JPH0864420A - Multilayer chip transformer - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a highly efficient multilayer winding chip transformer with little leakage flux. [Structure] A linear conductive pattern (11, 1) near the edge.
A plurality of magnetic material sheets (10,1)
5, 18) are laminated at relative positions sequentially rotated by 90 ° so that the end of the lower conductive pattern is located at the start of the upper conductive pattern, and the conductive pattern of the lower conductive pattern is formed between two adjacent upper and lower layers. A laminated chip transformer in which a coil of one turn is formed for every four magnetic material sheets by conductively connecting to the start end of the conductive pattern of the upper layer through a through hole formed at the start end of the conductive pattern of the upper layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated chip transformer that can be suitably used in various electronic devices and a method of manufacturing the same.

[0002]

2. Description of the Related Art A laminated chip transformer, particularly a thin card-mounted chip transformer, is often used in various electronic devices.

A first magnetic material laminated portion formed by laminating a plurality of magnetic material sheets on which a conductive pattern is not formed and a second magnetic material formed by laminating a plurality of magnetic material sheets on which a conductive pattern is formed. A multilayer chip transformer has been already proposed in which a body laminated portion and a third magnetic body laminated portion formed by laminating a plurality of magnetic material sheets having no conductive pattern are sequentially laminated. As shown in FIG. 21, the second magnetic body laminated portion in the conventional laminated chip transformer has two sets of conductive patterns for coil conductors in a concentric arrangement of about 3/4 turns, which are substantially equivalent to three sides of a quadrangle. A plurality of magnetic material sheets 60 formed by printing 61 and 62 are prepared, and they are sequentially laminated by 90 ° each at a relative position, and at the same time between the corresponding conductive patterns of two adjacent magnetic material sheets, Conductive connection between the end of the conductive layer of the lower magnetic sheet and the start of the conductive layer of the upper magnetic sheet through a through hole formed in the upper magnetic sheet to form two continuous coils. . In this way, the second magnetic material laminated portion corresponds to one in which the iron core leg and the coil wound around the iron core leg are made as one structure.

The first and third magnetic laminated portions function as upper and lower yokes for guiding the main magnetic flux.

[0005]

The plane size of the laminated chip transformer, that is, the magnetic sheet is about several mm square at most, and the space between the conductive patterns 61 and 62 formed thereon is about several hundred μm at most. However, on the one hand, it not only causes the coil to be short-circuited, but on the other hand, the existence of the space between the conductive patterns itself causes the generation of leakage magnetic flux, which causes a reduction in efficiency.

Therefore, it is an object of the present invention to provide a laminated chip transformer which is free from leakage magnetic flux due to the existence of a gap between coils, and which is free from the risk of short circuit, and a method of manufacturing the same.

[0007]

According to the first aspect of the present invention,
It is composed of a quadrangular first magnetic material sheet laminated body having a coil and a quadrangular second magnetic material sheet laminated body arranged above and below the coil. The first magnetic material sheet laminated body has two opposite sides. A plurality of linear conductive patterns for the first coil and second conductive patterns for the second coil which are parallel to each other in the vicinity of the edge of It is composed of one magnetic sheet, and these magnetic sheets are laminated by sequentially shifting the relative position by 90 ° so that the end of one conductive pattern of the adjacent magnetic sheet and the start of the other conductive pattern face each other. , A through hole in which the end of one conductive pattern and the start of the other conductive pattern of the adjacent magnetic material sheets are formed at the start of the other conductive pattern for each coil And it is characterized in that it constitutes two sets of coils of one turn every four magnetic sheets by connecting conductive via.

According to a second aspect of the present invention, the first magnetic material sheet laminated body is provided with two coils for adjusting the number of turns of two sets of coils.
A linear single conductive pattern formed near one edge is formed on at least one of the lower layer and the upper layer of the magnetic material sheet on which the conductive pattern of the book is formed, and the through end is formed at the beginning of the conductive pattern. It is characterized by further comprising at least one magnetic material sheet having holes formed therein.

According to a third aspect of the present invention, there is provided a hexagonal first magnetic material sheet laminated body having a coil and a hexagonal second magnetic material sheet laminated body disposed above and below the coil.
The magnetic sheet laminated body of 3 forms three linear conductive patterns which are close to the edges of every other three sides and are parallel to the edges, and each of the conductive patterns has a through hole at the start position. Composed of a plurality of magnetic material sheets formed with the magnetic material sheets, and the magnetic material sheets are sequentially positioned at 60 ° relative positions so that the end of one conductive pattern of the adjacent magnetic material sheet and the start end of the other conductive pattern face each other. Through holes formed by staggering and stacking, and for each coil of each magnetic sheet, the end of one conductive pattern and the start of the other conductive pattern of the adjacent magnetic sheet are formed at the start of the other conductive pattern. 6 by conductively connecting via
It is characterized in that three sets of coils each having one turn are formed for each magnetic sheet.

According to a fourth aspect of the present invention, in the first magnetic material sheet laminate, at least one of the lower layer and the upper layer of the magnetic material sheet on which three conductive patterns are formed is provided with every other two layers.
A magnetic sheet of a second pattern in which two linear conductive patterns are formed in the vicinity of the edges of the sides and are parallel to the edges, respectively, and a through hole is formed at the beginning of the conductive pattern; At least one of a magnetic sheet of the third pattern in which a linear conductive pattern which is close to the edge of the conductive pattern and which is parallel to the edge is formed and a through hole is formed at the starting end of the conductive pattern It is characterized by being additionally provided.

