JP2012216694A - High frequency transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To markedly improve the skin effect, leakage inductance, electromagnetic coupling, noise, size, cost, etc. in a high frequency transformer for high frequency induction heating and the like.SOLUTION: A high frequency transformer is formed as follows: an input and output coil 2 is configured by forming a secondary winding 4 comprising a wide secondary current area over both inner side and outer side of a primary winding 3 by arranging a conductive plate part enclosing circular inner periphery with edge 5 and a conductive plate part enclosing circular outer periphery with edge 6 such that positions of circular ends 7, 8 are in common in the vicinity of the inner periphery and outer periphery of the primary winding 3 wound in a cylindrical shape, and by connecting side edges of both conductive plate parts 5, 6 with each other with conductive bridge plates 9, 10; the input and output coil is fixed to a core 1 in a single layer or multiple layers; and the primary winding 3 is formed of a conductive pipe in which refrigeration fluid can be flowed or a straight angle conductive wire.

Description

  The present invention relates to a high frequency transformer for high frequency induction heating or the like.

  Since the conventional induction heating transformer has a low operating frequency, there is no problem with the skin effect, leakage inductance, noise, and the like. However, in recent years, with the increase in frequency and capacity of the inverter arranged on the input side, these problems cannot be ignored.

  In general, in a conventional high-frequency transformer for high-frequency induction heating, the output side has a low voltage and a large current, so the secondary winding on the output side is formed with one turn of the copper plate in consideration of reduction of the skin effect. That is, as shown in FIG. 19 to FIG. 21, for example, the secondary winding b of one turn of the copper plate is fitted to the outer periphery of the primary winding a obtained by winding a copper tube in a cylindrical shape through insulating paper, A synthetic resin is integrally molded with an electrically insulating synthetic resin and formed into an input / output coil c, and the input / output coil is incorporated in a core d to constitute a transformer. Therefore, both the primary winding a and the secondary winding b of the input / output coil are cooled by the outside air through the mold resin e. In particular, in the case of FIGS. 19 to 21, the primary winding a is flowed through the primary winding a by flowing cooling water. When the winding a is cooled, the secondary winding b is also cooled through the mold resin e. In the figure, f and f are a pair of output terminals provided at a pair of folded ends of the secondary winding b.

  However, since the secondary winding b exists only in one turn of the copper plate outside the primary winding a, the leakage inductance of the winding and the electromagnetic coupling between the windings deteriorate, resulting in high leakage and low coupling. Is inefficient.

  By the way, according to the patent document, in an air-forced fluid forced cooling transformer, a secondary winding of one turn of a copper plate is arranged outside a primary winding obtained by winding a copper tube into a cylindrical shape, and this secondary A cooling water channel is provided outside the windings, and the cooling water flows in the primary winding and the cooling water channel of the secondary winding, respectively, thereby cooling the primary winding and the secondary winding individually. A large number of missing ring metal strips project inward from the inner peripheral surface of the next winding, and these missing ring metal strips are inserted between the turns of the primary winding so that the electromagnetic It is shown that the coupling is enhanced (Patent Document 1).

  However, in this case, not only is the structure considerably complicated, but the overall configuration becomes large, and so much improvement in leakage inductance and electromagnetic coupling in the winding cannot be expected. On the other hand, the difficulty of production increases, the labor and time required increase, the cost increases, and noise may be generated. Further, since the coil is an air-core coil, the magnetic resistance of the magnetic path is large, the magnetic flux density is lowered, the efficiency is deteriorated, and the capacity cannot be increased.

  In addition, as an air core low leakage magnetic flux type high frequency induction heating transformer, a hollow conductor that flows cooling water inside, that is, a conductive pipe is wound into a cylindrical shape, and this is further bent into an annular shape to form a toroidal type. A primary winding is formed, and a conductive annular container body having an endless annular cross-section and an endless annular donut shape along the primary winding is insulated outside the primary winding. The thing which made this the secondary winding by making it adhere through a thing is shown (patent document 2).

  However, in this case as well, since the winding is an air-core coil having no core, the magnetic resistance of the magnetic path is large, the magnetic flux density is lowered and the efficiency is deteriorated, so that the capacity cannot be increased. Of course, it is possible to use a cored coil (see Patent Document 3 and Patent Document 4). However, since this core is a ring core belonging to the toroidal type, the core also forms a secondary winding. Since the primary winding must be enclosed in the container body, how to limit the heat generation and heat storage of the core itself is a big problem. In a simple water-cooling structure in which cooling water flows only inside the primary winding by the conductive pipe, The temperature rise cannot be suppressed. In addition, as the capacity increases, the structure becomes more complicated and larger, and the cost increases.

