Fail-safe relay driving

Details Fail-safe relay driving Fail-safe relay driving

1980-11-10

1982-07-06

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

361203, 361204, 361210, H01H 4722

Patent

active

043386504

ABSTRACT:
A relay is activated by an A.C. signal that is supplied through two toroids, connected in series to a signal source. The signal is inductively coupled through each toroid and each toroid is controlled by a corresponding microprocessor. A voltage is applied to each toroid to drive it into a saturated state in which the signal is not transmitted through the toroid. The microprocessor supplies a signal to its respective toroid to drive it out of this saturated state. Both microprocessors simultaneously provide a signal that activates the A.C. signal source. Power to the relay is automatically discontinued if either microprocessor fails to provide the required coupling signals to the A.C. source or its respective toroid.

REFERENCES:
patent: 3225268 (1965-12-01), Metzadour
patent: 3258654 (1966-06-01), Lutsch et al.
patent: 3312876 (1967-04-01), Pohm et al.

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