JPH04196507A - Thin type transformer - Google Patents

Abstract

PURPOSE:To obtain a thin type transformer of small height even in the case of a winding requiring a large current, by constituting a secondary winding in a structure wherein thin wide zigzag type plate conductors are bent at the conductor end surface, the part between layers are electrically insulated, and the conductors are combined to form a square space in the center where magnetic flux is concentrated when a current flows through the conductors. CONSTITUTION:A winding which forms a secondary winding is constituted as follows. Conductor 1 is formed in a shape in which a thin plate connects U-shaped adjacent ends and repeats a zigzag configuration, an insulating layer is formed on the conductor surface. The conductor is bent from conductor bending parts 2, shown by broken lines, of the end surfaces of the conductor 1, in the order of arrows A, B, C and D. By stacking them in a square shape, the secondary winding 16 is formed. In a primary winding, a conductor thin plate is cut into an U-shape, and a primary winding 8 is formed by using conductors. Hence in the case of large current capacity, the secondary winding can be constituted of thin planar conductors, so that a thin type transformer capable of thinning the effective height can be constituted. Since the conductors of the primary and the secondary windings are thin, a thin type transformer whose copper loss is small in the case of high frequency application can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION A1.Object of the invention [Field of industrial application] The present invention relates to a thin transformer that is used in electronic equipment and the like and is thin in the height direction.

[Conventional technology]

An example of an assembled structure of a conventional thin transformer is shown in FIG. 5, and an assembled product is shown in FIG.

In conventional thin transformers, the secondary winding (or primary winding) is made of copper wire with a circular cross section to form the copper wire-wound coil 13, and the primary winding is made of a conductor made of a thin copper plate shaped into a U-shape. Winding (
or a secondary winding) 8, a square-shaped electrical insulating sheet 7 is sandwiched between the divided magnetic core 10 and the primary winding 8, and between the primary winding M8 and the copper wire-wound coil 13. The winding coil 13 is attached to the base 4
The terminals 9 of the primary winding 8 are passed through the terminal guide groove 6, and the lead wire 14 of the copper wire-wound coil 13 is assembled using the collar 5 as a guide.
Connect the split magnetic core 10 to the connecting terminal 15, and attach the split magnetic core 10 to the base 4.
A thin transformer was formed by abutting each other through the collar 5 and fixing the outer periphery with a core fixing tape 11.

[Problem to be solved by the invention] In the conventional technology described above, when forming the secondary winding, the copper wire-wound coil is formed using a special type of round wire, so the current in the secondary winding is When a large current is required, it is necessary to use a copper wire with a large diameter, which poses a problem when a thin transformer with a thin shape in the height direction is required.

The present invention is a thin transformer that is thin in the height direction, and can form a coil without using special wires, even when the secondary winding requires a large current. The purpose is to provide a low-profile, thin transformer with the following characteristics.

1. Structure of the invention [Means for solving the problem] The present invention connects one adjacent end of a thin plate-like wide U-shape to a secondary winding with a conductor, and uses a thin plate meandering in a zigzag shape. It consists of a good electrical conductor (hereinafter referred to as "conductor"), and the conductor is formed by repeating this meandering pattern, which is then bent alternately at the end to form an opening shape, and the conductor plates are electrically insulated with a thin electrically insulating film or coated with electrically insulating paint. The secondary winding is formed by folding and overlapping each other in the shape of a mouth so that the magnetic field created by the current flowing through the conductor at the center of the winding concentrates in the center space of the winding.

That is, in the present invention, a thin plate of good electrical conductor is formed into a zigzag shape and a meandering shape in a straight line, and is formed to have a space in the center into which the magnetic legs of the divided magnetic core forming the transformer are inserted.
The surface of the conductor is electrically insulated and folded along the end face of the conductor so that the magnetic field generated by the current flowing through the conductor is applied to the center of the bent annular conductor.
An insulating sheet that forms a primary winding or a secondary winding and electrically insulates the primary winding and the secondary winding, and the secondary winding;
This thin transformer is characterized in that the split magnetic core is assembled by fitting the flange of the base into the guide.

