JP2000357614A - Chamber type transformer and coil bobbin thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive chamber type transformer in which occupation volume is reduced while employing the same general purpose coil bobbin for chamber type transformers of various specifications by extending the creeping distance of a partition wall for separating respective chambers. SOLUTION: The coil bobbin for a chamber type transformers comprises at least one chamber 105a, 105c, 105e for winding a primary winding 107a, 107b, 107c, and at least one chamber 105b, 105d, 105f for winding a secondary winding 108a, 108b, 108c. The chambers 105a, 105c, 105e for primary winding and the chambers 105b, 105d, 105f for secondary winding are arranged in the direction of the rotary axis of a coil bobbin 103 and the width of at least one chamber is adjustable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a chamber type transformer and a coil bobbin of the chamber type transformer, and more particularly, to a chamber type transformer used for a switching power supply or a low frequency power supply and a coil bobbin of the chamber type transformer. In recent years, for example, a chamber type transformer has been used as a switching power supply used for a television or other various electric devices. Further, a chamber-type transformer is used as a low-frequency power supply that uses the frequency of a commercial power supply as it is. Such a chamber type transformer uses a coil bobbin having a plurality of chambers for applying (winding) windings (primary winding and secondary winding), and performs winding processing and connection with connection pins. After the processing, a ferromagnetic core (ferrite core) is inserted into the center of the coil bobbin to assemble.
By the way, since the size of each chamber of the coil bobbin is determined by the specification of each transformer, a dedicated coil bobbin corresponding to each transformer is required. Therefore, there is a demand for providing a coil bobbin of a chamber type transformer that can be used for various types of transformers in general.

[0002]

2. Description of the Related Art FIG. 1 is a perspective view showing an example of a conventional chamber type transformer, FIG. 2 is an exploded perspective view schematically showing a ferrite core in the chamber type transformer of FIG.
FIG. 3 is a perspective view schematically showing one example of each partition wall in the chamber type transformer of FIG. In FIG. 1, reference numeral 1 denotes a transformer, 2 denotes a ferrite core, 3 denotes a coil bobbin (winding frame), 4 denotes a partition wall, and 5 denotes a chamber.

As shown in FIGS. 1 and 2, the ferrite core 2 is composed of two E-shaped core units 21 and 22, and these core units 21 and 22
Is mounted on the coil bobbin 3 which has been subjected to the winding process and the connection process with the connection pin by using an adhesive 20 (see FIG. 1). The core unit 2
Some 1 and 22 are attached to the coil bobbin by a metal plate or the like without using the adhesive 20. When a chamber type transformer is used as a switching power supply, a ferrite core 2 is used.
When used as a low frequency power supply, a transformer is formed using an EI core or the like instead of the ferrite core.

[0004] Each of the core units 21 and 22 is provided with a cylindrical central core portion 21a and 22a, respectively. The central core portions 21a and 22a are provided in the interior 30 (see FIG. 3) of the cylindrical portion (31) of the coil bobbin 3. The two core units 21 and 22 are fixed by the adhesive 20 in the inserted state. Here, in the coil bobbin 3 shown in FIG. 3, only one partition wall 4 is provided for the cylindrical portion 31. However, in the actual coil bobbin 3, a plurality of partition walls 4 are integrated with the cylindrical portion 31. Is formed. A chamber 5 having an insulating function by the adjacent partition wall 4 is provided, and a winding (primary winding or secondary winding) is wound around each chamber 5. In the winding operation of the coil around each chamber, a conductive wire (such as an enameled wire) is wound around the chamber by rotating the coil bobbin 3 around the center of the cylindrical portion 31 as a rotation axis. At this time, it is also possible to wind a winding around a plurality of chambers at the same time. In FIG. 1, the cylindrical portion 31 is drawn as a circular tube having a circular cross section. However, for example, the cross section may be formed as a square or rectangular tube.

In FIG. 1, reference numeral 11 denotes a connection pin for a primary winding, 12 denotes a connection pin for a secondary winding, and 6 denotes a connection pin for a secondary winding.
Reference numeral 1 denotes a connecting wire for the primary winding. Note that the connection wire (62) for the secondary winding is provided on the opposite side of the transformer with respect to the connection wire 61 for the primary winding, and therefore cannot be drawn in FIG. The connection pin 11 for the primary winding and the connection pin 12 for the secondary winding are provided on both sides of the transformer 1 so as to face each other. As shown in FIG. 3, each of the partition walls 4 has a comb-like shape at both side ends 41 and 42, and one of the comb-like portions (41).
Through the connecting wire 61 for the primary winding, and to the other comb-shaped portion (42), the connecting wire 6 for the secondary winding.
2 allows each connection wire to be held and short-circuited with other connection wires and windings (especially, short-circuited between the primary-side connection wire and winding and the secondary-side connection wire and winding). In this case, the guide pins are guided to the positions of the connection pin 11 for the primary winding and the connection pin 12 for the secondary winding, respectively.

