JPH07312313A - Toroidal transformer and its assembling method - Google Patents

Abstract

PURPOSE:To advance miniaturizing and thinning of the toroidal transformer and easily and quickly assemble it. CONSTITUTION:A toroidal transformer is composed of an annular core 200, flexible base 100, main sheet coil pieces M1, M2,... and jumper sheet coil pieces J12.... The outer shape of the core 200 is circular, square, etc. The base 100 is disposed along the shape of the core 200, the coil pieces M1, N2,... are wound on the base 100 with leaving space regions D12,... the coil pieces J12,... are formed on these regions D12,... to connect the adjacent coil pieces M1, M2,....

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toroidal transformer and a method for assembling the same, and more particularly to a toroidal transformer used as a power transformer for electronic equipment such as a computer and a method for assembling the same.

[0002]

2. Description of the Related Art Generally, a toroidal transformer is an annular toroidal iron core with a copper wire wound around it, and the leakage flux is the smallest in the transformer. It is well known that the degree of the influence of In recent years, a switching power supply has been widely used in electronic devices as its size has been reduced. However, since this switching power supply uses a rectangular wave in terms of circuit configuration, noise is likely to occur, which may adversely affect surrounding elements and circuits. Therefore, the switching power supply may not be used for high-sensitive precision electronic devices or the like due to noise in spite of the miniaturization. On the other hand, there is still a strong demand for a toroidal transformer that does not generate such noise and, as described above, that generally has less electromagnetic interference, if it can be used as a power transformer if it can be made small and thin.

[0003]

However, the conventional toroidal transformer has the following problems. (1) It is difficult to mass-produce small and thin products. In the conventional toroidal transformer, a copper wire is wound around an annular toroidal iron core. Therefore, the conventional toroidal transformer becomes bulky by the amount of the copper wire wound around the toroidal iron core, and it is difficult to make a small-sized toroidal transformer and it is difficult to make it thin. If it is difficult to make a small and thin product, it is not suitable for mounting in electronic equipment that requires miniaturization, and as mentioned above, there is no noise like a switching power supply and there is little electromagnetic induction interference, a toroidal transformer. The advantage of is not utilized. (2) Assembly work is troublesome and requires a long time. That is, in the conventional assembling work of a toroidal transformer, there is a work of directly winding a copper wire around an annular toroidal iron core. However, directly winding the copper wire around the annular iron core is difficult and troublesome, and as a result, there is a problem that it takes a long time to complete the toroidal transformer. In particular,
When a circular annular core is used, the copper wire must always be wound along the circumference, so that this assembly work tends to be troublesome and takes a long time. An object of the present invention is to promote downsizing and thinning of a toroidal transformer, and to perform its assembling work simply and quickly.

[0004]

[Means for Solving the Problem] The above-mentioned problem is solved by the annular core 2
Main sheet coil pieces M ₁ , M ₂ ... Wound on the flexible substrate 100 provided along the shape of 00,
Adjacent main sheet coil pieces M ₁ and M ₂ ... Jumper sheet coil pieces J ₁₂ , J ₂₃ for connecting the _two
..First concerning toroidal transformer composed of and
The invention and the flexible substrate 100 on which the main sheet coil pieces M ₁ , M ₂ ... Are formed.
The main sheet coil piece M ₁ which wraps around 0 and is adjacent
And M ₂ ··· for jumper sheet coil pieces J ₁₂ , J ₂₃ ·
・ Connected with ・, exposed parts e _1u and e _2d , e _2u and e _3d
It is solved by a second invention relating to a method of assembling a toroidal transformer for connecting ...

