JP2000150259A - High frequency coil and transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high frequency coil, in which heat radiation can be made satisfactory, the number of winding increased, and tap can be easily extracted. SOLUTION: Plural U-shaped plate conductors 2 are accumulated while the terminal parts are connected successively and spirally, and the plate conductors 2 are insulated by removing the connected terminal part so that a high frequency coil 1 is constituted. The heat radiation of the high frequency coil 1 constituted of the laminated body of the plate conductors 2 can be made superior by increasing the surface area, and the number of winding can be readily increased by increasing the number of laminated layers. Also, the number of winding can be sharply increased or decreased, by increasing or decreasing the number of laminated layers. Moreover, an intermediate tap can be interposed in the middle of the laminated plate conductors 2 and can be extracted freely.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency coil useful for an induction heating device or a reactor, and a high-frequency transformer using the same.

[0002]

2. Description of the Related Art As a conventional high-frequency coil, a coil wound around a litz wire in which dozens to hundreds of enamel wires are bundled,
Known are those for winding a water-cooled metal pipe and those for winding a wide band-shaped conductor for high power of several kW or more.

[0003]

However, the above-mentioned conventional high-frequency coil has the following problems. (1) The heat radiation at the center of the lower layer is poor, and large power cannot be handled. (2) It is difficult to increase the number of turns (). (3) It is difficult to output an intermediate tap (,,). (4) It is difficult to make design changes and site modifications. (5) The internal shape of the coil (magnetic path cross-sectional shape) is limited. Therefore, an object of the present invention is to provide a high-frequency coil and a high-frequency transformer using the same, which can easily deal with these problems.

[0004]

SUMMARY OF THE INVENTION According to the present invention, a plurality of same-shaped plate conductors formed in a semi-closed shape so as to partially surround a magnetic path space are stacked while their ends are sequentially connected in a spiral manner. A high-frequency coil is constituted by insulating the flat conductors from each other except for the connection end, thereby solving the above-mentioned problem (claim 1). Various shapes such as U-shape, S-shape, C-shape, L-shape, V-shape, W-shape, and M-shape can be used as the shape of the semi-closed plate conductor as described later. It is. The connection between the plate conductors is performed by pressure welding or joining such as soldering or brazing. The high-frequency coil formed of such a laminated body of flat conductors has a large surface area and thus has excellent heat radiation properties, and can easily adjust the number of windings by increasing or decreasing the number of laminated layers.
Further, the intermediate tap can be freely pulled out from the middle of the laminated plate conductor. In this case, it is preferable that the lead terminal of the intermediate tap is formed by sandwiching a strip-shaped flat conductor between the conductors at the connection end of the flat conductor.

If the flat conductors are formed asymmetrically and irregularities occur on the outer peripheral surface when a plurality of the flat conductors are stacked, the irregular portions can serve as cooling fins to enhance the cooling effect. (Claim 3). on the other hand,
When the flat conductor is formed by laminating a plurality of thin plates, flexibility is generated and handling becomes easy, and it is effective for suppressing the skin effect of high-frequency current (claim 4). In this case, if the thin plates are partially insulated, the effect of suppressing the skin effect is further enhanced (claim 5). Further, when the flat conductor is formed by laminating a plurality of thin plates, the thin plates of the flat conductor to be connected to each other are preferably staggered at the connection end thereof, thereby forming the connecting portion. The contact resistance can be greatly reduced (claim 6).

A cooling water pipe can be joined to the outer peripheral surface of the flat conductor to enhance the cooling performance, thereby allowing a large current to flow. The cooling performance can also be enhanced by inserting a spacer made of an insulator between the plate conductors to form a gap and allowing air to flow through the gap. In this case, the gap can also serve as insulation between the flat conductors.

