JPH0864411A - Coil bobbin - Google Patents

Abstract

PURPOSE: To provide a coil bobbin for a transformer which can ensure enough insulation distance. CONSTITUTION: A projecting extension part 20 is provided to both ends of a lower brim 3 of a coil bobbin consisting of a tubular core 14, an upper brim 2 and the lower brim 3 at right angles to a lower groove 19. The lower brim 3 is formed to an H-shape, a projection 17 for guiding a coil end and pin terminals 4a, 4b, 4c, 4d are provided to the extension part 20 and the coil end is hung on an outside of the projection 17 to be entwined with the pin terminals 4a, 4b, 4c, 4d.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil bobbin for a power transformer used in various video equipment, audio equipment, industrial equipment, telephone-related equipment and the like.

[0002]

2. Description of the Related Art Recent advances in electronic technology have been remarkable. Above all, electronic devices that use transformers,
For example, in a multifunctional telephone device, a DC-DC converter, etc., the transformer itself is required to be miniaturized, and high performance, high safety and reliability are required.

FIG. 2 is a diagram showing a transformer coil bobbin and a transformer. 2A is a perspective view of the coil bobbin, FIG. 2B is a bottom view of the transformer, and FIG. 2C is a perspective view of the transformer.

In the conventional transformer, as shown in FIG. 2 (a), the coil bobbin has a substantially quadrangular upper flange 2 and a lower flange extending outwardly at both ends of a cylindrical winding core 14 made of an electrically insulating material. The one provided with 3 is used. The upper collar 2 has an upper groove 18 for mounting a core, and has a hole at the center which constitutes a part of a center hole 16 into which a magnetic leg of the core is inserted. On the other hand, the lower flange 3 is provided with a plurality of pin terminals 4i, 4j, 4k, along the substantially quadrilateral facing sides, as shown in FIG.
4l, 4m, 4n, 4o and 4p are planted in the pores from the outer surface.

As shown in FIG. 2C, the transformer coil is formed by a winding wire 6 shown by a chain line on the winding core. In FIG. 2 (b), the end of the lead wire of the winding wire 6 is wound around the winding core, then entangled in the pin terminals 4l and 4m, and then soldered.

Next, the magnetic leg at the center of the E-shaped core 7 is attached to the core 1.
The E-shaped (or I-shaped) core 8 forming a pair is abutted on the opposite side through the center hole 16 of the No. 4 and mounted.

After that, as shown in FIG. 2 (c), a core fixing tape is wound around the surfaces of both cores 7 and 8 to bring the pair of cores 7 and 8 into close contact, and the assembly of the transformer is completed.

The mounting on the board is performed by inserting pin terminals used for fixing into the mounting holes on the board and soldering.

[0009]

In the conventional transformer, as shown in FIG. 2B, one end of the winding wound around the winding core 14 is drawn out from the drawing groove 15 of the lower flange 3. ,
The other end is entwined with the pin terminal 4m, and the other end is also entwined from the lead-out groove 15 and entangled with the pin terminal 4l and soldered. At that time, it is desired to secure a sufficient creepage distance from the winding and the core to the pin terminal, but there is a drawback that the creepage distance is small and it is difficult to secure a sufficient creepage distance as shown in FIG.

It is an object of the present invention to provide a transformer coil bobbin capable of sufficiently securing the creepage distance.

[0011]

According to the present invention, a collar having a groove for setting a quadrilateral core is formed at both ends of a cylindrical winding core made of an insulating material, and two collars of one collar facing each other are formed. In a coil bobbin for a transformer in which two rows of pin terminals connected to a winding are planted in a peripheral portion, a projecting extension portion is provided at both ends of the one flange so as to be orthogonal to the lower groove, and an H-shape is formed. A coil bobbin having a shape and having a structure in which at least one protrusion for guiding a winding terminal and a pin terminal are provided in the extended portion can be obtained.

[0012]

In the conventional coil bobbin for transformer, the creeping distance cannot be sufficiently secured. Therefore, the lower flange is provided with the projecting extension portions at both ends thereof so as to secure the sufficient creeping distance.
Therefore, the lower brim, which has conventionally been a quadrilateral, has an H shape. The extended portion is provided so as to be orthogonal to the lower groove of the lower collar,
It stands out. In this coil bobbin, a protrusion is provided on the outside of the extending portion of the lower collar so that the end of the winding can be hooked, and the winding end is hooked on the protrusion to twist the pin terminal. When the winding ends are processed in this way, the extended portion is lengthened, so that a sufficient creeping distance can be secured.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the coil bobbin of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing a transformer coil bobbin and a transformer of the present invention. FIG. 1A is a perspective view of the coil bobbin, and FIG. 1B is a bottom view of the transformer.