[0005]

[Action]

(1) Therefore, the configuration of the first invention is, as shown in FIGS. 1 to 3, a flexible sheet-shaped flexible substrate 100 provided according to the shape of the annular core 200, and a sheet wound thereon. -Shaped main sheet coil pieces M ₁ and M ₂
... and jumper sheet coil pieces J ₁₂ , J ₂₃ ...
・ By making the toroidal transformer extremely compact, the size and thickness of the toroidal transformer are promoted. (2) In addition, as shown in FIGS. 4 to 12, the configuration of the second invention is a main structure corresponding to the shape of the annular core 200.
The annular core 200 is wrapped with the flexible substrate 100 on which the sheet coil pieces M ₁ , M ₂ ... Are formed.
The joining work of both ends 1021 and 1041, 1022 and 1042 of the flexible substrate 100 on the outer side surface 204, and the jumper sheet coil pieces J ₁₂ , J _23.
By connecting the exposed parts e _1u and e _2d , and e _2u and e _3d , the work contents are simplified and the number of work is greatly reduced, and the toroidal transformer assembly work is performed easily and quickly. It acts as if it were.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings by way of embodiments. The present invention comprises a first invention relating to a toroidal transformer and a second invention relating to a method of assembling a toroidal transformer. The first invention and the second invention will be described in detail below.

A. First Invention (Toroidal Transformer) The first invention is an annular core 200 and a flexible substrate 10.
0, main sheet coil pieces M ₁ , M _2, ... And jumper sheet coil pieces J ₁₂ , J ₂₃ .

A-1 First Embodiment FIG. 1 is a diagram showing a first embodiment of the first invention. The outer shape of the annular core 200 according to the present embodiment is elliptical when viewed from above, and more accurately, two horseshoe-shaped cores including straight and circular portions.
It is a combined land field type (Fig. 4 (A)). In accordance with the shape of the annular core 200, the flexible substrate 1
00, for example, a flex made of polyimide, which is an insulating resin, is provided.

As shown in the figure, the flexible substrate 100 has an area 132 whose inner surface 2 is the inner surface 2 of the annular core 200.
It only touches 02. However, flexible substrate 1
The other regions 111 and 112 of 00 are in contact with the inner side surface 202, and are further extended to the upper surface 206 and the outer side surface 2.
04 and the lower surface 208 and surrounds the annular core 200. Then, for example, the flexible substrate 100
As shown in the figure, both ends 1021 and 1041 are joined to each other on the outer side surface 204 of the annular core 200.

On the flexible substrate 100, two main sheet coil pieces M ₁ and M ₂ are formed with the spacing regions D ₁₂ and D ₂₁ placed therebetween. The main sheet coil pieces M ₁ and M ₂ have the same structure, and for example, the main sheet coil piece M ₁ includes pieces m ₁₁ , m ₁₂ , m ₁₃ ,
It is composed of m ₁₄ , m ₁₅ , m ₁₆ , and m ₁₇ .

These pieces m ₁₁ , m ₁₂ , m ₁₃ , m ₁₄ ,
m _15, among the m _16, m _17, segment m having a terminal t _{17
As shown in FIG. 17} , the exposed portion e _7d of the annular core 200 on the flexible substrate 100 passes through the upper surface 206, the inner side surface 202, and the lower surface 208 of the outer surface 204.
It is connected to the exposed part e _6u of the adjacent piece m ₁₆ .

The piece m ₁₆ adjacent to the piece m ₁₇ extends from the above-mentioned exposed portion e _6u and reaches the upper surface 206 from the outer side surface 204 of the annular core 200 on the flexible substrate 100, immediately before the terminal t ₁₇ . , Turn left toward the drawing, then turn right and extend straight. The straightly extending piece m ₁₆ is arranged on the flexible substrate 100 so as to form an annular core 200.
On the outer surface 204 from the upper surface 206 via the inner surface 202 and the lower surface 208, the other exposed portion e _6d is connected to the exposed portion e _5u of the adjacent piece m ₁₅ .

Hereinafter, in this way, the respective pieces m ₁₁ , m ₁₂ ,
m ₁₃ , m ₁₄ , m ₁₅ , m ₁₆ , and m ₁₇ are sequentially connected and wound on the flexible substrate 100, and finally end at the terminal t ₁₁ at the tip of the element m ₁₁ . This flexible substrate 100
The above winding method is the same for the other main sheet coil piece M ₂ .

