JP3493857B2 - Multilayer transformer - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated transformer formed by providing a core member on a double-sided board having a winding pattern.

[0002]

2. Description of the Related Art Regarding a laminated transformer according to the prior art,
Description will be given with reference to the drawings shown in FIGS.

In the figure, reference numeral 1 denotes a conventional laminated transformer, which is generally composed of a rectangular multi-layer substrate 2 and a core member 3 provided on the multi-layer substrate 2.

Here, the multi-layer substrate 2 is formed by laminating a plurality of (for example, two) double-sided substrates 6A and 6B, which will be described later, to form a two-layer four-layer substrate (see FIG. 14). As shown in FIG. 12, the multi-layer substrate 2 has a circular main leg insertion hole 2A formed in the center thereof, and five through holes 2B, 2B, ... .

As shown in FIG. 13, the core member 3 has an E-shaped core 4 having an E-shaped cross section and an I-shaped core 5 having an I-shaped cross section.
The main leg 4A inserted into the main leg insertion hole 2A of the multi-layer substrate 2 is formed in the central portion of the E-shaped core 4, and the rectangular support leg is mounted on both sides on both sides in the longitudinal direction of the multi-layer substrate 2. Four
B and 4B are formed.

Reference numerals 6A and 6B denote first and second double-sided boards, and the double-sided boards 6A and 6B are made of insulating resin (for example, glass epoxy material) in a rectangular shape as shown in FIGS. Has been done.

Reference numerals 7A and 7B are primary winding patterns and secondary winding patterns formed on the double-sided boards 6A and 6B.
The secondary winding pattern 7A is the upper main winding pattern 7AU and the lower main winding pattern 7AL formed on the upper and lower surfaces of the first double-sided board 6A, and the secondary winding pattern 7B is the upper surface of the second double-sided board 6B. The upper main winding pattern 7BU formed on The winding patterns 7A and 7B are formed in a ring shape by a conductive thin film (for example, copper foil) having a film thickness of, for example, about 70 μm.

As shown in the plan view of FIG. 15, the first double-sided board 6A has an upper surface winding pattern 7AU for winding the outer circumference of the main landing gear insertion hole 2A in a clockwise direction on the upper surface and a lower surface on the lower surface. Has a lower surface main winding pattern 7AL for winding the outer circumference of the main leg insertion hole 2A clockwise (counterclockwise when viewed from the lower surface). The upper main winding pattern 7AU and the lower main winding pattern 7AL are the inner via hole 6A1.
Are connected in series via the so as to form a primary winding pattern 7A.

On the other hand, the second double-sided board 6B is shown in FIG.
As shown in the plan view of FIG. 7, the upper surface winding pattern 7B is formed by winding the outer circumference of the main landing gear insertion hole 2A clockwise on the upper surface of the double-sided board 6B.
U is formed and configured as the secondary winding pattern 7B.

Further, the double-sided boards 6A and 6B are subjected to punching and cutting after a plurality of double-sided boards are simultaneously molded from one board and laminated to form the multilayer board 2 before the lamination. Therefore, at the stage of forming the winding pattern, the main leg insertion hole 2A and each through hole 2B are not formed.

Reference numeral 8 denotes a thin plate prepreg as an interlayer plate provided between the double-sided substrates 6A and 6B. The prepreg 8 is made of, for example, glass fiber and epoxy resin of about 50-60.
% Impregnated. Then, the prepreg 8 is provided between the double-sided boards 6A and 6B, and the double-sided boards 6A and 6B are laminated by the prepreg 8 by applying heat and pressing. After that, the whole hole processing, plating, outermost layer etching, outer shape processing and the like are performed to form the multilayer substrate 2.

Further, 9A is a resist film formed on the upper surface of the first double-sided substrate 6A which is the outermost layer, and 9B is a resist film formed on the lower surface of the second double-sided substrate 6B. , 9B to insulate the external member.

After the core member 3 is attached to the multilayer substrate 2 in the state shown in FIG. 12, the tape 1 is placed in the longitudinal direction of the core member 3.
By winding 0, the core member 3 is fixed to the multilayer substrate 2.

In the prior art laminated transformer 1 thus constructed, a metal pin (not shown) is provided in each through hole 2B, and the metal pin is connected to the primary winding patterns 7A and 2A.
When a voltage is applied to the primary winding pattern 7A and a current is caused to flow by connecting to each of the next 10 winding patterns 7B, a change in magnetic flux occurs in the core member 3 and the secondary winding pattern 7B.
In B, an induced voltage due to the magnetic field is generated in the direction of canceling the change in the magnetic field.

[0015]

By the way, the primary winding pattern 7A and the secondary winding pattern 7B of the laminated transformer 1 according to the above-mentioned prior art are the main leg insertion holes 2A of the multilayer substrate 2.
Since it is located on the outer periphery of and is formed on the multilayer substrate 2,
There is a problem that the number of turns of the winding patterns 7A and 7B can be wound only as an integer value.

That is, in the laminated transformer 1 according to the prior art, the ratio between the number of turns n1 of the primary winding pattern 7A and the number of turns n2 of the secondary winding pattern 7B is, for example, n1: n.
2 = 2: 1, and if the input voltage is 12V and the required secondary voltage is 9V, then 6V for this laminated transformer 1.
However, it is necessary to separately provide a correction circuit in order to output 9V.

