Method and system for starting and operating a discharge lamp

Details Method and system for starting and operating a discharge lamp Method and system for starting and operating a discharge lamp

1996-03-25

1998-04-21

Pascal, Robert

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315220, 315308, 315DIG5, 315DIG7, H05B 3702

Patent

active

057421323

ABSTRACT:
To effectively suppress glow discharge of a discharge lamp, especially a h-pressure discharge lamp, immediately after starting or firing, the lamp is supplied in a second, or run-on phase with a run-up current which has a form factor F greater than one (1), for example 1.13 to 1.45, and which has an effective value I.sub.eff which is higher than the rated normal operating current of the lamp. A control circuit (C), coupled to a controllable power supply, and to a switchable bridge circuit, controls the frequency of the run-on phase current to be higher than the normal operating frequency, for example about 2 kHz with a normal operating frequency between about 90-150 Hz.

REFERENCES:
patent: 4792887 (1988-12-01), Bernitz et al.
patent: 4912374 (1990-03-01), Nagase et al.
patent: 5017839 (1991-05-01), Arlt et al.
patent: 5198728 (1993-03-01), Bernitz et al.
patent: 5365151 (1994-11-01), Spiegel et al.
patent: 5396152 (1995-03-01), Boenigk
patent: 5481162 (1996-01-01), Boenigk et al.
patent: 5483126 (1996-01-01), Boenigk et al.
patent: 5514935 (1996-05-01), Oda et al.

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