That is, the connection pins 1 for all the primary windings
1 is arranged on one side of the transformer, and connection wires 61 for all primary windings are also provided on the same side as the connection pins 11 for primary windings. Furthermore, the connection pins 12 for all secondary windings are located on the other side of the transformer, and
The connection wires 62 for all secondary windings are also provided on the same side as the connection pins 12 for secondary windings. This effectively separates the primary side and secondary side connection pins and connection wires.

FIG. 4 is a diagram showing a cross section of a coil bobbin and each winding in an example of a conventional chamber type transformer. In FIG. 4, reference numerals 4a to 4g (4) denote partition walls, 5a to 5f (5) denote chambers, 7a to 7e denote primary windings, and 8a to 8g denote secondary windings. FIG.
As shown in FIG. 1, the coil bobbin 3 has a cylindrical portion 3 into which cores (ferrite cores 21a and 22a) are inserted.
1 and a plurality of partition walls 4a formed integrally with the cylindrical portion.
4g, and the windings 7a to 7e and 8a to 8g are wound in the chambers 5a to 5f between the adjacent partition walls.

The primary windings 7a to 7e are wound in primary winding chambers 5a, 5c and 5e, and
a to 8g are wound in chambers 5b, 5d and 5e for secondary winding. That is, the primary windings 7a to 7e and the secondary windings 8a to 8g are wound in different chambers, respectively, and the primary winding chambers 5a, 5c, 5e and the secondary windings are wound. Chambers 5b, 5 for wire
d and 5e are alternately provided in the rotation axis direction of the coil bobbin 3 (the axial direction of the cylindrical portion 31), so that leakage inductance is reduced to an allowable range.

[0009] As shown in FIG.
a to 7e and secondary windings 8a to 8g are wound in different chambers (primary winding chambers 5a, 5c, 5e and secondary winding chambers 5b, 5d, 5e) to ensure safety. The primary windings (7
b, 7c, 7d) or between the secondary windings (8a, 8b; 8
c, 8d; 8e, 8f, 8g) can also be concentrically wound in the same primary winding chamber or secondary winding chamber. Further, as shown in FIG. 3 described above, the partition walls 4b to 4g are connected to the connection wires (6) for the primary windings from the primary windings 7a to 7e and the secondary windings 8a to 8g.
In order to guide 1) and the connection wire (62) for the secondary winding to the connection pin (11) for the primary winding and the connection pin (12) for the secondary winding, respectively, both ends are comb-shaped. (41 and 42).

In the above-mentioned chamber type transformer, a plurality of chambers are provided by a plurality of partition walls, and a primary winding or a secondary winding is wound in each chamber. Insulation structure is simpler than that of a transformer in which windings and secondary windings are concentrically wound, and it is possible to simultaneously perform winding for multiple chambers. It has the advantage of high efficiency. However, in the chamber type transformer, the degree of coupling between the primary winding and the secondary winding tends to be low because the primary winding and the secondary winding are arranged along the core (axial direction of the cylindrical portion). In addition, there are various problems such as an increase in leakage inductance and leakage magnetic flux and a large voltage fluctuation. For this reason, for example, as shown in FIG. 4 described above, the number of chambers is increased and primary windings and secondary windings are alternately arranged, so that the number of chambers is suppressed to a practically acceptable range. . The number of windings (number of circuits)
Is usually about 2 to several 20 pieces. If there are a large number of chambers, efficient winding operation of the windings can be performed using one chamber for each winding.

[0011]

In the conventional coil bobbin 3 of the chamber type transformer, for example, as shown in FIG.
As shown in FIG. 3, the partition walls 4a and 4g located at both ends of the cylindrical portion 31, and the other partition walls 4b to 4f
Are all formed integrally with the cylindrical portion 31. Further, the size (width) of each of the chambers 5a to 5f is determined (fixed) for each coil bobbin 3.