The present invention has been made in view of the above-mentioned problems of the prior art. The present invention provides a winding pattern not only on the outer periphery of the main leg insertion hole of the double-sided board, that is, not only on the outer periphery of the main leg but also on the outer periphery of the supporting leg. It is an object of the present invention to provide a laminated transformer capable of forming not only an integer number of turns but also a number of turns (1 / the number of supporting legs) and optimizing the number of turns of a coil.

[0018]

In order to solve the above-mentioned problems, the invention according to claim 1 provides at least one substrate having a main leg insertion hole formed inside and a support leg insertion groove formed at the outer peripheral edge. And a core member that forms a closed magnetic path by the main leg inserted into the main leg insertion hole of the substrate and a plurality of support legs inserted into the support leg insertion grooves of the outer peripheral edge of the substrate, and 1 formed on the substrate. A secondary winding pattern and a secondary winding pattern in which an induced voltage is generated in proportion to a change in magnetic flux caused by a voltage applied to the primary winding pattern, and the secondary winding pattern is formed in each of the core members. It is formed by including the supporting winding patterns located on the outer periphery of the supporting leg, and connecting the supporting leg insertion groove portion of the substrate of each of the supporting winding patterns with a jumper wire.

As described above, the secondary winding pattern formed on the substrate is formed to include the supporting winding pattern, and the portion of the supporting leg insertion groove of the substrate of each supporting winding pattern is formed by the jumper wire. Thus, for example, when the number of supporting legs is two and the number of turns of the supporting winding pattern is 1, it is possible to form a winding pattern for 0.5 turns, and the supporting winding pattern is a substrate. After attaching the core member to the substrate, the core member can be connected by a jumper wire, and the core member can be firmly fixed to the substrate.

In the invention according to claim 2, at least one substrate having a main leg insertion hole formed inside and a support leg insertion groove formed at the outer peripheral edge, and the substrate is inserted into the main leg insertion hole of the substrate. A core member that forms a closed magnetic circuit by a main leg and a plurality of support legs inserted into support leg insertion grooves on the outer peripheral edge of the substrate; a primary winding pattern formed on the substrate;
A plurality of secondary winding patterns in which an induced voltage is generated in proportion to a magnetic flux change caused by a voltage applied to the secondary winding pattern, and at least one of the plurality of secondary winding patterns is the core member. Is formed by including the supporting winding pattern located on the outer periphery of each supporting leg, and the portion of the supporting leg inserting groove of the substrate in each supporting winding pattern is connected by a jumper wire.

As described above, a plurality of two formed on the substrate.
At least one of the following winding patterns is formed so as to include a supporting winding pattern located on the outer periphery of each supporting leg of the core member positioned outside the substrate, and the supporting leg inserting groove of the substrate of the supporting winding pattern is formed. By forming the parts with jumper wires,
When taking out two or more different induced voltages, for example, if the number of support legs is two and the number of turns of each support winding pattern is 1, a winding pattern of 0.5 turns can be formed. Moreover, the tributary winding pattern can be connected by jumper wires after the core member is attached to the substrate, and the core member can be firmly fixed to the substrate.

In the invention of claim 3, the secondary winding pattern has a number of turns of the supporting winding pattern of n and a number of supporting legs of k.
Then, an induced voltage for n / k turns can be generated.

In the invention of claim 4, the secondary winding pattern is formed so as to include the main winding pattern formed on the substrate at the outer periphery of the main leg insertion hole of the core member. When the number of supporting legs is two, the number of turns of the supporting winding pattern is one, and the number of turns of the main winding pattern is two, a winding pattern for 2.5 turns can be formed.

In the invention of claim 5, the secondary winding pattern is m + n /, where m is the number of turns of the main winding pattern, n is the number of turns of the supporting winding pattern, and k is the number of supporting legs.
An induced voltage for k turns can be generated, and a desired induced voltage can be easily set.

According to the invention of claim 6, the sub-winding pattern of the secondary winding pattern is formed on the outer periphery of each support leg of the core member, and the respective sub-winding patterns are connected in parallel. The magnetic flux generated in each supporting leg can be made uniform.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the accompanying drawings of FIGS. In the embodiments, the same components as those of the above-described conventional technique are designated by the same reference numerals, and the description thereof will be omitted.

First, FIGS. 1 to 5 show a first embodiment of the present invention.
An example of is shown.

In the figure, reference numeral 11 represents a laminated transformer used in this embodiment in place of the laminated transformer 1 according to the prior art,
The laminated transformer 11 includes a multilayer substrate 12 having a rectangular shape,
The multi-layer substrate 12 and the core member 13 are provided.

Here, as shown in FIG. 3, the multi-layer substrate 12 is made up of a plurality of sheets (for example, two sheets) of a first double-sided board 16A and a second double-sided board 16B which will be described later. A multi-layered board of four layers is formed, and a circular main leg insertion hole 12A into which the main leg 14A of the core member 13 is inserted is formed in the central part, and openings are formed on the outside where the support legs 14B and 14B are inserted to the left and right. Rectangular support leg insertion grooves 12B, 12B are formed, and five through holes 12C, 12C, ... Are formed in the front and rear portions, respectively.