The two main sheet coil pieces M ₁ and M ₂ are adjacent to each other, and their terminals t ₁₇ and t ₂₁ are connected by a jumper sheet coil piece J ₁₂ .
Connection is made on the upper surface 206 of the spacing region D ₁₂ . Further, the terminal t ₁₁ of the main sheet coil piece M ₁ and the terminal t ₂₇ of the main sheet coil piece MM ₂ which are provided with the spacing region D ₂₁ therebetween are open, and, for example, the primary winding P Used as a terminal. When the secondary winding S is provided, the flexible substrate 100 on which the main sheet coil pieces M ₁ , M ₂ ... Are formed is multilayered.

A-2 Second Embodiment FIG. 2 is a diagram showing a second embodiment of the first invention. The outer shape of the annular core 200 according to the present embodiment is a square with a chamfer when viewed from above (FIG. 5A). First embodiment (FIG. 1)
Is different from the main sheet coil pieces M ₁ , M ₂ , M
The number of ₃ M ₄ has increased from 2 (Fig. 1) to 4 and adjacent main sheet coil pieces M ₁ and M ₂ , M ₂ and M ₃ ,
The spacing regions D ₁₂ , D ₂₃ , D ₃₄ , and D ₄₁ between M ₃ and M ₄ are fan-shaped instead of arcs (FIG. 1), and jumper sheet coil pieces J ₁₂ , J ₂₃ , and J _34. Is 1 (Fig. 1)
It is the point that it increased from 3 to 3.

How to wrap the flexible substrate 100 in the annular core 200, how to wind the main sheet coil pieces M ₁ , M ₂ ... Formed on the flexible substrate 100, and the terminals t separated by the spacing region D _{41. The fact that 11} and the terminal t ₄₇ are open is similar to that of the first embodiment (FIG. 1), and therefore its explanation is omitted.

A-3 Third Embodiment FIG. 3 is a diagram showing a third embodiment of the first invention. The outer shape of the annular core 200 of the present embodiment is circular when viewed from above (FIG. 6 (A)). The difference from the second embodiment (FIG. 2) is that
The number of main sheet coil pieces M ₁ , M _2, ... Increased from 4 (FIG. 2) to 12, and the number of jumper sheet coil pieces J ₁₂ , J _23. 2) to 11
This is the point that the number has increased.

How to wrap the flexible substrate 100 in the annular core 200, how to wind the main sheet coil pieces M ₁ , M ₂ ... Formed on the flexible substrate 100, and the terminals t separated by the spacing region D _{121. 11} and terminal t ₁₂₇
The fact that is open is the same as that of the second embodiment (FIG. 2), and therefore its explanation is omitted.

B. Second invention (a set of toroidal transformers
Standing method) The second invention relates to a method for assembling a toroidal transformer. The second invention will be described below in the order of the steps. B-1 First Step In the first step, the annular core 200 and predetermined main sheet coil pieces M ₁ and M corresponding to the shape of the annular core 200.
A flexible substrate 100 on which ₂ ... Is formed is prepared.

B-1-a First Embodiment FIG. 4 is a diagram showing a first embodiment in the first step of the second invention. As shown in FIG. 4 (A), the outer shape of the annular core 200 is an ellipse, more precisely, a land field type in which two horseshoe-shaped cores each composed of a linear portion and a circular portion are combined. Also, the flexible substrate 100 is, for example, a flex formed of polyimide, which is an insulating resin, on which a certain pattern is reproduced by using, for example, printing or photo etching as illustrated. Thus, the main sheet coil pieces M ₁ and M ₂ are formed (FIG. 4 (B)). This main sheet coil piece M ₁ ,
The M ₂ is formed by separating the regions 132, 134 and 136, and the regions 134 and 136 will be described later (see FIG. 7).
(A), a region that is cut out before wrapping the annular core 200 with the flexible substrate 100.