According to a fifth aspect of the present invention, there is provided a quadrangular first magnetic sheet laminate having a coil and a quadrangular second magnetic sheet laminate arranged above and below the first magnetic sheet laminate.
The magnetic sheet laminated body of No. 1 runs parallel to it along the first side to the fourth side, starting from the central part near the edge of the first side, and the central part near the edge of the fourth side. It is composed of a plurality of magnetic material sheets on which a conductive pattern of 3/4 turns is formed as an end, and these magnetic material sheets are formed between the start end and the edge of each conductive pattern and conductively connected to the start end. First through hole and 90 ° from it
A magnetic sheet of the first pattern having a second through hole that is formed so as to be insulated from the conductive pattern at a position corresponding to the rotated second side, and the first through hole and the third side rotated 180 ° from the first through hole. And a magnetic sheet of a second pattern having a third through hole formed at a corresponding position of the conductive pattern so as to be insulated from the conductive pattern, and the magnetic sheets of these two patterns are alternately and sequentially arranged at 90 ° relative positions. Magnetic sheets in which the end of one conductive pattern and the start end of the other conductive pattern of every other magnetic material sheet are interposed in the through hole formed in the start end of the other conductive pattern and in the middle. By conducting conductive connection to each other through through holes formed at the corresponding positions of the two magnetic sheets, the conductive patterns of every other magnetic sheet can be conveniently connected to each other. It is characterized by the construction of the file.

According to a sixth aspect of the present invention, the first magnetic sheet laminate has only the first through hole in at least one of the lowermost layer and the uppermost layer for adjusting the number of turns of the two sets of coils. It is characterized by further comprising at least one magnetic pattern sheet having the third pattern.

According to a seventh aspect of the present invention, there is provided a quadrangular first magnetic sheet laminated body having a coil and a quadrangular second magnetic sheet laminated body arranged above and below the coil.
The magnetic sheet laminated body of No. 1 runs parallel to it along the first side to the fourth side, starting from the central part near the edge of the first side, and the central part near the edge of the fourth side. A first through hole which is formed between the start end and the edge of each conductive pattern and is conductively connected to the start end while forming a 3/4 turn conductive pattern which terminates, 90 ° from there
A second through hole formed at a corresponding position on the rotated second side so as to be insulated from the conductive pattern and a second through hole formed at a corresponding position on the third side further rotated by 90 ° from the conductive pattern so as to be insulated from the conductive pattern. The magnetic sheets of the first pattern having the third through holes are sequentially laminated by shifting the relative position by 90 °, and the end of one conductive pattern and the start of the other conductive pattern of every other magnetic sheet are stacked. Is electrically conductively connected to each other through a through hole formed at the start end of the other conductive pattern and a through hole formed at a corresponding position of the two magnetic material sheets interposed in the middle of the other conductive pattern. The present invention is characterized in that the conductive patterns of the magnetic material sheet form a continuous three sets of coils for convenience.

According to an eighth aspect of the present invention, the first magnetic sheet laminate has a first through hole and a first through hole in at least one of the lowermost layer and the uppermost layer for adjusting the number of turns of the three sets of coils. Second pattern magnetic sheet having only three through holes, third pattern magnetic sheet having only first through holes and second through holes, and fourth pattern having only first through holes At least one kind of magnetic sheet among the above magnetic sheets is additionally provided.

[0015]

In the invention described in claims 1 and 2, 4
Two sets of coils with one turn are formed for each magnetic sheet, and both coils overlap at the same position when viewed from the axial direction, but they must be spatially separated and insulated from each other. become. Screen printing is easy, and the gap between both coils when viewed in the axial direction is zero. Therefore, the leakage magnetic flux between both coils can be zero, and the efficiency as a transformer can be improved.

According to the third and fourth aspects of the invention, basically, three sets of coils each having one turn are formed for every six magnetic sheets, and the three sets of coils are located at the same position when viewed from the axial direction. They overlap but exist spatially apart. With this, the same operation as the inventions of claims 1 and 2
It is possible to exert an effect.

According to the fifth and sixth aspects of the invention, two sets of coils are formed by conductively connecting every other magnetic sheet of 3/4 turn having the same conductive pattern through through holes. According to this, claim 1,
The same actions and effects as those of the second aspect of the invention can be achieved.

In the inventions described in claims 7 and 8, the same conductive pattern is the same as that of claims 5 and 6, but by opening the through holes differently, every two magnetic sheets are formed. Three sets of coils are formed by conductively connecting through the through holes. Also by this, the same operations and effects as the inventions of claims 1 and 2 can be achieved.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of a laminated chip transformer according to the present invention. The feature of the multilayer chip transformer 2 is that two sets of coils are formed so as to overlap each other at the same position when viewed in the axial direction.