As shown in FIG. 2, the core member 13 is composed of an E-shaped core 14 having an E-shaped cross section and an I-shaped core 15 having an I-shaped cross section. The main leg 14A inserted into the main leg insertion hole 12A of the multilayer substrate 12 is
Rectangular support legs 14B, 14B to be inserted into the support leg insertion grooves 12B, 12B of the multilayer substrate 12 are formed on both sides. The core member 13 is fixed to the multilayer substrate 12 by winding the tape 10 in the longitudinal direction of the core member 13.

Reference numerals 16A and 16B denote first and second double-sided boards, and the double-sided boards 16A and 16B are made of insulating resin (for example, glass epoxy material) in a rectangular shape as shown in FIGS. ing.

17A and 17B are double-sided boards 16A and 16B.
The primary winding pattern and the secondary winding pattern formed in FIG.

Here, the primary winding pattern 17A is located on the outer periphery of the main leg insertion hole 12A and is formed on the upper and lower surfaces of the first double-sided board 16A. The upper main winding pattern 17AU and the lower main winding pattern are formed. It is composed of 17 AL.

The secondary winding pattern 17B is located on the outer circumference of the main leg insertion hole 12A and is formed on the upper and lower surfaces of the second double-sided board 16B. The upper main winding pattern 17BU and the lower main winding pattern 17BL are formed. And the left and right support legs 14B, 1
It is composed of left and right tributary winding patterns 17BS, 17BS formed on the upper surface of the double-sided board 16B at the outer periphery of 4B. Also, the tributary winding patterns 17BS, 17B
The middle of S is connected by jumper wires 18, 18 described later.

The winding patterns 17A and 17B are formed of a conductive thin film (for example, copper foil) having a film pressure of, for example, 70 μm.

Reference numerals 18 and 18 denote jumper wires. The jumper wires 18 are located at the openings of the support leg insertion grooves 12B and come into contact with the ends of the support winding patterns 17BS.
7BS1, 17BS1, ... In a state of being electrically connected to the posts 18A, 18A, ... Standing on the multi-layer substrate 12, and among the posts 18A, the posts 18A, 18A facing each other with the support leg insertion groove 12B therebetween. And a lead wire 18B made of an insulating coating wire that is connected by a solder portion H, and the jumper wire 18 is formed so as to straddle the support leg insertion groove 12B. The jumper wires 18 are connected to the middles of the respective subsidiary winding patterns 17BS forming the secondary winding pattern 17B so that the subsidiary winding patterns 17BS cover the outer periphery of the supporting leg 14B of the core member 13. It is wound.

Further, the shape of the support leg insertion groove 12B formed in the multilayer substrate 12 is deep so that the support leg 14B of the core member 13 is located deep inside the support leg insertion groove 12B. Land 17BS1 forming the 18
7BS1, ... Can be positioned at the tip of the support leg insertion groove 12B, and the lands 17BS1 can be arranged in a straight line without being obstructed by the core member 13. Therefore, the lead wire 18B of each jumper wire 18 can be linearly arranged, the clearance between the jumper wire 18 and the core member 13 can be secured, and the insulation strength can be increased.

Reference numeral 19 denotes a thin plate prepreg as an interlayer plate provided between the double-sided boards 16A and 16B. The prepreg 19 is made of glass fiber and epoxy resin of about 5 parts, for example.
It is formed by impregnating 0 to 60%. Then, the prepreg 19 is provided between the double-sided boards 16A and 16B.
Is provided, and the double-sided substrates 16A and 16B are laminated by the prepreg 19 by applying heat and pressing. After that, the multi-layer substrate 12 is formed by performing steps such as hole processing, plating, outermost layer etching, and outer shape processing of the whole.

20A is the double-sided substrate 16 which is the outermost layer.
A resist film formed on the upper surface of A, 20B is a double-sided substrate 1
The resist films formed on the lower surface of 6B are shown respectively, and the resist films 20A and 20B are used to insulate the external members.

Here, based on FIGS. 4 and 5, the first
Primary winding pattern 17A formed on double-sided board 16A
Then, the secondary winding pattern 17B formed on the second double-sided board 16B will be described.

First, as to the primary winding pattern 17A, as shown in FIG. 4, on the upper surface of the substrate 16A, from the through hole 12C which is the starting point a, the main landing gear insertion hole 12B is wound counterclockwise for one turn. Top main winding pattern 17AU
And a lower surface main winding pattern 17AL for winding the main landing gear insertion hole 12A one turn counterclockwise is formed on the lower surface. The upper surface main winding pattern 17AU and the lower surface main winding pattern 17AL have inner via holes 16A.
Series connection via 1 and bottom main winding pattern 17AL
Is connected to the through hole 12C from the bottom surface to the end point b,
A two-turn primary winding pattern 17A is configured.

