Electric lamp and discharge devices: systems – Current and/or voltage regulation
Reexamination Certificate
2008-05-06
2008-05-06
Tran, Thuy V. (Department: 2821)
Electric lamp and discharge devices: systems
Current and/or voltage regulation
C315S2090SC, C315S308000
Reexamination Certificate
active
07368881
ABSTRACT:
In a discharge lamp lighting apparatus, a power supplied to a discharge lamp La through a DC-DC converter1and an inverter2is controlled depending on detection results of a lamp voltage detection unit6and a lamp current detection unit7, and in an electrode heating period an alternation time of an output to the discharge lamp when starting actuation of the discharge lamp is set longer than an alternation time in a steady lighting period, and the alternation time in the electrode heating period is increased depending on lowering of a supply power or current to the discharge lamp. Thus, even when a lamp current is suddenly changed, the discharge lamp is prevented from going off at the time of polarity inversion without lowering a life.
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English language Abstract of JP 9-073991.
English language Abstract of JP 2002-216982.
Kanbara Takashi
Suganuma Kazutoshi
Tanaka Toshifumi
Greenblum & Bernstein P.L.C.
Matsushita Electric & Works Ltd.
Tran Thuy V.
Vu Jimmy T
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