Electronic sensor for static magnetic field

Details Electronic sensor for static magnetic field Electronic sensor for static magnetic field

1984-09-20

1986-09-09

Pellinen, A. D.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

307415, 340551, 324236, H01H 3500

Patent

active

046111271

ABSTRACT:
A magnetic field sensor including a resonant circuit having a coil. The resonant frequency varies with the strength of the magnetic field which passes through the coil. The resonant circuit is energized for approximately one-half cycle of the resonant frequency which characterizes the circuit in the absence of a magnetic field. During a sensing window of predetermined duration which then immediately follows, the voltage across the coil is examined for a zero crossing. A zero crossing will occur only in the presence of a magnetic field whose amplitude exceeds a threshold value.

REFERENCES:
patent: 4130792 (1978-12-01), Sullivan
patent: 4446427 (1984-05-01), Lovrenich
patent: 4473799 (1984-09-01), Favre

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