JP2010074132A - Core for high-frequency transformer and high-frequency transformer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a core for high-frequency transformer, which can form the high-frequency transformer for three-phase AC suitable for large power usage, and to provide the high-frequency transformer using the core for high-frequency transformer. <P>SOLUTION: The core for high-frequency transformer includes: three cylindrical columnar cores formed by three ferrites arranged on the circumference at intervals of 120 degrees; a top plate formed by a ferrite connecting one end sides of the three columnar cores; a bottom plate formed by a ferrite connecting the other end sides of the three columnar cores, wherein both of the top plate and the bottom plate have the planar shape of a right triangle, each side of which swells outside in an arc or have that of a circle, a bolt insertion hole into which a fixing bolt for tightening the three columnar cores, the top plate and the bottom plate is inserted is made at the center part of the top plate and the bottom plate, and the bolt insertion hole into which the fixing bolt is inserted is formed at a middle point of each side of the top plate and the bottom plate. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a high-frequency transformer core and a high-frequency transformer, and more particularly to a high-frequency transformer core used for a high-frequency transformer suitable for a power conversion device and a power supply device, and a high-frequency transformer including the high-frequency transformer core.

  Three iron cores each having a cross section of parallelograms laminated with magnetic steel plates of a predetermined width are joined together at an angle of 60 degrees and their outer tangent lines are formed into a substantially circular shape. 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, since the three-phase transformer described in Patent Document 1 uses a core in which insulated silicon steel plates are laminated in the thickness direction, there is too much iron loss at high frequencies, and it is for three-phase AC use. It is not practical as a high-frequency transformer.

  The present invention is a high-frequency transformer core capable of forming a high-frequency transformer for three-phase AC, which can handle a large power, and can be used as a power supply device for a large-capacity metal halide lamp, a large-capacity DC sputtering power supply device, and a power conversion device. It is an object of the present invention to provide a high-frequency transformer using the high-frequency transformer core.

The invention described in claim 1 is formed of a columnar columnar core formed of three ferrites arranged on the circumference at intervals of 120 degrees, and a ferrite connecting one end side of the three columnar cores. A bottom plate made of ferrite that connects the other end sides of the three columnar cores,
Each of the top plate and the bottom plate has a regular triangular or circular plane shape in which each side bulges outward in an arc shape, and a fixing bolt that fastens the three columnar cores, the top plate, and the bottom plate A bolt insertion hole through which the bolt is inserted is formed in the center of the top plate and the bottom plate, and a bolt insertion groove through which the fixing bolt is inserted is formed at a midpoint of each side of the top plate and the bottom plate, or the bolt The present invention relates to a high-frequency transformer core in which insertion holes are formed in the vicinity of the center of each side of the center portion of the top plate and the bottom plate and the peripheral portion of the top plate and the bottom plate.

  According to a second aspect of the present invention, in the high-frequency transformer core according to the first aspect, the top plate and the bottom plate are connected by an arc whose center is the vertex of each equilateral triangle and whose radius is one side of the equilateral triangle. Or a plane shape of a regular triangle that is an arc shape in which each side bulges outward from the ruler triangle.

  Since the high-frequency transformer core is entirely made of ferrite, heat generation of the core can be suppressed in the high-frequency transformer using the high-frequency transformer core. Further, since the cross-sectional area of the columnar core and the area surrounded by the inner diameters of the primary coil and the secondary coil can be made substantially equal, the high-frequency transformer has high conversion efficiency.

  The high-frequency transformer is used as a three-phase high-frequency transformer by Y-connecting or Δ-connecting a primary coil and a secondary coil inserted into each columnar core, respectively. When phase alternating current is input, an alternating magnetic field is generated on the top and bottom plates. In particular, when the three-phase alternating current is a high frequency, the alternating magnetic field preferentially passes through the peripheral portions of the top plate and the bottom plate.

  In the high-frequency transformer core, each of the top plate and the bottom plate has an equilateral triangle or circular planar shape in which each side bulges outward in an arc shape. Compared with a high-frequency transformer having a straight equilateral triangle shape, the magnetic field can rotate more smoothly.

  Further, the top plate, the columnar core, and the bottom plate are firmly fastened by the bolts inserted through the bolt insertion holes or bolt insertion grooves provided in the top plate and the bottom plate, and are in close contact with each other. Therefore, generation | occurrence | production of the loss by the leakage magnetic flux resulting from the clearance gap between a top plate, a columnar core, and a baseplate can be prevented.

