Common mode choke coil

Abstract

A common mode choke coil comprises a ring-shaped core, and a first coil and a second coil which are wound on the core so as to oppose each other. The core has a square shape or a rectangular shape having a major axis and a minor axis, as viewed in a central axis direction of the core. The first coil and the second coil each comprise a single-layer winding. The area of a lateral section perpendicular to the circumferential direction of the core is constant along the circumferential direction of the core. The shape of the lateral section of the core is quadrilateral.

Description

technical field [0001] The invention relates to a common mode choke coil. Background technique [0002] Conventionally, as a coil component, what is described in Unexamined-Japanese-Patent No. 2006-165212 (patent document 1) is known. like Figure 8 As shown, the coil component 100 has an annular core 101 , and a first coil 110 and a second coil 120 wound around the core 101 so as to face each other. The first coil 110 and the second coil 120 have: inner wire members 111, 121 located in the inner diameter hole of the core 101; outer wire members 112, 122 located radially outside of the core 101; and the inner wire members 111, 122 121 is the wiring 113 , 123 connected to the outer wire member 112 , 122 . [0003] Patent Document 1: Japanese Patent Laid-Open No. 2006-165212 [0004] However, in the above conventional coil component 100, if the inner wire member 111 of the first coil 110 and the inner wire member 121 of the second coil 120 are arranged along the inner perip...

AI Technical Summary

Problems solved by technology

[0006] However, if the core portion 101 is expanded radially outward, the core portion 101 cannot be expanded radially outward due to restrictions on the external dimensions of the coil component 100 .

[0007] On the other hand, if the core portion 101 is to be expanded radially inward, the inner wire member 111 of the first coil 110 and the inner wire member 121 of the second coil 120 are in circumferential contact, and the core portion 101 cannot be expanded radially inward.

In other words, if the inner diameter of the core 101 is made small, the inner wire member 111 of the first coil 110 and the inner wire member 121 of the second coil 120 will contact in the circumferential direction, and the dead zone D cannot be reduced.

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