Next, regarding the secondary winding patterns 17B and 17BS formed on the outer periphery of the support leg insertion grooves 12B and 12B, the secondary winding patterns 17BS and 17BS are shown in FIG. As shown, branching from the starting point c to the left and right, respectively, the left and right support leg insertion grooves 12B
Land 17B that is the end of the pattern located in the opening of
It extends to S1 and is wound around the outer periphery of the support leg 14B through the jumper wire 18 in the counterclockwise direction (direction indicated by the arrow L) for one turn, and returns to the connection point d near the starting point c. At this time, a part of the tributary winding pattern 17BS located on the left side is the inner via hole 16S.
By coming out to the lower surface via 1, the contact between the auxiliary winding patterns 17BS on the upper surface is prevented. Then, at the connection point d, the lower surface portion of the sub winding pattern 17BS located on the left side is returned to the upper surface through the inner via hole 16S2, and the left and right sub winding patterns 17BS and 17BS are connected. As a result, the sub-winding pattern 17 for each turn 17
A parallel circuit is formed by BS and 17BS.

Next, regarding the main winding pattern formed on the outer periphery of the main leg insertion hole 12A of the secondary winding pattern 17B, the main winding pattern is formed on the upper surface, and the outer periphery of the main leg insertion hole 12A is formed. Main winding pattern 17BU that winds one turn clockwise, and the main leg insertion hole 1
2A 1 in the clockwise direction (counterclockwise when viewed from the bottom)
It is composed of a bottom main winding pattern 17BL wound around a turn, and these are connected in series through an inner via hole 16S3. Also, the bottom main winding pattern 17B
L is connected from the lower surface to the through hole 12C which is the end point e. As a result, these upper surface main winding patterns 1
7BU and the lower surface main winding pattern 17BL are connected in series with a parallel circuit of left and right branch winding patterns 17BS, 17BS to form a secondary winding pattern 17B.

The laminated transformer 11 according to this embodiment is constructed in this way, and its operation will be described below.

That is, in the case of this embodiment, the magnetic flux Φ generated by applying a voltage to the primary winding pattern 17A and flowing a primary current causes a magnetic flux change in the core member 13, and this magnetic flux is generated. Φ links the secondary winding pattern 17B, and an induced voltage is generated.

In this embodiment, the upper main winding pattern 17BU and the lower main winding pattern 17BL of the secondary winding pattern 17B are wound around the main leg 14A of the core member 13 by one turn (two turns in total). The magnetic flux interlinking the upper surface main winding pattern 17BU and the lower surface main winding pattern 17BL is 2Φ, and an induced voltage for two turns is generated.
Also, each sub-winding pattern 17 of the secondary winding pattern 17B
BS and 17BS are two supporting legs 14B of the core member 13,
Since 14B is wound one turn at a time, the magnetic flux interlinking the sub-winding patterns 17BS and 17BS of the secondary winding pattern 17B is 1 / 2Φ, and an induced voltage of 0.5 turns is generated. Therefore, in the secondary winding pattern 17B,
An induced voltage of 2.5 turns is generated.

Further, as in the present embodiment, the two support legs 14B, 14B of the core member 13 are wound around the two support legs 14B, 14B one turn each.
Sub winding patterns 17BS, 17 of the next winding pattern 17B
By connecting BS in parallel, support legs 14B, 1
The magnetic flux Φ generated in 4B can be made uniform.

Further, in this embodiment, as shown in the perspective view of FIG. 1, since the jumper wire 18 is used in the middle of the supporting winding pattern 17BS and formed so as to straddle the supporting leg insertion groove 12B, the multilayer substrate 12 is formed. The main leg 14A of the core member 13 and the support leg 14 in the main leg insertion hole 12A and the support leg insertion grooves 12B, 12B of
B and 14B are inserted to firmly fix the E-type core 4 and the I-type core 5 with the tape 10, and then the lead wire 18B is connected to each post 18A by the solder portions H, H ,. To form the sub-winding patterns 17BS, 17
Form BS. As described above, in this embodiment, the core member 13 can be firmly fixed to the multilayer substrate 12 to prevent the core member 13 from being displaced, the induced voltage from changing due to vibration can be prevented, and the secondary voltage can be stabilized and output. can do.

Thus, the laminated transformer 1 according to the present embodiment.
1, the double-sided board 16B constituting the multilayer board 12
The secondary winding pattern 17B formed on the
A upper surface main winding pattern 17BU and lower surface main winding pattern 17BL formed on the outer periphery of A, and left and right support leg insertion grooves 12
Left and right branch winding patterns 17BS, 1 formed on the outer circumference of B
7BS and the branch winding patterns 17BS, 17BS
Since BS is connected in parallel and connected in series to the upper surface main winding pattern 17BU and the lower surface main winding pattern 17BL, for example, the upper surface main winding pattern 17BU and the lower surface main winding pattern 17BL each have a total of 2 turns. When each of the sub-winding patterns 17BS and 17BS has one turn, the number of turns of the secondary winding pattern 17B can be set to 2.5 turns, and the number of turns can be set to an integer and a value below the decimal point. Therefore, the range of the turn number ratio between the primary winding pattern 17A and the secondary winding pattern 17B can be expanded.

As a result, the laminated transformer 11 according to this embodiment can be set to a turn number ratio which cannot be set by the conventional technique, and can be a small and thin transformer in which various turn number ratios can be selected. .