However, the area regions 134 and 136 are not cut out before wrapping the annular core 200 with the flexible substrate 100, but the main sheet coil is formed on the flexible substrate 100 in which the area regions 134 and 136 are cut out in advance. It is also possible to form the pieces M ₁ , M _2, ... And prepare such a flexible substrate 100 to assemble the toroidal transformer according to the present invention.

The flexible substrate 100 has a rectangular shape as shown in the drawing, and has central regions 112, 132,
When the width dimension of 111 is substantially equal to the height dimension of the annular core 200 and the annular core 200 is wrapped (see FIG. 7).
(B)), both ends 1021 and 1041, 1022 of the region where the main sheet coil pieces M ₁ and M ₂ are formed
And 1042 face each other so that they can be tightened and joined.

Main sheet coil pieces M ₁ , M ₂ ...
Each is composed of a plurality of pieces. Since the main sheet coil pieces M ₁ and M ₂ have the same elemental pieces, the main sheet coil piece M ₁ will be described as a representative example.

That is, the main sheet coil piece M ₁ comprises a plurality of pieces m ₁₁ , m ₁₂ , m ₁₃ , m ₁₄ , m ₁₅ , m ₁₆ , m _17.
It consists of These pieces m ₁₁ , m ₁₂ , m ₁₃ , m
₁₄ , m ₁₅ , m ₁₆ , and m ₁₇ are arranged in parallel in the lateral direction of the flexible substrate 100, and the front and back are insulated from each other, and the conductor portions are sheet-like and formed of copper foil. Also, the pieces m ₁₁ , m ₁₂ , m ₁₃ , m ₁₄ , m ₁₅ , m ₁₆ ,
m ₁₇ is an exposed part e _1u , e _2u , e _3u , e _4u , e _5u e protruding laterally from one end 1021 of the flexible substrate 100.
_{In addition} to having _{6u, it} also has exposed portions e _2d , e _3d , e _4d , e _5d , e _6d , e _7d protruding laterally from the other end 1041.

The pieces m ₁₁ , m ₁₂ , m ₁₃ , m ₁₄ , m ₁₅ ,
Of the pieces m ₁₆ and m ₁₇ , the element piece m ₁₁ has an exposed portion e _1u extending straight toward the inside of the flexible substrate 100, and a terminal t ₁₁ is provided at the tip portion. Further, the element m ₁₇ also has an exposed portion e similar to the element m _11.
The tip from _7d extends straight toward the inside of the flexible substrate 100, but further extends beyond the central region 111 of the flexible substrate 100 to the inside, and a terminal t ₁₇ is provided at the tip.

However, the straightly extending piece m ₁₁ ,
The pieces m ₁₂ , m ₁₃ , m ₁₄ , m ₁₅ , and m ₁₆ other than m ₁₇ are respectively exposed on one side e _2u , e _3u , as shown in the drawing.
e _4u , e _5u , e _6u to the other exposed portion e _2d , e _3d , e _4d ,
It is displaced by one column toward e _5d and e _6d . That is, the element pieces m ₁₂ , m ₁₃ , m ₁₄ , m ₁₅ , and m ₁₆ are bent in the middle, and the exposed portions of the adjacent element pieces are located on the opposite sides in one row. Therefore, as will be described later, when the flexible substrate 100 wraps the annular iron core 200, the exposed portion e _1u of the element m ₁₁ and the exposed portion e _2d of the element m ₁₂ adjacent thereto face each other. Then (Fig. 10
(A), FIG. 11 (A), FIG. 12 (A)), there is an effect that exposed portions of adjacent element pieces can be easily and quickly connected by soldering or the like (FIG. 10 (B), FIG. 11).
(B), FIG. 12 (B)).