Incidentally, the size of the chamber (the volume of the winding) required for each winding differs depending on the power, circuit configuration, and the like of the equipment to which the transformer is applied. For example, when the size of all the chambers is fixed, the windings protrude in one chamber, and useless empty space remains in other chambers. Actually, since the windings cannot protrude from the chamber, the windings having a large volume that protrude from the chamber are divided and wound around a plurality of chambers, and the windings having a small volume are together with other windings. It is necessary to wind concentrically around one chamber, and as a result, the operation of winding and insulation (for example, insulation by taping) becomes complicated, and the advantages of the chamber type transformer cannot be fully exhibited. .

It is also possible to use a coil bobbin having a chamber having a size corresponding to the volume of each winding. However, using a dedicated coil bobbin requires a dedicated molding die, which is not only complicated but also complicated. The same coil bobbin is used for chamber type transformers of various specifications (required output, circuit configuration, etc.) as they are in recent years. Things are getting harder.

Further, a chamber type transformer (a coil bobbin for a chamber type transformer) is originally provided with a chamber for the primary winding and a chamber for the secondary winding in order to increase the degree of coupling between the primary winding and the secondary winding. Are arranged alternately adjacent to each other. The dimensional structure of the partition wall for ensuring insulation between the primary winding and the secondary winding includes insulation performance (space distance, space distance, Creepage distance and insulation distance). That is, in a transformer having a structure in which a primary winding and a secondary winding are concentrically wound, for example, a thin insulator (film or molded body) is placed on the surface of the primary winding wound on a bobbin, On the other hand, since the secondary winding only needs to be wound, the space factor of the coil bobbin can be increased (the volume occupied by the transformer is reduced). However, in the case of the chamber type transformer, the primary winding and the secondary Since the windings are adjacent to each other in an open state in the air, a primary winding (a chamber for the primary winding) and a secondary winding (a chamber for the secondary winding) are required to ensure mutual insulation performance. ) Must be sufficient, and there is a problem that the transformer becomes large.

The present invention has been made in view of the above-described problems of the prior art, and provides a low cost, small occupied volume chamber transformer using the same coil bobbin for various types of chamber transformers. With the goal.
Another object of the present invention is to provide a chamber type transformer having a small occupied volume by increasing the creepage distance of a partition wall separating each chamber.

[0016]

According to a first aspect of the present invention, at least one primary winding chamber for winding a primary winding and at least one chamber for winding a secondary winding. A coil bobbin of a chamber type transformer having one secondary winding chamber, wherein the primary winding chamber and the secondary winding chamber are arranged in a rotation axis direction of the coil bobbin; There is provided a coil bobbin for a chamber type transformer, wherein the width of the chamber is adjustable.

According to a second aspect of the present invention, at least one primary winding chamber for winding primary windings arranged in the rotation axis direction and at least one primary winding chamber for winding secondary windings. A coil bobbin having one secondary winding chamber, wherein the width of the at least one chamber is adjustable; a ferrite core having a central core inserted into a cylindrical portion of the coil bobbin; And a connection pin to which a wire from each winding is connected, respectively.

According to a third aspect of the invention, at least one primary winding chamber for winding a primary winding and at least one secondary winding for winding a secondary winding. A coil bobbin of a chamber type transformer having a chamber for use in the chamber, wherein at least one end of a partition wall separating the respective chambers is tapered to extend a creepage distance. Is done.

According to a fourth aspect of the present invention, at least one primary winding chamber for winding a primary winding and at least one secondary winding for winding a secondary winding. A chamber type transformer comprising: a coil bobbin having a chamber; a core having a central core portion inserted into a cylindrical portion of the coil bobbin; and connection pins to which wires from the respective windings are respectively connected. Is provided.

According to the first mode or the second mode of the present invention, the width of at least one chamber can be adjusted, so that the same coil bobbin can be universally used for various types of chamber type transformers. Can be used. Further, according to the third mode or the fourth mode of the present invention, at least one end of the partition wall separating each chamber has a tapered shape, whereby the creepage distance can be extended.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a chamber type transformer and a coil bobbin of the chamber type transformer according to the present invention will be described in detail with reference to the drawings. FIG. 5 is a diagram showing a cross section of a coil bobbin and each winding in an embodiment of the chamber type transformer according to the present invention. 5, reference numeral 103 denotes a coil bobbin, 103a to 103c denote partition walls, 1041 and 1042 denote movable chamber units,
Numerals 105a to 105f denote chambers, 107a to 107c denote primary windings, and 108a to 108c denote secondary windings. The coil bobbin 103 of the present embodiment is applied to the above-described chamber type transformer as shown in FIG. 1 in the same manner as the conventional coil bobbin 3.

