JP2010245294A - Three-phase high frequency transformer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a three-phase high frequency transformer which is suitable for a power conversion device and a power supply device. <P>SOLUTION: The three-phase high frequency transformer includes: a ferrite core comprising three columnar cores, a top plate and a bottom plate; and three coils each including a primary coil formed by bending a rectangular wire a plurality of times along the width of the rectangular wire and having a predetermined internal diameter, and a secondary coil formed by bending a rectangular wire differing in width from the rectangular wire along the width of the rectangular wire to have an internal diameter equal to the internal diameter of the primary coil, and arranged so that the rectangular wire constituting the secondary coil is interposed in an interval of the rectangular wire constituting the primary coil, inner peripheries of the primary coil and second coil are aligned with each other, and the columnar cores are inserted into them, wherein at least one of the primary coil and second coil is connected in a Y shape. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a three-phase high-frequency transformer, and more particularly to a three-phase high-frequency transformer suitable for a power conversion device and a power supply device.

Three iron cores, each of which has a parallel cross-sectional unit block with magnetic steel plates of a predetermined width butted together and joined at an angle of 60 degrees so that the circumscribed ship has a substantially circular shape, are equilateral triangles. A triangular-arranged tripod iron core type three-phase transformer has been proposed in which the three iron cores are arranged side by side at the apex and the upper and lower ends of the three iron cores are joined by yokes, respectively (Patent Document 1).
JP-A-9-232164

  However, in high-frequency transformers used in power converters and power supplies, in order to prevent magnetic flux leakage, the secondary winding is wrapped with the primary winding or wound from the primary winding to the secondary winding. In general, a primary winding and a secondary winding are alternately wound, such as a so-called sandwich winding in which a primary winding is wound thereon.

  However, when the above configuration is adopted, the degree of coupling is low and the leakage inductance is large. Therefore, the voltage ratio of the secondary output voltage does not match the turn ratio of the primary winding to the secondary winding, and the load current There was a problem that the secondary output voltage dropped when the current was applied.

  Further, in the high frequency transformer having the above-described configuration, the primary winding and the secondary winding are overlapped, and an insulating material is inserted between the primary winding and the secondary winding. There is also a problem that the current density in the winding and the secondary winding decreases.

  The present invention has been made to solve the above problem, and the voltage ratio of the secondary output voltage is the same as the turn ratio of the primary winding to the secondary winding. An object of the present invention is to provide a high-frequency transformer suitable for a power conversion device and a power supply device, in which a drop in the secondary output voltage is prevented and heat can be prevented from being generated between the primary winding and the secondary winding.

  The invention of claim 1 comprises three cylindrical cores formed of ferrite and arranged at equal intervals on the circumference, a top plate formed of ferrite connecting one end of the cylindrical core, and A bottom plate made of ferrite that connects the other end of the cylindrical core, a primary coil having a predetermined inner diameter formed by bending a flat wire a plurality of times in the width direction of the flat wire, and a width different from the width of the flat wire. And a secondary coil formed by bending a rectangular wire having a width in the width direction of the rectangular wire so that the inner diameter thereof is the same as the inner diameter of the primary coil, and forming a rectangular wire constituting one of the primary coil and the secondary coil A flat wire constituting the other of the primary coil and the secondary coil is interposed in the interval of the wires, and the inner periphery of the primary coil and the inner periphery of the secondary coil are configured to coincide with each other, Inside the cylindrical core Each of the coils arranged to be inserted, and connecting one end of the primary coil among the coils on the top plate side or the bottom plate side, and on the top plate side or the bottom plate side of the secondary coil The present invention relates to a three-phase high-frequency transformer in which one ends are connected.

The invention described in claim 2 includes three cylindrical cores formed of ferrite and arranged at equal intervals on the circumference, and a top plate formed of ferrite connecting one end of the cylindrical core; ,
A bottom plate formed of ferrite connecting the other end of the cylindrical core, a primary coil having a predetermined inner diameter formed by bending a rectangular wire a plurality of times in the width direction of the rectangular wire, and a width different from the width of the rectangular wire And a secondary coil formed by bending a rectangular wire in the width direction of the rectangular wire so that the inner diameter is the same as the inner diameter of the primary coil, and constitutes one of the primary coil and the secondary coil A flat wire constituting the other of the primary coil and the secondary coil is interposed in the interval of the flat wire, and the inner periphery of the primary coil and the inner periphery of the secondary coil are configured to coincide with each other. Three coils arranged so that each of the cylindrical cores is inserted into each of the coils, and one end on the top plate side of one of the primary coils and the bottom plate side of the other primary coil Connect the other end of the front One end of the other primary coil on the top plate side is connected to the other end of the other primary coil on the bottom plate side, and one of the other primary coils on the top plate side and any one of the above The present invention relates to a three-phase high-frequency transformer that connects the other end of the primary coil on the bottom plate side and connects one end of the secondary coil on the top plate side or the bottom plate side of the coil.

  According to a third aspect of the present invention, there are provided three cylindrical cores formed of ferrite and arranged at equal intervals on the circumference, a top plate formed of ferrite connecting one end of the cylindrical core, and A bottom plate made of ferrite that connects the other end of the cylindrical core, a primary coil having a predetermined inner diameter formed by bending a flat wire a plurality of times in the width direction of the flat wire, and a width different from the width of the flat wire. And a secondary coil formed by bending a rectangular wire having a width in the width direction of the rectangular wire so that the inner diameter thereof is the same as the inner diameter of the primary coil, and forming a rectangular wire constituting one of the primary coil and the secondary coil A flat wire constituting the other of the primary coil and the secondary coil is interposed in the interval of the wires, and the inner periphery of the primary coil and the inner periphery of the secondary coil are configured to coincide with each other, Inside the cylindrical core Each of the coils arranged to be inserted, and connecting one end of the top side or the bottom side of the primary coil of the coil, and the top side of any secondary coil of the coil The present invention relates to a three-phase high-frequency transformer in which one end of the other is connected to the other end of the other primary coil on the bottom plate side.

  In the three-phase high-frequency transformer according to claim 1, since both the primary coil and the secondary coil are Y-connected, each interphase voltage becomes 1 / √3 with respect to the primary connection voltage and the secondary connection voltage. Since the number of turns of the primary coil and the secondary coil wound around each of the three columnar cores is also 1 / √3, the size can be reduced and high power can be handled.

  The three-phase high-frequency transformer according to claim 2 is suitable as a step-up transformer because the primary coil is Δ-connected and the secondary coil is Y-connected. In addition, when harmonics are included in the input, the harmonics circulate through the Δ-connected primary coil, so that there is an advantage that harmonics are not mixed with the output wave.

