JP4287495B1 - Three-phase high frequency transformer - Google Patents

Abstract

The present invention prevents a drop in a secondary output voltage when a load current flows, and prevents heat from being generated between a primary winding and a secondary winding. Providing a high-frequency transformer suitable for power supply devices.
SOLUTION: A ferrite core 3, a primary coil 1 formed by bending a rectangular wire in its width direction and wound around the ferrite core 3 a plurality of times, and the same or different width as a rectangular wire forming the primary coil 1. And a secondary coil 2 formed by bending the flat wire having a width in the width direction and winding it around the ferrite core 3 one or more times, and forming one of the primary coil 1 and the secondary coil 2. A high-frequency transformer in which a rectangular wire constituting the other of the primary coil 1 and the secondary coil 2 is interposed in a gap between the wires.
[Selection] Figure 1

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 respectively joined by yokes (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 according to claim 1 is the same as a ferrite core, a primary coil formed by bending a rectangular wire in its width direction and wound around the ferrite core a plurality of times, and a rectangular wire forming the primary coil, or A secondary coil formed by bending a rectangular wire having a different width in the width direction and winding it around the ferrite core one or more times, and constitutes one of the primary coil and the secondary coil. The present invention relates to a high frequency transformer in which a flat wire constituting the other of the primary coil and the secondary coil is interposed in a gap of the flat wire.

  In the high frequency transformer, since flat rectangular wires are used for the primary coil and the secondary coil, unlike the case where round wires are used, the eddy current loss inside the primary coil and the secondary coil is small. It is effectively prevented that the transformer is ignited by heat generation.

  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.

  Furthermore, since the ferrite core is used as the core, even when a high frequency is input to the primary coil, the iron loss can be significantly reduced as compared with the case where an iron core laminated with a silicon steel plate is used as the core.

  The invention according to claim 2 relates to the high-frequency transformer according to claim 1, wherein the primary coil and the secondary coil have the same inner diameter and are arranged concentrically.

  In the high-frequency transformer, the coupling between the primary coil and the secondary coil is compared with the case where the inner diameters of the primary coil and the secondary coil are different from each other or when the primary coil and the secondary coil are not arranged concentrically. The degree is higher and magnetic flux leakage is smaller.

  According to a third aspect of the present invention, in the high-frequency transformer according to the first or second aspect, the rectangular wire constituting the primary coil and the rectangular wire constituting the secondary coil have at least one of width and thickness of each other. About different things.

  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 a fourth aspect of the present invention, in the high-frequency transformer according to any one of the first to third aspects, one of the primary coil and the secondary coil has more turns than the other, and a part of the one In which the other is interposed.

  In the high frequency transformer, by making the number of turns of the secondary coil larger than the number of turns of the primary coil, an alternating current having a higher voltage and a smaller current than the alternating current input to the primary coil is output from the secondary coil. Conversely, by making the number of turns of the primary coil larger than the number of turns of the secondary coil, an alternating current having a lower voltage and a larger current than the alternating current input to the primary coil is output from the secondary coil.

  According to a fifth aspect of the present invention, in the high-frequency transformer according to the fourth aspect, a plurality of the other are interposed in one of the primary coil and the secondary coil, and the other coil is connected in series or in parallel. Related to what is.

  In the high-frequency transformer, by connecting the other coil in series, an alternating current having a higher voltage than that of the other coil alone can be passed through the other coil. Further, by connecting the other coil in parallel, an alternating current having a larger current than that of the other coil alone can be passed through the other coil.

  A sixth aspect of the present invention relates to the high-frequency transformer according to any one of the first to fifth aspects, wherein the ferrite core is an outer iron core.

  In the high-frequency transformer, since the ferrite core is an outer iron core, if the width and thickness of the rectangular wire of the primary coil and the secondary coil and the number of turns of the primary coil and the secondary coil are the same, the ferrite Compared with a high-frequency transformer whose core is an inner iron side core, the ratio of the core to the coil is increased, and the properties as an iron machine are enhanced.

