JPS6357928B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transformer comprising a magnetic core such as EE, EI, UI, etc., and a coil wound around a bobbin.

First, a conventional transformer will be explained with reference to drawings.

FIG. 1a is a perspective view of the magnetic core of a conventional transformer, and FIG. 1b is a sectional view taken along line AA of the same transformer.

As shown in the figure, the magnetic core 1 includes a fixing part 3 with coupling parts 2a and 2b vertically protruding from both ends thereof, and a coupling part 2a, 2b in the center of the fixing part 3.
2b and a cylindrical core portion 4 protruding in the same direction, and has an E-shape. The protruding surface of the core portion 4 of the fixing portion 3 is a flat surface.

Usually, a transformer has a magnetic core 1 and a magnetic core 2 of the same shape.
They are used in combination so that the tips of the connecting portions 2a, 2b and the tip of the core portion 4 are in contact with each other.

FIG. 2a is a perspective view of a bobbin used in a conventional transformer, and FIG. 3 is a front view of the bobbin.

In the figure, the bobbin 5 has a fixing groove 7 between two rectangular parallelepiped bases 6a and 6b arranged in parallel. A plate-shaped connecting part 8b having a hole 8a in the center is provided at the upper part of the fixing groove 7 between the base parts 6a and 6b. A cylindrical winding portion 9b is provided around the opening of the hole 8a of the connecting portion 8b, and is fixed perpendicularly to the connecting portion 8b and has a hole 9a having the same diameter as the hole 8a. Above the winding part 9b, there is a hole 10 having the same diameter as the hole 9a in the center so as to be parallel to the connecting part 8b.
A disk-shaped upper plate portion 10b provided with a is fixed.

Figure 3a is a perspective view of a conventional transformer, Figure 3b
is a cross-sectional view of the same transformer taken at a position slightly shifted from the center.

In the figure, 11 and 12 are magnetic cores having the same shape as the magnetic core 1 in FIG.
3b, a fixed part 14, and a core part 15, the magnetic core 1
2 has connecting parts 16a and 16b, a fixing part 17, and a core part 18.

The core portion 15 of the magnetic core 11 is connected to the winding portion 9 of the bobbin 5.
The magnetic core 11 is inserted into the hole 9a from below, and the fixing portion 14 of the magnetic core 11 is fitted into the fixing groove 7 of the bobbin 5. The core portion 18 of the magnetic core 12 is inserted into the hole 9a of the bobbin 5 from above, and the connecting portions 16a, 16b of the magnetic core 12 and the tip of the core portion 18 are connected to the connecting portion 13 of the magnetic core 11.
a, 13b and the tip of the core portion 15 are positioned so as to come into contact with each other. A primary coil 19 is first wound around the winding portion 9b of the bobbin 5, and the lead wires 20 at both ends of the primary coil 19 are connected to two wires provided on the lower surface of the base portion 6a of the bobbin 5. Primary terminal 21
connected to. An insulating paper 22 is wound on the outer surface of the primary coil 19, a secondary coil 23 is wound on the outer surface of the insulating paper 22, and the lead wires 24 at both ends of the secondary coil 23 are connected to the base of the bobbin 5. It is connected to two secondary terminals 25 provided on the lower surface of 6b.

However, in a transformer with such a configuration, the primary coil 19, the secondary coil 23, and the lead wire 2
0, 24 are in direct contact with the primary coil 19,
It was necessary to affix an insulating paper 26 between the secondary coil 23 and the lead wires 20 and 24 to prevent layer shorting and voltage resistance failure.

In view of the above drawbacks, the present invention provides a transformer in which the lead wire and the coil can be easily insulated.

In order to achieve the above object, the present invention provides a taper or a step so that the center axis of the surface of the fixing part of the magnetic core in contact with the bobbin is high and the end is low, and the fixing part of the magnetic core is provided at the connection part and upper plate part of the bobbin. A groove of the same shape as the surface of the base is provided, a protrusion is provided on the top surface of the base in a cross shape around the step on the top surface of the connection part and the winding part, and a recess is provided between the cross-shaped protrusions. The lead wire is passed through the coil, and the coil is configured so that the lead wire does not come into contact with the coil.

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

FIG. 4a is a perspective view of a magnetic core of a transformer according to an embodiment of the present invention, and FIG. 4b is a sectional view taken along line BB of the same.

In the figure, 27 is the fixed part 3 of the magnetic core 1 in FIG.
The upper surface of the magnetic core is tapered so that it is high on the central axis in the longitudinal direction and low on both ends. magnetic core 27
The shape of the fixing portion 28 may be such that it is high on the central axis and low at both ends, as shown in FIGS. 4c to 4f.

FIG. 5a is a perspective view of a bobbin of a transformer according to an embodiment of the present invention, and FIG. 5b is a front view thereof.

