Uninterruptible polyphase AC power supply

Details Uninterruptible polyphase AC power supply Uninterruptible polyphase AC power supply

1985-10-29

1987-05-12

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

323214, 323215, 363 2, 363 71, H02M 742, H02J 900

Patent

active

046653228

ABSTRACT:
An uninterruptible polyphase AC power supply equalizes an electric power taken out from a polyphase AC power source, even if unbalanced load is connected to output. The uninterruptible AC power supply comprizes a polyphase balanced phase shifter generating one control signal in synchronous with one phase of the AC power source and other control signals each having a prescribed phase difference with respect to said former control signal, a phase comparator comparing phases of said respective control signals with those of output voltage of the uninterruptible AC power supply to output correction signals whch minimize the phase difference between them, a plurality of phase shifters for signal phase to which are respectively supplied said control signals as well as said correction signal in the corresponding phases to generate invertor control signals in the corresponding phases, and a means for supplying the invertor control signals being the outputs of said respective phase shifters for single phase to the invertors in the corresponding phases.

REFERENCES:
patent: 3448366 (1969-06-01), Goff
patent: 3873846 (1975-03-01), Morio et al.
patent: 4238688 (1980-12-01), Boettcher, Jr. et al.
patent: 4238691 (1980-12-01), Ebert
patent: 4531085 (1985-07-01), Mesenhimer
patent: 4556802 (1985-12-01), Harada et al.
Article entitled "Magnetic Balanced Phase Shifter for Polyphase Supply", IEEE Transactions on Magnetics, vol. Mag. 10, No. 3, Sep. 1974, pp. 973-975.
Article entitled "A 15 kVA, Three-Phase Triport-A New Approach To UPS", Charles W. Boettcher, Jr., Bell Telephone Laboratories, Whippany, N.J. 07981, 1978 IEEE, pp. 59-65.

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