  In the three-phase harmonic transformer according to claim 3, since the primary coil is Y-connected and the secondary coil is Δ-connected, the output of the secondary coil is suitable as a transformer for low voltage and high power. Further, as in the case of the three-phase high-frequency transformer according to claim 2, when harmonics are included in the input, since the harmonics circulate through the secondary coil connected in Δ, the harmonics are not mixed with the output wave. There is also.

FIG. 1 is a plan view showing the configuration of the three-phase high-frequency transformer according to the first embodiment. FIG. 2 is a side view showing the configuration of the three-phase high-frequency transformer according to the first embodiment. FIG. 3 is a bottom view showing the configuration of the three-phase high-frequency transformer according to the first embodiment. FIG. 4 is a plan view showing the configuration of the three-phase high-frequency transformer according to the second embodiment. FIG. 5 is a side view showing the configuration of the three-phase high-frequency transformer according to the second embodiment. FIG. 6 is a bottom view showing the configuration of the three-phase high-frequency transformer according to the second embodiment. FIG. 7 is a plan view showing the configuration of the three-phase high-frequency transformer according to the third embodiment. FIG. 8 is a side view showing the configuration of the three-phase high-frequency transformer according to the third embodiment. FIG. 9 is a bottom view showing the configuration of the three-phase high-frequency transformer according to the third embodiment. FIG. 10 is a plan view showing the configuration of the three-phase high-frequency transformer according to the fourth embodiment. FIG. 11 is a side view showing the configuration of the three-phase high-frequency transformer according to the fourth embodiment. FIG. 12 is a bottom view showing the configuration of the three-phase high-frequency transformer according to the fourth embodiment. FIG. 13 is a side view showing the configuration of the three-phase high-frequency transformer according to the fifth embodiment. FIG. 14 is a bottom view of the three-phase high-frequency transformer according to the fifth embodiment when viewed from the back side of the printed circuit board. FIG. 15 is a plan view illustrating a configuration of a three-phase high-frequency transformer according to the sixth embodiment. FIG. 16 is a side view showing the configuration of the three-phase high-frequency transformer according to the sixth embodiment. FIG. 17 is a bottom view showing the configuration of the three-phase high-frequency transformer according to the sixth embodiment. FIG. 18 is a plan view showing the configuration of the three-phase high-frequency transformer according to the seventh embodiment. FIG. 19 is a side view showing the configuration of the three-phase high-frequency transformer according to the seventh embodiment. FIG. 20 is a plan view showing the configuration of the three-phase high-frequency transformer according to the eighth embodiment. FIG. 21 is a side view showing the configuration of the three-phase high-frequency transformer according to the eighth embodiment. FIG. 22 is a bottom view showing the configuration of the three-phase high-frequency transformer according to the ninth embodiment. FIG. 23 is a side view showing the configuration of the three-phase high-frequency transformer according to the ninth embodiment. FIG. 24 is a bottom view showing the configuration of the three-phase high-frequency transformer according to the tenth embodiment. FIG. 25 is a side view showing the configuration of the three-phase high-frequency transformer according to the tenth embodiment. FIG. 26 is a side view showing the configuration of the three-phase high-frequency transformer according to the eleventh embodiment. FIG. 27 is a bottom view of the three-phase high-frequency transformer according to the eleventh embodiment as viewed from the back side of the printed board. FIG. 28 is a plan view showing the configuration of the three-phase high-frequency transformer according to the twelfth embodiment. FIG. 29 is a side view showing the configuration of the three-phase high-frequency transformer according to the twelfth embodiment. FIG. 30 is a plan view showing the configuration of the three-phase high-frequency transformer according to the thirteenth embodiment. FIG. 31 is a side view showing the configuration of the three-phase high-frequency transformer according to the thirteenth embodiment. FIG. 32 is a plan view showing the configuration of the three-phase high-frequency transformer according to the fourteenth embodiment. FIG. 33 is a side view showing the configuration of the three-phase high-frequency transformer according to the fourteenth embodiment. FIG. 34 is a plan view showing the configuration of the three-phase high-frequency transformer according to the fifteenth embodiment. FIG. 35 is a side view showing the configuration of the three-phase high-frequency transformer according to the fifteenth embodiment. FIG. 36 is a plan view showing the configuration of the three-phase high-frequency transformer according to the sixteenth embodiment. FIG. 37 is a side view showing the configuration of the three-phase high-frequency transformer according to the sixteenth embodiment. FIG. 38 is a side view showing the configuration of the three-phase high-frequency transformer according to the seventeenth embodiment. FIG. 39 is a bottom view of the three-phase high-frequency transformer according to the seventeenth embodiment when viewed from the back side of the printed board. FIG. 40 is a plan view showing the configuration of the three-phase high-frequency transformer according to the eighteenth embodiment. FIG. 41 is a side view showing the configuration of the three-phase high-frequency transformer according to the eighteenth embodiment.

1. Embodiment 1
In the three-phase high-frequency transformer of the present invention, an example in which both the primary coil and the secondary coil are Y-connected will be described below.

  A three-phase high-frequency transformer 100 according to the first embodiment is obtained by winding a primary coil 11, 12, 13 and a secondary coil 21, 22, 23 around a tripod ferrite core 5 as shown in FIGS. .

  As shown in FIGS. 1 to 3, the tripod ferrite core 5 connects the columnar core 5A formed of three ferrites arranged on the circumference at intervals of 120 degrees and the upper ends of the three columnar cores 5A. A plate-shaped top plate 5B formed of ferrite and a bottom plate 5C formed of ferrite for connecting the lower ends of the three columnar cores 5A are provided.

  In the tripod ferrite core 5, the columnar core 5 </ b> A can be divided into two vertically along a plane orthogonal to the axis thereof, and the upper half is integrated with the top plate 5 </ b> B and the lower half is integrated with the bottom plate 5 </ b> C. Further, instead of dividing the columnar core 5A into two vertically, one of the top plate 5B and the bottom plate 5C and the columnar core 5A are integrally formed, and the other of the top plate 5B and the bottom plate 5C is formed so as to be separable from the columnar core 5A. May be.

  The top plate 5B and the bottom plate 5C have equilateral triangular planar shapes in which the vertices are rounded and the sides swell outward in an arc shape. A bolt insertion hole 6 is provided at the center, and a fixing bolt 8 is inserted through the bolt insertion hole 6. Further, a bolt insertion groove 7 is provided at the center of each side, and a fixing bolt 8 is also inserted into the bolt insertion groove 7. However, the fixing bolt 8 that is inserted into the bolt insertion groove 7 is omitted. A nut 10 is screwed onto the tip of the fixing bolt 8, whereby the upper half and the lower half of the tripod ferrite core 5 are firmly fastened.

