KR20200022304A - Secondary coil assembly for transformer - Google Patents

Abstract

The present invention relates to a transformer comprising: a first coil body (210) including a first flat plate type coil (211) which has a first terminal (211a) and a first coil pattern portion (211b) extended from the first terminal (211a) and formed as a flat plate type spiral pattern, and a first insulating material (212) which is formed of a resin material, has a first center hole (210a), and the first flat plate type coil (211) built therein excluding the first terminal (211a); a second coil body (220) including a second flat plate type coil (221) which has a second terminal (221a) and a second coil pattern portion (221b) extended from the second terminal (221a) and formed as a flat plate type spiral pattern, and a second insulating material (222) which is formed of a resin material, has a second center hole (220a), and the second flat plate type coil (221) built therein excluding the second terminal (221a); and holding members holding a first coil element (100) so that the first coil element (100) is not separated or spaced between the first and second coil bodies (210, 220). Therefore, the transformer can increase efficiency and reduce costs.

Description

Secondary coil element for transformers {SECONDARY COIL ASSEMBLY FOR TRANSFORMER}

The present invention relates to a transformer, and more particularly, to a secondary coil element for a transformer that is suitable for improving the efficiency of the transformer and reducing the cost.

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

Among the transformers, small transformers used in mobile phone chargers or the like use coils wound with triple insulated wires (in particular, secondary coils).

However, coils wound with triple insulated wires have difficulty in mass production, such as the need for people to strip the wires directly, and the triple insulated wires are not wound evenly, resulting in high defect rates. A coil that solves some problems is a coil printed on a printed circuit board (PCB), which is easy to mass produce, but has a low current capacity due to its small area and sufficient insulation. There was a problem that the insulation breakdown voltage is not good as compared to the coil using the triple insulated wire.

In order to solve this problem, the proposed technique is disclosed as a "transformer" by the 10-1579427 (published: December 22, 2015).

10-1579427 is a technique of forming a secondary coil of a transformer by insert molding a metal press, and inserting a PCB substrate in which coils are stacked between the pair of secondary coils.

However, the prior art as described above has the following problems.

First, in the related art, the primary coil is formed of a PCB substrate and the PBC substrate is provided between the secondary coils. In this case, there is a problem in that a leakage magnetic field is not generated due to the thickness of the PCB substrate.

In addition, there was an inconvenience in that a coil mount (or base) for mounting the primary coil to the main board should be separately provided.

Document 1: Registered Patent Publication 10-1579427 (Notice date: Dec. 22, 2012) Document 2: Published Patent Publication 10-2016-0041837 (Published: 2016.04.18.)

The present invention was created to solve the problems of the prior art as described above, the object of the secondary coil element for a transformer according to the present invention,

First, by providing a primary coil element for a transformer (hereinafter, also referred to simply as a 'primary coil') in the secondary coil element (also simply referred to as a 'secondary coil') itself, the gap between the primary coil and the secondary coil To keep it to a minimum,

Second, by minimizing the distance between the primary coil and the secondary coil to increase the magnetic coupling force between the primary coil and the secondary coil to improve the power transmission efficiency of the transformer,

Third, by reducing the distance between the primary coil and the secondary coil to minimize the loss of the magnetic field, thereby improving the power transmission efficiency,

Fourth, by forming a holding member in the center position between the secondary coil and the primary coil in the center position, and by inserting the primary coil into the holding member, the secondary coil and the primary coil There is no need for a separate center alignment, which reduces the time spent on center alignment, improving center alignment.

Fifth, the holding member is formed at the correct position centered between the secondary coil and the primary coil, and the holding member is provided with the primary coil to maximize the magnetic induction efficiency and simultaneously suppress the occurrence of ripple. To ensure that

Sixth, by embedding the primary coil in the secondary coil element (loading) to minimize the leakage magnetic flux (leakage magnetic flux),

Seventh, the holding member for holding the primary coil in the first coil body of the secondary coil element is formed, and the second coil body of the secondary coil element functions as the secondary coil and simultaneously covers the holding member to close the primary coil. By carrying out the cover role to charge at the same time, it is possible to hold and charge the primary coil with a simple configuration and also to minimize the volume by using a conventional configuration,

Eighth, the first coil body and the second coil body is formed in series to bridge, and the second coil body is bent U-shape to form a secondary coil element while fixing (holding) and charging the primary coil To do that,