  According to a third aspect of the present invention, in the high-frequency transformer core according to the first or second aspect, one or both of the first connecting member and the second connecting member and the columnar core are integrally formed. Related to what is.

  In the high-frequency transformer core, since one or both of the first and second connecting members and the columnar core are integrally formed, the first and second connecting members and the columnar core are In addition, the magnetic resistance between the columnar core and the first and second connecting members is small as compared with the high-frequency transformer core that is combined and formed as a separate body.

  According to a fourth aspect of the present invention, in the high-frequency transformer core according to the first or second aspect, each of the columnar cores is divided into two by a plane orthogonal to the axis, and one of the two divided columnar cores and the first The present invention relates to one connecting member, and one in which the other of the two divided columnar cores and the second connecting member are integrally formed.

  In the high-frequency transformer core, the first connecting member and one of the two divided columnar cores are integrally formed, and the second connecting member and the other of the two divided columnar cores are integrally formed. Therefore, the columnar core and the first and second cores are compared with the high-frequency transformer core in which the first and second connecting members and the columnar core are both formed separately and then combined. There is little magnetic resistance between connecting members.

  Moreover, after inserting one columnar core integral with the first connecting member into the primary and secondary coils prepared in advance, the other columnar core integral with the second connecting member is used as the primary and secondary coils. By inserting, a high-frequency transformer for three-phase AC can be configured.

  The invention according to claim 5 is the primary coil and the secondary coil wound around each of the high-frequency transformer core according to any one of claims 1 to 4 and the columnar core of the high-frequency transformer core. And a high frequency transformer.

  In the high-frequency transformer core used in the high-frequency transformer, the columnar core is formed of ferrite. Therefore, heat generation of the columnar core can be suppressed in the high-frequency transformer. Further, since the cross-sectional area of the columnar core and the area surrounded by the inner diameters of the primary coil and the secondary coil can be made substantially equal, the high-frequency transformer has high conversion efficiency.

  According to a sixth aspect of the present invention, in the high-frequency transformer according to the fifth aspect, the primary coil and the secondary coil are formed by bending a rectangular wire in the width direction thereof and winding it around the columnar core. And the secondary coil is disposed such that a rectangular wire forming the other of the primary coil and the secondary coil is interposed in a gap of a rectangular wire forming one of the primary coil and the secondary coil. About.

  In the high-frequency transformer, since rectangular wires are used for the primary coil and the secondary coil, unlike the case where round wires are used, eddy currents are generated inside the primary coil and the secondary coil to ignite the high-frequency transformer. Is effectively prevented.

  In addition, since the rectangular wire constituting the primary coil and the rectangular wire constituting the secondary coil are alternately arranged, the primary coil and the secondary coil are arranged side by side, or the secondary coil is arranged inside the primary coil. Compared with the arranged high frequency transformer, the degree of coupling between the primary coil and the secondary coil is high, and the magnetic flux leakage is small.

  The invention described in claim 7 is the high-frequency transformer according to claim 6, wherein the rectangular wire forming the primary coil and the rectangular wire forming the secondary coil are different from each other in at least one of width and thickness. About.

  In the high frequency transformer, since the rectangular wire of the primary coil and the rectangular wire of the secondary coil are different in at least one of width and thickness, for example, the current flowing through the secondary coil is the current of the primary coil. Is larger than the primary coil, and conversely, if the current flowing through the primary coil is larger than the current of the secondary coil, the primary coil is made wider than the primary coil. The width and thickness of the rectangular wire can be set in accordance with the current flowing through the primary coil and the secondary coil so that at least one of the width and thickness of the rectangular wire of the coil is wider than that of the secondary coil.

  According to the first and second aspects of the present invention, since the magnetic resistance between the top plate and the bottom plate and the columnar core is small, the heat generation when high frequency is applied is small, the conversion efficiency is high, and the large-capacity metal halide. A high-frequency transformer core capable of forming a three-phase AC high-frequency transformer suitable for a lamp power supply, a large-capacity DC sputtering power supply, and a power conversion device is provided.

  According to the third aspect of the present invention, there is provided a high-frequency transformer core capable of constituting a high-frequency transformer for three-phase alternating current, which further generates less heat and has high conversion efficiency.

