KR20180115870A - Split bobbin construction for SMPS transformer - Google Patents

Abstract

According to the present invention, a split bobbin to be applied to an insulation type resonance transformer, a primary winding (21) and a secondary winding (22) on the bobbin (20) are supported in an electromagnetic insulation state by a flange (26) that is an insulator and an insulation means (30). A primary partition wall (31) of the insulation means (30) connects the flange (26) arranged on both ends of the primary winding (21) and a secondary partition wall (32) of the insulation means (30) connects the flanged (26) arranged on both ends of the secondary winding (22). Accordingly, while reflecting a light and thin design of a transformer for an SMPS, the bobbin can be easily applied to a circuit requiring a standard distance with a high voltage. Semi-permanent durability can be exhibited through the complete separation of primary and secondary sides.

Description

Split bobbin construction for SMPS transformer for transformer of power supply

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer, and more particularly, to a separate bobbin structure for a transformer of a power supply unit for performing main functions in an SMPS (Switching Mode Power Supply) mounted in various electronic apparatuses.

Generally, a transformer for SMPS is a device that converts AC voltage / current of high frequency by using electromagnetic induction phenomenon. The transformer is composed of a main core, which is a magnetic body, a bobbin for insulation and winding, and a copper wire. The copper wire is wound on a bobbin to be used as an inductor having an inductance required in a circuit, It is used as a transformer that converts the voltage of the primary side to the secondary side with two or more pairs of coils.

These transformers are recognized as important design elements in various electronic devices in order to meet the light and thin structure as an integral part of the power supply (SMPS).

Prior art documents which can be referred to in this connection include Korean Patent Laid-Open Publication No. 2015-0050025 (Prior Art 1), Korean Patent Registration No. 1387512 (Prior Art 2), and the like.

Prior Art 1 is a bobbin having a terminal fastening portion to which an external connection terminal to which a lead wire of a coil is connected is fastened; And a core coupled to the bobbin and electromagnetically coupled to the coil, wherein the bobbin includes a spacing block protruding between the external connection terminals and the core to extend the creepage distance. Therefore, even if the coil part is manufactured in a small size, the effect of securing the insulation distance and creepage distance is expected.

The prior art 2 has an insulating partition wall formed so as to have a predetermined spacing distance between the primary bobbin and the secondary bobbin; A bulkhead holder for fixing the insulating barrier to at least one of the primary bobbin and the secondary bobbin; And a fixing protrusion which is located at an end of the partition wall holder and in which the partition wall holder is fixedly mounted to at least one of the primary and secondary bobbins. Thus, the effect of simplifying the manufacturing process, lowering the manufacturing cost, and dissipating heat is expected.

However, according to the separating block of the prior art document 1 and the insulating barriers of the preceding document, it is difficult to satisfy the performance and the durability in a product which is small and high pressure is applied.

1. Korean Patent Laid-Open Publication No. 2015-0050025 entitled "Coil Parts" (Published on May 20, 2015). 2. Korean Patent Publication No. 1387512 entitled "Transformer for Inverter" (Open date: Apr. 20, 2009).

SUMMARY OF THE INVENTION It is an object of the present invention to overcome the above-mentioned problems of the related art by providing a power supply device capable of maintaining a good insulation property over a long period of time even when a high- And to provide a separate bobbin structure for a transformer.

In order to achieve the above object, the present invention provides a separable bobbin for use in an insulation type resonant transformer, comprising: a primary winding and a secondary winding on a bobbin are supported in an electromagnetic insulation state by a flange and an insulating means, The primary partitions of the insulation means connect the flanges disposed at both ends of the primary winding and the secondary partitions of the insulation means connect the flanges disposed at both ends of the secondary winding.

As a detailed configuration of the present invention, the bobbin may be formed as an integral structure of a "d" -shaped cross section including a primary partition and a secondary partition, or may have a structure of at least one of a box-shaped cap and a " And the first barrier rib and the second barrier rib are disposed on opposite sides of each other.

In the detailed construction of the present invention, the primary barrier rib and the secondary barrier rib are formed in a dimension range that maintains a minimum separation distance of 0.4 mm between the primary winding, the secondary winding, and the lead wire.

According to a modification of the present invention, the insulating means further comprises an intermediate partition wall on a flange interposed between the primary partition wall and the secondary partition wall.

According to another modification of the present invention, the insulating means further comprises at least partly a heat dissipating protrusion, and further comprises a coating layer of at least partly insulating material.