  A seventh aspect of the present invention relates to the high-frequency transformer according to any one of the first to fifth aspects, wherein the ferrite core is an inner iron type core.

  In the high-frequency transformer, since the ferrite core is an inner iron type core, if the width and thickness of the rectangular wire of the primary coil and the secondary coil, and the number of turns of the primary coil and the secondary coil are the same, the ferrite Compared with a high-frequency transformer whose core is a core on the outer iron side, the ratio of the core to the coil is reduced, and the properties as a copper machine become stronger.

  The invention according to claim 8 is the high-frequency transformer according to any one of claims 1 to 6, wherein the ferrite core and the set of the primary coil and the secondary coil are a three-phase alternating current U phase, V The present invention relates to a three-phase high-frequency transformer provided with three each corresponding to the phase and the W phase.

  The invention according to claim 8 relates to the high-frequency transformer according to any one of claims 1 to 6, wherein the high-frequency transformer is a single-phase high-frequency transformer in which single-phase alternating current is input to the primary coil.

  According to the first aspect of the invention, 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 of the primary winding to 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 power supply device having a capacity is provided.

  According to the invention of claim 2, since the degree of coupling between the primary coil and the secondary coil is higher and the magnetic flux leakage is further smaller, the high-frequency transformer is more suitable for a large-capacity power converter and a large-capacity power supply device. Is provided.

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

  According to the fourth aspect of the present invention, a high-frequency transformer in which a high-frequency current having a higher voltage than the high-frequency current input to the primary coil is output from the secondary coil, or a high-frequency having a lower voltage than the high-frequency current input to the primary coil. A high frequency transformer is provided in which current is output from a secondary coil.

  According to the fifth aspect of the present invention, there is provided a high-frequency transformer that can handle both cases where the high-frequency current input to the primary coil and the high-frequency current output from the secondary coil are high voltage and large current. The

  According to the sixth aspect of the present invention, the properties as an iron machine are strong, and therefore the number of turns of the primary coil and the secondary coil is small. In particular, a high-frequency current having a voltage lower than that of the high-frequency current input to the primary coil is secondary. A high-efficiency high-frequency transformer suitable for output from a coil is provided.

  According to the invention of claim 7, the property as a copper machine is strong, and therefore, the number of turns of the primary coil and the secondary coil can be increased, and in particular, the voltage is higher than the high-frequency current input to the primary coil. A high-efficiency high-frequency transformer suitable for outputting a high-frequency current from a secondary coil is provided.

  According to claim 8, a three-phase high-frequency transformer suitable as a large-capacity power conversion device and a large-capacity power supply device is provided.

  According to the ninth aspect, a single-phase high-frequency transformer suitable as a large-capacity power conversion device and a large-capacity power supply device is provided.

1. Embodiment 1

  An outer iron type high frequency transformer which is an example of the high frequency transformer of the present invention will be described below.

  As shown in FIGS. 1 to 4, the high-frequency transformer 10 according to the first embodiment includes an EE type ferrite core 3, and a primary coil 1 and a secondary coil 2 wound around the ferrite core 3.

  The ferrite core 3 is pressed by using a clamp or the like (not shown) from above and below by combining two E-shaped cores 3B formed by sintering ferrite into an E-shape so as to face each other. It is a match. Therefore, as shown in FIGS. 1 and 2, the ferrite core 3 is divided into a central core 3A and an outer core 3C located so as to surround the central core 3A from the outside.

  The central core 3A and the outer core 3C may be formed in a prismatic shape as shown in FIGS. 1 and 2, but the central core 3A is formed in a cylindrical shape as shown in FIGS. If the inner surface of the outer core 3C is formed in a cylindrical surface that is recessed outward, there is no useless gap between the ferrite core 3 and the primary coil 1 and secondary coil 2, and the area of the winding window is reduced. Since the space factor occupied by the total area of the cross-sectional areas of the primary coil and the secondary coil approaches 100%, it contributes to further miniaturization of the high-frequency transformer.