[0007] If the ends of the flat conductors are butt-connected to each other so as to be able to freely contact and separate from each other, it is possible to divide the coil at the connection ends, and for example, it is easy to take in and out the work in the induction heating device. 10). In this case, if the abutting surfaces of the connection ends are formed in a wedge shape, the engagement of the connection portions can be made smooth and the contact pressure can be increased (claim 11).

A high frequency transformer can be constructed by combining a primary coil and a secondary coil comprising the high frequency coil described in claim 1 (claim 12). Further, if a secondary coil in which a flat conductor is wound in a cylindrical shape is provided inside the primary coil comprising the high-frequency coil described in claim 1, a huge current can flow through the secondary coil (claim 13). In this case, if a cooling water pipe is provided inside the secondary coil, the secondary coil through which a huge current flows can be effectively cooled (claim 14).

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS.
An embodiment of the present invention will be described. 1 to 3 show a basic embodiment of a high-frequency coil. FIG. 1A is a plan view of the high-frequency coil, FIG. 1B is a side view of FIG. 1A, and FIG. 1A is a front view, FIG. 2D is a circuit diagram, FIG. 2A is a plan view of the flat conductor in FIG. 1, FIG. 2B is a front view thereof, and FIG. FIG. In FIG. 1, a high-frequency coil 1 is configured by stacking flat conductors 2 via an insulating layer 3 by a method described later, and has a strip-shaped terminal plate 4 on both upper and lower surfaces of which terminals U and V at both ends of the coil are formed. After being stacked on each other,
It is fastened by four bolts 6 and nuts 7 via two upper and lower insulating holding plates 5.

In FIG. 2, a flat conductor 2 is formed in a U-shape (or U-shape) having a rectangular outer shape by punching from a plate material. The insulating layer 3 is formed of an insulating sheet, and is formed in an L-shape to cover the remaining portion of the flat conductor 1 excluding one leg 2a. The insulating layer 3 can be a coating film instead of the sheet material.

In order to assemble the high-frequency coil 1 shown in FIG. 1 using the flat conductor 2 shown in FIG. 2, in FIG. 3, two lower holding plates 5 are arranged in parallel as shown in FIG. As shown in (B), after the terminal plates 4 of the terminals U are overlapped at right angles, the flat conductors 2 are placed thereon as shown in (C) to (E).
Are stacked in the required number, and the terminal plate 4 of the terminal V is stacked thereon as shown in (F). Finally, the two upper holding plates 5 are placed in parallel as shown in (G), and Plate 5,
The five spaces are tightened with the bolts and nuts 6 and 7 as described above. Holes 8 at both ends of the holding plate 5 are for passing bolts 6 (FIG. 1).

Here, the flat conductor 2 shown in FIGS.
In the stacking operation of (1), a unit in which the insulating layer 2 is stacked on the upper surface of the flat conductor 2 (FIG. 2) is sequentially stacked while inverting the direction by 180 °. This allows
In FIG. 3, the bare lower surface of the left leg of the flat conductor 2 of FIG. 3D contacts the bare upper surface of the left leg 2a of the flat conductor 2 of FIG. The bare lower surface of the right leg of the flat conductor 2 in (E) comes into contact with the bare upper surface of the right leg, and as a result, the bare ends are sequentially spirally connected to each other. The existing flat conductors 2 are insulated from each other, and the three flat conductors 2 of FIGS.
A coil of turns (0.5 turns with one flat conductor 2) is formed. Thereafter, by repeating this, an arbitrary number of turns can be obtained.

In FIG. 3, the terminal plate 4 of the terminal U is in contact with the bare lower surface of the right leg of the lowermost flat conductor 2, and the terminal plate 4 of the terminal V is on the left side of the uppermost flat conductor 2. They are connected to both ends of the high-frequency coil 1 in contact with the bare upper surfaces of the legs. The contact surface between the flat conductor 2 and the terminal plate 4 is
Due to the tightening by the bolts 6, the contact surfaces are pressed against each other. It should be noted that joining may be performed by soldering, brazing, or the like instead of pressing. FIG. 1D shows a circuit configuration of such a high-frequency coil 1. FIG. 1 (D)
In order to pull out the intermediate tap V ′ shown in FIG. 1 to an arbitrary position, as shown in FIG. 1 (D), the terminal plate 4 ′ may be inserted at a required place. The intermediate tap V 'can have an arbitrary number of turns by sandwiching the terminal plate 4' at an arbitrary position.

