Uninterruptible power system

Details Uninterruptible power system Uninterruptible power system

1995-10-10

1997-03-18

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

307 65, 307 66, 363101, H02J 700

Patent

active

056125801

ABSTRACT:
An uninterruptible power supply for providing continuous power from a power source line to a load is provided. In particular, the uninterruptible power supply may either operate in an "Off-Line" mode or one of two "On-Line" modes. The uninterruptible power supply operates in the "Off-Line" mode when the power source line voltage is above a first threshold value. The uninterruptible power supply routes power from the power source line to the load in the "Off-Line" mode. The uninterruptible power supply operates in a first "On-Line" mode when the power source line voltage drops below a first threshold value but exceeds a second threshold voltage, or the frequency of the power source line exceeds a predetermined range. The uninterruptible power supply boosts the power source line voltage in the first "On-Line" mode of operation and applies the boosted signal to the load. The uninterruptible power supply operates in a second "On-Line" mode of operation when the voltage of the power source line voltage drops below a second threshold value or exceeds a third threshold value. The uninterruptible power supply routes reserve power from an energy storage device to the load in the second "On-Line" mode of operation.

REFERENCES:
patent: 5289046 (1994-02-01), Gregorich et al.
patent: 5315533 (1994-05-01), Stich et al.

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