  Each of the primary coil 1 and the secondary coil 2 is formed by winding a rectangular wire in a clockwise direction when viewed from above on the central core 3A and so-called edgewise, in other words, bending in the width direction. Yes. Each of the primary coil 1 and the secondary coil 2 is formed so that the winding start portion and the winding end portion of the flat wire protrude outside the high-frequency transformer 10, and are formed as lead wires 1A and 2A. .

  Further, the primary coil 1 and the secondary coil 2 are configured so that the rectangular wire constituting the secondary coil 2 is interposed in the gap between the rectangular wires constituting the primary coil 1, in other words, the rectangular coil constituting the primary coil 1. The wires and the rectangular wires constituting the secondary coil 2 are alternately arranged.

  Further, since the primary coil 1 has more turns than the secondary coil 2, the secondary coil 2 is inserted into the center of the primary coil 1, and the secondary coil 2 is inserted into both ends of the primary coil 1. There is no part. Therefore, since the high-frequency current output from the secondary coil 2 is lower in voltage and larger than the high-frequency current input to the primary coil, the rectangular wire that forms the secondary coil 2 is the rectangular that forms the primary coil 1. The line and thickness are the same but wide. Instead of using a rectangular wire having a width wider than that of the primary coil 1 in the secondary coil 2, a thick rectangular wire may be used. However, it is preferable that the primary coil 1 and the secondary coil 2 have the same inner diameter in order to increase the degree of coupling between the primary coil 1 and the secondary coil 2.

  The surfaces of the rectangular wires forming the primary coil 1 and the secondary coil 2 are all insulated with a resin such as a polyimide resin, a polyamideimide resin, a polyamide resin, or a polyurethane resin. In order to reinforce the insulation of the rectangular wire, insulating tape made of a resin film such as polyimide resin, polyamideimide resin, polyamide resin, polyurethane resin, aramid fiber woven fabric or non-woven fabric tape such as Nomex (registered trademark) You may wind from the top insulated with the said resin. The ratio w / t between the width w and the thickness t of the flat wire is usually in the range of 2 to 10, preferably in the range of 3 to 5.

  The high-frequency transformer 10 can be created by the following procedure. First, a rectangular wire is wound so as to have an inner diameter into which the central core 3A can be inserted to create a primary coil 1 and a secondary coil 2, and the primary coil 1 and the secondary coil 2 are combined in a predetermined form.

  Then, the ferrite core 3 is formed by inserting the E-shaped core 3B from both ends of the primary coil 1 and the secondary coil 2 combined in a predetermined form.

  In the high-frequency transformer 10, the two lead wires 1A of the primary coil 1 are connected to the input side, and the lead wire 2A of the secondary coil 2 is connected to the output side. When a high-frequency current of a predetermined voltage and current is applied to the lead wire 1A of the primary coil 1, a high-frequency current of voltage and current corresponding to the turns ratio between the primary coil 1 and the secondary coil 2 is secondary by electromagnetic induction. It is output to the lead wire 2A of the coil 2.

  As described above, the configuration in which the number of turns of the primary coil 1 is larger than the number of turns of the secondary coil 2 has been described. Can be made larger than the number of turns of the primary coil 1. In this case, the high-frequency current output from the secondary coil 2 is lower in current and voltage than the high-frequency current input to the primary coil 1.

2. Embodiment 2

  An inner iron type high frequency transformer which is another example of the high frequency transformer of the present invention will be described below.

  As shown in FIGS. 5 and 6, the high-frequency transformer 20 according to the second embodiment includes a ferrite core 4 having two mutually parallel cylindrical coil insertion portions 4 </ b> A and one coil insertion portion 4 </ b> A of the ferrite core 4. And the primary coil 11 and the secondary coil 21 wound around, and the primary coil 12 and the secondary coil 22 wound around the other coil insertion portion 4A of the ferrite core 4.

