JP7004455B2 - Transformer winding structure - Google Patents

Description

The present invention relates to a bobbin and a winding structure of a transformer comprising a primary winding and a secondary winding wound around the bobbin.

Conventionally, for example, in Patent Document 1, in order to increase the degree of coupling between the primary winding and the secondary winding, a sandwich winding structure in which one winding is divided into two and the other winding is sandwiched between them is adopted. ..

In the transformer 100 adopting such a structure, for example, as shown in FIGS. 9 and 10, the secondary winding Ns1, the primary winding Np1, and the secondary winding are in order from the radial inner side to the radial outer side of the bobbin 101. Winding Ns2, primary winding Np2, and secondary winding Ns3 are wound. When these windings are wound around the bobbin 101, the primary windings Np1 and Np2 are respectively started to be wound from the lower end 101a of the bobbin 101 toward the upper end 101b, and are wound close to the upper end 101b of the bobbin 101. After being folded back, it may be pulled out from the lower end portion 101a of the bobbin 11 (see FIGS. 11B and 11D). Similarly, the secondary windings Ns1, Ns2, and Ns3 are also started to be wound from the lower end 101a of the bobbin 101 toward the upper end 101b, wound around the upper end 101b of the bobbin 101, folded back, and then the bobbin 101. It may be pulled out from the lower end 101a (see FIGS. 11 (A), 11 (C) and 11 (E)).

Japanese Unexamined Patent Publication No. 2008-159963

However, in the transformer described above, in each of the windings, the portion wound around the bobbin and the portion folded downward from near the upper end are in close contact with each other, and the winding start and winding end are on the same side of the bobbin, that is, Since it is pulled out from the lower end, it approaches and adheres closely. Therefore, there is a problem that the parasitic capacitance generated between the beginning and the end of the winding causes parasitic vibration and power consumption, and the efficiency at the time of standby light load is lowered.

Therefore, this invention was made in order to solve the above-mentioned problems, and it suppresses the generation of parasitic capacitance by preventing the winding start and winding end from coming close to each other so as not to be in close contact with each other, and the efficiency at the time of standby light load. It is an object of the present invention to provide a winding structure of a transformer which prevents the deterioration of the transformer.

The winding structure of the transformer according to the present invention includes a bobbin, an inner first winding wound around the outer peripheral portion of the bobbin, and an outer winding wound outward in the radial direction of the bobbin from the inner first winding. The first winding is wound between the inner first winding, the inner second winding wound radially inward from the inner first winding, and the inner first winding and the outer first winding. The outer second winding is provided , and the winding start of the inner first winding and the winding end of the outer first winding are pulled out from one end of the bobbin so as not to be in close contact with each other. The winding end of the first winding and the winding start of the outer first winding are drawn outward from the other end of the bobbin and connected to each other, while the winding start of the inner second winding and the outer first winding. The winding end of the two windings is pulled out from one end of the bobbin so that the winding end of the two windings does not come into close contact with each other, and the winding end of the inner second winding and the winding start of the outer second winding of the bobbin. It is characterized in that it is pulled out from the other end and connected .

The connection portion where the winding end of the inner first winding and the winding start of the outer first winding are connected, and the winding end of the inner second winding and the winding start of the outer second winding are connected. It is preferable that the connecting portion is covered with an insulating member and folded back to the outside of the outer first winding. As a result, it is possible to prevent the connection portion covered with the insulating member from coming into close contact with each winding, and to suppress the generation of parasitic capacitance.

The first winding may be the primary winding on the input side, and the second winding may be the secondary winding on the output side. As a result, the winding start and winding end of each winding are prevented from coming into close contact with each other to suppress the generation of parasitic capacitance, and the sandwich winding structure is used to reduce the contact area between the primary winding and the secondary winding. It can be increased to improve the degree of coupling between the primary winding and the secondary winding.

