Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
July 19, 2011
Patent Application Number
12116080
Date Filed
May 6, 2008
Patent Primary Examiner
Patent abstract
Ballasts with crest factor control are provided. During a transition to a given half cycle steady state, the current provided to reach the steady state is varied, such as turned off for a short period. This reduction during the transition may reduce or eliminate overshoot. The crest factor control is active, such as altering the timing or number of on/off/on switchings used to control crest factor. The active control may be based on any information, such as time, lamp voltage feedback, or other lamp dependent feedback.
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