  The primary coil 11 and the secondary coil 21, and the primary coil 12 and the secondary coil 22 are all formed by winding a rectangular wire in the clockwise direction when viewed from above and edgewise.

  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. However, it is preferable that the primary coil 11 and the secondary coil 21 have the same inner diameter in order to increase the degree of coupling between the primary coil 11 and the secondary coil 21.

  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. However, it is preferable that the primary coil 12 and the secondary coil 22 have the same inner diameter in order to increase the degree of coupling between the primary coil 12 and the secondary coil 22.

  The winding start portion of the primary coil 11 is led out to the outside of the high-frequency transformer 20 to be a lead wire 11A. Then, the winding end portion of the primary coil 11 is also drawn to the outside of the high-frequency transformer 20 to be a lead wire 11B.

  On the other hand, the winding start portion of the primary coil 12 is also drawn to the outside of the high-frequency transformer 20 to be a lead wire 12A. A portion at the end of winding of the primary coil 12 is also drawn to the outside of the high-frequency transformer 20 to be a lead wire 12B.

  The primary coil 11 and the primary coil 12 are electrically connected at the lead wires 11B and 12A.

  In addition, in the primary coil 11 and the primary coil 12, the lead wire 11B on the winding end side of the primary coil 11 is replaced with an external connection for leading the lead wires 11B and 12A to the outside of the high-frequency transformer 20 and electrically connecting them. Without cutting, the primary coil 12 is continuously stretched over the lead wire 12A on the winding start side of the primary coil 12 so as to draw a figure 8, and the rectangular wire is pulled down in the direction opposite to the primary coil 11 to form the primary coil 12. It is good also as an integral coil without a connection part. Such a winding method of the primary coils 11 and 12 is referred to as folded continuous winding. In this case, the secondary coils 21 and 22 are preferably externally connected.

  The winding start portion of the secondary coil 21 is drawn to the outside of the high-frequency transformer 20 to be a lead wire 21A. Then, the lead wire 21B at the winding end portion of the secondary coil 21 is not drawn out to the outside of the high-frequency transformer 20 and is not cut, and is directly led to the lead wire 22A on the winding start side of the secondary coil 22. The secondary coil 21 is wound up as it is in the direction opposite to that of the secondary coil 21 to form a secondary coil 22, and the secondary coils 21 and 22 are integrated. Such a winding method of the secondary coils 21 and 22 is referred to as continuous folding.

  The winding end portion of the secondary coil 22 is drawn to the outside of the high-frequency transformer 20 to be a lead wire 22B.

  Instead of integrating the secondary coils 21 and 22 by continuous winding, the lead wire 21B on the winding end side of the secondary coil 21 is cut and the lead wire 22A on the winding start side of the secondary coil 22 is combined with a high-frequency transformer. It is good also as an external connection which pulls out to the outer side of 20 and electrically connects leader line 21B and leader line 22A. In this case, the primary coil 11 and the primary coil 12 are preferably folded continuously.

  The rectangular wires forming the primary coils 11 and 12 and the secondary coils 21 and 22 are as described in the first embodiment.

  In the high frequency transformer 20, the lead wire 11A of the primary coil 11 and the lead wire 12B of the primary coil 12 are connected to the input side, and the lead wire 21A of the secondary coil 21 and the lead wire 22B of the secondary coil 22 are connected to the output side. Is done. Then, when a high frequency current of a predetermined voltage and current is applied to the lead wires 11A and 12B, according to the ratio between the total number of turns of the primary coils 11 and 12 and the total number of turns of the secondary coils 21 and 22 by electromagnetic induction. The high frequency current of the voltage and current is output to the lead lines 21A and 22B.

