Patents Assigned to LEM INTELLECTUAL PROPERTY SA
  • Publication number: 20160231362
    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).
    Type: Application
    Filed: September 26, 2014
    Publication date: August 11, 2016
    Applicant: LEM INTELLECTUAL PROPERTY SA
    Inventor: Ye Nanshan
  • Publication number: 20140253100
    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.
    Type: Application
    Filed: July 12, 2012
    Publication date: September 11, 2014
    Applicant: LEM INTELLECTUAL PROPERTY SA
    Inventors: Gèrard Lepine, Vinh Tho Vo, Arnaud Labbe
  • Publication number: 20130241534
    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.
    Type: Application
    Filed: September 20, 2011
    Publication date: September 19, 2013
    Applicant: LEM INTELLECTUAL PROPERTY SA
    Inventor: Marc Schaerrer
  • Publication number: 20130154629
    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
  • Publication number: 20130099782
    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.
    Type: Application
    Filed: July 1, 2011
    Publication date: April 25, 2013
    Applicant: LEM INTELLECTUAL PROPERTY SA
    Inventors: Pavel Kejik, Serge Reymond
  • Publication number: 20130093412
    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
  • Patent number: D742842
    Type: Grant
    Filed: September 23, 2014
    Date of Patent: November 10, 2015
    Assignee: LEM INTELLECTUAL PROPERTY SA
    Inventor: Takayuki Hayashi
  • Patent number: D751034
    Type: Grant
    Filed: March 26, 2014
    Date of Patent: March 8, 2016
    Assignee: LEM INTELLECTUAL PROPERTY SA
    Inventor: Nanshan Ye
  • Patent number: D766180
    Type: Grant
    Filed: February 3, 2015
    Date of Patent: September 13, 2016
    Assignee: LEM INTELLECTUAL PROPERTY SA
    Inventor: Pascal Morel