Electric lamp and discharge devices: systems – With radiant energy sensitive control means – Radiant energy controlled regulation of the current supply...
Patent
1990-01-29
1991-07-09
Pascal, Robert J.
Electric lamp and discharge devices: systems
With radiant energy sensitive control means
Radiant energy controlled regulation of the current supply...
315307, 315DIG4, 315DIG7, H05B 3700
Patent
active
050308874
ABSTRACT:
An electronic ballast for fluorescent lights is disclosed which includes a pulse width modulation driven inverter with feedback current controlling the pulse width. Ambient light feedback control is provided. The ballast includes a power factor correction pre-regulator for ensuring a high power factor. A pre-heat delay timer allows lamps cathodes to heat before applying driving voltage across the lamps.
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