JPH0744006Y2 - Line filter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a line filter, and more particularly to a line filter for preventing radiation noise generated from a signal line connecting digital devices.

[Prior Art] As one means for preventing radiation noise generated from signal lines connecting digital devices, it is effective to use a ferrite core for all signal lines and perform in-phase winding.

As a conventional example, as shown in FIG.
After winding 5e on the coil bobbin, the two U-shaped ferrite cores 4 are butted against each other from above and below the coil bobbin 6 so as to form a closed magnetic circuit, and the two cores are insulated tape or core holder (neither is shown). It is a structure to be joined with.

[Problems to be solved by the invention] However, as shown in Fig. 5, after the coil bobbin 6 is provided with the winding wire 5e, the U-shaped ferrite cores 4, 4 must be butted one by one, and There is a problem that it takes time to perform the matching work.

Moreover, once the line filter is manufactured, the winding cannot be added without separating the cores one by one, which makes it difficult to adjust the characteristics.

Therefore, the technical problem of the present invention is to obtain a line filter that does not require a core matching operation and enables additional adjustment of characteristics.

[Means for Solving the Problems] The line filter of the present invention is a line filter in which a magnetic core is provided with a plurality of windings, and the magnetic core has an annular shape for passing the plurality of windings. A line filter is obtained which is characterized by being mounted on a DIP module type terminal block.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of the present invention.

A line filter according to an embodiment of the present invention is a flat plate-shaped DIP having pin terminals and a main body in which an in-phase winding 5c is connected to three or more signal lines (four in the figure) on an elliptic ring-shaped ferrite core 3.
It is made by placing the module type terminal block 1 vertically.
The vertical placement means that the outer peripheral surface of the elliptical annular ferrite core is in contact with the terminal block 1. The lead wires at the ends of the windings are connected to pin terminals provided on the terminal block 1.

On the other hand, FIG. 2 is a perspective view showing a second embodiment of the present invention. This is made by placing the main body of the line filter shown in FIG. 1 in which the winding 5d of the same phase with four signal lines is horizontally placed on the elliptic annular ferrite core 3 and placed on the terminal block 1. The horizontal placement means that the end surface of the ferrite core 3 and the terminal block 1 are in contact with each other.

As described above, in these embodiments, by using the annular ferrite core having the elliptical cross-sectional shape, the line filter body can be stably installed on the terminal block and the winding can be easily performed.

As another comparative example of the line filter of the present invention, as shown in FIGS. 3 and 4, a cylindrical ferrite core 2 is provided with windings 5a or 5b, which is placed on the DIP module type terminal block 1, It is made by connecting the ends of the windings 5a or 5b to the terminals provided on the DIP module type terminal block 1. At this time, the annular ferrite core 2 is placed vertically on the DIP module type terminal block 1 so that the outer peripheral surface of the annular core contacts the terminal block as shown in FIG. 3 and the end surface of the annular core as shown in FIG. Place it horizontally so that the terminal block contacts it.

The two examples of the present invention can be expected to have an effect that the height dimension can be reduced and the size can be reduced by the difference from the two comparative examples, that is, the configuration in which the elliptical magnetic core is mounted.

[Advantage of the Invention] As described above, according to the present invention, by mounting the integrally formed annular magnetic core (core) on the DIP module type terminal block, the winding can be passed through the annular magnetic core (core). Therefore, even if the winding design is changed after the line filter component itself is mounted on the substrate, the desired characteristics can be obtained by adding the winding or deleting the winding.

In addition, the winding work becomes easy, the mounting density can be increased, and the annular magnetic core (core) can be stably installed.

Since the elliptical magnetic core can be arbitrarily installed on the terminal block, the height dimension can be reduced and the space can be saved.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention, FIG. 2 is a perspective view showing a second embodiment of the present invention, and FIG. 3 is a line filter of a comparative example of the present invention. FIG. 4 is a perspective view showing a line filter of another comparative example of the present invention, and FIG. 5 is a perspective view showing an example of a conventional line filter. 1 …… DIP module type terminal block, 2, 3 …… Annular core, 4 ……
U-shaped core, 5a, 5b, 5c, 5d, 5e …… winding, 6 …… coil bobbin.

Claims (1)

[Scope of utility model registration request] 1. A line filter in which three or more windings are directly applied to an annular magnetic core having an oval cross section, and the magnetic core having the windings is mounted on a DIP module type terminal block. A line filter characterized by.