Common mode choke coil

Abstract

The present invention provides a wound-type common mode choke coil capable of imparting good mode conversion characteristics. The first winding area (A) and the second winding area (B) are distributed along the axial direction of the winding core (35), and the first winding area makes the turns of the first wire (33) and the second wire (34) The turns of the first wire are located on the side of the first end (38) compared with its turns of the same ordinal number, and the second winding area makes the turns of the first wire compared with the turns of the second wire and its same ordinal number, the first The turns of the wire (33) are located on the side of the second end (39). The number of turns of the first wire and the second wire in the first winding area and the number of turns of the first wire and the second wire in the second winding area, one is more than 1.5 times the other, Alternatively, use one with more than 5 fewer turns than the other. By employing an asymmetric winding structure in this way, it is possible to improve the mode conversion characteristics when viewed from a certain direction, compared with a coil having a symmetrical winding structure.

Description

Technical field [0001] The present invention relates to a common mode choke coil, and more particularly, to a wire-wound type common mode choke coil having a structure in which two wires are wound on a winding core portion having two ends. Background technique [0002] Reference Picture 11 and Picture 12 The general configuration of the common mode choke coil 31 targeted by the present invention will be described. [0003] Such as Picture 11 As shown, the common mode choke coil 31 includes a magnetic core 32, and a first wire 33 and a second wire 34 respectively constituting an inductor. The magnetic core 32 is composed of an electrically insulating material, more specifically, aluminum as a dielectric, or Ni-Zn ferrite as a magnetic body, or resin or the like. The magnetic core 32 has a quadrangular cross-sectional shape as a whole. The wire 33 and the wire 34 are formed of, for example, copper wires covered with insulation. [0004] The magnetic core 32 has a winding core part ...

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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