3. Embodiment 3

  A three-phase high-frequency transformer, which is still another example of the high-frequency transformer of the present invention, will be described below.

  As shown in FIGS. 7 and 8, the three-phase high-frequency transformer 30 according to the third embodiment has primary coils 11, 12, 13 and secondary coils 21, 22, 23 wound around a three-phase tripod ferrite core 5. It is a thing.

  The tripod ferrite core 5 is included in the ferrite core in the high-frequency transformer of the present invention, and as shown in FIGS. 7 and 8, a columnar core 5A formed of three ferrites arranged on the circumference at intervals of 120 degrees, A plate-like top plate 5B formed of ferrite connecting the upper ends of the three columnar cores 5A and a bottom plate 5C formed of ferrite connecting the lower ends of the three columnar cores 5A are provided.

  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 for inserting a fixing bolt (not shown) is provided in the central portion, and a bolt insertion groove 7 for similarly inserting the fixing bolt is provided in the central portion of each side. ing.

  In the tripod ferrite core 5, the columnar core 5 </ b> A can be vertically divided into two along a plane orthogonal to the axis thereof, and the upper half can be integrated with the top plate 5 </ b> B and the lower half can be 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.

  One of the three columnar cores 5A has the primary coil 11 and the secondary coil 21, the other one has the primary coil 12 and the secondary coil 22, and the other one has the primary coil. 13 and the secondary coil 23 are wound.

  The configurations of the primary coil 11 and the secondary coil 21 and the configurations of the primary coil 12 and the secondary coil 22 are as described in the second embodiment. The configurations of the primary coil 13 and the secondary coil 23 are the same as the configurations of the primary coil 11 and the secondary coil 21, and the primary coil 12 and the secondary coil 22.

  As shown in FIG. 7, the winding start portion and winding end portion of the primary coil 11 are led out to the outside of the high-frequency transformer 30 to become lead wires 11A and 11B, respectively. Further, the winding start portion and the winding end portion of the secondary coil 21 are also drawn out to the outside of the high-frequency transformer 30, respectively, as lead wires 21A and 21B.

  Similarly, also in the primary coil 12 and the secondary coil 22, the winding start portion and the winding end portion are drawn out to the outside of the high-frequency transformer 30 to be lead wires 12 A, 12 B, 22 A, 22 B, respectively. Also in the secondary coil 23, the winding start portion and the winding end portion are drawn to the outside of the high-frequency transformer 30, respectively, to become lead wires 13A, 13B, 23A, and 23B.

  In the primary coils 11, 12, and 13, the lead wire 11 </ b> B on the winding end side of the primary coil 11 and the lead wire 12 </ b> A on the winding start side of the primary coil 12 are connected wires 14 </ b> A, and the lead wire on the winding end side of the primary coil 12. 12B and the lead wire 13A on the winding start side of the primary coil 13 are connected to the connection wire 14B, and the lead wire 13B on the winding end side of the primary coil 13 and the lead wire 11A on the winding start side of the primary coil 11 are electrically connected to the connection wire 14C. Connected. The connection line 14A is connected to the U phase on the input side, the connection line 14B is connected to the V phase on the input side, and the connection line 14C is connected to the W phase on the input side.

  Similarly, in the secondary coils 21, 22, and 23, the lead wire 21 </ b> B on the winding end side of the secondary coil 21 and the lead wire 22 </ b> A on the winding start side of the secondary coil 22 are connected wires 15 </ b> A, and the secondary coil 22. The lead wire 22B on the winding end side and the lead wire 23A on the winding start side of the secondary coil 23 are the connecting wire 15B, and the lead wire 23B on the winding end side of the secondary coil 23 and the winding start side of the secondary coil 21 are connected. The lead wire 21A is electrically connected by a connection line 15C. The connection line 15A is connected to the U phase on the output side, the connection line 15B is connected to the V phase on the output side, and the connection line 15C is connected to the W phase on the output side.