  According to the invention described in claim 4, since the magnetic resistance between the first and second connecting members and the columnar core is small, the heat generation when applying a high frequency is small, and the conversion efficiency is high. In addition, a high-frequency transformer core that can be easily mounted on a columnar core of primary and secondary coils is provided.

  According to the fifth aspect of the present invention, there is provided a high-frequency transformer core that can form a high-frequency transformer with particularly high conversion efficiency with almost no gap between the columnar core and the primary and secondary coils.

  According to the invention of claim 6, since the heat generation of the columnar core when high frequency is applied is small and the conversion efficiency is high, it is suitable for a power supply device for a large capacity metal halide lamp, a large capacity DC sputtering power supply device, and a power conversion device. A high-frequency transformer for three-phase AC is provided.

  According to the invention of claim 7, since the degree of coupling between the primary coil and the secondary coil is high and the magnetic flux leakage is small, the voltage ratio of the secondary output voltage is the same as the turn ratio between the primary winding and the secondary winding. Therefore, a drop in the secondary output voltage when a load current is passed can be prevented, and heat can be prevented from flowing between the primary winding and the secondary winding. A high-frequency transformer suitable for a large-capacity DC sputtering power supply device and a power conversion device is provided.

  According to the invention of claim 8, according to the invention of claim 3, a high frequency transformer adapted to various different input / output conditions is provided.

FIG. 1 is a side view showing the configuration of the high-frequency transformer core according to the first embodiment. FIG. 2 is a plan view illustrating the configuration of the high-frequency transformer core according to the first embodiment. FIG. 3 is a perspective view showing a configuration of the high-frequency transformer core according to Embodiment 1 in which a columnar core is formed so as to be split into two. FIG. 4 is a perspective view showing a configuration of the high-frequency transformer core according to Embodiment 1 in which the top plate and the columnar core are formed so as to be separable. FIG. 5 is a side view showing the configuration of the high-frequency transformer core according to the second embodiment. FIG. 6 is a plan view showing the configuration of the high-frequency transformer core according to the second embodiment. FIG. 7 is a perspective view illustrating a configuration of a high-frequency transformer core according to Embodiment 2 in which a columnar core is formed so as to be split into two. FIG. 8 is a perspective view showing a configuration of a high frequency transformer core according to Embodiment 2 in which a top plate and a columnar core are formed so as to be separable. FIG. 9 is an explanatory diagram showing the flow of a magnetic field in the top plate and the bottom plate of the high-frequency transformer core according to the second embodiment. FIG. 10 is a side view illustrating the configuration of the high-frequency transformer core according to the third embodiment. FIG. 11 is a plan view showing the configuration of the high-frequency transformer core according to the third embodiment. FIG. 12 is a perspective view showing the overall configuration of the high-frequency transformer core according to the third embodiment. FIG. 13 is a perspective view illustrating a configuration of a high-frequency transformer core according to Embodiment 3 in which a columnar core is formed so as to be split into two. FIG. 14 is a perspective view showing a configuration of a high frequency transformer core according to Embodiment 3 in which a top plate and a columnar core are formed so as to be separable. FIG. 15 is an explanatory diagram showing that the top plate and the bottom plate of the high-frequency transformer core according to the third embodiment have a triangular plane shape of a rouleau. FIG. 16 is an explanatory diagram showing the flow of a magnetic field in the top plate and the bottom plate of the high-frequency transformer core according to the third embodiment. FIG. 17 is a side view illustrating the configuration of the high-frequency transformer core according to the fourth embodiment. FIG. 18 is a plan view showing the configuration of the high-frequency transformer core according to the fourth embodiment. FIG. 19 is a perspective view illustrating a configuration of a high-frequency transformer core according to Embodiment 4 in which a columnar core is formed so as to be split into two. FIG. 20 is a perspective view showing a configuration of a high frequency transformer core according to Embodiment 4 in which a top plate and a columnar core are formed so as to be separable. FIG. 21 is a side view showing the configuration of the high-frequency transformer core according to the fifth embodiment. FIG. 22 is a plan view showing the configuration of the high-frequency transformer core according to the fifth embodiment. FIG. 23 is a perspective view illustrating a configuration of a high-frequency transformer core according to Embodiment 5 in which a columnar core is formed so as to be split into two. FIG. 24 is a perspective view showing a configuration of a high-frequency transformer core according to Embodiment 5 in which a top plate and a columnar core are formed so as to be separable. FIG. 25 is a side view showing the configuration of the high-frequency transformer according to the sixth embodiment. FIG. 26 is a plan view illustrating a configuration of a high-frequency transformer according to the sixth embodiment. FIG. 27 is a side view showing the high-frequency transformer according to the sixth embodiment fixed to a substrate with fixing bolts.

