High pressure discharge lamp lighting apparatus

Details High pressure discharge lamp lighting apparatus High pressure discharge lamp lighting apparatus

2011-06-14

2011-06-14

Philogene, Haissa (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

C315S291000, C315S224000, C315S194000, C315S247000, C315S2090SC

Reexamination Certificate

active

07960923

ABSTRACT:
A discharge lamp lighting apparatus includes a discharge container, a pair of electrodes and a power supply apparatus. An alternating current of a frequency, which is lower than stationary frequency, is inserted periodically into the alternating current of stationary frequency. When a lighting current value of the discharge lamp is smaller than a predetermined lower limit, the frequency is set as predetermined minimum frequency. When the lighting current value of a discharge lamp is larger than a predetermined maximum value, the frequency is set as predetermined maximum frequency. When a lighting current value of the discharge lamp is between the lower limit and the maximum value, the frequency is set as a selected frequency corresponding to the lighting current value. The selected frequency increases according to an increase of frequency change as a lighting current value increases.

REFERENCES:
patent: 6713972 (2004-03-01), Nakagawa et al.
patent: 7355355 (2008-04-01), Okamoto
patent: 7443110 (2008-10-01), Hotta et al.
patent: 7446482 (2008-11-01), Sugaya
patent: 2002-175890 (2002-06-01), None
patent: 2006-332015 (2006-12-01), None
patent: 2007-213922 (2007-08-01), None
patent: 2007-250236 (2007-09-01), None
patent: 2008-192388 (2008-08-01), None

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