Circuit and method for lighting high pressure discharge lamp
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United States of America Patent
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May 5, 2015
Grant Date -
Jan 1, 2015
app pub date -
Feb 24, 2014
filing date -
Jun 27, 2013
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Abstract
It is an object of the present invention to provide a lighting circuit for and a lighting method of a high-pressure discharge lamp whereby remarkable reduction in illuminance maintaining rate can be avoided by reducing variation in inter-electrode distance in the beginning of usage without modulating a lighting frequency. The object can be achieved by a lighting circuit configured to light a high-pressure discharge lamp by supplying an alternating lamp current, which includes at least one pulse current superimposed on the former half of each half period of a base lamp current and at least two pulse currents and superimposed on the latter half of each half period, to the high-pressure discharge lamp.
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