JP2013042002A - Transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the workability of winding work of a transformer, and also to improve characteristics while suppressing variations in the characteristics of the transformer.SOLUTION: A through-hole 36 and a through-hole 38 having a smaller area than the through-hole 36 are formed in a core 30, a winding 14 is wound around the through-hole 36, and a winding 8 is wound around the through-hole 38. The number of turns of the winding 8 is smaller than that of the winding 14, and the through-hole 38 is formed smaller than the through-hole 36.

Description

  The present invention relates to a transformer, and more particularly, to a transformer using an eyeglass core having two through holes.

  Conventionally, an example of a high-frequency transformer using an eyeglass core is disclosed in FIG. In FIG. 2 of Patent Document 1, one winding is wound around one through hole, and another winding is wound around the other through hole.

Japanese Utility Model Publication No. 3-12407

  A high-frequency transformer using such a spectacle core may be used as a transformer for a branching device. For example, as shown in FIG. 6, the one branching unit has a main line side winding 6 between the input terminal 2 and the output terminal 4, and a main line side winding 8 that is electromagnetically coupled to the main line side winding 6. One end is grounded, the other end is connected to one end of the branch side winding 10, and the other end of the branch side winding 10 is connected to the branch terminal 12. One end of the branch-side ground winding 14 electromagnetically coupled to the branch-side winding 10 is connected to the output terminal 4 and the other end is grounded. The connection point between the trunk side ground winding 8 and the branch side winding 10 is grounded via a matching resistor 16. Each of the windings 6, 8, 10 and 14 has a circular shape having the same thickness, for example, the same outer diameter. The trunk side winding 6 has the least number of turns, for example, one turn (T), and the trunk side grounding. The winding 8 has a larger number of turns than the main line side winding 6, for example, 3T. The branch side winding 10 has more turns than the main line side winding 6, but has a smaller number of turns than the main line side winding 8, for example, 2T, and the branch side ground winding 14 has the largest number of turns, for example, 7T. It is.

  These windings 6, 8, 10, and 14 are provided in a spectacle core 18 as shown in FIG. The eyeglass core 18 is of an oval type, and through holes 20 and 22 having the same diameter passing through the opposing main surfaces 17 and 19 are formed at intervals in the length direction of the eyeglass core 18. As shown in FIG. 8, the through-hole 20 is provided with a main line side winding 6 and a main line side ground winding 8. That is, the main line side winding 6 is inserted into the through hole 20 so as to come out from the main surface 17 side to the main surface 19 side, and one end of the main line side ground winding 8 is inserted into the through hole 20 from the main surface 17 side. Repeatedly being inserted into the main surface 19 side, folded back to one end side on the main surface 19 side, folded back to the main surface 17 side on one end side, and inserted into the through hole 20 again. The eyeglass core 18 is wound around the winding part 24 between the one end part through-hole 20 and drawn out to the main surface 19 side. Similarly, the through-hole 22 is provided with a branch side winding 10 and a branch side ground winding 14. That is, one end of the branch side winding 10 and the branch side ground winding 14 is inserted into the through hole 22 from the main surface 17 side to the main surface 19 side, folded back to the other end side of the spectacle core 18, and the other end It is wound around the winding part 26 between the through hole 22 and the other end of the eyeglass core 18 by repeatedly being folded back to the main surface 17 side on the part side and inserted into the through hole 22. The main surface 19 is pulled out. The diameters of the windings 6, 8, 10, 14 are about 1/5 of the diameters of the through holes 20 and 22. As is apparent from FIG. 8, the branch side winding 10 and the branch side ground winding 14 are aligned.

  As described above, the windings 6, 8, 10, and 14 have the same thickness, and a total of four in the through holes 20 around which the main windings 6 and 8 are wound, A total of nine windings are inserted through the through holes 22 around which the windings 10 and 14 are wound. That is, although the number of windings to the through-hole 20 is small, the diameters of the through-holes 20 and 22 are the same. . The through hole 20 has a lot of space, the workability of winding the winding around the through hole 20 is poor, the average magnetic path length is long, the effective magnetic permeability is low, and the characteristics are not good.