Ninth, by forming the secondary coil element by U-bending the second coil body, the primary coil can be fixed (holding) and charged, thereby reducing the manufacturing cost of the product and improve the workability to reduce the cost To do that,

Tenth, since only the primary coil element is inserted into the second coil body, there is no need for a separate process for assembling the primary coil element, thereby improving the assembly workability of the primary coil element,

Eleventh, by forming a holding member holding the primary coil at the same time as forming the secondary coil, it is possible to shorten the manufacturing process and reduce the cost of the product,

Twelfth, there is no need to provide a terminal block or coil mount for connecting the primary coil to the main board (which is the main board of a finished product such as a charger mounted with a transformer). By forming integrally with the coil, the volume of the product can be made small, so that the space for use in the finished product (charger or power supply in which the transformer is mounted) can be reduced, and thus the volume of the finished product (power supply such as charger or adapter). Can be miniaturized,

The thirteenth, there is no need to separately provide a terminal block or coil mount for connecting the primary coil to the main board, and the terminal block for connecting the primary coil is integrally formed in the secondary coil to reduce the number of parts of the main components. Reduce the cost of assembly, reduce the cost of the product,

Fourteenth, by forming the coil pattern portion connected in series by the bridge, the number of windings can be reduced by half,

Fifteenth, the number of windings can be reduced by half compared to the prior art, so that a large current can flow by widening the width and cross-sectional area of the coil in a predetermined width,

Sixteenth, by reducing the number of windings in half, it is possible to lower the height of the transformer product, to further secure the separation distance from the case of the finished product (charger or adapter, etc.) and to improve the heat generation of the product. , Reduce leakage magnetic field, improve efficiency,

By forming the seventeenth bridge and the first and second coil pattern portions to have the same thickness and width, there is no change in the resistance value as a whole so that the resistance uniformity can be maintained, thereby improving the electromagnetic characteristics such as EMI characteristics. There is provided a secondary coil element for a transformer that is suitable to be possible.

A secondary coil element for a transformer according to the present invention for achieving the above object includes a first flat coil comprising a first terminal and a first coil pattern portion extending from the first terminal to form a flat spiral pattern. A first coil body comprising a first insulating portion made of a synthetic resin material having a first central hole and including a first flat coil except for the first terminal, a second terminal, and a flat plate extending from the second terminal A second flat coil comprising a second coil pattern portion formed in a spiral pattern, and a second insulating portion made of a synthetic resin material having a second central hole formed therein and including a second flat coil except for the second terminal. Primary so that there is no separation or play between the second coil body and the first coil body and the second coil body that face each other so that the primary coil element for generating an induced current in the first and second coil bodies faces each other. For holding an element it is characterized in that comprises a holding member.

The primary coil element built-in transformer of the present invention for achieving the above object, 1 is provided in the insertion space formed by the secondary coil element for the transformer, the first coil body, the inner projections and the outer projections and the second coil body. It is characterized by including a secondary coil element.

In the method for manufacturing a primary coil element-embedded transformer according to the present invention for achieving the above object, the first coil pattern portion and the second terminal in which the first terminal is located inside are punched out by punching the conductive base material with a press die. Forming the first and second coil pattern portions and the bridge such that the second coil pattern portion and the bridge connecting the first coil pattern portion and the second coil pattern portion are located on the same plane. U-bending one terminal to the bridge, U-bending the second terminal to the bridge, and the first insulation of the material in the synthetic resin so that each of the first coil pattern portion and the second coil pattern portion embedded Forming a portion and a second insulating portion, an inner protrusion protruding from the inner surface of the first coil element to hold the inner circumferential surface of the primary coil element, and an inner circumferential surface of the primary coil element Forming an outer projection projecting on the inner surface of the first coil body spaced outwardly from the side projections, inserting the primary coil element into an insertion space formed by the primary coil body, the inner projection and the outer projection; And bending the bridge such that the first insulating portion and the second insulating portion face each other, and inserting the primary coil element by covering the insertion space with the second insulating portion.

The method of manufacturing the primary coil element-embedded transformer of the present invention is characterized in that the formation of the first insulation portion and the second insulation portion and the formation of the inner and outer projections are performed simultaneously.

The method of manufacturing a primary coil element-embedded transformer according to the present invention is characterized in that the bridge is bent such that the first insulating portion and the second insulating portion face each other, and the second insulating portion covers the primary coil element.