On the other hand, in FIG. 2, the plate conductor 2 has a dimension a> b, that is, the right and left sides are asymmetric with respect to the center C on the left and right sides of the magnetic path. Such a flat conductor 2 is 180
Fig. 1
As shown in (C), irregularities occur on the left and right outer peripheral surfaces.
The irregularities serve as cooling fins and are effective for cooling the high-frequency coil 1 that generates heat when energized. Note that this asymmetry can be provided not only on the left and right but also on the front and back, and the shape of the plate conductor 2 is not limited to the illustrated gate shape as described later. Can be set.

FIG. 4 shows a different embodiment. In FIG. 4, the flat conductor 2 is U-shaped, as in FIG. 3, but in this embodiment, the flat conductor 2 is turned 90 degrees at a time and their ends are connected in a spiral fashion. It stacks while doing. In that case,
The insulating layer 3 is provided so as to cover a portion of the one leg portion serving as a connecting portion of the flat plate conductor 2 except for the tip portion 2a, and the bare upper surface of the connecting end portion 2a and the other leg of the next flat plate conductor 2 A helical connection is made by contact with the bare lower surface of the tip portion 2b of the portion. In this connection, a coil of 0.75 turns can be obtained with one flat conductor 2. In this embodiment, the contact area between the plate conductors 2 is smaller than in the embodiment of FIG. 3, but a larger number of turns can be obtained with a smaller number of plate conductors 2. Also, as shown in FIG.
In this case, the holding plate 5 (FIG. 1) can be omitted and tightened, and the size can be reduced.

If the outer shape of the flat conductor 2 is made rectangular as shown above, the conductor material can be used without waste.
This outer shape is basically free and can be arbitrarily selected such as a circle or a polygon. Also, the shape of the inner side (magnetic path) can be freely formed such as a circle, a cocoon, a triangle, a star, and the like in addition to a square.

FIG. 5 shows an embodiment in which the flat conductor 2 is formed by laminating a plurality of thin plates 2 '. As a result, there is an advantage that the flat plate conductor 2 becomes flexible and its handling becomes easy, and the skin effect of the high-frequency current is suppressed. In that case, the in-conductor insulating layer 9 for insulating between the thin plates 2 ′
The effect of suppressing the skin effect is further enhanced by providing. Also,
When the flat conductors 2 are stacked and spirally connected, as shown in FIG. 6, if the thin plates 2 'of the flat conductors 2 to be connected to each other are alternately overlapped at their connection ends, the contact resistance of the connection portion is reduced. Can be reduced to 1 / the number of thin plates 2 ′. Further, when the flat conductors 2 are formed by laminating the thin plates 2 ′, the number of thin plates per flat conductor 2 is adjusted so that the current carrying capacity (proportional to the number of laminations) and the number of coil turns ( It can be increased by reducing the number of layers)
Can be corrected, and it is possible to flexibly cope with a design change or the like after a practical test. In the embodiment described above,
Although the example of the U-shaped flat conductor 2 has been described, a high-frequency coil can be formed with a half-open arbitrary flat conductor such as a C-shape, an L-shape, or a V-shape according to the same principle. Can be.