  An object of the present invention is to provide a transformer having improved workability in winding work and improved characteristics.

  The transformer of one embodiment of the present invention has a core, and first and second through holes are formed in the core. The area of the second through hole is smaller than that of the first through hole. The first and second through holes may be circular, for example, but may have other shapes, for example, a polygonal shape such as a rectangle or a triangle, or an ellipse or a long hole. You can also. A first winding is provided in the first through hole. A second winding is provided in the second through hole. The number of turns is smaller than that of the first winding. As the first and second windings, circular windings or square windings can be used.

  In the transformer configured as described above, since the area of the second through hole in which the second winding with a small number of turns is provided is smaller than the area of the first through hole, the second winding is connected to the second winding. It can be provided in close contact with the through hole, improving the workability of the winding work, and shortening the average magnetic path length, increasing the effective magnetic permeability and improving the characteristics.

  The first and second windings can be of the same thickness. For example, when circular ones are used for the first and second windings, ones having the same diameter can be used. For example, the first winding is based on the provision of the first through hole having a large area. When the thickness of the transformer is selected, when the winding having the same thickness as that of the second through-hole having a small area is provided, the space in the second through-hole is reduced, and this transformer is mass-produced. In any transformer, the winding interval of the second winding is less likely to vary, and the characteristics of the transformer are also less likely to vary.

  In the core, the first and second through holes may be formed in one core main body with a space therebetween, or the core may be arranged in a substantially contacted manner. And a second core body, and a first through hole may be formed in the first core body, and a second through hole may be formed in the second core body. .

  The first winding may be a grounding winding on the branch side of the branching device. In this case, the second winding is a grounding winding on the main line side of the branching device, and the branching side winding of the branching device having a smaller number of turns than the first winding is also provided in the first through hole. The branch-side winding of the branching device having a smaller number of turns than the second winding is also provided in the second through hole. By configuring in this way, a branching transformer can be configured.

  As described above, according to the present invention, it is possible to improve the workability of the winding operation of the transformer, and to suppress the variation in the characteristics of the manufactured transformer and improve the characteristics.

It is a front view of the branching device using the transformer of one embodiment of the present invention. It is a perspective view of the core used for the branching device of FIG. It is a figure which shows the insertion loss, coupling loss, and reverse coupling loss of the branching device of FIG. 1 and the conventional branching device. It is a figure which shows the input reflection loss, output reflection loss, and branch output reflection loss of the branching device of FIG. 1 and the conventional branching device. It is a perspective view of the modification of the core used for the branching device of FIG. It is a circuit diagram of a branching device. It is a perspective view of the core currently used for the conventional branching device. It is a front view of the conventional branching device.

    A transformer according to an embodiment of the present invention is obtained by implementing the present invention in a branching device, for example, one branching device, and uses a core, for example, an eyeglass core 30 as shown in FIGS. The eyeglass core 30 has a main body 31 formed in, for example, a thick oval shape. The eyeglass core 30 is of the same material and size as the eyeglass core 18 shown in FIGS. The main body 31 of the glasses core 30 has two main surfaces 32 and 34 having the same shape that face each other. First and second through holes, for example, two circular through holes 36 and 38 are formed so as to penetrate between the two main surfaces 32 and 34. The through hole 36 as an example of the first through hole has the same diameter as the through holes 20 and 22 shown in FIGS. The through hole 38 as an example of the second through hole has a diameter smaller than the diameter of the through hole 36, for example, about 1/2.