Japanese Patent Publication No. 48-17806 Japanese Examined Patent Publication No. 62-62425 JP-A-8-148346 JP 2008-21097247 A

  The present invention is to improve the skin effect, leakage inductance, electromagnetic coupling, noise, etc., and to solve the above-mentioned conventional problems.

  In order to achieve the above object, a high-frequency transformer according to claim 1 of the present invention is provided with an end ring-shaped inner peripheral surrounding conductive plate portion in the vicinity of an inner periphery and an outer periphery of a primary winding wound in a cylindrical shape. Ended annular outer periphery surrounding conductive plate portion is arranged with the position of the ring end portion in common, and the side edges of both conductive plate portions are connected to each other by the conductive bridge plate portion, A secondary winding having a wide secondary current region extending to both the outside and the outside is formed to form an input / output coil, and the input / output coil is fitted to the core in a single or multiple layers. It is what.

  As a result, the secondary winding is formed by the end annular inner periphery surrounding conductive plate portion facing the inside and outside of the primary winding, the end annular outer periphery surrounding conductive plate portion, and the conductive bridge plate portion connecting these, and the primary winding The winding is not only sandwiched between the inner and outer ends of the secondary annular winding with the end ring inner peripheral conductive plate portion and the end ring outer peripheral conductive plate portion at a close distance from each other, but also the conductive bridge plate. In combination with this part, the secondary winding is generally encased in the secondary winding. Therefore, leakage of magnetic flux from the primary winding to the outside is completely prevented, and most of the magnetic flux generated in the primary winding is prevented. All of them are linked to the secondary winding, so that the leakage inductance and the magnetic coupling between the windings can be remarkably improved. In addition, the secondary winding has a current region that is doubled by both the end-annular inner peripheral conductive plate portion and the end-annular outer peripheral conductive plate portion due to the presence of the conductive bridge plate portion. It can be secured with a wide area and can sufficiently cope with a large output. Of course, the primary winding can be made of a conductive pipe or a flat conductor capable of circulating a cooling fluid, and the superiority to the skin effect can be secured. Thus, it is possible to increase the capacity, compactly and concisely combine them in a state suitable for high output, and reduce or eliminate noise. Furthermore, the input / output coil is fitted to the core in a single layer or multiple layers, and does not enclose the core inside, so there is no need to forcibly cool the core itself from the outside, and the size is reduced. It is possible to simplify the structure, simplify and facilitate the production, and reduce the cost.

  In addition to the configuration described in claim 1, the high-frequency transformer described in claim 2 is formed of a conductive pipe capable of circulating a cooling fluid in the primary winding, and heat is generated in a gap inside the secondary winding. It is configured to fill the conductive electrically insulating material and cool the secondary winding together with the cooling fluid flowing in the conductive pipe.

  Thus, by flowing a cooling fluid through the primary winding formed of the conductive pipe, in combination with the configuration of claim 1, the secondary winding as well as the primary winding passes through the heat conductive electrically insulating material. Can be cooled, and miniaturization, simplification, etc. can be promoted.

  Furthermore, the high-frequency transformer according to claim 3 is formed by forming the primary winding with a rectangular wire in addition to the structure according to claim 1.

  As a result, the density of the primary winding can be increased while ensuring the superiority of the primary winding with respect to the skin effect, and miniaturization, simplification, etc. can be promoted.

  Next, in addition to the configuration described in claim 1, claim 2 or claim 3, the high-frequency transformer described in claim 4 superimposes the input / output coils in a plurality of layers, and adjacent to each other located between layers. The end-annular inner peripheral surrounding conductive plate portion and the end-annular outer peripheral surrounding conductive plate portion are a single end-annular inner / outer peripheral conductive plate portion, and the conductive bridge plate portion is also a series.

  Thereby, structure and manufacture can be simplified, and size reduction and cost reduction can be achieved.

