COMBINATION CHOKE COIL FOR SUPPRESSING HARMONIC CURRENT, AC/DC CONVERSION UNIT AND NOISE FILTER INCORPORATING COMBINATION CHOKE COIL

摘要

PURPOSE: To suppress harmonic current sufficiently while removing each noise component sufficiently regardless of the magnitude of input voltage. ;CONSTITUTION: Windings 21-24 are applied to the legs 16, 17 of a III-shaped core 12. The flux 1, 2 is superposed or offset in the main leg 15 depending on the direction of current flowing through the winding 21-24. Consequently, symmetrical and asymmetrical noise can be removed sufficiently. Inductance of a combination coil 11 is decreased when the windings 21, 22 and 23, 24 are connected in parallel, respectively, and decreased when they are connected in series. This structure provides a desirable inductance corresponding to the magnitude of input voltage.;COPYRIGHT: (C)1996,JPO