WO2005031763A1

WO2005031763A1 - Laminated magnetic component and process for producing the same

Info

Publication number: WO2005031763A1
Application number: PCT/JP2003/012429
Authority: WO
Inventors: Yukiharu Suzuki; Toshihiko Kobayashi; Toshimi Mizoguchi
Original assignee: Tamura Corporation
Priority date: 2003-09-29
Filing date: 2003-09-29
Publication date: 2005-04-07
Also published as: AU2003266681A1

Abstract

A laminated transformer (10) comprising a nonmagnetic dielectric sheet (13) having a central through hole (11a) around which a primary winding (12) is formed, a nonmagnetic dielectric sheet (15) laminated on the dielectric sheet (13) and having a central through hole (11b) around which a secondary winding (14) is formed, and magnetic sheets (16, 17) sandwiching the dielectric sheets (13, 15) while touching each other at the circumferential edges and in the through holes (11a, 11b) of the dielectric sheets (13, 15). Since the dielectric sheet (15) is interposed between the primary winding (12) and the secondary winding (14), leakage flux can be suppressed.

Description

Laminated magnetic component and method of manufacturing the same

The present invention relates to a laminated magnetic component in which a coil and a core are formed by laminating sheets having electromagnetic characteristics, and a method for producing the same.

Akira Background technology

In recent years, with the rapid progress of miniaturization of electronic devices, multilayer transformers have attracted attention as light, small and thin multilayer magnetic components. FIG. 6 is an exploded perspective view showing a conventional laminated transformer. FIG. 7 is a vertical sectional view taken along the line VII-VII in FIG. 6 after lamination. Hereinafter, description will be made based on these drawings. The conventional laminated transformer 80 includes a magnetic sheet for primary winding 82b, 82d having primary windings 81a, 81c formed thereon, and secondary windings 81b, 81d. It is provided with magnetic sheets 82c, 82e for the secondary winding on which the d is formed, and magnetic sheets 82a, 82g sandwiching the magnetic sheets 82b to 82e. is there. In addition, a magnetic sheet 82 f for improving magnetic saturation characteristics is interposed between the magnetic sheet 82 e and the magnetic sheet 82 g. The magnetic sheets 82a to 82e are connected to the through holes 90, 91, 92 and the secondary windings 81b, 81d connecting the primary windings 81a, 81c. Through holes 93, 94, 95 are provided. On the lower surface of the magnetic sheet 82a, external electrodes 96 and 97 for the primary winding and external electrodes 98 and 99 for the secondary winding are provided. Magnetic sheets 82 a to 82 g filled with conductors in the through holes 90 to 96 form the core of the laminated transformer 80. Since FIGS. 6 and 7 are schematic diagrams, strictly speaking, the number of turns of the primary windings 81 a and 81 c and the secondary windings 81 b and 81 d ゃ through holes 90 to 9 Position 6 does not correspond between FIG. 6 and FIG.

On the primary side of the laminated transformer 80, the external electrodes 96 → through holes 92 → Primary winding 8 1c → through hole 9 1 → —Next winding 8 1a → through hole 90 → external electrode 97, _! On the other hand, on the secondary side of the laminated transformer 80, the external electrodes 99 → through holes 95 → secondary windings 81 d → throughhornes 94 → secondary windings 81 b → through holes 93 → external electrodes 93 The current flows in the order of 8, and vice versa. The current flowing through the primary windings 81a and 81c generates a magnetic flux 100 (Fig. 7) in the magnetic sheets 82a to 82g. The magnetic flux 100 generates an electromotive force corresponding to the turn ratio in the secondary windings 8 1 b and 8 1 d. Thus, the laminated transformer 80 operates.

Here, the self-inductance of the primary windings 8 1 a and 8 1 c is L 1, the self-inductance of the secondary windings 8 lb and 81 d is L 2, and the primary windings 8 1 a and 8 1 c are the secondary inductances. Assuming that the mutual inductance between the windings 81b and 81d is M, the electromagnetic coupling coefficient k is defined by the following equation.

k-I M I / (L 1L 2) (k≤ 1)

The electromagnetic coupling coefficient k is one of the indicators of transformer performance. The larger the value, the smaller the leakage magnetic flux (leakage inductance), and the higher the power conversion efficiency. In the laminated transformer 80, the portion between the primary windings 81a and 81c and the secondary windings 81b and 81d is a magnetic layer (magnetic sheets 82c to 82e). As a result, a leakage magnetic flux 101 (FIG. 7) was generated, and a sufficient electromagnetic coupling coefficient k could not be obtained. In order to solve this problem, a dielectric layer (not shown) is formed on the primary windings 81a, 81c and on the secondary windings 81b, 81d by screen printing or paste coating. There is a technology (hereinafter referred to as “conventional technology”) for reducing the magnetic permeability of the magnetic layer by using a substance that diffuses from the dielectric layer.

