JPH10208948A - Winding structure of high-voltage transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a winding structure of a high-voltage transformer whereby the coupling characteristic of the transformer is improved and its leakage inductance is reduced. SOLUTION: This winding structure comprises primary and secondary side windings L1, L2 wound around a bobbin 1 and this bobbin 1 is fitted with a pair of cores 2, 2 to form a high-voltage transformer. In this case, the secondary side winding L2 is given a part-winding structure and the primary side winding L1 is disposed in the central portion of continually arranged secondary part windings L21, L22,... which constitute the secondary side winding L2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-voltage transformer used for TVs, liquid crystals, and the like, and more particularly to a winding structure of a high-voltage transformer.

[0002]

2. Description of the Related Art Such a winding component forms a coil by winding a conductive wire around an insulating bobbin serving as a winding core.
A bobbin is known in which a core material (ferrite core) serving as a magnetic core is attached to a hollow portion of the bobbin.

[0003] Among such winding parts, particularly in a high-voltage transformer used for a TV, a liquid crystal or the like, a high voltage of, for example, 2 to 3 KV is induced in the secondary winding of the transformer. In some cases, an accident such as a rare short circuit may occur due to insufficient voltage or withstand voltage, and it is extremely important to secure insulation between windings and withstand voltage to maintain reliability.

Therefore, conventionally, as shown in FIG. 4, a bobbin 1 is provided with a plurality of flange portions 3 to form a plurality of winding sections, and a conductive wire is wound around these winding sections to achieve a particularly high height. The secondary winding L2 from which a voltage is induced is divided into windings, and the divided windings L21, L22, L23, and L24 generate a divided low voltage to provide insulation between the windings. The withstand voltage was ensured.

As for the winding structure, the primary winding L1 is connected to one end of the bobbin 1 (on the side of the connection terminal 5) as shown in the figure.
And each of the divided windings L21, L22, L23, L24 constituting the secondary winding L2 is connected to the bobbin 1
Are generally connected in the longitudinal direction.

[0006]

However, in the above winding structure, there is an imbalance in the distance between the primary winding L1 and each of the divided windings L21 to L24. Since the transformer is arranged at the position farthest from L1, the coupling of the transformer (coupling between the primary winding L1 and the secondary winding L2) is deteriorated, a large amount of leakage inductance is generated, and the efficiency of the transformer is reduced. Problem.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks, and has as its object to provide a high-voltage transformer winding structure suitable for improving transformer coupling and reducing leakage inductance.

[0008]

According to the first aspect of the present invention, an insulating bobbin (1) serving as a winding core and a pair of cores serving as a magnetic core assembled to the bobbin (1). (2, 2) and a primary winding (L1) and a secondary winding (L2) formed by winding a conductive wire around the bobbin (1). The bobbin (1) is provided with a plurality of flange portions (3) for winding division, the secondary winding (L2) is divided and formed, and the secondary winding (L2) is formed. ), The primary side winding (L1) is arranged near the center of the continuous split secondary windings (L21, L22...).

According to the present invention, an insulating bobbin (1) serving as a winding core and a pair of cores (2, 2) serving as a magnetic core attached to the bobbin (1) are provided. , A primary winding (L) formed by winding a conductive wire around the bobbin (1).
1) and a secondary winding (L2), wherein the bobbin (1) is provided with a plurality of flange portions (3) for winding sections. The secondary winding (L2) and the primary winding (L1) are divided and formed, and the divided secondary windings (L21, L22,. ), The divided primary windings (L11, L12...) Forming the primary winding (L1) are arranged alternately and substantially uniformly.

Further, according to the present invention, a plurality of flanges provided on the bobbin (1) at positions of the gaps (4) formed at the butting portions of the cores (2, 2). It is characterized in that one of the parts (3) is arranged.

[0011]

FIG. 1 is a structural view showing a first embodiment of a high-voltage transformer to which a winding structure of the present invention is applied.
Is a front view, (b) is a side view, and (c) is a rear view. In order to simplify the description, the same reference numerals are used in the following description for the parts common to the related art.

In the drawing, reference numeral 1 denotes a resin bobbin serving as a winding core of a coil, which is provided with several flange portions 3 on its winding surface to form winding sections E1 to E5 for partial winding. The bobbin 1 is hollow so that a core material (ferrite core) can be attached to the bobbin 1. The hollow portion has a middle leg 2a of a pair of E-shaped cores 2 and 2 mounted face to face. , 2a are inserted from both sides to form a magnetic core.

