primary-side upper coil element 110,
It is configured to include a flat 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 primary side upper coil element 110,
An upper hollow core 110a is formed in the center, and is formed by winding insulated-coated conductive wires in a flat shape in contact with each other,
The primary-side lower coil element 120,
A lower core 120a communicating with the upper core 110a is formed in the center, and is formed by winding insulated-coated conductive wires in a flat plate shape in contact with each other,
The primary-side lower coil element 120,
The main air core coil unit 121 is connected in series with the primary side upper coil element 110, has a first air core 121a formed in the center, and is formed by winding insulated-coated conductive wires in a flat plate shape by contacting each other. and,
It is provided above or below the main air-core coil part 121, and a second air-core 122a is formed in the center to communicate with the first air-core 121a of the main air-core coil part 121, and is coated with insulation. It is configured to include an auxiliary coil unit 122 formed by winding conductive wires in a flat plate shape by contacting each other,
The primary-side lower coil element 120,
The conductive shielding members 123 and 124 are provided in contact with the main air core coil unit 121, have central holes 123a and 124a formed to communicate with the first air core 121a, and are formed in a flat plate shape to shield EMI. It is composed of more,
The shielding members 123 and 124,
It is provided on the upper side of the main air core coil unit 121, 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. )and,
A conductive lower shielding member 124 provided on the lower side of the main air core coil unit 121 and having a center hole 124a formed in the center to communicate with the first air core 121a and formed in a flat plate shape to shield EMI consists of,
The auxiliary coil unit 122 is provided in contact between the main air-core coil unit 121 and the upper shielding member or provided in contact between the main air-core coil unit 121 and the lower shielding member, so that the main air-core coil unit 121 is in contact with the lower shielding member. An induced voltage is generated and output by electromagnetic induction with the coil unit 121,
The upper shielding member 123 is provided on the upper side of the main air core coil unit 121, has a first central hole 123a formed in the center so as to communicate with the first air core 121a, and is an insulating coated wire. It consists of an upper shielding coil part 123 that shields EMI formed by winding in a flat plate shape in contact with each other,
The lower shielding member 124 is provided on the lower side of the main air core coil unit 121, has a second central hole 124a formed in the center to communicate with the first air core 121a, and is an insulating coated wire. Plate type transformer, characterized in that consisting of a lower shielding coil portion 124 for shielding the EMI formed by winding the flat plate in contact with each other.
The method of claim 1,
The secondary side coil element 200 includes a first coil body 210 in which a first central hole 210a is formed, and a second central hole 220a spaced downward from the first coil body 210 is formed. It is composed of a second coil body 220,
A primary-side terminal pin (P1) is provided for connection with the primary-side upper coil element 110 and the primary-side lower coil element 120,
The primary side terminal block 240 for installing the primary side terminal pin (P1) is formed on either the first coil body 210 or the second coil body 220,
A wire passage groove 240a is formed in the primary side terminal block 240 to pass a wire in order to connect a wire to the primary side terminal pin P1.
In order to connect the wires of the primary-side upper coil element 110 and the primary-side lower coil element 120 to the primary-side terminal pin P1, the first central hole 210a or the second central hole 210a of the first coil unit 210 Wire insertion channels 251 and 252 for guiding wires from the second central hole 220a of the two-coil body 220 to the primary terminal block 240 are concave,
The wire of the main air-core coil 121 is terminated inside the main air-core coil 121 and connected to the primary side terminal pin P1 along the wire insertion channel 251 to the wire insertion channel 251. It is inserted and connected to the primary side terminal pin (P1),
The wire of the auxiliary coil part 122 terminated inside the auxiliary coil part 122 and connected to the primary side terminal pin P1 is inserted into the wire insertion channel 252 along the wire insertion channel 252. Plate type transformer, characterized in that connected to the primary side terminal pin (P1).
The method of claim 2,
The first coil body 210,
A first coil pattern portion 211b formed in a spiral pattern of a flat plate, and a first connection portion 211c that is bent downward at one end of the first coil pattern portion 211b and then bent backward to be bent in a U shape. ) And a first coil 211 composed of a first terminal 211a formed at the end of the first connection part 211c,
It is configured to include a first insulating part 212 made of a synthetic resin that contains the first coil 211 except for the first terminal 211a so that a first central through hole 210a is formed in the center,
The second coil body 220,
A second coil pattern portion 221b formed in a spiral pattern of a flat plate, and a second connection portion 221c that is bent upward at one end of the second coil pattern portion 221b and then bent backward to be bent in a U shape. ) And a second coil 221 composed of a second terminal 221a formed at the end of the second connection part 221c,
It is configured to include a second insulation part 212 made of a synthetic resin incorporating the second coil 221 excluding the second terminal 221a so that a second central through hole 220a is formed in the center,
It protrudes upward from the upper surface 210b of the first coil body 210 and contacts the inner circumferential surface of the upper hollow core 110a of the primary upper coil element 110 to form the upper part of the primary upper coil element 110. It is configured to further include a first inner protrusion 231 holding the inner circumferential surface of the hollow core 110a,
Passing slits 261 and 262 are formed in the inner protrusion 231 to communicate with the wire insertion channels 251 and 252,
The wire of the main air-core coil part 121 and the wire of the auxiliary coil part 122 are inserted into the passage slits 261 and 262 and inserted into the wire insertion channels 251 and 252 to be wired. Transformer.
The method of claim 3,
The pass-through slits 261 and 262 are formed as a pair for respectively inserting the wire of the main air-core coil unit 121 and the wire of the auxiliary coil unit 122.
The method of claim 3,
The planar transformer, characterized in that the first connection portion 211c that is U-bent downward and the second connection portion 221c that is U-bent upward are U-bent so as not to overlap each other.

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