1. Embodiment 1

  The high-frequency transformer core 10 according to the first embodiment corresponds to the three columnar cores 1 made of ferrite and the first connecting member, as shown in FIGS. 1 and 2. A top plate 2 that connects the columnar core 1 at its upper end and a bottom plate 3 that corresponds to a second connecting member and connects the three columnar cores 1 at its lower end.

  The columnar cores 1 are arranged on the circumference at intervals of 120 degrees, in other words, arranged so as to occupy each vertex of an equilateral triangle.

  The top plate 2 and the bottom plate 3 are plate-shaped members that are equilateral triangles that are congruent to each other, have a planar shape with rounded vertices, and are formed of ferrite. The columnar core 1 is disposed at each apex of the top plate 2 and the bottom plate 3. Bolt insertion holes 4 and 5 through which fixing bolts are inserted are formed in the central portions of the top plate 2 and the bottom plate 3.

  As shown in FIG. 3, the columnar core 1 can be formed so that it can be divided into two in the vertical direction on a plane orthogonal to the axis. When the columnar core 1 is formed so that it can be divided into two vertically, the upper columnar core 1 </ b> A, which is the upper half of the two divided columnar cores 1, is formed integrally with the top plate 2 to constitute the upper half 6. The lower columnar core 1 </ b> B, which is a lower side crack, is formed integrally with the bottom plate 3 to form the lower half 7. Then, the upper half core 6 and the lower half 7 are joined so that the upper columnar core 1A and the lower columnar core 1B meet at the dividing surface 1C, whereby the core for a high frequency transformer of the form shown in FIGS. 10 is configured. In order to fix the upper half 6 and the lower half 7 to each other, the bolt insertion hole 4 of the top plate 2 and the bolt insertion hole 5 of the bottom plate 3 in a state where the upper half 6 and the lower half 7 are coupled. The upper half portion 6 and the lower half portion 7 are fastened with the fixing bolts through fixing bolts (not shown), or the upper half portion on the split surface 1C between the upper columnar core 1A and the lower columnar core 1B. 6 and the lower half 7 are bonded together.

  Instead of dividing the columnar core 1 into two vertically, as shown in FIG. 4, the columnar core 1 and one of the top plate 2 or the bottom plate 3 are integrally formed, and the other of the top plate 2 or the bottom plate 3 is formed as a columnar core. 1 may be separable. In the example shown in FIG. 4, the columnar core 1 and the bottom plate 3 are integrally formed so that the top plate 2 can be separated. Instead of making one of the top plate 2 and the bottom plate 3 separable from the columnar core 1, the top plate 2, the bottom plate 3, and the columnar core 1 may be integrally formed.

  In the high-frequency transformer core 10, a primary coil and a secondary coil are wound around each of the three columnar cores 1 to provide a high-frequency transformer for three-phase AC.

2. Embodiment 2

  In the high-frequency transformer core 20 according to the second embodiment, as shown in FIGS. 5 and 6, the top plate 2 and the bottom plate 3 are disk-shaped plate members having the same diameter. The three columnar cores 1 are arranged on the outer peripheral portions of the top plate 2 and the bottom plate 3 so as to occupy each vertex of the equilateral triangle at intervals of 120 degrees, in other words. The top plate 2 and the bottom plate 3 are provided with four bolt insertion holes 4 and 5 in total, one at the center and three at positions between the columnar cores 1 at the periphery.

  As shown in FIG. 7, the columnar core 1 can be formed so that it can be divided into two in the vertical direction on a plane orthogonal to the axis. In the case where the columnar core 1 is formed so as to be split into two vertically, the upper columnar core 1A, which is an upper side crack of the two divided columnar cores 1, is formed integrally with the top plate 2 to form the upper half 6. A lower columnar core 1 </ b> B, which is a lower side crack, is formed integrally with the bottom plate 3 to form a lower half 7.