〔task to solve〕

However, this conventional technique has the following problems.

On the dielectric paste applied on the primary windings 81a, 81c and on the secondary windings 81b, 81d, the primary windings 81a, 81c and the secondary windings are placed. 8 1 b, 8 The diffusion of a conductive substance (for example, Ag particles) from Id causes the primary windings 81a, the primary windings 81c, the secondary windings 81b, and the secondary windings 8a. There was a possibility that the insulation between the 1d was reduced. The paste is in a liquid state by, for example, an organic solvent, so that the substance is easily diffused.

Further, even if the leakage magnetic flux is reduced by providing a dielectric layer, the distance between the primary windings 81a and 81c and the secondary windings 81b and 81d is equal to "magnetic layer + dielectric layer". It becomes wider. This means that the leakage magnetic flux easily enters the space, and conversely acts in the direction of decreasing the electromagnetic coupling coefficient k. Therefore, in the conventional technology, it was extremely difficult to increase the electromagnetic coupling coefficient k.o

[Object of the invention]

Accordingly, an object of the present invention is to provide a laminated magnetic sound product capable of increasing the electromagnetic coupling coefficient while maintaining the insulation between the windings. Disclosure of the invention

The laminated magnetic component according to the present invention includes: a dielectric sheet made of a non-magnetic material having a through hole formed in the center; a primary winding positioned on one surface of the dielectric sheet and around the through hole; And a pair of magnets that sandwich the dielectric sheet, the primary winding, and the secondary winding, and that are in contact with each other at the periphery of the dielectric sheet and the through hole for holes. It is equipped with a seat.

Desirably, the dielectric sheet may be a single sheet or a plurality of stacked sheets. Desirably, if the primary winding and the secondary winding face each other across the dielectric sheet, the primary winding and the secondary winding are alternately arranged on one surface of the induction sheet, and The primary windings and the secondary windings may be alternately arranged on the surface. Desirably, when there are a plurality of dielectric sheets, a plurality of primary windings and a plurality of secondary windings can be provided with these dielectric sheets interposed therebetween. At this time, preferably A through-hole for connecting the primary windings and the secondary windings may be provided in the dielectric sheet. Here, the term “non-magnetic material” means a substance having a magnetic permeability at least smaller than that of a magnetic sheet. The term “dielectric sheet” means a sheet having at least a higher resistivity than a magnetic sheet. In a conventional laminated magnetic component also called a dielectric sheet or an insulating sheet, a primary winding and a secondary winding are used. Since a magnetic layer is formed between the wire and the wire, a leakage magnetic flux is generated in the magnetic layer, and the electromagnetic coupling coefficient is reduced. Therefore, in a preferred embodiment of the present invention, a nonmagnetic layer (dielectric sheet) is provided between the primary winding and the secondary winding. Since a core cannot be formed by this alone, a through-hole was provided in the center of the dielectric sheet, and the core was formed by bringing a pair of magnetic sheets into contact with the through hole and the periphery of the dielectric sheet. In the laminated magnetic component of such an embodiment, since the space between the primary winding and the secondary winding is a nonmagnetic layer (dielectric sheet), the leakage magnetic flux can be suppressed. Moreover, unlike the prior art, there is no need to apply a dielectric paste on the primary winding and the secondary winding to form a dielectric layer, so that the insulation between the primary windings and the secondary windings is not required. Is not deteriorated, and the distance between the primary winding and the secondary winding is not widened.

In a preferred embodiment, the magnetic sheet further includes a magnetic frame accommodated in a peripheral edge of the dielectric sheet, and a magnetic core accommodated in a through hole, and the pair of magnetic sheets sandwich the dielectric sheet and form the magnetic frame and the magnetic core. May be in contact with each other through Desirably, the number of dielectric sheets may be one or plural (lamination). Desirably, when there are a plurality of dielectric sheets, a plurality of primary windings and a plurality of secondary windings are provided with these dielectric sheets interposed therebetween. Desirably, at this time, through holes for connecting the primary windings and the secondary windings and the secondary windings may be provided in the dielectric sheet.