  According to the present invention, the secondary winding can generally wrap only the primary winding at a close distance, and the magnetic flux leakage from the primary winding can be accurately prevented, and the leakage inductance and the magnetic Coupling can be greatly improved, the leakage inductance can be reduced to easily adjust for load fluctuations, the output current range of the secondary winding can be greatly increased, and the secondary winding It is possible to reliably retain the superiority to the skin effect, and to ensure that the primary winding is superior to the skin effect by forming it with a conductive pipe or a rectangular conductor capable of circulating cooling fluid. The entire transformer can be reasonably increased in capacity, can be compactly and simply combined in a state suitable for high output, and the core itself must be forcedly cooled from the outside. There is no reduction in size, simplification of structure, simplification of manufacture, ease of operation, and cost reduction, and the heat conduction is achieved by filling the gap inside the secondary winding with a heat conductive electrically insulating material. The secondary winding can be cooled reasonably and efficiently together with the primary winding through the conductive insulating material, and a cooling means dedicated to the secondary winding can be provided to supply cooling water into the secondary winding. It is possible to eliminate the provision of a through hole or a complicated cooling water channel, and the cost can be reduced. In addition, it is possible to further increase the cooling efficiency by making the heat conductive electrically insulating material present in the secondary winding and further solidifying the input / output coil or the entire transformer with the electrically insulating mold resin having good heat conductivity. Noise can be reduced to almost no or none. In addition, by forming the primary winding with a rectangular wire, it is possible to increase the winding density while ensuring superiority with respect to the skin effect in the primary winding, and it is possible to promote downsizing, simplification, etc. . In addition, when the input / output coil is superposed in a plurality of layers, the adjacent end annular inner peripheral conductive plate portions and end end annular outer peripheral conductive plate portions located between the layers are combined into a single end annular inner peripheral periphery. The surrounding conductive plate portion can be formed, and the conductive bridge plate portion can be made into a series, and the structure and manufacturing can be further simplified, downsized, and cost can be reduced. Therefore, the intended purpose can be achieved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing a first embodiment of a high-frequency transformer according to the present invention. It is a cutting front view of the first embodiment. It is a perspective view of the principal part of the Example 1. FIG. It is a cutting top view which shows Example 2 of the high frequency transformer which concerns on this invention. It is a cutting front view of the same Example 2. It is a perspective view of the principal part of the Example 2. It is an external appearance top view of the Example 2. FIG. It is an external appearance front view of Example 2. It is an external appearance side view of the Example 2. FIG. It is a synthetic resin mold external appearance top view of the Example 2. It is a synthetic resin mold external appearance front view of the Example 2. It is a synthetic resin mold external appearance side view of the Example 2. It is a cutting top view which shows Example 3 of the high frequency transformer which concerns on this invention. It is a cutting front view of the same Example 3. It is a perspective view of the principal part of the Example 3. It is an external appearance top view of the Example 3. It is an external appearance front view of the Example 3. It is an external appearance side view of the Example 3. It is a cutting top view of a prior art example. It is a cutting front view of the same example. It is a perspective view of the principal part of the example.

[Example 1]
FIGS. 1 to 3 show embodiments of a high-frequency transformer corresponding to claims 1 and 2 according to the present invention in which a single input / output coil is used and a forced cooling system using a cooling fluid is used.

  In the high-frequency transformer shown in FIGS. 1 to 3, a single input / output coil 2 is fitted to an outer iron type core 1 in which a plurality of ferrite cores are combined via an electrical insulating paper 18, and the input / output coil 2 is sandwiched between the inner circumference and the outer circumference of the primary winding 3 wound in a cylindrical shape, with the end ring inner circumference surrounding conductive plate portion 5 and the end ring outer circumference surrounding conductive plate portion 6 in a short distance. In addition, the ring end portions 7 and 8 are arranged at the same position, and the side edge portions of both conductive plate portions are connected to each other by the conductive bridge plate portions 9 and 10 so that the inner side and the outer side of the primary winding 3 are connected to each other. Are formed in the secondary winding 4 of one turn having a wide secondary current region, and the connection end portions 11 and 12 are protruded outward from both ends of the end annular outer peripheral surrounding conductive plate portion 6. The output terminals 13 and 14 are attached to these connection ends. In assembling the primary winding 3 and the secondary winding 4, the secondary winding 4 is divided at an appropriate position to thereby form two or more members or the above-described plate portions 5, 6, 9, It is preferable that each of the ten divided bodies is combined with the primary winding 3 and then the members are electrically and mechanically joined and integrated by soldering or the like. The lead-out end portions 15 and 16 of the primary winding 3 are provided with a window hole 17 in the conductive bridge plate portions 9 and 10 and are drawn out through the window hole. 1 to 3, the input / output coil 2 is formed in a rectangular tube shape, but may be formed in a cylindrical shape or the like. This applies not only to the first embodiment but also to other embodiments.

