JP2004039923A - Transformer - Google Patents

Abstract

Provided is a transformer having good output efficiency and less harmful effects due to harmonic components.
A transformer having a primary coil (2) and a secondary coil (3), wherein an insulating layer (11) is coated on a winding flange (10a) for winding a secondary coil, and the primary coil (2) is wound thereon. did.
[Selection diagram] Fig. 1

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a transformer having a winding collar and having primary and secondary coils, and more particularly to a winding structure of a primary coil.
[0002]
[Prior art]
Hereinafter, a conventional transformer will be described with reference to the drawings.
FIG. 2 is a sectional view of a transformer according to a first conventional example, and shows a state in which a primary coil 2 and a secondary coil 3 are wound around a bobbin 1. FIG. The primary coil 2 and the secondary coil 3 are wound side by side on the bobbin 1 in the axial direction of the magnetic core 6.
[0003]
In this transformer, since the coupling between the primary coil 2 and the secondary coil 3 is poor, the distributed capacitance and leakage inductance between the two coils are large, and it is difficult to obtain an efficient output. Particularly in a transformer that generates a high voltage, since the turns ratio between the primary coil 2 and the secondary coil 3 is large, various adverse effects such as an increase in output fluctuations and current peaks due to harmonic components due to distributed capacitance and leakage inductance are caused. Had occurred.
[0004]
FIG. 3 is a sectional view of a transformer according to a second conventional example. In order to reduce the distributed capacitance and leakage inductance of the primary coil 2 and the secondary coil 3 and improve the coupling, in the transformer shown in FIG. 3, the primary coil 2 is wound around the primary bobbin 4, and The secondary coil 3 is wound by superimposing the secondary bobbin 5.
[0005]
In this winding structure, the coupling between the primary coil 2 and the secondary coil 3 is good, the output can be obtained efficiently, and the harmful effects due to the harmonic components can be reduced, but the primary coil bobbin 4 and the secondary coil bobbin 5 Two bobbins were required, increasing costs.
[0006]
[Problems to be solved by the invention]
As described above, the primary and secondary coils are required to be wound with good coupling between the primary coil and the secondary coil, to reduce the distributed capacitance and leakage inductance, to obtain an output efficiently, and to obtain a transformer having a small harmonic component. The following two bobbins must be used, and there is a problem that the cost is high.
[0007]
Alternatively, in a case where a layer such as an insulating tape is provided on a general primary coil and a secondary winding is wound thereon, in a high-voltage transformer having a large number of turns of the secondary coil, an interlayer paper winding or The structure must be a laminated winding or the like, and there is a problem that the manufacturing cost is increased.
[0008]
SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks of the prior art, and to provide a transformer having high output efficiency and less harmful effects due to harmonic components.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a transformer having a primary coil and a secondary coil, wherein an insulating layer is provided on a winding collar for winding a secondary coil, and the primary coil is wound thereon. It is characterized by being turned.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIG. FIG. 1 is a cross-sectional view of a transformer according to an embodiment of the present invention.
[0011]
The secondary coil 3 is wound between a number of winding collars 10a formed at equal intervals on the bobbin 10, and the insulating layer 11 is coated on the winding collar 10a over substantially the entire area of the bobbin 10 in the axial direction. I have. The primary coil 2 is wound thereon, and the primary coil 2 and the secondary coil 3 are arranged in parallel along the axial direction of the magnetic core 6.
[0012]
The insulating layer 11 is formed by winding an insulating tape of polyurethane or polyester, for example. The width of the insulating tape is larger than the interval between the winding flanges 10a, and the outer winding flanges 10b at both ends of the bobbin 10 are used. The width of the insulating layer 11 is regulated by 10c.
[0013]
Here, the insulating layer 11 not only has a function of electrically insulating the primary coil 2 and the secondary coil 3 but also serves as a mechanical base for winding the primary coil 2. 11 is supported and reinforced by each winding collar 10a. It is sufficient that the insulating layer 11 has a thickness enough to wind the primary coil 2, and an inexpensive and compact transformer can be obtained as compared with a case where a bobbin for the secondary coil is formed by molding.
[0014]
The distance between the secondary coil 3 and the primary coil 2 can be ensured by the height of the winding collar 10a of the secondary coil 3, but the height of the winding collar 10a is kept low and the thickness of the insulating layer 11 is adjusted by the number of turns. As a result, the distance between the two coils can be ensured.
[0015]
【The invention's effect】
As described above, according to the present invention, a primary coil and a secondary coil can be superposed and wound with an inexpensive structure, so that a well-coupled winding with small distributed capacitance and leakage inductance can be obtained, and output efficiency can be improved. Therefore, it is possible to provide a transformer with less adverse effects due to harmonic components.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a transformer according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of a transformer according to a first conventional example.
FIG. 3 is a sectional view of a transformer according to a second conventional example.
[Explanation of symbols]
2 Primary coil 3 Secondary coil 10 Bobbin 10a Winding collar 10b, 10c Outer winding collar 11 Insulating layer

Claims (1)

A transformer having a primary coil and a secondary coil, wherein an insulating layer is provided on a winding collar for winding a secondary coil, and the primary coil is wound thereon.

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