In the present invention, the inner second winding is wound radially inside the bobbin from the inner first winding, and the outer second winding is wound between the inner first winding and the outer first winding. By turning it, it can be made into a sandwich winding structure. Further, the winding start of the inner first winding and the winding end of the outer first winding were pulled out from one end of the bobbin, and the winding end of the inner first winding and the winding start of the outer first winding were connected. In the state, it is pulled out from the other end of the bobbin. As a result, while maintaining the sandwich winding structure, the winding start and winding end of each first winding are prevented from coming into close contact with each other to suppress the generation of parasitic capacitance and prevent the efficiency from decreasing during standby light load. can do. The winding start of the inner first winding and the winding end of the outer first winding drawn outward from one end of the bobbin can be directly connected to the printed circuit board. Thereby, the present invention can be applied not only to the bobbin extending parallel to the printed circuit board but also to the bobbin extending perpendicularly to the printed circuit board. Further, the winding start of the inner second winding and the winding end of the outer second winding are pulled out from one end of the bobbin, and the winding end of the inner second winding and the winding start of the outer second winding are of the bobbin. It was pulled out from the other end. As a result, it is possible to prevent the start and end of each second winding from coming into close contact with each other and suppressing the generation of parasitic capacitance, and to prevent the efficiency at the time of standby light load from deteriorating.

It is a perspective view of the transformer which concerns on embodiment of this invention. It is a schematic sectional drawing which shows the winding structure which concerns on 1st Embodiment wound around a bobbin. It is a schematic circuit diagram of the winding which concerns on 2nd Embodiment. It is a schematic sectional drawing which shows the winding structure which concerns on 2nd Embodiment wound around a bobbin. (A) to (E) are schematic views showing the winding order of the winding structure according to the second embodiment. It is a schematic sectional drawing which shows the winding structure which concerns on 3rd Embodiment. It is a schematic sectional drawing which shows the winding structure which concerns on 4th Embodiment. It is a schematic sectional drawing which shows the winding structure which concerns on 5th Embodiment. It is a schematic circuit diagram of a conventional winding. It is a schematic sectional drawing which shows the conventional winding structure. (A) to (E) are schematic views showing the winding order of the conventional winding.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

<First Embodiment>
As shown in FIGS. 1 and 2, the transformer 10a of the present embodiment includes a bobbin 11a and a first winding Np1, Np2 and a second winding Ns1 wound around the bobbin 11a.

The bobbin 11a is a frame body having a cylindrical bobbin body 13a in which the cavity 12 is formed, and a jaw portion forming a lower end (one end) 14a and an upper end (end) 15a of the bobbin body 13a. .. A magnetic material such as a ferrite core is inserted into the cavity 12. The first winding Np1 and Np2 and the second winding Ns1 are wound around the outer peripheral portion of the bobbin main body 13a.

The first windings Np1 and Np2 are the primary windings on the input side, and the inner primary winding Np1 which is the inner first winding wound radially inward of the bobbin 11a and the bobbin 11a from the inner primary winding Np1. It is composed of an outer primary winding Np2 which is an outer first winding wound outward in the radial direction of the above. The inner primary winding Np1 and the outer primary winding Np2 are wound in the longitudinal direction of the bobbin 11a, that is, between the lower end portion 14a and the upper end portion 15a.

The inner primary winding Np1 is wound around the outer circumference of the bobbin main body 13a from the lower end portion 14a of the bobbin 11a toward the upper end portion 15a. As a result, the winding start (one end) Np1a of the inner primary winding Np1 is pulled out from the lower end 14a of the bobbin 11a, and the winding end (other end) Np1b of the inner primary winding Np1 is the upper end of the bobbin 11a. It is pulled out from 15a. The inner primary winding Np1 is wound radially inward of the bobbin 11a from the outer primary winding Np2 and the secondary winding Ns1. That is, the inner primary winding Np1 is wound most radially inward of the bobbin 11a in the winding structure of the transformer 10a.