INDUSTRIAL APPLICABILITY As described above, according to the present invention, it is easy to apply to a circuit requiring a standard distance at a high pressure while reflecting the design of a SMPS for a SMPS transformer, and has an effect of exhibiting semi-permanent durability through complete separation of primary and secondary .

1 is a schematic view showing a separate bobbin structure for a transformer of a conventional power supply apparatus.
2 is a view for explaining insulation characteristics of a general separable bobbin.
3 is a schematic view schematically showing a bobbin structure according to the present invention.
4 is a schematic view showing an example of a detailed structure of a bobbin according to the present invention.
Fig. 5 is a schematic view showing the insulation characteristic of the bobbin structure according to the present invention
6 is a schematic view showing a bobbin structure according to a modification of the present invention

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

The present invention proposes a separate bobbin for application to an insulated resonant transformer. Among the power supply units, the resonant type power supply circuit (LLC resonance) is widely used for TV recently with excellent efficiency. Resonant power supply circuit uses a resonant transformer and has a separate bobbin for winding copper wire.

In order to induce less leakage inductance, a common transformer adopts a method of winding the same in one bobbin space so that the primary side winding and the secondary side winding of the power circuit can be formed as a combined structure. On the other hand, referring to the entire state and partially removed state of FIGS. 1 (a) and (b), a resonant transformer requires a large leakage inductance in the resonant power supply circuit, and the resonant transformer has a primary winding 21 and a secondary winding 22 The bobbin 20 having a concentric separable flange 26 is used to keep the bobbin 20 separate from each other.

1 illustrates a resonant transformer in which a bobbin 20 is installed in a central portion 11 of an E-type core 10 including a center rod 11 and a side wall 12, but the present invention is not limited thereto.

The present invention is characterized by a structure in which the primary winding 21 and the secondary winding 22 on the bobbin 20 are supported in an electromagnetic insulated state by a flange 26 which is an insulator and an insulating means 30. Referring to FIG. 2 (a), the separable bobbin 20 should satisfy the standard distance (creepage distance, space distance) between the primary winding 21 and the secondary winding 22 required by the safety standard. Conventional resonant transformers have a problem that they must be largely manufactured to separate the primary and secondary windings by the creeping distance calculation method of the insulating transformer shown in Fig. 2 (b). Fig. 2 (c) shows the standard distance (creepage distance, space distance) between the primary and secondary windings required in a certain safety standard.

3, the present invention is based on isolation means 30 associated with the flange 26 of the bobbin 20, which reduces the size of the resonant transformer and provides a separate bobbin structure .

According to the present invention, the primary partition 31 of the insulation means 30 is connected to the flanges 26 disposed at both ends of the primary winding 21 and the secondary partition 32 of the insulation means 30 Connect the flanges 26 disposed at both ends of the secondary winding 22. The insulation means 30 of the present invention is provided between the lead wire 28 drawn out to the terminal block 24 for connecting the primary winding 21 and the secondary winding 22 and the flange 26 adjacent to the lead wire 28 The primary partition wall 31 and the secondary partition wall 32 are provided to secure safety standard distances for the primary winding 21, the secondary winding 22, and the like. The bobbin 20 and the insulating means 30 are formed of an electromagnetic insulating material but are not necessarily of the same type.

As a detailed configuration of the present invention, the bobbin 20 may be formed as an integral structure of the " d "magnetic cross-section including the primary partition 31 and the secondary partition 32 or an overlapping structure of independent" And the first barrier rib 31 and the second barrier rib 32 are disposed on opposite sides of each other. 3, the first barrier rib 31 connects two flanges 26 adjacent to the path through which the lead wire 28 of the secondary winding 22 passes, and the secondary barrier rib 32 is connected to the primary winding 21 The two flanges 26 adjacent to the upper side of the path through which the lead wires 28 of the fuel cell stack 2 are passed. If the bobbins 20 of the "d" -shaped end face are arranged by disposing the partition walls 31 and 32 opposite to the lead wires 28 of the windings 21 and 22 as described above, Thereby preventing an increase in the size of the bobbin 20 and an increase in the size of the transformer.

At this time, the bobbin 20 indicated by the "d" cross section in the drawing may be formed as one integral structure, or may be formed of at least one of a box-shaped cap and a "

4 illustrates a detailed structure of the insulation means 30 in detail. As shown in Fig. 4 (a), a plate-shaped plate having a cut groove 30a, a plate-shaped plate having a fitting groove 30b as shown in Fig. 4 (b), or a combination thereof. 4 (c) shows a state in which the structure of FIG. 4 (a) is applied to the secondary barrier 32. FIG. 4 (d) (31).