  The primary winding 3 is formed by winding a conductive pipe such as a copper tube into a cylindrical shape, and an electric insulating paper 19 is interposed between the secondary winding 4 and the window hole 17. A part of the gap is filled with an electrical insulating material 20 having good thermal conductivity such as silicon resin, urethane resin, epoxy resin or the like, and is closely integrated. The primary winding 3 formed of a conductive pipe can ensure superiority to the skin effect.

  The input / output coil 2 thus formed is integrally air-cooled, but by flowing a cooling fluid in the primary winding 3, not only the primary winding 3 but also the secondary winding 4 is electrically insulated. It is forcedly cooled together through the paper 19 and the electrical insulating material 20. The cooling fluid may be a direct cooling fluid such as cooling water or an indirect cooling fluid such as a heat sink.

[Example 2]
FIGS. 4 to 12 show embodiments of the high-frequency transformer according to claims 1 and 4 according to the present invention in which the input / output coils have a plurality of layers and are each of the forced cooling systems using a cooling fluid.

  In this case, in the transformer of the first embodiment, the input / output coil 2 is formed in a double layer, and the end annular inner peripheral conductive plate portion and the end annular outer peripheral conductive plate portion of the secondary winding 4 between adjacent ones are provided. Is a single-ended annular inner and outer peripheral surrounding conductive plate portion 21, and the conductive bridge plate portions of the secondary winding 4 are continuous conductive bridge plate portions 22 and 23. Thereby, simplification of the structure and miniaturization can be promoted. 4 to 11, the input / output coil 2 is a double layer, but it may be a triple layer or more.

  FIGS. 7 to 9 are external views of the second embodiment. As shown in FIGS. 10 to 12, a resin mold of a synthetic resin is further appropriately applied thereto, so that almost the entire transformer is molded resin 24. It may be covered with. 7 to 12, reference numerals 25 and 26 denote input terminals provided at the lead-out ends 15 and 16 of the primary winding 3, reference numeral 27 denotes a cooling fluid inlet connected to one lead-out end 15 of the primary winding 3, and 28 Is a cooling fluid discharge port connected to the other drawing end 16 of the primary winding 3, and 29 is a mounting bracket.

  Here, in the case of the first embodiment shown in FIGS. 1 to 3, the case of the second embodiment shown in FIGS. 4 to 9, and the case of the conventional example shown in FIGS. When measured, the following results were obtained.

From this measurement result, it is clear that the leakage inductance is remarkably improved.

[Example 3]
FIGS. 13 to 18 show an embodiment of a high-frequency transformer corresponding to claims 1 and 3 according to the present invention in which the input / output coil is single and the system is a natural air cooling system.

  The high-frequency transformer shown in FIG. 13 to FIG. 18 is the same as the high-frequency transformer of the first embodiment. Formed. Thus, by forming the primary winding 30 with a rectangular conductor, it is possible to ensure the superiority to the skin effect. Others are the same as in the case of the first embodiment, and a description thereof will be omitted. As in the above-described embodiment, the input / output coil 2 may be formed in a plurality of layers, and in the case of a plurality of layers, the end ring inner peripheral surrounding conductive plate portion 5 and the end ring outer periphery between the adjacent secondary windings 4 The surrounding conductive plate 6 may be a single-ended annular inner / outer peripheral surrounding conductive plate 21 and the conductive bridge plates 9 and 10 may be continuous conductive bridge plates 22 and 23, and the input / output coil 2 may be a rectangular tube. Alternatively, it may be cylindrical. If it is cylindrical, edgewise winding with a rectangular wire in the primary winding 30 is facilitated. FIGS. 16 to 18 show external views of the third embodiment, in which 31 and 32 are input terminals provided at the lead-out end portions 33 and 34 of the primary winding 30.