In a preferred embodiment, a dielectric sheet is sandwiched between the first magnetic sheet and the second magnetic sheet, and a primary winding and a secondary winding are provided on both surfaces of the dielectric sheet, respectively. Is located. Desirably, the magnetic frame fits around the periphery of the dielectric sheet, and the magnetic core fits in the through hole at the center of the dielectric sheet. Yes. Therefore, the pair of magnetic sheets has few depressions at the periphery and the center of the dielectric sheet. Therefore, since the pair of magnetic sheets does not need to be bent so much, the manufacturing force S is easy. In addition, since the cross-sectional area of the magnetic path can be made sufficient, the magnetic saturation characteristics can be improved. This effect becomes more pronounced as the number of laminated dielectric sheets increases. In particular, if the thickness of the magnetic frame (total for multiple sheets), the thickness of the magnetic core (total for multiple sheets), and the thickness of the dielectric sheet (total for multiple sheets) match, an extremely flat laminated magnetic component Is obtained.

In a preferred embodiment, the magnetic frame and the magnetic core may be formed of a magnetic sheet connected to each other via a support. In this case, the magnetic frame and the magnetic core can be formed at the same time, and the alignment at the time of lamination can be performed simultaneously.

The method for manufacturing a laminated magnetic component according to the present invention is a method for manufacturing the integrated magnetic component according to the present invention. First, a magnetic paste is applied on a substrate, and the paste is dried to form a magnetic sheet. Similarly, a nonmagnetic paste is applied to the substrate, and the paste is dried to form a dielectric sheet. Subsequently, a conductive paste is applied on the dielectric sheet or the magnetic sheet, and the paste is dried to form a primary winding and a secondary winding. Subsequently, the magnetic sheet and the dielectric sheet are peeled off from the substrate, laminated, and pressed to form a laminate. Finally, the laminate is fired.

According to the present invention having the above configuration, a dielectric sheet is provided between the primary winding and the secondary winding, a through hole is provided in the center of the dielectric sheet, and the through hole and the peripheral edge of the dielectric sheet are formed. By forming the core by contacting a pair of magnetic sheets, a laminated magnetic component in which a non-magnetic layer is formed between the first winding and the secondary winding can be realized, thereby suppressing leakage magnetic flux. . Moreover, unlike the prior art, there is no need to apply a dielectric paste on the primary winding and the secondary winding to form a dielectric layer, so that the insulation between the primary windings and the secondary windings is reduced. There is no deterioration, and the distance between the primary winding and the secondary winding does not increase. Therefore, the electromagnetic coupling coefficient can be increased while maintaining the insulation property of the winding phase 5 :. Furthermore, the dielectric sheet intervenes in place of the conventional magnetic The insulation between the primary winding and the secondary winding can also be improved.

In addition to this, the pair of magnetic sheets sandwiching the dielectric sheet are in contact with each other at the periphery of the dielectric sheet and the through hole, so that the magnetic sheet itself acts as a magnetic core and a magnetic frame, so that the number of parts can be reduced.

The magnetic frame is housed in the periphery of the dielectric sheet, the magnetic core is housed in the through hole at the center of the dielectric sheet, and the magnetic sheet is bent at the periphery and the center of the dielectric sheet by sandwiching them with a pair of magnetic sheets. Can be reduced. Therefore, since the magnetic sheet does not need to be bent very much or at all, the production can be facilitated. In addition, since a sufficient cross-sectional area of the magnetic path can be obtained, the magnetic saturation characteristics can be improved.

Since the magnetic frame and the magnetic member are made of a magnetic sheet connected via a support portion, the magnetic frame and the magnetic core can be formed at the same time, and the alignment at the time of lamination can be performed at the same time.

By providing through-holes on the dielectric sheet to connect the primary windings and the secondary windings, respectively, it is easier than connecting the primary windings and the secondary windings with lead pieces. Since these can be connected, manufacturing can be simplified. Brief Description of Drawings

FIG. 1 is an exploded perspective view showing a laminated transformer according to a first embodiment of the present invention, and FIG. 2 is a longitudinal sectional view taken along the line II-II in FIG. 1 after lamination.