Further, in FIG. 4A, reference numerals M ₁ and M ₂ indicate the flexible substrate 100 and the annular core 20.
Main sheet coil pieces M ₁ and M when 0 is wrapped
Where ₂ is arranged, reference numerals D ₁₂ , D ₂₁ are spacing areas formed between the main sheet coil pieces M ₁ and M _{2 in} the same case, and reference numerals 111, 112, 132 are the same case. In the central regions 111 and 11 of the flexible substrate 100,
The places where the 2 and 132 contact each other are shown.

It should be noted that only the element pieces m ₁₁ , m ₁₂ , m ₁₃ , m ₁₄ , m ₁₅ , m ₁₆ and m ₁₇ constituting the main sheet coil piece M ₁ are shaded. However, this is merely for making the drawings easier to see, and not for distinguishing the element and the element forming the main sheet coil piece M ₂ in terms of configuration and operation.
This is the same in the following drawings, and hatching is given only for convenience of description (FIG. 5, FIG. 6, FIG. 1).
0, FIG. 11, FIG. 12).

B-1-b Second Embodiment FIG. 5 is a view showing a second embodiment in the first step of the second invention. As shown in FIG. 5A, the outer shape of the annular iron core 200 is a square with a chamfer. The flexible substrate 100 has a rectangular shape as in the first embodiment of FIG.
A main sheet coil piece M ₁ formed thereon,
The number of M ₂ ... Is four corresponding to the shape of the annular core 200 of FIG. 5A, and the four main sheet coil pieces M ₁ , M ₂ , M ₃ and M ₄ are It is different from the first embodiment (FIG. 4) in that it is formed without separating the regions.

That is, in FIG. 5B, the four main sheet coil pieces M ₁ , M ₂ , M ₃ and M ₄ have solid line portions C ₁ , C ₂ , C ₃ , C ₄ , C ₅ and C. Proximity through ₆ . Then, the solid line portions C ₁ , C ₂ , C ₃ ,
C ₄ , C ₅ , and C ₆ will be described later (FIG. 8A),
This is a portion that is cut out before the annular core 200 is wrapped in the flexible substrate 100.

However, as described in the first embodiment (FIG. 4), the solid line portions C ₁ , C ₂ , C ₃ , C ₄ , C ₅ , C ₆
Is not cut out before wrapping the annular core 200 with the flexible substrate 100, but the solid line portions C ₁ , C ₂ ,
The main sheet coil pieces M ₁ , M _2, ... Are formed on the flexible substrate 100 in which C ₃ , C ₄ , C ₅ , and C ₆ are cut out, and such a flexible substrate 100 is prepared to apply to the present invention. Such toroidal transformer may be assembled.

In addition, the main sheet coil pieces M ₁ and M
₂ structure and of each segment of ..., the meaning of the reference numerals indicating the relationship between the main sheet coil piece M _1, M _2, ... and the annular core 200 when wrapped the toroid 200 in the flexible substrate 100 Regarding (FIG. 5 (A)), the first line in FIG.
The description is omitted because it is the same as the embodiment.

B-1-c Third Embodiment FIG. 6 is a diagram showing a third embodiment in the first step of the second invention. The outer shape of the annular core 200 is circular, as shown in FIG. The flexible substrate 100 is shown in FIG.
The second embodiment has a rectangular shape, but the number of main sheet coil pieces M ₁ , M _2, ... Formed thereon corresponds to the shape of the annular core 200 of FIG. 6 (A). Then 12
It is different from the second embodiment (FIG. 5) in that it is the number of pieces.

In addition, solid line portions C ₁ , C ₂ ... C
₂₂ is a portion to be cut out before wrapping the annular core 200 with the flexible substrate 100 (see FIG. 9).
(A)), the main sheet coil pieces M ₁ , M _2, ...
Main sheet coil pieces M ₁ and M when 0 is wrapped
The meanings of the reference symbols (FIG. 6 (A)) showing the relationship between ₂ ... And the annular core 200 are the same as those in the second embodiment of FIG.

