Fluorescent lamp electronic ballast with rapid voltage turn-on a

Details Fluorescent lamp electronic ballast with rapid voltage turn-on a Fluorescent lamp electronic ballast with rapid voltage turn-on a

1996-08-09

1999-07-13

Pascal, Robert

Electric lamp and discharge devices: systems

With cathode or cathode heater supply circuit

Delayed application of the discharge potential

315106, 315107, 315219, H05B 3702

Patent

active

059231262

ABSTRACT:
An electronic ballast for a fluorescent lamp includes a delay triggered circuit which, upon expiration of a predetermined period during which the lamp filaments, constituting opposite electrodes of the lamp, are preheated, applies high frequency operating voltage across the opposite electrodes of the lamp beginning with a transition from a condition of no voltage to a condition of full rated voltage which occurs within one cycle of the high frequency voltage. The sharp transition from zero "glow current" to full "arc current" at the end of the preheating period has been found to increase the life of lamps in the number of on-off starts, particularly with respect to lamps of poor quality. The rapid transition is possible because the ballast uses the same inverter and transformer for supplying preheating and operating voltages. The operating voltage is applied between the opposite electrodes of the lamp via an electronic bi-directional switch, controlled by a preheating delay RC timing circuit.

REFERENCES:
patent: 4256992 (1981-03-01), Luursema
patent: 4682080 (1987-07-01), Ogawa et al.
patent: 4746841 (1988-05-01), Ogawa
patent: 4928039 (1990-05-01), Nilssen
patent: 4937498 (1990-06-01), Bolhuis et al.
patent: 4954749 (1990-09-01), Crawford
patent: 5059868 (1991-10-01), El-Hamamsy et al.
Japanese abstract 3,184,299A Aug. 12, 1991.

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