JP2018170397A - Transformer device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make two coil wire materials efficiently and in the same winding state, and to have a balanced structure so that various characteristics and costs fall within a predetermined range. SOLUTION: A primary coil wire rod 11A and a secondary coil wire rod 11B are wound around an annular core 31 and mounted on a network LAN for passing a signal component between the two coil wire rods 11A and 11B. In the transformer device, the primary coil wire material 11A is formed by a single-layer insulating wire material, the secondary coil wire material 11B is formed by a three-layer insulating wire material, and these two wire materials 11A, B are twisted together. The stranded wire (11) is wound around the core 31. [Selection diagram] Figure 1

Description

  The present invention relates to a transformer device used for a network LAN or the like, and more particularly to a transformer device formed by winding a wire for a primary coil and a wire for a secondary coil around an annular core such as a toroidal core. .

In recent years, there is a strong demand for miniaturization of transformer devices used in network LANs and the like, in which a primary coil wire and a secondary coil wire are wound around a minute core is known.
As one of such techniques, when winding a primary coil wire and a secondary coil wire around an annular core such as a toroidal core, the primary coil 211A and the secondary coil 211B are wound. There is known a technique for reducing leakage magnetic flux by winding with a bifilar coil 211 (see FIG. 15) adjacent to each other (see Patent Document 1 below).

According to Patent Document 1, a bifilar-wound coil wire using a three-layer insulated coil is disclosed.
Such a three-layer insulated coil has a high withstand voltage, and when used as a wire, it is used for the primary coil without interposing an additional insulating tape between the wire for the primary coil and the wire for the secondary coil. It is also possible to closely wind the wire and the secondary coil wire around the core.

JP 7-029755 A

However, according to Patent Document 1, when a plurality of coil wires are wound around the core at the same time by bifilar winding, a difference in the holding force is inevitably generated between the coil wires, and the coil wires are It is difficult to make the coil in a winding state, and the characteristics may be deteriorated.
In addition, when a three-layer insulated wire is used as the wire, it has the advantage that the withstand voltage can be increased, but on the other hand, the cost is too high and exceeds the allowable range in terms of cost for the user. It can also cause problems.
When such a coil is selected, the best one is not necessarily required in terms of characteristics, it satisfies the characteristics according to its use and purpose, and is also within a predetermined range according to its use and purpose. It is necessary to have a balanced configuration that can be accommodated.
The present invention has been made in view of the above circumstances, and it is possible to efficiently make the two coil wires into the same winding state, and various characteristics and costs are within a predetermined range. An object of the present invention is to provide a transformer device.

  In order to solve the above problems, a transformer device according to the present invention has the following features.

That is, the transformer device according to the present invention is
A transformer mounted on a network LAN that passes a signal component between the primary coil wire and the secondary coil wire, in which a primary coil wire and a secondary coil wire are wound around an annular core. In the device
The primary coil wire is formed by a single-layer insulating wire, the secondary coil wire is formed by a three-layer insulating wire, and the two insulating wires are formed as a stranded wire that is twisted together. It is characterized by that.
In this case, the annular core is preferably a toroidal core.

It is preferable that the twist pitch of the stranded wire between the one-layer insulating wire and the three-layer insulating wire is 3 mm or more and 10 mm or less.
Furthermore, it is preferable that the wire diameters of the conductive wires of the one-layer insulating wire and the three-layer insulating wire constituting the stranded wire are 0.2 mm or more and 0.45 mm or less.
Further, the total of the coating member of the one-layer insulating wire and the coating member of the three-layer insulating wire interposed between the conductive wires of the primary coil wire and the secondary coil wire constituting the stranded wire It is preferable that the thickness is 0.1155 mm or more and 0.1430 mm or less.

  According to the transformer device of the present invention, the primary coil and the secondary coil are each formed as a stranded wire in which a single-layer insulating wire and a three-layer insulating wire are twisted together in a spiral shape. Since the coil wire rods can be wound in a twisted state, a plurality of coil wire rods can be in the same winding state in each of the coil wire rods. Moreover, it can be made the state which contacted wires more closely compared with the case where a coil is wound by bifilar winding, and can make it a stable value in a high frequency band. Moreover, the workability | operativity at the time of core winding of the wire material for coils is also improved.