  In the primary coils 11, 12, and 13, the lead wire 11B and the lead wire 12A are connected by the connecting wire 14A, the lead wire 12B and the lead wire 13A are connected by the connecting wire 14B, and the lead wire 13B and the lead wire 11A are connected. Instead of connecting with the line 14C, the leader line 11B and the leader line 12A, the leader line 12B and the leader line 13A, and the leader line 13B and the leader line 11A may be directly connected. In this case, the U-phase on the input side is connected to the connecting portion between the lead wire 11B and the lead wire 12A, the V-phase on the input side is connected to the connecting portion between the lead wire 12B and the lead wire 13A, and the lead wire 13B and the lead wire 11A are connected. What is necessary is just to connect the W phase of an input side to a connection part.

  Further, instead of drawing out the lead wires 11A, 11B, 12A, 12B, 13A, and 13B to the outside of the three-phase transformer 30 and externally connecting them, the lead wires 11A, 11B, 12A, 12B, 13A, and 13B may be wound continuously. Specifically, the lead wire 11B is continuously passed over the lead wire 12A on the winding start side of the primary coil 12 by a single rectangular wire, and is wound as it is on the columnar core 5A adjacent to the primary coil 11 to form the primary coil 12. The lead wire 12B is continuously passed over the lead wire 13A on the winding start side of the primary coil 13 as a single flat wire, and is wound as it is on the columnar core 5A adjacent to the primary coil 12 to form the primary coil 13, and the lead wire 13B. Can be connected to the lead wire 11A on the winding start side of the primary coil 11 with a single rectangular wire. In this case, the U-phase, V-phase, and W-phase on the input side are respectively the folded portion between the leader line 11B and the leader line 12A, the folded portion between the leader line 12B and the leader line 13A, and the leader line 13B. What is necessary is just to connect to the connection part between leader line 11A.

  Similarly, in the secondary coils 21, 22, and 23, the lead wire 21B and the lead wire 22A are connected by the connecting wire 15A, the lead wire 22B and the lead wire 23A are connected by the connecting wire 15B, and the lead wire 23B and the lead wire 21A are connected. May be directly connected to the leader line 21B and the leader line 22A, the leader line 22B and the leader line 23A, and the leader line 23B and the leader line 21A. In this case, the U phase on the output side is connected to the connecting portion between the lead wire 21B and the lead wire 22A, the V phase on the output side is connected to the connecting portion between the lead wire 22B and the lead wire 23A, and the lead wire 23B and the lead wire 21A are connected. What is necessary is just to connect the W phase of an output side to a connection part.

  Further, instead of drawing out the lead wires 21A, 21B, 22A, 22B, 23A, and 23B to the outside of the three-phase transformer 30 and externally connecting them, the lead wires 21A, 21B, 22A, 22B, 23A, and 23B may be wound continuously. Specifically, the lead wire 21B is continuously crossed over the lead wire 22A on the winding start side of the secondary coil 22 as it is with a single rectangular wire, and is wound up around the columnar core 5A adjacent to the secondary coil 21 as it is. The lead wire 22B is continuously passed over the lead wire 23A on the winding start side of the secondary coil 23 with a single rectangular wire as it is, and is wound up on the columnar core 5A adjacent to the secondary coil 22 as it is. 23, the lead wire 23B can be connected to the lead wire 21A on the winding start side of the secondary coil 21 with a single rectangular wire. In this case, the U-phase, V-phase, and W-phase on the output side are respectively the folded portion between the leader line 21B and the leader line 22A, the folded portion between the leader line 22B and the leader line 23A, and the leader line 23B. What is necessary is just to connect to the connection part between 21 A of leader lines.

