JPH01212414A - Transformer - Google Patents

Abstract

PURPOSE:To unnecessitate a pin terminal or a tabular terminal by a method wherein an electrode terminal is formed in the case to be used for the structure of insulation, outer covering and internal protection. CONSTITUTION:Urethane-covered copper wires 14 and 14 are wound around a spool 15, the wires 14 are cut at the end parts 13a-13j in the length which comes in contact with the upper surface of cases 11a and 11b, they are solder- dipped, and the urethane covering is removed. Ferrite magnetic cores 16a and 16b are combined to the spool 15, the highly heat-proof resin cases 11a and 11b having adhered copper foils 12a-12j, which become an electrode terminal, are combined and the two cases 11a and 11b are adhered with a bonding agent 17. Then, the urethane covering-removed copper wire end parts 13a-13j are soldered to the electrode terminals 12a-12j. As the cases on which electrode terminals are molded as above-mentioned are used, the terminal or the tabular terminal heretofore in use are unnecessitated.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a transformer used for power or signal transmission in various electronic devices, particularly in high-density packaging electronic devices.

Conventional technology A conventional technique will be explained with reference to the drawings.

FIGS. 4 and 6 are examples of prior art using terminal bins. The terminal pins 41L, 4b, and 40 are implanted, and the urethane-coated copper wire 3 is wound around the winding frame of the terminal plate 2, which is formed integrally with the winding frame, and the copper wire end 6! Pass the wires L, 6b, 60 through the wiring grooves 71L, 7b of the terminal board 2, and connect the terminal pins 4&, 4b,
Cut to 4C. The terminal pins 41L, 4b, 40 and the barbed portions at, sb, sc are electrically connected by solder dip, and the ferrite magnetic cores 1&, 1b are combined and fixed with adhesive 8. In order to improve the electrical characteristics, a square-wound copper wire-wound insulating tape is installed, a case is installed to cover the entire transformer, and a filler is injected into the gap between the transformer and the case to increase the dielectric strength.

In the examples shown in Figures 4 and 6, if the urethane-coated copper wire 3 is sufficiently thick, the terminal pins 41L, 4b, and 40 are not installed, and the conductor ends 61L, (5b, 45g) are pulled out of the transformer from the winding frame. , the end is sometimes used as a terminal pin by dipping the end.

FIGS. 6 and 7 are examples of prior art transformers for flow soldering elbows that use plate-shaped terminals. Plate terminals 4a, ab,
The urethane-coated steel wire 3 is wound around the winding frame of the terminal plate 2, which has an integrally molded winding frame, and the copper wire ends 61L, tsb
, ea through the wiring grooves 7a and 7b of the terminal board, and connect the plate terminal 4.
Cut to N, 4b, 40. Terminal bin 4&, 4b
, 40 and the tangled portion 6 are electrically connected with a solder dip, the ferrite magnetic cores 1a and 1b are combined, and an adhesive 8 is applied.
It sticks to the surface. In order to improve solder heat resistance when mounting a circuit board, a portion of the plate terminal may be exposed outside and the entire terminal may be molded with resin.

Problems to be Solved by the Invention In the prior art, bottle terminals or plate-shaped terminals 41L to 4C are used, and electrical connections are made by tying the end of the covered conductor to the terminal and soldering the tangled portion to the terminal. . Therefore, the problem was that the shape became unstable due to the terminal being erected, and the shape became larger.

Means to solve problems In order to solve the above problems, the present invention uses insulation.

By using a case in which electrode terminals are formed on a case used as an exterior and internal protection structure, bottle terminals or plate-shaped terminals are unnecessary.

The working covered conductor is wound around a winding frame, and the end of the covered conductor is cut to a length that contacts the electrode terminal surface of the case.In order to electrically connect the covered conductor to the electrode terminal, only the part that contacts the covered conductor and the electrode terminal is coated. Peel it off, then combine the magnetic core made of magnetic material,
Furthermore, a case with electrode terminals formed on the surface is combined,
The ends of the conductive wires with the sheath removed are electrically connected to part of the electrode terminals of the case to form a transformer. By electrically connecting a portion of the case electrode terminals of the transformer with this configuration to the circuit board, the transformer functions as a transformer. As described above, by using the case in which the electrode terminal is molded, the conventional pin terminal or plate terminal can be made unnecessary.