  Similarly to the through-hole 22, the trunk-side winding 6 and the trunk-side ground winding 8 constituting the one branching device shown in FIG. 7 are wound around the through-hole 38, and the branch-side winding 10 is wound around the through-hole 36. And the branch side grounding winding 14 is wound. The diameters of the windings 6, 8, 10, and 14 are all the same, approximately 1/5 of the diameter of the through hole 36, and approximately 1/3 of the diameter of the through hole 38. The diameters of the windings 6, 8, 10 and 14 are selected on the basis that the windings 10 and 14 can be wound a predetermined number of turns into the through-hole 36 having a large diameter. If the windings 6 and 8 are wound around the through-hole 38, the through-hole 38 has more space, and if one branch device is produced in mass production, the windings 6 and 8 are wound. The line spacing tends to vary from one branching device to another.

  The trunk side winding 6 is inserted into the through hole 38 so as to pass from the main surface 32 side to the main surface 34 side, and the number of turns is 1T. The trunk-side ground winding 8 is inserted so that one end is removed from the main surface 32 side to the main surface 34 side, and one end thereof is folded back to one end side of the main body 31 of the eyeglass core 30 by the main surface 34. In the winding portion 40 between the through hole 38 and one end portion of the main body portion 31 of the spectacle core 30, the main surface 32 is repeatedly folded back to the through hole 38 side and inserted into the through hole 38. It is wound over 3T.

  Similarly, in the through hole 36, one end of each of the branch side winding 10 and the branch side ground winding 14 is inserted so as to pass from the main surface 32 side to the main surface 34 side, and one end thereof is on the main surface 34 side. The eyeglass core 30 is folded back to the other end side of the main body 31, the other end side is passed through the main surface 32, is folded back to the through hole 36 side, and is inserted into the through hole 36. The branch side winding 10 is wound over 2T and the branch side ground winding 14 is wound over 7T at a winding portion 42 between the main body portion 31 of the glasses core 30 and the other end portion.

  The number of turns of the main line side winding 6 and the main line side ground winding 8 wound around the through hole 38 is smaller than the number of turns of the branch side winding 10 and the branch side ground winding 14. Therefore, the diameter of the through hole 38 is made smaller than that of the through hole 36. As a result, the main ground-side ground winding 8 can be easily wound tightly along the circumference of the through hole 38, the workability of the winding work is improved, and variations in the characteristics of one branching device are suppressed. Can do. Moreover, since the diameter of the through hole 38 is small, the average magnetic path length can be shortened, the effective magnetic permeability can be increased, and the characteristics of the single branching device can be improved.

  FIG. 3 shows the insertion loss, coupling loss, and reverse coupling loss of the single branching device shown in FIGS. 1 and 2 and the conventional single branching device shown in FIGS. 7 and 8. The insertion loss of the branching device shown in FIGS. 1 and 2 is indicated by the reference numeral 62, which is the insertion loss of the conventional single branching device shown in FIGS. 7 and 8. There is almost no difference between the two. Reference numeral 64 indicates the coupling loss of the branching device shown in FIGS. 1 and 2, and reference numeral 66 indicates the coupling loss of the conventional one-branching device shown in FIGS. 7 and 8, and the branching shown in FIGS. The coupling loss of the device is slightly smaller than the coupling loss of the conventional single branching device shown in FIGS. Reference numeral 68 indicates the reverse coupling loss of the single branching device shown in FIGS. 1 and 2, and reference numeral 70 indicates the reverse coupling loss of the conventional single branching device. One branching is shown in FIGS. The reverse coupling loss of the device is about 5 dB larger than the reverse coupling loss of the conventional single branching device shown in FIGS.

