Abstract: A magnetic field sensor system comprising a first magnetic field sensor, one or more second magnetic field sensors and an amplifier and all magnetic field sensors are connected in series so that the respective output signals can be added up to a common input signal of the amplifier.

Abstract: A calibration tool for calibrating a magnetic sensor comprises a cuboid-shaped housing and one or more permanent magnets. The housing is configured to provide six alignment planes. The alignment planes lying opposite to each other extend parallel to each other and the alignment planes lying adjacent to each other include an angle of 90°. The housing has one or more holes allowing to position a magnetic sensor in a working volume located in the center of the housing. The housing may have six sidewalls. One or more of the sidewalls may include one or more adjustable element protruding from the respective sidewall. The adjustable elements may be screws. Permanent magnets of different materials having different temperature coefficients may be used to eliminate the temperature dependence of the magnetic field in the working volume.

Abstract: The invention concerns an angle sensor and a method of measuring an angle of a magnetic field. The angle sensor is configured to measure a direction of a magnetic field in a plane, comprising a first magnetic field sensor having a first sensitivity direction and delivering a first voltage, a second magnetic field sensor having a second sensitivity direction and delivering a second voltage, a first current source supplying a first biasing current to the first magnetic field sensor, a second current source 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.

Abstract: A calibration tool for calibrating a magnetic sensor comprises a cuboid-shaped housing and one or more permanent magnets. The housing is configured to provide six alignment planes. The alignment planes lying opposite to each other extend parallel to each other and the alignment planes lying adjacent to each other include an angle of 90°. The housing has one or more holes allowing to position a magnetic sensor in a working volume located in the center of the housing. The housing may have six sidewalls. One or more of the sidewalls may include one or more adjustable element protruding from the respective sidewall. The adjustable elements may be screws. Permanent magnets of different materials having different temperature coefficients may be used to eliminate the temperature dependence of the magnetic field in the working volume.

Abstract: 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).

Abstract: 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.

Abstract: A magnetic field sensor for measuring a direction of a magnetic field in a plane having two sensing structures (1A; 1B) that can be operated as a rotating Hall element. The two Hall elements are rotated in discrete steps in opposite directions. Such a magnetic field sensor can be used as current sensor for measuring a primary current flowing through a conductor (15).