Common mode choke coil

Abstract

A common mode choke coil includes a core having a winding core part and a first and second wire wound around the winding core part. The winding core part has a first winding region, a switching region and second winding regions in this order along the axis of the winding core part. In the first winding region, each turn of the first wire is located closer to a first end portion of the winding core part than the corresponding same-numbered turn of the second wire. In the second winding region, each turn of the first wire is located closer to a second end portion of the winding core part than the corresponding same-numbered turn of the second wire. The number of turns of the first and second wires in the first winding region differs from the number of turns of the first and second wires in the second winding region.

Description

technical field [0001] The present invention relates to a common mode choke coil, and more particularly to a wound wire type common mode choke coil having a structure in which two wires are wound around a winding core having both ends. Background technique [0002] refer to Figure 11 and Figure 12 The general structure of the common mode choke coil 31 which becomes the object of this invention is demonstrated. [0003] Such as Figure 11 As shown, the common mode choke coil 31 is provided with the magnetic core 32, and the 1st wire 33 and the 2nd wire 34 which respectively comprise an inductor. The magnetic core 32 is made of an electrically insulating material, more specifically, aluminum as a dielectric, Ni—Zn-based ferrite as a magnetic body, or resin or the like. The magnetic core 32 has a rectangular cross section as a whole. The wires 33 and 34 are made of, for example, copper wires covered with insulation. [0004] The magnetic core 32 has a winding core portion...

AI Technical Summary

Problems solved by technology

[0026] In addition, when the chip-type common mode choke coil 31 is mounted on a mounting board, it is soldered via the terminal electrodes 41 to 44, but the shape of the solder applied to each electrode of the terminal electrodes 41 to 44 is affected by the influence of the terminal electrodes 41 to 44. Influenced by the shape, the shape of the conductive solder ring on the mounting substrate side, etc., it is easy to be inconsistent and can bring asymmetry

[0027] As described above, if asymmetry is brought about in the wound wire structure or in parts other than the wound wire structure, asymmetry or directivity also occurs in electrical characteristics such as inductance and capacitance. As a result, the mode conversion characteristics cannot be reduced as theoretically

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