Ground detecting device

Details Ground detecting device Ground detecting device

1979-01-08

1980-09-30

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

361 42, 361203, 361212, 340649, 340652, H02H 314

Patent

active

042258995

ABSTRACT:
A ground detecting device for a vehicle, craft, or the like, having a storage tank mounted on the vehicle, or the like, equipment for selectively controlling the pumping of fluid into and out of the storage tank, comprises a transformer having first, second and third windings, the third winding being electrically connected to ground. A jack is electrically connected in shunt with the third winding. A prong is electrically connected to the vehicle, craft, or the like, and cooperates with the jack, when inserted therein, to short-circuit the third winding to ground. The short-circuit has a short-circuit impedance resulting in a voltage differential at the second winding. A comparator amplifier has a sensing input electrically connected to the second winding, a reference input, and an output. An astable multivibrator has an output electrically connected to the reference input of the comparator amplifier and to the first winding and supplies a reference input signal thereto. A relay has a relay energizing winding electrically connected to the output of the comparator amplifier and controls the equipment for selectively controlling the pumping of fluid into and out of the storage tank. When the vehicle, craft, or the like, is short-circuited, so that static electricity is dissipated from the vehicle, craft, or the like, the short-circuit is reflected at the primary winding of the transformer and produces a voltage drop between the reference input signal and the sensing input of the comparator amplifier. The voltage drop causes saturation of the amplifier resulting in energization of the relay energizing winding and operation of the equipment.

REFERENCES:
patent: 2611862 (1952-09-01), Riddle et al.
patent: 2884594 (1959-04-01), Ludvigsen
patent: 3040211 (1962-06-01), Caldwell
patent: 3250960 (1966-05-01), Walbridge
patent: 4110807 (1978-08-01), Neuhouser

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