B-2 Second Step In the second step, the flexible substrate 100 wraps the annular core 200 from the inner side surface 202 toward the outer side surface 204, and at the outer side surface 204, the flexible substrate 1
00 opposite ends 1021 and 1041, 102
2 and 1042 ... are tightened and joined.

B-2-a First Embodiment FIG. 7 is a diagram showing a first embodiment in the second step of the second invention. In this embodiment, the regions 134 and 136 of the flexible substrate 100 are cut out (arrows A and B) as shown in FIG. 7A before the annular core 200 is wrapped with the flexible substrate 100. Thus areas 134 and 136
The flexible circuit board 100, which is cut out at
As shown in FIG. 3, the core is inserted into the annular core 200, and from the inner side surface 202 toward the outer side surface 204, that is, the upper half of the flexible substrate 100 is from the inner side surface 202 to the upper surface 206.
To the outer side surface 204, and the lower half wraps the annular core 200 from the inner side surface 202 to the outer side surface 204 via the lower surface 208.

In this case, both ends 1021 and 1041, 1022 and 1042 of the region where the main sheet coil pieces M ₁ and M ₂ are formed on the flexible substrate 100 face each other (FIG. 7A). Therefore, for example, in FIG.
As shown in (B), both ends 1021 and 1041 are fastened and joined. In addition, when the annular core 200 is wrapped with the flexible substrate 100 in this way,
Spaced areas D ₁₂ , D ₂₁ between the sheet coil pieces M ₁ and M ₂
Are formed (FIGS. 7A and 7B).

B-2-b Second Embodiment FIG. 8 is a diagram showing a second embodiment in the second step of the second invention. In this embodiment, before wrapping the annular core 200 with the flexible substrate 100, as shown in FIG. 8 (A), the solid line portions C ₁ , C ₂ , C of the flexible substrate 100 are used.
Cut out ₃ , C ₄ , C ₅ , C ₆ (Fig. 5 (B)). The flexible substrate 100 thus cut out is put into the annular core 200 as shown by an arrow D, and the inner surface 2
02 from the outer surface 2 via the upper surface 206 or the lower surface 208
The annular core 200 is wrapped toward 04.

In addition, the opposite ends 1021 and 1
041 ... and tightening (Fig. 8)
(B)), a gap region D ₁₂ ... Is formed between the main sheet coil pieces M ₁ and M ₂ (FIG. 7A).
Since FIG. 7B is similar to the first embodiment (FIG. 7), its description is omitted.

B-2-c Third Embodiment FIG. 9 is a diagram showing a third embodiment in the second step of the second invention. In the present embodiment, as in the second embodiment (FIG. 8), before the annular core 200 is wrapped in the flexible board 100, as shown in FIG.
00 solid line portions C ₁ , C ₂ ... C ₂₂ (FIG. 6 (B)) are notched, and the notched flexible substrate 100 is put in the annular core 200 as shown by an arrow E, and The annular core 200 is wrapped from the side surface 202 toward the outer surface 204 via the upper surface 206 or the lower surface 208.

In addition, the opposite ends 1021 and 1
041 ... to be joined by tightening (Fig. 9
(B)), an interval region D ₁₂ ... Is formed between the main sheet coil pieces M ₁ and M ₂ ... (FIG. 9 (A),
Since FIG. 9 (B) is similar to the second embodiment (FIG. 8), its description is omitted.

B-3 Third Step In the third step, adjacent main sheet coil pieces M ₁ , M ₂ ... On the flexible substrate 100 enclosing the annular core 200 are jumper sheet coil pieces J ₁₂ , as well as connected by J ₂₃ ..., and both end portions 1021 and the bonding 1041,1022 and 1042 ...
Exposed parts e _1u and e _2d , e _2u and e _3d ...
Connect.