  In the high-frequency transformer 30, when a three-phase high-frequency current of a predetermined voltage and current is applied to the connection lines 14A, 14B, and 14C, the U-phase, V-phase, and W-phase are changed into the primary coil 11 and the secondary coil 21 by electromagnetic induction. Three-phase high-frequency currents, which are voltages and currents corresponding to the turns ratio of the primary coil 12 and the secondary coil 22, and the primary coil 13 and the secondary coil 23, are output to the connection lines 15A, 15B, and 15C.

4). Embodiment 4

  An example in which two secondary coils are arranged in one primary coil in the high-frequency transformer of the present invention will be described below.

  As shown in FIG. 9, the high-frequency transformer 40 according to the fourth embodiment includes an EE type ferrite core 3, and a primary coil 1 and secondary coils 24 and 25 wound around the ferrite core 3.

  As with the high frequency transformer according to the first embodiment, the ferrite core 3 is a combination of two E-shaped cores 3B formed by sintering ferrite into an E-shape so as to face each other and tightening metal fittings from above and below. It is pressed and matched using. Therefore, as shown in FIGS. 1 and 2, the ferrite core 3 is divided into a central core 3A and an outer core 3C located so as to surround the central core 3A from the outside.

  Each of the primary coil 1 and the secondary coils 24 and 25 is formed by winding a rectangular wire in a clockwise direction when viewed from above on the central core 3A and so-called edgewise, in other words, bending in the width direction. Has been.

  The primary coil 1 is formed so that a winding start portion and a winding end portion of a flat wire protrude outside the high-frequency transformer 40, and are formed as lead wires 1A and 1B.

  Similarly, the secondary coils 24 and 25 are formed so that the winding start portion and the winding end portion of the flat wire protrude to the outside of the high-frequency transformer 40, and lead wires 24A, 24B, 25A, and 25B are formed. .

  Further, the primary coil 1 and the secondary coils 24 and 25 are arranged so that the rectangular wires constituting the secondary coils 24 and 25 are interposed in the gaps of the rectangular wires constituting the primary coil 1, in other words, the primary coil 1. And the rectangular wires constituting the secondary coils 24 and 25 are alternately arranged.

  In the secondary coil 24 and the secondary coil 25, as shown in FIG. 9 and FIG. 10, a lead wire 24B on the winding end side of the secondary coil 24 and a lead wire 25A on the winding start side of the secondary coil 25 are provided. They are connected in series by being electrically connected by the connecting line 26.

  The primary coil 1 has more turns than the secondary coils 24 and 25. Therefore, since the high-frequency current output from the secondary coils 24 and 25 is a high voltage current lower than the high-frequency current input to the primary coil 1, the rectangular wire constituting the secondary coils 24 and 25 is the primary coil. The rectangular wire constituting 1 has the same thickness but is wide. In the secondary coils 24 and 25, a rectangular wire having a larger thickness may be used instead of a rectangular wire having a width wider than that of the primary coil 1. However, it is preferable to increase the degree of coupling between the primary coil 1 and the secondary coils 24 and 25 so that the primary coil 1 and the secondary coils 24 and 25 have the same inner diameter.

  The rectangular wires constituting the primary coil 1 and the secondary coils 24 and 25 are as described in the first embodiment.

  Hereinafter, the operation of the high-frequency transformer 40 will be described. When the lead wires 1A and 1B of the primary coil 1 are connected to the input side and a high frequency current of a predetermined voltage and current is applied, a voltage and current high frequency current corresponding to the number of turns flows in the secondary coils 24 and 25. . Here, since the secondary coil 24 and the secondary coil 25 are connected in series by the connection line 26, the lead wire 24A on the winding start side of the secondary coil 24 and the lead wire on the winding end side of the secondary coil 25 are connected. A high-frequency current having a voltage equal to the sum of the voltage in the secondary coil 24 and the voltage in the secondary coil 25 is output between 25B and 25B.

5). Embodiment 5

  Another example in which two secondary coils are arranged in one primary coil in the high-frequency transformer of the present invention will be described below.

