Two-phase uninterruptible power supply

Details Two-phase uninterruptible power supply Two-phase uninterruptible power supply

1991-03-15

1991-12-24

Beha, Jr., William H.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

363 72, H02J 906

Patent

active

050755650

ABSTRACT:
Two single phase uninterruptible power supplies are coupled together and controlled such that the two-phase output voltage is matched in frequency and phase with the electrical power provided by the electric utility. The phase difference between the electric utility power lines is measured and stored as a reference signal. When electrical power from the electric utility is lost, the stored reference signal is used to control a master and slave UPS to deliver two-phase power having the same frequency and phase.

REFERENCES:
patent: 2643358 (1953-06-01), Murray
patent: 3207972 (1965-09-01), Love
patent: 3278825 (1966-10-01), Haas
patent: 3295044 (1966-12-01), Pledger et al.
patent: 3377539 (1968-04-01), Bates
patent: 4177414 (1979-12-01), Roesel et al.
patent: 4527080 (1985-07-01), Zweig
patent: 4652770 (1987-03-01), Kumano

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