In the method of manufacturing a primary coil element-embedded transformer according to the present invention, the step of forming the first and second insulation parts, the inner protrusions, and the outer protrusions may include forming the first coil pattern part and the second coil pattern part in an injection mold cavity. By inserting the synthetic resin after the insert, it is characterized in that the first insulating portion, the second insulating portion, the inner projection and the outer projection are formed at the same time.

In the method of manufacturing the primary coil element-embedded transformer according to the present invention, the step of bending the bridge may be performed at each of two places such that the primary coil element may be inserted between the first coil body and the second coil body facing each other. It is characterized by being formed inward bending.

The secondary coil device for a transformer of the present invention having the configuration as described above has the following effects.

First, by providing a primary coil element for a transformer (hereinafter, referred to simply as a primary coil) in the secondary coil element itself, there is an effect that the distance between the primary coil and the secondary coil can be minimized.

Second, by minimizing the distance between the primary coil and the secondary coil there is an effect that can improve the efficiency of the transformer by increasing the magnetic coupling force between the primary coil and the secondary coil.

Third, the loss magnetic field can be reduced by minimizing the distance between the primary coil and the secondary coil, and as a result, the efficiency of the transformer can be improved.

Fourth, by forming a holding member in the center position between the secondary coil and the primary coil in the center position, and by inserting the primary coil into the holding member, the secondary coil and the primary coil There is no need for a separate center alignment, and the time required for center alignment can be reduced, thereby improving center alignment workability.

Fifth, the holding member is formed in the correct position centered between the secondary coil and the primary coil, and the holding member is provided with the primary coil, so that the efficiency of the transformer can be increased and the ripple generation can be suppressed. It can be effective.

Sixth, there is an effect that the leakage magnetic field can be minimized by inserting the primary coil into the secondary coil element.

Seventh, the holding member for holding the primary coil in the first coil body of the secondary coil element, the second coil body of the secondary coil element while holding the secondary coil function and at the same time holding in the first coil body By simultaneously performing the role of covering and covering the member, there is an effect that the primary coil can be held and charged with a simple configuration and with a minimum volume by using a conventional configuration.

Eighth, the first coil body and the second coil body is formed in series to bridge, and the second coil body is bent U-shape to form a secondary coil element while fixing (holding) and charging the primary coil There is an effect that can be done.

Ninth, by forming the secondary coil element by U-bending the second coil body, the primary coil can be fixed (holding) and charged, thereby reducing the manufacturing cost of the product and improve the workability to reduce the cost There is an effect that can be done.

Tenth, since only the primary coil element is inserted into the second coil body, there is no need for a separate process for assembling the primary coil element, thereby improving the assembly workability of the primary coil element.

Eleventh, by forming the holding member holding the primary coil at the same time as forming the secondary coil, there is an effect that can shorten the manufacturing process and reduce the cost of the product.

Twelfth, it is not necessary to separately provide a terminal block or coil mount for connecting the primary coil to the main board, and by forming the terminal block for connecting the primary coil to the secondary coil integrally, the volume of the product can be reduced. Therefore, the occupied space in the finished product (charger or power supply) can be reduced, and as a result, the volume of the finished product can be reduced.

The thirteenth, there is no need to separately provide a terminal block or coil mount for connecting the primary coil to the main board, and the terminal block for connecting the primary coil is integrally formed in the secondary coil to reduce the number of parts of the main components. It is possible to reduce the cost of the product by reducing the assembly labor.

Fourteenth, by forming the coil pattern portion connected in series by the bridge, the number of turns can be reduced by half compared to the conventional.

Fifteenth, by reducing the number of windings in half compared to the conventional, there is an effect that a large current can flow by widening the width and the cross-sectional area of the coil in a situation where the width is determined.

Sixteenth, by reducing the number of windings in half, the height of the transformer product can be lowered, thus providing more separation distance from the case of the charger or adapter, improving the heat of the product, reducing the leakage magnetic field, The efficiency is improved.

By forming the seventeenth bridge and the first and second coil pattern portions to have the same thickness and width, there is no change in the resistance value as a whole, so that the resistance uniformity can be maintained. As a result, the electromagnetic characteristics, such as the EMI characteristics, are improved. There is an effect that can be.

