Method and circuit for improving HID lamp starting

Details Method and circuit for improving HID lamp starting Method and circuit for improving HID lamp starting

1993-10-06

1994-08-16

Pascal, Robert J.

Electric lamp and discharge devices: systems

Condenser in the supply circuit

Inductance in the condenser circuit

315240, 315282, H05B 3700

Patent

active

053390059

ABSTRACT:
In one aspect of the present invention a capacitor is placed in series with the ballast and the lamp. The capacitor lowers the impedance during lamp starting and is shorted out when final arc conditions of the lamp are reached. Method and device for improvement of lumen maintenance of high intensity discharge lamps through minimizing the wall blackening during lamp starting is disclosed. Reducing the electrode material sputtering during the thermionic arc phase of the lamp starting process was achieved by decreasing the cathode fall voltage. The cathode fall voltage in these lamps was decreased by increasing the current flowing through during the starting phase. The increase of starting current was achieved by increasing the open circuit voltage or by decreasing ballast impedance.

REFERENCES:
patent: 3531686 (1970-09-01), Wood
patent: 4355265 (1982-10-01), Cohen et al.
patent: 4415837 (1983-11-01), Sodini
patent: 4503364 (1985-03-01), Engel
patent: 4713587 (1987-12-01), Byszawski et al.
patent: 5049789 (1991-09-01), Kumar et al.
patent: 5118994 (1992-06-01), Byszawski et al.

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