The outer primary winding Np2 is wound around the outer circumference of the bobbin main body 13a from the upper end portion 15a of the bobbin 11a toward the lower end portion 14a. As a result, the winding start (end end) Np2b of the outer primary winding Np2 is pulled out from the upper end portion 15a of the bobbin 11a, and the winding end (one end) Np2a of the outer primary winding Np2 is the lower end portion of the bobbin 11a. It is pulled out from 14a. The winding start Np2b of the outer primary winding Np2 is connected to the winding end Np1b of the inner primary winding Np1 by soldering. The connecting portion 16a is covered with a resin tube (insulating member) 17a, and is folded back and arranged outside the outer primary winding Np2. The outer primary winding Np2 is wound radially outward of the bobbin 11a from the inner primary winding Np1 and the secondary winding Ns1. That is, the outer primary winding Np2 is wound most radially outward of the bobbin 11a in the winding structure of the transformer 10a.

The second winding Ns1 is a secondary winding on the output side, and is wound in the longitudinal direction of the bobbin 11a, that is, between the lower end portion 14a and the upper end portion 15a. The secondary winding Ns1 is wound around the outer periphery of the bobbin main body 13a from the lower end portion 14a of the bobbin 11a toward the upper end portion 15a, and is folded downward in the vicinity of the upper end portion 15a of the bobbin 11a. As a result, the winding start (one end) Ns1a and the winding end (other end) Ns2b of the secondary winding Ns1 are pulled out from the lower end 14a of the bobbin 11a. The secondary winding Ns1 is wound between the inner primary winding Np1 and the outer primary winding Np2. As a result, the inner primary winding Np1, the secondary winding Ns1, and the outer primary winding Np2 are wound in this order from the radial inner side to the radial outer side of the bobbin 11a to form a sandwich winding structure.

[Characteristics of winding structure of transformer 10a of this embodiment]
The winding structure of the transformer 10a of the present embodiment has the following features.

A sandwich winding structure can be obtained by winding the secondary winding Ns1 between the inner primary winding Np1 and the outer primary winding Np2. Further, the winding start Np1a of the inner primary winding Np1 and the winding end Np2a of the outer primary winding Np2 are pulled out from the lower end portion 14a of the bobbin 11a, and the winding end Np1b and the outer primary winding of the inner primary winding Np1 are pulled out. The winding start Np2b of Np2 is pulled out from the upper end portion 15a of the bobbin 11a. As a result, while maintaining the sandwich winding structure, the winding start and winding end of each primary winding are prevented from coming into close contact with each other to suppress the generation of parasitic capacitance and prevent the efficiency at the time of standby light load from decreasing. be able to

Since the connecting portion 16a is covered with the resin tube 17a and folded back to the outside of the outer primary winding Np2, it is possible to prevent the connecting portion 16a from coming into close contact with each winding and suppress the generation of parasitic capacitance.

In each of the inner primary winding Np1 and the outer primary winding Np2, the winding start and the winding end do not come into close contact with each other to suppress the generation of parasitic capacitance, and the sandwich winding structure is used to form the primary windings Np1 and Np2. The contact area between the secondary windings Ns1 can be increased, and the degree of coupling between the primary windings Np1 and Np2 and the secondary windings Ns1 can be improved.

The winding start Np1a of the inner primary winding Np1 and the winding end Np2a of the outer primary winding Np2 drawn outward from the lower end portion 14a of the bobbin 11a can be directly connected to the printed circuit board. Thereby, the present invention can be applied not only to the bobbin extending parallel to the printed circuit board but also to the bobbin extending perpendicularly to the printed circuit board.

<Second Embodiment>
Next, the winding structure of the transformer 10b according to the second embodiment will be described with reference to FIGS. 3 and 4. The same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted as appropriate.

Since the winding structure of the inner primary winding Np1 and the outer primary winding Np2 is the same as that of the first embodiment, the description thereof will be omitted. The secondary winding Ns1 of the first embodiment was wound only between the inner primary winding Np1 and the outer primary winding Np2. On the other hand, the secondary winding of the second embodiment is between the inner secondary winding Ns2 wound radially inward from the inner primary winding Np1 and the inner primary winding Np1 and the outer primary winding Np2. It is composed of a wound intermediate secondary winding Ns3 and an outer secondary winding Ns4 wound radially outward from the outer primary winding Np2.

