JP6816609B2 - Transformer device - Google Patents

Description

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

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

According to Patent Document 1, a wire rod for a bifilar-wound coil 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 a separate insulating tape or the like between the wire for the primary coil and the wire for the secondary coil. It is also possible to bring the wire rod and the wire rod for the secondary coil into close contact with each other and wind them around the core.

Japanese Unexamined Patent Publication No. 7-029755

However, according to Patent Document 1, when a plurality of coil wires are wound around the core at the same time by bifilar winding, the holding force is inevitably different between the coil wires, and the coil wires are wound together. It became difficult to put the coil in a wound state, and there was a risk that the characteristics would deteriorate.
Further, when a three-layer insulated wire is used as the wire, it has an advantage that the withstand voltage can be increased, but on the other hand, the cost becomes too high, which exceeds the cost-acceptable range for the user. There can also be a problem of
When selecting such a coil, the best one in terms of characteristics is not always required, and the characteristics according to the application and purpose are satisfied, and the cost is also within a predetermined range according to the application and purpose. It needs to have a well-balanced configuration that fits.
The present invention has been made in view of the above circumstances, and it is possible to efficiently bring two coil wires into the same winding state, and to have various characteristics and costs within a predetermined range. It is an object of the present invention to provide a transformer device.

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

That is, the transformer device according to the present invention is
The primary coil wire material in an annular core and wire for the secondary coil is wound, passing the signal component, is mounted on the network for LAN is between the secondary coil wire and the primary coil wire In the transformer device
The primary coil wire is formed of a one-layer insulating wire, the secondary coil wire is formed of a three-layer insulating wire, and these two insulating wires are twisted together to form a stranded wire. , Is a feature.
In this case, it is preferable that the annular core is a toroidal core.

The first layer insulating wire and the three-layer twisting pitch of the strands of the insulated wire material is 3mm or more and may preferably be a 10mm or less.
Further, it is preferable that the wire diameter of the conductive wire of the one-layer insulating wire and the three-layer insulating wire constituting the stranded wire is 0.2 mm or more and 0.45 mm or less.
In addition, 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 and the conductive wire constituting the stranded wire. The thickness is preferably 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 obtained by spirally twisting a one-layer insulating wire and a three-layer insulating wire. Since it is possible to wind the coil wires in a twisted state, it is possible to make a plurality of coil wires in the same winding state in each of the coil wires. In addition, the wires can be brought into close contact with each other as compared with the case where the coil is wound by bifilar winding, and the impedance can be set to a stable value in the high frequency band. In addition, workability when winding the core of the coil wire is also improved.

In the transformer device of the present invention, since either one of the primary coil and 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, It is possible to secure a certain withstand voltage and maintain the characteristics, and it is possible to suppress a significant increase in manufacturing cost.

As an air-core coil that does not use a core, a technology that uses a twisted twisted wire for the primary coil and a wire for the secondary coil to improve conversion efficiency and reduce the size of the device. Although it is known (Japanese Patent Laid-Open No. 4-328812), the direction of the technical idea is completely different from that of the present invention in that this technique does not use a core. Further, since it does not have a core, it is not possible to prevent leakage of magnetic flux, and it is inevitable that the inductance becomes small. Therefore, the direction of the technique is different from that of the present invention in these respects as well.

It is the schematic which shows the main part of the transformer device which concerns on embodiment of this invention. It is the schematic which shows the form of the coil before winding in the embodiment shown in FIG. It is a perspective view which shows the whole structure of the transformer device which concerns on embodiment of this invention. FIG. 3 is a conceptual diagram when viewed from the back surface side of the device showing the connection relationship between the pin of the transformer device and the wire for the coil shown in FIG. It is a conceptual diagram which shows the winding relationship between two kinds of coil wire rods and a core. It is a graph which shows the change of the frequency characteristic of the passing loss (insertion loss) when the coil twist pitch is changed about this Embodiment. It is a graph which shows the change of the frequency characteristic (primary side) of the reflection loss (return loss) when the coil twist pitch is changed about this Embodiment. It is a graph which shows the change of the frequency characteristic (secondary side) of the reflection loss (return loss) when the coil twist pitch is changed about this Embodiment. It is a graph which shows the change of the frequency characteristic of the passing loss (insertion loss) when the coil diameter is changed about this Embodiment. It is a graph which shows the change of the frequency characteristic (primary side) of the reflection loss (return loss) when the coil diameter is changed about this Embodiment. It is a graph which shows the change of the frequency characteristic (secondary side) of the reflection loss (return loss) when the coil diameter is changed about this Embodiment. It is a graph which shows the change of the frequency characteristic of the passing loss (insertion loss) when the coil film thickness is changed about this Embodiment. It is a graph which shows the change of the frequency characteristic (primary side) of the reflection loss (return loss) when the coil film thickness is changed about this Embodiment. It is a graph which shows the change of the frequency characteristic (secondary side) of the reflection loss (return loss) when the coil film thickness is changed about this Embodiment. It is the schematic which shows the form of the coil before winding in the prior art.