  Instead of dividing the columnar core 1 into two vertically, the columnar core 1 and one of the top plate 2 or the bottom plate 3 are integrally formed as shown in FIG. 8, and the other of the top plate 2 or the bottom plate 3 is formed as a columnar core. 1 may be separable. In the example shown in FIG. 8, the columnar core 1 and the bottom plate 3 are integrally formed so that the top plate 2 can be separated. Instead of making one of the top plate 2 and the bottom plate 3 separable from the columnar core 1, the top plate 2, the bottom plate 3, and the columnar core 1 may be integrally formed.

  In the form of FIG. 7 that can be divided into an upper half 6 and a lower half 7, the upper half 6 and the lower half 7 are arranged so that the upper columnar core 1A and the lower columnar core 1B meet at the dividing plane 1C. The upper half 6 and the lower half 7 are fastened to the bolt insertion holes 4 of the top plate 2 and the bolt insertion holes 5 of the bottom plate 3 through the fixing bolts (not shown) with the fixing bolts. Thus, the high-frequency transformer core 20 is formed.

  On the other hand, in the form of FIG. 8 in which the three columnar cores 1 are formed integrally with one of the top plate 2 and the bottom plate 3, the bolts are placed with the other of the top plate 2 and the bottom plate 3 butted against the end face of the columnar core 1. By fixing the columnar core 1, the top plate 2, and the bottom plate 3 with the fixing bolts through the fixing holes (not shown) through the insertion holes 4 and the bolt insertion holes 5, the high-frequency transformer core 20 is integrated. It is formed.

  When a bolt made of a magnetic material is used as the fixing bolt, an alternating current is induced in the fixing bolt by passing an alternating magnetic field through the fixing bolt, which heats and melts the fixing bolt. It is preferably made of a magnetic material.

  In a three-phase high-frequency transformer in which a primary coil and a secondary coil are fitted and inserted into each of the three columnar cores 1 of the high-frequency transformer core 20, and the primary coil and the secondary coil are respectively Y-connected or Δ-connected, When a high-frequency three-phase alternating current is passed through the secondary coil, an alternating magnetic field is generated on the top plate 2 and the bottom plate 3 as shown by a two-dot chain line in FIG. The alternating magnetic field tends to flow around the peripheral portions of the top plate 2 and the bottom plate 3.

  Here, in the high-frequency transformer core 20, the top plate 2 and the bottom plate 3 are both disk-shaped, and thus compared with the high-frequency transformer core 10 of the first embodiment in which the top plate 2 and the bottom plate 3 are in the shape of a regular triangle. Thus, the degree to which the alternating magnetic field is bent from the original trajectory is small. Therefore, the problem of heat generation due to bending of the alternating magnetic field is small.

  Further, by inserting and fixing the fixing bolts to the bolt insertion holes 4 and 5, the columnar core 1, the top plate 2 and the bottom plate 3 are brought into close contact with each other, so that the columnar core 1, the top plate 2 and the bottom plate are integrated. Loss due to a gap between the two and the third can be minimized.

  Further, the bolt insertion holes 4 and 5 are provided at the center and the peripheral part of the top plate 2 and the bottom plate 3, respectively, but the magnetic field hardly passes through the central part of the top plate 2 and the bottom plate 3, and Since the bolt insertion holes 4 and 5 are overwhelmingly smaller than the portion through which the alternating magnetic field passes, the flow of the alternating magnetic field is hardly inhibited by the bolt insertion holes 4 and 5.

3. Embodiment 3

  As shown in FIGS. 11 and 12, the high-frequency transformer core 30 according to the third embodiment has a substantially equilateral triangular plate shape in which the top plate 2 and the bottom plate 3 are swelled in an arc shape toward the outer sides. The bolt insertion holes 4 and 5 for inserting the fixing bolts are formed in the central portion, and the bolt insertion grooves 8 and 9 for inserting the fixing bolts are provided in the central portions of the three sides. It has been.

  As shown in FIG. 15, each of the top plate 2 and the bottom plate 3 is a circular arc with each side centering on each vertex Ap of the equilateral triangle Eq indicated by a two-dot chain line and the radius being one side r of the equilateral triangle. It has a triangular plane shape of the configured rouleau. Note that the top portions of the top plate 2 and the bottom plate 3 have roundness matched to the outer peripheral surface of the columnar core 1.