  Three legs 9 for fixing the three-phase high-frequency transformer 100 to the substrate are provided on the bottom surface of the bottom plate 5C.

  As shown in FIGS. 1 to 3, one of the three columnar cores 5 </ b> A has a primary coil 11 and a secondary coil 21, and the other one has a primary coil 12 and a secondary coil 22. In addition, a primary coil 13 and a secondary coil 23 are inserted into another one.

  The primary coil 11 and the secondary coil 21, the primary coil 12 and the secondary coil 22, and the primary coil 13 and the secondary coil 23 are all formed by winding the rectangular wire clockwise as viewed from above and edgewise. Has been.

  The primary coil 11 and the secondary coil 21 are arranged such that a rectangular wire constituting the secondary coil 21 is interposed in a gap between the rectangular wires constituting the primary coil 11, in other words, a rectangular wire constituting the primary coil 11. The rectangular wires constituting the secondary coil 21 are arranged alternately. Further, the primary coil 11 has more turns than the secondary coil 21. Therefore, the secondary coil 21 is inserted into the central portion of the primary coil 11, and there are portions where the secondary coil 21 is not inserted into both ends of the primary coil 11. Therefore, since the high-frequency current output from the secondary coil 21 is a high voltage current lower than the high-frequency current input to the primary coil 11, the rectangular wire forming the secondary coil 21 forms the primary coil 1. The flat wire and thickness are the same but wide. Instead of using a rectangular wire having a width wider than that of the primary coil 11 in the secondary coil 21, a thick rectangular wire may be used. The primary coil 11 and the secondary coil 21 have the same inner diameter and are arranged so that their inner circumferences coincide. Further, the inner diameters of the primary coil 11 and the secondary coil 21 are larger than the outer diameter of the columnar core 5 </ b> A by providing a gap for inserting an insulator.

  Similarly, the primary coil 12 and the secondary coil 22 constitute the primary coil 12 so that the rectangular wire constituting the secondary coil 22 is interposed in the gap between the rectangular wires constituting the primary coil 12. The flat wire and the flat wire constituting the secondary coil 22 are alternately arranged. Further, the primary coil 12 has more turns than the secondary coil 22. Accordingly, the secondary coil 22 is inserted into the central portion of the primary coil 12, and there are portions where the secondary coil 22 is not inserted into both ends of the primary coil 12. Therefore, since the high-frequency current output from the secondary coil 22 is a large current having a lower voltage than the high-frequency current input to the primary coil 12, the rectangular wire constituting the secondary coil 22 constitutes the primary coil 12. The flat wire and thickness are the same but wide. Instead of using a rectangular wire having a width wider than that of the primary coil 12 in the secondary coil 22, a thick rectangular wire may be used. The primary coil 12 and the secondary coil 22 have the same inner diameter and are arranged so that their inner circumferences coincide. Further, the inner diameters of the primary coil 12 and the secondary coil 22 are larger than the outer diameter of the columnar core 5 </ b> A by providing a gap for inserting an insulator.

  Similarly, the primary coil 13 and the secondary coil 23 constitute the primary coil 13 such that the rectangular wire constituting the secondary coil 23 is interposed in the gap between the rectangular wires constituting the primary coil 13. The flat wire and the flat wire constituting the secondary coil 23 are alternately arranged. Further, the primary coil 13 has more turns than the secondary coil 23. Therefore, the secondary coil 23 is inserted into the central portion of the primary coil 13, and there are portions where the secondary coil 23 is not inserted into both ends of the primary coil 13. Therefore, since the high-frequency current output from the secondary coil 23 is lower in voltage and larger than the high-frequency current input to the primary coil 13, the rectangular wire constituting the secondary coil 23 constitutes the primary coil 13. The flat wire and thickness are the same but wide. Instead of using a rectangular wire having a width wider than that of the primary coil 13 in the secondary coil 23, a thick rectangular wire may be used. The primary coil 13 and the secondary coil 23 have the same inner diameter and are arranged so that their inner circumferences coincide. Further, the inner diameters of the primary coil 13 and the secondary coil 23 are larger than the outer diameter of the columnar core 5 </ b> A by providing a gap for inserting an insulator.

  In the primary coils 11, 12, 13, the winding start portion is drawn to the outside of the primary coils 11, 12, 13 to become lead wires 11 A, 12 A, 13 A, and the winding end portion is also the primary coil 11, 12. , 13 are drawn out to lead lines 11B, 12B, 13B.

  Similarly, the winding start portions of the secondary coils 21, 22, 23 are drawn to the outside of the secondary coils 21, 22, 23 to become lead wires 21A, 22A, 23A, and the winding end portions are also secondary windings. The lead wires 21B, 22B, and 23B are drawn out to the outside of the coils 21, 22, and 23.

  In the primary coils 11, 12, and 13, the lead wires 11 </ b> B, 12 </ b> B, and 13 </ b> B are all electrically connected to the connection piece 30 that is bent horizontally and has a plate-like conductor having a donut-like planar shape. ing. Similarly, in the secondary coils 21, 22, and 23, the lead wires 21 </ b> B, 22 </ b> B, and 23 </ b> B are all electrically bent to the connecting piece 31 that is bent horizontally and has a plate-like conductor having a donut-like planar shape. Connected. Accordingly, the primary coils 11, 12, 13 and the secondary coils 21, 22, 23 are all Y-connected.

  On the other hand, the lead wires 11A, 12A, 13A of the primary coils 11, 12, 13 are connected to the U-phase, V-phase, and W-phase on the input side, respectively, and the lead wires 21A, 22A of the secondary coils 21, 22, 23, 23A is connected to the U-phase, V-phase, and W-phase on the output side, respectively.

  Hereinafter, the operation of the three-phase high-frequency transformer 100 will be described. In the three-phase high-frequency transformer 100, when a three-phase high-frequency current having a predetermined voltage, current, and frequency is applied to the lead wires 11A, 12A, and 13A, the U-phase, the V-phase, and the W-phase are Three-phase high-frequency currents, which are voltages and currents corresponding to the turns ratio of the secondary coil 21, primary coil 12 and secondary coil 22, and primary coil 13 and secondary coil 23, are output to the lead wires 21A, 22A, and 23A. .