1 is a perspective view of a secondary coil element 200 for a transformer according to an embodiment of the present invention.
FIG. 2 is a rear perspective view of FIG. 1.
3 is a cross-sectional view of the secondary coil device 200 for a transformer according to an embodiment of the present invention.
4 is a side view of FIG. 1.
5 is a perspective view before the secondary coil element 200 for a transformer according to an embodiment of the present invention is bent.
FIG. 6 is a main view of a pressing process of a secondary coil element 200 for a transformer according to an embodiment of the present invention, and FIG. 6A illustrates a first coil pattern in which a first terminal 211a is located. The second coil pattern part 221b and the bridge 230 in which the part 211b and the second terminal 221a are located are disposed in the same plane, and FIG. (A) is a plan view of the first terminal 211a and the second terminal 221a bent U-shaped toward the bridge 230, Figure 6 (c) is a bridge in Figure 6 (b) It is a top view of the state which bent 230.
7 is an operation diagram of inserting the primary coil element 100 in the transformer secondary coil element 200 according to an embodiment of the present invention.
8 is a cross-sectional view of the primary coil element built-in transformer A in which the primary coil element 100 is inserted.
9 is a modified embodiment of the secondary coil element 200 for a transformer according to an embodiment of the present invention.
10 is a flowchart of a method of manufacturing a primary coil element-embedded transformer.

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

The secondary coil element for a transformer according to the present invention particularly relates to a flat plate secondary coil element for a transformer in which a coil pattern (corresponding to the coil pattern portion below) is formed in a flat shape.

In the primary coil element built-in transformer (A) according to an embodiment of the present invention, the term "primary coil element embedded type" means that the primary coil element 100 is inserted into the secondary coil element 200. In other respects, it can be seen that the primary coil element 100 and the secondary coil element 200 are integrated.

As shown, the secondary coil element 200 for a transformer according to an embodiment of the present invention, the first terminal 211a and the first terminal 211a extending from the first formed in a flat spiral pattern The first flat coil 211 composed of the first coil pattern part 211b and the first central hole 210a are formed, and the first flat coil 211 except for the first terminal 211a is incorporated therein. The first coil body 210, the second terminal 221a, and the second terminal (consisting of only the first coil pattern portion 211b) composed of the first insulating portion 212 made of a synthetic resin material. A second flat coil 221 formed of a second coil pattern portion 221b extending from 221a and formed in a flat spiral pattern and a second central hole 220a are formed and the second terminal 221a is formed. A second insulating portion 222 of a synthetic resin material having a second flat coil 221 (and thus only the second coil pattern portion 221b) built therein except Primary coils for generating an induction current (induction electromotive force) in the second coil body 220 and the first and second coil bodies 210 and 220 which have electromagnetic interactions with the first and second coil bodies 210 and 220, respectively. Including the holding members (231, 232, 233, 234) for holding the primary coil element 100 so that there is no separation or clearance between the first coil body 210 and the second coil body 220 facing each other It is characterized in that the configuration.

The holding members 231, 232, 233, and 234 hold the position of the primary coil element 100 at a predetermined position without flow, and thus may be referred to as a guider, a holder, or a positioner.

In the transformer secondary coil device 200 according to an embodiment of the present invention, the holding members 231, 232, 233, and 234 are in a state where the first coil body 210 and the second coil body 220 face each other. , The inner surface 210b of the first coil body 210 (the surface facing the second coil body 220) or the inner surface 220b of the second coil body 220 facing the first coil body 210. It is formed on at least one of the inner surface (210b, 220b) of, characterized in that for holding the primary coil element (100).

In the secondary coil element 200 for a transformer according to an embodiment of the present invention, the holding members 231, 232, 233, and 234 may include a primary coil element 100 provided in the first and second coil pattern portions 211b and 221b. To hold the primary coil element 100 in the same position as the first and second coil pattern portions 211b and 221b (ie, center aligned in the vertical direction) so as to be aligned with the center without being eccentric with respect. do.

Specifically, for example, the holding members 231, 232, 233, and 234 protrude toward the second coil body 220 on the inner surface 210b of the first coil body 210, and have a central hole in the primary coil element 100. Inner protrusions 231 and 233 which contact the inner circumferential surface 100 a ′ of (100 a) and hold the inner circumferential surface 100 a ′ of the central through hole 100 a of the primary coil element 100, and radial directions in the inner protrusions 231 and 233. Spaced outwardly of the first coil body 210 to protrude toward the second coil body 220 on the inner surface (210b), the primary coil element in contact with the outer peripheral surface (100b) of the primary coil element (100) It characterized in that it comprises an outer projection (232,234) for holding the outer peripheral surface (100b) of (100).

