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公开(公告)号：EP4374180A2
公开(公告)日：2024-05-29
申请号：EP22743493.3
申请日：2022-07-15
申请人： LEM International SA
CPC分类号： G01R15/185 , G01R19/0092 , G01R19/20
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公开(公告)号：EP4400850A3
公开(公告)日：2024-10-30
申请号：EP24172078.8
申请日：2022-07-15
申请人： LEM International SA
摘要： Fluxgate current transducer (2) including a control circuit (4) and a fluxgate device (2) comprising a saturable soft magnetic core (6) surrounded by an excitation coil (8), the control circuit comprising an excitation coil drive circuit connected to the excitation coil configured to generate an alternating magnetic field to alternatingly saturate the soft magnetic core. The excitation coil comprises a first winding (8a) and a second winding (8b) connected together at a common point (9) forming an input of the first winding and an output of the second winding, the first winding connected in series to a first switch (S1) and the second winding connected in series to a second switch (S2).
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公开(公告)号：EP4400850A2
公开(公告)日：2024-07-17
申请号：EP24172078.8
申请日：2022-07-15
申请人： LEM International SA
IPC分类号： G01R19/20
CPC分类号： G01R15/185 , G01R19/0092 , G01R19/20
摘要： Fluxgate current transducer (2) including a control circuit (4) and a fluxgate device (2) comprising a saturable soft magnetic core (6) surrounded by an excitation coil (8), the control circuit comprising an excitation coil drive circuit connected to the excitation coil configured to generate an alternating magnetic field to alternatingly saturate the soft magnetic core. The excitation coil comprises a first winding (8a) and a second winding (8b) connected together at a common point (9) forming an input of the first winding and an output of the second winding, the first winding connected in series to a first switch (S1) and the second winding connected in series to a second switch (S2).
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公开(公告)号：EP4123317A1
公开(公告)日：2023-01-25
申请号：EP21186819.5
申请日：2021-07-20
申请人： LEM International SA
摘要： Fluxgate current transducer (2) including a control circuit (4) and a fluxgate device (2) comprising a saturable soft magnetic core (6) surrounded by an excitation coil (8), the control circuit comprising an excitation coil drive circuit connected to the excitation coil configured to generate an alternating magnetic field to alternatingly saturate the soft magnetic core. The excitation coil comprises a first winding (8a) and a second winding (8b) connected together at a common point (9) forming an input of the first winding and an output of the second winding, the first winding connected in series to a first switch (S1) and the second winding connected in series to a second switch (S2). The first and second switches are controlled by the control circuit to provide an excitation coil current in the first winding generating a magnetic field in the magnetic core in a first direction, and an excitation coil current in the second winding generating a magnetic field in the magnetic core in a second direction opposite to the first direction.
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公开(公告)号：EP4400849A3
公开(公告)日：2024-10-30
申请号：EP24172077.0
申请日：2022-07-15
申请人： LEM International SA
IPC分类号： G01R19/20
摘要： Fluxgate current transducer (2) including a control circuit (4) and a fluxgate device (2) comprising a saturable soft magnetic core (6) surrounded by an excitation coil (8), the control circuit comprising an excitation coil drive circuit connected to the excitation coil configured to generate an alternating magnetic field to alternatingly saturate the soft magnetic core. The excitation coil comprises a first winding (8a) and a second winding (8b) connected together at a common point (9) forming an input of the first winding and an output of the second winding, the first winding connected in series to a first switch (S1) and the second winding connected in series to a second switch (S2).
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公开(公告)号：EP3848712A1
公开(公告)日：2021-07-14
申请号：EP20151245.6
申请日：2020-01-10
申请人： LEM International SA
摘要： A current measurement system comprising a multi-phase open loop current transducer for measuring phase currents ( I 1 , I 2 , I 3 ) flowing in a plurality n of primary conductors of a multi-phase electrical system. The transducer comprises a housing (2), a magnetic core (3) including first and second core parts (3a, 3b) and a plurality n + 1 of magnetic field detectors (4) mounted in the housing (2) between the first and second core parts in which portions of the primary conductors traversing the current transducer housing are positioned. The system further comprises a non-volatile memory in which information on at least one coupling matrix ( K ), pre-defined in a calibration procedure, is stored, said at least one coupling matrix linking the phase currents ( I 1 , I 2 , I 3 ) flowing in the primary currents to magnetic induction fields ( B 1 , B 2 , B 3 , B 4 ) detected by said magnetic field detectors, and a computation unit configured to compute the values of said n phase currents from the outputs of said n +1 magnetic field detectors using the coupling matrix. The computation unit is further configured to estimate n phase currents in a degraded mode using n +1 degraded mode coupling matrices that allows detection of faults in the magnetic field detectors, leakage currents, or overcurrents.
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公开(公告)号：EP4379398A3
公开(公告)日：2024-10-09
申请号：EP24172076.2
申请日：2022-07-15
申请人： LEM International SA
CPC分类号： G01R15/185 , G01R19/0092 , G01R19/20
摘要： Fluxgate current transducer (2) including a control circuit (4) and a fluxgate device (2) comprising a saturable soft magnetic core (6) surrounded by an excitation coil (8), the control circuit comprising an excitation coil drive circuit connected to the excitation coil configured to generate an alternating magnetic field to alternatingly saturate the soft magnetic core. The excitation coil comprises a first winding (8a) and a second winding (8b) connected together at a common point (9) forming an input of the first winding and an output of the second winding, the first winding connected in series to a first switch (S1) and the second winding connected in series to a second switch (S2).
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公开(公告)号：EP4400849A2
公开(公告)日：2024-07-17
申请号：EP24172077.0
申请日：2022-07-15
申请人： LEM International SA
IPC分类号： G01R19/20
CPC分类号： G01R15/185 , G01R19/0092 , G01R19/20
摘要： Fluxgate current transducer (2) including a control circuit (4) and a fluxgate device (2) comprising a saturable soft magnetic core (6) surrounded by an excitation coil (8), the control circuit comprising an excitation coil drive circuit connected to the excitation coil configured to generate an alternating magnetic field to alternatingly saturate the soft magnetic core. The excitation coil comprises a first winding (8a) and a second winding (8b) connected together at a common point (9) forming an input of the first winding and an output of the second winding, the first winding connected in series to a first switch (S1) and the second winding connected in series to a second switch (S2).
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公开(公告)号：EP4379398A2
公开(公告)日：2024-06-05
申请号：EP24172076.2
申请日：2022-07-15
申请人： LEM International SA
IPC分类号： G01R19/20
CPC分类号： G01R15/185 , G01R19/0092 , G01R19/20
摘要： Fluxgate current transducer (2) including a control circuit (4) and a fluxgate device (2) comprising a saturable soft magnetic core (6) surrounded by an excitation coil (8), the control circuit comprising an excitation coil drive circuit connected to the excitation coil configured to generate an alternating magnetic field to alternatingly saturate the soft magnetic core. The excitation coil comprises a first winding (8a) and a second winding (8b) connected together at a common point (9) forming an input of the first winding and an output of the second winding, the first winding connected in series to a first switch (S1) and the second winding connected in series to a second switch (S2).
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