Electrical transmission or interconnection systems – Plural supply circuits or sources – Substitute or emergency source
Patent
1982-07-29
1984-02-21
Goldberg, E. A.
Electrical transmission or interconnection systems
Plural supply circuits or sources
Substitute or emergency source
307 20, 307 28, 307 75, H02J 900
Patent
active
044332505
ABSTRACT:
Apparatus is adapted for connection to an alternating current source and a direct current power supply powered by the source. The supply is enabled when the source is operative and disabled when the source is inoperative. The apparatus utilizes first, second and third terminals. A power line monitor is connected at its input to said source and at its output to said first terminal. The monitor maintains the first terminal at a selected potential when the source is enabled, and is unable to maintain the first terminal at any potential when the source is disabled. A first circuit connected to the supply, a battery and the second terminal to charge said battery and to maintain the second terminal at a selected potential when the supply is enabled. The battery maintains the second terminal at the selected potential when the supply is disabled. The first circuit is connected via a resistor to the first terminal to maintain the first terminal at a different potential when the monitor is inoperative. An additional circuit is connected to the first circuit, the supply, the monitor and the third terminal to maintain the third terminal at a selected potential when the monitor is operative and to maintain the terminal at a different potential when the monitor is inoperative.
REFERENCES:
patent: 4342922 (1982-08-01), DiMassimo et al.
Goldberg E. A.
GTE Business Communication Systems Inc.
Jennings Derek
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