  In the three-phase high-frequency transformer 100, the upper half of the columnar core 5A and the top plate 5B, and the lower half of the columnar core 5A and the bottom plate 5C are integrally formed, and the upper half and the lower half of the tripod ferrite core 5 are formed. Respectively. And since the upper half part and lower half part of the tripod ferrite core 5 are firmly fastened by the fixing bolt 8 inserted into the bolt insertion hole 6 and the bolt insertion groove 7, the columnar core 5A and the top plate 5B An air gap is not formed between the bottom plate 5C and between the upper half and the lower half of the columnar core 5A, and an increase in iron loss due to the presence of the air gap can be effectively suppressed.

  Further, the primary coils 11, 12, 13 and the secondary coils 21, 22, 23 are arranged so that the inner diameters are equal and the inner circumferences coincide with each other, so that the primary coils 11, 12, 13 and the secondary coils 21 are arranged. , 22, 23 and the columnar core 5A are narrow, so that high conversion efficiency can be achieved even when used at a high frequency.

  Further, since the primary coils 11, 12, 13 and the secondary coils 21, 22, 23 are all Y-connected, the primary coils 11, 12, 13 and the secondary coils 21, 22, 23 are both primary The interphase voltage is 1 / √3 with respect to the line voltage and the secondary line voltage, respectively, and the primary coils 11, 12, 13 and the secondary coils 21, 22, 23 wound around the columnar core 5A are also 1/3 respectively. Since √3 is reduced, a three-phase high-frequency transformer that can be miniaturized and can handle a large amount of power is provided.

2. Embodiment 2
A second example in which both the primary coil and the secondary coil of the three-phase high-frequency transformer of the present invention are Y-connected will be described below.

  In the three-phase high-frequency transformer 102 according to the second embodiment, as shown in FIGS. 4 to 6, the connection in the first embodiment is used as a connection member for connecting the lead wires 11 </ b> B, 12 </ b> B, 13 </ b> B of the primary coils 11, 12, 13. Instead of the member 30, the secondary coil 21 is formed by using a connecting member 40 made of a plate-like conductor, having a triangular outer periphery rounded at each vertex, and having an opening similar to the outer periphery in the center. The lead wires 21B, 22B, and 23B of the first, second, and third parts are made of a plate-like conductor, and are connected by a connection member 41 that has the same planar shape as the connection member 40. The configuration is the same as that of the transformer 100. The operation is also the same.

3. Embodiment 3
In the three-phase high-frequency transformer of the present invention, a third example in which both the primary coil and the secondary coil are Y-connected will be described below.

  In the three-phase high-frequency transformer 104 according to the third embodiment, unlike the three-phase high-frequency transformer 100 of the first embodiment and the three-phase high-frequency transformer 102 of the second embodiment, as shown in FIGS. The ends of the lead wires 11B, 12B, 13B of 12 and 13 are not bent in the vertical direction but are connected by the connecting member 50 in the vicinity of the top plate 5B while being in the state of the end of winding. Similarly, the ends of the lead wires 21B, 22B, and 23B of the secondary coils 21, 22, and 23 are also connected by the connecting member 51 in the vicinity of the floor plate 5C without being bent in the vertical direction and in the state where the winding ends. Has been.

  Each of the connecting members 50 and 51 is made of a plate-like conductor, has a triangular outer periphery with rounded vertices, and an opening having a shape similar to the outer periphery is provided at the center. However, the connection members 50 and 51 are located outside the top plate 5B or the bottom plate 5C, respectively.

  Further, the three-phase high-frequency transformer 104 does not have the leg portion 9, but instead the bottom plate 5C is directly placed on the substrate, and the fixing bolt 8 is screwed into a screw hole provided on the substrate. Therefore, the nut 10 for fastening the upper half part and the lower half part of the tripod ferrite core 5 becomes unnecessary.

  In addition to the features of the three-phase high-frequency transformer 100 of the first embodiment and the three-phase high-frequency transformer 102 of the second embodiment, the three-phase high-frequency transformer 104 includes the lead wires 11B, 12B, 13B, and two of the primary coils 11, 12, 13 Since the post-processing of the lead wires 21B, 22B, and 23B of the next coils 21, 22, and 23 can be greatly simplified, and the nut 10 that is screwed to the fixing bolt 8 can be omitted, the overall configuration itself Also has a feature that can be simplified.

4). Embodiment 4
A fourth example in which both the primary coil and the secondary coil of the three-phase high-frequency transformer of the present invention are Y-connected will be described below.

  In the three-phase high-frequency transformer 106 according to the fourth embodiment, unlike the three-phase high-frequency transformer 100 according to the first embodiment and the three-phase high-frequency transformer 102 according to the second embodiment, as shown in FIGS. The ends of the lead wires 11B, 12B, 13B of 12 and 13 are bent upward and are connected by a connecting member 60 in the vicinity of the top plate 5B. On the other hand, the ends of the lead wires 21B, 22B, and 23B of the secondary coils 21, 22, and 23 are bent downward and connected by a connecting member 61 in the vicinity of the floor plate 5C.

  The connection members 60 and 61 have a triangular planar shape with rounded vertices, and are formed by bending a conductor band plate into the shape. The connection members 60 and 61 are located outside the top plate 5B or the bottom plate 5C, respectively.

  Further, the three-phase high-frequency transformer 106 does not have the leg portion 9, but instead the bottom plate 5C is placed directly on the substrate, and the fixing bolt 8 is screwed into a screw hole provided on the substrate. Therefore, the nut 10 for fastening the upper half part and the lower half part of the tripod ferrite core 5 becomes unnecessary.

  Since the three-phase high-frequency transformer 106 can omit the nut 10 screwed to the fixing bolt 8, the overall configuration itself can be simplified, and the connection members 60 and 61 can be formed by bending a conductor band plate. Therefore, it has the feature that manufacture is easy compared with the connection members 50 and 51 which need to be pulled out by a press or the like.

5). Embodiment 5
A fifth example in which both the primary coil and the secondary coil of the three-phase high-frequency transformer of the present invention are Y-connected will be described below.

  In the three-phase high-frequency transformer 108 according to the fifth embodiment, as shown in FIGS. 13 and 14, the ends of the lead wires 11B, 12B, 13B of the primary coils 11, 12, 13 and the secondary coils 21, 22, 23 The ends of the leader lines 21B, 22B, and 23B are bent downward. The leader lines 11B, 12B, and 13B are inserted into an opening 73 provided in the printed board 70, and the leader lines 21B, 22B, and 23B are inserted into an opening 74 provided in the printed board 70. Here, in the portion where the opening 73 is formed on the back surface of the printed circuit board 70, the conductor pattern 71 is formed so as to connect the three openings 73, and the portion where the opening 74 is formed on the surface of the printed circuit board 70. The conductor pattern 72 is formed so as to connect the three openings 74. The lead wires 11B, 12B, and 13B are soldered to the conductor pattern 71 at the opening 73, and the lead wires 21B, 22B, and 23B are soldered to the conductor pattern 72 at the opening 74. Accordingly, the lead lines 11B, 12B, and 13B are connected by the conductor pattern 71, and the lead lines 21B, 22B, and 23B are connected by the conductor pattern 72.