As shown in FIG. 5, the coil bobbin 10
Reference numeral 3 denotes a core (a ferrite core 21a,
22a) into which the cylindrical portion 131 is inserted, and the cylindrical portion 1
A plurality of partition walls 103a to 103 integrally formed with 31
c and movable chamber units 1041 and 1042 mounted in chambers 132 and 133 formed by adjacent partition walls 103a and 103b, and 103b and 103c. Then, as described with reference to FIGS. 1 and 2, the windings (107 a to 107 f) are applied to the respective chambers (105 a to 105 f).
7c, 108a-108c), and
Connecting wires for the primary and secondary windings (61, 6
2) and connection pins (11,
After performing the connection process with the coil bobbin 103, the core core (21 a, 22 a) of each core unit (21, 22) is inserted into the inner portion 130 of the cylindrical portion 131 of the coil bobbin 103. The ferrite core (2) is attached to the chamber type transformer to assemble the chamber type transformer. When a chamber type transformer is used as a switching power supply, a ferrite core is used. For example, when a chamber type transformer is used as a low frequency power supply, an EI core or the like is used instead of the ferrite core to constitute a transformer. Is also good.

In the embodiment shown in FIG. 5, the coil bobbin 103 itself has three partition walls 103a to 103c, and a first partition wall 103a is provided between adjacent partition walls 103a and 103b.
Is formed, and the adjacent partition wall 103b is formed.
A second chamber 133 is formed between the first and second chambers 103 and 103c. However, one chamber is formed by the partition walls 103a and 103c without providing the partition wall 103b, or the number of the partition walls is increased. Thus, the number of chambers originally provided in the coil bobbin 103 may be increased. However, if the number of chambers that the coil bobbin originally has is too large, the number of chambers whose width can be adjusted by the movable chamber unit, which is a feature of the present invention, decreases, and the versatility of the coil bobbin also decreases.

As shown in FIG. 5, in this embodiment, the first chamber 1 is formed by partition walls 103a and 103b.
The movable chamber unit 1041 is mounted in the second chamber 32, and the movable chamber unit 1042 is mounted in the second chamber 133 formed by the partition walls 103b and 103c. Movable chamber unit 1041
And 1042 are movable in the rotation axis direction of the coil bobbin 103 (the axial direction of the cylindrical portion 131), and are formed integrally with the coil bobbin 103.
103c and unit partition walls 1041a and 1041b of the movable chamber units 1041 and 1042;
a and 1042b (105)
a, 105c, 105d, 105f) can be adjusted to an appropriate length. Thereby, by adjusting the width of the chamber according to the volume of each winding, for example,
The height (winding height) of each winding wound on the coil bobbin can be made uniform.

More specifically, in the example of FIG. 5, the movable chamber unit 1041 is mounted substantially at the center of the first chamber 132, and the partition wall 103a of the coil bobbin 103 and the unit partition wall 10 of the movable chamber unit 1041 are provided.
The width of the chamber 105a between the chamber 41a and the unit partition wall 1041b of the movable chamber unit 1041 and the partition wall 103b of the coil bobbin 103 are different from each other.
The width is adjusted to be substantially equal to the width of the line 05c. The movable chamber unit 1042 is mounted at a position deviated from the center in the second chamber 133, and the width of the chamber 105d between the partition wall 103b of the coil bobbin 103 and the unit partition wall 1042a of the movable chamber unit 1042 is movable. The width is adjusted to be wider than the width of the chamber 105f between the unit partition wall 1042b of the chamber unit 1042 and the partition wall 103c of the coil bobbin 103.

