Four lamp modular lighting control

Details Four lamp modular lighting control Four lamp modular lighting control

1984-03-28

1985-06-11

Moore, David K.

Electric lamp and discharge devices: systems

Current and/or voltage regulation

315195, 315284, 315308, 315312, 315324, 315DIG4, H05B 41392

Patent

active

045231303

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: 4463287 (1984-07-01), Pitel

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