The transformer coil bobbin of the present invention is shown in FIG.
As shown in FIG. 3, it is composed of a cylindrical winding core 14 and upper and lower flanges 2 and 3 provided at both ends thereof. An upper groove 18 is provided on the outer surface of the upper collar 2 to facilitate mounting of the E-shaped core. Further, a central hole 16 is provided integrally with the cylindrical winding core 14 for mounting the magnetic leg at the center of the E-shaped core.

Further, a lower groove 19 wider than the width of the core is formed in the lower collar 3 so that the E-shaped core can be easily fitted therein.
It is provided symmetrically. Furthermore, in lower tsuba 3,
Pin terminals 4e, 4f, 4g, and 4h are provided on the opposite side surfaces where the lower groove 19 is not provided.
A lead-out groove 15 for pulling out the winding end is formed between e and 4f and between the pin terminals 4g and 4h. Next, lower groove 1
The extending portions 20 are provided so as to be orthogonal to the lower collar 3 so as to project outward from the four corners so that the lower collar 3 has an H-shape.

Pin terminals 4a, 4b, 4c and 4d are attached to four extending portions 20 of the lower flange 3 toward the board attachment surface. Further, protrusions 17 are provided so as to project outward at four locations on the opposite side surfaces where the lower groove 19 of the lower collar 3 is provided.

FIG. 1 (b) shows a transformer using the coil bobbin of the present invention as seen from the bottom. FIG.
In the transformer of (b), the coil bobbin 13 is wound,
A state in which the E-shaped core 7 is mounted is shown, and winding ends are entwined with the pin terminals 4b and 4c. More specifically, one end of the winding wound around the winding core of the coil bobbin is hooked on the protrusion 17 from above and the pin terminal 4
The other end is hooked on the protrusion 17 located on the opposite line, and the other end is hooked on the pin terminal 4b.
After that, an insulating tape is wound around the winding portion for insulation.

Further, as shown in FIG. 1 (b), the central magnetic leg of the E-shaped core 7 is inserted into the center hole of the winding core, the E-shaped cores are abutted from the opposite side, and then the cores are placed on the cores. Wrap the tape from. In FIG. 1B, the diagonal lines of the core 7 indicate the magnetic legs of the core.

The creepage distance in FIG. 1 (b) is the distance from the primary coil wound around the winding core of the coil bobbin to the pin terminal having the end of the winding of the secondary coil. As can be seen from FIG. 1B, the creeping distance of the coil bobbin of the present invention is sufficiently secured as compared with the creeping distance of the conventional coil bobbin of FIG. 2B.

The above processing is performed to complete the transformer.

[0022]

With the coil bobbin structure as described above, a sufficient insulation distance can be secured in the coil bobbin of the present invention, so that a highly reliable and stable transformer can be provided.

[Brief description of drawings]

FIG. 1 is a view showing a coil bobbin for a transformer and a transformer of the present invention. FIG. 1A is a perspective view of a coil bobbin. FIG.
(B) is a bottom view of the transformer.

FIG. 2 is a diagram showing a conventional transformer coil bobbin and a transformer. FIG. 2A is a perspective view of the coil bobbin. Figure 2
(B) is a bottom view of the transformer. FIG. 2C is a perspective view of the transformer.

[Explanation of symbols]

1 transformer 2 upper flange 3 lower flange 4a, 4b, 4c, 4d, 4e, 4f, 4g, 4h
Pin terminals 4i, 4j, 4k, 4l, 4n, 4m, 4o, 4p
Pin terminal 5 Tape 6 Winding 7, 8 Core 9 Fixing metal fitting 10 Arrow 11 Board 12 Screw 13 Coil bobbin 14 Winding core 15 Drawing groove 16 Center hole 17 Protrusion 18 Upper groove 19 Lower groove 20 Extended part 22 Dashed line

Claims (1)

[Claims] 1. A two-row structure in which a flange having grooves for installing a quadrilateral core is formed at both ends of a cylindrical winding core made of an insulating material, and the winding is connected to two opposing peripheral portions of one flange. In the coil bobbin for the transformer, which has the pin terminals of
Protruding extension portions are provided at both ends of the one flange so as to be orthogonal to the groove to form an H-shape, and at least one protrusion and a pin terminal for guiding a winding terminal are provided in the extension portions. A coil bobbin characterized by being provided.