Magnetic field sensor and method for operating the magnetic field sensor
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United States of America Patent
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Aug 21, 2007
Grant Date -
Jul 27, 2006
app pub date -
Jul 29, 2003
filing date -
Aug 1, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A magnetic field sensor for the measurement of at least one component of a magnetic field comprises a ferromagnetic core that serves as a magnetic field concentrator, an excitation coil and a read-out sensor. The read-out sensor preferably comprises two sensors arranged in the vicinity of the outer edge of the ferromagnetic core and measures the at least one component of the magnetic field. The ferromagnetic core is ring-shaped or disc-shaped. On operation of the magnetic field sensor, a current is temporarily applied to the excitation coil in order to bring the ferromagnetic core into a state of predetermined magnetization in which the magnetization of the ferromagnetic core produces no signal in the read-out sensor.
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