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公开(公告)号：US20240175903A1
公开(公告)日：2024-05-30
申请号：US18283153
申请日：2022-03-15
申请人： LEM International SA
发明人： Fabien Millet , Stéphan Trombert
CPC分类号： G01R15/185 , G01R19/25
摘要： Fluxgate current transducer including a control circuit and a fluxgate measuring device comprising a fluxgate magnetic field detector, the fluxgate magnetic field detector comprising a saturable soft magnetic core surrounded by an excitation coil, the control circuit comprising an excitation coil drive circuit connected to the excitation coil and a controller connected to the excitation coil drive circuit configured to generate an alternating excitation current Ifx to alternatingly saturate the soft magnetic core. The controller is in the form of a FPGA (Field Programmable Gate Array) comprising at least one input comprising a 1 bit sigma delta analog-to-digital converter (ADC) connected to the excitation coil to receive a measurement signal output by the excitation coil.
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公开(公告)号：US20230288453A1
公开(公告)日：2023-09-14
申请号：US18017251
申请日：2021-07-12
申请人： LEM International SA
IPC分类号： G01R15/20
CPC分类号： G01R15/207 , G01R15/202 , G01R15/205
摘要： An open-loop electrical current transducer for surface mounting on an external circuit board, including an integrated circuit (IC) chip including a magnetic field sensing portion and connection terminals on a first active side of the IC chip, a lead frame arrangement including a primary conductor and a plurality of secondary conductors comprising IC connection portions, a plurality of bond wires interconnecting the IC connection portions to the connection terminals of the IC chip, and an insulating overmold housing overmolded over the IC chip, the bond wires, and a portion of the lead frame arrangement. The lead frame arrangement is formed from sheet metal having a base sheet of thickness B wherein at least portions of the lead frame arrangement include a thickness equal to the base sheet thickness B. The first active side of the IC chip faces the lead frame arrangement and at least a portion of the lead frame arrangement includes a thinned portion of thickness T between 20% and 80% of the base sheet thickness B, the thinned portion of thickness T including the IC connection portions of the secondary conductors.
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公开(公告)号：US12007415B2
公开(公告)日：2024-06-11
申请号：US17635870
申请日：2020-08-17
申请人： LEM INTERNATIONAL SA
CPC分类号： G01R15/181 , G01R19/0092
摘要： A current transducer including a Rogowski cable extending between a free end and a signal output connection end, a signal output cable connected to the signal output connection end of the Rogowski cable, and a connector comprising an electrically conductive magnetic core having a first cable end lodging cavity receiving the signal output connection end of the Rogowski cable therein, and a second cable end lodging cavity receiving the free end of the Rogowski cable therein, the Rogowski cable comprising an outer shielding layer connected to a conductor of the signal output cable configured for a ground connection. The current transducer further comprises a conductive grounding connection establishing an electrical contact between the magnetic core and the shielding conductor of the Rogowski cable.
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公开(公告)号：US20230132919A1
公开(公告)日：2023-05-04
申请号：US17915614
申请日：2021-03-24
申请人： LEM International SA
发明人： Fabien Millet , Dominik Schläfli
IPC分类号： G01R15/20
摘要： An open-loop electrical current transducer for measuring an electrical current flowing in a primary conductor, comprising a magnetic circuit core with an air-gap, and a magnetic field sensing device positioned at least partially in said air-gap, the magnetic field sensing device comprising a circuit board, a first magnetic field detector in the form of an ASIC mounted on the circuit board, and a second magnetic field detector in the form of a conductive pick-up coil formed on two or more layers in or on the circuit board. The outputs of the first and second magnetic field detectors are connected to a signal processing circuit generating an output signal representative of said electrical current, the output of the ASIC representing a low frequency (LF) channel and the output of the pick-up coil representing a high frequency (HF) channel.
