JPH0731527Y2 - Trance - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a transformer used in, for example, a DC / DC converter, an isolation amplifier, or the like.

[Conventional technology]

 A conventional example of this type of transformer is shown in FIG.

This transformer has a bobbin 5 made of an insulating material and a primary winding 1
The first secondary winding 2 is wound with the insulating tape 4 interposed therebetween, and the second secondary winding 3 is further wound with the insulating tape 4 interposed therebetween.

Two terminal blocks 5a and 5b are provided on the left and right below the bobbin 5, and a plurality of pin terminals 6 are planted therein, respectively, and two lead wires 1a and 1b of the primary winding 1 are provided. Is the two lead wires of the secondary winding 2 on each pin terminal 6 of the one terminal block 5a.
Two lead wires 3a and 3b of 2a and 2b and the secondary winding 3 are connected to respective pin terminals 6 of the other terminal block 5b.

Although not shown, the bobbin 5 has a semi-cracked core passed through the bobbin 5 from the left and right sides (the core shown in FIG. 1B).
17).

[Problems to be solved by the device]

In the above transformer, since the primary winding 1, the secondary windings 2 and 3 are wound in an overlapping manner, the insulating tape 4 must be used in order to secure the withstand voltage between the windings 1 to 3, That is, the insulating tape 4 must be wound between the windings one by one, which causes a problem of poor workability.

Further, the lead wires 1a and 1b of the primary winding 1 pass between the secondary windings 2 and 3 and the wall surface of the bobbin 5, and the lead wires 2a and 2b of the secondary winding 2 are connected to the secondary winding 3. And the wall surface of the bobbin 5, each lead wire must be passed through an insulating tube in order to ensure a withstand voltage between the windings, and workability is also poor in this respect. However, such a poor workability leads to an increase in the cost of the transformer.

Further, as described above, the lead wires 1a and 1b of the primary winding 1 pass between the secondary windings 2 and 3 and the wall surface of the bobbin 5, and the lead wires 2a and 2b of the secondary winding 2 are connected to each other. The lead wires 2a and 2b and the lead wires 3a and 3b are drawn to the same side because they are drawn out between the next winding and the wall surface of the bobbin 5, respectively.
Also cross each other or approach each other, so that the stray capacitance between the primary winding 1 and the secondary windings 2 and 3 and between the secondary winding 2 and the secondary winding 3 is large, resulting in poor noise characteristics ( That is, noise is easily transmitted between the windings).

Therefore, the main object of the present invention is to improve these points and to provide a transformer with good workability and small stray capacitance between each winding.

(Means for Solving the Problem) In order to achieve the above-mentioned object, the transformer of the present invention is provided with a partition plate on the bobbin, and by this, a plurality of windings are wound separately from each other in the axial direction of the bobbin. A slit is provided on at least one of the two terminal blocks, two protrusions are provided on both sides of the slit so as to be positioned diagonally to each other, and each winding start and winding end of two windings of the plurality of windings are provided. At least one of the lead wires of the same is passed through the slit and is positioned by the projection so as to be connected to the pin terminals of the terminal block on the same side so that the lead wires of the same winding are adjacent to each other, and It is characterized in that an eave is provided on the upper side of the terminal block on the side where the is provided so as to partition from the core.

〔Example〕

FIG. 1 shows a transformer according to an embodiment of the present invention. (A) is a front view thereof, (B) is a right side view thereof,
(C) is a bottom view thereof. The core is not shown except for FIG.

The transformer of this embodiment includes a bobbin 15 made of an insulating material and having two terminal blocks 15a and 15b on the left and right sides below the bobbin 15.

One terminal block 15a has four pin terminals 16 in this example,
The other terminal block 15b has two pin terminals 16 in this example,
Each is planted.

Further, in this example, two partition plates 15c are provided in the winding portion of the bobbin 15 so that the primary winding 11, the first secondary winding 12 and the second secondary winding 13 are connected to the bobbin. The windings are separated from each other in 15 axial directions.

