JP2573329Y2 - Trance - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a transformer, and more particularly to a current transformer which requires a large transformation ratio between primary and secondary, and a surface-mounted transformer for high / low voltage conversion.

[Conventional technology]

For conventional surface mount transformers that require a very large transformation ratio, winding is performed using a copper plate or shield material with a lead wire for drawing out connected to the winding side with a small number of turns, The other end of the lead wire is connected to a surface mounting terminal.

[Problems to be solved by the invention]

In the above-mentioned conventional surface mount transformer, the copper plate used for winding and the mounting terminal are connected using lead wires,
In addition to the need for soldering work at four locations, the copper plate is wound around the bobbin while being manually formed, so the lengths of the copper plates used are not uniform, and individual differences occur in the lead extraction positions. There is a problem that work is difficult.

The primary side of a current transformer mainly used as a current sensor in a power supply circuit, and the transformer
Secondary side or transformer of high voltage input low voltage generator 2
The secondary winding is often wound once, but has the disadvantage that the operation of winding a copper plate on the bobbin is difficult as described above.

[Means for solving the problem]

The transformer according to the present invention has a winding portion and a surface mounting terminal formed integrally from a plate-shaped conductor by press molding, and the winding portion is arranged inside and the surface mounting terminal is arranged outside to insulate. And a bobbin molded from resin.

〔Example〕

 Next, the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing a completed embodiment of the present invention, and FIGS. 2 (a) to 2 (d) are perspective views showing a step of pressing a mold internal winding and a terminal portion in a mold spool of the embodiment. 3 (a) to 3 (c) are perspective views showing a molding step of the present embodiment, FIG. 4 is a perspective view of a core in the present embodiment,
FIG. 5 is a connection diagram when the present embodiment is used in a current transformer.

This embodiment is a copper plate winding body part 1a press-formed from a copper plate.
Is wound using a wire 7 on a bobbin (winding frame portion 3) having the inside. Copper-plated terminals that are also press-molded together
The winding of the copper plate inside the bobbin with 1b as the surface mount terminal is 1
Since the wire is wound, a wire is wound around the bobbin so as to have a desired number of turns, and the end of the wire is pulled out from the winding end drawer 5 and connected to the mounting terminal 2 for the wire.

When the transformer of this embodiment is used as a current transformer, two (or one) of the four surface-mounting terminals indicated by 1b out of four surface-mounting terminals integrally formed with a copper plate winding (FIG. 5).
Is connected to the primary side of the power supply circuit (between the input terminal of the main transformer and the power supply line) with the other two (or one) at the end of winding, and the two mounting terminals 2 (FIG. 5). 9) is connected to an overcurrent detection circuit and the like (see FIG. 5).

The procedure for forming the copper plate winding inside the bobbin is shown in FIGS.
As shown in (d), cutting and pressing are performed. The molding procedure of the mold and the surface mounting terminal is shown in FIGS. 3 (a) to 3 (c). When molding the molded product of FIG. 2 (d), the surface mounting terminal for wire connection is used. Are mounted as shown in FIG. 3A and molding is performed. The core 6 as shown in FIG. 4 is assembled into the completed mold bobbin (FIG. 3 (c)) to obtain a completed transformer shown in FIG.

Generally, a large current flows on the primary side of a current transformer and a high voltage generating circuit. However, this embodiment has a primary winding formed by press-molding a copper plate, so that the effective area of the conductor can be increased and the transformer can be increased. Can be reduced in height.

[Effect of the invention]

As described above, according to the present invention, a surface mounting terminal and a winding portion are integrally press-molded from a plate-shaped conductor, and the resultant is molded with an insulating resin. Compared with the method of applying wires, the complexity of entanglement and soldering is reduced, workability is improved, quality is uniform, and total cost is reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of a completed embodiment of the present invention, and FIGS. 2 (a) to 2 (d) show a process of pressing a mold internal winding and a terminal used in a mold spool of the embodiment. 3 (a) to 3 (c) are perspective views showing a molding process of the present embodiment, FIG. 4 is a perspective view of a core in the present embodiment, and FIG. 5 is a current transformer using the present embodiment. It is a connection diagram at the time of using. 1a: copper-plate winding body part, 1b: copper-plate mounting terminal part, 2: wire wire entanglement and mounting terminal, 3: winding frame part, 4: core insertion hole, 5: winding terminal drawer Part, 6 ... core, 7 ...
... winding (wire material), 8 ... primary winding (copper sheet winding), 9 ...
Secondary winding (wire winding).

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) H04F 27/00-27/42

Claims (2)

(57) [Scope of request for utility model registration] 1. A plate-shaped surface mounting terminal formed by integral press molding of a plate-shaped conductor, and a plate winding portion having a surface parallel to the plate-shaped surface of the surface mounting terminal; A bobbin molded with an insulating resin with the winding portion disposed inside and the surface mounting terminal disposed outside, and a side surface of a coil composed of a secondary winding wound with a wire, wherein And a wire winding portion disposed so as to face the parallel surface of the portion. 2. A flat plate winding portion formed by folding a plate-shaped conductor into a rectangle, and bending the center of both ends of the rectangle by 90 degrees into the inside of the rectangle; A surface mounting terminal formed by bending 90 degrees outward is integrally formed, and the flat winding portion is disposed inside and the surface mounting terminal is disposed outside and molded with an insulating resin to form a hobbin, A transformer, wherein a secondary winding is formed by winding a wire at a position covering the entire outer peripheral surface of the flat coil portion.