Common mode choke coil

Abstract

The present invention provides a common mode choke coil which includes a laminated-type coil that has high breakdown voltage reliability. Coil conductors (51, 52) and a coil conductor (55) for a secondary coil are laminated so as to be respectively interposed between, coil conductors for a primary coil, two coil conductors (50, 53) connected to each other by an inner circumferential side via hole conductor (57) and two coil conductors (54, 56) connected by an inner circumferential side via hole conductor (59). Meanwhile, in the primary coil, an outer circumferential side via hole conductor (58) is provided so as to pass through only one insulation layer (40), and accordingly, a length of the outer circumferential side via hole conductor in an axis line direction thereof is reduced. As a result, an amount of conductive material used for the outer circumferential side via hole conductor that diffuses during firing can be reduced, and a drop in a thickness of the insulation layers can be suppressed.

Description

technical field [0001] The present invention relates to a common mode choke coil, and more particularly to a common mode choke coil including a laminated coil. Background technique [0002] A common mode choke coil including a laminated coil includes a laminated body having a laminated structure including a plurality of laminated insulating layers, and a coil is provided inside the laminated body. The coil includes a plurality of helical coil conductors. The plurality of coil conductors respectively have an inner peripheral end located near a relatively central portion of the insulating layer and an outer peripheral end located near a relatively outer periphery, the inner peripheral end is connected to an inner peripheral via-hole conductor, and the outer peripheral end The outer peripheral side via-hole conductor is connected. In addition, in order to create portions of the coil in which the winding directions are opposite to each other, the inner peripheral end portions ...

AI Technical Summary

Problems solved by technology

[0025] As mentioned above, the problem of reduction in withstand voltage reliability due to the diffusion of the conductor material and the reduction in the thickness of the insulating layer for the outer peripheral side via-hole conductor is that the degree of freedom in the design of the coil shape of the common mode choke coil is reduced. s reason

In addition, if the thickness of the insulating layer is increased in order to improve the reliability of the withstand voltage, it will hinder the miniaturization of the common mode choke coil.

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