FIG. 7 shows an embodiment in which a cooling water pipe 10 is joined to the outer peripheral surface (the end surface of a U-bent portion in the case of the drawing) of the flat conductor 2 by brazing or soldering. The cooling water pipe 10 is formed by flattening a circular pipe except for both ends to which the hose 11 is connected so that the cooling water pipe 10 does not hit when the flat conductors 2 are stacked. It has been shaken. Water cooling, in which cooling water is passed through the cooling water pipe 10, has much better cooling capacity than air cooling, and can greatly increase the current-carrying capacity of the high-frequency coil. In order to transfer the heat generated in the inner part of the plate conductor 2 to the cooling water pipe 10, the thickness of the plate conductor 2 is more advantageous, and when the plate conductor 2 is formed by laminating a plurality of conductor plates, the cooling water The conductor plate for joining the pipe 10 is preferably a thick plate, and thin plates may be stacked on both sides thereof.

FIGS. 8A and 8B show an embodiment in which an insulating spacer is inserted between the flat conductors 2. FIG. 8A is a plan view and FIG. 8B is a side view thereof. In FIG. 8, a spacer 12 cut out from an insulating pipe is inserted into each of the four corners for each turn of a coil made up of two flat conductors 2, and a bolt 6 and a nut 7 penetrating this portion via an insulating washer 13. And are tightened together. A gap 14 is created between the flat conductors by the insertion of the spacer 12, and air flows through the gap 14, thereby improving the cooling performance. As shown in the figure, if the air is blown by the cooling fan 15, the cooling performance is further enhanced. In addition, due to the formation of the gap 14, the insulating layer 3 (FIG. 1) to be inserted into this portion can be omitted.

FIGS. 9A and 9B show an embodiment of a high-frequency coil constructed by butt-connecting the ends of flat conductors so as to be able to come and go. FIG. 9A is a side view, and FIG. −
FIG. 10 is a cross-sectional view taken along the line B, and FIG. 10 shows a segment forming a flat conductor, (A) is a side view, and (B) is a right front view thereof. The segment 16 is stamped and formed from a plate conductor, and as shown in FIG. 10, a U-shaped portion in which a portion to be a magnetic path 17 (FIG. 9) is cut out in a semicircle, and one end of both leg portions is obliquely deleted. Thus, a slope 16a is provided, and a semicircular notch 19 through which an insulating bolt 18 (FIG. 9) is passed is provided on the opposite side. In order to cause the irregularities as the cooling fins already described,
It is formed asymmetrically on the left and right.

As shown in FIG. 9, two segments 16 are overlapped so that the slope 16a is on the inside, and an upper flat conductor 20 having V-shaped grooves at the ends of both legs is formed.
Also, two sheets are stacked so that the slope 16a is on the outside, and a lower flat conductor 21 having A-shaped protrusions at the ends of both legs is formed. These flat conductor 20 and flat conductor 21 are:
The groove at the end and the protrusion are sequentially butted in a spiral shape to form a high-frequency coil. Here, the flat conductor 20 is overlapped between a pair of left and right insulating side plates 22 via an insulating sheet 23 shown in FIG. 11, and a hole in one of the side plates 22 and a notch 19 of the flat conductor 20 (FIG. 10). And is integrally fastened by an insulating bolt 18 screwed into a screw hole of the other side plate 22. Similarly, the lower flat conductor 21 is overlapped between a pair of left and right insulating side plates 24 via an insulating sheet 23 and integrally fastened by insulating bolts 18. The core of the insulating bolt 18 is metal, but the surface is covered with an insulating material 18a.

The side plate 22 is hinged to the side plate 24 via a pin 25 at the left end in FIG. 9A, and pressed by a wing nut 26 at the right end. The wing nut 26 is screwed into the thread at the upper end of the holding rod 27,
The lower end of the holding rod 27 is a rod 28 passed between the side plates 24.
Is rotatably held in the center of the. The rod 28
A horizontal plate 29 is integrally formed so as to extend between the side plates 22, and a U-shaped groove 29 a into which the presser bar 27 is fitted is cut out at the center thereof. Therefore, as shown in FIG. 9, the presser bar 27 is fitted into the groove 29a, and the wing nut 2 is inserted.
When 6 is tightened, the butted ends of the flat conductor 20 and the flat conductor 21 are pressed against each other and are firmly connected by a wedge action. Also, loosen the wing nut 26 and presser bar 27
, The upper plate conductor 20 can be lifted, and the magnetic path 17 can be opened.