FIGS. 2, 3 and 4 respectively show a magnetic sheet 10 with a conductive pattern for two coils, a magnetic sheet 15 with a conductive pattern for a coil, which are prepared for making the chip transformer 2 of FIG. 3A and 3B show the magnetic sheet 18 without a conductive pattern. Magnetic sheet 1
0 and 15 are prepared by the number corresponding to the number of coil turns. The magnetic sheets 10, 15 and 18 are made of Ni-Zn ferrite. The magnetic sheet 10 (FIG. 2) has two conductive patterns 11, 1 parallel to each other on opposite sides.
3, and one conductive pattern 16 is formed on one side of the magnetic sheet 15 (FIG. 3) by screen printing. Through holes 12, 1 are formed at the start ends (start ends as coils) of the conductive patterns 11, 13, 16 respectively.
4 to 17 are formed. The magnetic sheet 18 (FIG. 4) is located above and below the coil and is used to form a yoke for guiding the magnetic flux.

As shown in FIG. 1, first, a required number of magnetic material sheets 18 having no conductive pattern forming the lower yoke are laminated to form a first layer S1. Although only one sheet is conceptually shown in the drawing, in actuality, the sheets are laminated so that the required magnetic path cross-sectional area is obtained. First layer S
The second layer S composed of the magnetic sheet 10 on the first layer S
The second to tenth S10 are sequentially stacked in a relative position rotated by 60 ° in the clockwise direction. Stacked. Second
In the layer S2, terminal electrodes T11 and T21 extending from the conductive patterns 11 and 13 formed on the magnetic sheet 10 to the edges of the sheet are additionally formed at the respective starting ends.

Between the second layer S2 and the third layer S3, the layer S
The terminal ends of the second conductive patterns 11 and 13 are provided at the start ends of the conductive patterns 11 and 13 of the layer S3 and the through holes 1 provided at the start ends of the conductive patterns 11 and 13 of the layer S3, respectively.
Conductive connection is provided through the electrodes 2 and 14. Similarly, between the third layer S3 and the fourth layer S4, the ends of the conductive patterns 11 and 13 of the layer S3 are located at the start ends of the conductive patterns 11 and 13 of the layer S4 and the start ends of the conductive patterns 11 and 13 of the layer S4. Conductive connection is provided through the through holes 12 and 14 provided. Thereafter, in the same manner, the lamination and connection of the tenth layer S10 are sequentially performed. A terminal electrode T22 extending from the end of the conductive pattern 13 of the tenth layer S10 to the edge of the sheet is additionally formed. Thus, the conductive pattern 13 of the nine magnetic sheets from the terminal electrode T21 of the second layer S2 to the terminal electrode T22 of the tenth layer S10.
Will form a continuous 9/4 turn coil.

The eleventh layer S11 and the twelfth layer S12, which are disposed on the tenth layer S10, are the conductive patterns 1 respectively.
6 is formed of a magnetic material sheet 15. In these magnetic material sheets 15, the conductive patterns 16 are arranged in a clockwise direction with respect to the corresponding conductive patterns of the magnetic material sheet immediately below.
It is laminated so as to take a relative position rotated by 0 °. The end of the conductive pattern 11 of the layer S10 is at the beginning of the conductive pattern 16 of the layer S11, and the end of the conductive pattern 1 of the layer S11 is
Conductive connection is made through a through-hole 17 provided at the start end of 6. The end of the conductive pattern 16 of the layer S11 is conductively connected to the start of the conductive pattern 16 of the layer S12 through a through hole 17 provided at the start of the conductive pattern 16 of the layer S12. A terminal electrode T12 extending from the end of the conductive pattern 16 of the twelfth layer S12 to the edge of the sheet is additionally formed. Thus, the second
Conductive pattern 11 of 11 magnetic sheets from the terminal electrode T11 of the layer S2 to the terminal electrode T12 of the twelfth layer S12
And 16 will form an 11/4 turn coil.

A thirteenth layer S13 is formed on the twelfth layer S12 by laminating a required number of magnetic material sheets 18 having no conductive pattern forming the upper yoke. The number of laminated magnetic sheets 18 in the thirteenth layer S13 is also determined based on the same idea as in the case of the first layer S1.

As described above, the laminated chip transformer 2
Is configured. This chip transformer 2 has a terminal electrode T
One set of coils between 11 and T12, and the terminal electrode T2
Another pair of coils is formed between 1 and T22, and two pairs of coils are overlapped at the same position when viewed from the axial direction, but they are spatially separated and exist in an insulated form. As can be seen from the above description, the magnetic material sheet having the conductive pattern is prepared according to the required number of coil turns.

According to the embodiment shown in FIG. 1, since two sets of coils are present in the form of overlapping at the same position when viewed in the axial direction, the gap between both coils when viewed in the axial direction is zero, and therefore, The leakage magnetic flux between both coils can be made zero, and the efficiency as a transformer can be improved. Further, the two conductive patterns forming the two sets of coils are separated by a maximum distance as shown in FIG. 2, so that not only the distributed capacitance between the coils becomes small, but also it is necessary to worry about the short circuit between the coils. However, there is an advantage that the conductive pattern can be printed easily. The type of conductive pattern is basically 2
Since it is sufficient to prepare several magnetic sheets 10 and 15 shown in FIG. 2 or FIG. 3 according to the number of coil turns required, the manufacturing cost can be reduced.

FIG. 5 shows a second embodiment of the multilayer chip transformer according to the present invention. The laminated chip transformer 20 according to this embodiment is characterized in that four sets of regular hexagonal magnetic sheets (see FIGS. 6 to 9) are used and three sets of coils are superposed at the same position when viewed in the axial direction. To be formed.

