JPH058658Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is a common mode noise filter for eliminating common mode noise that invades electronic equipment and electronic circuits, especially noise that invades through small current data lines. Concerning improvement of mode chyo coil.

[Conventional technology]

Conventionally, a common mode choke coil for removing common mode noise is known. As shown in FIG. 3, the conventional common mode York coil has two windings 81 and 82 wound around each half of a ring-shaped magnetic core 9, and the current flowing through each winding causes the ring-shaped magnetic core to be coiled. It was constructed so that the magnetic flux within the magnetic core canceled each other out.

[Problem that the invention attempts to solve]

In conventional common mode York coils that have a ring-shaped magnetic core, the magnetic core is ring-shaped, so in order to wind the winding around this magnetic core, the winding must be inserted into the ring for each turn. Line work takes a lot of man-hours. Furthermore, it is difficult to make the device extremely compact and thin, and other problems cannot be avoided.

The present invention aims to provide a common mode choke coil that eliminates such drawbacks.

[Means for solving problems]

In this invention, spiral coils, which are formed by forming two opposing spiral patterns using conductors on an insulating sheet, are housed in a magnetic core, and lines are arranged so that the magnetic fluxes generated in each coil cancel each other out. By connecting the coils, it is possible to omit the step of winding the windings, and to provide a common mode choke coil which can be made smaller and thinner as a whole.

〔Example〕

Examples of the present invention will be described below.

FIG. 1 is a plan view of a spiral coil according to the present invention. A circular insulating sheet 5 having terminal tongues 51 on both sides and a crescent-shaped hole 52 in the center.
A pair of spiral conductive patterns 6, 6 are formed thereon. The spiral conductive patterns 6, 6 have outer ends connected to a pair of terminals 21, 22 formed on one terminal tongue piece 51, and inner ends connected to through holes whose inner walls are conductively coated. 3, 3 to the back side of the insulating sheet 5. A pair of spiral conductive patterns connected to the conductive parts of the through holes 3 and 3 are similarly formed on the back side of the insulating sheet 5, and the outer peripheral ends of these conductive patterns are connected to the other terminal tongue piece. A pair of terminals 41 and 42 formed on the through hole 51 are connected in a similar structure to the through hole 3. Of course, the conductive pattern on the back side may be extended as it is to the positions corresponding to the terminals 41 and 42 without forming it into a spiral shape.

As shown in FIG. 2, this spiral coil 1 is housed in a pot-shaped magnetic core made up of magnetic cores 71 and 72. When stored, the central column of the magnetic core 71 having a crescent-shaped cross section is fitted into the hole 52 of the spiral coil 1, thereby preventing the spiral coil 1 from rotating. Terminals 21, 22 and terminal 4 protruding from the pot-shaped magnetic core
By connecting signal lines to 1 and 42 so that the magnetic fluxes from the two coils cancel each other out,
A common mode choke coil is constructed.

[Effects of the invention] According to the invention, since it does not rely on winding, it is essentially easy to make it thinner and smaller, and there is no need for winding work such as inserting the wire into the ring for each turn. Therefore, it is possible to significantly reduce manufacturing man-hours, and the process can be easily automated.

The shape of the magnetic core is not limited to the pot shape, but may be rectangular or other shapes, and a plurality of spiral coils may be housed in the magnetic core.

[Brief explanation of the drawing]

Figure 1 is a plan view of the coil section of a common mode chain coil showing an embodiment of the invention, Figure 2 is an exploded perspective view of the common mode chain coil according to the invention, and Figure 3 is a conventional common mode chain. Schematic diagram of a yoke coil. 1... spiral coil, 21, 22... terminal, 3...
...Through hole, 41, 42...Terminal, 5...Insulating sheet, 6...Conductor pattern, 71, 72...Magnetic core.

Claims (1)

[Scope of utility model registration request] A common mode coil is characterized in that the spiral coil is formed by forming a pair of opposing spiral patterns using a conductor on an insulating sheet, the spiral coil having a rotation-preventing hole in the center of the insulating sheet through which the central support of a pot-shaped magnetic core is inserted, the spiral coil is housed within the pot-shaped magnetic core, and the magnetic fluxes generated in each coil are connected to lines so as to cancel each other out.