The inner secondary winding Ns2, the intermediate secondary winding Ns3, and the outer secondary winding Np4 are wound in the longitudinal direction of the bobbin 11b, that is, between the lower end (one end) 14b and the upper end (end) 15b. It is being turned. Each of the secondary windings Ns2, Ns3, and Ns4 is wound around the outer periphery of the bobbin body 13b from the lower end portion 14b of the bobbin 11b toward the upper end portion 15b, and is folded downward in the vicinity of the upper end portion 15b of the bobbin 11b. As a result, the winding start Ns2a, Ns3a, Ns4a and the winding end Ns2b, Ns3b, Ns4b of each secondary winding Ns2, Ns3, Ns4 are pulled out from the lower end portion 14b of the bobbin 11b.

The inner secondary winding Ns2, the inner primary winding Np1, the intermediate secondary winding Ns3, the outer primary winding Np2, and the outer secondary winding Ns4 are wound in this order from the radial inner side to the radial outer side of the bobbin 11b. And constitutes a sandwich winding structure. As a result, by increasing the contact area between the primary windings Np1, Np2 and the secondary windings Ns2, Ns3, Ns4, the degree of coupling between the primary windings Np1, Np2 and the secondary windings Ns2, Ns3, Ns4 Can be improved and copper loss can be reduced.

In the winding order of the transformer 10b of the second embodiment, first, the inner secondary winding Ns2 is started to be wound from the lower end portion 14b of the bobbin 11b toward the upper end portion 15b, folded downward in the vicinity of the upper end portion 15b of the bobbin 11, and then folded downward. The winding ends at the lower end 14b of the bobbin 11b (see FIG. 5A). Further, the inner primary winding Np1 starts winding from the lower end portion 14b of the bobbin 11b toward the upper end portion 15b, and ends winding at the upper end portion 15b of the bobbin 11b (see FIG. 5B). Next, the intermediate secondary winding Ns3 is started to be wound from the lower end portion 14b of the bobbin 11b toward the upper end portion 15b, folded downward in the vicinity of the upper end portion 15b of the bobbin 11b, and then finished winding at the lower end portion 14b of the bobbin 11b ( See FIG. 5 (C). After that, the outer primary winding Np2 starts winding from the lower end portion 14b of the bobbin 11b toward the upper end portion 15b, and ends winding at the upper end portion 15b of the bobbin 11b (see FIG. 5D). Finally, the outer secondary winding Ns4 starts winding from the lower end 14b of the bobbin 11b toward the upper end 15b, is folded downward near the upper end 15b of the bobbin 11b, and then ends winding at the lower end 14b of the bobbin 11b (. See FIG. 5 (E)). After the winding of each winding to the bobbin 11b is completed, the winding end Np1b of the inner primary winding Np1 drawn from the upper end portion 15b of the bobbin 11b and the winding start Np2b of the outer primary winding Np2 are soldered and connected. do. The connection portion 16b is covered with the tube 17b, folded back, and arranged outside the outer secondary winding Ns4.

<Third Embodiment>
Next, the winding structure of the transformer 10c according to the third embodiment will be described with reference to FIG. The same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted as appropriate.

The primary winding of the first embodiment is composed of two windings, an inner primary winding Np1 and an outer primary winding Np2. On the other hand, the primary winding of the third embodiment is from four primary windings Np3 to Np6 wound between the lower end (one end) 14c and the upper end (end) 15c of the bobbin 11c. It is configured.

