Power source transferring

Electrical transmission or interconnection systems – Plural supply circuits or sources – Substitute or emergency source

Patent

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Details

307 64, 307 86, H02J 906

Patent

active

051912295

ABSTRACT:
A circuit (10) for transferring power delivered to a load (16) from a primary voltage source (12) to a secondary power source (14) uses three transistors (32, 40, 46) which switch whenever there is a loss of power from the primary source (12). A capacitor (36), interposed between the first transistor (32) and the second transistor (40) attenuates the signal from the first transistor (32) after a predetermined amount of time to switch the second and third transistors (40,46) to isolate the load (16) from the secondary power source (14).

REFERENCES:
patent: 3626239 (1971-12-01), Brock
patent: 3701904 (1972-10-01), Gardner
patent: 3825798 (1973-06-01), Teich
patent: 4145617 (1979-03-01), Lee et al.
patent: 4342946 (1982-08-01), Valenzona et al.
patent: 4385258 (1983-05-01), Voll
patent: 4492876 (1985-01-01), Colbert et al.
patent: 4528459 (1985-07-01), Wiegel
patent: 4818891 (1989-04-01), Drinkwater
patent: 4864154 (1989-09-01), Copeland et al.

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