FIG. 3 is an exploded perspective view showing a laminated transformer according to a second embodiment of the present invention, and FIG. 4 is a longitudinal sectional view taken along the line IV-IV in FIG. 3 after lamination. FIG. 5 is a process chart showing a method for manufacturing the multilayer transformer of FIG.

FIG. 6 is an exploded perspective view showing a conventional laminated transformer, and FIG. 7 is a longitudinal sectional view taken along the line VII-VII in FIG. 6 after the lamination. Practicing the invention: best modes of rice

Next, a laminated transformer is described as an embodiment of the laminated magnetic component according to the present invention. An example will be specifically described. FIG. 1 is an exploded perspective view showing a multilayer transformer according to a first embodiment (corresponding to claim 1) of the present invention. FIG. 2 is a vertical sectional view taken along the line II-II in FIG. 1 after the lamination. Hereinafter, description will be made based on these drawings.

5 The laminated transformer 10 of the present embodiment has a dielectric for a primary winding made of a non-magnetic material having a through-hole 11a formed in the center and a primary winding 12 formed around the through-hole 11a. For a secondary winding made of a non-magnetic material in which a secondary winding 14 is formed around the through hole lib at the center while being laminated on the sheet 13 and the dielectric sheet 13 and having a through hole lib at the center. And the magnetic sheets 16 and 17 sandwiching the dielectric sheets 103 and 15 and contacting each other at the periphery of the dielectric sheets 13 and 15 and the through holes 11a and 11b. It has. The dielectric sheets 13, 14 and the magnetic sheet 16 have through holes 18, 19 surrounding the primary winding 12, and through holes 20 connecting the secondary winding 14. , 21 are provided. On the lower surface of the magnetic sheet 16, there are provided external electrodes 22, 23 for the primary winding and 锒 and external electrodes 24, 25 for the secondary winding. The through holes 18 to 21 are filled with a conductor. The magnetic sheets 16 and 17 are the core of the laminated transformer 10.

1 and 2 are schematic diagrams. Strictly speaking, the number of turns of the primary winding 12 and the secondary winding 14 and the positions of the through holes 18 to 21 are the same as in FIG. It does not correspond to FIG. In FIG. 2, the film thickness direction (vertical direction) is shown larger than the width direction (horizontal direction).

On the primary side of the laminated transformer 10, external electrodes 22 → through holes 18 →

The current flows in the order of primary winding 1 2 → through hole 1 9 → external electrode 2 3, or vice versa. On the other hand, on the secondary side of the laminated transformer 10, the external electrode 2 45 → The current flows in the order of 0 → secondary winding 1 4 → through hole 2 1 → external electrode 2 5 and / or vice versa, and the current flowing through the primary winding 12 passes through the magnetic sheets 16 and 17 The magnetic flux 26 (FIG. 2) is generated, and the magnetic flux 26 generates an electromotive force corresponding to the turn ratio in the secondary winding 14. In this way, the laminated transformer 10 operates. In the laminated transformer 10, since the space between the primary winding 12 and the secondary winding 14 is a nonmagnetic layer (dielectric sheet 15), the leakage magnetic flux can be suppressed. Also, unlike the prior art, there is no need to apply a dielectric base on the primary winding 12 and the secondary winding 14 to form a dielectric layer. In addition, the insulation between the secondary windings 14 does not deteriorate, and the distance between the primary winding 12 and the secondary winding 14 does not increase. Therefore, the electromagnetic coupling coefficient k can be increased while maintaining the mutual insulation between the windings. In addition, the insulation between the primary winding 12 and the secondary winding 14 is enhanced by the interposition of the dielectric sheet 15 and the force S.

The laminated transformer 10 of the present embodiment is suitable when the number of laminated dielectric sheets 13 and 14 is small. The reason is that if the number of laminated dielectric sheets 13 and 14 is small, the curvature at the bent portion of the magnetic sheets 16 and 17 becomes small, so that the production is easy and the magnetic materials at the center and the periphery are reduced. This is because the thickness of the layer can be obtained sufficiently.