The magnetic sheet 21 shown in FIG. 6 is provided with three conductive patterns 22, 23 and 24 so as to be located near every other three sides of the hexagon, and the magnetic sheet 25 shown in FIG.
2 should be located near every other side of the hexagon
The conductive patterns 26 and 27 are formed, and one conductive pattern 29 is formed on the magnetic sheet 28 of FIG. 8 so as to be located near any one side of the hexagon. Through holes H are formed at the end portions that form the starting ends of the conductive patterns of the magnetic sheets 21, 25 and 28, respectively. These magnetic sheets are used to form the coil body. A conductive pattern is not formed on the magnetic sheet 30 of FIG. 9, and the magnetic sheet 30 is arranged above and below the coil and is used to form a yoke.

As shown in FIG. 5, first, a necessary number of magnetic material sheets 30 having no conductive pattern forming the lower yoke are laminated to form a first layer S1. Although only one sheet is conceptually shown here, the number of sheets is actually laminated so that the required magnetic path cross-sectional area can be obtained. The second layer S2 is stacked on the first layer S1. The second layer S2 is based on the magnetic sheet 28 and additionally has a terminal electrode T11 extending from the conductive pattern 29 formed thereon to the edge of the sheet.

A third layer S3 is laminated on the second layer S2. The magnetic sheet 28 of the third layer S3 has a conductive pattern 29.
Are arranged at a relative position rotated by 60 ° clockwise with respect to the conductive pattern 29 on the magnetic sheet of the second layer S2. Between the two layers S2 and S3, the end of the former conductive pattern 29 and the start of the latter conductive pattern 29 are conductively connected via a through hole H formed at the start end of the latter conductive pattern.

A fourth layer S4 is laminated on the third layer S3. The magnetic sheet 25 is arranged on the fourth layer S4. The magnetic sheet 25 of the fourth layer S4 has the third conductive pattern 27.
It is arranged so as to have a relative position rotated by 60 ° clockwise with respect to the conductive pattern 29 on the magnetic sheet of the layer S3. A terminal electrode T21 extending from the leading end of the conductive pattern 26 of the fourth layer to the edge of the sheet is additionally formed. The former conductive pattern 2 is formed between both layers S3 and S4.
The terminal end of 9 and the starting end of the latter conductive pattern 27 are conductively connected via a through hole H formed at the starting end of the latter conductive pattern.

A fifth layer S5 is laminated on the fourth layer S4. The magnetic sheet 25 is arranged on the fifth layer S5. In the magnetic sheet 25 of the fifth layer S4, the conductive pattern 27 is the fourth
It is arranged so as to take a relative position rotated by 60 ° in the clockwise direction with respect to the conductive pattern 27 on the magnetic sheet of the layer S4. Between both layers S4 and S5, the end of the former conductive pattern 26 and the start of the latter conductive pattern 26 are conductively connected through a through hole H formed at the start end of the latter conductive pattern, and the former The end of the conductive pattern 27 and the start of the latter conductive pattern 27 are conductively connected to each other through a through hole H formed at the start end of the latter conductive pattern.

Below, on the fifth layer S4, the sixth layer S6 ...
The magnetic sheet 21 is arranged as the eleventh layer S11, the magnetic sheet 25 is arranged in the twelfth layer S12 to the thirteenth layer S13, and the magnetic sheet 28 is arranged in the fourteenth layer S14 to the fifteenth layer S15. A plurality of magnetic material sheets 30 are arranged in the uppermost 16th layer S16. A terminal electrode T31 is additionally formed at the beginning of the conductive pattern 24 of the sixth layer S6, a terminal electrode T32 is additionally formed at the end of the conductive pattern 24 of the eleventh layer S11, and the conductive pattern 26 of the thirteenth layer S13 is formed. The terminal electrode T22 is additionally formed at the terminal end of the, and the terminal electrode T12 is additionally formed at the terminal end of the conductive pattern 28 of the fifteenth layer S15.

Terminal electrodes T11 and T12 are formed by sequentially conductively connecting the conductive patterns of the respective layers as shown in the figure.
A coil of about 14/6 turns is formed between the terminal electrodes T
A multilayer chip transformer 20 in which a coil of about 10/6 turns is formed between 21 and T22 and a coil of about 6/6 turns is formed between the terminal electrodes T31 and T32 can be configured. The type and number of magnetic sheets to be used may be determined according to the required number of coil turns. These three sets of coils overlap each other at the same position when viewed in the axial direction of the transformer 20, but are spatially separated and exist in an insulated form.

According to the embodiment shown in FIG. 5, since three sets of coils are present in the same position as viewed from the axial direction, the gaps between the coils when viewed in the axial direction are zero, and therefore, As in the case of the embodiment of FIG. 1, the efficiency of the transformer can be improved by reducing the leakage flux between the coils to zero. In addition, this transformer 20 3
The coils can be used one as an input winding and the other two as an output winding.

FIG. 10 shows a third embodiment of the multilayer chip transformer according to the present invention. As shown in FIGS. 11 to 13, the laminated chip transformer 40 according to this embodiment is characterized in that all conductive patterns have the same shape, but only three through holes are different in the shape of a rectangular magnetic sheet 41 ( 11), 43 (FIG. 12) and 45
(FIG. 13) is used to form two coils. The transformer 40 actually uses a yoke magnetic material sheet 47 (FIG. 14) without a conductive pattern.