In this case, the primary coil element 100 is mounted on the inner surface 210b of the first coil body 210 and is sandwiched and held between the inner protrusions 231 and 233 and the outer protrusions 232 and 234.

Preferably, as shown, the inner protrusions (231, 233) is preferably formed to protrude along the first central hole (210a).

As illustrated, the inner protrusion 231 is formed to protrude in a rim, and the outer protrusion 232 is formed to protrude in a rim.

Meanwhile, as a modified example, the inner protrusions 233 may be formed discretely at intervals, and likewise, the outer protrusions 234 may be formed discretely at intervals, and thus the inner and outer protrusions 231, 232, 233, 234. ) Is within the technical scope of the present invention in any case as long as the primary coil element 100, regardless of its shape.

In the secondary coil device 200 for a transformer according to an embodiment of the present invention, the inner protrusions 231 and 233 and the outer protrusions 232 and 234 are formed integrally with the first insulating portion 212. .

Preferably, the inner protrusions 231 and 233 and the outer protrusions 232 and 234 are integrally formed by the first insulating portion 212 and the insert molding.

According to this, there is an advantage that the inner protrusions 231 and 233, the outer protrusions 232 and 234 and the first insulating portion 212 can be simultaneously formed in one injection process.

In another embodiment, the inner protrusions 231 and 233 and the outer protrusions 232 and 234 may be formed on the inner surface of the first insulating portion 212 by bonding means. At this time, the adhesive means is, for example, adhesive, double-sided tape.

In the secondary coil element 200 for a transformer according to an embodiment of the present invention, the terminal block 240 in which the plurality of terminal holes 240a are formed is formed in the first insulating portion 212. It is done. Preferably, the terminal block 240 is formed at the front end of the first insulating portion 212 as shown. The terminal hole 240a is provided with a primary terminal pin P1, and the primary terminal pin P1 is connected to the primary coil element 100.

In the transformer secondary coil element 200 according to an embodiment of the present invention, the second coil body 220, the primary coil is provided between the inner projections (231, 233) and the outer projections (232,234). It serves as a cover to cover the device (100).

Preferably, the second coil body 220 may cover and press the primary coil element 100 provided between the inner protrusions 231 and 233 and the outer protrusions 232 and 234.

In this case, the primary coil element 100 is charged in the insertion space S1 formed by the first coil body 210, the inner protrusions 231 and 233, the outer protrusions 232 and 234, and the second coil body 220.

More preferably, the second coil body 220 may press the primary coil element 100 to prevent play or flow of the primary coil element 100.

Meanwhile, in the above embodiment, the holding members 231, 232, 233, 234 are formed in the first coil body 210, for example. However, according to the exemplary embodiment, the holding members 231, 232, 233, 234 are formed in the second coil body 220. The first coil body 210 and the second coil body 220 may be formed at the same time, and in any case, of course belongs to the technical scope of the present invention.

In the secondary coil element 200 for a transformer according to an embodiment of the present invention, the first insulating portion 212 is inserted into the injection mold after inserting the first flat coil 211 into an injection mold. It is formed by molding, the second insulating portion 222 is characterized by being formed by insert molding by resin injection after inserting the second flat coil 221 to the injection mold.

In the secondary coil device 200 for a transformer according to an embodiment of the present invention, the first insulating portion 212 and the second insulating portion 222 is the first flat coil 211 and the second flat plate After the mold coil 211 is inserted into the injection mold, it is formed by insert molding by resin injection.

More preferably, the first and second insulating parts 212 and 222 may be formed simultaneously by insert injection molding.

Next will be described the configuration and operation of the transformer secondary coil element 200 according to another embodiment of the present invention.

In the transformer secondary coil device 200 according to another embodiment of the present invention, the bridge 250 for connecting the first flat coil 211 and the second flat coil 221 in series is further included It is characterized in that the configuration.

One end of the bridge 250 is connected to the first coil pattern part 211b and the other end is connected to the second coil pattern part 221b so that the first coil pattern part 211b and the second coil pattern part ( 221b is connected in series, and the bridge 250 is bent so that the first coil body 210 and the second coil body 220 face each other.

As described above, since the first coil pattern portion 211b and the second coil pattern portion 221b are connected in series by the bridge 250, the number of turns is reduced by half compared with the related art. For example, in the same conventional case, four windings are sufficient in the case of the present invention.

