Electrical transmission or interconnection systems – Plural supply circuits or sources – One source floats across or compensates for other source
Patent
1995-06-29
1997-03-11
Shoop, Jr., William M.
Electrical transmission or interconnection systems
Plural supply circuits or sources
One source floats across or compensates for other source
307 43, 307 44, 307 45, 363101, H02J 116
Patent
active
056104502
ABSTRACT:
A booster type DC-DC conversion circuit and a voltage reduction type DC-DC conversion circuit are connected in series with a battery. When battery voltage is high, the booster type DC-DC conversion circuit does not operate, and the voltage reduction type DC-DC conversion circuit outputs a constant voltage lower than the battery voltage. When the battery voltage drops, the booster type DC-DC conversion circuit operates, and converts the battery voltage to a constant voltage higher than the operation voltage of the voltage reduction type DC-DC conversion circuit. The voltage reduction type DC-DC conversion circuit outputs a constant voltage. The power supply apparatus can continuously output a constant voltage from when the battery voltage is high until it becomes low, and can efficiently utilize the battery capacity.
REFERENCES:
patent: 4404624 (1983-09-01), Yamazaki
patent: 4522480 (1985-06-01), Kawabata et al.
patent: 5140229 (1992-08-01), Yagi et al.
Mitsui Hisafumi
Ozawa Hidekiyo
Saeki Mituo
Suzui Tsutomu
Fujitsu Limited
Lockett Kim
Shoop Jr. William M.
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