In addition, in this example of the two terminal blocks of the bobbin 15, a slit 15d is provided near the center of the terminal block 15a on the secondary winding 13 side, and two columnar protrusions 15e are provided on both sides of the slit 15d. And 15f are provided obliquely to each other (that is, the protrusion 15e is on the upper side and the protrusion 15f is on the lower side). Incidentally, in this specification, the lower side means the pin terminal 16 side, and the upper side means the opposite side.

Further, in this example, the lead wire 13a on the winding start side of the secondary winding 13 closer to the terminal block 15a is positioned by the slit 15d so as not to be displaced downward by the upper projection 15e.
Connect it to the second pin terminal 16 from the right in the figure (C), and similarly, let the lead wire 13b on the winding end side of the secondary winding 13 pass through the slit 15d and keep it downward by the projection 15e. It is positioned and connected to the pin terminal 16 at the right end.

In addition, the lead wire 12a on the winding start side of the secondary winding 12 is positioned so that it does not come off from the terminal block 15a by the lower projection 15f while allowing the slit 15d to pass through and the left end in FIG. 1 (C). In this example, the lead wire 12b on the winding end side of the secondary winding 12 connected to the pin terminal 16 of
The second pin terminal is connected to 16. The lead wires 12a and 12b of the secondary winding 12 are the lead wires 13a of the secondary winding 13 described above.
Are positioned so as to be slanted by the projections 15f and 15e, respectively, so that they intersect three-dimensionally. More specifically, the lead-out line 13a side is the upper side (however, FIG. 1 (C) is a bottom view, so it is the lower side in FIG. 1), and three-dimensionally intersects.

By the way, the lead wires of the same secondary winding are connected to the adjacent pin terminals 16 in order to prevent the wiring patterns from crossing on the other side of the printed circuit board or the like of the transformer.

On the other hand, the lead wire 11a on the winding start side and the lead wire 11b on the winding end side of the primary winding 11 are connected to the terminal block 1 on the opposite side to the above.
It is connected to each of the two pin terminal blocks 16 planted in 5b.

Then, as shown in FIG. 1 (B), the two cores 17 having a half-split structure are aligned from both sides of the bobbin 15, and the cylindrical portion 17a of each core 17 is passed through the hole 15h of the bobbin 15.

Further, an eave 15g is provided above the terminal block 15a on the side where the slit 15d is provided so as to partition the core 17 from the terminal block 15a.

As described above, the bobbin 15 is provided with the partition plate 15c and each winding 11 to 1
By winding 3 separately from each other in the axial direction of bobbin 15, it is not necessary to wind an insulating tape between each winding as in the conventional example, and workability is improved.

Also, by winding each winding 11 to 13 as described above, the lead wire of the winding does not pass between the other winding and the wall surface of the bobbin as in the conventional example, and the lead wire is Since it is not necessary to pass it through an insulating tube as in the example, workability is improved also from this point.

The windings 11 to 13 are wound as described above, and the lead wires of the primary winding 11 and the lead wires of the secondary windings 12 and 13 are drawn out to the terminal blocks on the opposite sides to each other. And the secondary windings 12 and 13 have a small stray capacitance, which improves noise characteristics. Further, the withstand voltage between the primary winding 11 and the secondary windings 12 and 13 can be easily increased.

In addition, the above-mentioned slits 15d and protrusions 15 on the terminal block 15a.
If the lead wires of both secondary windings 12 and 13 are simply connected to the same pin terminal 16 as described above without providing e and 15f, at least two lead wires of different secondary windings are on the same plane. Therefore, the withstand voltage and the stray capacitance between the secondary windings 12 and 13 become a problem.

