Two terminal I.C. magnetic-field detector for use in a liquid le

Details Two terminal I.C. magnetic-field detector for use in a liquid le Two terminal I.C. magnetic-field detector for use in a liquid le

1996-01-03

1997-11-11

Hofsass, Jeffrey

Communications: electrical

Condition responsive indicating system

Specific condition

340624, 377 21, H01H 3518, G01F 2336

Patent

active

056868944

ABSTRACT:
A two-terminal integrated circuit magnetic-field detector, for use in detecting a low level of a liquid in a vehicle, has a Hall element, a Schmitt type comparator, an anti-sloshing accumulator such as an up-down counter, and a latching driver all connected in tandem. The anti-sloshing accumulator is for producing a signal that is the integral as a function of time of the binary comparator output signal. During sloshing, when the average liquid level is near that at which a low-level warning signal is desired, the accumulator signal climbs in a vacillating manner. The latching driver is connected across the two integrated circuit (I.C.) terminals and latches on when the accumulator signal reaches a predetermined value, dropping the impedance across the two I.C terminals. A liquid level indicating lamp is connected in series with a source of DC voltage and the two I.C. terminals, so that when the average position of the floating magnet approaches that of the I.C. detector, the driver latches on and the low-level indicating lamp is also turned on and cannot be turned off except by removing the DC energizing voltage. The accumulator may be an up-down counter with means for preventing counting in the over-flow mode, and also for preventing counting in an under-flow mode, namely downward counting below zero count.

REFERENCES:
patent: 3983549 (1976-09-01), Akita et al.
patent: 4361835 (1982-11-01), Nagy
patent: 4967181 (1990-10-01), Iizuka et al.
patent: 5257300 (1993-10-01), Bennett et al.
patent: 5426271 (1995-06-01), Clark et al.

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