  Similarly to the high-frequency transformer core according to the first embodiment, as shown in FIGS. 10, 12, and 13, the columnar core 1 is vertically divided into two, an upper columnar core 1A and a lower columnar core 1B. It may be possible. As shown in FIG. 14, the columnar core may be formed integrally with the top plate 2 or the bottom plate 3. Furthermore, instead of making one of the top plate 2 and the bottom plate 3 separable from the columnar core 1, the top plate 2, the bottom plate 3, and the columnar core 1 may be integrally formed.

  In the high-frequency transformer core 30, as shown in FIGS. 10, 12, and 13, the columnar core 1 can be divided into two parts in the bolt insertion hole 4, the bolt insertion groove 8, and the bottom plate 3. The fixing bolt can be inserted into the bolt insertion hole 5 and the bolt insertion groove 9 to fasten the upper half 6 and the lower half 7 of the columnar core 30 on the dividing surface 1C.

  On the other hand, as shown in FIG. 14, when the top plate 2 or the bottom plate 3 and the columnar core 1 are separable, the bolt insertion holes 4 and the bolt insertion grooves 8 in the top plate 2 and the bolt insertion holes 5 in the bottom plate 3. The columnar core 1 and the top plate 2 or the columnar core 1 and the bottom plate 3 may be fastened by inserting a fixing bolt into the bolt insertion groove 9.

  In a three-phase high-frequency transformer in which a primary coil and a secondary coil are fitted and inserted into each of the three columnar cores 1 of the high-frequency transformer core 30, and the primary coil and the secondary coil are respectively Y-connected or Δ-connected, When a high-frequency three-phase alternating current is passed through the secondary coil, an alternating magnetic field is generated on the top plate 2 and the bottom plate 3 as shown by a two-dot chain line in FIG. The alternating magnetic field tends to flow around the peripheral portions of the top plate 2 and the bottom plate 3.

  Here, in the high-frequency transformer core 30, the top plate 2 and the bottom plate 3 are both in the form of a Rouleau triangle, and each side has an arc shape that bulges outward, so that the top plate 2 and the bottom plate 3 are equilateral triangles. Compared with the high-frequency transformer core 10 of the first embodiment having a shape, the degree to which the alternating magnetic field is bent from the original locus is small. Therefore, the problem of heat generation due to bending of the alternating magnetic field is small.

  Further, by inserting and fixing the fixing bolts to the bolt insertion holes 4 and 5, the columnar core 1, the top plate 2 and the bottom plate 3 are brought into close contact with each other, so that the columnar core 1, the top plate 2 and the bottom plate are integrated. Loss due to a gap between the two and the third can be minimized.

  Further, the bolt insertion holes 4 and 5 are provided in the center portions of the top plate 2 and the bottom plate 3, respectively, and the bolt insertion grooves 8 and 9 are provided in the outer peripheral portion, but the center portions of the top plate 2 and the bottom plate 3 are provided. Since the bolt insertion grooves 8 and 9 are overwhelmingly smaller than the portion through which the alternating magnetic field passes in the outer peripheral portion, the bolt insertion holes 4 and 5 block the flow of the alternating magnetic field. There is little to do. In addition, since the fixing bolts can be attached to the bolt insertion grooves 8 and 9 from the outside, the fastening with the fixing bolt is much easier than the high frequency transformer core of the second embodiment.

4). Embodiment 4

  In the high-frequency transformer core 40 according to the fourth embodiment, as shown in FIGS. 17 and 18, the top plate 2 and the bottom plate 3 are formed in a rectangular shape having the same dimensions. And one of the three columnar cores 1 is at the center of one long side of the top plate 2 and the bottom plate, and the other two are near the both ends of the other long side at intervals of 120 degrees, In other words, it is arranged so as to occupy each vertex of the equilateral triangle.

  The bolt insertion holes 4 and 5 are formed in the vicinity of both ends of one long side of the top plate 2 and the bottom plate 3 and in the central part of the other long side, respectively.

  The high-frequency transformer core 40 is the same as the high-frequency transformer core according to the first embodiment except for the above points.