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

FIG. 1 is a schematic view 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 twisted coil 11 is a one-layer insulated wire (for example, polyurethane enamel wire (UEW or the like), also referred to as a normal insulated wire) 11A in which a conductive wire made of a copper material or the like is coated with one layer of insulation. , A three-layer insulated wire (TEX, TIW, etc.) 11B in which a conductive wire made of a copper material or the like is coated with three layers of insulation is twisted into a spiral shape.

By configuring the insulated wires 11A and 11B to be twisted in a spiral shape in this way, when the twist coil 11 is wound around the core 31, the insulated wires 11A and 11B are uniformly intersected with the magnetic flux. It is possible. Further, the two insulated wires 11A and 11B can be wound in substantially the same winding state as the core 31 in a state of being in close contact with each other, the leakage magnetic flux can be reduced, and the impedance in the high frequency band can be reduced. Can be a stable value.
The twisted coil 11 is wound around an annular core 31 at a pitch substantially equal to that of a twisted wire 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 (including not only a circular cross section but also an elliptical shape, a barrel shape, a rectangular shape, etc.), but it is not necessarily limited to the toroidal core. It is not something that is done. For example, a pair of U-shaped cores or a pair of E-shaped cores may be butted against each other to form a closed magnetic path. Further, the ring road is not limited to the ring road, and may be a polygonal ring road.
The main material of the core is ferrite, permalloy, silicon steel plate and the like, but other magnetic materials can also 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 obtained by twisting two types of insulating wires with each other is wound around the toroidal core (the ring-shaped cross section is substantially rectangular) 31 at substantially the same pitch. A transformer body 1, a bobbin 41 accommodating the transformer body 1, and six lines extending downward from the bobbin 41 and electrically connected to the ends of predetermined insulating wires 11A and 11B of the twist coil 11. The terminal pins 51 (1) to 51 (6) are provided.

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

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

The transformer main body 1 is housed so that a part of the transformer main body 1 fits into the recess 46 in a state where the central axis extends in the front-rear wall portions 42 and 43 directions. Further, among the wound twist coils 11, the ends of the one-layer insulated wire (UEW or the like) 11A, which is the primary coil, are electrically connected to the terminal pins 51 (1) to (3), while the other The three-layer insulated wire (TEX, TIW, etc.) 11B, which is the secondary coil, is electrically connected to the terminal pins 51 (4) to (6).

Further, the pair of substrate abutting portions 45A and B are columnar members having a flat bottom surface and long in the front-rear direction, and have substantially the same shape as each other. When this transformer device is attached to a substrate (not shown), an operation is performed in which the transformer device is relatively close to the substrate at a predetermined position. In that operation, the terminal pin 51 (1) is first used. ~ (6) are passed through a through hole 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. As a result, the relative movement of the transformer device is stopped. 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 B, 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 coil and the secondary coil at the base of the terminal pin.

FIG. 4 shows the arrangement of the terminal pins 51 (1) to (6) when the terminal pins 51 (1) to (6) are viewed from the back surface side of the transformer device shown in FIG. 3, and these terminal pins 51. It shows the connection state of the coil with respect to (1) to (6). Further, FIG. 5 shows the winding states of the single-layer insulated wires (UEW) 11A1 and 11A2, which are the primary coil wound around the core 31A, and the three-layer insulated wires (TEX) 11B1 and 11B2, which are the secondary coil. Is shown.

The twist coil 11 wound around the core 31A is shown on the drawing 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 on the drawing, both of which are on the primary side. 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 of the 1-layer insulated wire (UEW) 11A, which is the primary coil, is electrically connected to the terminal pins 51 (1) to (3), while the 3-layer insulated wire (TEX), which is the secondary 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 coil extending from the terminal pin 51 (2) (marked with an S indicating START) and started winding around the core 31A. The one-layer insulated wire (UEW) 11A1 (first twist coil 111A) is wound to the right side of the core 31A on the drawing and then connected to the terminal pin 51 (1). On the other hand, the one-layer insulated wire (UEW) 11A2 (second twist coil 111B) is connected to the terminal pin 51 (1) on the drawing, wound to the left side of the core 31A, and then the terminal pin 51 (3). ) (The code F, which means FINISH) is connected.