Since the number of windings is reduced by half as described above, the width of the coil pattern parts 211b and 221b is increased and the cross-sectional area is widened under the condition that the width is determined.

In addition, since the number of windings is reduced by half, the height of the first and second coil bodies 210 and 220 may be lowered. Because the number of windings is reduced by half, it is possible to make the thickness thinner by making it wider in production, and even though the thickness is made thinner, the width is wider, so that the same amount of current can be sent. As such, even though the same current flows, the thickness becomes thinner, and thus the height is lowered.

As the height is lowered, the height of the transformer can be lowered to further secure the separation distance from the case of the charger or the adapter, improve the product heat, reduce the leakage magnetic field, and improve the efficiency.

In addition, according to the configuration of the bridge 250 as described above, there is an advantage that the assembling work of the primary coil element 100 is improved because the assembly of the primary coil element 100 is simple.

In addition, since a separate center alignment is not required for the pair of first and second coil bodies 210 and 220, the time required for the center alignment operation can be reduced, thereby improving center alignment workability.

In the related art, the upper and lower sides are separated and assembled, but there is an advantage in that the work for the upper and lower sides is not required.

In the secondary coil element 200 for a transformer according to another embodiment of the present invention, the bridge 250 is one between the first coil body 210 and the second coil body 220 facing each other. It is characterized by being formed inwardly bent in two places so that the secondary coil element 100 is provided.

In the secondary coil element 200 for a transformer according to another embodiment of the present invention, the first and second coil pattern parts 211b and 221b and the bridge 250 are formed at the same time.

According to this, there exists an advantage that the productivity of a product improves. In addition, since the first and second coil pattern parts 211b and 221b and the bridge 250 are molded at the same time, there is an advantage that a separate center alignment is not required for the pair of first and second coil bodies 210 and 220. . In addition, there is an advantage that the mechanical work can be easily made by eliminating the need to separate the upper and lower sides

In the secondary coil device 200 for a transformer according to another embodiment of the present invention, the bridge 250 is integrated at the same time to have the same thickness and width as the first and second coil pattern portions 211b and 221b. Characterized in that formed.

According to this, there is no change in the resistance value as a whole, so that the resistance uniformity can be maintained, and as a result, the electromagnetic characteristic, for example, the EMI characteristic is improved.

In the transformer secondary coil element 200 according to another embodiment of the present invention, the bridge 250 is the width (w1) direction of the first coil pattern portion 211b and the second coil pattern portion 221b. It is formed in the center with respect to the width (w2) direction of the, and the first terminal 211a and the second terminal 221a is characterized in that formed on the opposite side with respect to the bridge (250).

In the secondary coil device 200 for a transformer according to another embodiment of the present invention, the first terminal 211a is not in contact with the first coil pattern portion 211b so that the first coil pattern portion 211b does not come into contact with the first coil pattern portion 211b. Is bent downwardly (in the opposite direction to the side where the second coil body 220 is located) and then bent backwards again, so that the second terminal 221a is not in contact with the second coil pattern portion 221b. The second coil pattern part 221b is bent upwardly (in the opposite direction to the side in which the first coil body 210 is located) and then bent backwards.

It is preferable that a bending line (not shown) is formed in two places for bending the said bridge 250, for example by a notching die etc.

In the secondary coil element 200 for a transformer according to another embodiment of the present invention, in order to firmly fix the primary coil element 100 is inserted between the first, second coil body (210, 220), It is characterized in that it further comprises a locking member for fastening the first coil body 210 and the second coil body 220 to each other.

According to the configuration of the locking member, there is an advantage that the primary coil element 100 charged in the insertion space (S1) can be fixed even more firmly without being pulled out.

On the other hand, when the bridge 250 is additionally configured, according to the configuration of the locking members 215 and 225, the first and second coil bodies 210 and 220 also have a function of maintaining the bent state.

The locking member is characterized in that the removable fitting.

The locking member is formed on one side of the first coil body 210 so that the fitting groove 225 is formed in one side of the second coil body 220 and detachably fitted to the fitting groove 225. It characterized in that it comprises a fitting protrusion 215.

In the illustrated drawings, the fitting groove 225 is formed in the second coil body 220 and the fitting protrusion 215 is described in the first coil body 210 by way of example, but is not limited thereto. On the contrary, that is, the fitting groove 225 is formed in the first coil body 210 and the fitting protrusion 215 is formed in the second coil body 220 also belong to the technical scope of the present invention. Of course.