Of the four primary windings Np3 to Np6, the inner upper winding primary winding (inner first winding) Np3 and the outer upper winding primary winding wound radially outward from the inner upper winding primary winding Np3. The wire (inner third winding) Np4 is wound around the outer periphery of the bobbin main body 13c from the lower end portion 14c of the bobbin 11c toward the upper end portion 15c. As a result, the winding start (one end) Np3a of the inner upper winding primary winding Np3 and the winding start (one end) Np4a of the outer upper winding primary winding Np4 are pulled out from the lower end 14c of the bobbin 11c and are pulled out to the inner upper side. The winding end (the other end) Np3b of the winding primary winding Np3 and the winding end (the other end) Np4b of the outer upper winding primary winding Np4 are pulled out from the upper end portion 15c of the bobbin 11c.

Of the four primary windings Np3 to Np6, the inner lower winding primary winding (outer first winding) Np5 and the outer lower winding primary winding wound radially outward from the inner lower winding primary winding Np5. (Outer third winding) Np6 is wound around the outer periphery of the bobbin main body 13c from the upper end portion 15c of the bobbin 11c toward the lower end portion 14c. As a result, the winding start (other end) Np5b of the inner lower winding primary winding Np5 and the winding start (other end) Np6b of the outer lower winding primary winding Np6 are pulled out from the upper end 15c of the bobbin 11c. The winding end (one end) Np5a of the inner lower winding primary winding Np5 and the winding end (one end) Np6a of the outer lower winding primary winding Np6 are pulled out from the lower end 14c of the bobbin 11c.

Then, the winding end Np3b of the inner upper winding primary winding Np3 and the winding start Np5b of the inner lower winding primary winding Np5, and the winding end Np4b of the outer upper winding primary winding Np4 and the winding start of the outer lower winding primary winding Np6. Np6b are collectively connected by soldering. The connection portion 16c is covered with a resin tube 17c, and is folded back and arranged on the outside of the outer lower winding primary winding Np6.

The secondary windings Ns5 to Ns9 are wound around the outer circumference of the bobbin main body 13c from the lower end 14c of the bobbin 11c toward the upper end 15c, and are folded downward in the vicinity of the upper end 15c of the bobbin 11c. As a result, the winding start Ns5a to Ns9a and the winding end Ns5b to Ns9b of the secondary windings Ns5 to Ns9 are pulled out from the lower end portion 14c of the bobbin 11c.

The secondary winding Ns5 is wound around the outer circumference of the bobbin body 13c radially inside the primary winding Np3 facing inward. The secondary winding Ns6 is wound around the outer circumference of the bobbin body 13c between the inner upper winding primary winding Np3 and the outer upper winding primary winding Np4. The secondary winding Ns7 is wound around the outer circumference of the bobbin body 13c between the outer upper winding primary winding Np4 and the inner lower winding primary winding Np5. The secondary winding Ns8 is wound around the outer circumference of the bobbin body 13c between the inner lower winding primary winding Np5 and the outer lower winding primary winding Np6. The secondary winding Ns9 is wound around the outer circumference of the bobbin main body 13c radially outside the outer lower winding primary winding Np6. As described above, between the inner upper winding primary winding Np3 and the outer upper winding primary winding Np4 wound in order from the radial inner side to the radial outer side of the bobbin 11c, the outer upper winding primary winding Np4 and the inner side. A secondary winding is wound between the lower winding primary winding Np5, the inner lower winding primary winding Np5, and the outer lower winding primary winding Np6, respectively. As a result, while maintaining the sandwich winding structure, the winding start and winding end of each primary winding are prevented from coming into close contact with each other to suppress the generation of parasitic capacitance and prevent the efficiency at the time of standby light load from decreasing. be able to.

<Fourth Embodiment>
Next, the winding structure of the transformer 10d according to the fourth embodiment will be described. FIG. 7 is a schematic cross-sectional view showing the winding structure according to the fourth embodiment. The same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted as appropriate.