The magnetic material sheets 41, 43, 45 have conductive patterns 42, 4 of about 3/4 turn from the center near the first side (arbitrary reference side) to the center near the fourth side.
4, 46 are formed. Both ends of each conductive pattern extend to the middle of the sheet edge, and the connecting portions 42s, 42s
e; 44s, 44e; 46s, 46e are formed. The suffix s indicates the starting end connection part, and the suffix e indicates the ending end connection part. Furthermore, the magnetic sheet 4
In FIG. 1, through holes H1 and H2 are formed at the ends of the starting end connecting portions 42s of the conductive pattern 42 and at 90 ° rotation positions (second sides) corresponding thereto, respectively. Through holes H1 and H3 are formed in the magnetic material sheet 43 at the end of the starting end connecting portion 44s of the conductive pattern 44 and at the 180 ° rotation position (third side) corresponding thereto, respectively. The magnetic sheet 45 has a conductive pattern 46 having a starting end connecting portion 46s.
Through hole H1 is formed only at the end portion of.

As shown in FIG. 10, first, a required number of magnetic material sheets 47 having no conductive pattern forming the lower yoke are laminated to form a first layer S1. Again, only one sheet is conceptually shown. The second layer S2 made of the magnetic sheet 45 is laminated on the first layer S1.
A terminal electrode T11 extending from the connection portion (46s) of the conductive pattern 46 of the magnetic sheet 45 of the second layer S2 to the edge of the sheet is formed.

A third layer S3 made of a magnetic sheet 45 is laminated on the second layer S2. The magnetic sheet 45 of the third layer S3 is arranged at a relative position rotated 90 ° counterclockwise with respect to the magnetic sheet 45 of the second layer S2.
Between the two layers S2 and S3, the former terminal connection portion (46e) of the conductive pattern 46 and the latter terminal connection portion (46s) of the latter conductive pattern 46 are the conductive pattern starting terminal connection portion (46s) of the latter magnetic material sheet. Conductive connection is made through a through hole H1 formed in the.

A fourth layer S4 made of a magnetic material sheet 43 is laminated on the third layer S3. In the magnetic sheet 43 of the fourth layer S4, the through hole H1 has the magnetic sheet 4 of the second layer S2.
The through hole H1 is located at the same position. Conductive pattern 44 of magnetic sheet 43 of fourth layer S4
A terminal electrode T21 extending from there to the edge of the sheet is formed at the starting end connecting portion (44s). There is no electrical interconnection between the third layer S3 and the fourth layer S4.

A fifth layer S5 made of the magnetic material sheet 41 is laminated on the fourth layer S4. The magnetic sheet 41 of the fifth layer S5 is arranged at a relative position such that the through hole H1 is located at the same position as the through hole H3 of the magnetic sheet 43 of the fourth layer S4. Conductive pattern 42 of fifth layer S5
Of the fifth layer S3 and the end connection of the third layer S3
Conductive connection is made through the through hole H1 of No. 5 and the through hole H3 of the fourth layer S4.

A sixth layer S6 made of a magnetic material sheet 43 is laminated on the fifth layer S5. The magnetic sheet 43 of the sixth layer S6 is arranged at a relative position such that the through hole H1 is located at the same position as the through hole H2 of the fifth layer S5. The beginning connection portion of the sixth layer S6 and the termination connection portion of the fourth layer S4 are the through hole H1 and the fifth layer S5 of the sixth layer S6.
Conductive connection is made through the through hole H2.

A seventh layer S7 made of a magnetic material sheet 41 is laminated on the sixth layer S6. The magnetic sheet 41 of the seventh layer S7 is arranged at a relative position such that the through hole H1 is located at the same position as the through hole H3 of the sixth layer S6. The beginning connection portion of the seventh layer S7 and the termination connection portion of the fifth layer S5 are the through hole H1 of the seventh layer S7 and the sixth layer S6.
Conductive connection is made through the through hole H3.

Similarly, on the seventh layer S7, the eighth layer S8 made of the magnetic sheet 43, the ninth layer S9 made of the magnetic sheet 41, and the tenth layer S1 made of the magnetic sheet 43 are formed on the seventh layer S7.
0, an eleventh layer S11 composed of the magnetic material sheet 45, a twelfth layer S12 composed of the magnetic material sheet 45, and a thirteenth layer S13 composed of the magnetic material sheet 47 are sequentially laminated to form an eighth layer S8 and a sixth layer S6. Interconnection between the ninth layer S9 and the seventh layer
Interconnect between layers S7, 10th layer S10 and 8th layer S8
And the eleventh layer S11 and the ninth layer S9, and further the twelfth layer S12 and the eleventh layer S11. A terminal electrode T22 extending from the terminal connection portion (44e) of the conductive pattern 44 of the tenth layer S10 to the edge of the sheet is formed.
A terminal electrode T12 extending from the terminal connection portion (46e) of the conductive pattern 46 of the layer S12 to the edge of the sheet is formed.

Thus, according to the embodiment of FIG. 10, a laminated chip having a 21/4 turn coil formed between the terminal electrodes T11 and T12 and a 12/4 turn coil formed between the terminal electrodes T21 and T22. The transformer 40 can be configured. The type and number of magnetic sheets to be specifically used are determined according to the required number of coil turns. These two pairs of coils are transformer 40
Seen from the axial direction of, they overlap at the same position, but they are spatially separated and exist in an insulated form. Therefore, according to this embodiment, it is possible to provide a highly efficient transformer having no leakage magnetic flux between the coils. An advantage of the transformer 40 according to this embodiment is that since only one conductive pattern is printed on one magnetic sheet, it is not necessary to pay particular attention to a short circuit between two conductive patterns, that is, between two coils.

