Abstract: Electrical current transducer for mounting around an electrical primary conductor carrying a current to be measured, comprising a primary conductor receiving aperture (16), a housing (4), a magnetic core (6) mounted in the housing, and a secondary coil (10) wound around a branch of the magnetic core. The housing comprises a major portion (4a) and a minor portion (4b), the major portion being separable from the minor portion and configured to be mounted and locked around the primary conductor, the housing major and minor portions joinable together at joining faces (32a, 36a). The magnetic core comprises a major portion (6a) mountable in a core receiving cavity (20) of the housing major portion (4a), and a minor portion (6b) mountable in a core receiving cavity (22) of the housing minor portion (4b).
Abstract: An electrical current transducer comprising a housing, at least one magnetic core comprising an air gap and defining a central passage configured to receive a primary conductor carrying a primary current to be measured through the central passage, a magnetic field detector positioned at least partially in the air gap, and a grounding element. A lateral surface of the magnetic core is positioned against the grounding element without direct fixed attachment between the magnetic core and the grounding element, and the grounding element overlaps the magnetic core to an extent configured to ensure that a capacitive coupling (C3) between the magnetic core and the grounding element is greater than a capacitive coupling (C2) between the magnetic core and the magnetic field detector.
Abstract: A closed-loop current transducer for measuring a current (Ip) flowing in a primary conductor (5), the transducer powered by series connected voltage supplies (V_H, V_L) and comprising a magnetic field detector (WS2), a signal processing circuit including an amplifier circuit (1, 2) connected to the magnetic field detector, and a compensation winding (WS1) connected to the amplifier circuit and configured to generate an opposing magnetic field seeking to cancel a magnetic field generated by the current flowing in the primary conductor. The amplifier circuit comprises a first switched mode power stage configured to drive the magnetic field generator, and a second switched mode power stage (2) configured to balance the currents of the voltage supplies.
Abstract: Toroidal fluxgate current transducer comprising a ring shaped fluxgate sensing unit (6) comprising a ring-shaped support (40), a saturable magnetic core (38) mounted on the support (40), an excitation coil (44) wound around the support and saturable core and a magnetic shell (32) mounted around the excitation coil, ring-shaped support and saturable core. The support is ringed-shape and comprises terminals (50,48) fixed to the support, a first pair of said terminals connected to ends of the excitation coil, and a second pair of said terminals connected to ends of a secondary coil of the current transducer.
Type:
Application
Filed:
August 19, 2011
Publication date:
June 20, 2013
Applicant:
LEM INTELLECTUAL PROPERTY SA
Inventors:
Claude Gudel, Benjamin Marcoz, Bernard Richard, Gérard Gery
Abstract: Integrated circuit Hall sensor system comprising a plurality of elementary blocks (EB), each elementary block including a Hall cell (4), a differential pair (8) of an input stage of a Differential Difference Amplifier (DDA), and terminals (12a, 12b), wherein the terminals (12a, 12b) are placed laterally on opposing outer sides of each elementary block parallel to a Y axis and the plurality of elementary blocks are arranged in a juxtaposed manner to form at least one row (6a, 6b) extending along an X axis orthogonal to the Y axis and interconnected by the terminals.
Abstract: Magnetic field sensor including a magnetic field sensing circuit (2) comprising a reference magnetic field generator (8) and a magnetic field sensing cell (6), and a signal processing circuit (4) connected to the output of the magnetic field sensing cell and comprising a demodulator circuit and a gain correction feedback circuit (30, 28, 47) for correcting error fluctuations in the transfer characteristic of the magnetic field sensor. The sensor further comprises a reference current generator (3) configured to generate a reference current I ref, the reference current generator connected to the magnetic field sensing circuit (2) configured for generating the reference magnetic field B ref and to the gain correction feedback circuit configured for providing a reference signal (yref) to which an output signal of the demodulator circuit may be compared.
Type:
Application
Filed:
June 27, 2011
Publication date:
April 18, 2013
Applicant:
LEM INTELLECTUAL PROPERTY SA
Inventors:
Giovanni Maria Anelli, Marc Pastre, Andrea Ajbl, Maher Kayal