Since the winding structure of the inner primary winding Np1 and the outer primary winding Np2 is the same as that of the first embodiment, the description thereof will be omitted. The secondary winding Ns1 of the first embodiment was wound around the outer periphery of the bobbin main body 13a from the lower end portion 14a of the bobbin 11a toward the upper end portion 15a, and was folded downward in the vicinity of the upper end portion 15a of the bobbin 11a. On the other hand, the secondary winding Ns10 of the fourth embodiment is wound around the outer periphery of the bobbin body 13d from the lower end portion 14d of the bobbin 11d toward the upper end portion 15d without being folded downward near the upper end portion 15d of the bobbin 11d. It is being turned. As a result, the winding start (one end) Ns10a of the secondary winding Ns10 is pulled out from the lower end 14d of the bobbin 11d, and the winding end (other end) Ns10b of the secondary winding Ns10 is the upper end of the bobbin 11d. It is pulled out from 15d. Therefore, in addition to the primary winding Np1, the winding start Ns10a and the winding end Ns10b of the secondary winding Ns10 are prevented from coming into close contact with each other, and the generation of parasitic capacitance can be further suppressed.

<Fifth Embodiment>
Next, the winding structure of the transformer 10e according to the fifth embodiment will be described. FIG. 8 is a schematic cross-sectional view showing a winding structure according to a fifth embodiment. The same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted as appropriate.

Since the winding structure of the inner primary winding Np1 and the outer primary winding Np2 is the same as that of the first embodiment, the description thereof will be omitted. The secondary winding Ns1 of the first embodiment is composed of one winding. On the other hand, the secondary winding of the fifth embodiment is composed of two windings, an inner secondary winding (inner second winding) Ns11 and an outer secondary winding (outer second winding) Ns12. ing. The inner secondary winding Ns11 and the outer secondary winding Ns12 are wound in the longitudinal direction of the bobbin 11, that is, between the lower end (one end) 14e and the upper end (end) 15e.

The inner secondary winding Ns11 is wound around the outer circumference of the bobbin main body 13e from the lower end portion 14e of the bobbin 11e toward the upper end portion 15e. As a result, the winding start (one end) Ns11a of the inner secondary winding Ns11 is pulled out from the lower end 14e of the bobbin 11e, and the winding end (end) Ns11b of the inner secondary winding Ns11 is the bobbin 11e. It is pulled out from the upper end portion 15e. The inner secondary winding Ns11 is wound radially inward of the bobbin 11e from the inner primary winding Np1. That is, the inner secondary winding Ns11 is wound most radially inward of the bobbin 11e in the winding structure of the transformer 10e.

The outer secondary winding Ns12 is wound around the outer circumference of the bobbin main body 13e from the upper end portion 15e of the bobbin 11e toward the lower end portion 14e. As a result, the winding start (end end) Ns12b of the outer secondary winding Ns12 is pulled out from the upper end portion 15e of the bobbin 11e, and the winding end (one end) Ns12a of the outer secondary winding Ns12 is the bobbin 11e. It is pulled out from the lower end portion 14e. The winding start Ns12b of the outer secondary winding Ns12 is connected to the winding end Ns11b of the inner secondary winding Ns11 by soldering. The connection portion 16e is covered with a resin tube 17e and is folded and arranged outside the outer primary winding Np2.

The outer secondary winding Ns12 is wound between the inner primary winding Np1 and the outer primary winding Np2. As a result, the inner secondary winding Ns11, the inner primary winding Np1, the outer secondary winding Ns12, and the outer primary winding Np2 are wound in this order from the radial inner side to the radial outer side of the bobbin 11e, and the primary winding is wound. The wires Np1 and Np2 and the secondary windings Ns11 and Ns12 each form a sandwich winding structure. As a result, in addition to the primary windings Np1 and Np2, the secondary windings Ns11 and Ns12 have a sandwich structure, and the winding start and winding end are approached in each of the inner secondary winding Ns11 and the outer secondary winding Ns12. It is possible to suppress the generation of parasitic capacitance by preventing them from coming into close contact with each other and prevent the efficiency from being lowered at the time of a light standby load.

Although the embodiments of the present invention have been described above with reference to the drawings, the specific configuration is not limited to these embodiments. The scope of the present invention is shown not only by the description of the above-described embodiment but also by the scope of claims, and further includes all modifications within the meaning and scope equivalent to the scope of claims.

