Discharge lamp igniter with reduced noise output

Details Discharge lamp igniter with reduced noise output Discharge lamp igniter with reduced noise output

1997-06-02

1999-08-31

Wong, Don

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Transformer in the supply circuit

315287, 315219, 315209R, 315274, 361 35, H02H 704

Patent

active

059457864

ABSTRACT:
A gas discharge lamp is provided having a ballast control element and suppressible igniter. The igniter is chosen to superimpose an ignition pulse onto the initial AC ballast cycle or cycles provided to the lamp. The secondary coil of the igniter transformer is initially shorted until sufficient voltage is applied to the igniter. This causes a switch arranged across the secondary coil to open. A voltage detector coupled to a primary winding of the igniter transformer senses the amount of voltage applied from the ballast. Once that amount has been detected, the secondary winding is no longer shorted and the igniter can initially ignite the lamp during a peak of the initial cycle or cycles from the ballast. After the lamp has been initially ionized/discharged, or after a pre-defined set of discharges, the switch remains closed for the duration of each and every ballast cycle. Thus, the igniter is suppressed from the ballast output, and the ballast alone provides lamp discharge.

REFERENCES:
patent: 2491961 (1949-12-01), Eigenberger
patent: 2916671 (1959-12-01), Retzer
patent: 4328446 (1982-05-01), Fallier, Jr. et al.
patent: 4342948 (1982-08-01), Samuels
patent: 4403173 (1983-09-01), Mayer
patent: 4521822 (1985-06-01), Simard
patent: 5424611 (1995-06-01), Moriarty, Jr.

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