In the figure, the bobbin 29 has a protrusion 3 on the upper center surface.
Two rectangular parallelepiped bases 31 having 0a and 30b
a, 31b and the base portions 31a and 31b, a plate-shaped connecting portion 32 having the same shape as the taper of the fixed portion 28 of the magnetic core 27 is provided, and the base portions 31a, 31b are connected to each other.
and the connecting portion 32 form a groove 33. A cylindrical winding portion 35 having a hole 34 is fixed to the center of the upper surface of the connecting portion 32 . At the upper end of the winding part 35, two holding protrusions 3 are formed directly above the groove 33 so that a groove 36 having the same shape as the groove 33 faces upward.
Disk-shaped upper plate part 38 with 7a and 37b provided in parallel
is installed. The hole 34 passes through the connecting portion 32 and the upper plate portion 38.

FIG. 6a is a perspective view of a transformer according to an embodiment of the present invention, and FIG. 6b is a sectional view of the transformer taken at a position slightly offset from the center.

In the figure, 39 and 40 are magnetic cores having the same shape as the magnetic core 27 in FIG.
a, 41b, a fixing part 42, and a core part 43,
The magnetic core 40 has connecting parts 44a and 44b, a fixed part 45, and a core part 46. Core part 4 of magnetic core 39
3 is inserted into the hole 34 of the bobbin 29 from below, the core part 45 of the magnetic core 39 is inserted into the hole 34 from above, and the fixing parts 42, 45 of the magnetic cores 39, 40 fit into the grooves 33, 36 of the bobbin 29.

A primary coil 47 and a secondary coil 48 are wound around the bobbin 29 with an insulating paper 49 sandwiched therebetween, similar to the transformers shown in FIGS. 3a and 3b. But bobbin 2
The protruding portion 3 provided on the base portions 31a and 31b of 9.
0a, 30b and the taper of the connecting portion 32, the primary coil 47, the secondary coil 48 and the base portions 31a, 31 of the bobbin 29
Four recessed portions 50 are provided between the two portions and b. In particular, since the connecting portion 32 is tapered,
A recess 50 also extends between the center of the primary coil 47 and the connecting portion 32. As a result, the two lead wires 51 of the primary coil 47 and the secondary coil 4
The two lead wires 52 of No. 8 are passed through the recess 50 and connected to the terminals 53 on the lower surfaces of the bases 31a and 31b, so the lead wires 51 and 52 are connected to the primary coil 47 and the secondary coil 48. are no longer in direct contact with each other. Therefore, insulating paper is no longer necessary, and it is possible to reduce material costs and man-hours during manufacturing, and it is possible to provide a transformer that can prevent layer shorting and voltage resistance defects.

Also, the fixing portion 4 of the magnetic cores 39 and 40 is attached to the bobbin 29.
By providing the grooves 33, 36 having the same shape as the tapers 2, 45, the positioning of the magnetic cores 39, 40 becomes easy and accurate, and a transformer with less magnetic flux leakage can be provided.

As described above, the present invention provides a groove having the same shape as the taper or step provided in the fixed part of the magnetic core, and a groove having the same shape as the fixed part of the magnetic core in the connecting part of the bobbin provided between the base part and the upper plate part. By providing a taper or step and providing a cross-shaped protrusion along with the taper or step on the base, there is no need for insulating paper to insulate the lead wire from the coil, and magnetic flux leakage can be reduced. can.

[Brief explanation of the drawing]

Fig. 1a is a perspective view of the magnetic core of a conventional transformer, Fig. 1b is a sectional view taken along line A-A of the same magnetic core, Fig. 2a is a perspective view of the bobbin of a conventional transformer, and Fig. 2b is a perspective view of the bobbin. 3(a) is a perspective view of a conventional transformer, FIG. 3(b) is a sectional view thereof, FIG. 4(a) is a perspective view of a magnetic core of a transformer according to an embodiment of the present invention, and FIG. 4(b) is a perspective view of the same magnetic core. FIGS. 4c to 4f are sectional views showing other examples of the magnetic core, FIG. 5a is a perspective view of a transformer according to an embodiment of the present invention, and FIG. 5b is a front view of the transformer. , 6th
FIG. 6a is a perspective view of a transformer according to an embodiment of the present invention, and FIG. 6b is a sectional view thereof. 29... bobbin, 30a, 30b... protrusion,
31a, 31b...stand part, 32...connection part, 3
3, 36...groove, 34...hole, 35...winding part,
37a, 37b...Holding protrusion, 38...Top plate part, 39, 40...Magnetic core, 41a, 41b, 44
a, 44b...Connecting part, 42, 45...Fixing part,
43, 46...Core part, 47...Primary coil, 4
8... Secondary coil, 49... Insulating paper, 50... Recess, 51, 52... Output lead wire, 53... Terminal.

Claims (1)

[Claims] 1. A plate-shaped fixing part, a magnetic core having a core part protruding perpendicularly from the fixing part, and a central axis in the longitudinal direction of the surface from which the core part of the fixing part projects is thick and thin at both ends, and the fixing part of the magnetic core. a plate-like connecting part and an upper plate part formed in the same shape as the surface of the core part, and a winding part located perpendicularly between the connecting part and the upper plate part and covering the outer surface of the core part; A bobbin having a base portion provided on its upper surface with protruding portions provided at the bottom of both ends of a connecting portion and formed so as to form a plurality of recesses together with the connecting portion, and a coil wound around a winding portion of the bobbin. A trance.