  In the coil device of the present invention, since either the primary coil or the secondary coil is a single-layer insulating wire and the other is a three-layer insulating wire, when the primary coil and the secondary coil are twisted together, In addition, a certain level of withstand voltage can be secured and the characteristics can be maintained, and a significant increase in manufacturing cost can be suppressed.

  In addition, as an air-core coil that does not use a core, a technique in which a wire for primary coil and a wire for secondary coil are twisted together is used to improve conversion efficiency and downsize the device. As is known (Japanese Patent Laid-Open No. 4-328812), the direction of the technical idea is completely different from the present invention in that this technique does not use a core. In addition, since a core is not provided, leakage of magnetic flux cannot be prevented, and it is inevitable that inductance is reduced. Therefore, the technical direction is different from the present invention in these points.

It is the schematic which shows the principal part of the transformer apparatus which concerns on embodiment of this invention. It is the schematic which shows the form of the coil before winding in embodiment shown in FIG. 1 is a perspective view showing an overall configuration of a transformer device according to an embodiment of the present invention. It is a conceptual diagram when it sees from the apparatus back surface side which shows the connection relation of the pin of the transformer apparatus shown in FIG. 3, and the wire material for coils. It is a conceptual diagram which shows the winding relationship of two types of wire materials for coils, and a core. It is a graph which shows the change of the frequency characteristic of passage loss (insertion loss) at the time of changing coil twist pitch about this embodiment. It is a graph which shows the change of the frequency characteristic (primary side) of reflection loss (return loss) at the time of changing coil twist pitch about this embodiment. It is a graph which shows the change of the frequency characteristic (secondary side) of reflection loss (return loss) at the time of changing the coil twist pitch about this embodiment. It is a graph which shows the change of the frequency characteristic of passage loss (insertion loss) at the time of changing a coil diameter about this embodiment. It is a graph which shows the change of the frequency characteristic (primary side) of a reflection loss (return loss) at the time of changing a coil diameter about this embodiment. It is a graph which shows the change of the frequency characteristic (secondary side) of reflection loss (return loss) at the time of changing a coil diameter about this embodiment. It is a graph which shows the change of the frequency characteristic of passage loss (insertion loss) at the time of changing coil film thickness about this embodiment. It is a graph which shows the change of the frequency characteristic (primary side) of reflection loss (return loss) at the time of changing coil film thickness about this embodiment. It is a graph which shows the change of the frequency characteristic (secondary side) of reflection loss (return loss) at the time of changing coil film thickness about this embodiment. It is the schematic which shows the form of the coil before winding in a prior art.

  Hereinafter, embodiments of a transformer device according to the present invention will be described with reference to the drawings.

FIG. 1 is a schematic diagram showing the configuration of the transformer device according to the present embodiment, and FIG. 2 shows the twist coil 11 according to FIG. 1 in a state before being wound around the core 31.
As shown in FIG. 2, the twist coil 11 includes a one-layer insulation wire (for example, a polyurethane enamel wire (UEW or the like), usually called an insulation wire) 11A in which a conductive wire made of a copper material or the like is coated with one layer of insulation. Further, a three-layer insulation wire (TEX, TIW, etc.) 11B, which is a conductive wire made of copper or the like and covered with a three-layer insulation coating, is composed of twisted wires twisted together in a spiral shape.

In this way, by configuring the insulated wires 11A and 11B to be twisted together in a spiral shape, when the twist coil 11 is wound around the core 31, the insulated wires 11A and 11B are uniformly crossed with the magnetic flux. It is possible. In addition, the two insulated wires 11A and 11B can be brought into substantially the same winding state with respect to the core 31 in a state where the two insulated wires 11A and 11B are in close contact with each other, thereby reducing leakage magnetic flux and impedance in a high frequency band. Can be a stable value.
The twist coil 11 is wound around the annular core 31 at a substantially equal pitch in a twisted wire state in which these two types of insulating wires are twisted together.

