Method for operating a high-intensity discharge lamp, lamp...

Details Method for operating a high-intensity discharge lamp, lamp... Method for operating a high-intensity discharge lamp, lamp...

2011-03-22

2011-03-22

Sohn, Seung C (Department: 2878)

Optics: image projectors

Lamp control

C315S096000, C315S097000, C315S291000

Reexamination Certificate

active

07909473

ABSTRACT:
There is described a method for operating a high-intensity discharge lamp (2), in which the high-intensity discharge lamp (2) is acted upon by an AC current (I) which commutates between positive pulses (Ip) and negative pulses (In) with a predefined current amplitude (IA), wherein a pulse width ratio between the pulse width of a positive pulse (Ip) and the pulse width of an adjacent negative pulse (In) is modulated in such a way that the mean current value (I) of two successive positive and negative pulses (Ip, In) fluctuates periodically between positive and negative values. In addition, the value of the current amplitude (IA) is modulated in accordance with a predefined modulation function (M). A description is also given of a corresponding lamp driver (10) for a high-intensity discharge lamp (2) and of a projection system (1) comprising such a lamp driver (10).

REFERENCES:
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patent: 6184633 (2001-02-01), Kramer
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patent: 2003/0102824 (2003-06-01), Kramer
patent: 2004/0095076 (2004-05-01), Kastle et al.
patent: WO02091806 (2002-11-01), None
patent: W002097548 (2002-12-01), None

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