Discharge lamp lighting device
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United States of America Patent
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Mar 19, 2019
Grant Date -
Feb 14, 2019
app pub date -
Oct 16, 2018
filing date -
Aug 28, 2014
priority date (Note) -
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Abstract
A discharge lamp lighting device includes a control unit adapted to control a frequency of the AC electric current supplied to a discharge lamp by a feeding unit, in different manners within a first term and a second term which are alternately repeated, the control unit is adapted to control the frequency of the AC electric current such that, within the first term, the frequency of the AC electric current becomes at least one frequency out of plural set frequencies, and is further adapted to control the frequency of the AC electric current, based on a predetermined frequency and an electric current within the previous first term, such that, within the second term, the frequency of the AC electric current becomes a frequency lower than this predetermined frequency.
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