Discharge lamp lighting device
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United States of America Patent
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Sep 18, 2001
Grant Date -
N/A
app pub date -
Jun 25, 1996
filing date -
Jun 29, 1995
priority date (Note) -
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Abstract
A lighting device for a discharge lamp includes a power supplying circuit for supplying electric power to the discharge lamp. A current sensing circuit is operative for sensing a lamp current which flows through the discharge lamp. A control circuit is operative for enabling the power supplying circuit to supply one of a direct-current electric power and a low-frequency electric power to the discharge lamp during a time interval in start of the discharge lamp. The control circuit is also operative for adjusting a duration time of supply of a one-polarity electric power to the discharge lamp in accordance with a magnitude of the lamp current sensed by the current sensing circuit. Further, the control circuit is operative for enabling the power supplying circuit to supply an alternating-current electric power to the discharge lamp after the time interval elapses.
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