Invention Grant
- Patent Title: Off-axis magnetic field angle sensors
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Application No.: US15152863Application Date: 2016-05-12
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Publication No.: US09605978B2Publication Date: 2017-03-28
- Inventor: Udo Ausserlechner , Mario Motz
- Applicant: Infineon Technologies AG
- Applicant Address: DE Neubiberg
- Assignee: Infineon Technologies AG
- Current Assignee: Infineon Technologies AG
- Current Assignee Address: DE Neubiberg
- Agency: Schiff Hardin LLP
- Main IPC: G01B7/30
- IPC: G01B7/30 ; G01R33/09 ; G01R33/07 ; G01D5/14 ; G01D5/16 ; G01D3/08

Abstract:
Embodiments relate to magnetic field angle sensing systems and methods. In an embodiment, a magnetic field angle sensing system configured to determine a rotational position of a magnetic field source around an axis, comprises N sensor devices arranged in a circle concentric to an axis, wherein N>1 and the sensor devices are spaced apart from one another by about (360/N) degrees along the circle, each sensor device comprising a magnetic field sensing device having a sensitivity plane comprising at least one reference direction of the magnetic field sensing device, wherein the magnetic field sensing device is sensitive to a magnetic field component in the sensitivity plane and configured to provide a signal related to a (co)sine of an angle between the reference direction and the magnetic field in the sensitivity plane; and circuitry coupled to the N sensor devices and configured to provide a signal indicative of a rotational position of a magnetic field source around the axis determined by combining the signals from the magnetic field sensing devices of the N sensor devices, wherein the circuitry is configured to (i) interpret the signal of the N sensor devices as angle values, (ii) add integer multiples equivalent to 360° to selective ones of the N angle values to result in at least one monotonously rising or falling sequence of all N corrected values in a single clockwise or counter-clockwise direction of angular positions of respective ones of the N sensor devices, and (iii) average these corrected values.
Public/Granted literature
- US20160258781A1 OFF-AXIS MAGNETIC FIELD ANGLE SENSORS Public/Granted day:2016-09-08
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