Electrical transmission or interconnection systems – Plural supply circuits or sources – Substitute or emergency source
Patent
1982-04-29
1984-10-02
Goldberg, E. A.
Electrical transmission or interconnection systems
Plural supply circuits or sources
Substitute or emergency source
307 87, 307129, 364492, 364707, H02J 906, H02J 700
Patent
active
044750471
ABSTRACT:
A power train of an uninterruptible power supply selectively transforms its load from a primary source of power to a reserve source of power under control of a stored program control operating in real time. A microprocessor operating in conjunction with a prioritized interrupt controller and a plurality of external counters monitors and responds to signal conditions existing at various points of the power supply. In particular, the amplitude of a primary AC voltage source is sampled at precise angles of the sinusoidal waveform in response to a comb pulse waveform generated to conform to the actual period of the primary AC voltage. The frequencies range is determined by comparing a count interval to the period of the primary AC voltage. Relative power flow from the primary AC voltage source and a reserve AC voltage signal is controlled by relative phasing of the two signals. The reserve AC voltage signal is adjusted in phase during normal operation when all power is supplied by the primary AC voltage source by comparison to an AC output signal of the power supply to either null power dissipation in the generator of the reserve AC voltage signal or to supply charging current to its energizing DC voltage source.
REFERENCES:
patent: 4010381 (1977-03-01), Fickenscher et al.
patent: 4227154 (1980-10-01), Ebert, Jr.
patent: 4238691 (1980-12-01), Ebert, Jr.
patent: 4241261 (1980-12-01), Ebert, Jr.
patent: 4383184 (1983-05-01), McFarland
patent: 4384213 (1983-05-01), Bogel
patent: 4400624 (1983-08-01), Ebert, Jr.
AT&T Bell Laboratories
Goldberg E. A.
Jennings Derek
Steinmetz Alfred G.
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