In addition, the dielectric sheet 13 can be omitted by forming the primary winding 12 and the secondary winding 14 on both surfaces of the dielectric sheet 15 respectively. The secondary winding 14 may be formed not on the dielectric sheet 15 but on the magnetic sheet 17. A dielectric sheet may be inserted between the secondary winding 14 and the magnetic sheet 17 to increase the insulation of the secondary winding 12. When a plurality of dielectric sheets are laminated, a magnetic sheet may be interposed at some places. Further, the materials and dimensions of each component, the entire manufacturing method, and the like are in accordance with the second embodiment described later.

FIG. 3 is an exploded perspective view showing a second embodiment (corresponding to claims 2 to 4) of the multilayer transformer according to the present invention. FIG. 4 is a vertical sectional view taken along line IV-IV in FIG. 3 after lamination. Hereinafter, description will be made based on these drawings.

The laminated transformer 30 of the present embodiment has a through hole 31a formed at the center and a primary winding 32a formed around the through hole 31a for a primary winding made of a non-magnetic material. A dielectric sheet 33 and a primary winding made of a non-magnetic material having a through hole 31b formed in the center and a primary winding 32b formed around the through hole 31. Non-magnetic laminated with a dielectric sheet 34 for use and a dielectric sheet 33 with a through hole 35a formed in the center and a secondary winding 36a formed around the through hole 35a A dielectric sheet 37 for a secondary winding composed of a body and a dielectric sheet 34 are laminated and a through-hole 35b is formed in the center, and a secondary winding 36b is formed around the through-hole 35b. An induction sheet 38 for a secondary winding made of a non-magnetic material formed; a magnetic frame 39 a, 39 b that fits around the periphery of the dielectric sheets 33, 34, 37, 38; The magnetic cores 40a, 40b that fit in the through holes 31a, 31, 35a, 35b and the dielectric sheets 33, 34, 37, 38 sandwich the magnetic frame 3. 9a, 39b and magnetic sheets 41, 42 which are in contact with each other via magnetic cores 40a, 40b.

Further, the magnetic frame 39 a and the magnetic core 40 a are connected via four support portions 43 a to form a magnetic sheet 44. The magnetic frame 39 b and the magnetic core 40 b are connected via four support portions 43 b to form a magnetic sheet 45. Between the dielectric sheet 37 and the magnetic sheet 44, an induction sheet 47 for protecting a secondary winding having the same size as the dielectric sheet 37 and having a through hole 46a formed in the center is inserted. Have been. Between the dielectric sheet 38 and the magnetic sheet 45, a dielectric sheet 48 for protecting a secondary winding having the same size as the dielectric sheet 38 and having a through hole 46b formed in the center is inserted. Have been. Here, “winding protection” means to increase the insulation of the winding.

The dielectric sheets 33, 34, 37, 47 and the magnetic sheet 41 are provided with through holes 49, 50, 51 for connecting the primary windings 32a, 32b. The dielectric sheets 33, 34, 37, 38, 47 and the magnetic sheet 41 have through holes 52, 53, 54 connecting the secondary windings 36a, 36b. Is provided. External electrodes 55, 56 for the primary winding and external electrodes 57, 58 for the secondary winding are provided on the lower surface of the magnetic sheet 41. The through holes 49 to 54 are filled with a conductor. The magnetic sheets 41, 42, 44, and 45 are the core of the multilayer transformer 30.

Since FIGS. 3 and 4 are schematic diagrams, strictly speaking, the number of turns of the primary windings 32 a and 32 b and the secondary windings 36 a and 36 b ホール through holes 49 to 5 The position of 4 does not correspond between Fig. 3 and Fig. 4. In FIG. 4, the thickness direction (vertical direction) is shown larger than the width direction (horizontal direction).

The actual dimensions of each component are illustrated. The magnetic sheets 41, 42, 44, and 45 have a thickness of 100 μm, a width of 8 mm, and a depth of 6 mm. The dielectric sheets 33, 34, 37, 38, 47, 48 have a thickness of 33 m, a width of 7 mm, and a depth of 5 mm. Primary winding 3 2 a, 3 2 b and secondary winding

36 a and 36 b have a film thickness of 15 ^ m and a line width of 200 μm. It is practical that about 10 to 50 sheets are laminated.

