JPH0142323Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a transformer.

Conventionally, a transformer using an EE type magnetic core as shown in FIG. 1 has been used as an impedance conversion transformer or a power transformer for a switching regulator. This conventional transformer consists of a spool 2 provided with a terminal 1 and an EE type magnetic core 3, and the lead wire of the winding wound around the spool 2 is connected to the terminal 1.

In a transformer with this type of structure, the windings at the top of the transformer are exposed from the magnetic core, so there is a lot of leakage magnetic flux.
This has the disadvantage that the high frequency characteristics of the transformer deteriorate, and in particular, in power transformers, electromagnetic radiation noise to the outside of the transformer is large.

The object of the invention is to provide a transformer which eliminates the above-mentioned drawbacks and which can be made smaller.

The transformer of the present invention has a cylindrical part on the outer circumferential surface of which a winding is wound and a hollow interior, and two collar parts provided at both ends of the cylindrical part each having a notch reaching the cylindrical part. and a winding frame formed from a winding pull-out pleat extending from the notch and a plurality of terminals respectively provided at the lower ends of the two flanges, and a winding wound around the cylindrical part, respectively. has a cylindrical part that fits with the cylindrical part and a winding pull-out groove that engages with the pleat part, and has an inner periphery concentrically with the cylindrical part so as to cover the upper and side parts of the winding frame. 2 with a concave outer shape and a ring portion formed therein.
a magnetic core made up of two members, and a spring for fixing the two members to the winding frame; the ring part has a cross-sectional area larger than the cylindrical part; A transformer characterized in that the width of the transformer is formed to be 1/2 or less of the outer width of the magnetic core.

Next, the present invention will be explained in detail with reference to the drawings.

Fig. 2 is a perspective view showing one embodiment of the present invention;
The figure is an exploded perspective view of FIG. 2, and FIGS. 4a and 4b are cross-sectional views of FIGS. 1 and 2, respectively.

This embodiment includes a cylindrical part 15 having a hollow interior around which the winding 14 is wound, and two collar parts each having a notch provided at both ends of the cylindrical part 15 and reaching the cylindrical part 15. 7, a winding drawer fold part 11 extending from the notch, and a plurality of terminals 8 provided at the lower ends of the two collar parts 7, respectively; Line 14 and
Each has a cylindrical part (referred to as a slug) 6 that fits into a cylindrical part 15 and a U-shaped winding pull-out part 10 that engages with a pleat part 7, and covers the upper and side parts of the winding frame 9. 2 whose inner surface has a ring portion 5 formed concentrically with the slug 6 and whose outer shape is concave.
It consists of a magnetic core 4 consisting of two members 4' and 4'', and a spring 13 for fixing the two members 4' and 4'' to the winding frame 9. It is formed large so that the width of the winding lead-out portion 10 is 1/2 of the external width of the magnetic core 4.

In this way, in this embodiment, the exposed portion of the winding 14 is small, and the cross-sectional area of the ring portion 5 of the magnetic core 4 is smaller than that of the slug 6.
Since the magnetic core 4 itself has a magnetic shielding effect since it is larger than the cross-sectional area, electromagnetic noise can be reduced. Furthermore, by pulling out some of the lead wires 12 from the upper U-shaped winding lead-out groove 10, it is possible to wind a larger number of windings than the number of terminals 8 implanted in the winding frame 9.
Even thick wires that cannot be wired around terminal 8 can be wound. Furthermore, compared to the EE type magnetic core, it has good high frequency characteristics due to less leakage magnetic flux, and as shown in Figure 4a, there is no wasted part 15 that has not been utilized in the past, so the transformer with the same power can be made smaller. can be converted into

Note that the shapes of the notches and folds in the magnetic core are free, and the transformer of the present invention may be placed in a metal case.

As described above, the present invention has the effect of improving the high frequency characteristics of the transformer and reducing its size.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of a conventional transformer, Fig. 2 is a perspective view showing an embodiment of the present invention, Fig. 3 is an exploded perspective view of an embodiment of the invention, and Fig. 4 a and b are They are sectional views of a conventional example and an example, respectively. In the figure, 1, 8... terminal, 2, 9... winding frame, 3, 4... magnetic core, 5... ring part, 6... slug, 7... collar part, 10... winding pull-out groove, 11
...Fold part, 12... Output line, 13... Spring, 1
4... Winding wire, 15... Cylindrical part.

Claims (1)

[Scope of utility model registration request] A cylindrical part with a winding wound around the outer circumferential surface and a hollow interior, two collar parts provided at both ends of the cylindrical part each having a notch reaching the cylindrical part, and protruding from the notch. A winding frame formed of a winding drawer pleat and a plurality of terminals respectively provided at the lower ends of the two brim, a winding wound around the cylindrical part, each of which fits into the cylindrical part. a ring part having a cylindrical part that fits together and a winding pull-out groove that engages with the pleat part, and whose inner periphery is formed concentrically with the cylindrical part so as to cover the upper and side parts of the winding frame; It is composed of a pair of magnetic cores and a spring for fixing the pair of magnetic cores to the winding frame, and the ring part has a cross-sectional area larger than the cylindrical part, and the width of the winding lead-out groove is formed so that it is 1/2 or less of the external width of the magnetic core, and some of the windings are connected to the terminals of the winding frame, and other windings are formed in opposite directions from the winding pull-out pleats. A transformer characterized by being drawn out.