Symmetrical-hysteresis Hall switch

Details Symmetrical-hysteresis Hall switch Symmetrical-hysteresis Hall switch

1982-01-26

1984-04-17

Miller, Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307303, 324117H, 323294, 323368, H03K 1790, H03K 326, H01L 4306

Patent

active

044437161

ABSTRACT:
A magnet is bonded to a skewed-hysteresis Hall switch in such a position that the magnetic flux, normal to the Hall element, is equal to the average of the magnetic flux required to operate and the magnetic flux required to release the Hall switch. This magnet-Hall-switch assembly is made by initially employing a magnet of much greater strength than needed. The Hall switch is energized and subjected to an oscillating field of zero average value. The on-time to off-time ratio of the magnet-Hall-switch assembly is measured. A demagnetizing field is adjusted to a strength that is directly related to the difference between unity and the Hall switch on-to-off time, and the magnet is then subjected to the adjusted demagnetizing field. These steps are repeated several times. The magnet is thus partially demagnetized to import to the magnet-biased Hall switch a symmetrical hysteresis characteristic. This symmetrical-hysteresis Hall switch is very sensitive and leads to more reliable operation in rotational speed monitoring devices such as speedometers and certain flow meters.

REFERENCES:
patent: 4295118 (1981-10-01), Herr et al.
patent: 4296410 (1981-10-01), Higgs et al.
patent: 4322709 (1982-03-01), Vonder et al.

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