  The fixing bolt 8 is inserted into a hole provided in the printed circuit board 70, and the nut 10 is screwed from the back side of the printed circuit board 70.

  The three-phase high-frequency transformer 108 is the same as the three-phase high-frequency transformer 100 of the first embodiment with respect to the configuration of the tripod ferrite core 5, the primary coils 11, 12, 13 and the secondary coils 21, 22, 23, and the like.

  The three-phase high-frequency transformer 108 has a feature that it can be easily mounted on the printed circuit board 70 in addition to the feature of the three-phase high-frequency transformer 100 of the first embodiment.

6). Embodiment 6
A sixth example in which both the primary coil and the secondary coil of the three-phase high-frequency transformer of the present invention are Y-connected will be described below.

  In the three-phase high-frequency transformer 110 according to the sixth embodiment, as shown in FIGS. 15 to 17, the ends of the lead wires 11 </ b> B, 12 </ b> B, 13 </ b> B of the primary coils 11, 12, 13 are upward, and the secondary coils 21, 22 are. , 23 lead ends 21B, 22B, 23B are bent downward and connected by connection members 80, 81 having a substantially triangular shape. Each of the connection members 80 and 81 has a triangular shape with ridges protruding outward. The connection member 80 is connected to the lead lines 11B, 12B, and 13B by bending the tips of the ridges downward. Are connected to the lead lines 21B, 22B, and 23B with the tips of the ridges bent upward.

  The three-phase high-frequency transformer 110 has the same configuration as the three-phase high-frequency transformer 100 of the first embodiment except for the above points.

7). Embodiment 7
Of the three-phase high-frequency transformer of the present invention, an example in which the primary coil is Δ-connected and the secondary coil is Y-connected will be described below.

  In the three-phase high-frequency transformer 112 according to the seventh embodiment, as shown in FIGS. 18 and 19, the primary coils 11, 12, and 13 are all formed by winding up a rectangular wire from the bottom to the top. Are leader lines 11A, 12A, and 13A, respectively, and ends of winding are leader lines 11B, 12B, and 13B, respectively.

  The lead wires 11A, 12A, and 13A on the winding start side are bent upward, and the ends thereof are substantially the same height as the lead wires 11B, 12B, and 13B on the winding end side. The lead wire 11B on the winding end side of the primary coil 11 is the lead wire 13A on the winding start side of the primary coil 13, and the lead wire 13B on the winding end side of the primary coil 13 is the lead wire 12A on the winding start side of the primary coil 12. Further, the lead wire 12B on the winding end side of the primary coil 12 is connected to the lead wire 11A on the winding start side of the primary coil 11. And the connection part of leader line 11B and leader line 13A, the connection part of leader line 13B and leader line 12A, and the connection part of leader line 12B and leader line 11A are the U phase on the input side, the V phase, respectively. Connected to W phase. Therefore, the primary coils 11, 12, and 13 are Δ-connected.

  On the other hand, the secondary coils 21, 22, and 23 are formed by rolling up a flat winding wider than the primary coils 11, 12, and 13 from the bottom to the top, and the winding start portions are the lead wires 21A, 22A, 23A, and the winding end portions are the leader lines 21B, 22B, and 23B, respectively.

  The lead wires 21B, 22B, and 23B on the winding end side are each bent upward and further bent horizontally so as to face inward at the end portion and connected to the connecting member 30. The connection member 30 is as described in the first embodiment.

  On the other hand, the lead wires 21A, 22A, 23A on the winding start side are connected to the U phase, V phase, and W phase on the output side, respectively. Therefore, the secondary coils 21, 22, and 23 are Y-connected.

  Except for the above points, the three-phase high-frequency transformer 110 has the same configuration as the three-phase high-frequency transformer 100 of the first embodiment.

  Also in the three-phase high frequency transformer 110, the upper half of the columnar core 5A and the top plate 5B, and the lower half of the columnar core 5A and the bottom plate 5C are integrally formed, and the upper half and the lower half of the tripod ferrite core 5 are formed. Respectively. And since the upper half part and lower half part of the tripod ferrite core 5 are firmly fastened by the fixing bolts 8 inserted into the bolt insertion holes 6 and the bolt insertion grooves 7, the columnar core 5A and the top plate 5B Since no air gap is formed between the bottom plate 5C and between the upper half and the lower half of the columnar core 5A, an increase in iron loss due to the presence of the air gap can be effectively suppressed.

  Further, the primary coils 11, 12, 13 and the secondary coils 21, 22, 23 are arranged so that the inner diameters are equal and the inner circumferences coincide with each other, so that the primary coils 11, 12, 13 and the secondary coils 21 are arranged. , 22, 23 and the columnar core 5A are narrow, so that high conversion efficiency can be achieved even when used at a high frequency.

  Further, since the primary coils 11, 12, and 13 are Δ-connected and the secondary coils 21, 22, and 23 are Y-connected, the three-phase high-frequency transformer 110 is suitable as a step-up transformer. In addition, when harmonics are included in the input, the harmonics circulate through the primary coils 11, 12, and 13 that are Δ-connected, so that there is an advantage that harmonics are not mixed with the output waves.

8). Embodiment 8
Of the three-phase high-frequency transformer of the present invention, a second example in which the primary coil is Δ-connected and the secondary coil is Y-connected will be described below.

  In the three-phase high-frequency transformer 114 according to the eighth embodiment, as shown in FIGS. 20 and 21, the connection member for connecting the lead wires 21 </ b> B, 22 </ b> B, 23 </ b> B of the secondary coils 21, 22, 23 is used in the seventh embodiment. Instead of the connection member 30, except that a connection member 40 made of a plate-like conductor has a triangular outer periphery rounded at each vertex and an opening similar to the outer periphery is provided in the central portion is used. The configuration is the same as that of the three-phase high-frequency transformer 112 of the seventh embodiment. The operation is also the same.

9. Embodiment 9
Of the three-phase high-frequency transformer of the present invention, a third example in which the primary coil is Δ-connected and the secondary coil is Y-connected will be described below.

  In the three-phase high-frequency transformer 116 according to the ninth embodiment, unlike the three-phase high-frequency transformer 112 according to the seventh embodiment and the three-phase high-frequency transformer 114 according to the eighth embodiment, as shown in FIGS. The ends of the lead wires 21B, 22B, and 23B of the wires 22 and 23 are also connected by the connecting member 50 in the vicinity of the floor plate 5C without being bent in the vertical direction and in a state where the winding ends.

