SENIS AG

Baar, Switzerland
Baar, Switzerland
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The invention concerns an angle sensor and a method of measuring an angle of a magnetic field. The angle sensor is configured configured to measure a direction of a magnetic field in a plane, comprising a first magnetic field sensor (1) having a first sensitivity direction and delivering a first voltage, a second magnetic field sensor (2) having a second sensitivity direction and delivering a second voltage, a first current source (3) supplying a first biasing current to the first magnetic field sensor (1), a second current source (4) supplying a second biasing current to the second magnetic field sensor (2), and electronic circuitry configured to adjust the first biasing current and the second biasing current in such a manner that a sum of the first voltage and the second voltage equals 0, the adjusted values of the first and second biasing currents when the signal U equals 0 representing the angle of the magnetic field.


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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