  As shown in FIGS. 11 and 12, the high-frequency transformer 50 according to the fifth embodiment includes two secondary coils 24 and 25 interposed in the primary coil 1, and the secondary coil 24 is pulled out on the winding start side. The wire 24A and the lead wire 25A on the winding start side of the secondary coil 25, and the lead wire 24B on the winding end side of the secondary coil 24 and the lead wire 25B on the winding end side of the secondary coil 25 are connected to the connecting wires 27 and 28, respectively. Are electrically connected. Therefore, the secondary coil 24 and the secondary coil 25 are connected in parallel. The secondary coils 24 and 25 have the same number of turns of flat wires.

  Therefore, when a high frequency current having a predetermined voltage and current is applied to the primary coil 1, a high frequency current having a current equal to the sum of the current flowing through the secondary coil 24 and the current flowing through the secondary coil 25 is present on the secondary coil side. Flowing. Therefore, a high voltage current with a low voltage and a large current can be output.

  The high frequency transformer 50 has the same configuration and function as the high frequency transformer according to the fourth embodiment except for the above points.

  The high-frequency transformer according to the present invention includes not only switching power supply devices and power conversion devices of various types such as single forward method, flyback method, push-pull method, half-bridge method, full-bridge method, mag-amp method, and chopper method, but also organic It is also suitably used for EL displays and plasma displays. Also,

FIG. 1 is a side view showing the configuration of the high-frequency transformer according to the first embodiment. FIG. 2 is a plan view showing the configuration of the high-frequency transformer according to the first embodiment. FIG. 3 is a side view illustrating the configuration of another example of the high-frequency transformer according to the first embodiment. FIG. 4 is a plan view illustrating the configuration of another example of the high-frequency transformer according to the first embodiment. FIG. 5 is a side view showing the configuration of the high-frequency transformer according to the second embodiment. FIG. 6 is a plan view showing the configuration of the high-frequency transformer according to the second embodiment. FIG. 7 is a side view showing the configuration of the high-frequency transformer according to the third embodiment. FIG. 8 is a plan view showing the configuration of the high-frequency transformer according to the third embodiment. FIG. 9 is a side view showing the configuration of the high-frequency transformer according to the fourth embodiment. FIG. 10 is a block diagram illustrating a configuration of a high-frequency transformer according to the fourth embodiment. FIG. 11 is a side view showing the configuration of the high-frequency transformer according to the fifth embodiment. FIG. 12 is a block diagram illustrating a configuration of a high-frequency transformer according to the fifth embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Primary coil 1A Lead wire 2A Lead wire 2 Secondary coil 3 Ferrite core 3A Center core 3B E-shaped core 3C Outer core 4 Ferrite core 4A Coil insertion part 5 Tripod ferrite core 5A Columnar core 5B Top plate 5C Bottom plate 6 Bolt insertion hole 7 Bolt insertion groove 10 High-frequency transformer 11 Primary coil 12 Primary coil 13 Primary coil 11A Lead wire 11B Lead wire 12A Lead wire 12B Lead wire 13A Lead wire 13B Lead wire 14A Connection wire 14B Connection wire 14C Connection wire 15A Connection wire 15B Connection wire 15C Connecting wire 20 High-frequency transformer 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 24 Secondary coil 24A Lead wire 24B Lead wire 25 Secondary coil 25A Leader line 25B Leader line 26 Connection line 27 Continued line 28 connecting line 30 three-phase high frequency transformer 40 high-frequency transformer 50 high-frequency transformer

Claims (1)

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, One end of one of the secondary coils on the top plate side is connected to the other end of the other secondary coil on the bottom plate side, and one other end of the other secondary coil on the top plate side is connected to another one. Three-phase connecting the other end on the bottom plate side of one of the secondary coils, and connecting one end on the top plate side of the other secondary coil and the other end on the bottom plate side of any one of the secondary coils High frequency transformer.

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