JPH0362909A - Laminated transformer having intermediate tap - Google Patents

Abstract

PURPOSE:To achieve a compact configuration both for the thickness and the lateral width by connecting the conducting piece of each set to a neighboring conductor piece through the edge part of a magnetic piece, forming one coil, winding two sets of coils in the reverse directions to each other approximately around a common axial line, connecting the coil to either of the upper and lower ends, and constituting one intermediate tap. CONSTITUTION:Conductor pieces 3 and 3' for primary and secondary coil windings are printed in a nesting shape to each other and made to extend. End parts are connected 5, and an intermediate tap 5' is formed. End parts 7 and 7' of the conductor pieces 3 and 3' are made to remain, and magnetic pieces 9 and 9' are printed at both side parts. Primary and secondary coil conductor pieces 11 and 11' are printed on the end parts 7 and 7'. The side parts of the conductor pieces 11 and 11' are made to remain, and a conductor piece 13 is printed and connected to the side parts. Conductor pieces 15 and 15' are printed at the deviated positions to each other. End parts 17 and 17' of the conductor pieces 15 and 15' are made to remain, and both side parts 19 and 19' are printed. The same steps are repeated, and conductor pieces 21 and 21' are printed and connected to the end parts 17 and 17'. Input/output lead parts 23 and 23' are formed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a laminated transformer, and more particularly to a laminated transformer with an intermediate tap.

[Prior Art] Transformers are used in interstage coupling circuits such as analog circuits or pulse circuits including radio receivers, tuning circuits,
Used in filter circuits, oscillation circuits, etc. Transformers are required to be compact, and to be able to perform impedance conversion, polarity conversion, or change in effective inductance value by changing the primary/secondary winding ratio.

Further, it may be desired to use a transformer within a range in which the magnetic permeability μ or magnetic flux density B of the magnetic material of the transformer has linearity with respect to the strength H of the magnetic field applied to the magnetic material.

The intermediate tap is used to obtain a predetermined impedance conversion, polarity conversion, or effective inductance value change.

Such conventional stacked type center-tapped transformers are illustrated in FIGS. 11 to 19 and 21 to 28.

These figures are plan views illustrating the manufacturing process of a laminated transformer using a lamination technique such as a vapor phase method such as a printing technique, a sputtering or a vapor deposition technique. The examples are based on printing technology. In addition, in the manufacturing process of a multilayer transformer with an intermediate tap, a plurality of multilayer transformers are generally stacked on a wide easily peelable substrate.
Only one laminated transformer will be described.

Referring to FIG. 11, electrically insulating magnetic ferrite is coated on the entire surface of an easily peelable substrate (not shown) in which polyester (preferably polyethylene terephthalate film) is formed on the surface of a substrate (such as aluminum) with high planar smoothness. A layer 41 is printed, and on top of that, about half a turn of the conductive layer 43 that forms the primary coil is printed, and this is pulled out to the left to form a lead-out part 45, and about half a turn of the conductive layer 43 that forms the secondary coil is printed. A conductive layer 43' is printed on the right side and is pulled out to the right to form a lead-out portion 45'. In order to form the intermediate tap, as will be described later, the drawer portions 45 and 45' are baked and the second
The terminals 69, 73 may be suitably connected externally as shown in Figure 0, or the conductive layers 43, 43' may be connected to each other by printing.

The conductive layers 43, 43' constituting the primary and secondary coils are printed laterally spaced apart from each other. Next, as shown in FIG. 12, a magnetic ferrite layer 49 is printed leaving end portions 47.47' of the conductive layer 43.43'. Next, as shown in FIG. 13, about half a turn of conductive layer 51, 51' is printed connected to one end 47, 47'. Next, as shown in FIG. 14, a magnetic ferrite layer 55 is printed leaving one end 53.53' of the conductive layer 51.51', and then, as shown in FIG. A conductive layer 57, 57' for about half a turn is printed in connection with the conductive layer 57, 57'. Next, as shown in FIG. 16, a magnetic ferrite layer 61 is printed leaving one end 59.59' of the conductive J'i 57.57'. In order to obtain the desired number of coil windings, the lamination process shown in FIGS. 12 to 15 may be repeated as many times as necessary. After completing the desired lamination, as shown in FIG. 17, conductive layers 63, 63' are printed by connecting to one end 59, 59' of conductive layers 57, 57', and drawn out on the left side or right side, respectively. to form a pull-out portion 65,65'. Next, as shown in FIG. 18, magnetic ferrite 67 is applied to the entire surface.
After printing, sinter the necessary external bow [output terminal 69.7
1.73.75 and appropriate external connections of the terminals 69.73, a center-tapped laminated transformer is obtained. FIG. 20 shows a schematic circuit diagram of this center-tapped multilayer transformer.