Further, in the case of the laminated transformer 11 according to this embodiment, for example, the input voltage is 12V and the required secondary voltage is 9V.
In the case of V, if the number of turns of the primary winding is set to 2 and the number of turns of the secondary winding is set to 1.5, the secondary voltage of 9 V can be easily obtained without changing the design. Therefore, it is possible to eliminate the correction circuit which is conventionally required.

Further, in the first embodiment, the total number of turns of the secondary winding pattern 17B of the upper main winding pattern 17BU and the lower main winding pattern 17BL is two, and the turns of each sub-winding pattern 17BS are set. The example in which the number of turns is one is illustrated, but the winding method of the secondary winding pattern 17B is spiral, and each of the main winding patterns 17BU and 17B
The total number of turns of L is m turns, and the supporting winding pattern 1
By setting the number of turns of 7BS to be n, the number of turns of the secondary winding pattern 17B can be set to (m + n / 2).

Further, by using the jumper wire 18 in the middle of the support winding pattern 17BS, the support winding pattern 17BS for winding the outer periphery of the support leg 14B can be easily formed after the core member 13 is attached to the multilayer substrate 12. You can
Preventing the positional displacement between the multilayer substrate 12 and the core member 13,
It is possible to eliminate the fluctuation of the output voltage output from the secondary winding pattern 17B.

Further, the lead wire 1 of the jumper wire 18
By using an insulating coated wire for 8B, the lead wire 18
Irrespective of the clearance between B and the supporting leg 14B, the core member 1
It is possible to improve the insulation between the winding wire 3 and the tributary winding pattern 17BS.

Next, the second embodiment is shown in FIGS. 6 to 9, and the feature of this embodiment is that the core member has four supporting legs. In the present embodiment, the above-mentioned first
The same components as those of the embodiment are given the same reference numerals and the description thereof will be omitted.

In the figure, reference numeral 21 denotes a laminated transformer according to the present embodiment, which is roughly composed of a multilayer substrate 22 having a substantially rectangular shape and a core member 23, which will be described later, provided on the multilayer substrate 22. Has been done.

Here, the multi-layer substrate 22 is a multi-layer substrate having four layers by laminating two double-sided substrates 26A and 26B, similarly to the multi-layer substrate 12 according to the first embodiment described above. Has been done.

A circular main leg insertion hole 2 into which the main leg 24A of the core member 23 is inserted is formed in the central portion of the multilayer substrate 22.
2A and four support leg insertion grooves 22 having semicircular bottoms into which support legs 24B, 24B, ...
, B, 22B, ... Are formed, and five through holes 22C, 22C, ... Are drilled in the front and rear respectively.

Further, as shown in FIG. 6, the core member 23 has a table-shaped E-shaped core 24 and an I-shaped cross section.
The main leg 24 is formed of a mold core 25 and is inserted into the main leg insertion hole 22A of the multilayer substrate 22 at the center of the E-shaped core 24.
A has support leg insertion grooves 22B, 22 of the multilayer substrate 22 at the four corners.
Four supporting legs 24B, 24 respectively inserted into B, ...
B, ... Are formed. The core member 23 is fixed to the multilayer substrate 22 by winding the tapes 10 and 10 in the longitudinal direction of the core member 23.

Reference numerals 26A and 26B denote first and second double-sided boards. The multi-layered board 22 is formed by stacking the double-sided boards 26A and 26B, and on the first double-sided board 26A,
The primary winding pattern 27A is provided on the lower surface of the second double-sided board 2
Secondary winding patterns 27B are formed on the upper and lower surfaces of 6B.

The primary winding pattern 27A comprises an upper surface main winding pattern 27AU and a lower surface main winding pattern 27AL formed on the upper and lower surfaces of the first double-sided board 26A,
The secondary winding pattern 27B is on the second double-sided board 26B,
The upper main winding pattern 27BU, the lower main winding pattern 27BL, and the sub winding patterns 27BS, 27 formed on the lower surface.
It consists of BS ,. Then, the branch winding pattern 27B
The middle of S is connected by jumper wires 28, 28, ...

28, 28, ... Show jumper wires, and each of the jumper wires 28 corresponds to a land 27BS1, 27BS1, ... That corresponds to an end portion of each supporting winding pattern 27BS located at the opening of each supporting leg insertion groove 22B. With electrical connection,
Posts 28A, 28A, ... Standing on the multilayer substrate 22.
And a lead wire 28B made of an insulating coating wire for connecting the posts 28A, 28A facing each other across the fulcrum insertion groove 22B among the posts 28A by a solder portion H, and the jumper wire 28 is a fulcrum insertion groove. It is formed so as to straddle 22B. Then, the jumper wires 28 are formed in the respective sub-winding patterns 27B that form the secondary winding pattern 27B.
By connecting the middle of S, the branch winding pattern 27BS is wound so as to cover the outer periphery of the support leg 24B of the core member 23.