A plurality of connection terminals 5 are provided at the lower end of the bobbin 1.
The winding ends of the wound primary winding L1 and secondary winding L2 are drawn out as lead portions 6 and connected to the corresponding connection terminals 5, respectively.

In the present embodiment, the secondary winding L2 is divided into four parts, and the winding structure is such that the primary winding L1 is arranged at the center of the divided winding. As described above, the secondary windings L21, L2 are divided into the winding sections E1, E2.
22 is a primary winding L1 in the winding section E3, and divided into secondary windings L23 and L24 in the winding sections E4 and E5.
Are connected in the longitudinal direction to form a high-voltage transformer.

The primary winding L1 and the secondary winding L2
When each of the lead portions 6 is pulled out and connected to the connection terminal 5 located at the lower end, the lead portion 6 is connected to the flange portion 3.
Between the lead portions 6 and the windings (between the lead portions 6 of the primary winding L1 and the secondary winding L2, or between the secondary winding L2 and the primary side). A predetermined creepage distance corresponding to the high voltage generated between the lead portions 6 of the winding L1 is ensured.

As described above, the primary winding L1 is disposed at the center of the bobbin 1, and the divided secondary windings L21 to L24 are provided on both sides thereof.
, The distance between the primary winding L1 and the secondary winding L2 can be reduced.
(In the present embodiment, the distance between the primary winding L1 and the split secondary windings L21 and L24 located farthest from each other is reduced by half compared with the conventional winding structure shown in FIG. 4) Significant improvement and leakage inductance is halved.

According to actual measurements, the leakage inductance was 6.4 mH in the conventional type, whereas it was 2.3 mH in the present invention with the same transformer specification.

Further, in the present winding structure, as shown in FIG. 1B, the diameter of the flange portion 3 of the winding section E3 in which the primary winding L1 is formed is increased, so that the lead portion 6 The creepage distance between the windings can be ensured as in the prior art, and no special parts are required for that purpose. However, in the present embodiment, since the primary winding L1 is located between the divided secondary windings L21 to L24, the winding of the divided secondary winding L22 is terminated as shown in FIG. It is necessary to temporarily pull out the lead portion 6 and the lead portion 6 at the start of winding of the divided secondary winding L23 to the connection terminal 5 and tangentially connect them. Does not occur.

As described above, according to the present embodiment, an efficient high-voltage transformer can be manufactured without adding new parts, increasing the number of assembling steps, or deteriorating the withstand voltage performance between windings. Becomes

FIG. 2 is a front view of a high-voltage transformer according to a second embodiment of the present invention, in which the number of transformer winding divisions is further increased, which is an application of the first embodiment.

In this embodiment, the secondary winding L2 has a six-split winding structure, the primary winding L1 has a two-split winding structure, and the six-split divided secondary windings have the same structure. The configuration is such that the divided primary windings divided into two portions are evenly arranged in a well-balanced manner.

More specifically, as shown in FIG.
1 and E2, the secondary windings L21 and L22 are divided into winding sections E3, the primary winding L11 is divided into winding sections E4 and E5, and the secondary windings L23 and L24 are divided into winding sections E6. The winding L12 is
The winding structure is such that divided secondary windings L25 and L26 are respectively formed in winding sections E7 and E8.

As described above, the number of divisions of each winding is increased, such as the secondary winding, the primary winding, the secondary winding, the primary winding, and the secondary winding. Each split secondary winding L21
To L26 and the divided primary windings L11 and L12 are alternately arranged in a well-balanced manner, so that the primary winding L1 and the secondary winding L2
The transformer coupling is further improved, and the leakage inductance is significantly reduced (reduced to 1/4 of the conventional type).

By the way, generally, in a winding part, like a high-voltage transformer of the present invention, a pair of E-shaped cores 2 and 2 forming a magnetic core are formed in a hollow portion of a bobbin 1 in which a winding is formed. The middle legs 2a, 2a are assembled to face each other so as to be inserted from both sides. The abutting portions of the opposed middle legs 2a, 2a have a pair of these cores 2, 2
A slight gap 4 for preventing saturation of the magnetic path formed by the above is formed.

However, since the core 4 does not have a core material in the portion where the gap 4 is formed, the coupling of the windings corresponding to the core tends to be weak.

Therefore, in the third embodiment of the present invention, when performing the above-described divisional winding, one of the plurality of flange portions 3 provided on the bobbin 1 is taken into consideration in consideration of the number of divisions of the winding.
The divided winding configuration was such that the individual pieces were arranged on the gap 4.

