JPH0347307Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a transformer, and more particularly, to a thin transformer using a sheet coil.

[Prior art]

Traditionally, transformers are made by winding copper strips and round wires with circular or square cross sections around a core to create the primary and secondary coils, and the legs of the U-shaped or E-shaped core are inserted into the central hole of the core. It was made by inserting it through the magnetic field to form a closed magnetic path.

Therefore, for this conventional transformer, it is difficult to wind copper strips and round wires with relatively large cross-sectional areas around the winding core, the height of the transformer is large compared to other electronic components, and the wiring board There was a problem that it was not suitable for installation.

A transformer with a thin and simple shape is desired from the viewpoint of promoting automatic insertion of electronic components into wiring boards.

[Purpose of invention]

Therefore, an object of the present invention is to provide a thin transformer that does not require winding work.

[Structure of the idea]

According to the present invention, first and second sheet coils and a pair of pot-shaped cores that are combined with each other to form a sheet coil storage space that can store at least one of the first and second sheet coils are provided. have,
Each of the first and second sheet coils has two inner through holes and two outer through holes formed in the annular insulating sheet, and one of the inner through holes and one of the outer through holes. The inner surface of the insulating sheet is coated with a terminal by a conductor, and a spiral conductor having a different number of turns is formed on one side of the insulating sheet with the two conductor coating through holes as starting and ending points. Each of the pot-shaped cores has an annular recess for forming the sheet coil storage space, and the bottom of one of the pair of pot-shaped cores has four through holes corresponding to the four through holes of the sheet coil. An insulating member having two terminal insertion holes is fitted,
At least one of the first and second sheet coils is laminated in such a manner that the conductor coating through holes of each sheet coil are not communicated with each other, and the terminal coating through holes are communicated with the terminal covered through holes, and The four terminal insertion holes of the insulating member and the four through holes of the first and second sheet coils are housed in the annular sheet coil storage space formed by the pair of pot-shaped cores. A transformer is obtained in which pin terminals are inserted, and one end of each pin terminal is exposed to the outside of the pot-shaped core.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

1 and 2 are plan views each showing an example of a sheet coil used in the transformer of the present invention. In the figure, an annular insulating sheet 1 has four through holes 2a, 2b, 2 on substantially the same diameter.
c and 2d are formed symmetrically with respect to the center of the sheet 1. The inner surfaces of one of the inner through holes and one of the outer through holes 2a and 2b (both of the through holes are located on one radius in the figure) are coated with a terminal by a conductor. This conductor coating is for electrically connecting a spiral conductor and a pin terminal, which will be described later. The sheet coil A shown in FIG. 1 is a primary coil in which a spiral conductor 3 with five turns is attached on one side of an insulating sheet 1 with the conductor coating through holes 2a and 2b (painted in black) as starting and ending points. The sheet coil B shown in FIG. 2 is a secondary coil unit to which a spiral conductor 4 having three turns is similarly attached. In addition, in the figure, conductors 3 and 4
is shown in a simplified manner as a line, but it goes without saying that it has width and thickness. The finished shape varies depending on the output of the transformer, but the diameter is
A thin transformer with a height of 15 to 50 mm and a height of 5 to 20 mm is formed.

FIG. 3 shows an example of a pair of pot-shaped cores 5 and 6 used in the present invention, both of which have an annular recess 7 in which the annular insulating sheet 1 can be accommodated.
As shown in FIG. 4, the pot-shaped core 5 has an insulating member 8 fitted on its bottom with substantially the same diameter, and the insulating member 8 has holes at positions corresponding to the through holes 2a to 2d of the insulating sheet. A terminal insertion hole 9 is formed.