On the other hand, the three-layer insulated wire (TEX) 11B1 (first), which is a secondary coil extending from the terminal pin 51 (6) (marked with an S indicating START) and started winding around the core 31A. The twist coil 111A) is wound around the left side of the core 31A on 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) on the drawing, wound to the right side of the core 31A, and then the terminal pin 51 (5). ) (The code F, which means FINISH) is connected.

By the way, how much the twist pitch P of the twist coil 11 should be is whether the shape of the twist coil can be actually maintained and whether the winding work can be performed efficiently.
When the twist pitch P of the twist coil 11 is less than 3 mm, it becomes difficult for the stranded wire to maintain a linear shape, and it is difficult to satisfactorily wind the core 31. On the other hand, if the twist pitch P of the twist coil 11 exceeds 10 mm, it becomes difficult to suppress the slack and unwinding of the twist when winding the twist coil 11, and the efficiency of the winding work is significantly reduced.
Therefore, from this point of view, the twist pitch P of the twist coil 11 is
3mm ≤ P ≤ 10mm
It is preferable to set the twist coil 11 in the range of 1 in order to efficiently wind the twist coil 11 around the core 31 in its original shape.
More preferably
4mm ≤ P ≤ 9mm
Therefore, the above-mentioned action and effect can be made more certain.
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 the twist coil 11 unless it can maintain a good state in terms of characteristics. Therefore, when the twist pitch P of the twist coil 11 is in the range of 3 mm or more and 10 mm or less, the frequency characteristics of the characteristic surface (passage loss (insertion loss), reflection loss (return loss)) (primary side: terminal pin). Whether good values can be obtained for the frequency characteristics of 51 (2) -51 (3)) and return loss (secondary side: between terminal pins 51 (5) -51 (6)). Was verified.

FIG. 6 shows each graph showing the frequency characteristics of the passing loss (insertion loss) when the coil twist pitch P is changed in this embodiment.
The twist coil 11 to be evaluated when obtaining the graph shown in FIG. 6 has a twist pitch P changed from 3 mm to 10 mm in 1 mm increments, and the graphs of FIGS. 6 to 8 are for those pitches. , Each shows a change in characteristics. At this time, the primary coil of the twist coil 11 is a 1-layer insulated wire (2UEW: 0.0155 mm thick) 11A, and the secondary coil of the twist coil 11 is a 3-layer insulated wire (TEX-E: 0.1 mm thick). ) 11B. The coil diameter D is 0.23 mm (same in the graphs shown in FIGS. 7 and 8).
As shown in FIG. 6, the frequency characteristic of the passing loss (insertion loss) becomes better as the twist pitch P becomes smaller, but it is verified that P is within the permissible range at least in the region of 3 mm to 10 mm. Was done.

FIG. 7 shows the frequency characteristics (primary side: between terminal pins 51 (2) and 51 (3)) 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. 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 permissible range at least in the region of 3 mm to 10 mm. Was done.

FIG. 8 shows the frequency characteristics (secondary side: between terminal pins 51 (5) and 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 permissible range at least in the region of 3 mm to 10 mm. Was done.

Next, when the coil diameter D of the conductive wire of each of the insulated wires 11A and B of the twist coil 11 is set to the range of 0.20 mm or more and 0.45 mm or less, which is normally used, the 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) It was verified whether a good value could be obtained in (5) -51 (6))).
In the specification of the present application, when referred to as a coil diameter, it indicates the cross-sectional diameter of the conductive wire excluding the insulating coating.

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

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

FIG. 10 shows each graph showing the frequency characteristics (primary side: between terminal pins 51 (2) and 51 (3)) of the reflection loss (return loss) when the coil diameter D is changed for the present 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 an allowable range at least in the region of 0.2 mm to 0.45 mm. It was verified.

FIG. 11 is a graph showing the frequency characteristics (secondary side: between terminal pins 51 (5) and 51 (6)) of the reflection loss (return loss) when the coil diameter D is changed in this 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 an allowable range at least in the region of 0.2 mm to 0.45 mm. It was verified.