As the annular core 31, it is preferable to use what is generally called a toroidal core (the annular cross section includes not only a circular shape but also an elliptical shape, a barrel shape, a rectangular shape, etc.), but it is not necessarily limited to a toroidal core. Is not to be done. For example, a pair of U-shaped cores or a pair of E-shaped cores may be brought into contact with each other to form a closed magnetic circuit. Moreover, it is not limited to an annular shape, but may be a polygonal annular shape.
The main material of the core is ferrite, permalloy, silicon steel plate or the like, but other magnetic materials can be used, and a dust core can also be used.

FIG. 3 is a perspective view showing the overall configuration of the transformer device according to the present embodiment.
That is, as described above, the twist coil 11 in which two types of insulated wires are twisted together is wound around the toroidal core 31 (annular cross section is substantially rectangular) 31 at a substantially similar pitch. The transformer body 1, the bobbin 41 that accommodates the transformer body 1, and six pieces that extend downward from the bobbin 41 and are electrically connected to the ends of the predetermined insulated wires 11 </ b> A and 11 </ b> B of the twist coil 11. Terminal pins 51 (1) to 51 (6) are provided.

  The bobbin 41 includes left and right step portions (a step portion on the back side (right side in the drawing) hidden by the front wall portion 42) 44 formed between the front wall portion 42 and the rear wall portion 43, front and rear wall portions 42, 43 and a left and right stepped portion 44 are provided with a recess 46 surrounded on all sides, and a pair of substrate abutting portions 45A and 45B projecting downward from the bottom of the recess 46 in the drawing.

  Further, primary side terminal pins 51 (1) to 51 (3) provided in parallel to each other and extending downward from the lower surface of the stepped portion 44 on the left side of the bobbin 41 in the drawing, and the drawing stepped right side of the bobbin 41 ( Secondary terminal pins 51 (4) to 51 (6) provided in parallel with each other and extending downward from the lower surface of 44 (not shown) are provided.

  The transformer body 1 is housed so that a part of the transformer body 1 fits into the recess 46 in a state in which the central axis extends in the direction of the front and rear wall portions 42 and 43. Moreover, the end part of 11 A of 1 layer insulation wires (UEW etc.) which is a primary side coil among the twisted coils 11 wound is electrically connected to the terminal pins 51 (1) to (3), A three-layer insulated wire (TEX, TIW, etc.) 11B that is a secondary coil is electrically connected to the terminal pins 51 (4) to (6).

In addition, the pair of substrate abutting portions 45A and 45B are columnar members that have a flat bottom surface and are long in the front-rear direction, and have substantially the same shape. When the transformer device is attached to a substrate (not shown), an operation of bringing the transformer device relatively close to the substrate at a predetermined position is performed. In this operation, first, the terminal pin 51 (1) is used. To (6) are passed through through holes of a substrate (not shown), and then the bottom surfaces of the substrate abutting portions 45A and B are abutted against the surface of the substrate. This stops the relative movement of the transformer device. That is, the distance between the bottom surface of the bobbin 41 and the substrate surface is regulated by the substrate abutting portions 45A and 45B, and the terminal pins 51 (1) to (6) extend from the root portion to the substrate surface over a predetermined length. Will be exposed above.
That is, it is possible to secure an interval for connecting the primary side coil and the secondary side coil to the root portion of the terminal pin.

  4 shows the arrangement of the terminal pins 51 (1) to (6) and the terminal pins 51 when the terminal pins 51 (1) to (6) are viewed from the back side of the transformer device shown in FIG. The connection state of the coil with respect to (1)-(6) is shown. FIG. 5 shows the winding state of the first-layer insulation wires (UEW) 11A1 and 11A2 that are primary coils wound around the core 31A and the three-layer insulation wires (TEX) 11B1 and 11B2 that are secondary coils. Is shown.

In addition, the twist coil 11 wound around the core 31A is, as shown in FIG.
It is divided into a first twist coil 111A wound on the left side of the core 31A and a second twist coil 111B wound on the right side of the core 31A in the drawing. The coil is electrically coupled by the terminal pin 51 (1), and the secondary coil is electrically coupled by the terminal pin 51 (4).