With such a configuration, since the winding is not formed on the flange portion 3, the winding does not exist in the portion where the gap 4 is formed, and the coupling of the winding is affected by the air core portion of the gap 4. Disappears, so the transformer coupling is improved,
It is possible to further reduce the leakage inductance.

For example, as shown in FIG.
2 has a winding structure of five divisions, the divided secondary windings L21 and L22 are divided into the winding divisions E1 and E2, and the primary winding L1 is divided into the winding division E3.
Into winding sections E4, E5, and E6.
By forming the windings 24 and L25, the flange 3 serving as a barrier between the divided secondary winding L23 and the primary winding L1 is located on the gap 4.

Further, the present invention is not limited to the above-described structure, and it is sufficient that the position of the gap 4 and the position of the flange portion 3 coincide with each other. Therefore, the winding structure shown in FIG. The effect of can be obtained. In this case, on the gap 4, the split secondary winding L23 and the flange portion 3 serving as a barrier for the split secondary winding L24 are arranged.

[0030]

As described above, according to the first aspect of the present invention, the secondary winding has a divided winding structure, and the primary winding is disposed at the center of each divided winding. As a result, the distance between the primary winding and the secondary winding can be reduced as compared with the conventional type. As a result, transformer coupling is improved and leakage inductance is reduced.

Moreover, with such a winding structure, it is possible to realize an efficient high-voltage transformer without adding new parts or increasing the number of assembling steps, and without deteriorating the withstand voltage performance between the windings. Can be.

According to the present invention described in claim 2,
The secondary winding and the primary winding have a split winding structure, and these split secondary windings and split primary windings are evenly distributed in a well-balanced manner. The distance can be further reduced, so that the transformer coupling is further improved and the leakage inductance is significantly reduced.

According to the third aspect of the present invention, the gap between the core and the flange portion of the bobbin are made to coincide with each other so that the winding is not present at the portion where the gap is formed. In combination with the invention, the transformer coupling is further improved, and the leakage inductance can be further reduced.

[Brief description of the drawings]

FIG. 1 is a structural view showing an embodiment of a high-voltage transformer to which a winding structure of the present invention is applied, (a) is a front view, (b) is a right side view, and (c) is a rear view.

FIG. 2 is a front view of a high-voltage transformer different from FIG.

FIG. 3 is a front view of a high-voltage transformer different from FIG. 2;

FIG. 4 is a structural view of a conventional high-voltage transformer, where (a) is a front view, (b) is a right side view, and (c) is a rear view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bobbin 2 Core 3 Flange part 4 Gap L1 Primary winding L2 Secondary winding L11, L12 ... Split primary winding L21, L22 ... Split secondary winding

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Satoshi Ota 5-36-11 Shimbashi, Minato-ku, Tokyo Inside Fuji Electric Chemical Co., Ltd.

Claims (3)

[Claims] An insulative bobbin (1) serving as a winding core, a pair of cores (2, 2) serving as a magnetic core attached to the bobbin (1), and a conductive wire wound around the bobbin (1). A winding structure of a high-voltage transformer composed of a primary winding (L1) and a secondary winding (L2) formed by turning, wherein the bobbin (1) has a flange portion for a winding section. (3)
Are provided to form the secondary winding (L2), and the secondary windings (L2, L22,...) Constituting the secondary winding (L2) are divided. A winding structure for a high-voltage transformer, wherein the primary winding (L1) is arranged near the center. 2. An insulating bobbin (1) serving as a winding core, a pair of cores (2, 2) serving as a magnetic core attached to the bobbin (1), and a conductive wire wound around the bobbin (1). A winding structure of a high-voltage transformer composed of a primary winding (L1) and a secondary winding (L2) formed by turning, wherein the bobbin (1) has a flange portion for a winding section. (3)
Are provided so that the secondary winding (L2) and the primary winding (L1) are dividedly wound, and the divided secondary winding (L2) is continuously connected to the secondary winding (L2). Winding (L21,
L22..), The divided primary windings (L11, L12...) Constituting the primary winding (L1) are arranged alternately and substantially uniformly. . 3. The bobbin (1) is located at a position of a gap (4) formed at an abutting portion of the cores (2, 2).
3. One of a plurality of flanges (3) provided in the first and second flanges is disposed.
The winding structure of the high-voltage transformer according to 1.