  FIG. 4 shows the input side reflection loss, the trunk line output side reflection loss, and the branch output side reflection loss of the one branch device shown in FIGS. 1 and 2 and the conventional one branch device shown in FIGS. 7 and 8. Reference numeral 72 indicates the input side reflection loss of the branching device shown in FIGS. 1 and 2, and reference numeral 74 indicates the input side reflection loss of the conventional one branching device shown in FIGS. There is no. Reference numeral 76 indicates the trunk line output side reflection loss of the branching device shown in FIGS. 1 and 2, and reference numeral 78 indicates the trunk line output side reflection loss of the conventional one branching device shown in FIGS. The coupling loss of the branching device shown in FIGS. 1 and 2 is about 3 dB larger than the coupling loss of the conventional one-branching device shown in FIGS. Reference numeral 80 indicates the branch output side reflection loss of the one branching device shown in FIGS. 1 and 2, and reference numeral 82 indicates the branch output side loss of the conventional one branching device. The reverse coupling loss of the single branching device shown is about 5 dB larger than the reverse coupling loss of the conventional single branching device shown in FIGS.

  3 and 4 do not show the characteristics at frequencies exceeding 100 MHz, but even at frequencies exceeding 100 MHz, the insertion loss, coupling loss, reverse coupling loss of the single branching device shown in FIGS. The input side reflection loss, the trunk line output side reflection loss, and the branch output side reflection loss have the same characteristics as those shown in FIGS.

  In the above embodiment, the main body 31 of the eyeglass core 30 is shown as an integral body. However, as shown in FIG. 5, the first main body 31a having a through hole 36 and a through hole 38 are formed. It is also possible to use the second body portion 31b formed separately and arranged so as to contact the first and second body portions 31a and 31b.

  In the above embodiment, the through holes 36 and 38 are circular through holes. However, the present invention is not limited to this. For example, the through holes 36 and 38 may be polygonal through holes such as rectangles and triangles, or elliptical through holes. You can also In the above embodiment, circular windings are used for the windings 6, 8, 10, and 14. However, the present invention is not limited to this. For example, the longitudinal sectional shape in the direction perpendicular to the length direction is used. Rectangular rectangular windings can also be used. In the above embodiment, the thicknesses of the windings 6, 8, 10, and 14 are the same, but the thickness of the winding provided in the through hole 36 and the thickness of the winding provided in the through hole 38 are the same. For example, the thickness of the windings 6 and 8 having a small number of turns can be made larger than the thickness of the windings 10 and 14 having a large number of turns. In the above embodiment, the transformer according to the present invention is used for one branching device. However, the present invention is not limited to this. For example, in a transformer having windings separately wound around two through holes, for example, a high frequency transformer. The present invention can also be implemented when the number of windings wound around one winding is smaller than that of the other winding. In that case, the area of the through hole in which the winding with a small number of turns is wound (the area of the cross section perpendicular to the length direction of the through hole) is the area of the through hole in which the winding with a large number of turns is wound ( Smaller than the area of the cross section perpendicular to the length direction of the through hole).

6 Trunk side winding (first winding)
8 Trunk side ground winding (first winding)
10 Branch side winding (second winding)
14 Branch-side ground winding (second winding)
30 glasses core (core)
31 Core body 36 Through hole (first through hole)
38 Through hole (second through hole)

Claims (5)

A core having a first through hole and a second through hole having a smaller area than the first through hole;
A first winding provided in the first through hole;
A second winding provided in the second through hole and provided with a smaller number of turns than the first winding,
Transformer provided.   2. The transformer according to claim 1, wherein the first and second windings have the same thickness.   2. The transformer according to claim 1, wherein the core has the first and second through-holes formed in a single core main body with a space therebetween.   2. The transformer according to claim 1, wherein the core includes first and second core main body portions disposed substantially in contact with each other, and the first through hole is formed in the first core main body portion. Transformers in which the second through holes are respectively formed in the two core main body portions. 5. The transformer according to claim 1, wherein the first winding is a grounding winding on the branch side of the branching device, and the second winding is a grounding winding on the main line side of the branching device. Thus, the first through hole is also provided with a branch side winding of the branching device having a smaller number of turns than the first winding, and the second through hole has fewer than the second winding. A transformer provided with a main winding of the branching device of the number of turns.

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