Such a high-frequency coil can be set in the high-frequency coil with one touch, for example, when heating a long object to be heated or a constricted portion of a gourd-shaped object to be heated. . In that case, the slope 16a
By stacking two segments 16 each having the same shape, the upper and lower plate conductors 20 and 21 can be formed by one type of segment 16. In addition, the engagement between the V-shaped groove and the A-shaped protrusion makes the engagement smooth,
A large contact pressure is obtained by the wedge action. Although not shown in the drawing, providing an insulating film on the mating surface of the two segments 16, particularly on a portion near the center of the magnetic path 17 where the current is concentrated, is effective in reducing the skin effect. .

FIG. 12 shows two stacked S-shaped conductors.
FIG. 12A shows an embodiment in which a high-frequency coil having two magnetic paths is configured. FIG. 12A is a plan view of a flat conductor, and FIG.
Is a plan view of the high-frequency coil, (C) is a side view thereof, (D)
Is a circuit diagram. In FIG. 12, the flat conductor 30 is formed in an S shape as shown in FIG.
0 are alternately stacked in an upside-down relationship via an insulating sheet 31 covering the illustrated range, so that the high-frequency coil 1 having two magnetic paths 32 and 33 as shown in FIG.
Are formed, and the terminals U and V are formed by a terminal plate 34 sandwiched between both ends of the coil. The current i flows as shown by the arrow, and generates a magnetic flux Φ shown in (D).

The direction of the magnetic flux Φ passing through the magnetic paths 32 and 33 is
Since they are opposite to each other as shown in FIG. 12 (D), the leakage magnetic fluxes cancel each other out and their influence on the surroundings is small.
This high-frequency coil is suitable for efficiently heating two adjacent objects to be heated. As shown by a chain line in (B) and (C), a reactor having a high loss coefficient Q can be manufactured by inserting a core having a low magnetic permeability for the reactor. In this embodiment, an example in which there are two magnetic paths is shown. For example, if a W-shaped or M-shaped flat conductor is used, a high-frequency coil having three magnetic paths can be formed. The above magnetic path can be made freely.

FIG. 13 shows an embodiment in which a high-frequency transformer is formed by combining a high-frequency coil made of a flat conductor as shown in FIG. 1 as a primary coil and a secondary coil, and FIG. Is a plan view, (B) is a right side view thereof, and (C) is a circuit diagram. For example, a matching transformer for induction heating often reduces the voltage of a high-frequency power supply such as a transistor inverter to multiply the current. In this case, as an example of such a case, the primary coil 35 is formed by stacking many thin flat conductors 2. The secondary coil 36 is formed by stacking one to two turns of a thick flat conductor 37,
6 is shown in three parallel arrangements and sandwiched between the plate conductors 2 of the primary coil 35.

The terminals u and v at both ends of the secondary coil 36 are formed by a pair of L-shaped terminal plates 39 which are vertically arranged with an insulating sheet 38 interposed therebetween, and are fastened to the terminal plate 39 by screws 40. Secondary conductors 41 are overlapped on both ends of the flat plate conductor 37 constituting the secondary coil 36. The terminal washer 4 forming the terminals U and V at both ends of the primary coil 35, the flat conductors 2 and 37, the insulating layer 3, the secondary conductor 41, and the like are formed by the bolts 6 and the nuts 7 penetrating the four corners to form the insulating washer 13. Are fastened together. An iron core should enter the magnetic path 42, but is omitted here. In the illustrated high-frequency transformer, since the secondary coil 36 can be closely inserted between the primary coils 35, leakage magnetic flux and leakage reactance are small and high performance is achieved.