Further, the shape of each support leg insertion groove 22B formed in the multilayer substrate 22 is deep so that the support leg 24B of the core member 23 is located deep inside the support leg insertion groove 22B. Land 27BS forming line 28
, 27BS1, ... Can be positioned at the tip of the support leg insertion groove 22B, and the respective lands 27BS1 are arranged in a straight line without being obstructed by the core member 23. Therefore, the lead wire 28B of each jumper wire 28 can be arranged linearly, the clearance between the jumper wire 28 and the core member 23 can be secured, and the insulation strength can be enhanced.

As described above, the multilayer substrate 22 according to this embodiment is composed of the two double-sided substrates 26A and 26B.
Here, the primary winding pattern 27A formed on the first double-sided board 26A and the secondary winding pattern 27B formed on the second double-sided board 26B will be described with reference to FIGS. 8 and 9.

First, regarding the primary winding pattern 27A, as shown in FIG.
An upper surface main winding pattern 27 in which the main leg insertion hole 22A is wound counterclockwise one turn from the through hole 22C which is the starting point A
AU is formed, and a lower surface main winding pattern 27AL for winding the main landing gear insertion hole 22A one turn counterclockwise is formed on the lower surface. Then, the upper surface main winding pattern 27A
U and the lower surface main winding pattern 27AL are connected in series via the inner via hole 26A1, and the lower surface main winding pattern 27AL is the through hole 22 from the lower surface to the end point B.
It is connected to C and forms a two-turn primary winding pattern 27A.

Next, among the secondary winding patterns 27B, 4
Looking at the four support winding patterns 27BS, 27BS, ... Formed on the outer periphery of each support leg 24B, the support winding patterns 27BS, 27BS ,. And further branch at the branch points D and D, respectively, and each branch winding pattern 27BS winds each support leg 24B of the core member 23 one turn in the counterclockwise direction (direction indicated by the arrow L). So that jumper wire 2
8, 28, ... and Inner via holes 26B1, 26B2
And each branch winding pattern 27BS is connected at a connection point E near the starting point C. As a result, four branch winding patterns 27BS, 27BS, which are formed one turn at a time,
... form a parallel circuit.

Next, regarding the main winding pattern formed on the outer periphery of the main leg insertion hole 22A of the secondary winding pattern 27B, the main winding pattern is from the connection point E to the upper surface of the outer periphery of the main leg insertion hole 22A. The upper main winding pattern 27BU formed so as to be wound one turn clockwise (in the direction of arrow R)
And the lower surface main winding pattern 27BL formed so as to wind the outer circumference of the main landing gear insertion hole 22A clockwise (counterclockwise from the lower surface side) one turn, which is substantially through the inner via hole 26B3. Are connected in series. The lower surface main winding pattern 27BL is connected to the through hole 22C from the lower surface to the end point F. This allows
The main winding patterns 27BU and 27BL are connected in series with the parallel circuit of the left and right branch winding patterns 27BS,
The secondary winding pattern 27B is configured.

The present embodiment is constructed in this way, and its operation will be described next.

Also in the case of this embodiment, the magnetic flux Φ generated by applying a voltage to the primary winding pattern 27A and flowing a primary current causes a change in the magnetic flux in the core member 23 as in the first embodiment. This magnetic flux Φ is generated and the secondary winding pattern 2
An induced voltage is generated by interlinking 7B.

At this time, the upper main winding pattern 27BU and the lower main winding pattern 27BL of the secondary winding pattern 27B.
Are wound around the main leg 24A of the core member 23 one turn at a time (two turns in total), and the upper main winding pattern 27B
The magnetic flux linking U and the bottom main winding pattern 27BL is 2Φ
Then, the induced voltage for two turns is generated. In addition, the sub winding patterns 27BS and 27B of the secondary winding pattern 27B.
S are four supporting legs 24B, 24B of the core member 23 ,.
It is wound one turn at a time on the secondary winding pattern 27.
The magnetic flux that links the B sub-winding patterns 27BS, 27BS, ... Is 1 / 4Φ, and an induced voltage of 0.25 turns is generated. Therefore, in the secondary winding pattern 27B, 2.
An induced voltage of 25 turns is generated.

Further, in the present embodiment, the two supporting legs 24B, 24B, ... Of the core member 23 are wound by one turn each.
Sub-winding patterns 27BS, 27 of the next winding pattern 27B
By connecting BS, ... In parallel, the supporting leg 24
The magnetic flux generated in B, 24B, ... Can be made uniform.

Further, as shown in the perspective view of FIG. 6 and the exploded perspective view of FIG. 7, by using the jumper wire 28 in the middle of the support winding pattern 27BS, the main leg insertion hole 22A of the multilayer substrate 22 and each support leg insertion. Main leg 2 of core member 23 in groove 22B
4A and each supporting leg 24B are inserted to firmly fix the E-shaped core 24 and the I-shaped core 25 with the tapes 10 and 10, and then the lead wire 28B is connected to each post 28A by the solder portions H, H ,. The jumper wire 28 is formed to form the sub winding patterns 27BS, 27BS, .... Therefore, the core member 23 is firmly fixed to the multilayer substrate 22 and
It is possible to prevent the displacement of the position, and to prevent the fluctuation of the induced voltage due to the vibration to stably output the secondary voltage.

