JPH0559817U - Secondary coil of high frequency heating coil power supply transformer - Google Patents

Abstract

(57) [Abstract] [Purpose] At the end portions 11 and 11, the passage of high frequency current is enlarged to increase the capacitance of the secondary coil 10 and the transformer. [Structure] The secondary coil 10 is composed of a conductor 19 having a rectangular cross-section formed in a substantially Ω shape, and the end portions 11, 11 of the conductor 19 are
The conductors 19 are arranged so as to face each other in the thickness direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a secondary coil of a transformer for feeding a high frequency heating coil.

[0002]

[Prior Art]

 Hereinafter, a conventional technique will be described with reference to the drawings. 7 and 8 are drawings for explaining a conventional secondary coil of a transformer for supplying power to a high-frequency heating coil, FIG. 7 is a perspective view, and FIG. 8 is a sectional view taken along the line DD of FIG. ..

The high-frequency heating coil power supply transformer includes a primary coil (not shown) formed in a substantially elliptical shape, and a secondary coil 20 provided so as to approach and face the primary coil. As shown in FIG. 7, the secondary coil 20 includes a conductor 29 formed in a substantially Ω shape, a substantially oval central opening 24 formed by the conductor 29, and an output terminal portion of the conductor 29. It has a pair of end portions 21, 21 to which a high-frequency heating coil (not shown) is connected, and a linear slit 23 communicating with the central opening 24 and provided between the end portions 21, 21.

The cross-sectional profile of the conductor 29 having a thickness t1 and a width h is rectangular. The pair of end portions 21, 21 are arranged so as to face each other through the slit 23 in the direction perpendicular to the thickness direction thereof. Note that a and b are the short sides and long sides of the rectangle formed by the outline of the cross section of the conductor 29, respectively. Further, in practice, an insulating plate (not shown) is inserted in the slit 23.

[0005]

[Problems to be solved by the device]

 When a high-frequency current is passed through such a secondary coil 20, the high-frequency current flows through the shortest path as much as possible. Therefore, at the end portions 21 and 21, especially the portions on both sides of the slit 23 (near the short side a). High frequency current concentrates on. This tendency becomes more remarkable as the frequency of the high frequency current increases. That is, since the passage of the high frequency current at the end portions 21, 21 becomes small, the allowable current of the secondary coil 20, and hence the capacity of the transformer is limited.

The present invention has been made in view of the above circumstances, in which the passage of high frequency current is enlarged at the end portion, and therefore the allowable current of the secondary coil and the capacitance of the transformer are increased. It is an object of the present invention to provide a secondary coil of a transformer for supplying power to a high frequency heating coil that can achieve the above.

[0007]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the secondary coil of the transformer for feeding the high-frequency heating coil according to claim 1 is made of a conductor having a rectangular cross section formed in a substantially Ω shape, and both ends of the conductor are opposed to each other. So that it is arranged in the thickness direction of the conductor.

The secondary coil of the transformer for supplying power to the high frequency heating coil according to claim 2 is formed of a conductor having a rectangular cross section formed in an approximately Ω shape, and the conductor is arranged so that both ends of the conductor face each other. Is disposed in a direction perpendicular to the thickness direction of the same, and the facing portions of the both end portions extend in the thickness direction by more than the thickness.

[0009]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 are drawings for explaining a first embodiment, FIG. 1 is a perspective view, FIG. 2 is a sectional view taken along the line AA in FIG. 1, and FIG. 3 is B in FIG. -B line cross-section explanatory drawing, FIG. 4 is CC cross-section sectional view of FIG.

As shown in FIG. 1, the secondary coil 10 includes a conductor 19 formed in a substantially Ω shape, a substantially oval central opening 14 formed by the conductor 19, and a pair of the secondary coil 10. And an end portion 11 which is an output terminal portion to which a high frequency heating coil (not shown) is connected. As shown in FIG. 4, the contour shape of the cross section of the conductor 19 is a rectangle having a thickness t1 and a width h. Similarly to the conductor 29, a and b are the short side and the long side of the rectangle formed by the contour of the cross section of the conductor 19, respectively.

As shown in FIGS. 2 and 3, the end portions 11, 11 are formed so that the thickness is t2 which is thinner than half the thickness t1 of the portion other than the end portions 11, 11. Moreover, the end portions 11 and 11 are arranged so as to face each other with a gap 13 therebetween in the thickness direction. The thickness t2 and the gap g are set such that the total length of the thickness t2 of each of the end portions 11 and 11 and the gap g of the gap 13 is equal to the thickness t1 of the conductor 19. In practice, an insulating plate (not shown) is inserted in the gap 13.