On the primary side of the multilayer transformer 30, the external electrode 56 → through hole 51 → primary winding 32 a → through hole 50 → primary winding 32 b → through hole

Current flows in the order of 4 9 → external electrode 5 5, and vice versa. On the other hand, on the secondary side of the laminated transformer 30, the external electrode 57 → through hole 54 → secondary winding 36 a → through hole 53 → secondary winding 36 b → through hole 52 → external electrode 5 The current flows in the order of 8, and vice versa. The current flowing through the primary windings 32a and 32b generates a magnetic flux 59 (Fig. 4) in the magnetic sheets 41, 42, 44 and 45. The magnetic flux 59 generates an electromotive force corresponding to the turn ratio in the secondary windings 36a and 36b. Thus, the multilayer transformer 30 operates.

In the laminated transformer 30, the non-magnetic layer (dielectric sheets 34, 37, 38, 47) is provided between the primary windings 32a, 32b and the secondary windings 36a, 36b. ), The leakage magnetic flux can be suppressed. Moreover, unlike the prior art, there is no need to apply a dielectric paste on the primary windings 32a, 32b and the secondary windings 36a, 36b to form a dielectric layer. The insulation of the primary windings 3 2a, the primary windings 3 2b, the secondary windings 36a, and the secondary windings 36b does not deteriorate, and the primary windings 3 2a do not deteriorate. , 32b and the secondary windings 36a, 36b are not widened. Therefore, the electromagnetic coupling coefficient k can be increased while maintaining the insulation between the windings. In addition, the insulation between the primary windings 32a and 32b and the secondary windings 36a and 36b is enhanced by the interposition of the dielectric sheets 37 and 38.

0 W

The laminated transformer 30 of the present embodiment is suitable when the number of laminated dielectric sheets 33,... Is large. Because the magnetic frames 39a, 39b fit in the periphery of the dielectric sheets 33, ..., and the magnetic cores fit in the through holes 31a, ..., even if the number of laminated dielectric sheets 33, ... is large. Since the magnetic sheets 41 and 42 hardly bend when the 40a and 40b are settled, the manufacturing is easy and the thickness of the magnetic material layer at the center and the periphery is sufficiently obtained. Note that the magnetic frame 39 a and the magnetic core 40 a may be separated without being connected by the support portion 43 a. The same applies to the magnetic frame 39 b and the magnetic core 40 b. —The dielectric sheets 47 and 48 may be omitted. Only one of the magnetic sheets 44 and 45 may be provided.

FIG. 5 is a process diagram showing a method of manufacturing the multilayer transformer of FIG. 3 (corresponding to claim 5). Hereinafter, description will be made based on this drawing.

The dielectric sheets (C), (D), (E), (G), (H), and (I) in FIG. 5 are the dielectric sheets 48, 38, 34, 47, 37, and 37 in FIG. 3 Corresponds to 3. The magnetic sheets (A), (B), (F), and (J) in FIG. 5 correspond to the magnetic sheets 42, 45, 44, and 41 in FIG.

First, a magnetic slurry is prepared (Step 61). The magnetic material is, for example, a Ni-Cu-Zn system. Subsequently, a magnetic sheet is formed by placing a magnetic slurry on a PET (polyethylene terephthalate) film using a doctor blade method (step 62). Subsequently, by cutting the magnetic sheet, magnetic sheets (A) and (J) for forming a magnetic flux are obtained (step 63). By punching this magnetic sheet into a predetermined shape, magnetic sheets (B) and (F) for forming a magnetic flux and a magnetic core are obtained (step 64).

Separately, a non-magnetic paste (glass paste) is prepared (Step 64). Subsequently, the dielectric sheets (C), (D), (E), (G), (H), and (I) were created by placing a glass paste on the PET film using screen printing. (Step 66). Subsequently, through holes are formed in the dielectric sheets (D), (E), (G), (H), and (I) by pressing or the like (step 67), and an Ag-based conductive paste is formed. By forming the primary winding and the secondary winding by screen printing,

1 W 200

The through hole is filled with a conductor (step 68).

〔Example〕 . ,

Here, the measurement results of the electrical characteristics of the multilayer transformer according to the present invention and the multilayer transformer according to the prior art will be compared and shown. The configuration of the laminated transformer according to the present embodiment used in the present embodiment and the prior art is as follows.