FIG. 5 is a partially cutaway front view of the thin transformer according to the present invention, and FIG. 6 is an enlarged sectional view of the main part thereof. Referring to FIGS. 5 and 6, in this transformer, first, two sheet coils B are connected to the second sheet coil B.
As shown in the figure, stack the conductor coating through holes 2a and 2b on the right side, and place 3 of the sheet coils A on top of them.
The conductor coating through holes 2a, 2b of sheet coil B and the through holes 2d, 2c of sheet coil A are placed with the conductor coating through holes 2a, 2b on the left side as shown in FIG.
The pot-shaped core 6 and the pins 11p, 11p', 11s, 11 are placed on top of each other so that they communicate with each other.
A laminated coil is made by superimposing annular insulating plates 10 for insulating from s'. Next, this laminated coil is inserted into the annular recess 7 of the pot-shaped core 5.
Then, each of the communication holes 2a to 2d is inserted so as to face each of the terminal insertion holes 9, and the pin terminal 11 is inserted.
P, 11p', 11s, 11s' are inserted into the communication holes 2a to 2d of the laminated coil through the terminal insertion hole 9.
Thereafter, the open end surface of the pot-shaped core 6 is brought into contact with the open end surface of the pot-shaped core 5 to form a magnetic circuit.

Pin terminals 11p and 11p' are primary coil terminals. As shown in FIG. 6, the pin terminal 11p does not touch the conductor 4 of the sheet coil B stacked below, but only connects to the communication hole of the conductor coating through hole 2a, which is the outer edge of the conductor 3 of the sheet coil A. electrically connected. The pin terminal 11p' is connected to a communicating hole of the conductor covering through hole 2b which is the inner edge of the conductor 3 of the sheet coil A. In addition, the pin terminal 11s
and 11s' are inserted until they come into contact with the insulating plate 10, but it will be easily understood that there is no need to illustrate or explain that they are connected only to the conductor 4 of the sheet coil B.

In this way, a thin transformer with a constant voltage ratio can be easily made without winding work.
In addition, although the case where the number of sheet coils A and B are three and two, respectively, was shown in the above embodiment, it goes without saying that the number of laminated sheet coils can be increased or decreased depending on the magnitude of current capacity.

[Effects of the Invention] As explained above, the present invention has the effect that a thin transformer can be easily manufactured without winding work.

[Brief explanation of the drawing]

Figures 1 and 2 are plan views showing examples of sheet coil units used in the present invention, Figure 3 is a front sectional view of a pair of pot-shaped cores used in the present invention, and Figure 4 is one of the sheet coil units in Figure 3. FIG. 5 is a partially cutaway front view showing an embodiment of the transformer according to the present invention, and FIG. 6 is an enlarged sectional view of the main part of FIG. 1 is an annular insulating sheet, 2a and 2b are conductor coating through holes, 2c and 2d are through holes, 3 and 4 are spiral conductors, 5 and 6 are pot-shaped cores, 7 is an annular recess,
8 is an insulating member, 9 is a terminal insertion hole, 10 is an insulating plate,
11p, 11p', 11s and 11s' are pin terminals.

Claims (1)

[Scope of utility model registration request] It has first and second sheet coils, and a pair of pot-shaped cores that are combined with each other to form a sheet coil storage space that can store at least one of the first and second sheet coils, Each of the first and second sheet coils has two inner through holes and two outer through holes formed in the annular insulating sheet, and one of the inner through holes and one of the outer through holes. The inner surface is coated with a conductor, and a spiral conductor having a different number of turns is formed on one side of the insulating sheet with the two conductor coating through holes as starting and ending points, and the pair of pot-shaped cores each has an annular recess for forming the sheet coil storage space, and the bottom of one of the pair of pot-shaped cores has four terminal insertion holes corresponding to the four through holes of the sheet coil. An insulating member having a hole is fitted, and at least one of the first and second sheet coils does not communicate with each other through the conductor coating through hole of one of the sheet coils. The first and second sheet coils are stacked so as to communicate with the conductor-uncovered through hole of the other sheet coil, and are housed in the annular sheet coil storage space formed by the pair of pot-shaped cores. A transformer characterized in that four pin terminals are inserted into four through holes of a sheet coil, and one end of each pin terminal is exposed to the outside of the pot-shaped core.