Discharge lamp lighting device, control method thereof, and...

Electric lamp and discharge devices: systems – Discharge device load

Reexamination Certificate

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Details

C315S291000, C315S2090SC

Reexamination Certificate

active

08044613

ABSTRACT:
A discharge lamp lighting device includes: a power control circuit outputting DC current; an AC conversion circuit generating and outputting discharge lamp driving AC current by inverting the polarity of the DC current at a predetermined timing; a control circuit performing an AC conversion control process of controlling a polarity inversion timing of the discharge lamp driving AC current on the AC conversion circuit and performing an interval current control process of controlling a current value of the DC current every polarity inversion timing interval on the power control circuit; a detection unit detecting a discharge lamp driving voltage at the time of normal lighting; a history information storage periodically storing history information of the detected discharge lamp driving voltage, a statistics processing unit statistically processing the stored history information every predetermined period; and a statistical information storage storing information having been subjected to the statistical process as statistical information. Here, the control circuit sets and controls at least one of a frequency, a duty ratio, and a waveform of the discharge lamp driving AC current on the basis of a time-dependent tendency of the statistical information.

REFERENCES:
patent: 6118521 (2000-09-01), Jung et al.
patent: 6522086 (2003-02-01), Gemunder et al.
patent: 2007/0278963 (2007-12-01), Wu et al.
patent: A-6-34568 (1994-02-01), None
patent: A-11-144887 (1999-05-01), None
patent: A-2002-100491 (2002-04-01), None
patent: A-2002-532866 (2002-10-01), None
patent: WO 00/36882 (2000-06-01), None
patent: WO 04/002200 (2003-12-01), None

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