FIG. 14 shows that a cylindrical 2
FIG. 14A is a plan view, FIG. 14B is a front view thereof, and FIG. 14C is a circuit diagram, showing an embodiment of a high-frequency transformer in which a secondary coil is arranged. In FIG. 14, a long cylindrical secondary coil 45 having one turn surrounding the annular core 44 is disposed inside the primary coil 43 similar to FIG. 13, and one turn of flattened cooling water is disposed inside the secondary coil 45. Two pipes 46 are joined. U, v terminals 45a, 4 of the secondary coil 45
5b is integrally formed at one end of the winding end portion that is stacked with the insulating sheet 47 interposed therebetween. If the secondary coil 45 is wound around the outside of the primary coil 43, the heat radiation of the primary coil 43 is hindered. The one-turn cylindrical secondary coil 45 can multiply a large current, and the heat generated by the huge current flowing through the secondary coil 45 is cooled by the cooling water pipe 46. The cooling water pipe 46 is also effective for cooling the iron core 44, thereby preventing the core 44 from being deteriorated in characteristics due to overheating. The long cylindrical secondary coil 45 has a small leakage reactance, and a high-performance high-frequency transformer can be obtained.

[0029]

As described above, according to the present invention, the following advantages can be obtained by stacking flat conductors, as compared with the conventional wound high-frequency coil. (1) Since the conductor has a large surface area, the heat dissipation is high, and a large power can be easily handled by providing a gap between the flat conductors or joining a cooling water pipe to the flat conductor. (2) It is easy to increase the number of turns by increasing the number of flat conductors, and the number of turns can be easily corrected by increasing or decreasing the number of flat conductors. (3) Since the tap can be formed by sandwiching the terminal plate, the tap can be easily formed and the tap position can be easily changed. (4) High-frequency loss can be reduced by using a flat conductor in which thin plates are stacked. (5) A high-frequency coil having a plurality of magnetic paths can be easily configured. (6) Since the primary winding and the secondary winding can be brought into close contact, a high-frequency transformer having a small leakage reactance can be configured. (7) Since a high-frequency coil that can be divided into two by one touch can be easily configured, it is possible to appropriately cope with a long or constricted object to be heated. (8) High-frequency coils with different current capacities and different numbers of windings can be obtained only by adjusting the number of sheets using a single type of flat conductor, and work such as bending or joining is not required because the flat conductors only need to be stacked. It is possible to meet various specifications in a short delivery time with a small variety of parts inventory.

[Brief description of the drawings]

FIG. 1 shows a high-frequency coil according to an embodiment of the present invention, wherein (A) is a plan view, (B) is a side view, (C) is a front view, and (D) is a circuit diagram.

2A and 2B show a flat conductor in FIG. 1, wherein FIG. 2A is a plan view and FIG. 2B is a front view.

3A and 3B are plan views showing a procedure for assembling the high-frequency coil of FIG. 1, wherein FIG. 3A is a lower holding plate, FIG.
(C) is the bottom plate conductor, (D) is the plate conductor stacked thereon, (E) is the plate conductor further stacked thereon, (F) is the other terminal plate, and (G) is the upper portion. It is a holding plate.

FIG. 4 is a plan view showing a procedure for assembling a high-frequency coil according to a different embodiment of the present invention, wherein (A) is one terminal plate, (B) is the lowermost plate conductor, and (C) is on it. The flat conductors to be stacked, (D) is the other terminal board.

5A and 5B show a plate conductor in which thin plates are stacked, wherein FIG. 5A is a plan view, FIG. 5B is a side view, and FIG. 5C is a front view.

6 is a front view showing a state in which the plate conductors of FIG. 5 are connected by alternately stacking thin plates.

FIG. 7 shows a plate conductor joined to a cooling water pipe,
(A) is a plan view, (B) is a side view, and (C) is a front view.

8A and 8B show a high-frequency coil according to still another embodiment of the present invention, wherein FIG. 8A is a plan view and FIG. 8B is a side view.