  The end portion of the first layer insulated wire (UEW) 11A that is the primary side coil is electrically connected to the terminal pins 51 (1) to (3), while the third layer insulated wire (TEX) that is the secondary side coil. The end of 11B is electrically connected to the terminal pins 51 (4) to (6).

  That is, as shown in FIG. 5 (see FIG. 4), the primary side coil that extends from the terminal pin 51 (2) (which is labeled S indicating START) and starts to be wound around the core 31A. The first-layer insulated wire (UEW) 11A1 (first twist coil 111A) is wound around the right side of the core 31A in the drawing and then connected to the terminal pin 51 (1). On the other hand, the single-layer insulated wire (UEW) 11A2 (second twist coil 111B) is connected to the terminal pin 51 (1) in the drawing and wound around the left side of the core 31A, and then the terminal pin 51 (3 ) (Which is marked with an F sign for FINISH).

On the other hand, a three-layer insulated wire (TEX) 11B1 (first), which is a secondary coil that extends from the terminal pin 51 (6) (denoted with S signifying START) and starts to be wound around the core 31A. The twist coil 111A) is wound around the left side of the core 31A in the drawing and then connected to the terminal pin 51 (4). On the other hand, the three-layer insulated wire (TEX) 11B2 (second twist coil 111B) is connected to the terminal pin 51 (4) in the drawing and wound around the right side of the core 31A, and then the terminal pin 51 (5 ) (Which is marked with an F sign for FINISH).

By the way, how much the twist pitch P of the twist coil 11 is set is a problem whether the shape of the twist coil 11 can actually be maintained and the winding work can be efficiently performed.
When the twist pitch P of the twist coil 11 is less than 3 mm, it is difficult to maintain the straight shape of the twisted wire, and it is difficult to wind the core 31 well. On the other hand, when the twist pitch P of the twist coil 11 exceeds 10 mm, it becomes difficult to suppress the sag and unwinding of the twist when the twist coil 11 is wound, and the efficiency of the winding work is greatly reduced.
Therefore, from such a viewpoint, the twist pitch P of the twist coil 11 is
3mm ≦ P ≦ 10mm
It is preferable that the twist coil 11 is wound around the core 31 in an original shape efficiently.
More preferably,
4mm ≤ P ≤ 9mm
Thus, the above-described operation and effect can be made more reliable.
However, when the twist pitch P of the twist coil 11 is in the range of 3 mm or more and 10 mm or less, it is difficult to use it unless it can maintain a good state in terms of characteristics. Therefore, the twisted pitch P of the twist coil 11 is within a range of 3 mm or more and 10 mm or less. 51 (2) -51 (3)) and frequency characteristics of return loss (return loss) (secondary side: between terminal pins 51 (5) -51 (6))) It verified about.

FIG. 6 is a graph showing the frequency characteristics of the passage loss (insertion loss) when the coil twist pitch P is changed in the present embodiment.
The twist coil 11 to be evaluated when obtaining the graph shown in FIG. 6 is obtained by changing the twist pitch P from 3 mm to 10 mm in 1 mm increments, and the graphs in FIGS. Each indicates a change in characteristics. At this time, the primary coil of the twist coil 11 is a single-layer insulated wire (2UEW: 0.0155 mm thickness) 11A, and the secondary coil of the twist coil 11 is a three-layer insulated wire (TEX-E: 0.1 mm thick). ) 11B. The coil diameter D is 0.23 mm (the same applies to the graphs shown in FIGS. 7 and 8).
As shown in FIG. 6, the frequency characteristic of the passage loss (insertion loss) becomes better as the twist pitch P becomes smaller, but it is verified that P is within the allowable range at least in the region of 3 mm to 10 mm. It was done.

FIG. 7 shows each frequency characteristic of the return loss when the coil twist pitch P is changed (primary side: between the terminal pins 51 (2) -51 (3)) in this embodiment. It represents a graph.
As shown in FIG. 7, the frequency characteristic (primary side) of the reflection loss (return loss) becomes better as the twist pitch P becomes smaller, but it is verified that it is within the allowable range at least in the range of 3 mm to 10 mm. It was done.

