Power source for emergency lighting systems

Details Power source for emergency lighting systems Power source for emergency lighting systems

1989-07-03

1991-01-29

Beha, Jr., William H.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

315 86, 323222, 340333, 340782, 34081503, H02J 906

Patent

active

049888897

ABSTRACT:
A buck/boost converter is driven by a high frequency dc-to-dc flyback converter to provide substantially constant output power, independent of the output voltage, to an inductor to provide current to a load having a v-i characteristic that is suitable for use with a current power source, such as a plurality of parallely-connected LEDs. The flyback converter repetitively generates a battery-simulated output voltage that is current-limited and which may be used to charge a battery as well as to provide power to the buck/boost converter. The buck/boost converter includes a switching circuit for repetitively transferring current to the load and a current sensor circuit operating in conjunction with the switching circuit to change the state of the buck/boost converter to repetitively open the switching means and initiate release of the current to the load.

REFERENCES:
patent: 4395639 (1983-07-01), Bring
patent: 4488057 (1984-12-01), Clarke
patent: 4510400 (1985-04-01), Kiteley
patent: 4672228 (1987-06-01), Swoboda
patent: 4682147 (1987-07-01), Bowman

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