① Transformer in conventional technology

Primary side 5 turns / layer 1 layer: 5 turns

5 turns on the secondary side 2 layers on the Z layer: 10 turns

Magnetic material; use initial permeability 100

② ー 1 New structure Multilayer transformer 10

Primary side 5 turns / layer 1 layer: 5 turns

Secondary side 5 turns / layer 2 layers: 10 turns

Magnetic material; use initial permeability 100

② ー 2 New structure Multilayer transformer 10

Primary 5 turns Z layer 1: 5 turns

5 turns on the secondary side 2 layers on the Z layer: 10 turns

Magnetic material; use initial magnetic permeability 500

③ ー 1 New structure Multilayer transformer 3 0

5 turns / primary side 3 layers: 15 turns

Secondary side 5 turns / layer 6 layers: 30 turns

Magnetic material; use initial permeability 100

③— 2 New structure Multilayer transformer 3 0

5 turns / primary side 3 layers: 15 turns

Secondary side 5 turns / layer 6 layers: 30 turns

Magnetic material; use initial magnetic permeability 500

Table 1 below shows the results of the electrical characteristic values in ① to ③-2 as described above.

table 1

(Electrical characteristic value) Structure Lp H) Lsiu H) Ιρ H) Is (jUH) K

① 4.25 8.31 1.48 3.02 0.807

② ー 1 5.15 10.86 0.25 0.54 0.975

② ー 2 23.6 48.3 0.33 0.71 0.993

③ ー 1 40.5 82.4 1.05 2.17 0.987

③—2 236.5 485.2 1.42 2.88 0.997

* 1 Withstand voltage characteristics between secondary and secondary ① 3KV or less ② 8 to 10KV ③ 8 to 10KV Next, magnetic sheets (A) and (J) obtained in step 63, magnetic sheets obtained in step 64 ( B), (F), the dielectric sheet (C) obtained in step 66, and the dielectric sheets (D), (E), (G), (H), (I) obtained in step 68 Is peeled off from the PET film and laminated, and these are adhered to each other using a hydrostatic press to form a laminate (Step 69). Subsequently, the laminate is cut into a predetermined size (Step 70). Subsequently, simultaneous firing is performed at around 900 ° C. (Step 71). Finally, a multilayer transformer is completed by forming external electrodes (step 72). It is needless to say that the present invention is not limited to the above embodiment. For example, the number of dielectric sheets, the number of primary windings and the number of secondary windings may be arbitrary. The shape of the primary winding and the secondary winding is not limited to a spiral shape, and a large number of L-shaped ones may be stacked. Industrial applicability

According to the method of manufacturing a laminated magnetic component according to the present invention, a dielectric sheet, a magnetic sheet, a primary winding, and a secondary winding are formed by using a sheet forming technique and a thick film forming technique. Since the wire can be formed, the laminated magnetic component according to the present invention can be produced accurately, inexpensively, and in large quantities. -

Claims

The scope of the claims

1. A dielectric sheet made of a nonmagnetic material having a through hole formed in the center, a primary winding positioned on one surface of the dielectric sheet and around the through hole, and on the other surface of the dielectric sheet A pair of magnetic sheets sandwiching the secondary winding located around the through hole, the dielectric sheet, the primary winding and the secondary winding, and being in contact with each other at the periphery of the dielectric sheet and the through hole; When,

A laminated magnetic component with

2. The magnetic sheet further includes a magnetic frame housed on the periphery of the dielectric sheet, and a magnetic core housed in the through hole, wherein the pair of magnetic sheets sandwich the dielectric sheet and the magnetic frame and the magnetic core Contact each other through

The multilayer magnetic component according to claim 1.

3. The laminated magnetic component according to claim 2, wherein the magnetic frame and the magnetic core are made of magnetic sheets connected to each other via a support.

4. A plurality of the dielectric sheets are laminated, a plurality of the primary windings and a plurality of the secondary windings are provided with the dielectric sheets interposed therebetween, and the primary windings and the secondary windings are connected to each other. A through hole for connection was provided in the dielectric sheet,

The laminated magnetic component according to claim 1.

5. A method for producing a laminated magnetic component according to any one of claims 1 to 4, wherein

A magnetic paste is applied on a substrate, and the paste is dried to form the magnetic sheet. A non-magnetic paste is applied on the substrate, Drying the paste to make the dielectric sheet,

A conductor paste is applied onto the dielectric sheet or the magnetic sheet, and the paste is dried to form the primary winding and the secondary winding. The magnetic sheet and the secondary winding thus obtained are obtained. The dielectric sheet is peeled off from the substrate, laminated, and pressed to form a laminate, and the laminate is fired.

A method for manufacturing a laminated magnetic component.