DESCRIPTION OF SYMBOLS 1 Core 2 Input / output coil 3 Primary winding 4 Secondary winding 5 Ended annular inner periphery surrounding conductive plate part 6 Ended annular outer periphery surrounding conductive plate part 7, 8 Ring end part 9, 10 Conductive bridge plate part 11, 12 Connection end portions 13 and 14 Output terminals 15 and 16 Lead end portions 17 Window holes 18 and 19 Electrical insulating paper 20 Electrical insulating material 21 Ended annular inner and outer peripheral surrounding conductive plate portions 22 and 23 Continuous conductive bridge plate portion 24 Resin mold 25, 26 Input terminal 27 Cooling fluid inlet 28 Cooling fluid outlet 29 Mounting bracket 30 Primary windings 31, 32 Input terminals 33, 34 Lead end

Japanese Patent Publication No. 48-17806 Japanese Examined Patent Publication No. 62-62425 JP-A-8-148346 JP 2008-210972 A

In order to achieve the above object, a high-frequency transformer according to claim 1 of the present invention is provided with an end ring-shaped inner peripheral surrounding conductive plate portion in the vicinity of an inner periphery and an outer periphery of a primary winding wound in a cylindrical shape. Ended annular outer periphery surrounding conductive plate portion is arranged with the position of the ring end portion in common, and the side edges of both conductive plate portions are connected to each other by the conductive bridge plate portion, A high-frequency transformer in which an input / output coil is formed by forming a secondary winding having a wide secondary current region extending to both the outside and the input / output coil is fitted to the core by a single or multiple layers. There,
The input / output coil has a plurality of layers, and the adjacent annular inner peripheral surrounding conductive plate portions and the end annular outer peripheral surrounding conductive plate portions located adjacent to each other between the end annular outer peripheral surrounding conductive plate portions are single-ended. And a series of the conductive bridge plate portion,
A window hole is opened in each layer of the input / output coil in the conductive bridge plate portion, and the leading end of the primary winding of each layer of the input / output coil corresponding to the window hole is exposed to the outside through each window hole. It is characterized by being pulled out .

As a result, the secondary winding is formed by the end annular inner periphery surrounding conductive plate portion facing the inside and outside of the primary winding, the end annular outer periphery surrounding conductive plate portion, and the conductive bridge plate portion connecting these, and the primary winding The winding is not only sandwiched between the inner and outer ends of the secondary annular winding with the end ring inner peripheral conductive plate portion and the end ring outer peripheral conductive plate portion at a close distance from each other, but also the conductive bridge plate. In combination with this part, the secondary winding is generally encased in the secondary winding. Therefore, leakage of magnetic flux from the primary winding to the outside is completely prevented, and most of the magnetic flux generated in the primary winding is prevented. All of them are linked to the secondary winding, so that the leakage inductance and the magnetic coupling between the windings can be remarkably improved. In addition, the secondary winding has a current region that is doubled by both the end-annular inner peripheral conductive plate portion and the end-annular outer peripheral conductive plate portion due to the presence of the conductive bridge plate portion. It can be secured with a wide area and can sufficiently cope with a large output. Of course, the primary winding can be made of a conductive pipe or a flat conductor capable of circulating a cooling fluid, and the superiority to the skin effect can be secured. Thus, it is possible to increase the capacity, compactly and concisely combine them in a state suitable for high output, and reduce or eliminate noise. Furthermore, the input / output coil is fitted to the core in a single layer or multiple layers, and does not enclose the core inside, so there is no need to forcibly cool the core itself from the outside, and the size is reduced. It is possible to simplify the structure, simplify and facilitate the production, and reduce the cost.
Further, with the above configuration, the structure and production can be simplified, and downsizing and cost reduction can be achieved.

It is a cutting top view which shows the reference example of the high frequency transformer concerning this invention. It is a cutting front view of the same example . It is a perspective view of the principal part of the example . BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing a first embodiment of a high-frequency transformer according to the present invention. It is a cutting front view of the first embodiment. It is a perspective view of the principal part of the Example 1. FIG. It is an external appearance top view of the Example 1. FIG. It is an external appearance front view of the Example 1 . It is an external appearance side view of the Example 1 . It is a synthetic resin mold external appearance top view of the Example 1. FIG. It is a synthetic resin mold external appearance front view of the Example 1. FIG. It is a synthetic resin mold external appearance side view of the Example 1 . It is a cutting top view which shows Example 2 of the high frequency transformer which concerns on this invention. It is a cutting front view of the same Example 2 . It is a perspective view of the principal part of the Example 2 . It is an external appearance top view of the Example 2. FIG. It is an external appearance front view of Example 2 . It is an external appearance side view of the Example 2. FIG. It is a cutting top view of a prior art example. It is a cutting front view of the same example. It is a perspective view of the principal part of the example.

[ Reference example ]
1 to 3 show a reference example of engaging Ru high-frequency transformer to the present invention in which the input and output coils with forced cooling system with a single Toshikatsu cooling fluid.

