Method and circuit arrangement for operating a discharge lamp

Details Method and circuit arrangement for operating a discharge lamp Method and circuit arrangement for operating a discharge lamp

2004-12-16

2009-11-17

Vu, David Hung (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S059000, C315S225000, C315S307000

Reexamination Certificate

active

07619369

ABSTRACT:
A method and a circuit arrangement for operating a discharge lamp, in particular during the first hours of operation after lamp manufacture, are described. The method and the circuit arrangement are provided in particular for high-pressure gas discharge lamps (HID or high intensity discharge lamps or UHP or ultra high performance lamps). Furthermore, a lighting unit with a discharge lamp and such a circuit arrangement and a projection system with a projection display and such a lighting unit are described. Switching-over between various modes of operation with different operating frequencies serves to avoid that the burning voltage of the lamp drops into a region of a minimum voltage of a lamp driver unit below which the latter can no longer drive the lamp with its rated power or a desired power.

REFERENCES:
patent: 5677602 (1997-10-01), Paul et al.
patent: 6400095 (2002-06-01), Primisser et al.
patent: 6437520 (2002-08-01), Grouev et al.
patent: 2002/0047645 (2002-04-01), Kominami et al.
patent: 2003/0227765 (2003-12-01), Kubo
patent: 2004/0183463 (2004-09-01), Sun et al.
patent: 2006/0049777 (2006-03-01), Kumagai et al.

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