In the embodiment shown in FIG. 5, the widths of the chambers 105b and 105e originally included in the movable chamber units 1041 and 1042 remain constant. In FIG. 5, only one movable chamber unit 1041 and 1042 is attached to the first chamber 132 and the second chamber 133, respectively, for the sake of simplicity. Alternatively, a plurality of components having various shapes as shown in FIG. Further, in the embodiment of FIG. 5, the primary winding chambers 105a, 105c, 105e to which the primary windings 107a, 107b, 107c are applied.
And the secondary winding chambers 105b, 105d, and 105f to which the secondary windings 108a, 108b, and 108c are applied are alternately arranged, but the coupling between the primary winding and the secondary winding is reduced. , The primary winding and the secondary winding need not all be arranged alternately. In FIG. 5, the primary windings 107a to 107c or the secondary windings 10a are provided in each chamber.
8a to 108c are wound around the primary windings 107a to 107c or the secondary windings 108a to 108c.
For 108c, all are single windings (one coil)
Instead, if the winding of the windings and the complexity of the insulation work are allowed, for example, a plurality of windings may be concentrically formed in some chambers. However, the primary windings 107a to 107c and the secondary windings 108a to 108
It is better to wind around different chambers in order to ensure safety.

In the above description, the case where the movable chamber unit (1041, 1042) divided into two parts is integrally joined and mounted on the cylindrical portion 131 has been described. For example, the partition walls 103a and 103b are connected to the cylindrical portion. 131
If the movable chamber unit is provided as a single member without being integrally formed with the cylindrical portion 131, for example, the movable chamber unit provided as one member may be fitted on the cylindrical portion 131 from the side from which the partition wall 103a is removed. Can be.

FIG. 6 is a diagram showing an example of a movable chamber unit in the coil bobbin of the chamber type transformer according to the present invention, and FIG. 7 is a diagram showing an example of the movable chamber unit shown in FIG. The movable chamber unit 104 shown in FIG. 6A corresponds to the chamber units 1041 and 1042 used for the coil bobbin in FIG. 5 described above, and FIG. 7A shows the chamber shown in FIG. FIG. 7 is a plan view of the unit 104, and FIG.
FIG. 6B is a front view of the chamber unit 104 shown in FIG. 6 (a) to 6 (d) show cross sections similar to those of the chamber units (1041, 1042) in FIG.

As shown in FIGS. 7A and 7B, the movable chamber unit 104 includes two members 14.
10 and 1420, and the cylindrical portion 131 of the coil bobbin 103 shown in FIG.
420 and two joints 130 at joint 1430
By joining 410 and 1420, the cylindrical portion 1
31 (inside the first chamber 132 and the second chamber 133 of the coil bobbin 103 in FIG. 5). At this time, the movable chamber unit 1
04 is adjusted in the position where the coil bobbin is mounted in the chamber (132, 133) of the coil bobbin, thereby adjusting each chamber (chambers 105a, 105c, 105 in FIG. 5).
d, 105f) can be adjusted.

Here, the mounting hole 140 of the movable chamber unit 104 corresponds to the cylindrical portion 13 of the coil bobbin 103.
Although it is formed in a size corresponding to the outer shape of No. 1, the mounting hole 140 of the chamber unit and the cylindrical portion 131 of the coil bobbin may be fixed to each other by using an adhesive as needed. Alternatively, the movable chamber unit 104 is connected to the coil bobbin chamber (132, 13).
3) After the mounting, the mounting can be ensured by using a tape or the like. Note that the structure of the joint 1430 in the movable chamber unit 104 can employ various known configurations.

The section TP of the unit partition walls 104a and 104b of the movable chamber unit 104 is tapered. This tapered shape is formed by the unit partition walls (104a, 104) of the chamber unit.
Not only the tip portion of b) but also the tip portions of the partition walls of the coil bobbin (the partition walls 103a to 103c in FIG. 5) have the same shape. Further, as shown in FIG. 7A, each partition wall (unit partition walls (104a, 104b) of the chamber unit) and partition walls (103a to 103c; 103b, 103) of the coil bobbin.
c)) have opposing positions (104d, 104d).
e) is provided with a comb-shaped portion, and as described with reference to FIG.
1) and the connection wire (62) for the secondary winding, each connection wire is retained and short-circuited with other connection wires and windings (particularly, with the connection wire and winding on the primary side). A short circuit with the connection wire or the winding on the secondary side is prevented, and the connection is guided to the positions of the connection pin (11) for the primary winding and the connection pin (12) for the secondary winding, respectively. . Note that, as described above with reference to FIG.
The cylindrical portion 131 of the third embodiment is not limited to a cylindrical shape having a circular cross section. For example, the cylindrical portion 131 may be configured to have a square or rectangular cylindrical shape.
The mounting hole 140 may have a shape corresponding to the cylindrical portion 131 in some cases.