Next, the operation of the secondary coil 10 will be described. When a high-frequency current is applied to a primary coil (not shown), a high-frequency current is also generated in the secondary coil 10 due to the inductive action. It is guided to a high-frequency heating coil (not shown) connected to 11, 11.

At this time, the high-frequency current passing through the ends 11, 11 of the secondary coil 10 has a portion where the ends 11, 11 face each other, that is, both sides of the gap 13 (the long side b (Near). Therefore, in comparison with the fact that the high frequency current is concentrated near the short side a at the end of the secondary coil, at the ends 11 and 11 of the secondary coil 10 of this embodiment, a much higher high frequency current is obtained. Can be energized. Therefore, the capacity of the transformer using the secondary coil 10 of this embodiment can be increased.

FIG. 5 is a plan view of a secondary coil 10A as a modified example of the first embodiment. The secondary coil 10A is the same as the secondary coil 10 of the above embodiment except the following. That is, in the secondary coil 10A, the protruding portions 16 and 16 are formed in the portions 15 and 15 adjacent to the end portions 11 and 11 of the conductor 19 and on the side of the central opening 54 of the conductor 19, respectively.

As described above, since the high frequency current flows through the short cut, it tends to concentrate on the portions 15 and 15. Therefore, by providing the protrusions 16 and 16 on the portions 15 and 15, respectively, a larger high-frequency current can be flown to the portions 15 and 15. Therefore, the allowable current of the secondary coil 10A, that is, the secondary coil is reduced. It is possible to increase the capacity of the transformer that uses 10A.

FIG. 6 is a perspective view of the secondary coil 20A according to the second embodiment. The secondary coil 20A including a conductor 29 having a rectangular cross section formed in a substantially Ω shape has an end portion 21, The conductors 21 are arranged so as to face each other in the direction perpendicular to the thickness direction of the conductor 29. Rectangular and flat conductors 25, 25 wider than the thickness of the ends 21, 21 are attached to the opposite surfaces of the ends 21, 21 by brazing so as to be parallel to each other. A gap 23A having a predetermined distance is provided between the conductors 25. In practice, an insulating plate (not shown) is inserted in the gap 23A. The secondary coil 20A can also obtain the same effect as the secondary coil 10 of the first embodiment.

[0017]

[Effect of the device]

 As described above, the secondary coil of the transformer for supplying power to the high frequency heating coil according to claim 1 is arranged such that both ends of the conductor are opposed to each other in the thickness direction of the conductor. The secondary coil of the high-frequency heating coil power supply transformer described is arranged such that both ends thereof are arranged in a direction perpendicular to the thickness direction, and the opposing portions of both ends are equal to or larger than the thickness in the conductor thickness direction. It has been extended.

Therefore, the secondary coil of the high-frequency heating coil power supply transformer of the present invention has a wider passage for high-frequency current at both ends as compared with the conventional secondary coil, thus improving the allowable current of the secondary coil. It is possible to increase the capacity of the transformer.

[Brief description of drawings]

FIG. 1 is a perspective view of a first embodiment of the present invention.

2 is a cross-sectional view taken along the line AA of FIG.

3 is a cross-sectional view taken along the line BB of FIG.

4 is a cross-sectional view taken along the line CC of FIG.

FIG. 5 is a plan view of a modification of the first embodiment.

FIG. 6 is a perspective view of a second embodiment of the present invention.

FIG. 7 is a perspective view of a conventional secondary coil of a transformer for supplying power to a high frequency heating coil.

8 is a cross-sectional view taken along the line DD of FIG.

[Explanation of symbols]

 11, 21 Ends 19, 29 Conductor 25 Conductor h Width t1, t2 Thickness

Claims (2)

[Scope of utility model registration request] 1. A conductor having a rectangular cross-section formed in a substantially Ω shape, wherein both ends of the conductor face each other,
A secondary coil of a transformer for supplying power to a high frequency heating coil, wherein the secondary coil is arranged in the thickness direction of the conductor. 2. A conductor having a rectangular cross section formed in a substantially Ω shape, and the both ends of the conductor are opposed to each other,
A high frequency wave arranged in a direction perpendicular to the thickness direction of the conductor, and the opposing portions of the both ends extending in the thickness direction more than the thickness. Secondary coil of transformer for heating coil power supply.