  Similarly to the high-frequency transformer core according to the first embodiment, as shown in FIG. 19, the columnar core 1 may be divided vertically into two, an upper columnar core 1A and a lower columnar core 1B. As shown in FIG. 20, the columnar core may be formed integrally with the top plate 2 or the bottom plate 3.

5. Embodiment 5

  As shown in FIGS. 21 and 22, the high-frequency transformer core 50 according to the fifth embodiment is a top plate in which the three columnar cores 1 each having a square cross-sectional shape with rounded vertices are hexagonal in plan view. 2 and the peripheral edge of the bottom plate 3 are arranged at intervals of 120 degrees, in other words, so as to occupy each vertex of an equilateral triangle. The top plate 2 and the bottom plate 3 are formed so that the three sides on the side where the columnar core 1 is provided are shorter than the three sides sandwiched between the two columnar cores 1 at both ends.

  The high frequency transformer core 50 is the same as the high frequency transformer core according to the first embodiment except for the above points.

  Similarly to the high-frequency transformer core according to the first embodiment, as shown in FIG. 23, the columnar core 1 may be divided into two parts, that is, an upper columnar core 1A and a lower columnar core 1B. Further, as shown in FIG. 24, the columnar core may be formed integrally with the top plate 2 or the bottom plate 3.

6). Embodiment 6

  An example of the high frequency transformer according to the present invention will be described below.

  The high frequency transformer 100 according to the sixth embodiment is formed on each of the high frequency transformer core 30 according to the third embodiment and the three columnar cores 1 in the high frequency transformer core 30 as shown in FIGS. A primary coil 11 and a secondary coil 12 are provided. 25 and 26, the same reference numerals as those in FIGS. 10 to 16 denote the same components as those shown in FIGS.

  Each of the primary coil 11 and the secondary coil 12 is formed by winding a rectangular wire in a clockwise direction when viewed from above, and so-called edgewise, in other words, bending in the width direction. Yes. Each of the primary coil 11 and the secondary coil 12 is formed such that the winding start portion and the winding end portion of the flat wire protrude outside the high-frequency transformer 100.

  The flat wires forming the primary coil 11 and the secondary coil 12 are all insulated from each other. For insulation of the rectangular wire, an insulating tape made of a resin film such as polyimide resin, polyimide amide resin, polyamide resin or polyurethane resin, or a woven or non-woven tape of aramid fiber such as Nomex (registered trademark) is wound around the rectangular wire. It may be performed by rotating, or by applying, drying and curing a varnish such as a polyimide resin, a polyimide amide resin, a polyamide resin, a polyurethane resin, or an epoxy resin.

  Further, the primary coil 11 and the secondary coil 12 are configured so that the rectangular wire constituting the secondary coil 12 is interposed in the gap of the rectangular wire constituting the primary coil 11, in other words, the rectangular coil constituting the primary coil 11. The wires and the rectangular wires constituting the secondary coil 12 are arranged alternately.

  Further, the primary coil 11 has more turns than the secondary coil 12. Therefore, the secondary coil 12 is inserted into the central portion of the primary coil 11, and there are portions where the secondary coil 12 is not inserted into both ends of the primary coil 11. Therefore, the high-frequency current output from the secondary coil 12 is a low voltage and large current than the high-frequency current input to the primary coil. Therefore, the rectangular wire constituting the secondary coil 12 has the same thickness as the rectangular wire constituting the primary coil 11, but is wide. Instead of using a rectangular wire having a width wider than that of the primary coil 11 in the secondary coil 12, a thick rectangular wire may be used.

  The primary coils 11 and the secondary coils 12 may be Y-connected or Δ-connected, respectively. The primary coils 11 may be Y-connected, the secondary coils 12 may be Δ-connected, or the primary coils 11 may be Δ-connected. Then, the secondary coils 12 may be Y-connected.

  The high-frequency transformer 100 can be created by the following procedure.

  In the case where the high frequency coil core 30 can be divided into the upper half 6 and the lower half 7, first, the primary coil 11 and the secondary coil 12 having an inner diameter substantially equal to the outer diameter of the columnar core 1. Are created in advance. Then, the primary coil 11 and the secondary coil 12 are combined in a predetermined form, and the upper columnar core 1A of the upper half 6 and the lower columnar core 1B of the lower half 7 are inserted. Finally, a fixing bolt is inserted into the bolt insertion hole 4 and the bolt insertion groove 8 of the top plate 2 and the bolt insertion hole 5 and the bolt insertion groove 9 of the bottom plate 3 so that the upper half 6 and the lower half 7 are integrated. We conclude to become.