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公开(公告)号：US20220291258A1
公开(公告)日：2022-09-15
申请号：US17635870
申请日：2020-08-17
申请人： LEM INTERNATIONAL SA
摘要： A current transducer including a Rogowski cable extending between a free end and a signal output connection end, a signal output cable connected to the signal output connection end of the Rogowski cable, and a connector comprising an electrically conductive magnetic core having a first cable end lodging cavity receiving the signal output connection end of the Rogowski cable therein, and a second cable end lodging cavity receiving the free end of the Rogowski cable therein, the Rogowski cable comprising an outer shielding layer connected to a conductor of the signal output cable configured for a ground connection. The current transducer further comprises a conductive grounding connection establishing an electrical contact between the magnetic core and the shielding conductor of the Rogowski cable.
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公开(公告)号：US11422162B2
公开(公告)日：2022-08-23
申请号：US17598390
申请日：2020-03-18
申请人： LEM INTERNATIONAL SA
发明人： Félix Buhlmann , Pascal Morel
摘要： Current transducer including a housing comprising a coil support, a magnetic core extending between a first end and a second end, and a coil comprising a plurality of windings formed around the coil support. The coil support comprises a core receiving channel within which the magnetic core is inserted, the coil support comprising a radially inner support portion and a radially outer support portion between which the core receiving channel is disposed. The radially inner support portion is slidably movable with respect to the radially outer support portion.
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公开(公告)号：US20220099708A1
公开(公告)日：2022-03-31
申请号：US17426393
申请日：2020-01-27
申请人： LEM INTERNATIONAL SA
发明人： Arnaud Labbe , Gérard Lepine , David Seron
摘要： An electrical current transducer including a magnetic core and a magnetic field detector module, the magnetic core and magnetic field detector module each forming a single unit separably mountable around a primary conductor and to a circuit board, the magnetic core having a general U shape including an end branch and lateral branches extending the end branch to respective free ends, the magnetic field detector module being positioned between the lateral branches and extending across a whole width of a gap formed between the lateral branches. The magnetic field detector module includes at least one magnetic field sensing cell, a pair of magnetic concentrators arranged in mirror opposition forming a magnetic field gap therebetween in which the at least one sensing cell is positioned, and an insulating body supporting the magnetic concentrators and at least one sensing cell.
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公开(公告)号：US20220099707A1
公开(公告)日：2022-03-31
申请号：US17598390
申请日：2020-03-18
申请人： LEM INTERNATIONAL SA
发明人： Félix Buhlmann , Pascal Morel
摘要： Current transducer including a housing comprising a coil support, a magnetic core extending between a first end and a second end, and a coil comprising a plurality of windings formed around the coil support. The coil support comprises a core receiving channel within which the magnetic core is inserted, the coil support comprising a radially inner support portion and a radially outer support portion between which the core receiving channel is disposed. The radially inner support portion is slidably movable with respect to the radially outer support portion.
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公开(公告)号：USD884628S1
公开(公告)日：2020-05-19
申请号：US29658557
申请日：2018-08-01
申请人： LEM International SA
设计人： Steve Mouchet
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公开(公告)号：US20240085462A1
公开(公告)日：2024-03-14
申请号：US18283160
申请日：2022-03-04
申请人： LEM International SA
发明人： Thomas Guillemin , Fabien Millet
CPC分类号： G01R15/185 , G01R15/207
摘要： A current transducer comprising a housing including a base and a cover, a magnetic circuit mounted within a cavity of the base, the magnetic circuit comprising a magnetic core and a least one coil wound around the magnetic core, and an electric circuit comprising a first circuit board mounted within the housing, the first circuit board comprising a signal processing circuit connected to the magnetic field detector and to the coil. The transducer further comprises a second circuit board comprising one or more power amplifiers mounted thereon, the second circuit board being integrated within an inner side of a metallic support substrate forming an outer layer of said cover, the metallic support substrate fixed to the housing base to cover the cavity therein with the second circuit board forming an inner side of the cover facing the first circuit board, the first and second boards interconnected electrically by electrical interconnections.
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