Patent ID: 6480088
Filing Date: 2002-11-12
Classification: H01F

Abstract:
A common mode choke coil, comprising:a toroidal magnetic core mounted on a base; two coils wound equally to each other so as to cancel out respective magnetic fluxes relative to a normal mode current, such that one coil is wound around one half of said toroidal magnetic core and another coil is wound around the other half thereof; a partition plate provided inside said toroidal magnetic core so as to isolate said two coils from each other; an insulating protection plate formed substantially like U-letter, said insulating protection plate being detachably attached via its both ends to said base for mounting said toroidal magnetic core; and a belt-like magnetic shield plate attached to said insulating protection plate at its surface opposite to a surface facing said two coils, said magnetic shield plate being provided along a direction of leakage flux of said two coils so as to reduce said leakage flux and being placed along said partition plate so as to cover said toroidal magnetic core.