  On the other hand, in the case where the columnar core 1 and the bottom plate 3 are integrally formed, the primary coil 11 and the secondary coil 12 are combined in a predetermined form, and each columnar core 1 is inserted. After each columnar core 1 is inserted into the primary coil 11 and the secondary coil 12, the top plate 2 is attached to the upper end of the columnar core 1, the bolt insertion hole 4 and the bolt insertion groove 8 of the top plate 2, and the bolt insertion of the bottom plate 3. A fixing bolt is inserted into the hole 5 and the bolt insertion groove 9 and fastened, and the top plate 2, the columnar core 1, and the bottom plate 3 are integrated.

  As shown in FIG. 27, the bottom plate 3 is placed on the substrate, and bolts are fixed to the bolt insertion holes 4 and the bolt insertion grooves 8 of the top plate 2 and the bolt insertion holes 5 and the bolt insertion grooves 9 of the bottom plate 3. And the tip of the fixing bolt may be screwed into a screw hole provided in the substrate and fastened.

  After the top plate 2, the columnar core 1 and the bottom plate 3 are integrated by fastening with fixing bolts, the primary coils 11 and the secondary coils 12 are connected to each other according to the use of the high-frequency transformer 100 and desired characteristics. Each is Y-shaped or Δ-connected.

DESCRIPTION OF SYMBOLS 1 Columnar core 1A Upper columnar core 1B Lower columnar core 1C Dividing surface 2 Top plate 3 Bottom plate 4 Bolt insertion hole 5 Bolt insertion hole 6 Upper half 7 Lower half 8 Bolt insertion groove 9 Bolt insertion groove 10 High frequency transformer core 11 Primary coil 12 Secondary coil 20 High-frequency transformer core 30 High-frequency transformer core 40 High-frequency transformer core 50 High-frequency transformer core 100 High-frequency transformer

Claims (7)

A columnar core formed of three ferrites arranged on the circumference at intervals of 120 degrees;
A top plate formed of ferrite connecting one end side of the three columnar cores;
A bottom plate formed of ferrite connecting the other end sides of the three columnar cores;
With
Each of the top plate and the bottom plate has an equilateral triangle or circular plane shape in which each side bulges outward in an arc shape,
Bolt insertion holes through which fixing bolts for fastening the three columnar cores, the top plate, and the bottom plate are inserted are formed in the center of the top plate and the bottom plate, and the bolt insertion grooves through which the fixing bolts are inserted include the top plate and A core for a high-frequency transformer that is formed at the midpoint of each side of the bottom plate, or that the bolt insertion hole is formed in the vicinity of the midpoint of each side at the center of the top plate and the bottom plate and the peripheral portion of the top plate and the bottom plate .   The top plate and the bottom plate are centered on the apexes of the equilateral triangle, and the plane shape of the triangle of the Roule, which is formed by connecting the arcs whose radius is one side of the equilateral triangle, or the sides of the triangle are outside of the Rouleaux triangle. The core for a high-frequency transformer according to claim 1, wherein the core for a high-frequency transformer has a regular triangular planar shape that is a bulging arc shape.   The core for a high-frequency transformer according to claim 1 or 2, wherein one or both of the first connecting member and the second connecting member and the columnar core are integrally formed.   Each of the columnar cores is divided into two on a plane orthogonal to the axis, and one of the two divided columnar cores and the first connecting member, and the other of the two divided columnar cores and the second connecting member are The high frequency transformer core according to claim 1 or 2, wherein the core is formed integrally. A high-frequency transformer core according to any one of claims 1 to 4,
A primary coil and a secondary coil wound around each of the columnar cores of the high-frequency transformer core;
High frequency transformer with The primary coil and the secondary coil are formed by bending a rectangular wire in its width direction and winding it around the columnar core,
The primary coil and the secondary coil are arranged such that a rectangular wire forming the other of the primary coil and the secondary coil is interposed in a gap of a rectangular wire forming one of the primary coil and the secondary coil. The high frequency transformer according to claim 5.   The high-frequency transformer according to claim 6, wherein the rectangular wire forming the primary coil and the rectangular wire forming the secondary coil are different from each other in at least one of width and thickness.

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