Thus, in the laminated transformer 21,
The secondary winding pattern 27B formed on the double-sided board 26B constituting the multilayer substrate 22 is formed with the upper main winding pattern 27BU and the lower main winding pattern 27BL formed on the outer periphery of the main leg insertion hole 22A, and four supporting leg insertion grooves. 22B, which is composed of four branch winding patterns 27BS formed on the outer circumference, and the respective branch winding patterns 27BS are connected in parallel to be connected in series to the upper surface main winding pattern 27BU and the lower surface main winding pattern 27BL. For example, when the total number of turns of the upper main winding pattern 27BU and the lower main winding pattern 27BL is 2 and each branch winding pattern 27BS is 1 turn, the number of turns of the double-sided board 26B is 2.25. Yes, you can set the number of turns to an integer and a value below the decimal point.

As a result, the laminated transformer 2 according to this embodiment is obtained.
In No. 1 as well, the turn number ratio of the primary winding pattern and the secondary winding pattern, which cannot be set by the conventional technique, can be set, and various turn number ratios can be selected, and a small and thin transformer. Can be

In each of the above embodiments, the core member having two or four supporting legs is shown as an example, but the present invention is not limited to this, and the number of turns of the main winding pattern is m. ,
The number of turns of the supporting winding pattern is n, and the number of supporting legs is k
In the case of a book, the number of turns by this winding pattern is (m + n / k), and when n = 1, it is 1
A coil with / k turns can be formed. Further, for example, when k = 5 and n is set to 1, 2, 3, and 4, the number of turns set by the branch winding pattern is 1/5.
The number of turns can be set to 2/5, 3/5, and 4/5, and various numbers of turns can be set. In addition, no matter how many k are, it is sufficient to form the total cross-sectional area of the support legs of the core member to be the cross-sectional area of the main leg.

Further, instead of the multilayer substrate 12 (22),
Of course, one double-sided substrate may be used.

Further, in each of the above-described embodiments, by applying a voltage to the primary winding pattern 17A (27A),
Although the laminated transformer in which the induced voltage is generated in the two secondary winding patterns 17B (27B) is illustrated, the present invention is not limited to this, and a plurality of secondary winding patterns in which the induced voltage is generated can be provided. . In this case, at least one of the plurality of secondary winding patterns in which the induced voltage is generated is
The next winding pattern may be formed according to the relationship of (m + n / k).

Furthermore, in each of the above embodiments, the case where the primary winding pattern 17A (27A) and the secondary winding pattern 17B (27B) are formed on the substrate has been described.
The present invention is not limited to this, and the secondary winding pattern 17B (27
Another secondary winding pattern provided separately from B) is provided, and 1
By applying a voltage to the secondary winding pattern 17A (27A), a voltage is induced in the secondary winding pattern 17B (27B) and another secondary winding pattern with respect to the magnetic flux generated in the core member. You may let me. In this case, the other secondary winding pattern can also be called a tertiary winding pattern.

[0079]

As described above in detail, according to the present invention of claim 1, the secondary winding pattern formed on the substrate is wound around the outer circumference of each supporting leg of the core member located outside the substrate. By forming a line pattern and forming a part of the supporting leg insertion groove of the supporting winding pattern with a jumper wire, for example, the number of supporting legs is two and the number of turns of the supporting winding pattern is one. In this case, a winding pattern for 0.5 turns can be formed, and after the core member is attached to the substrate, the branch winding patterns can be connected by jumper wires, so that the core member can be firmly attached to the substrate. Can be fixed to. Further, it is possible to eliminate rattling between the core member and the multilayer substrate, eliminate fluctuations in the output voltage output from the secondary winding pattern, and stabilize the output voltage.

According to the second aspect of the present invention, at least one of the plurality of secondary winding patterns formed on the board is formed on the outer circumference of each of the supporting members of the core member located outside the board. By forming the part of the supporting leg insertion groove of the supporting winding pattern with a jumper wire,
For example, when the number of supporting legs is two and the number of turns of the supporting winding pattern is 1, it is possible to form a winding pattern for 0.5 turns, and after mounting the core member on the substrate, The branch winding patterns can be connected by jumper wires, and the core member can be firmly fixed to the substrate. Then, rattling between the core member and the multilayer substrate can be eliminated, and the output voltage can be stabilized and output.

According to the third aspect of the present invention, when the number of turns of the secondary winding pattern is n and the number of supporting legs is k, the induced voltage for n / k turns is applied to the secondary winding pattern. Can occur.

In the invention of claim 4, the secondary winding pattern is formed so as to include the main winding pattern formed on the substrate at the outer periphery of the main leg insertion hole of the core member.
For example, when the number of supporting legs is two, the number of turns of the supporting winding pattern is 1, and the number of turns of the main winding pattern is 2,
A winding pattern for 2.5 turns can be formed,
An induced voltage of 2.5 turns can be generated in the secondary winding pattern.

In the invention of claim 5, the secondary winding pattern is m + n / k, where m is the number of turns of the main winding pattern, n is the number of turns of the supporting winding pattern, and k is the number of supporting legs.
The induced voltage for the turn can be generated, and the desired induced voltage can be easily set.

According to the sixth aspect of the present invention, the sub winding patterns of the secondary winding pattern are respectively formed on the outer circumferences of the support legs of the core member, and the sub winding patterns are connected in parallel. The magnetic flux generated in each supporting leg can be made uniform.

