KR100205828B1 - Drum type insulating transformer - Google Patents

Abstract

The present invention relates to a drum type insulating transformer in which insulation between a primary side and a secondary side ground is assured even when the structure is simple and the manufacturing cost is low. The drum-type insulating transformer of the present invention comprises a drum-shaped core, a secondary coil wound directly on the core body, a bobbin provided on the secondary coil, and a primary coil wound on the bobbin, .

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Description

Drum-type insulation transformer

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drum type insulating transformer, and more particularly to a drum type insulating transformer applicable to an A / V connecting terminal of a television receiver.

A semiconductor device for switching a signal input from the outside and a signal generated from the television set itself is usually used for the A / V (Audio / Video) connection of the television receiver. In the switching operation of the semiconductor device, If there is a level difference between the signal of the receiver and the signal of the receiver, there is a possibility that the semiconductor element or the like may be damaged. Therefore, a power source is required to match the bias between the external input signal and the receiver's own signal, and a transformer is used as the power source.

On the other hand, the transformer can be divided into a cold chassis type and a hot chassis type depending on whether the primary side and the secondary side ground are separated. The cold chassis type transformer is a type of transformer in which the ground between the primary side input power source and the secondary side circuit on the load side is separated so that the secondary side circuit does not become an electric shock. The hot chassis type transformer has a primary side input power source It means a transformer in which the ground between the secondary circuits on the load side is not separated, and the electric shock is generated when the chassis on the secondary circuit side is touched. Typical examples of the hot chassis type transformer include a drum type transformer. FIG. 1 is a sectional view showing a structure of a conventional drum type transformer. As shown in Fig. 1, the structure of a conventional drum type transformer is such that a primary bobbin 2 made of an insulator is provided on a drum-shaped core 1, and a primary coil 2 3 are wound. Next, a secondary bobbin 4, which is also made of an insulator, is provided on the primary coil 3, and the secondary coil 5 is wound on the secondary bobbin 4 again.

However, the conventional drum type transformer having the above-described structure has a problem in that it can not be used for the A / V connecting stage because the structure is simple and the manufacturing cost is low while the primary side and the secondary side ground are not insulated .

Accordingly, a cold chassis type transformer is usually used for the A / V connecting terminal of the television receiver.

However, in such a cold chassis type transformer, a drum type EE core or an EI type core is used in order to ensure insulation between the primary side and the secondary side ground, thereby complicating the structure and increasing its size and manufacturing cost There was a problem.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a drum-type insulating transformer which is insulated from the primary and secondary grounds with a simple structure and a low manufacturing cost.

According to an aspect of the present invention, there is provided a drum-type insulating transformer comprising: a drum-shaped core; a secondary coil wound directly on the core body; a bobbin mounted on the secondary coil; And a primary coil wound on the secondary coil.

1 is a sectional view showing the structure of a conventional drum type transformer,

2 is a cross-sectional view showing the structure of a drum-type insulating transformer of the present invention,

FIG. 3 is a view showing the path of magnetism induced in the transformer of FIG. 2,

DESCRIPTION OF THE REFERENCE SYMBOLS

1: core, 2: primary bobbin,

3: primary coil, 4: secondary bobbin,

5: secondary coil, 10: base,

11: drum, 12: secondary coil,

13: bobbin, 14: primary coil,

15: secondary lead, 16: primary lead

Hereinafter, preferred embodiments of a drum-type insulation transformer according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a cross-sectional view showing a structure of a drum-type insulating transformer of the present invention. 2, the structure of the drum type insulating transformer of the present invention includes a base 10 for supporting a transformer, a drum-shaped core 11 placed on the base 10, A bobbin 13 installed on the secondary coil 12 for insulation between the secondary coil 12 and a primary coil 14 to be described later, And a primary coil (14) wound directly on the bobbin (13). In the above-described configuration, the primary coil 14 is connected to a commercial AC power source, and the secondary coil is connected to a secondary circuit acting as a load, for example, an A / V connecting terminal of the television receiver. In FIG. 2, reference numeral 15 denotes a lead wire drawn out from the secondary coil 12, and 16 denotes a lead wire drawn out from the primary coil 14.

Hereinafter, the operation of the drum-type insulation transformer of the present invention will be described in detail.

FIG. 3 is a view showing the path of magnetism induced in the transformer of FIG. 2; 3, in the present invention, since the secondary coil 12 is wound directly on the core 11 and then insulated by the bobbin 13 and the primary coil 14 is wound thereon, The strongest magnetic flux among the magnetic fluxes induced from the coil 14 is induced in the secondary coil 12, thereby increasing the efficiency.

Further, unlike the conventional drum-type transformer, since the secondary coil 12 is directly wound on the core 11, the bobbin is omitted, thereby simplifying the structure and reducing the volume.

In addition, in the present invention, since the secondary coil 12 is wound first, the core 11 acts as a ground of the secondary side, and accordingly, there is a risk of electric shock caused by winding the primary coil in the prior art.

The present invention is not limited to the above-described embodiments, and various modifications may be made within the scope of the technical idea of the present invention.

According to the drum-type insulation transformer of the present invention as described above, since the secondary coil is directly wound on the core and then the primary coil is wound thereon, the structure is simplified, the volume is reduced, There is an effect.

Claims (1)

A drum type insulated transformer comprising a core in a drum shape, a secondary coil wound directly on the core of the core, and a primary coil wound on the bobbin, the bobbin being formed on the secondary coil, .