As shown in FIGS. 6 (b) to 6 (d), the movable chamber unit includes a chamber unit as shown in FIGS. 6 (a) and 5 and FIGS. 7 (a) and 7 (b). In addition to 104, for example, movable chamber units 141 to 143 having only one unit partition wall can be used. That is, the chamber unit 141 shown in FIG. 6B has an L-shaped cross section, the chamber unit 142 shown in FIG. 6C has a T-shaped cross section, and the chamber unit 143 shown in FIG. Has a deviated T-shaped cross section. By mounting these chamber units 141 to 143 and the chamber unit 104 in various combinations and attaching them to the cylindrical portion (131) of the coil bobbin, the same type coil bobbin can be used to wind various types of chamber type transformers (winding windings). Chamber having a width suitable for
It is possible to minimize the occupied volume of the chamber type transformer by eliminating unnecessary space in each chamber.

FIG. 8 is a view for explaining the leading end portion of each partition wall in the coil bobbin of the chamber type transformer according to the present invention, and FIG. 9 is a diagram illustrating the partition of each movable chamber unit in the coil bobbin of the chamber type transformer according to the present invention. It is a figure showing an example of the concrete structure of a wall. here,
FIG. 8A shows the leading end (cross section) of the partition wall 40a that has not been tapered, and FIG. 8B shows the leading end of the partition wall 400a that has been tapered. In addition,
8A and 8B, reference numerals 7 and 107 indicate primary windings, and reference numerals 8 and 108 indicate secondary windings.

As shown in FIG. 8A, when the taper processing is not performed, the thickness of the partition wall (unit partition wall) 40a is a predetermined value (for example, 1 m) as a safety standard.
m) In the following cases, the value is excluded from the creepage distance. That is, in FIG. 8A, for example, L11 = L13 =
When L12 = 1.0 [mm] at 1.6 [mm], the creepage distance LA1 is LA1 = 1.6 + 0 + 1.6 = 3.
2 [mm]. On the other hand, as shown in FIG. 8B, when the taper process is performed, and specifically, when L22 is set to 0.2 [mm] as shown in FIG.
= L23 = {(1.6) ² + (0.4) ² } ^1/2 << 1.65
[Mm], and the creepage distance LA2 is LA2 = 1.
65 + 0 + 1.65 = 3.3 [mm].

Accordingly, by tapering the cross-sectional shape of the leading end of the partition wall, the creepage distance can be increased by about 3%, and sufficient safety can be ensured with the design (external dimensions) just below the standard. It becomes possible. That is,
Since actual windings have variations, it is necessary to design a coil bobbin with dimensions that determine the maximum value of the variations. However, as in this embodiment, the creepage distance is increased by tapering the tip of the partition wall. A margin of about 3% is obtained for the coil bobbin (chamber type transformer) as a result. Furthermore, the tip (cross section) of this partition wall
Since the taper treatment of the first step increases the opening size of the originally narrow and cramped chamber, the winding operation of the winding is facilitated, and the winding is aligned and wound in each chamber. Since it is useful for maintaining the wire angle given to the wire, it can also contribute to reducing the variation in the winding.

FIG. 10 is a view showing a cross section of a coil bobbin and each winding in a modification of the chamber type transformer shown in FIG. As is clear from the comparison between FIG. 5 and FIG.
In this modification, the partition wall 103 of the coil bobbin 103 '
Second chamber 133 formed between b and 103c
5, a movable chamber unit 1043 having one unit partition wall is provided instead of the movable chamber unit 1042 in FIG. Accordingly, the second chamber 133 is divided into two chambers, a chamber 105e 'around which the primary winding 107c' is wound and a chamber 105d 'around which the secondary winding 108b' is wound. I have.

The movable chamber unit 104 shown in FIG.
Reference numeral 3 denotes a modified version of the movable chamber unit 142 shown in FIG. 7 (c). The movable chamber unit 142 comes into contact with the cylindrical portion 131 of the coil bobbin 103 ', and the windings are wound thereon (corner portions) 1043a to 1043d. A taper is provided to reduce winding disturbance. Other configurations are the same as those in FIG.

FIG. 11 is a view showing a modification of the movable chamber unit shown in FIG. The movable chamber unit 144 shown in FIG. 11A is a modification of the chamber unit 141 shown in FIG.
Tapered portions 4a and 144b are provided to reduce winding disturbance. The movable chamber unit 145 shown in FIG. 11B is, for example, the chamber units 141 and 1 shown in FIGS. 7B and 7C.
43 has two unit partitioning walls as if they were integrated, and each corner is tapered. As is clear from the above description, the movable chamber unit can be variously deformed, and an appropriate taper can be provided at a corner portion in order to prevent winding disturbance or the like.

