Patent ID: 6441605
Filing Date: 2002-08-27
Classification: G01R,H01F

Abstract:
A current sensor, configured to be implemented in an electric device for providing thermal, magnetic and short circuit protection functions, comprising:a primary circuit in which an electrical current to be measured flows, said primary circuit intersecting with a magnetic flux of said current sensor; a secondary circuit acting as a magnetic field detector; and a magnetic circuit comprising two identical opposed elements each having first and second parallel branches, said first branches of each element opposing one another and said second branches of each element opposing one another, and each said element composed of a ferromagnetic material; air gaps with substantially equal thickness each located between corresponding branches of said elements, wherein the secondary circuit includes two coils with several turns, with a cylindrical shape, connected in series, wherein each coil of the secondary circuit is symmetrically positioned with respect to portions thereof on either side of a median plane passing through the air gaps, wherein both coils are made of a same continuous filament with only one wire formed in only one winding operation, and wherein the primary circuit comprises an electrical conductor forming a winding of a cylindrical shape of constant cross-section, encircling one of the two coils of the secondary circuit and positioned symmetrically with respect to portions of said winding on either side of the median plane, wherein the electrical conductor of the primary circuit has a number of passages between the coils greater than 1.