Constant illumination apparatus

Details Constant illumination apparatus Constant illumination apparatus

1977-04-28

1979-05-15

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315199, 315205, 315244, 315308, H05B 3702, G05F 166

Patent

active

041550323

ABSTRACT:
An apparatus that provides constant illumination in response to an AC input power source having variable magnitude. The input power passes through a full wave rectifier and is then switched by a solid state switching device having conductive and nonconductive states to a passive L-C filter. The output of the filter energizes one or more lamps to provide the illumination. A phase control circuit is responsive to a sync signal from the full wave rectifier and a feedback signal from the output of the filter and controls the phase angle conduction time of the solid state switching device at a repetition rate related to the frequency of the AC input power to provide constant illumination from the lamp.

REFERENCES:
patent: 3670202 (1972-06-01), Paine et al.

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