  Each of the connecting members 50 is made of a plate-like conductor, has a triangular outer periphery with rounded vertices, and an opening having a shape similar to the outer periphery is provided at the center. However, the connecting member 50 is located outside the bottom plate 5C.

  Further, the three-phase high-frequency transformer 116 does not have the leg portion 9, but instead, the bottom plate 5 </ b> C is directly placed on the substrate, and the fixing bolt 8 is screwed into a screw hole provided in the substrate. Therefore, the nut 10 for fastening the upper half part and the lower half part of the tripod ferrite core 5 becomes unnecessary.

  The three-phase high-frequency transformer 116 includes a tripod ferrite core 5, primary coils 11, 12, 13, and secondary coils 21, 22, 23, and lead wires 11 A, 11 B, 12 A, 12 B of the primary coils 11, 12, 13. , 13A, and 13B are connected in the same manner as the three-phase high-frequency transformer 112 of the seventh embodiment.

  In addition to the features of the three-phase high-frequency transformer 112 of the seventh embodiment and the three-phase high-frequency transformer 114 of the eighth embodiment, the three-phase high-frequency transformer 116 is provided after the lead wires 21B, 22B, 23B of the secondary coils 21, 22, 23. There is a feature that the processing can be greatly simplified, and further, since the nut 10 screwed to the fixing bolt 8 can be omitted, the overall configuration itself can be simplified.

10. Embodiment 10
Of the three-phase high-frequency transformer of the present invention, a fourth example in which the primary coil is Δ-connected and the secondary coil is Y-connected will be described below.

  The three-phase high-frequency transformer 118 according to the tenth embodiment is different from the three-phase high-frequency transformer 112 according to the seventh embodiment and the three-phase high-frequency transformer 114 according to the eighth embodiment, as shown in FIGS. , 22 and 23, the ends of the leader lines 21B, 22B and 23B are bent downward and connected by a connecting member 60 in the vicinity of the floor plate 5C.

  The three-phase high-frequency transformer 118 includes a tripod ferrite core 5, primary coils 11, 12, 13, and secondary coils 21, 22, 23, and lead wires 11 A, 11 B, 12 A, 12 B of the primary coils 11, 12, 13. , 13A, and 13B are connected in the same manner as the three-phase high-frequency transformer 112 of the seventh embodiment.

  The connecting member 60 has a triangular planar shape with rounded vertices, and is formed by bending a conductor strip into the shape. The connecting member 60 is located outside the bottom plate 5C.

  Further, the three-phase high-frequency transformer 118 does not have the leg portion 9, but instead the bottom plate 5C is placed directly on the substrate, and the fixing bolt 8 is screwed into a screw hole provided on the substrate. Therefore, the nut 10 for fastening the upper half part and the lower half part of the tripod ferrite core 5 becomes unnecessary.

  Since the three-phase high-frequency transformer 118 can omit the nut 10 screwed to the fixing bolt 8 and can simplify the overall configuration itself, the connection member 60 can be formed by bending a conductor strip. Compared with the connecting member 50 that needs to be punched out by a press or the like, there is also a feature that manufacture is easy.

11. Embodiment 11
Of the three-phase high-frequency transformer of the present invention, a fifth example in which the primary coil is Δ-connected and the secondary coil is Y-connected will be described below.

  In the three-phase high-frequency transformer 120 according to the eleventh embodiment, as shown in FIGS. 26 and 27, the ends of the lead wires 21B, 22B, and 23B of the secondary coils 21, 22, and 23 are bent downward, and the printed circuit board 70 is bent. Is inserted into an opening 73 provided in the. Here, a conductor pattern 71 is formed on the back surface of the printed circuit board 70 where the opening 73 is formed so as to connect the three openings 73. The lead wires 21B, 22B, and 23B are soldered to the conductor pattern 71 at the opening 73. Thus, the lead lines 21B, 22B, and 23B are connected by the conductor pattern 71.

  The fixing bolt 8 is inserted into a hole provided in the printed circuit board 70, and the nut 10 is screwed from the back side of the printed circuit board 70.

  The three-phase high-frequency transformer 120 includes a tripod ferrite core 5, primary coils 11, 12, 13, and secondary coils 21, 22, 23, and lead wires 11 A, 11 B, 12 A, 12 B of the primary coils 11, 12, 13. , 13A, and 13B are connected in the same manner as the three-phase high-frequency transformer 112 of the seventh embodiment.

  The three-phase high-frequency transformer 120 has a feature that it can be easily mounted on the printed circuit board 70 in addition to the feature of the three-phase high-frequency transformer 112 of the seventh embodiment.

12 Embodiment 12
Of the three-phase high-frequency transformer of the present invention, a sixth example in which the primary coil is Δ-connected and the secondary coil is Y-connected will be described below.

  In the three-phase high-frequency transformer 122 according to the twelfth embodiment, as shown in FIGS. 28 and 29, the ends of the lead wires 21B, 22B, and 23B of the secondary coils 21, 22, and 23 are bent downward, respectively, and substantially triangular. It is connected by a connecting member 80 having a shape. The connecting member 80 has a triangular shape with a ridge protruding outward, and the tip of the ridge is bent downward and connected to the lead lines 21B, 22B, and 23B.

  The three-phase high-frequency transformer 122 has the same configuration as the three-phase high-frequency transformer 112 of the seventh embodiment except for the above points.

13. Embodiment 13
Of the three-phase high-frequency transformer of the present invention, an example in which the primary coil is Y-connected and the secondary coil is Δ-connected will be described below.

  In the three-phase high-frequency transformer 124 according to the thirteenth embodiment, as shown in FIGS. 30 and 31, the primary coils 11, 12, and 13 are all formed by winding a rectangular wire from the bottom to the top, Are leader lines 11A, 12A, and 13A, respectively, and ends of winding are leader lines 11B, 12B, and 13B, respectively.

  The lead wires 11B, 12B, 13B on the winding end side are each bent upward and further bent horizontally so as to face inward at the end portion and connected to the connecting member 30. The connection member 30 is as described in the first embodiment.

  On the other hand, the lead wires 11A, 12A, 13A on the winding start side are connected to the U phase, V phase, and W phase on the input side, respectively. Therefore, the primary coils 11, 12, and 13 are Y-connected.

  On the other hand, the secondary coils 21, 22, and 23 are formed by rolling up a flat winding wider than the primary coils 11, 12, and 13 from the bottom to the top, and the winding start portions are the lead wires 21A, 22A, 23A, and the winding end portions are the leader lines 21B, 22B, and 23B, respectively.

