JPH07326524A - Transformer - Google Patents

Abstract

PURPOSE:To provide a smaller transformer with improved coupling characteristic between primary and secondary coils in a transformer used for various electric equipment. CONSTITUTION:In a winding spool 31 of an inside bobbin 30 into which multiple winding spools are inserted for engagement, a lead wire connected and wound around a bottom terminal 37 is connected to a top terminal 34, then, winding is performed from the top terminal 34 to a winding spool 46 of an outside engagement bobbin 45 and then wired to the bottom terminal 37, for improved function and characteristics.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer used in various video equipment, home appliances, audio equipment, industrial equipment, communication equipment and the like.

[0002]

2. Description of the Related Art FIGS. 6 to 8 are perspective views showing the steps of assembling a winding frame of a conventional transformer, and FIGS. 9 and 10 are sectional views of the transformer. A conventional transformer will be described with reference to the drawings. FIG. 6 shows the inner bobbin and the bobbin 1 of the inner bobbin.
An upper end flange 2 and a lower end flange 3 are provided at both ends of the. An enlarged portion 4 is provided at both ends of the lower end flange 3, and a plurality of lower end terminals 5 are planted at the lower end of the enlarged portion 4. Winding is reel 1
After that, the lead wire 7 is hooked on the projection 6 provided on a part of the upper end collar 2 and is wire-connected to the lower end terminal 5. FIG. 7 shows the inner bobbin fitted with an intermediate fitting bobbin. An upper end flange 9 and a lower end flange 10 are provided at both ends of the winding frame 8 of the intermediate fitting bobbin, and a lead catching projection 11 is provided on a part of the upper end flange 9. After the winding is performed on the bobbin 8, the lead wire is hooked on the protrusion 11 to form the wiring protrusion 1.
It is connected to the lower end terminal 5 of the inner bobbin through the space between the two. A plurality of windings are made on this intermediate fitting bobbin in a similar manner. FIG. 8 shows the outer fitting bobbin fitted to the intermediate fitting bobbin. An upper flange 14 is provided at the upper end of the bobbin 13 of this outer fitting bobbin, and a lower flange 1 is provided at the lower end.
5 are provided. Wind the reel 13 and then
After the lead wire is hooked on the protrusion 16 provided with the upper flange 14, it passes between the protrusions for wiring 17 and the lower terminal 5 of the inner bobbin.
Hardwired to. At this time, the lower end flanges 10 and 15 of the intermediate fitting bobbin and the outer fitting bobbin are in contact with and supported by the lower end flange 3 of the innermost inner bobbin. The structure of this transformer will be described in detail with reference to FIGS. 9 and 10. In order to improve the degree of coupling between the primary side and the secondary side of the transformer, the primary coils 19 and 20 are arbitrarily divided and wound on the inner bobbin and the outer fitting bobbin, and the secondary coil wound on the intermediate fitting bobbin is wound. The coil 21 is configured to be sandwiched. The divided primary coils were electrically connected by tapping the same at the lower end terminal 5 of the inner bobbin. Further, although it is not necessary to connect one end of the shield windings 22 and 23 for noise suppression on the circuit, both ends of the shield windings 22 and 23 are wired to different terminals of the lower end terminal 5 of the inner bobbin.

[0003]

SUMMARY OF THE INVENTION Primary coils 19, 20
In order to improve the coupling with the secondary coil 21, the primary coil 19 and 20 are divided and wound so as to sandwich the secondary coil 21, but in the conventional configuration, the primary coil 19 and
The winding start and end of the coil wound on the winding frame of the inner bobbin and the outer fitting bobbin around which 20 is wound are both
All are wired to the lower terminal 5 of the inner bobbin. At least one lower end terminal 5 for relaying the divided primary coils 19 and 20 is required. In addition, the primary coils 19 and 2
For the convenience of wiring each winding of No. 0 to the lower end terminal 5, the lead wire is hooked on the protrusions 6 and 16 provided on the upper ends of the winding frames 1 and 13, and the winding is folded back and drawn to the lower end terminal 5 for wiring. Therefore, this winding has the lead wire folded back,
Since the thickness of the winding frame must be large, a space is created in a portion other than the extraction lead wire in the winding frame, and the distance to the secondary coil 21 is increased to weaken the degree of coupling. Further, since the shield windings 22 and 23 provided on the primary side are not connected on the circuit, it is not necessary to fold the winding lead wire and lead out the wiring to the lower end terminal 5, and to connect both ends of the shield windings 22 and 23. Wiring the lower end terminal 5 further increases the thickness of the winding frame required for the winding on the primary side, increases the outer shape of the transformer, and also allows the selection of the wiring terminal of the primary coil. The degree will be limited.

