JPH0935948A - Transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the noise components and to prevent the transmission of noise components between each winding by winding a part of a primary winding on a lower bobbin, alternately winding the remainder of the primary winding and a secondary winding in a plurality of split winding grooves of an upper bobbin and winding an auxiliary primary winding in the split winding grooves. SOLUTION: A part of a primary winding 34 connected in series is wound on a lower bobbin 39. The remainder of the primary winding 34 is wound at a first stage, a third stage and a fifth stage from a lower section and a secondary winding 35 at a second stage and a fourth stage from the lower section in the five split winding grooves 33 of an upper bobbin 31 so that the remainder of the primary winding 34 and the secondary winding 35 connected in parallel are alternated. An auxiliary primary winding 37 is wound in the split winding groove 33 at the first stage from the lower section in the split winding grooves 33, on which the remainder of the primary winding 34 is wound. The diameters of the primary winding 34, the secondary winding 35 and the auxiliary primary winding 37 are equalized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer used as a switching power supply for various electronic devices.

[0002]

2. Description of the Related Art A conventional transformer is constructed as shown in FIGS.

That is, in the conventional transformer shown in FIG. 7, one primary winding 2a, which is divided into two, is wound around a winding frame 1 having flanges at both ends, and a secondary winding 3 is wound on the winding. The remaining primary winding 2b is wound on top of which the auxiliary primary winding 4 is
And the magnetic core 5 is incorporated in the winding frame 1.

The windings are insulated from each other by an adhesive tape 6, and the winding width is regulated by an insulating spacer 7. The conventional transformer shown in FIG. 8 has a winding frame 10 having five split winding grooves 9 divided by four split flanges 8.
It has. And the first stage from the bottom of this reel 10,
Primary winding 1 divided into three winding grooves 9 in the third and fifth stages
1 is wound, and the secondary winding 12 divided into two is divided into the second and fourth divided winding grooves 9 from the bottom, and is wound into the first and third divided winding grooves 9 from the bottom. The auxiliary primary winding 12 is wound on the primary winding 11 and the magnetic core 14 is incorporated in the winding frame 10.

[0005]

According to the configuration of FIG. 7,
Since the facing area between the windings is large and the thickness of the adhesive tape 6 is suppressed to the necessary minimum, the distance between the windings becomes short and the degree of coupling increases. Therefore, the power supply efficiency is increased, the leakage magnetic flux inside the transformer is reduced, and the noise component generated from the transformer itself, that is, the noise component generated due to the amount of leakage magnetic flux inside the transformer is small. Become. However, on the other hand, there is a problem in that the electrostatic capacitance between the windings becomes large and the noise component is easily transmitted to each winding.

Further, according to the configuration of FIG. 8, the primary winding 11 divided into three and the auxiliary primary winding 13 divided into two are divided by the secondary winding 12 divided into two and the brim 8 and the thickness thereof is reduced. Therefore, the capacitance between the windings becomes small, and the noise component is less likely to be transmitted between the windings.However, the lower the degree of coupling, the lower the power supply efficiency and the noise component generated from the transformer itself. Since the leakage magnetic flux in the interior increases, there is a problem in that the amount of noise components generated increases.

The present invention solves the above-mentioned conventional problems and improves the power supply efficiency by increasing the degree of coupling, and reduces the amount of noise components generated from the transformer itself even if the degree of coupling is increased. The purpose of the present invention is to provide a transformer in which noise components are not easily transmitted between the windings.

[0008]

In order to achieve the above object, the present invention provides an upper winding frame having a plurality of dividing grooves divided by a dividing collar on the outer periphery of the hollow portion, and is mounted on the hollow portion of the upper winding frame. In addition, the lower reel having a hollow portion, and a magnetic core inserted in the hollow portion of the lower reel, a part of the primary winding is wound on the lower reel, a plurality of divisions of the upper reel In the winding groove, the remainder of the primary winding and the secondary winding are alternately wound, and the auxiliary primary winding is wound around the divided winding groove in which the remainder of the primary winding is wound. is there.

[0009]

With the above construction, since the primary winding and the secondary winding are divided by the dividing collars, the electrostatic capacitance between the respective windings becomes small, noise components are less likely to be transmitted between the respective windings, and the dividing collars are separated. Since the secondary winding divided by is sandwiched between the primary windings in three directions, the degree of coupling between the windings can be improved.

Furthermore, since the insulation between the primary winding and the secondary winding can be ensured by the thickness of the upper bobbin and the thickness of the dividing brim, an adhesive tape or an insulating spacer is unnecessary.

[0011]

【Example】

(Embodiment 1) A transformer according to a first embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a transformer according to the first embodiment of the present invention, and FIG. 2 is a wiring diagram of the transformer.

In FIG. 1, the transformer has five split winding grooves 33 divided by four split flanges 32, an upper winding frame 31 having a hollow portion, and a hollow portion 31 a of the upper winding frame 31. Lower reel 39 to be mounted, and this lower reel 39
And a magnetic core 38 to be inserted into the hollow portion 39a.

A part of the primary winding 34 connected in series is wound around the lower reel 39, and the five divided winding grooves 33 of the upper reel 31 are arranged in parallel with the rest of the primary winding 34. The rest of the primary winding 34 is placed in the first stage, the third stage, and the fifth stage from the bottom, and the secondary winding 35 is placed in the second stage from the bottom, so that the connected secondary windings 35 alternate. The auxiliary primary winding 37 is wound in the divided winding groove 33 of the first stage from the bottom among the divided winding grooves 33 wound in the first stage and the rest of the primary winding 34. . Note that FIG. 2 shows an electric circuit diagram.

