Fail-safe electronic polarized relay
AssigneeWestinghouse Air Brake Company
InventorJohn O. G. Darrow
Life of this patent
Estimating the term…
Abstract
A fail-safe symmetrical solid-state polarized relay circuit having a positive and a negative level detector coupled to a source of periodic input signals. A pair of amplifiers for amplifying the a.c. oscillations produced by the level detectors. A plurality of rectifiers for rectifying the a.c. oscillations and for alternately producing a d.c. output voltage on a pair of output terminals in accordance with the positive and negative excursions of the periodic input signals.
Claims10
A fail-safe electronic polarized relay circuit comprising, a positive level detector and a negative level detector said positive and said negative level detectors each includes a regulating and an oscillating circuit, said regulating circuit of said first and said second level detectors coupled to a source of periodic input signals, a first amplifier coupled to the output of said oscillating circuit of said positive level detector, a second amplifier coupled to the output of said oscillating circuit of said negative level detector, a first rectifier network coupled to the output of said first amplifier for producing a signal on a first output terminal when the periodic input signal exceeds a predetermined positive value, and a second rectifier network coupled to the output of said second amplifier for producing a signal on a second output terminal when the periodic input signal exceeds a predetermined negative value.
Dependencies are inferred from the claim text.