FIG. 8 shows each of the frequency characteristics (secondary side: between terminal pins 51 (5) -51 (6)) of the reflection loss (return loss) when the coil twist pitch P is changed in this embodiment. It represents a graph.
As shown in FIG. 8, the frequency characteristic (secondary side) of the reflection loss (return loss) becomes better as the twist pitch P becomes smaller, but it is verified that it is within the allowable range at least in the range of 3 mm to 10 mm. It was done.

Next, when the coil diameter D of the conductive wires of the insulated wires 11A and B of the twist coil 11 is in a range of 0.20 mm to 0.45 mm that is normally used, a characteristic surface (passage loss (insertion loss) ) Frequency characteristics, reflection loss (return loss) frequency characteristics (primary side: between terminal pins 51 (2) -51 (3)) and reflection loss (return loss) frequency characteristics (secondary side: terminal pin 51) (Between (5) and 51 (6)))) whether or not a good value was obtained was verified.
In the present specification, the term “coil diameter” refers to the cross-sectional diameter of the conductive wire excluding the insulating coating.

FIG. 9 is a graph showing the frequency characteristics of the passage loss (insertion loss) when the coil diameter D is changed in the present embodiment.
The twist coil 11 to be evaluated when obtaining the graph shown in FIG. 9 is obtained by sequentially changing the coil diameter D from 0.2 mm to 0.45 mm. The graphs of FIGS. Each indicates a change in characteristics.
At this time, the primary coil of the twist coil 11 is a one-layer insulated wire (2UEW: 0.0155 mm thickness), and the secondary coil is a three-layer insulated wire (TEX-E: 0.1000 mm thickness). The twist pitch P is 5 mm (same in the graphs shown in FIGS. 10 and 11).

As shown in FIG. 9, the frequency characteristic of the passage loss (insertion loss) becomes better as the coil diameter D increases, but it is verified that at least D is within the allowable range in the range of 0.2 mm to 0.45 mm. It was done.

FIG. 10 is a graph showing the frequency characteristics of reflection loss (return loss) (primary side: between terminal pins 51 (2) -51 (3)) when the coil diameter D is changed for this embodiment. It is a representation.
As shown in FIG. 10, the frequency characteristic (primary side) of the reflection loss (return loss) becomes better as the coil diameter D increases, but is within the allowable range at least in the range of 0.2 mm to 0.45 mm. It was verified.

FIG. 11 is a graph showing frequency characteristics (secondary side: between terminal pins 51 (5) -51 (6)) of the reflection loss (return loss) when the coil diameter D is changed in the present embodiment. It represents.
As shown in FIG. 11, the frequency characteristic (secondary side) of the reflection loss (return loss) becomes better as the coil diameter D becomes smaller, but is within the allowable range at least in the range of 0.2 mm to 0.45 mm. It was verified.

Next, with respect to the film thickness (thickness of the insulating material covering the periphery of the metal conductive wire) T of the twist coil 11, 1UEW (0.0230mm thickness) and 2UEW (0.0155mm thickness) which are usually used for the primary coil are used. Select either one of the TEX-E (0.1000 mm thickness) and TIW-2 (0.1200 mm thickness) that are normally used for the secondary coil, and select each insulated wire 11A, 11B. The total film thickness T was set by combining these film thicknesses. As a result, the film thickness T is 0.1230mm when TEX-E (0.1000mm thickness) and 1UEW (0.0230mm thickness) are combined, and TEX-E (0.1000mm thickness) and 2UEW (0.0155mm thickness) are combined. 0.1155mm thickness, and TIW-2 (0.1200mm thickness) and 1UEW (0.0230mm thickness) combined 0.1430mm thickness, TIW-2 (0.1200mm thickness) and 2UEW (0.0155mm thickness) combined Will be 0.1355mm thick.
That is, when the film thickness T is in the range of 0.1155 mm or more and 0.1430 mm or less by measuring each of the four twist coils 11 having different film thicknesses T as measurement objects, Frequency characteristics of pass loss (insertion loss), frequency characteristics of reflection loss (return loss) (primary side: between terminal pins 51 (2) -51 (3)) and frequency characteristics of reflection loss (return loss) (Secondary side: between terminal pins 51 (5) -51 (6))), whether or not a good value is obtained was verified.

