Vital relay operating circuit

Details Vital relay operating circuit Vital relay operating circuit

1977-01-14

1978-10-03

Goldberg, Gerald

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

246 34CT, 361187, 340 48, H01H 4722

Patent

active

041187504

ABSTRACT:
There is disclosed a circuit for energizing a vital relay in response to an input signal that is modulated between two frequencies. A discriminator circuit responds to the modulated frequencies and alternately produces an output patented of one polarity and then a reverse polarity in response to the modulated signals. Coupled between the discriminator and the vital relay is a relay driver which responds to the output of the discriminator and energizes the vital relay. A d.c. power supply is coupled to the relay driver. The vital relay includes two windings. Failure of the modulation, the d.c. source or virtually any circuit element, will result in release of the vital relay. The disclosed embodiment uses photoresistors as switching elements.

REFERENCES:
patent: 2838719 (1958-06-01), Chitty
patent: 3202967 (1965-08-01), Wolff
patent: 3715669 (1973-02-01), LaForest
patent: 3828225 (1974-08-01), Grundy

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