The manufacturing process of a multilayer transformer with an intermediate tap according to another conventional technique is shown in FIGS. 21 to 28. First, as shown in FIG. 21, a magnetic layer 81 made of magnetic ferrite or the like is printed on an easily peelable substrate (not shown), and one half turn of the magnetic layer 81 is printed on that surface.
Next, print a conductive layer 83 for the coil. Note that the conductive layer 83
One end 85 of is drawn out to the side of the magnetic 1'W81.

Next, as shown in FIG. 22, the conductive layer 83 is covered with a magnetic layer 89 except for one end 87 of the conductive Ji 83. Next, as shown in FIG. 23, a conductive layer [91] for about half a turn is printed connected to one end 87 of the conductive layer 83. It is clear that in order to obtain a partial coil with the desired number of turns, the same lamination as shown in FIG. 23 may be performed. After finishing the desired lamination, the second
As shown in Fig. 4, a magnetic layer 95 is printed leaving one end 93 of the conductive N91, and then connected to the one end 93, a conductive layer 97 of about % turns is printed to the side of the magnetic layer 95. It is pulled out to form an intermediate tap pull-out part 99, and connected to a part of the conductive layer 97 for the secondary coil to form the conductive layer 101 for the secondary coil.
print. Next, as shown in FIG. 25, a magnetic layer 105 is printed leaving one end 103 of the conductive layer 101, and then
A conductive layer 107 for about half a turn is printed connected to one end portion 103. It is clear that in order to obtain a secondary coil with the desired number of turns, the same lamination as shown in FIG. 25 may be performed.

After completing the desired lamination, as shown in FIG.
The magnetic layer 111 is printed leaving one end 109 of
3 and print one end 115 of the conductive N113 on the magnetic layer 11.
Pull it out to the side of 1. Next, as shown in FIG. 27, a magnetic layer 117 is printed on the entire surface and sintered, and the necessary external terminals 119 are
．． By performing the baking of 121 and 123, a laminated transformer with an intermediate tap is obtained. FIG. 29 shows a schematic circuit diagram of this center-tapped multilayer transformer.

[Problems with the prior art] It is said that the thickness of the laminated transformer with an intermediate tap obtained by the lamination process shown in FIGS. 11 to 19 can be reduced because the primary coil and the secondary coil are laminated in parallel. Although this method is effective, it has the problem that the width increases. In addition, in the case of the center-tapped multilayer transformer shown in FIGS. 21 to 28, the primary and secondary coils are sequentially stacked, which has the effect of suppressing the width of the multilayer transformer, but the thickness increases. This has the problem of inviting As described above, none of the intermediate tapped multilayer transformers fully satisfies the demand for miniaturization required for multilayer transformers.

[Overview of the present invention] An overview of the present invention will be described with reference to FIGS. 1 to 10. As shown in FIGS. 1 to 9, according to the present invention, a plurality of
A conductive piece for forming a secondary coil winding and a plurality of conductive pieces for secondary coil winding are laminated simultaneously in parallel so that each conductive piece rotates in opposite directions around a common rotation axis via a magnetic piece. Therefore, it is possible to obtain a multilayer transformer with an intermediate tap that is both smaller in width and thickness. As shown in FIG. 2, the intermediate tap is formed at the beginning or end of the primary coil conductive piece and the secondary coil conductive piece, which are printed in opposite directions.
It is obtained by connecting the primary coil conductive piece and the secondary coil conductive piece and pulling them out to the sides of the magnetic piece.

That is, according to the present invention, two sets of alternating laminates of a plurality of conductive pieces and a plurality of magnetic pieces are provided to form two sets of coils, and the conductive pieces of each set are arranged at the edges of the magnetic pieces. connected to adjacent conductive pieces through the coil to form one coil,
With an intermediate tap, the two sets of coils revolve in opposite directions around a substantially common axis, and each coil is connected to each other at a starting end or a terminal end of a conductive piece to form an intermediate tap. A stacked transformer is provided.