[Brief description of drawings]

FIG. 1 is a perspective view showing a laminated transformer according to a first embodiment.

FIG. 2 is an exploded perspective view showing a laminated transformer according to the first embodiment.

FIG. 3 is an enlarged vertical cross-sectional view seen from the direction of arrows III-III in FIG.

FIG. 4 is a plan view showing a primary winding pattern formed on a first double-sided board of the laminated transformer according to the first embodiment.

FIG. 5 is a plan view showing a secondary winding pattern formed on a second double-sided board of the laminated transformer according to the first embodiment.

FIG. 6 is a perspective view showing a laminated transformer according to a second embodiment.

FIG. 7 is an exploded perspective view showing a laminated transformer according to a second embodiment.

FIG. 8 is a plan view showing a primary winding pattern formed on a first double-sided board of a laminated transformer according to a second embodiment.

FIG. 9 is a plan view showing a secondary winding pattern formed on a second double-sided board of the laminated transformer according to the second embodiment.

FIG. 10 is a perspective view showing a laminated transformer according to a conventional technique.

FIG. 11 is an exploded perspective view showing a laminated transformer according to a conventional technique.

12 is a transverse cross-sectional view as seen from the direction of arrows XII-XII in FIG.

13 is a vertical cross-sectional view as seen from the direction of arrows XIII-XIII in FIG.

FIG. 14 is an enlarged vertical cross-sectional view of a multilayer substrate showing an enlarged portion (a) in FIG.

FIG. 15 is a plan view showing a primary winding pattern formed on a first double-sided board of a conventional laminated transformer.

FIG. 16 is a plan view showing a secondary winding pattern formed on a second double-sided board of a conventional laminated transformer.

[Explanation of symbols]

11, 21 Multilayer transformer 12, 22 Multilayer substrate 12A, 22A Main leg insertion hole 12B, 22B Support leg insertion groove 13, 23 Core member 14, 24 E type core 14A, 24A Main leg 14B, 24B Support leg 15, 25 I type core 16A , 16B, 26A, 26B Double-sided boards 17A, 27A Primary winding patterns 17B, 27B Secondary winding patterns 17AU, 17BU, 27AU, 27BU Upper main winding patterns 17AL, 17BL, 27AL, 27BL Lower main winding patterns 17BS, 27BS Sub winding pattern 17BS1, 27BS1 Land 18, 28 Jumper wire 18A, 28A Post 18B, 28B Lead wire

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-6-163264 (JP, A) JP-A-6-333759 (JP, A) JP-A-6-224053 (JP, A) JP-A-5- 90028 (JP, A) (58) Fields surveyed (Int.Cl. ⁷ , DB name) H01F 17/00-27/42

Claims (6)

(57) [Claims] 1. At least one substrate having a main leg insertion hole formed therein and a support leg insertion groove formed at an outer peripheral edge thereof, a main leg inserted into the main leg insertion hole of the substrate, and the outside of the substrate. A core member that forms a closed magnetic circuit by a plurality of support legs inserted into the support leg insertion grooves on the periphery, and 1 formed on the substrate.
A secondary winding pattern and a secondary winding pattern in which an induced voltage is generated in proportion to a change in magnetic flux caused by a voltage applied to the primary winding pattern, and the secondary winding pattern is formed in each of the core members. A laminated transformer formed by including a supporting winding pattern located on the outer periphery of a supporting leg, and connecting the supporting leg insertion groove portion of the substrate of each of the supporting winding patterns with a jumper wire. 2. At least one substrate having a main leg insertion hole formed therein and a support leg insertion groove formed at an outer peripheral edge thereof, a main leg inserted into the main leg insertion hole of the substrate, and the outside of the substrate. A core member that forms a closed magnetic circuit by a plurality of support legs inserted into the support leg insertion grooves on the periphery, and 1 formed on the substrate.
A secondary winding pattern and a plurality of secondary winding patterns in which an induced voltage is generated in proportion to a magnetic flux change caused by a voltage applied to the primary winding pattern, and the plurality of secondary winding patterns
At least one of the following winding patterns is formed to include a supporting winding pattern located on the outer periphery of each supporting leg of the core member,
A laminated transformer formed by connecting a portion of a supporting leg insertion groove of the substrate in each of the branch winding patterns with a jumper wire. 3. The secondary winding pattern is n / k, where n is the number of turns of the supporting winding pattern and k is the number of supporting legs.
The laminated transformer according to claim 1 or 2, wherein an induced voltage for a turn is generated. 4. The secondary winding pattern is formed so as to include the main winding pattern formed on the substrate at the outer periphery of the main leg insertion hole of the substrate. The described laminated transformer. 5. In the secondary winding pattern, when the number of turns of the main winding pattern is m, the number of turns of the supporting winding pattern is n, and the number of supporting legs is k, an induced voltage of m + n / k turns is generated. The laminated transformer according to claim 4, wherein 6. The sub-winding pattern of the secondary winding pattern is formed on the outer periphery of each support leg of the core member, and the sub-winding patterns are connected in parallel. ，
The laminated transformer according to 3, 4, or 5.