KR20170105139A

KR20170105139A - Excellent heat dissipation planar printed circuit board type transformer

Info

Publication number: KR20170105139A
Application number: KR1020160027474A
Authority: KR
Inventors: 박동식; 정은재
Original assignee: (주)코러싱
Priority date: 2016-03-08
Filing date: 2016-03-08
Publication date: 2017-09-19
Also published as: KR101821177B1

Abstract

The present invention relates to a thin film transformer, and more particularly, to a thin film transformer having a pair of cores in which a core shaft is protruded so as to have a tubular space therein, and a core portion having a connection hole opened to expose a part of the space, ; A transformer comprising a circuit board laminated in the core in accordance with the amount of change, and an insulating plate interposed between the circuit boards and shielding the transformer; And a heat sink interposed between the insulating plates to radiate heat generated from the circuit board to the outside to cool the heat sink.
Accordingly, the present invention has the effect of rapidly dissipating heat generated in the core by heat radiating plates interposed between circuit boards, minimizing power loss due to heat generation and providing stability.

Description

(Excellent heat dissipation planar printed circuit board type transformer)

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer using a printed circuit board, and more particularly, to a generator capable of reducing the size and weight of a transformer by stacking a substrate on which coils are printed with a primary coil substrate and a secondary coil substrate.

Usually, a transformer is used as an electronic device for raising or lowering an AC voltage. Such a transformer has an insulation gap between the primary and secondary coils, and the voltage induced in the secondary coils is sized according to the voltage applied to the primary coils and the turns ratio of the primary coils and the secondary coils.

Conventional transformers are not suitable for use in thin and light electronic products because the size of a core or bobbin on which coils are wound is large and heavy, and a transformer in which a coil pattern is formed on a printed circuit board is used.

For example, Korean Patent Laid-Open Publication No. 10-2011-0138576 and Korean Patent Laid-Open Publication No. 10-2014-0117835 disclose a transformer manufactured by a printed circuit board. These transformers are manufactured by assembling a plurality of printed circuit boards on which the first coil pattern and the second coil pattern are formed, with core portions provided on the upper and lower sides. The transformer having such a structure does not require a coil winding operation by forming a coil pattern on a printed circuit board, and the size and volume of the element can be reduced due to the coil pattern printed on the plane.

Such a transformer generates heat proportional to the action of the coil, and has a structure in which a plurality of printed circuit boards can not properly emit heat generated when the printed circuit board is embedded in a sealed state in the core portion. Therefore, power loss due to overheating occurs, and the lifetime is shortened due to a decrease in self-durability.

Korean Patent Laid-Open No. 10-2011-0138576 entitled "Planar Transformer" Korean Patent Laid-Open Publication No. 10-2014-0117835 "Transformer manufactured by printed circuit board"

Accordingly, it is an object of the present invention to provide a thin film transformer in which a heat sink is interposed to rapidly dissipate heat generated from a circuit board.

In order to achieve the above object, the present invention provides a thin film transformer, comprising: a pair of cores having a core shaft protruded to provide a tubular space therein; and a core portion having a connection port opened to expose a part of the space, ; A transformer comprising a circuit board laminated in the core in accordance with the amount of change, and an insulating plate interposed between the circuit boards and shielding the transformer; And a heat sink interposed between the insulating plates to radiate heat generated from the circuit board to the outside to cool the heat sink.

In this case, the circuit board according to the present invention has a substrate on which a core hole corresponding to a core axis is formed at the center, a coil having a conductive material printed on the one surface of the substrate by a spiral, Is protruded.

According to another aspect of the present invention, there is provided a heat sink comprising: a heat collecting plate having a mounting hole corresponding to a core shaft at a center thereof and collecting heat generated in a coil, And a cooling piece which is extended and discharges the collected heat to the outside.

Further, the cooling piece according to the present invention is further characterized in that one or more heat dissipation holes for increasing the flow velocity of the air to be contacted are further formed.

The heat dissipation plate according to the present invention is characterized in that a gap is formed in the mounting hole so as to prevent short-circuiting of the eddy current generated on the heat collecting plate.

It should be understood, however, that the terminology or words of the present specification and claims should not be construed in an ordinary sense or in a dictionary, and that the inventors shall not be limited to the concept of a term It should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be properly defined. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention, and not all of the technical ideas of the present invention are described. Therefore, It is to be understood that equivalents and modifications are possible.

As described in the above construction and operation, the present invention rapidly dissipates the heat generated in the core by the heat radiating plate interposed between the circuit boards, minimizing power loss due to heat generation, Thereby providing an effect of ensuring overall durability and stability by interposing an insulating plate.

1 is a perspective view showing a transformer according to the present invention;
2 is a cross-sectional view showing the transformer according to the present invention in an incision;
3 is an exploded view of a transformer according to the present invention.
FIG. 4 and FIG. 5 are schematic diagrams showing the main part of the transformer according to the present invention. FIG.
6 is a perspective view showing a modified example of the transformer according to the present invention.

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

The present invention relates to a transformer using a printed circuit board and includes a core portion composed of a pair of cores 10 and a connection portion 15 as shown in Figs. 1 and 2, a transformer portion composed of a circuit board 20 and an insulating plate 25 And a heat sink (30) for cooling the core portion and the transformer portion by releasing heat.

The core unit according to the present invention includes a pair of cores 10 with a core shaft 11 protruding therefrom so as to have a tubular space therein as shown in FIG. 3, a connector 10 15 are formed. The core 10 accommodates the circuit board 20, the insulating plate 25, and the heat radiating plate 30 and is formed of a material containing magnetic powder or ferrite to help form a magnetic field on the built-in circuit board 20 . The connecting hole 15 guides the terminal 23 of the circuit board 20 and the cooling plate 35 of the heat sink 30 to the outside. These connectors 15 are sized, positioned and numbered according to the terminal 23 and the cooling piece 35 to be exposed from the core 10.