[Detailed Description of the Invention] FIG. 1 is a plan view illustrating the manufacturing process of a multilayer transformer with an intermediate tap according to the present invention.

Hereinafter, an example of a multilayer transformer with an intermediate tap according to the present invention will be described in detail.

In the manufacturing process of a multilayer transformer with an intermediate tap, a plurality of multilayer transformers are simultaneously laminated on the same easily peelable substrate, but for convenience of explanation, a single multilayer transformer will be described below. Further, in the following description, the lamination process will be explained as being based on a conventional well-known printing technique, but it is also possible to perform the lamination using a thin film method such as a sputtering method or a vapor deposition method. Various conventional conductive materials can be used as the material for the conductive piece for forming the coil winding, and various conventional magnetic materials can also be used as the material for the magnetic piece. Examples of possible materials for the conductive piece include Ag (silver), A
u (gold), Cu (copper), Pd (palladium), Ag-
A paste-like material made by kneading powder such as Pd (silver-palladium) alloy with a suitable binder can be considered, but
A paste made by kneading various metal powders and a suitable binder can be considered. Furthermore, when using the vapor deposition method,
Any conductive material such as AI, NiCr-Au, Cr-Au, etc. is contemplated. Furthermore, as the magnetic piece, magnetic materials such as Zn ferrite, Mn-Zn ferrite, Ni-Cu-Zn ferrite, and Fe2O ferrite can be considered. In addition, as will be described later, in order to increase the magnetic resistance of the magnetic circuit including the magnetic core and to use the magnetic core within a range where the B-H (in μm) curve of the magnetic core has linearity, a part of the magnetic piece is It is also possible to laminate an insulating non-magnetic material on the substrate. The insulating nonmagnetic material can be selected from nonmagnetic ferrites such as Cu-Zn ferrite, alumina layers, barium titanate, titanium oxide, and the like.

The manufacturing process of an example of the center-tapped multilayer transformer according to the present invention illustrated in FIGS. 1 to 9 will be described.

As shown in Fig. 1, it is also possible to print a magnetic layer 1 on the entire surface of an easily peelable substrate (not shown), and print a magnetic piece 2 for printing level difference correction in the center of this magnetic layer 1. be. Then the second
As shown in the figure, conductive piece 3 for primary coil winding (hereinafter simply 1
(referred to as the secondary coil conductive piece) and the secondary coil winding conductive piece 3' (hereinafter simply referred to as the secondary coil conductive piece)
are inserted into each other and printed and extended in a ten-shape, the ends of the coil conductive pieces are connected 5, and drawn out to the sides of the magnetic layer 1 to form intermediate taps 5'. The number of turns in the primary and secondary coil conductive pieces is preferably about % turns.

The same applies to the following conductive pieces. Next, as shown in FIG. 3, one end 7. of the primary and secondary coil conductive pieces 3.3'.
Print magnetic pieces 9 and 9' on both sides, leaving 7'. Preferably, the magnetic strips 9,9' are printed to have a complementary shape to the magnetic strip 2. The same applies to the following magnetic pieces. Next, as shown in FIG. 4, the primary and secondary coil conductive pieces 3.
Connect to one end 7.7' of 3' and print the primary and secondary coil conductive strips 11.11'. 6. Next, leave the sides of the conductive strips 11.11' as shown in Figure 5. magnetic piece 1 in the center
Print 3. Next, as shown in FIG.
Connect the conductive pieces 15.15 to the sides of 1' and shift them from each other.
' to print. Next, as shown in FIG. 7, the conductive piece 15.1
Leave 17.17' at one end of 5' and 19.19 on both sides.
’ is printed. In order to obtain a primary coil and a secondary coil with the desired number of windings, the same steps as shown in FIGS. 3 to 6 can be repeated. Next, as shown in FIG.
′, print conductive pieces 21 and 21′, and print magnetic pieces 19
．． 19' to form the input/output lead-out part 23 and 23' of the multilayer transformer with an intermediate tap.Next, as shown in Fig. 9, a magnetic piece (not shown) is attached to the center part, and the entire surface is After printing a magnetic layer (not shown) on the substrate, it is sintered and the necessary external lead terminals 25, 27, 29 are baked to obtain a multilayer transformer with an intermediate tap.