  The lead wires 21A, 22A, 23A on the winding start side are bent upward, and the ends thereof are substantially the same height as the lead wires 21B, 22B, 23B on the winding end side. The lead wire 21B on the winding end side of the secondary coil 21 is the lead wire 23A on the winding start side of the secondary coil 23, and the lead wire 23B on the winding end side of the secondary coil 23 is the winding start side of the secondary coil 22. The lead wire 22B on the winding end side of the secondary coil 22 is connected to the lead wire 21A on the winding start side of the secondary coil 21. And the connection part of leader line 21B and leader line 23A, the connection part of leader line 23B and leader line 22A, and the connection part of leader line 22B and leader line 21A are the U phase, V phase on the output side, respectively. Connected to W phase. Therefore, the secondary coils 21, 22, and 23 are Δ-connected.

  Except for the above points, the three-phase high-frequency transformer 124 has the same configuration as the three-phase high-frequency transformer 100 of the first embodiment.

  Also in the three-phase high-frequency transformer 124, the upper half of the columnar core 5A and the top plate 5B, and the lower half of the columnar core 5A and the bottom plate 5C are integrally formed, and the upper half and the lower half of the tripod ferrite core 5 are formed. Respectively. And since the upper half part and lower half part of the tripod ferrite core 5 are firmly fastened by the fixing bolts 8 inserted into the bolt insertion holes 6 and the bolt insertion grooves 7, the columnar core 5A and the top plate 5B Since no air gap is formed between the bottom plate 5C and between the upper half and the lower half of the columnar core 5A, an increase in iron loss due to the presence of the air gap can be effectively suppressed.

  Further, the primary coils 11, 12, 13 and the secondary coils 21, 22, 23 are arranged so that the inner diameters are equal and the inner circumferences coincide with each other, so that the primary coils 11, 12, 13 and the secondary coils 21 are arranged. , 22, 23 and the columnar core 5A are narrow, so that high conversion efficiency can be achieved even when used at a high frequency.

  Further, since the primary coils 11, 12, and 13 are Y-connected and the secondary coils 21, 22, and 23 are Δ-connected, the three-phase high-frequency transformer 124 is suitable as a high-power transformer. In addition, when harmonics are included in the input, the harmonics circulate through the secondary coils 21, 22, and 23 that are Δ-connected, so that the harmonics are not mixed with the output waves.

14 Embodiment 14
A second example of the three-phase high-frequency transformer of the present invention in which the primary coil is Y-connected and the secondary coil is Δ-connected will be described below.

  In the three-phase high-frequency transformer 126 according to the fourteenth embodiment, as shown in FIGS. 32 and 33, the connection in the thirteenth embodiment is used as a connection member that connects the lead wires 11B, 12B, and 13B of the primary coils 11, 12, and 13. Instead of the member 30, it is composed of a plate-shaped conductor, has a triangular outer periphery with rounded vertices, and uses a connection member 40 having an opening similar to the outer periphery provided at the center, The configuration is the same as that of the three-phase high-frequency transformer 124 of the thirteenth embodiment. The operation is also the same.

15. Embodiment 15
Of the three-phase high-frequency transformer of the present invention, a third example in which the primary coil is Y-connected and the secondary coil is Δ-connected will be described below.

  In the three-phase high-frequency transformer 128 according to the fifteenth embodiment, unlike the three-phase high-frequency transformer 124 of the thirteenth embodiment and the three-phase high-frequency transformer 126 of the fourteenth embodiment, as shown in FIGS. The ends of the lead wires 11B, 12B, 13B of 12 and 13 are not bent in the vertical direction but are connected by the connecting member 50 in the vicinity of the top plate 5B in the state of the end of winding.

  Each of the connecting members 50 is made of a plate-like conductor, has a triangular outer periphery with rounded vertices, and an opening having a shape similar to the outer periphery is provided at the center. However, the connection member 50 is located outside the top plate 5B.

  Further, the three-phase high-frequency transformer 128 does not have the leg portion 9, but instead the bottom plate 5C is directly placed on the substrate, and the fixing bolt 8 is screwed into a screw hole provided on the substrate. Therefore, the nut 10 for fastening the upper half part and the lower half part of the tripod ferrite core 5 becomes unnecessary.

  The three-phase high-frequency transformer 128 includes a tripod ferrite core 5, primary coils 11, 12, 13, and secondary coils 21, 22, 23, and lead wires 21A, 21B, 22A of the secondary coils 21, 22, 23, The connection of 22B, 23A, and 23B is the same as that of the three-phase high-frequency transformer 124 of the thirteenth embodiment.

  In addition to the features of the three-phase high-frequency transformer 128, the three-phase high-frequency transformer 124 of the thirteenth embodiment, and the three-phase high-frequency transformer 126 of the fourteenth embodiment, post-processing of the lead wires 11B, 12B, 13B of the primary coils 11, 12, 13 It has the feature that it can be greatly simplified. Further, since the nut 10 screwed to the fixing bolt 8 can be omitted, the overall configuration itself can be simplified.

16. Embodiment 16
Of the three-phase high-frequency transformer of the present invention, a fourth example in which the primary coil is Y-connected and the secondary coil is Δ-connected will be described below.

  In the three-phase high-frequency transformer 130 according to the sixteenth embodiment, unlike the three-phase high-frequency transformer 124 of the thirteenth embodiment and the three-phase high-frequency transformer 126 of the fourteenth embodiment, as shown in FIGS. The ends of the lead wires 11B, 12B, 13B of 12 and 13 are bent upward and are connected by a connecting member 60 in the vicinity of the top plate 5B.

  The three-phase high-frequency transformer 130 includes a tripod ferrite core 5, primary coils 11, 12, 13, and secondary coils 21, 22, 23, and lead wires 21 A, 21 B, 22 A of the secondary coils 21, 22, 23. Connections of 22B, 23A, and 23B are the same as those of the three-phase high-frequency transformer 124 of the thirteenth embodiment.

  The connecting member 60 has a triangular planar shape with rounded vertices, and is formed by bending a conductor strip into the shape. The connecting member 60 is located outside the bottom plate 5C.

  Further, the three-phase high-frequency transformer 130 does not have the leg portion 9, and instead, the bottom plate 5 </ b> C is directly placed on the substrate, and the fixing bolt 8 is screwed into a screw hole provided in the substrate. Therefore, the nut 10 for fastening the upper half part and the lower half part of the tripod ferrite core 5 becomes unnecessary.