FIG. 12 is a view showing a modification of the movable chamber unit shown in FIG. 7, and FIG. 13 is a view schematically showing an example of a transformer using the movable chamber unit shown in FIG. As is clear from the comparison between FIG. 7A and FIG. 12, the movable chamber unit 10 of this modification is
In 4 ′, the planar shape of the unit partition wall 104a ′ (104b ′) is not rectangular but circular. Therefore, the comb-shaped portions 104d 'and 1 for passing the connection wire (61) for the primary winding and the connection wire (62) for the secondary winding are passed.
04e 'is also formed with respect to the circular unit partition wall. In addition, this partition wall is made into a circular shape,
Not only the unit partition wall of the movable chamber unit,
The partition wall of the coil bobbin may have the same shape. As shown in FIG. 13, all the partition walls (the unit partition wall of the movable chamber unit and the partition wall of the coil bobbin) have a circular shape, and a short ring 100 is provided so as to cover the outside of the coil bobbin 103 ′ and the ferrite core 2. And noise from the chamber type transformer 1 'can be reduced. In FIG. 13, reference numeral 100 a indicates a welding (solder) portion of the short ring 100 covering the entire outside of the coil bobbin 103 ′ and the ferrite core 2.

FIG. 14 is a cross-sectional view showing a modification of the transformer shown in FIG. 13 and shows a state cut between chambers. As shown in FIG. 14, in the chamber type transformer 1 ″ of this modification, for example, a short ring 100 ′ is formed in advance by a metal plate (copper plate) of a predetermined shape, and the short ring 100 ′ is formed around the transformer. Here, the outer shape of the coil bobbin 103 ″ (movable chamber unit 104) is formed so that the short ring 100 ′ can be easily attached. Thus, the efficiency of the work of attaching the short ring can be improved.

As described in detail above, according to the chamber-type transformer (coil bobbin) according to the present embodiment, the width of each winding is adjusted by adjusting the width of each chamber to an appropriate length using the movable chamber unit. The winding height can be made uniform regardless of the volume. Further, the same coil bobbin can be used for general-purpose chamber type transformers of various specifications. Further, since the arrangement of each winding can be designed according to the necessity of the degree of coupling between the primary winding and the secondary winding, the degree of freedom in designing the transformer can be improved. That is, the number of chambers can be freely designed to be increased or decreased, and the level of leakage inductance and leakage magnetic flux can be freely designed. Further, a single type of coil bobbin (molding die) can support transformers of various specifications (chamber type transformers), and a transformer can be manufactured rationally and economically. Further, the amount of heat generation and heat radiation in each winding (each chamber) can be made uniform, and the size of the transformer can be further reduced.

Further, by making the sectional shape of the tip of each partition wall (the partition wall of the coil bobbin and the unit partition wall of the chamber unit) tapered, it is possible to increase the creepage distance according to safety standards, and to reduce the size of the transformer. In addition, the winding operation of the windings can be facilitated, and the winding disturbance can be reduced to improve the alignment of the windings. In addition, by providing the comb-shaped portions at both ends of each partition wall, it is ensured that the connection wire connecting each winding and the connection pin is held, and a short circuit between the connection wire and another connection wire or the winding (particularly, Short-circuiting between the primary-side connection wires and windings and the secondary-side connection wires and windings) can be prevented, and safety can be improved.

[0043]

As described above in detail, according to the present invention, there is provided a low cost and small occupied chamber type transformer using the same coil bobbin for various types of chamber type transformers. can do.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a conventional chamber type transformer.

FIG. 2 is an exploded perspective view schematically showing a ferrite core in the chamber type transformer of FIG.

FIG. 3 is a perspective view schematically showing one example of each partition wall in the chamber type transformer of FIG.

FIG. 4 is a diagram showing a cross section of a coil bobbin and each winding in an example of a conventional chamber type transformer.

FIG. 5 is a diagram showing a cross section of a coil bobbin and each winding in an embodiment of the chamber type transformer according to the present invention.

FIG. 6 is a view showing an example of a movable chamber unit in the coil bobbin of the chamber type transformer according to the present invention.

FIG. 7 is a view showing one example of a movable chamber unit shown in FIG. 6;

FIG. 8 is a view for explaining a partition wall of each movable chamber unit in the coil bobbin of the chamber type transformer according to the present invention.

