Electrical transmission or interconnection systems – Plural supply circuits or sources – Substitute or emergency source
Patent
1979-06-04
1981-07-07
Shoop, William ZM.
Electrical transmission or interconnection systems
Plural supply circuits or sources
Substitute or emergency source
363 97, 363133, H02J 900
Patent
active
042776929
ABSTRACT:
A power source provides continuous AC power by employing a bi-directional converter which interfaces a rechargable DC power storage device with AC mains power and AC loads. The bi-directional converter includes a transformer having first and second windings coupled in reverse polarity through dual switching means in parallel with one another. The switching means are coupled to a state controller responsive to conditions at the AC mains terminal, the AC load terminal and the DC power terminal. There are two general operating conditions, an active condition wherein DC power is provided to the AC load, and a standby condition wherein power is recovered by the DC storage device. In the standby condition, the converter operates in a so-called "flyback" mode to recover power and to direct it to the DC storage device. In the active condition, the converter is pulse-width modulated according to a predetermined duty cycle to produce an AC sine wave output at the AC load terminals. Where the AC load includes reactive components, the converter operates to recover unused power from the load and to transfer power back to the DC power source whenever the polarity of the output voltage differs from the polarity of the output current.
REFERENCES:
patent: 3317816 (1967-05-01), Wilting
patent: 3612909 (1971-10-01), Imabayashi
patent: 3634748 (1972-01-01), Rudert
patent: 3986098 (1976-10-01), Tamii et al.
McGannon John L.
Shoop William ZM.
Tab Products Company
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