B-3-a First Embodiment FIG. 10 is a diagram showing a first embodiment in the third step of the second invention. As shown in FIG. 10 (A), the terminals t ₁₇ and t ₂₁ of the adjacent main sheet coil pieces M ₁ and M ₂ are arranged on the flexible substrate 100 enclosing the elliptical annular core 200. It appears on the upper surface 206 side of the iron core 200. Therefore, in the interval region D ₁₂ formed between the adjacent main sheet coil pieces M ₁ and M ₂ ,
The terminals t ₁₇ and t ₂₁ are connected by a jumper sheet coil piece J _{12 as} shown by the diagonal lines.

In the case of connection, a jumper sheet coil piece J ₁₂ is applied to the terminals t ₁₇ and t ₂₁ to crimp the connection portion,
For example, low temperature welding, soldering, or copper plating thereon.

Further, both end portions 1021 and 1041, 1022 and 1 joined at the outer side surface 204 of the annular iron core 200.
The exposed parts e _1u and e _2d protruding from 042 ... _Are connected to each other. In this case, there are a total of 12 connection points, that is, the main sheet coil piece M ₁ has 6 connection points and the main sheet coil piece M ₂ has 6 connection points. When connecting,
Caulking the connection between the exposed parts e _1u and e _2d ...
Low temperature welding, soldering, or copper plating on it.

Further, the terminal terminal t ₁₁ and the terminal terminal t _{27 which} are not mutually connected by the jumper sheet coil piece (FIG. 4 (B)) are left open as terminals of the primary winding P, for example. Further, when the secondary winding S is formed or when the number of turns of the coil is insufficient, the flexible substrate 100 having the main sheet coil pieces M ₁ , M ₂ ... do it.

B-3-b Second Embodiment FIG. 11 is a diagram showing a second embodiment in the third step of the second invention. Is different from the first embodiment (FIG. 10), in view of the number of the main sheet coil piece M _1, M ₂ · · · is increased to four, jumper sheet coil pieces J _12, J
There are 3 places to connect with ₂₃ ..., exposed parts e _1u and e _2d
... the point where the number of connections is increased to 24.

In addition, jumper sheet coil pieces J _{12 of} adjacent main sheet coil pieces M ₁ , M ₂ ...
Connection means by J ₂₃ ... and exposed parts e _1u and e _2d ...
The connecting means are similar to those in the first embodiment, and the description thereof is omitted.

B-3-c Third Example FIG. 12 is a diagram showing a third example in the third step of the second invention. The difference from the second embodiment (FIG. 11) is that in view of the fact that the number of main sheet coil pieces M ₁ , M _2, ... Is increased to 12, jumper sheet coil pieces J ₁₂ ,
_That is, the number of connecting points for J ₂₃ ... has increased to 11 points, and the number of connecting points for the exposed portions e _1u and e _2d ... has increased to 72 points.

In addition, jumper sheet coil pieces J _{12 of} adjacent main sheet coil pieces M ₁ , M ₂ ...
Connection means by J ₂₃ ... and exposed parts e _1u and e _2d ...
Since the connecting means between them is the same as that of the second embodiment, its explanation is omitted.

[0051]

(1) As described above, according to the first invention, the toroidal
Each of the transformers is a sheet-shaped flexible substrate 10.
0, the main sheet coil pieces M ₁ , M _2, ... And the jumper sheet coil pieces J ₁₂ , J _23, ... Make the toroidal transformer compact as a whole. It has a technical effect of promoting the miniaturization and thinning of the. (2) According to the second aspect of the invention, the method of assembling the toroidal transformer is such that the flexible substrate 100 is used to form the annular core 20.
Wrap around 0, both ends 1021 and 1041, 1022
, 1042 ... And the jumper sheet coil pieces J ₁₂ , J ₂₃ ... And the exposed parts e _1u and e _2d , and e _2u and e _3d are connected. In addition to reducing the number of operations, the technical effect that the assembling work of the toroidal transformer can be performed easily and quickly is achieved.