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

1 to 3 show an embodiment of the present invention, particularly a transformer for reflow soldering elbows.

The urethane-coated copper wire 14 is wound around the winding frame 16, and the copper wire end 1
SIL, 13b, 130, 1311, 13el.

13f, 13g, 13h, 13i, and 13j are cut to a length that contacts the top surface of the case, dipped in solder, and the urethane coating is removed. Ferrite magnetic core 16&.

16b to the winding frame 16, and the copper foil 1 that becomes the electrode terminal.
2&, 12b, 120.12 (1,126°12f, 1
2g, 12h, 12i, and 12j are bonded together into high heat-resistant resin cases 111L and 11b, and the two cases are fixed together using adhesive 17.

Thereafter, the urethane coating was removed from the copper wire end 13a.

13b, 130.13 (1,13+5.13f, 13
g.

13h, 13i, and 13j are electrode terminals 121L and 12b.

120.12 (1,120, 12f, 12g, 12h.

Solder to 121.12j. Then, in order to improve the heat resistance of the solder when attaching the circuit board, a heat-resistant botting resin is applied and cured on the upper surface of the transformer to the extent that it covers part or all of the coil winding surface, copper wire ends, and electrode terminal joints. Note that this resin-coated part is not shown in the drawing to make the structure easier to understand. The entire coil winding portion is also covered on the lower surface of the main transformer, and heat-resistant botting resin is applied and cured to such an extent that it does not bulge from the lower surface of the high-heat-resistant resin cases 111L and 11b. Note that this resin-coated part is not shown in the drawing to make the structure easier to understand. Further, a conceptual structural diagram of this embodiment is shown in FIG. The present transformer is configured as described above.

This transformer is reflow soldered so that the electrode surface of the circuit board and the bottom surface of the transformer are in contact. As shown in FIG. 1, the electrode terminals 121L to 12j extend from the lower surface to the upper surface of the transformer and form a highly heat-resistant resin case 111L.

11b is subjected to adhesive processing, and the terminal electrodes 12L to 12 on the upper surface are
The ends of the copper wires are soldered and connected to the windings of the wires via this route.

This embodiment is just one example, and the coated conductor may be an enamel-coated copper wire, a resin-coated aluminum wire, or a stranded wire made of multiple conductors. Further, as a method for removing the conductor coating, a method of melting the coating with higher heat than laser irradiation, a method of scraping it off with a polisher, or a knife may be used. The magnetic core may be a non-magnetic material such as iron or alumina, and the shape may be XI type, uI type, 0-hole type, or I type. Alternatively, it may be made of laminated thin plates. The electrode terminal may be made of metal or alloy and may be electrically conductive. The electrode terminal may be formed on the case by vapor deposition, fitting, or the same method.

Further, the number of electrode terminals may be two or more. The case may be divided into one or more parts, and the method of combining them may be by fitting them together.

Effects of the Invention According to the present invention, the factor of unstable shape due to terminal curling is removed, making it possible to improve reliability, and since there is no need to build up the terminal board to ensure terminal strength, it is possible to reduce the size and weight. This makes it possible to supply products that meet the needs of the times.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of the transformer of the present invention, Fig. 2 is a sectional view thereof, Fig. 3 is a conceptual diagram of the same structure, Fig. 4 is a perspective view of conventional example 1, and Fig. 6 is a conventional example. FIG. 6 is a sectional view of Example 1, FIG. 6 is a perspective view of Conventional Example 2, and FIG. 7 is a sectional view of Conventional Example 2. 111L, 11b... High heat resistant resin case, 12
a. 12b, 120.12 (1,1215, 12f, 12g
. 12h, 12i, 12j...Copper foil electrode terminal, 1
31L. 13b, 130.13 (1,136, 13f, 13g. 13h, 13i, 13j... copper wire end, 14.
... Urethane coated copper wire, 16 ... Winding frame,
16a, 18b. ......Ferrite magnetic core, 17...Adhesive. Name of agent: Patent attorney Toshio Nakao and 1 other person! Ozuka

Claims (1)

[Claims] A coil made of a conductor wound around a winding frame and a magnetic core made of a magnetic material are combined to form an electrode terminal in a case used as a structure for insulation, exterior protection, and internal protection, and the end of the conductor is electrically connected to this electrode terminal. Spliced transformer.