In the high-frequency transformer shown in FIGS. 1 to 3, a single input / output coil 2 is fitted to an outer iron type core 1 in which a plurality of ferrite cores are combined via an electrical insulating paper 18, and the input / output coil 2 is sandwiched between the inner circumference and the outer circumference of the primary winding 3 wound in a cylindrical shape, with the end ring inner circumference surrounding conductive plate portion 5 and the end ring outer circumference surrounding conductive plate portion 6 in a short distance. In addition, the ring end portions 7 and 8 are arranged at the same position, and the side edge portions of both conductive plate portions are connected to each other by the conductive bridge plate portions 9 and 10 so that the inner side and the outer side of the primary winding 3 are connected to each other. Are formed in the secondary winding 4 of one turn having a wide secondary current region, and the connection end portions 11 and 12 are protruded outward from both ends of the end annular outer peripheral surrounding conductive plate portion 6. The output terminals 13 and 14 are attached to these connection ends. In assembling the primary winding 3 and the secondary winding 4, the secondary winding 4 is divided at an appropriate position to thereby form two or more members or the above-described plate portions 5, 6, 9, It is preferable that each of the ten divided bodies is combined with the primary winding 3 and then the members are electrically and mechanically joined and integrated by soldering or the like. The lead-out end portions 15 and 16 of the primary winding 3 are provided with a window hole 17 in the conductive bridge plate portions 9 and 10 and are drawn out through the window hole. 1 to 3, the input / output coil 2 is formed in a rectangular tube shape, but may be formed in a cylindrical shape or the like. This is not limited to the reference example , and the same applies to examples described later .

[Example 1 ]
4 to 11 show an embodiment of the high-frequency transformer according to the present invention in which the input / output coils are formed in a plurality of layers and each is a forced cooling system using a cooling fluid.

In this case, in the transformer of the above-described reference example , the input / output coil 2 is made into a double layer, and the end annular inner peripheral conductive plate portion and the end annular outer peripheral conductive plate portion of the secondary winding 4 between adjacent ones are provided. A single-ended annular inner and outer peripheral surrounding conductive plate portion 21 is used, and the conductive bridge plate portions of the secondary winding 4 are continuous conductive bridge plate portions 22 and 23. Thereby, simplification of the structure and miniaturization can be promoted. 4 to 11, the input / output coil 2 is a double layer, but it may be a triple layer or more.

FIGS. 7 to 9 are external views of the first embodiment. As shown in FIGS. 10 to 12, a resin mold of a synthetic resin is further appropriately applied thereto, so that almost the entire transformer is molded resin 24. It may be covered with. 7 to 12, reference numerals 25 and 26 denote input terminals provided at the lead-out ends 15 and 16 of the primary winding 3, reference numeral 27 denotes a cooling fluid inlet connected to one lead-out end 15 of the primary winding 3, and 28 Is a cooling fluid discharge port connected to the other drawing end 16 of the primary winding 3, and 29 is a mounting bracket.

Here, the leakage inductance is measured in the case of the reference example shown in FIGS. 1 to 3, the case of the embodiment 1 shown in FIGS. 4 to 9, and the case of the conventional example shown in FIGS. As a result, the following results were obtained.

From this measurement result, it is clear that the leakage inductance is remarkably improved.

[Example 2 ]
13 to 18 show an embodiment of a locking Ru high-frequency transformer to the present invention in which the input and output coils single Toshikatsu natural air cooling.

The high-frequency transformer shown in FIGS. 13 to 18 is the high-frequency transformer of the reference example described above, wherein the primary winding of the input / output coil 2 is turned into the primary winding 30 by a single or multi-ply cylindrical winding of a rectangular conducting wire. Formed. Thus, by forming the primary winding 30 with a rectangular conductor, it is possible to ensure the superiority to the skin effect. Others are the same as in the case of the reference example , and the description is omitted. As in the above-described embodiment, the input / output coil 2 may be formed in a plurality of layers, and in the case of a plurality of layers, the end ring inner peripheral surrounding conductive plate portion 5 and the end ring outer periphery between the adjacent secondary windings 4 The surrounding conductive plate 6 may be a single-ended annular inner / outer peripheral surrounding conductive plate 21 and the conductive bridge plates 9 and 10 may be continuous conductive bridge plates 22 and 23, and the input / output coil 2 may be a rectangular tube. Alternatively, it may be cylindrical. If it is cylindrical, edgewise winding with a rectangular wire in the primary winding 30 is facilitated. FIGS. 16 to 18 show external views of the second embodiment , in which 31 and 32 are input terminals provided at the lead-out end portions 33 and 34 of the primary winding 30.