FIG. 10 is a one-size circuit diagram of a multilayer transformer with an intermediate tap obtained by the lamination process shown in FIGS. 1 to 9.

Note that the second embodiment of the multilayer transformer with center tap according to the present invention
As an example, an insulating non-magnetic layer (
For example, a structure in which non-magnetic ferrite such as Cu--Zn ferrite, etc.) are laminated may also be considered.

The embodiments of the multilayer transformer with an intermediate tap according to the present invention have been described above, but it is also possible to increase or decrease the distributed capacitance between the conductive pieces by appropriately shifting and printing the primary/secondary coil conductive pieces. It is. Furthermore, it is obvious that the size, shape, etc. of the conductive piece and the magnetic piece can be changed as desired.

[Operations and Effects of the Present Invention] A detailed description of the present invention will be made regarding the center-tapped multilayer transformer of the present invention illustrated in FIGS. 1 to 10. Since the transformers are laminated substantially around the rotation axis, a laminated transformer with reduced thickness and width can be obtained.

In addition, by forming an insulating non-magnetic layer on a part of the magnetic piece, the transformer can be used within a range where the magnetic permeability μ of the magnetic material is linear with respect to the applied magnetic field strength H. This makes it possible to improve the linearity of the transformer.

Furthermore, by printing adjacent magnetic pieces in mutually complementary shapes, a laminated transformer with a constant thickness can be obtained.

Although preferred embodiments of the present invention have been described above, it will be obvious to those skilled in the art that various modifications and applications can be made without departing from the technical idea of the present invention.

For example, although a multilayer transformer with an intermediate tap has been disclosed in which the intermediate tap is formed at the starting end of the coil winding, one in which the intermediate tap is formed at the terminal end of the coil winding should also be included within the technical concept of the present invention. Further, the positions, shapes, sizes, etc. of the external lead terminals and the coil windings can be changed as appropriate by those skilled in the art.

4, 11, l0 FIGS. 1 to 9 are plan views illustrating the manufacturing process of a multilayer transformer with an intermediate tap according to the present invention.

FIG. 10 is an equivalent circuit diagram of a multilayer transformer with an intermediate tap according to the present invention obtained by the manufacturing process shown in FIGS. 1 to 9.

FIGS. 11 to 19 are plan views illustrating the manufacturing process of a conventional center-tapped multilayer transformer.

FIG. 20 is a schematic circuit diagram of a conventional center-tapped multilayer transformer obtained by the manufacturing process shown in FIGS. 11 to 19.

FIGS. 21 to 28 are plan views illustrating the manufacturing process of a conventional center-tapped multilayer transformer.

FIG. 29 is a schematic circuit diagram of a conventional center-tapped multilayer transformer obtained by the manufacturing process shown in FIGS. 21 to 28.

Claims (4)

[Claims] (1) Consisting of two sets of alternating laminates of a plurality of conductive pieces and a plurality of magnetic pieces to form two sets of coils, and the conductive pieces of each set are adjacent to each other through the edges of the magnetic pieces. The two sets of coils are connected to a conductive piece to form one coil, and the two sets of coils revolve in opposite directions around a substantially common axis, and each coil is connected to each other at one of its upper and lower ends. A multilayer transformer with an intermediate tap, characterized by comprising one intermediate tap. (2) Two sets of alternating laminates of a plurality of conductive pieces and a plurality of magnetic pieces are provided to form two sets of coils, and the conductive pieces of each set are adjacent to each other through the edges of the magnetic pieces. The coils are connected to each other to form a single coil, the coils orbiting in opposite directions about a substantially common axis, and each coil is connected to one another at either its upper or lower end to form a single intermediate tap. A multilayer transformer with an intermediate tap, characterized in that adjacent magnetic pieces among the plurality of magnetic pieces are formed in mutually complementary shapes. (3) The multilayer transformer with an intermediate tap according to claim 1 or 2, wherein a part of the magnetic piece is formed with an insulating non-magnetic material. (4) The multilayer transformer with an intermediate tap according to claim 1 or 2, wherein the entire transformer is sintered.