The transformer according to the present invention includes a primary circuit board 20 laminated in a plurality of cores according to the amount of change in the core 10 as shown in Figs. 2 and 3, and an electromotive force induced by the magnetic field of the primary circuit board 20 And an insulating plate 25 which is interposed between the circuit board 20 and the secondary circuit board 20 and shields the circuit board 20.

4, the circuit board 20 includes a substrate 21 having a core shaft 11 and a corresponding core hole 21a formed at the center thereof, and a coil 22 made of a conductive material on one surface or both surfaces of the substrate 21 And a terminal 23 connected to the coil 22 and connected to the outside is protruded on one side or both sides. The substrate 21 may be made of a thermosetting resin such as phenol resin or epoxy resin so as not to bend well and may be made of a thermoplastic resin such as polyamide or polyester so as to be easily bent.

The coil 22 is a layer in which a coil pattern is formed on one surface or both surfaces of the substrate 21, and corresponds to a coil wound on an existing bobbin and generates a magnetic path for generating electromagnetic induction. In order to form such a magnetic path, a conductive paste such as a metal foil such as a copper foil, a silver foil or an aluminum foil or an ink in which a metal oxide is dispersed may be used.

When a metal foil is used, a winding pattern can be formed by a photolithography method using a photomask and an etching solution, and a winding pattern can be formed using a printing electron method such as a screen printing method when a conductive paste is used. The winding pattern may be formed in a circular shape, an elliptical shape, or a polygonal shape having a starting point and an ending point around the core hole 21a.

The terminal 23 electrically connects the primary circuit board 20 and the secondary circuit board 20 to an external circuit and is formed as a terminal hole 23a through which the inner wall surface is coated with a conductor. The terminal holes 23a are formed at the end points of the winding patterns of the primary circuit board 20 and the secondary circuit board 20 which are not connected to each other, and a separate terminal pin is inserted and electrically connected.

The insulating plate 25 is formed of an insulating material so as to cover and protect the coil 22 exposed on one side of the circuit board 20. [ It is preferable that the thickness of the insulating plate 25 is 60 to 100% of the thickness of the coil 22. For example, when the thickness of the coil 22 is 10 m, if the thickness of the insulating plate 25 is less than 16 m, there is a fear that the coil 22 is too thin and the thickness of the insulating plate 25 is 20 Mu] m, there is a problem that the total volume of the transformer 100 is increased.

In addition, the heat sink 30 according to the present invention intervenes between the insulating plates 25 as shown in FIG. 3 to cool the circuit board 20 by discharging the heat generated from the circuit board 20 to the outside. The heat radiating plate 30 is preferably made of an aluminum-based material having excellent heat conductivity and excellent workability.

5, a mounting hole 31a corresponding to the core shaft 11 is formed at the center of the heat sink 30, and at least a size of the circuit board 20 is formed to accommodate the circuit board 20, And a cooling piece 35 which extends to the outside of the connecting hole 15 from the heat collecting piece 31 and discharges the collected heat to the outside. That is, the heat collected in the heat collecting piece 31 is transferred to the cooling piece 35, and the heat transferred to the cooling piece 35 is transferred to the contact air.

At this time, it is preferable that the cooling piece 35 further includes at least one heat radiating port 35a for increasing the flow velocity of air to be contacted as shown in FIG. 6A. The cooling performance depends on the speed at which the heat transferred to the cooling piece 35 is transferred to the air, which is proportional to the flow rate of the air. That is, the heat radiating port 35a changes the direction of the air flowing on the surface of the cooling piece 35 (vortex) to increase the flow velocity, thereby improving the cooling performance.

Of course, if the heat dissipation protrusion 35b is formed on the cooling piece 35 together with the heat dissipation port 35a, the cooling performance can be maximized. It is preferable that the heat dissipating plate 30 has a gap 37 cut to the mounting hole 31 so as to prevent a short circuit of the eddy current generated on the heat collecting piece 31.

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 as defined by the appended claims. It is therefore intended that such variations and modifications fall within the scope of the appended claims.

10: core 11: core shaft
15: connection 20: circuit board
21: substrate 21a: core hole
22: coil 23: terminal
23a: terminal hole 25: insulating plate
30: heat sink 31:
31a: mounting hole 35: cooling piece
35a: heat dissipation hole 35b:
37: Pore 100: Transformer

Claims

A thin film transformer comprising:
A core portion having a pair of cores protruding with a core shaft so as to have a tubular space therein, and a connecting portion having a connection portion opened to expose a part of the space;
A transformer comprising a circuit board laminated in the core in accordance with the amount of change, and an insulating plate interposed between the circuit boards and shielding the transformer; And
And a heat radiating plate interposed between the insulating plates to radiate heat generated from the circuit board to the outside to cool the thin plate transformer.

The method according to claim 1,
Wherein the circuit board has a substrate on which a core hole corresponding to a core axis is formed at the center, and a coil of a conductive material is printed on one surface of the substrate with a spiral, and terminals are connected to the coil, Thin film type transformer excellent in heat dissipation.

The method according to claim 1,
The heat sink includes a heat collecting plate having a mounting hole corresponding to a core shaft at a center thereof and having a size to accommodate at least a circuit board to collect heat generated in the coil, Wherein the cooling plate is formed of a cooling piece which is discharged to the outside.

The method of claim 3,
Wherein the cooling piece further comprises one or more heat dissipation holes for increasing the flow rate of the air to be contacted.

The method of claim 3,
Wherein the heat dissipation plate has a gap formed to a mounting hole so as to prevent a short circuit of an eddy current generated on the heat collecting plate.