Redundant lamp control circuit

Details Redundant lamp control circuit Redundant lamp control circuit

1990-03-16

1991-06-11

Pascal, Robert J.

Electric lamp and discharge devices: systems

Automatic substitution of the load device or electrode

362 20, 362804, F21V 1904

Patent

active

050235150

ABSTRACT:
A circuit for energizing either a first or second lamp and for energizing a motor to position the energized lamp is comprised of first and second switches for supplying current to one of the lamps. Current sensors are provided to monitor the flow of current through each of the lamps. When current is flowing through one lamp and its associated switch, a biasing network assures that the other switch remains open. Upon the failure of the energized lamp, the other lamp is energized, a motor is energized so that the other lamp may be moved to a desired position within the optical system, and a visible indication that the lamp has failed open is provided.

REFERENCES:
patent: 3471745 (1969-10-01), Meyer
patent: 3577173 (1971-05-01), Blomgren
patent: 4410929 (1983-10-01), Feinbloom et al.
patent: 4458179 (1984-07-01), Bainbridge et al.
patent: 4734625 (1988-03-01), Geanous et al.
patent: 4757426 (1988-07-01), Scheller et al.
Pamphlet-Chromophare Models C959 and C570, "A New Era in Surgical Lighting" Martin.

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