In order to achieve the above object, a high-frequency transformer according to claim 1 of the present invention is provided with an end ring-shaped inner peripheral surrounding conductive plate portion in the vicinity of an inner periphery and an outer periphery of a primary winding wound in a cylindrical shape. With the end ring-shaped outer peripheral surrounding conductive plate part arranged in common with the position of the ring end part,
By connecting the one side edges of the two conductive plate portions with the first conductive bridge plate portion and the other side edges of the two conductive plate portions with the second conductive bridge plate portion, the primary winding is provided. A high-frequency transformer in which a secondary winding having a wide secondary current region extending both inside and outside the wire is formed to form an input / output coil, and the input / output coil is fitted to the core as a plurality of layers. There,
The adjacent annular inner peripheral surrounding conductive plate portion and the end annular outer peripheral surrounding conductive plate portion located between the layers of the input / output coils of the multiple layers as a single end annular inner peripheral surrounding conductive plate portion, And, the first conductive bridge plate portions of each of the input and output coils, and the second conductive bridge plate portions are a series of each,
A window hole is opened for each layer of the input / output coil in the first conductive bridge plate part and the second conductive bridge plate part, and one of the primary windings of each layer of the input / output coil corresponding to the window hole is drawn out. The end portion is drawn out to the outside through the window hole of the first conductive plate portion, and the other lead end portion of the primary winding is drawn to the outside through the window hole of the second conductive plate portion. And

As a result, the end winding annular inner periphery surrounding conductive plate portion and the end end annular outer periphery surrounding conductive plate portion facing the inner and outer sides of the primary winding close to each other and the two conductive bridge plate portions (the first conductive conductor) connecting them. Bridge plate portion and second conductive bridge plate portion), and the primary winding is an inner side and an outer side at the end annular inner peripheral conductive plate portion and the end annular outer peripheral conductive plate portion of the secondary winding. In addition to being sandwiched between them at a short distance from each other, they are generally encased in the secondary winding together with the conductive bridge plate portion, so that the magnetic flux from the primary winding to the outside Leakage is completely prevented, and almost all the magnetic flux generated in the primary winding is linked to the secondary winding, so that the leakage inductance and the magnetic coupling between the windings can be remarkably improved. In addition, the secondary winding has a current region that is doubled by both the end-annular inner peripheral conductive plate portion and the end-annular outer peripheral conductive plate portion due to the presence of the conductive bridge plate portion. It can be secured with a wide area and can sufficiently cope with a large output. Of course, the primary winding can be made of a conductive pipe or a flat conductor capable of circulating a cooling fluid, and the superiority to the skin effect can be secured. Thus, it is possible to increase the capacity, compactly and concisely combine them in a state suitable for high output, and reduce or eliminate noise. Furthermore, the input / output coil is fitted to the core in a single layer or multiple layers, and does not enclose the core inside, so there is no need to forcibly cool the core itself from the outside, and the size is reduced. It is possible to simplify the structure, simplify and facilitate the production, and reduce the cost.
Further, with the above configuration, the structure and production can be simplified, and downsizing and cost reduction can be achieved.

In the high-frequency transformer shown in FIGS. 1 to 3, a single input / output coil 2 is fitted to an outer iron type core 1 in which a plurality of ferrite cores are combined via an electrical insulating paper 18, and the input / output coil 2 is sandwiched between the inner circumference and the outer circumference of the primary winding 3 wound in a cylindrical shape, with the end ring inner circumference surrounding conductive plate portion 5 and the end ring outer circumference surrounding conductive plate portion 6 in a short distance. to and with disposed by common position of the ring end 7,8, the first conductive bridge plate portion 9 side edges mutual one Ryoshirubedenban portion (upward in FIG. 2), also two conductive By connecting the side edges of the other side of the plate part (lower side in FIG. 2) with the second conductive bridge plate part 10 , a wide secondary current region extending both inside and outside the primary winding 3 is provided. Formed on the secondary winding 4 of one turn, and further from both ends of the end ring-shaped outer peripheral surrounding conductive plate portion 6. Write the connecting end portions 11 and 12 is protruded to, and attached to the output terminals 13 and 14 to these connecting ends. In assembling the primary winding 3 and the secondary winding 4, the secondary winding 4 is divided at an appropriate position to thereby form two or more members or the above-described plate portions 5, 6, 9, It is preferable that each of the ten divided bodies is combined with the primary winding 3 and then the members are electrically and mechanically joined and integrated by soldering or the like. One of the lead end 15 of the primary winding 3, the other lead-out end portion 16 of the first through the window hole 17 bored in the conductive bridge plate portion 9, also the primary winding 3, the second conductive bridge plate Each is pulled out through the window hole 17 formed in the portion 10 . 1 to 3, the input / output coil 2 is formed in a rectangular tube shape, but may be formed in a cylindrical shape or the like. This is not limited to the reference example, and the same applies to examples described later.