  Since the three-phase high-frequency transformer 130 can omit the nut 10 screwed to the fixing bolt 8, the overall configuration itself can be simplified, and the connecting member 60 can be formed by bending a conductor band plate. Compared with the connecting member 50 that needs to be punched out by a press or the like, there is also a feature that manufacture is easy.

17. Embodiment 17
Of the three-phase high-frequency transformer of the present invention, a fifth example in which the primary coil is Y-connected and the secondary coil is Δ-connected will be described below.

  In the three-phase high-frequency transformer 132 according to the seventeenth embodiment, as shown in FIGS. 38 and 39, the ends of the lead wires 11B, 12B, and 13B of the primary coils 11, 12, and 13 are bent downward to form the printed circuit board 70. It is inserted into the provided opening 73. Here, a conductor pattern 71 is formed on the back surface of the printed circuit board 70 where the opening 73 is formed so as to connect the three openings 73. The lead wires 11B, 12B, and 13B are soldered to the conductor pattern 71 at the opening 73. Thus, the lead wires 11B, 12B, and 13B are connected by the conductor pattern 71.

  The fixing bolt 8 is inserted into a hole provided in the printed circuit board 70, and the nut 10 is screwed from the back side of the printed circuit board 70.

  The three-phase high-frequency transformer 132 includes a tripod ferrite core 5, primary coils 11, 12, 13, and secondary coils 21, 22, 23, and lead wires 21A, 21B, 22A of the secondary coils 21, 22, 23, Connections of 22B, 23A, and 13B are the same as those of the three-phase high-frequency transformer 124 of the thirteenth embodiment.

  The three-phase high-frequency transformer 132 has a feature that it can be easily mounted on the printed circuit board 70 in addition to the feature of the three-phase high-frequency transformer 124 of the thirteenth embodiment.

18. Embodiment 18
Of the three-phase high-frequency transformer of the present invention, a sixth example in which the primary coil is Y-connected and the secondary coil is Δ-connected will be described below.

  In the three-phase high-frequency transformer 134 according to the eighteenth embodiment, as shown in FIGS. 40 and 41, the ends of the lead wires 11B, 12B, and 13B of the primary coils 11, 12, and 13 are bent upward, and each has a substantially triangular shape. The connection member 80 is connected. The connecting member 80 has a triangular shape with a ridge protruding outward, and the tip of the ridge is bent downward and connected to the lead lines 11B, 12B, and 13B.

  The three-phase high-frequency transformer 134 has the same configuration as the three-phase high-frequency transformer 124 of the thirteenth embodiment except for the above points.

5 Tripod ferrite core 5A Columnar core 5B Top plate 5C Bottom plate 6 Bolt insertion hole 7 Bolt insertion groove 8 Fixing bolt 10 Nut 11 Primary coil 12 Primary coil 13 Primary coil 11A Lead wire 11B Lead wire 12A Lead wire 12B Lead wire 13B Lead wire 13B Lead wire 13A Lead wire 21 Secondary coil 21A Lead wire 21B Lead wire 22 Secondary coil 22A Lead wire 22B Lead wire 23 Secondary coil 23A Lead wire 23B Lead wire 30 Connection member 31 Connection member 40 Connection member 41 Connection member 50 Connection member 51 Connection member 60 connecting member 61 connecting member 70 printed circuit board 71 conductor pattern 72 conductor pattern 73 opening 74 opening 80 connecting member 81 connecting member

Claims (3)

Three cylindrical cores formed of ferrite and arranged at equal intervals on the circumference;
A top plate formed of ferrite connecting one end of the cylindrical core;
A bottom plate formed of ferrite connecting the other end of the cylindrical core;
A primary coil having a predetermined inner diameter formed by bending a flat wire in the width direction of the flat wire a plurality of times, and a flat wire having a width different from the width of the flat wire is bent in the width direction of the flat wire so that the inner diameter is A secondary coil formed so as to be the same as the inner diameter of the primary coil, and the other of the primary coil and the secondary coil is placed within the interval of a rectangular wire constituting one of the primary coil and the secondary coil. A rectangular wire is interposed, and the inner periphery of the primary coil and the inner periphery of the secondary coil are configured to coincide with each other, and each of the cylindrical cores is inserted into each of the cylindrical cores. Three coils,
With
A three-phase high-frequency transformer in which one end on the top plate side or bottom plate side of the primary coil of the coil is connected to each other and one end on the top plate side or bottom plate side of the secondary coil is connected to each other. Three cylindrical cores formed of ferrite and arranged at equal intervals on the circumference;
A top plate formed of ferrite connecting one end of the cylindrical core;
A bottom plate formed of ferrite connecting the other end of the cylindrical core;
A primary coil having a predetermined inner diameter formed by bending a flat wire in the width direction of the flat wire a plurality of times, and a flat wire having a width different from the width of the flat wire is bent in the width direction of the flat wire so that the inner diameter is A secondary coil formed so as to be the same as the inner diameter of the primary coil, and the other of the primary coil and the secondary coil is placed within the interval of a rectangular wire constituting one of the primary coil and the secondary coil. A rectangular wire is interposed, and the inner periphery of the primary coil and the inner periphery of the secondary coil are configured to coincide with each other, and each of the cylindrical cores is inserted into each of the cylindrical cores. Three coils,
With
One end of one of the primary coils on the top plate side is connected to the other end of the other primary coil on the bottom plate side, and one other end of the other primary coil on the top plate side is connected to another one. Connecting the other end on the bottom plate side of one primary coil, connecting one end on the top plate side of the further one primary coil and the other end on the bottom plate side of any one of the primary coils, A three-phase high-frequency transformer in which one end of the top or bottom plate of the secondary coil is connected. Three cylindrical cores formed of ferrite and arranged at equal intervals on the circumference;
A top plate formed of ferrite connecting one end of the cylindrical core;
A bottom plate formed of ferrite connecting the other end of the cylindrical core;
A primary coil having a predetermined inner diameter formed by bending a flat wire in the width direction of the flat wire a plurality of times, and a flat wire having a width different from the width of the flat wire is bent in the width direction of the flat wire so that the inner diameter is A secondary coil formed so as to be the same as the inner diameter of the primary coil, and the other of the primary coil and the secondary coil is placed within the interval of a rectangular wire constituting one of the primary coil and the secondary coil. A rectangular wire is interposed, and the inner periphery of the primary coil and the inner periphery of the secondary coil are configured to coincide with each other, and each of the cylindrical cores is inserted into each of the cylindrical cores. Three coils,
With
One end on the top plate side or bottom plate side of the primary coil in the coil is connected to each other, and one end on the top plate side of any secondary coil of the coil and the other end on the bottom plate side of the other primary coil Connected three-phase high-frequency transformer.

Images