Uninterruptible power supply apparatus

Details Uninterruptible power supply apparatus Uninterruptible power supply apparatus

2007-01-23

2007-01-23

Tibbits, Pia (Department: 2838)

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

Reexamination Certificate

active

10954073

ABSTRACT:
The uninterruptible power supply apparatus comprises an AC switch for turning on/off the AC power that is input from a commercial AC power source; a storage battery; a power conversion device; a load device connected to the output end of the AC switch; an output AC voltage detection unit for detecting an output AC voltage that is output from the AC switch; and an abnormality detection circuit for detecting that the detected output AC voltage is outside predefined upper and lower limits; wherein said AC switch turns off in accordance with a signal detected by said abnormality detection circuit. Further comprises a restoration circuit for generating a restoration signal when the AC voltage detected by an input AC voltage detection unit exceeds at least a lower-limit AC voltage setting that is increased gradually or continuously in accordance with a load factor computed by a load factor computation circuit.

REFERENCES:
patent: 5315533 (1994-05-01), Stich et al.
patent: 6768223 (2004-07-01), Powell et al.
patent: 05-260684 (1993-10-01), None
patent: 2000139040 (2000-05-01), None

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