[0052]

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment of the first invention.

FIG. 2 is a diagram showing a second embodiment of the first invention.

FIG. 3 is a diagram showing a third embodiment of the first invention.

FIG. 4 is a diagram showing a first embodiment in a first step of the second invention.

FIG. 5 is a diagram showing a second embodiment in the first step of the second invention.

FIG. 6 is a drawing showing a third embodiment in the first step of the second invention.

FIG. 7 is a diagram showing a first embodiment in a second step of the second invention.

FIG. 8 is a diagram showing a second embodiment in the second step of the second invention.

FIG. 9 is a view showing a third embodiment in the second step of the second invention.

FIG. 10 is a diagram showing a first embodiment in a third step of the second invention.

FIG. 11 is a diagram showing a second embodiment in the third step of the second invention.

FIG. 12 is a diagram showing a third embodiment of the third step of the second invention.

[Explanation of symbols]

100 flexible substrate 200 toroids M _1, M ₂ ··· main sheet coil J _12, J ₂₃ ··· jumper sheet coil D _12, D ₂₃ ··· spacing region

Claims (6)

[Claims] 1. A ring-shaped iron core 200, a flexible substrate 100 provided along the shape of the ring-shaped iron core 200, a ring wound on the ring-shaped flexible substrate 100, and provided with spacing regions D ₁₂ , D _23, ... The main sheet coil pieces M ₁ , M ₂ ... Formed as described above and the adjacent main sheet coil pieces M ₁ , M ₂ ... Are connected to each other, and the above-mentioned spacing regions D ₁₂ , D _23. A toroidal transformer comprising jumper sheet coils J ₁₂ , J _23, ... Formed above. 2. The outer shape of the annular core 200 is elliptical,
The toroidal transformer according to claim 1, wherein the toroidal transformer has a square shape with rounded corners or a circular shape. 3. The toroidal transformer according to claim 1, wherein the flexible substrate 100 is made of an insulating resin. 4. (1) Annular core 200 and annular core 2
Predetermined main sheet coil piece M corresponding to the shape of 00
₁ , M ₂ ... are formed, and the main sheet coil piece M is formed.
₁ , M ₂ ... A plurality of pieces m ₁₁ , m _12, ...
・ Of which, adjacent pieces m ₁₁ and m ₁₂ , m ₁₂ and m ₁₃ ...
Exposed portions e _1u and e _2d , e _2u and e _3d ...
1 and 1041, 1022 and 1042, and the like, the first step of preparing the flexible substrates 100 that are opposed to each other in a row, (2) By the flexible substrates 100,
From the inner side surface 202 to the outer side surface 20 of the annular core 200,
4 toward the outer side surface 204 of the flexible substrate 100 at both ends 1021 and 1041 and 1022.
, 1042 ..., (3) Adjacent main sheet coil pieces M ₁ and M ₂ on the flexible substrate 100 enclosing the annular core 200 are jumper sheet coil pieces J ₁₂ , J ₂₃ ..., and the joined ends 1021 and 1041,
Exposed portions e _1u protruding from 1022 and 1042 ...
And e _2d, third step, toroidal transformer assembly method characterized by consisting of connecting the e _2u and e _3d · · ·. 5. The main sheet coil pieces M ₁ , M formed on the flexible substrate 100 enclosing the annular core 200, wherein the annular core 200 has an elliptical outer shape.
The number of ₂ ... is 2, two end portions 1021 and 1041, 1022 and 1042 of the flexible substrate 100 are joined, one place is connected by the jumper sheet coil piece J ₁₂ , and the exposed portion e _1u. And e _2d , e _2u and e _3d ...
5. The method for assembling the toroidal transformer according to claim 4, wherein there are 12 connection points. 6. The toroidal transformer according to claim 4, wherein a step of cutting out a boundary portion between adjacent main sheet coil pieces M ₁ , M ₂ ... Is added between the first step and the second step. Assembly method.