公开(公告)号：US12061214B2

公开(公告)日：2024-08-13

申请号：US17630716

申请日：2020-07-20

申请人： LEM INTERNATIONAL SA

发明人： Stephan Trombert

IPC分类号： G01R15/18 ,  G01R33/04

CPC分类号： G01R15/185 ,  G01R33/04

摘要： Fluxgate current transducer including a fluxgate device comprising a saturable soft magnetic core and an excitation coil, and a processing circuit comprising a control circuit and a voltage generator connected to the control circuit for generating an alternating current in the excitation coil, the voltage generator generating a voltage oscillating between a maximum positive voltage (+Umax) and a maximum negative voltage (−Umax) configured to alternatingly saturate the soft magnetic core. The control circuit is configured to generate a voltage having an absolute value of amplitude less than an absolute value of said maximum positive voltage (+Umax) and said maximum negative voltage (−Umax) voltage during a variable time window (Tn, Tn+1, Tn+2, Tn+3) after detection of the excitation coil current reaching a threshold current (S3) representative of saturation of the magnetic core during at least a subset of a plurality of alternating voltage periods (P).

公开(公告)号：US11955958B2

公开(公告)日：2024-04-09

申请号：US16976352

申请日：2019-02-27

申请人： LEM International SA

发明人： Dominik Schläfli ,  Stephan Trombert

IPC分类号： H03K17/082 ,  G01R15/18 ,  G01R15/20 ,  H03K17/90

CPC分类号： H03K17/0828 ,  G01R15/181 ,  G01R15/202 ,  G01R15/207 ,  H03K17/90 ,  H03K2217/0027

摘要： An electronic power switch drive module for a power semiconductor unit, comprising a gate drive and a current transducer mounted on one or more circuit boards, the gate drive comprising at least one circuit portion for controlling at least one transistor of a power semiconductor module of said power semiconductor unit, the current transducer configured to be coupled to an output of the power semiconductor module for measuring an output current of the power semiconductor module, said at least one circuit portion connected to an output potential of the output current to be measured. The current transducer comprises at least one magnetic field sensor, the current transducer being connected to said at least one circuit portion of the gate drive at said output potential in a non-isolated manner.

公开(公告)号：US20220260613A1

公开(公告)日：2022-08-18

申请号：US17630716

申请日：2020-07-20

申请人： LEM INTERNATIONAL SA

发明人： Stephan Trombert

IPC分类号： G01R15/18 ,  G01R33/04

摘要： Fluxgate current transducer including a fluxgate device comprising a saturable soft magnetic core and an excitation coil, and a processing circuit comprising a control circuit and a voltage generator connected to the control circuit for generating an alternating current in the excitation coil, the voltage generator generating a voltage oscillating between a maximum positive voltage (+Umax) and a maximum negative voltage (−Umax) configured to alternatingly saturate the soft magnetic core. The control circuit is configured to generate a voltage having an absolute value of amplitude less than an absolute value of said maximum positive voltage (+Umax) and said maximum negative voltage (−Umax) voltage during a variable time window (Tn, Tn+1, Tn+2, Tn+3) after detection of the excitation coil current reaching a threshold current (S3) representative of saturation of the magnetic core during at least a subset of a plurality of alternating voltage periods (P).