Contact status detector

Details Contact status detector Contact status detector

1989-04-07

1990-12-11

DeBoer, Todd E.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

340644, 324418, G01R 3102

Patent

active

049774786

ABSTRACT:
By providing two comparators, each of which have a reference voltage level source connected to one input, and separate voltage level producing/enhancing circuits connected to the contacts of a relay, so that each alternate switch configuration produces a different voltage level at the two comparators, a unique relay switch detection circuit is attained. Preferably, three separate voltage level producing/enhancing circuits are employed, with one circuit connected between the relay output and the two comparators, while the other two circuits are connected to the primary or the secondary relay contacts. Futhermore, the voltage level resulting from each particular switch configuration is pre-set relative to the reference voltage level source imputs to assure that the two comparators produce different combined outputs for each alternate switched condition.

REFERENCES:
patent: 4575718 (1986-03-01), Ludowyk
patent: 4689570 (1987-08-01), Ohgaki et al.
patent: 4777479 (1988-10-01), Hinckley

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