[0004]

In order to solve this problem, the present invention provides an inner bobbin with an upper end terminal made of a metal pin on the upper end flange and a plurality of lower end terminals implanted on the lower end flange. The lead wire at one end of one coil wound around the bobbin is connected to the upper end terminal, the other coil is wound around the intermediate fitting bobbin fitted to this inner bobbin, and fitted to this intermediate fitting bobbin. The outer fitting bobbin is wound with the remaining portion of one coil, one end of the coil is connected to the upper end terminal, and a magnetic core is incorporated into these fitted bobbins.

[0005]

With this structure, the upper bobbin of the inner bobbin is planted with an upper end terminal made of a metal pin, and this terminal is used for the wiring of one coil. The protrusion for hooking the lead wire provided on the upper flange of is not required, and the wiring that was conventionally done at the lower end terminal of the inner bobbin is divided and wound while the tap terminal for relaying the coil is unnecessary. Therefore, the terminal used at one end of the winding that is not connected on the shield winding circuit becomes unnecessary, and the flexibility of the primary side circuit wiring of the lower end terminal increases, and even if the bobbin is downsized, It is possible to ensure a safe distance. Further, since the lead wire that folds back from the protrusion provided on the upper end of the winding frame at the lower end terminal is eliminated, it is not necessary to secure the thickness of the lead wire that is folded back that is conventionally provided in the winding frame. The thickness of the winding frame required for can be reduced, the transformer can be downsized, and the degree of coupling between one coil and the other coil that are divided and wound can be further improved.

[0006]

EXAMPLES An example of the present invention will be described below.
3 to 5 are perspective views showing the structure of the winding frame of the transformer of the present invention and the assembling steps of the winding frame, and FIGS. 1 and 2 are sectional views of the transformer of the present invention. The structure of the transformer of the present invention will be described with reference to FIGS. FIG. 3 shows an inner bobbin 30, and a bobbin 31 of the inner bobbin 30 has flanges at both ends. That is, the upper end is provided with the upper flange 32 and the lower end is provided with the lower flange 33. An upper end terminal 34 made of one or more metal pins is planted in the upper end collar 32, and the upper end terminal 34 is located near the upper end terminal 34 of the upper end collar 32.
Wiring protrusions 35 are provided for wiring. Further, the lower end flange 33 has an enlarged portion 36 at both ends thereof.
The lower end terminal 37 is planted in. After wiring the lower end terminal 37 to wind the coil around the bobbin 31, the lead wire 38
Is routed through the wiring projections 35 provided on the upper flange 32 and wound around the upper terminal 34 for wiring. When a shield winding is wound around the inner bobbin 30, after the winding and wiring of the primary coil is performed, the lead wire wound from the lower end terminal 37 is a protrusion for wiring provided on the upper flange 32. The upper end terminal 34 is wound through the gap 35 and is wired. FIG. 4 shows the inner bobbin 30 fitted with an intermediate fitting bobbin 39. The intermediate fitting bobbin 39 is provided with an upper end collar 42 having a protrusion 41 for hooking a lead on the upper end of the winding frame 40, and a lower end collar 43 at the lower end. Winding is reel 4
The lead wire is hooked on the protrusion 41 and is connected to the lower end terminal 37 through the groove between the protrusions for wiring 44. In FIG. 5, the outer fitting bobbin 45 is fitted to the intermediate fitting bobbin 39. An upper end flange 47 is provided at an upper end portion of the winding frame 46, and a protrusion 48 for wiring is provided on the upper end flange 47 together with a protrusion 48 for hooking a lead. The primary coil is tapped at the same terminal of the primary coil that is wired to the upper end terminal 34 of the inner bobbin 30, is passed through the groove of the wiring projection 49 at the upper end of the winding frame, and is wound around the winding frame 46. Line and reel 4
The wire is connected to the lower end terminal 37 through the groove of the wiring protrusion 51 provided on the lower end flange 50 at the lower end of the wire 6. Further, when the shield winding is wound around the outer fitting bobbin 45, the lead wire for wiring is provided on the upper flange 47 after winding from the lower terminal 37 before winding the primary coil. Protrusion 4
The upper end terminal 34 is wound through the groove between the upper and lower terminals 34 and wired. Next, this transformer will be described in detail with reference to FIGS. The primary coils 52 and 53 are arbitrarily divided and wound around the inner bobbin 30 and the outer fitting bobbin 45, and the secondary coil 54 wound around the intermediate fitting bobbin 39 is sandwiched between them. . The divided primary coils 52 and 53 are electrically connected to each other by tapping the upper end terminal 34 of the inner bobbin 30 to the same upper end terminal 34.
Moreover, as shown in FIG. 2, a shield winding 5 for noise suppression is provided.
Since one end of 5,56 is not connected on the circuit,
The winding start of the winding is wired to the lower terminal 37 of the inner bobbin 30, and the winding end is wired to the upper terminal 34.

