Circuit control to limit power drain of auxiliary power supply

H - Electricity – 02 – J

Patent

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323/20

H02J 9/00 (2006.01) H02J 3/48 (2006.01) H02J 9/06 (2006.01)

Patent

CA 1128997

EBERT-1 19. CIRCUIT CONTROL TO LIMIT POWER DRAIN OF AUXILIARY POWER SUPPLY Abstract An uninterruptible power supply normally powered by a primary power source (46, FIG. 4) and an emergency power source (47) for supplying power upon disruption of the primary source. To ensure rapid takeover by the emergency source, it is operated in an idling mode. To minimize the power drain from the emergency source, its output current is monitored (53) and utilized (52) for controlling the phase of the output voltage of the emergency source to null its output current, hence its power drain.

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