In the above embodiment, the connection portion is covered with a tube, but the present invention is not limited to this. The same effect can be obtained by adopting a configuration in which an insulating tape is wrapped around the outer peripheral portion of the bobbin around which the winding is wound, instead of covering the connection portion with the tube. Further, if it is possible to avoid electrical contact between the connecting portion and another conductor portion, it is possible to eliminate the need for an insulating member.

In the above embodiment, the same effect can be obtained by adopting a structure in which the primary winding is the secondary winding and the secondary winding is the primary winding.

Regarding the winding structure of the transformer, the winding structure of the primary winding and the secondary winding is not limited to the above embodiment as long as at least one of the primary winding and the secondary winding has a sandwich winding structure.

In the first embodiment, the inner primary winding Ns1 is wound from the lower end portion 14a to the upper end portion 15a of the bobbin 11a, and then the outer primary winding Ns2 is wound from the upper end portion 15a to the lower end portion 14a of the bobbin 11a. However, the present invention is not limited to this, and after winding the inner primary winding Ns1 from the lower end 14a to the upper end 15a of the bobbin 11a, the rotation direction in which the winding is wound is changed to reverse rotation, and then the outer primary winding Ns2 is wound. The bobbin 11a may be wound from the lower end portion 14a to the upper end portion 15a.

In the above embodiment, the winding structure of the present invention is applied to a vertical transformer extending perpendicular to the printed circuit board, but the present invention is not limited to this, and the winding structure may be applied to a horizontal transformer extending parallel to the printed circuit board. .. However, if the mounting space of the printed circuit board is limited, the space can be saved by adopting the vertical transformer structure.

10a, 10b, 10c, 10d, 10e Transformer 11a, 11b, 11c, 11d, 11e Bobbin 14a, 14b, 14c, 14d, 14e Lower end 15a, 15b, 15c, 15d, 15e Upper end 16a, 16b, 16c, 16d, 16e connection part 17a, 17b, 17c, 17e tube (insulating member)
Np1 inner primary winding (inner first winding)
Np1a winding start (one end)
Np1b winding end (other end)
Np2 outer primary winding (outer first winding)
Np2a winding end (one end)
Np2b winding start (other end)
Np4 outer upper winding primary winding (inner third winding)
Np6 outer lower winding primary winding (outer third winding)
Ns1 secondary winding (second winding)
Ns10 secondary winding (second winding)
Ns10a winding start (one end)
Ns10b winding end (other end)
Ns11 inner secondary winding (inner second winding)
Ns11a winding start (one end)
Ns11b winding end (other end)
Ns12 outer secondary winding (outer second winding)
End of Ns12a winding (one end)
Ns12b winding start (other end)

Claims (3)

With bobbin
The inner first winding wound around the outer peripheral portion of the bobbin ,
The outer first winding wound radially outward of the bobbin from the inner first winding, and the outer first winding.
The inner second winding wound radially inward from the inner first winding and the inner second winding.
It comprises an outer second winding wound between the inner first winding and the outer first winding .
The winding start of the inner first winding and the winding end of the outer first winding are pulled out from one end of the bobbin so as not to be in close contact with each other , and the winding end of the inner first winding is formed. While the winding start of the outer first winding is drawn outward from the other end of the bobbin and connected to the winding start,
The winding start of the inner second winding and the winding end of the outer second winding are pulled out from one end of the bobbin so as not to be in close contact with each other, and the winding end of the inner second winding and the outer side are pulled out. A transformer winding structure characterized in that the winding start of the second winding is pulled out and connected to the outside from the other end of the bobbin . The connection portion where the winding end of the inner first winding and the winding start of the outer first winding are connected, and the winding end of the inner second winding and the winding start of the outer second winding are connected. The winding structure of the transformer according to claim 1, wherein the connecting portion is covered with an insulating member and folded back to the outside of the outer first winding. The winding structure of a transformer according to claim 1 or 2 , wherein the first winding is a primary winding on the input side and the second winding is a secondary winding on the output side.

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