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Popovic R.S.,Ecole Polytechnique Federale de Lausanne | Popovic R.S.,SENIS AG
Proceedings of the International Conference on Microelectronics, ICM | Year: 2014

The resolution of a magnetic sensor depends on its intrinsic noise, offset instability and the magnetic sensitivity. Both noise and offset can be substantially reduced by the spinning current technique. The effective magnetic sensitivity can be increased by the application of a magnetic flux concentrator. The physical limit of magnetic sensitivity is estimated. Values of sensitivity, noise and offset of various discrete and integrated horizontal and vertical Hall devices, and of sensor systems are given. High resolution integrated Hall sensors are currently mostly used as compass in mobile phones. © 2014 IEEE.


Patent
Senis AG | Date: 2014-01-08

The invention concerns a current transducer for measuring a current flowing through a cable, comprising at least one magnetic field sensor and an electronic circuit. The current transducer comprises a head (40) with at least two ferromagnetic cores (46) optimized to reduce the effects of external magnetic fields. The current transducer optionally comprises a magnetic transducer comprising a magnetic field sensor and an electronic circuit. The electronic circuit comprises at least one current source (2), a transformer (3), a fully differential preamplifier (4) coupled to the transformer (3), a phase sensitive detector (6) coupled to the preamplifier (4) and a logic block (5, 5a) configured to operate the magnetic field sensor(s) to provide an AC output voltage. The magnetic field sensor(s) is preferably either a Hall element (1) or an AMR sensor (19) or a flux-gate sensor.


Patent
Senis AG | Date: 2014-08-28

The present invention concerns current transducers for measuring a current flowing through a cable. The current transducers have a ferromagnetic core providing a substantially ring-shaped portion and at least two legs. The ring-shaped portion has one air gap or two air gaps. A magnetic field sensor is placed in or at each of the air gap(s). The ring-shaped portion forms a magnetic circuit that encloses the cable and guides the magnetic field generated by current to the air gap(s). Each leg extends from the center of the associated magnetic field sensor in a direction that runs perpendicularly to the longitudinal axis of the cable and has a certain length. The length of the legs is designed so long that at least two magnetic paths are formed which guide a component of an external magnetic field which extends in the direction of the legs around the magnetic field sensor(s).


The invention concerns a magnetic transducer comprising a magnetic field sensor and an electronic circuit. The electronic circuit comprises at least one current source, a transformer, a fully differential preamplifier coupled to the transformer, a phase sensitive detector coupled to the preamplifier and a logic block configured to operate the magnetic field sensor(s) to provide an AC output voltage. The magnetic field sensor(s) is preferably either a Hall element or an AMR sensor or a fluxgate sensor. The invention further concerns a current transducer for measuring a current flowing through a cable, comprising at least one such magnetic transducer and a head with one or more ferromagnetic cores optimized to reduce the effects of external magnetic fields.


Patent
Senis AG | Date: 2013-06-18

The invention concerns a current transducer for measuring a current flowing through a cable, comprising at least one magnetic field sensor and an electronic circuit. The current transducer comprises a head with a ferromagnetic core optimized to reduce the effects of external magnetic fields. The invention further concerns a magnetic transducer comprising a magnetic field sensor and an electronic circuit. The electronic circuit comprises at least one current source, a transformer, a fully differential preamplifier coupled to the transformer, a phase sensitive detector coupled to the preamplifier and a logic block configured to operate the magnetic field sensor(s) to provide an AC output voltage. The magnetic field sensor(s) is preferably either a Hall element or an AMR sensor or a flux-gate sensor.


Patent
Senis AG | Date: 2016-01-13

A vertical Hall device (1) has a deep N-well (NW), two inner contacts (5, 6), two outer contacts (4, 7) and, optionally, a central contact (12) disposed at a surface of the deep N-well (NW) and arranged along a straight symmetry line (8). The vertical Hall device (1) is designed according to the invention to have either an effective width of the outer contacts (4, 7) that is bigger than an effective width of the inner contacts (5, 6) and/or a shallow highly doped P^(+) stripe disposed between the inner contacts (5, 6) or between each of the inner contacts (5, 6) and the central contact (12). These measures help to balance the resistances of the Wheatstone bridge which describes the electrical characteristics of the vertical Hall device.


The invention concerns a magnetic transducer comprising at least one magnetic field sensor and an electronic circuit. The electronic circuit comprises at least one current source (2), a transformer (3), a fully differential preamplifier (4) coupled to the transformer (3), a phase sensitive detector (6) coupled to the preamplifier (4) and a logic block (5, 5a) configured to operate the magnetic field sensor(s) to provide an AC output voltage. The magnetic field sensor(s) is/are preferably either a Hall element (1) or an AMR sensor (19) or a flux-gate sensor. The invention further concerns a current transducer for measuring a current flowing through a cable, comprising at least one magnetic field sensor and an electronic circuit. The current transducer comprises a head (40) with a ferromagnetic core (46) optimized to reduce the effects of external magnetic fields.


The present invention concerns current transducers for measuring a current flowing through a cable (4). The current transducers have a ferromagnetic core (1) providing a substantially ring-shaped portion (21) and at least two legs (12). The ring-shaped portion (21) has one air gap (2) or two air gaps. A magnetic field sensor (3) is placed in or at each of the air gap(s). The ring-shaped portion (21) forms a magnetic circuit that encloses the cable (4) and guides the magnetic field generated by current to the air gap(s) (2). Each leg (12) extends from the center of the associated magnetic field sensor (3) in a direction that runs perpendicularly to the longitudinal axis of the cable (4) and has a certain length (A). The length (A) of the legs (12) is designed so long that at least two magnetic paths are formed which guide a component of an external magnetic field which extends in the direction of the legs (12) around the magnetic field sensor(s) (3).


The invention concerns a current transducer for measuring a current flowing through a cable, comprising at least one magnetic field sensor and an electronic circuit. The current transducer comprises a head (40) with a ferromagnetic core (46) optimized to reduce the effects of external magnetic fields. The invention further concerns a magnetic transducer comprising a magnetic field sensor and an electronic circuit. The electronic circuit comprises at least one current source (2), a transformer (3), a fully differential preamplifier (4) coupled to the transformer (3), a phase sensitive detector (6) coupled to the preamplifier (4) and a logic block (5, 5a) configured to operate the magnetic field sensor(s) to provide an AC output voltage. The magnetic field sensor(s) is either a Hall element (1) or an AMR sensor (19). The invention further concerns a current leakage detection system having such magnetic transducers.


Patent
Senis AG | Date: 2015-07-08

A vertical Hall device has a deep N-well, two inner contacts, two outer contacts and, optionally, a central contact disposed at a surface of the deep N-well and arranged along a straight symmetry line. The vertical Hall device is designed according to the invention to have an effective width of the outer contacts that is bigger than an effective width of the inner contacts. A shallow highly doped P^(+) stripe may be disposed between the inner contacts or between each of the inner contacts and the central contact. These measures help to balance the resistances of the Wheatstone bridge which describes the electrical characteristics of the vertical Hall device.

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