FIG. 12 shows each graph showing the frequency characteristics of the passage loss (insertion loss) when the coil film thickness T is changed in the present embodiment. The twist coil 11 to be evaluated when obtaining the graph shown in FIG. 12 is obtained by changing the coil film thickness T in four stages from 0.1155 mm to 0.1430 mm, and the graph of FIG. Is a change in characteristics.
At this time, the twist pitch P of the twist coil 11 is 5 mm, and the coil diameter D is 0.20 mm (the same applies to the graphs shown in FIGS. 13 and 14).

  As shown in FIG. 12, the frequency characteristic of the passage loss (insertion loss) becomes better as the coil film thickness T becomes smaller, but it should be within the allowable range at least in the range of 0.1155 mm to 0.1430 mm. Verified.

FIG. 13 is a graph showing the frequency characteristics (primary side: between terminal pins 51 (2) -51 (3)) of the reflection loss (return loss) when the coil film thickness T is changed in this embodiment. It represents.
As shown in FIG. 13, the frequency characteristic (primary side) of the reflection loss (return loss) becomes better as the coil film thickness T becomes smaller, but is within the allowable range at least in the range of 0.1155 mm to 0.1430 mm. It has been verified that

FIG. 14 shows the frequency characteristics (secondary side: between terminal pins 51 (5) -51 (6)) of the reflection loss (return loss) when the coil film thickness T is changed for this embodiment. It represents a graph.
As shown in FIG. 14, the frequency characteristic (secondary side) of the reflection loss (return loss) becomes better as the coil film thickness T becomes smaller, but is within an allowable range at least in the range of 0.1155 mm to 0.1430 mm. It was verified that there was.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the thing of the aspect of the above-mentioned embodiment, A various aspect can be changed.

  For example, with respect to the twist coil 11 described above, it is preferable that all of the coil twist pitch P, the coil diameter D, and the coil coating thickness T be set values verified in the above embodiment. Even if one or two of these are out of the verified range, it is possible to obtain good characteristics to some extent.

  In addition, the constituent materials of the core, the conductive wire of the coil, the bobbin, and the insulating coating are not limited to those of the above embodiment, and various other materials can be used.

1 transformer main body 11 twist coil 11A (11A1, 11A2) 1 layer insulation wire (UEW etc.)
11B (11B1, 11B2) 3 layer insulation wire (TEX, TIW, etc.)
31, 31A Core 41 Bobbin 42 Front side wall portion 43 Rear side wall portion 44 Left and right step portions 45A, B Substrate abutting portion 46 Recessed portion 111A First twist coil 111B Second twist coil 211 Bifilar coil 211A Primary coil 211B Secondary Coil

Claims (5)

A transformer mounted on a network LAN that passes a signal component between the primary coil wire and the secondary coil wire, in which a primary coil wire and a secondary coil wire are wound around an annular core. In the device
The primary coil wire is formed by a single-layer insulating wire, the secondary coil wire is formed by a three-layer insulating wire, and the two insulating wires are formed as a stranded wire that is twisted together. A transformer device characterized by that.   The transformer device according to claim 1, wherein the annular core is a toroidal core.   The transformer device according to claim 1 or 2, wherein a twist pitch of a stranded wire between the one-layer insulating wire and the three-layer insulating wire is 3 mm or more and 10 mm or less.   The wire diameters of the conductive wires of the one-layer insulating wire and the three-layer insulating wire constituting the stranded wire are set to 0.2 mm or more and 0.45 mm or less. The transformer device according to claim 1. The total thickness of the coating member of the one-layer insulating wire and the coating member of the three-layer insulating wire interposed between the conductive wires of the primary coil wire and the secondary coil wire constituting the stranded wire The transformer device according to any one of claims 1 to 4, wherein the transformer device is 0.1155 mm or more and 0.1430 mm or less.

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