9A and 9B show a high-frequency coil according to still another embodiment of the present invention, wherein FIG. 9A is a plan view and FIG. 9B is a side view.

10 shows an element of a flat conductor in FIG. 9,
(A) is a plan view and (B) is a side view.

FIG. 11 is a plan view showing the insulating sheet in FIG. 9;

12 shows a high-frequency coil according to still another embodiment of the present invention, wherein (A) is a plan view of a flat conductor, (B) is a plan view of a high-frequency coil, (C) is a side view, and (D) is a circuit. FIG.

FIG. 13 shows a high-frequency transformer according to an embodiment of the present invention, where (A) is a plan view, (B) is a side view, and (C) is a circuit diagram.

14A and 14B show high-frequency transformers according to different embodiments of the present invention, wherein FIG. 14A is a plan view, FIG. 14B is a front view, and FIG. 14C is a circuit diagram.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High frequency coil 2 Flat conductor 3 Insulating layer 4 Terminal plate 5 Holding plate 9 Insulating layer 10 Cooling water pipe 12 Spacer 14 Air gap 20 Flat conductor 21 Flat conductor 22 Side plate 23 Insulating sheet 24 Side plate 30 Flat conductor 31 Insulating sheet 34 Terminal plate 35 1 Primary coil 36 Secondary coil 37 Flat conductor 38 Insulating sheet 39 Terminal plate 41 Secondary conductor 43 Primary coil 44 Iron core 45 Secondary coil 46 Cooling water pipe 47 Insulating sheet

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) // H05B 6/36 H01F 31/00 CS (72) Inventor Yutaka Ito Arata Tanabe, Kawasaki-ku, Kawasaki-shi, Kawasaki-ku, Kanagawa Field No. 1 Fuji Electric Co., Ltd. F term (reference) 3K059 AA08 AA16 AD03 AD25 AD36 AD40 CD62 5E043 AA02 AB04 AB09 BA03 DA06 DB09 EA04 EA06 FA02 5E050 AA10 BA05

Claims (14)

[Claims] 1. A plurality of semi-closed flat conductors formed in a semi-closed shape so as to partially surround a magnetic path space while their ends are sequentially spirally connected to each other, and the flat conductors are connected to each other. A high-frequency coil characterized by being insulated from each other except for ends. 2. The high-frequency coil according to claim 1, wherein a lead terminal is formed by sandwiching a strip-shaped flat conductor between the conductors at the connection end. 3. The high-frequency coil according to claim 1, wherein said plate conductor is formed asymmetrically, and irregularities are generated on an outer peripheral surface when a plurality of said plate conductors are stacked. 4. The high frequency coil according to claim 1, wherein said flat conductor is formed by laminating a plurality of thin plates. 5. The high frequency coil according to claim 4, wherein said thin plates are insulated. 6. The high-frequency coil according to claim 4, wherein the thin plates of the flat conductors connected to each other are alternately overlapped at the connection end. 7. A high-frequency coil according to claim 1, wherein a cooling water pipe is joined to an outer peripheral surface of said flat conductor. 8. The high-frequency coil according to claim 1, wherein a gap is formed by inserting an insulating spacer between said plate conductors. 9. The high-frequency coil according to claim 8, wherein said gap serves also as insulation between said plate conductors. 10. The high-frequency coil according to claim 1, wherein ends of the flat conductors are butt-connected so as to be able to come and go freely. 11. The high-frequency coil according to claim 10, wherein the abutting surfaces of the connection ends are formed in a wedge shape. 12. A high-frequency transformer comprising a combination of a primary coil and a secondary coil comprising the high-frequency coil according to claim 1. 13. A high-frequency transformer comprising a primary coil comprising the high-frequency coil according to claim 1 and a secondary coil formed by winding a flat conductor in a cylindrical shape inside the primary coil. 14. The high-frequency transformer according to claim 13, wherein a cooling water pipe is provided inside the secondary coil. coil.