With this structure, the primary winding 34 and the secondary winding 35 are divided by the upper bobbin 31, and the auxiliary primary winding 37 and the secondary winding 35 are divided by the dividing collar 32. In terms of operation and safety standards. It provides the necessary electrical and structural insulation. Further, the secondary winding 35 is sandwiched by the primary winding 34 wound around the lower winding frame 39 and the primary winding 34 wound around the upper winding frame 31 from three directions, so that the degree of coupling can be improved.

Further, since the lower winding frame 39, the primary winding 34 of the upper winding frame 31 and the secondary winding 35 are separately arranged by the upper winding frame 31 and the dividing flange 32 thereof, the capacitance between the respective windings. Can be achieved.

Further, if the diameters of the primary winding 34, the secondary winding 35, and the auxiliary primary winding 37 are the same, the productivity can be improved.

(Second Embodiment) A transformer according to a second embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 is a sectional view of a transformer according to the second embodiment of the present invention, and FIG. 4 is a wiring diagram of the transformer.

The transformer of the second embodiment has a two-output specification, whereas the transformer of the first embodiment has a one-output specification.

In FIG. 3, the transformer has six divided winding grooves 33 divided by five divided flanges 32, an upper winding frame 31 having a hollow portion, and a transformer mounted on the hollow portion of the upper winding frame 31. The lower winding frame 39 and the magnetic core 38 inserted into the hollow portion of the lower winding frame 39 are provided.

A part of the primary winding 34 connected in series is wound around the lower winding frame 39, and the rest of the primary winding 34 is wound from the bottom to the six divided winding grooves 33 of the upper winding frame 31. The secondary winding 35 is wound on the third, fifth stages from the bottom, the other secondary winding 36 is wound on the first stage from the bottom on the fourth, sixth and sixth stages. A configuration in which an auxiliary primary winding 37 having three layers of insulation coating is wound around the third and fifth split winding grooves 33 from the bottom among the split winding grooves 33 around which the rest of the wire 34 is wound. I am trying.

With the above-mentioned structure, the auxiliary primary winding 37 and the secondary winding 35 are wound in the same split winding groove 33 by using the conductive wire having three layers of insulation coating. Electrical and structural insulation required for operation, safety and safety standards can be provided, and the degree of coupling between the windings can be improved.

Further, another secondary winding 36 is connected to the secondary winding 35.
By dividing and winding the same split winding groove 33, the output stability of the other secondary winding 36 can be improved. At this time, the other secondary windings 36 may be connected in series or in parallel. Also, a cross-sectional view of this transformer is shown in FIG. 5, and a connection diagram thereof is shown in FIG.

With this configuration, the degree of coupling between the windings can be finely adjusted by changing the number of split winding grooves 33 and the split ratio of each winding. In addition, the primary winding 34 and the secondary winding 3
5. If the diameters of the other secondary winding 36 and the auxiliary primary winding 37 are the same, the productivity can be improved.

The primary winding 34 and the secondary winding 35 may be connected in any manner other than the series / parallel connection in the first and second embodiments.

[0027]

As described above, according to the present invention, the degree of coupling between the primary and secondary windings is increased to improve the power supply efficiency, and the amount of noise components generated from the transformer itself is reduced. In addition, it is possible to provide a transformer in which noise components are less likely to be transmitted between the windings.

[Brief description of drawings]

FIG. 1 is a sectional view of a transformer showing a first embodiment of the present invention.

FIG. 2 is a wiring diagram of the transformer.

FIG. 3 is a sectional view of a transformer showing a second embodiment of the present invention.

[Fig. 4] Connection diagram of the transformer

FIG. 5 is a sectional view of a transformer showing a third embodiment of the present invention.

[Fig. 6] Connection diagram of the transformer

FIG. 7 is a sectional view of a conventional transformer.

FIG. 8 is a sectional view of another conventional transformer.

[Explanation of symbols]

 31 Upper reel 32 Split collar 33 Split winding groove 34 Primary winding 35 Secondary winding 36 Secondary winding 37 Auxiliary primary winding 38 Magnetic core 39 Lower reel

Claims (5)

[Claims] 1. An upper winding frame having a plurality of divided winding grooves divided by a dividing collar on an outer periphery of the hollow portion, a lower winding frame attached to the hollow portion of the upper winding frame and having a hollow portion, A magnetic core inserted into the hollow portion of the lower reel, a part of the primary winding is wound on the lower reel, the plurality of split winding grooves of the upper reel, the rest of the primary winding and the secondary A transformer in which winding and winding are wound alternately. 2. The transformer according to claim 1, wherein the auxiliary primary winding is wound in the divided winding groove in which the primary winding of the upper bobbin is wound. 3. The transformer according to claim 2, wherein the primary winding, the secondary winding, and the auxiliary primary winding have the same diameter. 4. The transformer according to claim 2, wherein the auxiliary primary winding is wound around the divided winding groove around which the secondary winding is wound, and the auxiliary primary winding is covered with three layers of insulating coating. 5. The transformer according to claim 4, wherein another secondary winding is wound in the divided winding groove around which the secondary winding is wound.