Proximity switch with three switching positions

Details Proximity switch with three switching positions Proximity switch with three switching positions

1995-09-20

1996-11-26

Donovan, Lincoln

Electricity: magnetically operated switches, magnets, and electr

Permanent magnet-actuated switches

Plural magnets

335205, H01H 900

Patent

active

055789773

ABSTRACT:
A microswitch with an integrated circuit includes a ferromagnetic tripping body being movable between three switching positions. Two Hall sensors are associated with the tripping body. A permanent magnet being disposed fixedly below the two Hall sensors has one pole facing toward the two Hall sensors for generating field lines penetrating the Hall sensors. A dual evaluation circuit ascertains a ratio of magnetic flux in each of the two Hall sensors, derives a switching signal from a change in the ratio upon an approach of the tripping body and has first and second outputs. The dual evaluation circuit changes a switching state with respect to one of the outputs in reaction to a positive or negative difference in magnetic flux between the two Hall sensors. In this way, an occurrence of a vanishingly small difference, a positive difference and a negative difference in magnetic flux is switched through the three positions of the tripping body.

REFERENCES:
patent: 5233323 (1993-08-01), Burkett et al.

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