In this case, in the transformer of the above-described reference example, the input / output coil 2 is made into a double layer, and the end annular inner peripheral conductive plate portion and the end annular outer peripheral conductive plate portion of the secondary winding 4 between adjacent ones are provided. A single-ended annular inner and outer peripheral surrounding conductive plate portion 21 is used, and the first conductive bridge plate portion 9 and the second conductive bridge plate portion 10 of the secondary winding 4 are continuous conductive bridge plate portions 22 and 23. Thereby, simplification of the structure and miniaturization can be promoted. 4 to 11, the input / output coil 2 is a double layer, but it may be a triple layer or more.

The high-frequency transformer shown in FIGS. 13 to 18 is the high-frequency transformer of the reference example described above, wherein the primary winding of the input / output coil 2 is turned into the primary winding 30 by a single or multi-ply cylindrical winding of a rectangular conducting wire. Formed. Thus, by forming the primary winding 30 with a rectangular conductor, it is possible to ensure the superiority to the skin effect. Others are the same as in the case of the reference example, and the description is omitted. As in the above-described embodiment, the input / output coil 2 may be formed in a plurality of layers, and in the case of a plurality of layers, the end ring inner peripheral surrounding conductive plate portion 5 and the end ring outer periphery between the adjacent secondary windings 4 The surrounding conductive plate 6 may be a single-ended annular inner and outer peripheral surrounding conductive plate 21, and the first conductive bridge plate 9 and the second conductive bridge plate 10 may be continuous conductive bridge plates 22 and 23. The input / output coil 2 may have a cylindrical shape in addition to a square cylindrical shape. If it is cylindrical, edgewise winding with a rectangular wire in the primary winding 30 is facilitated. FIGS. 16 to 18 show external views of the second embodiment, in which 31 and 32 are input terminals provided at the lead-out end portions 33 and 34 of the primary winding 30.

1 Core 2 Input / output coil 3 Primary winding 4 Secondary winding 5 Ended annular inner peripheral conductive plate 6 Ended annular outer peripheral conductive plate 7, 8 Ring end
9 First conductive bridge plate
DESCRIPTION OF SYMBOLS 10 2nd conductive bridge board part 11 and 12 Connection edge part 13 and 14 Output terminal 15 and 16 Draw-out edge part 17 Window hole 18 and 19 Electrical insulation paper 20 Electrical insulation material 21 Ended annular inner and outer periphery surrounding conductive board part 22, 23 Continuous conductive bridge plate 24 Resin mold 25, 26 Input terminal 27 Cooling fluid inlet 28 Cooling fluid outlet 29 Mounting bracket 30 Primary winding 31, 32 Input terminal 33, 34 Lead end

Claims (4)

  In the vicinity of the inner periphery and outer periphery of the primary winding wound in a cylindrical shape, an end-ring inner peripheral encircling conductive plate portion and an end-annular outer peripheral encircling conductive plate portion are arranged with a common ring end position. In addition, by connecting the side edges of the two conductive plate portions with the conductive bridge plate portion, a secondary winding having a wide secondary current region extending both inside and outside the primary winding is formed. A high-frequency transformer comprising an input / output coil and having the input / output coil fitted to a core in a single or multiple layers.   The primary winding is formed of a conductive pipe capable of circulating a cooling fluid, the gap inside the secondary winding is filled with a heat conductive electrical insulating material, and the cooling fluid flowing in the conductive pipe The high-frequency transformer according to claim 1, wherein both the secondary windings are cooled.   2. The high frequency transformer according to claim 1, wherein the primary winding is formed of a flat wire.   The input / output coil has a plurality of layers, and the adjacent annular inner peripheral surrounding conductive plate portions and the end annular outer peripheral surrounding conductive plate portions located adjacent to each other between the end annular outer peripheral surrounding conductive plate portions are single-ended. 4. The high-frequency transformer according to claim 1, wherein the conductive bridge plate portion is a series.