In FIG. 1 and FIG. 2, 57 is a magnetic core of EE type, EI type or the like incorporated in the bobbin.

[0008]

As described above, by adopting the structure of the present invention, the relay terminal of the primary coil which is divided and wound, or the winding which is not connected on the circuit of the shield winding is used. By providing the terminal to be used at one end with the upper end terminal on the upper flange of the bobbin of the inner bobbin, the flexibility of wiring selection for the lower end terminal of the primary side circuit is increased and even if the bobbin is downsized, the primary side pin terminal is provided. It is possible to ensure a safe distance between them. Further, the thickness of the winding frame required for winding the primary coil can be reduced by the thickness of the lead wire required for folding the conventional winding, and the size of the transformer can be reduced, and the primary coil and the secondary coil can be made smaller. The degree of bonding can be further improved.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a transformer according to an embodiment of the present invention.

FIG. 2 is a sectional view of a transformer according to another embodiment of the present invention.

FIG. 3 is a perspective view of an inner bobbin used in the present invention.

FIG. 4 is a perspective view showing a state in which the intermediate fitting bobbin is fitted.

FIG. 5 is a perspective view showing a state in which the outer fitting bobbin is fitted.

FIG. 6 is a perspective view of a conventional inner bobbin.

FIG. 7 is a perspective view showing a state in which a conventional intermediate fitting bobbin is fitted.

FIG. 8 is a perspective view showing a state in which a conventional outer fitting bobbin is fitted.

FIG. 9 is a half sectional view of a conventional transformer.

FIG. 10 is a half cross-sectional view of another conventional transformer.

[Explanation of symbols]

 30 inner bobbin 31 winding frame 32 upper flange 33 lower flange 34 upper terminal 35 wiring protrusion 36 enlarged portion 37 lower terminal 38 lead wire 39 intermediate fitting bobbin 40 bobbin 41 protrusion 42 upper flange 43 lower protrusion 44 wiring protrusion 45 outside Mating bobbin 46 Winding frame 47 Upper flange 48 Protrusion 49 Wiring protrusion 50 Lower flange 51 Wiring protrusion 52 Primary coil 53 Primary coil 54 Secondary coil 55 Shield winding 56 Shield winding 57 Magnetic core

Claims (2)

[Claims] 1. An inner bobbin is provided with an upper end terminal made of a metal pin on an upper end flange and a plurality of lower end terminals is provided on a lower end flange, and a lead wire at one end of one coil wound on the inner bobbin is used as an upper end terminal. Connect and wind the other coil around the intermediate mating bobbin that is fitted to this inner bobbin, and wind the remaining part of one coil around the outer mating bobbin that is fitted to this intermediate bobbin. A transformer in which one end of a coil is connected to an upper end terminal and a magnetic core is incorporated in these fitted bobbins. 2. The transformer according to claim 1, wherein a shield winding is wound together with one coil, and one end of the shield winding is connected to an upper end terminal of the inner bobbin.