Patent ID: 7622909
Filing Date: 2009-11-24
Classification: G01R

Abstract:
1. Electrical current sensor for measuring the electrical current I p flowing in a primary conductor ( 1 ), comprising a magnetic circuit ( 3 ) having an air-gap ( 6 ) and a magnetic field sensor comprising a magnetic field sensing cell ( 10 , 310 ) and a magnetic shield ( 9 , 109 , 209 , 409 ) made of a magnetic material comprising at least two parts ( 12 , 112 , 212 , 412 ) separated by an air-gap ( 20 ) and surrounding the magnetic field sensing cell positioned in a cavity ( 11 ) of the magnetic shield positioned in the air-gap, wherein the magnetic circuit comprises a core ( 5 ) of soft magnetic material surrounding the primary conductor, end faces ( 27 a , 27 b ) of the core having extensions ( 28 a , 28 b ) that reduce the width of the air-gap along an outer periphery of the magnetic core.