Four lamp modular lighting control

Details Four lamp modular lighting control Four lamp modular lighting control

1981-10-07

1984-07-31

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Current and/or voltage regulation

315195, 315199, 315247, 315284, 315294, 315324, 315DIG4, H05B 41392

Patent

active

044632878

ABSTRACT:
The invention is directed to a circuit and a method for efficiently controlling the output illumination level of a gas discharge lighting arrangement having four or more gas discharge lamps with multiple ballasts. Load side control of each ballast is provided by a timed interval controlled impedance, serially coupled between the particular ballast and its associated lamps. A circulating inductor, coupled in parallel with each controlled impedance, provides a current path between the power source and the lamps at least during that portion of the AC waveform when the controlled impedances are non-conducting. The invention is equally operable at both 120 volt and 277 volt AC levels without major component changes.

REFERENCES:
patent: 3878431 (1975-04-01), Petrina
patent: 3894265 (1975-07-01), Holmes et al.
patent: 4197485 (1980-04-01), Nuver
patent: 4207497 (1980-06-01), Capewell et al.
patent: 4207498 (1980-06-01), Spira et al.

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