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公开(公告)号:US20240272208A1
公开(公告)日:2024-08-15
申请号:US18644470
申请日:2024-04-24
Applicant: Allegro MicroSystems, LLC
Inventor: Loïc André Messier , Yannick Vuillermet , Andreas P. Friedrich
IPC: G01R19/165 , G01R15/18 , G01R33/07 , H05K1/18
CPC classification number: G01R19/16504 , G01R15/181 , G01R33/072 , H05K1/181 , H05K2201/10151
Abstract: A current sensor assembly can include: a coil structure having a first coil and a second coil connected in series, the coil structure configured to generate a differential magnetic field responsive to an electrical current passing through the first and second coils; a first magnetic field sensing element disposed proximate to the first coil and operable to generate a first signal responsive to the differential magnetic field passing through the first magnetic field sensing element in a first direction; a second magnetic field sensing element disposed proximate to the second coil and operable to generate a second signal responsive to the differential magnetic field passing through the second magnetic field sensing element in a second direction; and a circuit operable to subtract the first and second signals to generate a differential signal proportional to the electrical current.
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公开(公告)号:US11885866B2
公开(公告)日:2024-01-30
申请号:US17804647
申请日:2022-05-31
Applicant: Allegro MicroSystems, LLC
Inventor: Yannick Vuillermet , Loïc André Messier , Simon E. Rock , Maxwell McNally , Alexander Latham , Andreas P. Friedrich
CPC classification number: G01R35/005 , G01R15/202 , G01R15/207 , G01R33/072
Abstract: Auto-calibrating current sensor integrated circuits (ICs) are configured for mounting at a position relative to a conductor. The auto-calibrating current sensor ICs can include a plurality of magnetic field sensing elements disposed at different locations within the integrated circuit, respectively, and can be configured to measure a magnetic field produced by a current carried by the conductor. The auto-calibrating sensors can include an electromagnetic model of the IC and the conductor. The model can be operative to determine a magnetic field at points in space due to a given current in the conductor at a known location of the conductor from the IC, and also the inverse situation of determining an unknown current and/or location of the conductor based on measurements of a magnetic field at known locations in space due to an unknown current in the conductor. Related auto-calibration methods are also described.
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公开(公告)号:US20230258693A1
公开(公告)日:2023-08-17
申请号:US17651080
申请日:2022-02-15
Applicant: Allegro MicroSystems, LLC
Inventor: Simon E. Rock , Thomas Kerdraon , Yannick Vuillermet , Loïc André Messier , Andreas P. Friedrich
CPC classification number: G01R15/202 , G01R19/0092
Abstract: Current sensor packages are described including a leadframe configured to carry a current to be sensed and a current sensor that is electrically isolated from the leadframe. The current sensor is disposed adjacent to a first portion of the leadframe that includes a plurality of notches. An encapsulating material is configured to encapsulate the current sensor and at least a part of the first portion of the leadframe that is adjacent to the current sensor and includes the plurality of notches. The current sensor includes a substrate, a first magnetic field sensing element that is formed on the substrate, and a second magnetic field sensing element that is formed on the substrate. The first magnetic field sensing element and the second magnetic field sensing element are disposed on opposite sides of a central axis of the first portion of the leadframe.
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公开(公告)号:US20230071087A1
公开(公告)日:2023-03-09
申请号:US17467713
申请日:2021-09-07
Applicant: Allegro MicroSystems, LLC
Inventor: Yannick Vuillermet , Loïc André Messier
Abstract: A current sensor system, includes: a plurality of conductors that are integrated into a substrate, each of the plurality of conductors having a respective first through-hole formed therein and a plurality of current sensors, each of the plurality of current sensors being disposed on the substrate. Each of the plurality of current sensors is disposed above or below the respective first through-hole of a different one of the plurality of conductors, and the substrate includes a plurality of conductive traces, each coupled to at least one of the plurality of current sensors.
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公开(公告)号:US11326903B1
公开(公告)日:2022-05-10
申请号:US17097498
申请日:2020-11-13
Applicant: Allegro MicroSystems, LLC
Inventor: Emanuele Andrea Casu , Yannick Vuillermet
Abstract: An apparatus, comprising: a transmitting coil; a first receiving coil having a first receiving coil portion and a second receiving coil portion, the first receiving coil portion and the second receiving coil portion being coupled to one another, and the first receiving coil portion and the second receiving coil portion each including N lobes, where N is an integer and N≥1; a second receiving coil having a third receiving coil portion and a fourth receiving coil portion, the third receiving coil portion and the fourth receiving coil portion being coupled to one another, and the third receiving coil portion and the fourth receiving coil portion each including N lobes; wherein the first receiving coil is disposed over the second receiving coil.
