JPH0438497Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a common mode choke coil used in electronic circuits and electronic equipment for removing common mode noise entering from the outside.

[Prior Art] As shown in Fig. 4, a conventional common mode choke coil has a structure in which two windings are wound around a ring-shaped magnetic core 6 which is divided into two with a gap in the diametrical direction passing through the center. It is becoming.

[Problems to be solved by the invention] However, in the conventional common mode choke coil using a ring-shaped magnetic core, it is difficult to automatically mechanize the means of winding the winding around the magnetic core, and it is difficult to mechanize it manually. It takes a lot of man-hours to do this. Further, it is structurally difficult to stably attach these chiyoke coils on a printed wiring board, and it is also difficult to downsize them from the viewpoint of winding workability.

Therefore, an object of the present invention is to provide a small common mode choke coil that can be easily automated, has a simple structure, and can be stably mounted on a printed wiring board.

[Means for Solving the Problems] According to the present invention, in a common mode York coil constructed by abutting ends of two coils each having a wire wound on two magnetic cores, each of the two magnetic cores is A common mode chiyoke consisting of a square drum-shaped magnetic core with square plate-like flanges at both ends, and is characterized in that the flanges of both magnetic cores are joined to form a closed magnetic path by abutting the corresponding side surfaces of the flanges against each other. A coil is obtained.

[Function] Since the common mode York coil according to the present invention has a wire wound around a square drum-shaped magnetic core, the winding work is easy. Since they are butt-jointed, the structure is simple and the leakage magnetic flux of the coil can be reduced, and since the outer end surface of the flange is flat, it can be stably set on a printed circuit board.

[Embodiment] As shown in FIG. 1, an embodiment of the common mode York coil of the present invention has windings 3 on a drum-shaped magnetic core 1 with flanges 2 extending from both end faces of the center of the magnetic core 1.
wind it. By gluing an insulating material from one side to the outer end surface of one of the flanges 2' of the magnetic core 1 and attaching the electrode 4 thereon, the terminal of the winding 3 is connected to the electrode 4 as a lead wire 5. A welded coil is formed. As shown in FIGS. 2 and 3, when the side surfaces of the two flanges of this coil are butted against each other and bonded together, both magnetic cores 1 form a closed magnetic path and a common mode York coil is formed.

[Effects of the invention] As described above, according to the invention, there is no difficulty in winding the winding around the ring-shaped magnetic core as in the conventional case, and since the drum-shaped magnetic core 1 is used, the winding of the winding 3 can be reduced. It is possible to automate the circular work with machines, and it is easy to assemble and the cost is low. Further, leakage magnetic flux can be reduced by the outer end surface of the flange, and the characteristics of the coil can be improved.

Furthermore, the outer end surface of the flange allows for easy miniaturization, and since the outer end surface of the flange is flat, it can be stably mounted on a printed circuit board. When added, there is an advantage that electrical connection with the conductor on the printed circuit board becomes easy.

[Brief explanation of drawings]

Figure 1 is a perspective view of the external appearance of one coil used in an embodiment of the common mode chiyoke coil of the present invention, and Figure 2 is a perspective view of the external appearance of a common mode chiyoke coil that is a combination of two coils shown in Figure 1. 3 is a longitudinal sectional front view of FIG. 2, and FIG. 4 is a schematic structural diagram of a common mode choke coil using a conventional ring-shaped magnetic core. In addition, 1... magnetic core, 2, 2'... flange, 3,
3'... Winding wire, 4... Electrode, 5... Lead wire, 6
...Ring-shaped magnetic core.

Claims (1)

[Claims for Utility Model Registration] In a common mode York coil constructed by abutting ends of two coils each having a wire wound on two magnetic cores, each of the two magnetic cores has a rectangular plate-shaped flange at each end. What is claimed is: 1. A common mode chiyoke coil comprising a rectangular drum-shaped magnetic core, the cores having corresponding side surfaces of their flanges abutting against each other to form a closed magnetic path.