FIG. 9 is a view showing an example of a specific structure of a partition wall of each movable chamber unit in the coil bobbin of the chamber type transformer according to the present invention.

10 is a diagram showing a cross section of a coil bobbin and each winding in a modification of the chamber type transformer shown in FIG.

FIG. 11 is a view showing a modification of the movable chamber unit shown in FIG.

FIG. 12 is a view showing a modification of the movable chamber unit shown in FIG.

13 is a diagram schematically showing an example of a transformer using the movable chamber unit shown in FIG.

FIG. 14 is a sectional view showing a modification of the transformer of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Transformer 2 ... Ferrite core 3, 103, 103 '... Coil bobbin 103a-103c ... Partition wall 130 ... Inside cylindrical part 131 ... Cylindrical part 132 ... First chamber 133 ... Second chamber 104, 104', 141- 145,1041,104
2, 1043 ... movable chamber unit 1041a, 1041b, 1042a, 1042b ... unit partition wall 105a to 105f, 105d ', 105e' ... chamber 107a to 107c, 107c '... primary winding 108a to 108c, 108b' ... secondary winding

Claims (13)

[Claims] At least one for winding a primary winding
A coil bobbin for a chamber-type transformer having one primary winding chamber and at least one secondary winding chamber for winding a secondary winding, wherein the primary winding chamber and the secondary winding A coil bobbin for a chamber-type transformer, wherein a line chamber is arranged in a rotation axis direction of the coil bobbin, and a width of the at least one chamber is adjustable. 2. The coil bobbin of the chamber type transformer according to claim 1, wherein the coil bobbin is formed by a cylindrical portion, a plurality of chamber walls provided in the cylindrical portion, and the adjacent chamber wall. A coil bobbin for a chamber-type transformer, comprising: a movable chamber unit having at least one unit chamber wall whose mounting position is adjustable in the rotation axis direction in a chamber. 3. The coil bobbin for a chamber type transformer according to claim 2, wherein the movable chamber unit is a coil bobbin.
A coil bobbin for a chamber-type transformer, comprising two members, wherein the movable chamber unit is mounted so as to cover the cylindrical portion with the two members. 4. The coil bobbin of a chamber type transformer according to claim 2, wherein at least one of a partition wall of the coil bobbin and a unit partition wall of the movable chamber unit is provided at opposite positions on both sides thereof for the primary winding. A coil bobbin for a chamber-type transformer, comprising a comb-shaped portion for the secondary winding. 5. The coil bobbin of the chamber type transformer according to claim 2, wherein at least one of a partition wall of the coil bobbin and a unit partition wall of the movable chamber unit is tapered at a tip so as to extend a creepage distance. A coil bobbin for a chamber-type transformer, comprising: 6. The coil bobbin of a chamber type transformer according to claim 2, wherein the movable chamber unit comprises:
A coil bobbin for a chamber-type transformer, wherein a taper is provided at a corner portion in contact with the cylindrical portion and around which the respective windings are wound. 7. The coil bobbin according to any one of claims 1 to 6, a core having a central core inserted into a cylindrical portion of the coil bobbin, and wires from the respective windings connected to each other. And a connection pin to be connected. 8. The chamber type transformer according to claim 7, wherein a cross section of the center core portion is circular, and a cylindrical portion of the coil bobbin is a cylindrical shape corresponding to the shape of the center core portion. Chamber type transformer. 9. The chamber type transformer according to claim 7, wherein said core is a ferrite core. 10. The chamber type transformer according to claim 7, wherein the partition wall of the coil bobbin and the unit partition wall of the movable chamber unit have a circular planar shape, and a short circuit is formed around the coil bobbin and the ferrite core. A chamber type transformer characterized by being covered with a ring. 11. A chamber type transformer having at least one primary winding chamber for winding a primary winding and at least one secondary winding chamber for winding a secondary winding. A coil bobbin for a chamber type transformer, wherein at least one end of a partition wall separating the respective chambers has a tapered shape to extend a creepage distance. 12. The coil bobbin of the chamber type transformer according to claim 11, wherein at least one of the partition walls has comb-shaped portions for the primary winding and the secondary winding at positions on opposite sides. A coil bobbin for a chamber-type transformer, comprising: 13. The coil bobbin according to claim 11, a core having a central core portion inserted into a cylindrical portion of the coil bobbin, and wires from the respective windings connected to each other. And a connection pin to be connected.