[Effect]

The secondary winding that makes up the thin transformer is formed into a U-shape with a wide, thin plate, and one adjacent end of the wire is connected with a thin plate conductor.
The whole is made into a continuous thin plate conductor that meanderes in a zigzag pattern, and the end faces of the meandering conductor are alternately bent inward to form a mouth-shaped space in the center so that the magnetic field generated by the current flowing through the conductor is energized. . The layers of the laminated conductor are bonded and fixed using a resin film or resin.

Therefore, even when the current capacity is large, the secondary winding can be formed from a thin plate-shaped conductor, so a thin transformer can be constructed with a reduced mounting height.

Furthermore, since the conductors of the primary and secondary windings are thin, a thin transformer with a small copper loss value can be used when used at high frequencies.

〔Example〕

Embodiments of the present invention are shown in FIGS. 1 and 2, and FIGS.
The figure shows an embodiment in which the secondary winding is formed from a thin plate.

FIG. 3 shows a thin plate conductor forming a meandering secondary winding formed in a zigzag shape, and the secondary winding is formed by the thin plate conductor forming procedure shown in FIG.

As shown in FIG. 4, the winding according to the present invention is formed by forming a conductor 1 in the shape of repeating meandering by connecting two adjacent ends of a U-shaped thin plate. After forming the insulating layer, a conductor bent portion 2 shown by a broken line on the end face of the conductor 1 is formed.
From there, it is folded in the order of arrows A, B, and C1D, and then folded in the shape of an opening to form the secondary volume MA16 shown in FIG.

On the other hand, the primary winding 8 is formed by cutting a thin conductor plate into a U-shape. In addition, a square-shaped insulating sheet 7 is sandwiched between the divided magnetic core 10 and the primary winding 8 and between the primary winding 8 and the secondary winding 16, and this coil is guided to the collar 5 of the base 4. The terminals 9 of the primary winding 8 and the mounting terminals 3 of the secondary winding 16 are passed through the terminal guide groove 6, and then placed on the base 4.
The mounting terminal 3 is formed by bending it parallel to the bottom surface of the board. Next, the divided magnetic cores 10 are passed through the collar 5 of the base 4 and abutted against each other from above and below, and the outer periphery is fixed with the core fixing tape 11, thereby constructing a thin transformer.

With this configuration, the secondary winding does not use a special type of copper wire, but uses a thin, wide conductor, so it has a thinner cross-section and a higher current capacity than conventional round wires. It can be made into a thin transformer.

C1 Effects of the invention 〔Effect of the invention〕 As described above, the thin transformer according to the present invention is as follows.

The secondary winding is made of thin, wide conductors that meander in a zigzag pattern, bent at the ends of the conductors, electrically insulated between the layers, and assembled into a square shape in which when current flows through the conductors, the magnetic field is concentrated in the center space of the mouth. This structure makes it possible to provide a thin transformer with a small height even for windings that require large currents.

Although the embodiments of the present invention have been described using a thin plate conductor laminated to the secondary winding, it is of course possible to use a laminated thin plate conductor to the primary winding.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a thin transformer according to the present invention. FIG. 2 is an assembled perspective view of the thin transformer according to the present invention. FIG. 3 is a perspective view of a wire-wound conductor according to the present invention. FIG. 4 is a perspective view showing an example of forming a winding wire using a conductor according to the present invention. FIG. 5 is an exploded perspective view of a conventional thin transformer. FIG. 6 is an assembled perspective view of a conventional thin transformer. l...Conductor, 2...Conductor bent portion, 3...Mounting terminal, 4...Base, 5...Brim, 6...Terminal guide groove, 7...Insulating sheet, 8 ...Primary winding, 9...terminal, 1o...divided magnetic core, 11...core identification tape,
12... Secondary mounting terminal, 13... Copper wire wound coil, 1
4...Lead wire, 15...Connection terminal, 16...2
Next winding. Patent applicant Tokin Co., Ltd. Figure 1 Figure 3

Claims (1)

[Claims] 1. A thin plate of good electrical conductor is formed into a meandering shape in a zigzag and straight line, with a space in the center for inserting the magnetic legs of the divided magnetic core that forms the transformer, and the surface of the conductor is electrically insulated. The magnetic field caused by the current flowing through the conductor by bending it along the end face is folded in a shape such that the magnetic field is applied to the center of the bent annular conductor to form a primary winding or a secondary winding. , an insulating sheet that electrically insulates the primary winding and the secondary winding, the secondary winding, and the divided magnetic core are assembled by fitting the flange of the base into the guide. .