FIG. 15 shows a fourth embodiment of the multilayer chip transformer according to the present invention. Similar to the third embodiment, the laminated chip transformer 50 according to this embodiment is characterized in that all the conductive patterns have the same shape, but the positions of the through holes are different from each other.
6), 53 (FIG. 17), 55 (FIG. 18) and 57 (FIG. 19) to form three coils. Also in this transformer 50, a yoke magnetic material sheet 59 (FIG. 20) having no conductive pattern is additionally used.

The magnetic material sheets 51, 53, 55, and 57 are arranged from the central portion near the first side (arbitrary reference side) to the fourth side, respectively.
Conductive pattern 5 with about 3/4 turns to the center near the sides
2, 54, 56 and 58 are formed. Both ends of each conductive pattern extend to the middle of the sheet edge 5
2s, 52e; 54s, 54e; 56s, 56e, 58
s, 58e are formed. The suffix s indicates the starting end connection part, and the suffix e indicates the ending end connection part. On the magnetic sheet 51, the ends of the starting connection parts 52s of the conductive pattern 52 and the corresponding 90 ° rotation position (second side) and 180 ° rotation position (third side) are convenient.
Individual through holes H1, H2, H3 are formed.
The magnetic sheet 53 includes a conductive pattern 54 at the starting end connecting portion 5
4s end and corresponding 180 ° rotation position (3rd
Two through holes H1 and H3 are formed in each side. In the magnetic sheet 55, two through holes H1 and H2 are formed at the end of the starting end connecting portion 56s of the conductive pattern 56 and the corresponding 90 ° rotated position (second side). In the magnetic sheet 57, one through hole H1 is formed only at the end portion of the starting end connecting portion 58s of the conductive pattern 58.

As shown in FIG. 15, the winding portion of the multilayer chip transformer 50 is composed of a first layer S1 for the lower yoke and a 21st layer S21 for the upper yoke, which is made of a magnetic material sheet 59 without a conductive pattern. The second layer S2 to the twentieth layer S20 are provided between them. Second layer S2, third layer S3, nineteenth layer S
The nineteenth and twentieth layers S20 are magnetic sheet 57, respectively.
It consists of The fourth layer S4, the 16th layer S16, and the 18th layer S18 are made of a magnetic sheet 55. Fifth
The layer S5 and the seventeenth layer S17 are made of a magnetic material sheet 53. The sixth layer S6 to the fifteenth layer S15 are each made of a magnetic material sheet 51.

A terminal electrode T11 extending from the connecting portion to the leading edge of the conductive pattern 58 of the magnetic sheet 57 of the second layer S2 to the edge of the sheet is formed. Similarly, the terminal electrode T21 is formed at the starting connection portion on the fourth layer S4,
The terminal electrode T31 is formed on the starting end connecting portion on the layer S6, the terminal electrode T32 is formed on the starting end connecting portion on the fifteenth layer S15, and the terminal electrode T22 is formed on the starting end connecting portion on the eighteenth layer S18. The terminal electrode T is provided on the starting end connection portion on the 20th layer S20.
12 are formed.

The magnetic material sheet 57 of the third layer S3 laminated on the second layer S2 is arranged at a relative position rotated 90 ° counterclockwise with respect to the magnetic material sheet 57 of the second layer S2. , Between the two layers S2, S3, the end connection portion of the former conductive pattern and the start connection portion of the latter conductive pattern are
Conductive connection is made through the through hole H1 of the latter magnetic material sheet.

The magnetic sheet 55 of the fourth layer S4 is arranged at a relative position rotated by 180 ° with respect to the magnetic sheet 57 of the third layer S3 in terms of the conductive pattern. Similarly, the magnetic sheet 53 of the fifth layer S5 is
The magnetic sheet 57 of No. 4 is disposed at a relative position rotated 90 ° clockwise. Similarly, the magnetic sheets of the sixth layer S6 to the seventeenth layer S17 are arranged at a relative position rotated clockwise by 90 ° with respect to the magnetic sheets of the layers immediately below. The magnetic sheet of the 18th layer S18 is arranged at a relative position obtained by rotating the magnetic sheet of the 17th layer S17 by 180 °. The magnetic sheet of the 19th layer S19 is rotated 90 degrees clockwise relative to the magnetic sheet of the 18th layer S18.
It is placed with a relative position rotated. 20th layer S2
The magnetic sheet of No. 0 is arranged at a relative position rotated 90 ° counterclockwise with respect to the magnetic sheet of the nineteenth layer S19.