In the detailed configuration of the present invention, the primary partition wall 31 and the secondary partition wall 32 maintain a minimum separation distance of 0.4 mm between the primary winding 21, the secondary winding 22, and the lead wire 28 And is formed in a dimension range. 5 (a), when the conventional bobbin 20 is employed, the primary winding 21 is maintained at a minimum creepage distance of 4 mm by the flange 26 between the primary winding 21 and the secondary winding 22, A minimum space distance of 4 mm is required between the upper drawing line 28 and the upper drawing line 28. 5 (b), the bobbin 20 of the present invention is spaced apart by a distance of not more than 4 mm from the space (creepage distance), and spaced by only 0.4 mm corresponding to the minimum thickness of the flange 26 and the partitions 31 and 32 The design of the windings and bobbins can be optimized in terms of safety standards.

Since the standard distance between the core 10, the primary winding 21, the primary winding 21 and the lead wire 28, which is required to be 4 mm or more, needs to be 0.4 mm or more, the size of the bobbin and transformer Can be reduced. Further, in order to maintain the standard distance, it is not necessary to use a tape (not shown) for securing a space for winding, which makes it possible to improve the productivity due to the manufacture of the transformer.

In this case, the separable bobbin 20 has a thickness of 0.4 mm or more in the thickness of the insulating material when using a 220Vac commercial power source approved by the safety standards IEC60650 and IEC60950, and the primary-secondary connection portion has a primary barrier 31, And the primary barrier rib 31 as shown in Fig. However, in consideration of heat dissipation, productivity, and the like as shown in the example of Fig. 3, a binding body, an adhesive, and the like are added.

As a modification of the present invention, the insulating means 30 further includes an intermediate partition wall 35 on a flange 26 interposed between the primary partition wall 31 and the secondary partition wall 32 do. 6 illustrates a state in which four intermediate ribs 35 are symmetrically formed on the flange 26 located between the primary barrier rib 31 and the primary winding 21. The intermediate partition 35 is advantageous when applied to the primary winding 21 and the secondary winding 22, but is not limited thereto. It is preferable that the protruding length (width) of the intermediate partition wall 35 is 4 mm or more. When the intermediate partition wall 35 extends to a wider range, it can be formed into a box shape as shown in FIG. 4 (a).

In another modification of the present invention, the insulation means 30 further comprises at least partly a heat radiating protrusion 40, and further comprises a coating layer of at least partly insulating material. The heat dissipating protrusions 40 are protruded to a certain size to perform the same function as the heat dissipating fin. The insulating material is partially coated on the primary partition 31, the secondary partition 32, and the intermediate partition 35. The heat dissipating protrusions 40 and the insulating coating layer may be partially formed depending on the use of the transformer. The insulating coating layer is not limited to the coating method but also includes a method of filling the insulating resin in the gap. For ease of molding, filling of insulating resin is essential when the heat dissipating protrusion 40 has a through hole.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. It is therefore intended that such variations and modifications fall within the scope of the appended claims.

10: core 11: central band
12: side face 20: bobbin
21: primary winding 22: secondary winding
24: Terminal block 26: Flange
28: lead wire 30: insulating means
31: primary partition 32: secondary partition
35: intermediate diaphragm 40: heat dissipating projection

Claims (5)

A removable bobbin for use in an insulated resonant transformer comprising:
The primary winding 21 and the secondary winding 22 on the bobbin 20 are supported in an electromagnetic insulation state by a flange 26 which is an insulator and an insulating means 30,
The primary partition 31 of the insulation means 30 connects the flanges 26 disposed at both ends of the primary winding 21,
Wherein a secondary partition wall (32) of the insulation means (30) connects a flange (26) disposed at both ends of the secondary winding (22). The method according to claim 1,
The bobbin 20 may be formed as an integral structure of a "d" -shaped cross-section including a primary partition 31 and a secondary partition 32, or may be formed as an integral structure of at least one of a box-shaped cap and a " , And the primary barrier rib (31) and the secondary barrier rib (32) are disposed on opposite sides of each other. The method according to claim 1,
The primary barrier rib 31 and the secondary barrier rib 32 are formed in a dimension range that maintains a minimum separation distance of 0.4 mm between the primary winding 21, the secondary winding 22 and the lead wire 28 A separate bobbin structure for a transformer of a power supply. The method according to claim 1,
Characterized in that the insulating means (30) further comprises an intermediate partition wall (35) on a flange (26) interposed between the primary partition wall (31) and the secondary partition wall (32) Detachable bobbin structure. The method according to claim 1,
Characterized in that said insulating means (30) further comprises at least partly a radiating projection (40) and further comprises a coating layer of at least partly insulating material.

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