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公开(公告)号:US11226382B2
公开(公告)日:2022-01-18
申请号:US16841853
申请日:2020-04-07
Applicant: Allegro MicroSystems, LLC
Inventor: David Augendre , Yannick Vuillermet
Abstract: A current sensor system includes a plurality of conductors, each having a first major surface, a second major surface opposite the first major surface, and an aperture extending from the first major surface through a thickness of the conductor to the second major surface. Each of the plurality of conductors is configured to carry a current and wherein the apertures of each of the plurality of conductors are aligned with a common reference line. The current sensor system further includes a plurality of current sensors, each positioned at least partially in the aperture of a respective conductor and including one or more magnetic field sensing elements.
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公开(公告)号:US20210311136A1
公开(公告)日:2021-10-07
申请号:US16841853
申请日:2020-04-07
Applicant: Allegro MicroSystems, LLC
Inventor: David Augendre , Yannick Vuillermet
Abstract: A current sensor system includes a plurality of conductors, each having a first major surface, a second major surface opposite the first major surface, and an aperture extending from the first major surface through a thickness of the conductor to the second major surface. Each of the plurality of conductors is configured to carry a current and wherein the apertures of each of the plurality of conductors are aligned with a common reference line. The current sensor system further includes a plurality of current sensors, each positioned at least partially in the aperture of a respective conductor and including one or more magnetic field sensing elements.
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8.
公开(公告)号:US20210018573A1
公开(公告)日:2021-01-21
申请号:US16511101
申请日:2019-07-15
Applicant: Allegro MicroSystems, LLC
Inventor: Yannick Vuillermet , Loïc André Messier
Abstract: A current sensor is provided with one or more magnetic field sensing elements configured to generate a magnetic field signal indicative of a magnitude of a sensed magnetic field, wherein the sensed magnetic field is related to a magnitude and frequency of a current through a conductor. A signal path is responsive to the magnetic field signal and includes a compensator configured to apply a compensation factor to the magnetic field signal to generate a sensor output signal indicative of the magnitude of the current and substantially independent of a frequency of the current. The sensed magnetic field is related to the magnitude of the current by a coupling factor and the signal path is responsive to a characterization of the coupling factor over a range of frequencies of the current in order to determine the compensation factor to be applied.
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公开(公告)号:US10385964B2
公开(公告)日:2019-08-20
申请号:US15176524
申请日:2016-06-08
Applicant: Allegro MicroSystems, LLC
Inventor: Yannick Vuillermet , Cédric Gillet , Andrea Foletto , Andreas P. Friedrich
IPC: G01P3/44 , G01P21/00 , G01P3/487 , G01P3/488 , G01D18/00 , G01D5/14 , F02D41/22 , F02D41/00 , F16H59/04
Abstract: Embodiments provide systems and methods for determining a position of a gear shift lever of a vehicle. A ferromagnetic target object having selected characteristics influences a magnetic field generated by a back bias magnet. A magnetic field sensor includes magnetic field sensing elements disposed proximate to the target object. Each magnetic field sensing element generates an electronic signal in response to sensed magnetic fields. The gear shift lever moves among a plurality of gears of the vehicle. The magnetic field sensor selects a set of the magnetic field sensing elements to determine a magnetic field difference based on a difference of amplitudes between the electronic signals that is related to a current position of the gear shift lever. Characteristics of the target object enable the magnetic field sensor to detect the position of the gear shift lever. The characteristics include edges proximate to a perimeter of the target object.
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公开(公告)号:US09797963B2
公开(公告)日:2017-10-24
申请号:US14224106
申请日:2014-03-25
Applicant: Allegro Microsystems, LLC
Inventor: Andreas P. Friedrich , Yannick Vuillermet
CPC classification number: G01R33/093 , G01D5/24438 , G01R33/06 , H01F7/02
Abstract: Systems and techniques for a detecting a magnetic target that reduce output signal jitter are disclosed. A system includes a magnetic target. The magnetic target has a plurality of regions having juxtaposed edges and opposing ends. Adjacent ones of the plurality of regions have different magnetic polarities. The magnetic target includes a first magnetic strip, having a first magnetic polarity disposed at one end of the regions, and a second magnetic strip having a second magnetic polarity opposite to the first magnetic polarity disposed at a second end of the regions to generate a magnetic bias across at least a portion of the regions. The system includes at least one magnetic field sensing element placed in proximity to the magnetic target and configured to produce an output signal responsive to the magnetic target.