The starting point connecting portion on the fifth layer S5 is conductively connected through its own through hole H1 and the through hole H2 of the layer S4 immediately below, and the starting point connecting portion on the seventh layer S7 is directly connected to its own through hole H1. It is conductively connected to the termination connecting portion of the fourth layer through the through hole H2 of the lower layer S6 and the through hole H3 of the layer S5 therebelow. The starting end connection portion on the eighth layer S8 is the through hole H1 of itself, the through hole H2 of the layer S7 directly below, and the through hole H3 of the layer S6 therebelow.
Is conductively connected to the terminal connection portion of the fifth layer via. The starting end connecting portion on the ninth layer S9 is conductively connected to the terminating connecting portion of the sixth layer through the through hole H1 of itself, the through hole H2 of the layer S8 immediately below, and the through hole H3 of the layer S7 therebelow. . In the following, the same conductive connection is made between every two magnetic sheets at the starting connection portion up to the 17th layer S17. Conductive connection is made between every other magnetic sheets at the starting end connecting portions of the eighteenth layer S18 and the nineteenth layer S19, and conductive connection is made between the magnetic sheet immediately below at the starting end connecting portion of the twentieth layer S20. Is done.

Thus, according to the embodiment of FIG. 15, a coil of about 27/4 turns is formed between the terminal electrodes T11 and T12, and a coil of about 18/4 turns is formed between the terminal electrodes T21 and T22. A three-winding type multilayer chip transformer 50 in which a coil of approximately 12/4 turns is formed between the electrodes T31 and T32 can be configured. These three sets of coils are overlapped at the same position when viewed from the axial direction of the transformer 50, but are spatially separated and exist in an insulated form. Therefore, according to this embodiment, it is possible to provide a highly efficient transformer having no leakage magnetic flux between the coils. Also in this transformer 50, since only one conductive pattern is printed on one magnetic sheet, it is not necessary to pay particular attention to a short circuit between two conductive patterns, that is, between two coils.

[0054]

As described above, according to the present invention, there is provided a highly efficient, multi-winding multilayer chip transformer which does not generate a leakage magnetic flux passing between coils in the axial direction, is easy to print a conductive pattern. Can be provided.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a first embodiment of a multilayer chip transformer according to the present invention.

FIG. 2 is a plan view of a first magnetic sheet used in the chip transformer of FIG.

FIG. 3 is a plan view of a second magnetic sheet used in the chip transformer of FIG.

FIG. 4 is a plan view of a third magnetic material sheet used in the chip transformer of FIG.

FIG. 5 is an exploded perspective view showing a second embodiment of the multilayer chip transformer according to the present invention.

6 is a plan view of a first magnetic sheet used in the chip transformer of FIG.

7 is a plan view of a second magnetic sheet used in the chip transformer of FIG.

8 is a plan view of a third magnetic material sheet used in the chip transformer of FIG.

9 is a plan view of a fourth magnetic sheet used in the chip transformer of FIG.

FIG. 10 is an exploded perspective view showing a third embodiment of the multilayer chip transformer according to the present invention.

11 is a plan view of a first magnetic material sheet used in the chip transformer of FIG.

12 is a plan view of a second magnetic sheet used in the chip transformer of FIG.

13 is a plan view of a third magnetic material sheet used in the chip transformer of FIG.

14 is a plan view of a fourth magnetic sheet used in the chip transformer of FIG.

FIG. 15 is an exploded perspective view showing a fourth embodiment of the multilayer chip transformer according to the present invention.

16 is a plan view of a first magnetic sheet used in the chip transformer of FIG.

17 is a plan view of a second magnetic material sheet used in the chip transformer of FIG.

FIG. 18 is a plan view of a third magnetic sheet used in the chip transformer of FIG.

19 is a plan view of a fourth magnetic material sheet used in the chip transformer of FIG.

20 is a plan view of a fifth magnetic material sheet used in the chip transformer of FIG.

FIG. 21 is a plan view of a magnetic sheet that constitutes a conventional multilayer chip transformer.

[Explanation of symbols]

2 Multilayer Chip Transformer S1 to S13 Layers 10, 15, 18 Magnetic Sheets 11, 13, 16 Conductive Patterns 12, 14, 17 Through Holes T11, T12, T21, T22 Terminal Electrodes 20 Multilayer Chip Transformer S1 to S16 Layers 21 , 25, 28, 30 Magnetic sheet 22 to 24, 26, 27, 29 Conductive pattern H Through hole T11, T12, T21, T22 Terminal electrode 40 Multilayer chip transformer S1 to S13 layer 41, 43, 45, 47 Magnetic body Sheets 42, 44, 46 Conductive patterns H1, H2, H3 Through holes T11, T12, T21, T22 Terminal electrodes 50 Multilayer chip transformer S1 to S21 layers 51, 53, 55, 57, 59 Magnetic material sheets 52, 54, 56 , 58 conductive patterns H1, H2, H3 through holes T11, T12, T21, T22, T31, T32 terminal electrodes

Claims (8)