In the drawing, the fitting groove 225 is formed at the rear end of the second coil body 220, and the fitting protrusion 215 is formed at the rear end of the first coil body 210. However, the present invention is not limited thereto, and vice versa, the fitting groove 225 is formed at the front end of the second coil body 220, and the fitting protrusion 215 is formed at the front end of the first coil body 210. Of course, even if it belongs to the technical scope of the present invention.

Therefore, the locking member is all within the technical scope as long as it is a configuration for charging by pressing the primary coil element 100.

Next, a transformer A having (used) the secondary coil element 200 for a transformer will be described.

In the transformer A having the secondary coil element 200 (used) according to an embodiment of the present invention, since the primary coil element 100 is provided (built in) inside the secondary coil element 200. May be referred to as a "primary coil element built-in transformer (A)", or as a result of the integral of the primary coil element 100 and the secondary coil element 200 "a primary and secondary coil element integrated transformer (A) May be named.

The primary coil element built-in transformer A according to an embodiment of the present invention includes the secondary coil element 200 for the transformer, the first coil body 210, the inner protrusions 231 and 233, and the outer protrusions 232 and 234. ) And the primary coil element 100 provided in the insertion space S1 formed by the second coil body 220.

Preferably, the primary coil element 100 is characterized in that it is formed of an insulated copper wire wound in contact with each other so that an air core is formed in the center.

When the copper wire is wound and formed in this manner, it is easy to insert into the insertion space S1, and the volume of the whole product can be reduced.

In the primary coil element built-in transformer A according to an embodiment of the present invention, a plurality of ones provided in the terminal hole 240a of the terminal block 240 and connected to the primary coil element 100 are provided. It is characterized in that the vehicle terminal pin (P1) is further included.

The following describes a method of manufacturing a primary coil element built-in transformer according to an embodiment of the present invention according to an embodiment of the present invention having the configuration as described above.

First, a conductive base material is prepared. The conductive base material may be a thin sheet-shaped copper plate.

Next, in order to form the first and second coil pattern parts 211b and 221b and the bridge 250, a step of punching the conductive base material by a press mold (S310 and S312) is performed.

When the conductive base material is punched out by the press die, the first coil pattern portion 211b in which the first terminal 211a is located inside and the second coil pattern portion 221b in which the second terminal 221a is positioned inside and The first and second coil pattern parts 211b and 221b and the bridge 250 so that the bridges 250 connecting the first coil pattern part 211b and the second coil pattern part 221b are located on the same plane. ) Is formed (S310).

The first terminal 211a is bent in a U-shape toward the bridge 250, and the second terminal 221a is bent in a U-shape toward the bridge 250 (S312).

Next, the first insulating part 212 and the second insulating part 222 are formed in a synthetic resin so that the first coil pattern part 211b and the second coil pattern part 221b are embedded (S314).

In addition, an inner protrusion 231 protruding from the inner surface 210b of the first coil body 210 along the first central hole 210a to hold the inner circumferential surface 100a of the primary coil element 100, and 1 In order to hold the outer circumferential surface 100b of the difference coil element 100, the outer protrusions 232 protruding from the inner protrusions 231 and 233 outwardly are formed to protrude on the inner surface of the first coil body 210 (S316).

In this case, the forming of the first insulating portion 212 and the second insulating portion 222 (S314) and the forming of the inner protrusion 231 and the outer protrusion 232 (S316) may be performed temporarily. But it can also be done at the same time.

That is, preferably, the formation of the first insulation portion 212 and the second insulation portion 222 and the formation of the inner protrusions 231 and 233 and the outer protrusions 232 and 234 are performed simultaneously, more preferably, the first coil. By inserting the pattern portion 211b and the second coil pattern portion 221b into the cavity of the injection mold, respectively, and then injecting the synthetic resin, the first insulation portion 212, the second insulation portion 222, and the inner protrusions 231 and 233. And outer protrusions 232 and 234 are formed at the same time.

Next, the primary circumferential surface 100a ′ of the primary coil element 100 contacts the inner protrusions 231 and 233, and the outer circumferential surface 100b of the primary coil element 100 contacts the outer protrusions 232 and 234. The primary coil element 100 is inserted into the insertion space S1 formed by the coil element 100, the inner protrusions 231 and 233, and the outer protrusions 232 and 234 (S318).