Next, regarding the film thickness (thickness of the insulating material that coats around the metal conductive wire) T of the twist coil 11, the primary coil has 1 UEW (0.0230 mm thickness) and 2 UEW (0.0155 mm thickness) that are normally used. Select either one, and for the secondary coil, select either TEX-E (0.1000 mm thick) or TIW-2 (0.1200 mm thick), which are usually used, and select the insulated wires 11A and 11B, respectively. The total film thickness T was set by combining the film thicknesses of. As a result, the film thickness T is 0.1230 mm thick when TEX-E (0.1000 mm thick) and 1 UEW (0.0230 mm thick) are combined, and TEX-E (0.1000 mm thick) and 2 UEW (0.0155 mm thick) are combined. The thickness is 0.1155 mm, the combination of TIW-2 (0.1200 mm thickness) and 1 UEW (0.0230 mm thickness) is 0.1430 mm thick, and the combination of TIW-2 (0.1200 mm thickness) and 2 UEW (0.0155 mm thickness) is combined. The thickness is 0.1355 mm.
That is, when the film thickness T is set to the range of 0.1155 mm or more and 0.1430 mm or less by measuring each of the four twisted coils 11 having different thicknesses of the film film T as the objects to be measured, the characteristics are characteristic. Frequency characteristics of various surfaces (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: between terminal pins 51 (5) and 51 (6))) It was verified whether a good value could be obtained.

FIG. 12 shows each graph showing the frequency characteristics of the passing loss (insertion loss) when the coil film thickness T is changed in this embodiment. The twist coil 11 to be evaluated when obtaining the graph shown in FIG. 12 has a coil film thickness T changed in four stages from 0.1155 mm to 0.1430 mm, and the graph in FIG. 12 shows the thickness of each of them. The changes in the characteristics of each of the above are shown.
At this time, the twist pitch P of the twist coil 11 is 5 mm, and the coil diameter D is 0.20 mm (same in the graphs shown in FIGS. 13 and 14).

As shown in FIG. 12, the frequency characteristic of the passing loss (insertion loss) becomes better as the coil film thickness T becomes smaller, but it is within the permissible range at least in the range of 0.1155 mm to 0.1430 mm. It has been verified.

FIG. 13 is a graph showing the frequency characteristics (primary side: between terminal pins 51 (2) and 51 (3)) of the reflection loss (return loss) when the coil film thickness T is changed for the present 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 it is within an allowable range at least in the range of 0.1155 mm to 0.1430 mm. It was verified that it was done.

FIG. 14 shows the frequency characteristics (secondary side: between terminal pins 51 (5) and 51 (6)) of the reflection loss (return loss) when the coil film thickness T is changed in 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 region of 0.1155 mm to 0.1430 mm. It was verified that there is.

Although the embodiments of the present invention have been described above, the present invention is not limited to the embodiments of the above-described embodiments, and various aspects 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 film thickness T are set values verified in the above embodiment, but among these elements Even if one or two of the above are out of the verified range, it is possible to obtain some good characteristics.

Further, the constituent materials of the conductive wire of the core and 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 body 11 Twist coil 11A (11A1, 11A2) 1-layer insulated wire (UEW, etc.)
11B (11B1, 11B2) 3-layer insulated wire (TEX, TIW, etc.)
31, 31A Core 41 Bobbin 42 Front side wall 43 Rear side wall 44 Left and right steps 45A, B Board abutting part 46 Recess 111A First twist coil 111B Second twist coil 211 Bifilar coil 211A Primary coil 211B Secondary Coil for

Claims (5)

The primary coil wire material in an annular core and wire for the secondary coil is wound, passing the signal component, is mounted on the network for LAN is between the secondary coil wire and the primary coil wire In the transformer device
The primary coil wire is formed of a one-layer insulating wire, the secondary coil wire is formed of a three-layer insulating wire, and these two insulating wires are twisted together to form a stranded wire. , 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 the twist pitch of the stranded wire of the one-layer insulating wire and the three-layer insulating wire is 3 mm or more and 10 mm or less. Claims 1 to 3 characterized in that the wire diameters of the one-layer insulating wire and the conductive wire of the three-layer insulating wire constituting the stranded wire are 0.2 mm or more and 0.45 mm or less. The transformer device according to any one of the above. 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 each conductive wire of the primary coil wire and the secondary coil wire constituting the stranded wire is The transformer device according to any one of claims 1 to 4, wherein the transformer device has a thickness of 0.1155 mm or more and 0.1430 mm or less.

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