[Claims] 1. A first magnetic material sheet laminate having a square shape having a coil and a second magnetic material sheet laminate having a square shape arranged above and below the first magnetic material sheet laminate, wherein the first magnetic material sheet laminate is A linear conductive pattern for the first coil and a conductive pattern for the second coil that are parallel to each other are formed close to the end edges of the two sides facing each other, and the conductive patterns for the first coil and the conductive pattern for the second coil are respectively formed at the start ends located at diagonal positions of the conductive patterns. It is composed of a plurality of magnetic material sheets with through holes formed therein, and these magnetic material sheets are sequentially opposed by 90 ° so that the end of one conductive pattern of the adjacent magnetic material sheet and the start of the other conductive pattern face each other. The coils are stacked by shifting the positions, and for each coil, the end of one conductive pattern and the start of the other conductive pattern of the adjacent magnetic sheet are formed at the start of the other conductive pattern. Multilayer chip transformer, characterized in that through the through holes constituting the two pairs of coils of one turn every four magnetic sheets by connecting conductive that. 2. The first magnetic sheet laminate has one side on at least one of a lower layer and an upper layer of the magnetic sheet on which two conductive patterns are formed for adjusting the number of turns of two sets of coils. A single linear conductive pattern formed in the vicinity of the edge of the conductive sheet, and at least one magnetic sheet having a through hole formed at the starting end of the conductive pattern is further provided. The multilayer chip transformer according to claim 1. 3. A hexagonal first magnetic material sheet laminated body having a coil and a hexagonal second magnetic material sheet laminated body arranged above and below the coil, the first magnetic material sheet laminated body. Is formed by forming three linear conductive patterns that are close to the edges of every other three sides and are parallel to the edges, and through holes are formed at the start positions of the conductive patterns. It is composed of a magnetic material sheet, and these magnetic material sheets are laminated by sequentially shifting the relative position by 60 ° so that one end of one conductive pattern of the adjacent magnetic material sheet and the other end of the other conductive pattern face each other, For each coil of each magnetic material sheet, the end of one conductive pattern of the adjacent magnetic material sheet and the start end of the other conductive pattern are conductively connected through a through hole formed at the start end of the other conductive pattern. Multilayer chip transformer, wherein the constituting three sets of coils 1 turn per six magnetic sheet by Rukoto. 4. The first magnetic material sheet laminated body comprises the
And forming at least one of the lower layer and the upper layer of the magnetic material sheet on which the two conductive patterns are formed, two linear conductive patterns that are close to the edges of every other two sides and are parallel to the edges. A magnetic sheet of a second pattern in which a through hole is formed at the beginning of the conductive pattern;
At least one of at least one of the magnetic sheet of the third pattern in which one linear conductive pattern which is close to the edge of the side and which is parallel to the edge is formed and a through hole is formed at the starting end of the conductive pattern is used. 4. The multilayer chip transformer according to claim 3, further comprising one sheet. 5. A quadrangular first magnetic material sheet laminated body having a coil and a quadrangular second magnetic material sheet laminated body arranged above and below the quadrangular magnetic sheet laminated body, wherein the first magnetic material sheet laminated body is composed of: Each of the three-quarter turns starts from the central part close to the edge of the first side and runs parallel to it along the fourth side from the first side and ends at the central part close to the edge of the fourth side. It consists of multiple magnetic sheets with conductive patterns formed on them.
A first through hole formed between the start end and the edge of each conductive pattern and conductively connected to the start end, and a second side rotated by 90 ° from the first through hole are formed to be insulated from the conductive pattern. A first pattern magnetic sheet having a second through hole, and a third through formed at a corresponding position of the first through hole and a third side rotated 180 ° from the first through hole so as to be insulated from a conductive pattern. Consisting of a second pattern magnetic sheet having holes,
9 magnetic sheets of these two patterns are alternately and sequentially
The relative positions of the magnetic sheets are laminated by shifting the relative position by 0 °, and the end of one conductive pattern and the start of the other conductive pattern of every other magnetic sheet are formed in the through hole and the middle formed at the start of the other conductive pattern. It is characterized in that the conductive patterns of every other magnetic material sheet form two pairs of coils by conductively connecting each other through through holes formed at corresponding positions of the intervening magnetic material sheets. Multi-layer chip transformer. 6. A third pattern in which the first magnetic sheet laminate has only the first through hole in at least one of a lowermost layer and an uppermost layer for adjusting the number of turns of two sets of coils. 6. The multilayer chip transformer according to claim 5, further comprising at least one magnetic sheet of the above. 7. A quadrangular first magnetic material sheet laminated body having a coil and a quadrangular second magnetic material sheet laminated body arranged above and below the quadrilateral magnetic material sheet laminated body, wherein the first magnetic material sheet laminated body is Each of the three-quarter turns starts from the central part close to the edge of the first side and runs parallel to it along the fourth side from the first side and ends at the central part close to the edge of the fourth side. A first through hole that forms a conductive pattern and is conductively connected to the starting end and the edge of each conductive pattern and conductively connected to the starting end, and a conductive pattern at a corresponding position on a second side rotated 90 ° from the first through hole. Of the first pattern having a second through hole formed by being insulated from the conductive pattern and a third through hole formed by being insulated from the conductive pattern at a corresponding position on the third side rotated by 90 ° from the second through hole. Body sheets sequentially The relative positions of the magnetic sheets are laminated by shifting the relative position by 0 °, and the end of one conductive pattern and the start of the other conductive pattern of every two magnetic sheets are formed in the through hole and the middle formed at the start of the other conductive pattern. Conductive connection to each other through through holes formed at corresponding positions of two intervening magnetic material sheets to form a continuous three pairs of coils with conductive patterns of every two magnetic material sheets. The laminated chip transformer characterized in that 8. The first magnetic sheet laminate has the first through hole and the third through hole in at least one of a lowermost layer and an uppermost layer for adjusting the number of turns of three sets of coils.
Second magnetic sheet having only the through holes, a third magnetic sheet having only the first through holes and the second through holes, and a fourth magnetic sheet having only the first through holes. 8. At least one magnetic material sheet of at least one of the magnetic material sheets of the pattern is additionally provided.
The described laminated chip transformer.