Then, the bridge 250 is bent so that the first insulating portion 212 and the second insulating portion 222 face each other (S320), and then the second insulating portion 222 is the insertion space S1. ) And charging the primary coil element 100 is performed (S322).

Here, the steps S320 and S322 are performed in succession, while bending the bridge 250 such that the first insulating part 212 and the second insulating part 222 face each other, and simultaneously, the second insulating part 222. ) Covers the primary coil element 100.

Meanwhile, in the step S318 of bending the bridge 250, the primary coil element 100 may be inserted between the first coil body 210 and the second coil body 220 facing each other. It is preferable to bend inwardly in two places, respectively.

Meanwhile, in the illustrated example, the secondary coil element 200 has been described using an example of a series coil element in which the first coil body 210 and the second coil body 220 are connected in series by the bridge 250. Of course, the first coil body 210 and the second coil body 220 of the so-called parallel type secondary coil elements that are connected to the main board of the finished product, respectively, which are not connected by the bridge 250 separately. Even if it belongs to the technical scope of the present invention, of course.

As described above, the preferred embodiments of the present invention have been described, and it is common knowledge in the art that the present invention may be implemented in other specific forms without changing the technical spirit or essential features in addition to the above-described embodiments. It is self-evident to those who have. Therefore, the above-described embodiments are to be understood as illustrative and not restrictive.

The scope of the present invention is shown by the following claims rather than the above description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention.

200: secondary coil element for a transformer according to an embodiment of the present invention
210: first coil body 211: first flat coil
211a: first terminal 211b: first coil pattern portion
w1: width of the first coil pattern portion 210a: first central hole
210b: inner surface of the first coil body 212: first insulating portion
215: fitting
220: second coil body 221: second flat coil
221a: second terminal 221b: second coil pattern portion
w2: width of the second coil pattern portion 220a: second central hole
220b: inner surface of the second coil body 222: second insulating portion
225: fitting groove
230: holding member 231,233: inner projection
232,234: outer protrusion S1: insertion space
240: terminal block 240a: terminal hole
250 bridge
100: primary coil element 100a: central through hole of primary coil element
100a ': inner circumferential surface of the primary coil element 100b': inner circumferential surface of the primary coil element
P1: Primary Terminal Pin
A: Primary coil element built-in transformer according to an embodiment of the present invention

Claims (4)

A first flat coil 211 composed of a first terminal 211a, a first coil pattern portion 211b extending from the first terminal 211a and formed in a flat spiral pattern, and a first central hole A first coil body 210 including a first insulation portion 212 made of a synthetic resin material having a 210a formed therein and including a first flat coil 211 excluding the first terminal 211a;
A second flat coil 221 composed of a second terminal 221a, a second coil pattern portion 221b extending from the second terminal 221a to form a flat spiral pattern, and a second central hole; A second coil body 220 having a second insulation 222 formed of a synthetic resin material having a 220a formed therein and including a second flat coil 221 except for the second terminal 221a;
Departure or clearance between the first coil body 210 and the second coil body 220 in which the primary coil element 100 for generating an induced current in the first and second coil bodies 210 and 220 face each other The secondary coil device for a transformer, characterized in that it comprises a holding member (231,232,233,234) for holding the primary coil device 100 so that there is no.
The method according to claim 1,
The holding members (231, 232, 233, 234),
In the state in which the first coil body 210 and the second coil body 220 face each other, either the inner surface 210b of the first coil body 210 or the inner surface 220b of the second coil body 220. A secondary coil element for a transformer, which is formed on at least one inner surface (210b, 220b) to hold the primary coil element (100).
The method according to claim 2,
The holding members (231, 232, 233, 234),
The primary coil element 100 is not eccentric with respect to the first and second coil pattern portions 211b and 221b and is positioned at the same position as the first and second coil pattern portions 211b and 221b in the vertical direction. Secondary coil element for a transformer, characterized in that holding (100).
The method according to claim 1,
A bridge 250 for connecting the first flat coil 211 and the second flat coil 221 in series is further included.
One end of the bridge 250 is connected to the first coil pattern part 211b and the other end is connected to the second coil pattern part 221b so that the first coil pattern part 211b and the second coil pattern part ( 221b) in series,
The secondary coil element for a transformer, characterized in that the bridge 250 is bent so that the first coil body 210 and the second coil body 220 face each other.

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