JPH0546256Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to improving the processing method for electrostatic shielding of transformer coils.It simplifies the processing of the shield around the outer periphery of the coil and produces a small, inexpensive transformer with good noise attenuation efficiency. This article relates to the structure of the transformer coil bobbin and shield cover, and its main components will be explained.

As shown in this figure, in a transformer with a coil structure in which two or more coils are connected, the two identical coils are molded using a conductive material in a shape that surrounds one end 2 of the coil bobbin flange portion and the outer peripheral surface 5 of the coil. A transformer coil shield cover 3 is attached to a coil bobbin 1 in a shape corresponding to each coil. In addition, a convex portion 4 is provided on a part of the flange so that each shield cover can be installed insulated.
This transformer coil bobbin structure is characterized in that the end face of the shield cover installed from above and below comes into pressure contact with the outer periphery of the coil bobbin flange, and is installed without contacting the corresponding shield cover.

Conventionally, when applying electrostatic shielding to a transformer coil, shielding was performed using a metal plate, metal foil, metal tape, etc. after each coil winding, but shielding was performed during the winding process. A considerable amount of manual labor was required to process the shield, and the finished coil also had the disadvantage of becoming bulky due to the insulating material.

Practical examples of the transformer coil bobbin and shield cover of the present invention will be explained using figures.

The shield cover 3 of the present invention is placed and fixed over the coil block and bobbin 1 whose outer peripheries are insulated using the bobbin grooves, and the wall conductive portion of the shield cover 3 is in contact with the opposing wall surface portion of each coil block. Structure. As a result, the coil blocks are coupled only magnetically through the iron core, but electrostatically the coil blocks are completely shielded by the conductive properties of the shield cover and the iron core.
Further, since each coil block is constructed with two shield covers 3 and each coil block is insulated and maintained, a stable shielding effect can be achieved without creating an electrically closed circuit. Regarding the manufacturing method of the shield cover, automatic continuous processing such as press punching and drawing is easy, and the conventional shield processing requires manual labor such as taping, hand-rolling, gluing of conductive metal material strips, and insulation treatment. It can be connected to an automatic production line at the same time as winding processing without having to worry about wire winding, and it efficiently exhibits noise shielding effects electromagnetically and electrostatically, and there is no variation in individual performance or variation in structural dimensions. , it is possible to manufacture a small transformer with stable and good noise attenuation characteristics, and this is an industrially useful idea.

[Brief explanation of the drawing]

FIG. 1 is a perspective view. 3 in FIG. 1 is the shield cover of the present invention, which is attached to the coil bobbin 2 from above and below. Reference numerals 1, 2, 4, and 5 are diagrams in which a plurality of coil bobbins are connected. 1 is a flange portion of the coil bobbin, 4 is a convex portion of the coil bobbin flange portion, and 5 is an outer peripheral surface of the coil.

Claims (1)

[Scope of utility model registration request] In a transformer with a coil structure in which two or more coils are connected, one end 2 of the coil bobbin flange part
The transformer coil is molded using a conductive material into a shape that surrounds the outer peripheral surface 5 of the coil, and is characterized in that two of the transformer coils have the same shape and can be mounted from above and below the coil bobbin 1 so as to correspond to one coil each. The shield cover 3 is attached to the bobbin 1 of the transformer coil, which has a convex portion 4 provided on a part of the flange so that each shield cover 3 can be installed insulated, and the end face of the shield cover 3 is attached to the coil bobbin. The structure of the transformer coil bobbin 1 and shield cover 3 is characterized in that the bobbin 1 and the shield cover 3 are in pressure contact with the outer periphery of the flange and are attached without contacting the corresponding shield cover 3.