On the other hand, in this embodiment, since the terminal block 15a is provided with the slit 15d and the projections 15e and 15f as described above,
With these, the lead wires 12a and 12b of the secondary winding 12 and the lead wire 13a of the secondary winding 13 can be three-dimensionally intersected, and since the two protrusions 15e and 15f are offset obliquely from each other, The distance L between the leader line 12a and the leader lines 13a and 13b can also be made large. As a result, the withstand voltage between both secondary windings 12 and 13 can be increased, and the stray capacitance between both secondary windings 12 and 13 can be reduced, which also contributes to noise characteristics. An excellent transformer is obtained.

Further, when the lead wires 12a, 13a, 13b are positioned by the protrusions 15e, 15f as described above, the lead wires and the core 17 that is located above them are closer to each other, but this embodiment Since the bobbin 15 is provided with the above-mentioned eaves 15g, the creepage distance becomes long, and the dielectric strength between the secondary windings 12 and 13 and the core 17 also becomes high.

In this embodiment, in connection with the winding machine and the like, the lead wire 12b of the secondary winding 12 is connected to the pin terminal 16 without passing through the slit 15d, but this lead wire 12b is also connected to the lead wire 12a side. Similarly, the slit 15d may be passed through, and the protrusion 15f may be positioned to connect to the pin terminal 16.

Further, in this embodiment, the lead wires 13a and 1a of the secondary winding 13 are
Although both 3b are connected to the pin terminal 16 through the slit 15d, for example, the lead wire 13b on the winding end side is slit 1
It may be directly connected to the pin terminal 16 without passing through 5d.

Also, when drawing out the lead wires of the two windings (for example, the primary winding 11 as described above and a winding such as another tertiary winding) on the terminal block 15b side, the same as on the terminal block 15a side. The structure of may be adopted. That is, the terminal block 15b side may be provided with the same slits 15d, protrusions 15e, 15f, and eaves 15g, in which case the dielectric strength between both windings is increased and the stray capacitance is reduced. You can

Even in the case of a transformer having only two windings in total, the primary winding and the secondary winding, if the lead wires of both windings are pulled out to the same side, the slit 15d, protrusions 15e, 15f and eaves 15g By providing the same one as above, the withstand voltage between both windings can be increased and the stray capacitance can be reduced.

[Effect of device]

As described above, according to the present invention, it is not necessary to use an insulating tape, an insulating tube or the like as in the conventional example, so that the workability is excellent and therefore the cost can be reduced.

Further, since it is easy to obtain a withstand voltage between each winding or between the winding and the core, a transformer having a small size and a high withstand voltage can be obtained.

Further, since the stray capacitance between the windings can be reduced, the one having excellent noise characteristics can be obtained.

[Brief description of drawings]

FIG. 1 shows a transformer according to an embodiment of the present invention. (A) is a front view thereof, (B) is a right side view thereof,
(C) is a bottom view thereof. FIG. 2 is a front view showing an example of a conventional transformer, with the core omitted. 11 ... Primary winding, 12, 13 ... Secondary winding, 11a, 11b, 12a, 12b, 13
a, 13b ... Leader wire, 15 ... Bobbin, 15a, 15b ... Terminal block, 15c
… Partition plate, 15d… Slit, 15e, 15f… Protrusion, 15g… Eaves, 1
6 ... pin terminal, 17 ... core.

Claims (1)

[Scope of utility model registration request] 1. A bobbin made of an insulating material, having two terminal blocks on the left and right sides below the bobbin, a plurality of windings wound around the bobbin, and both bobbin terminal blocks. In the transformer having a plurality of pin terminals and a core passed through the bobbin, a partition plate is provided on the bobbin so that the plurality of windings are wound separately from each other in the axial direction of the bobbin. A slit is provided on at least one of the two terminal blocks, and two protrusions are provided on both sides of the slit so as to be positioned diagonally to each other, and each winding start of the two windings of the plurality of windings is At least one of each of the lead wires at the end of winding is passed through the slit and positioned by the protrusion, and the lead wires of the same winding are connected to the pin terminals of the terminal block on the same side, respectively, and The above Transformer, characterized in that a visor to partition between the side terminal block of the core to the top of which is provided a Tsu bets.