High pressure discharge lamp i.e. mercury-free xenon-high pressure discharge lamp, operating method for automotive-application, supplies additional electrical power to high pressure discharge lamp based on detection of lamp flickers

摘要

The device supplies additional electrical power to a high pressure discharge lamp i.e. mercury-free xenon-high pressure discharge lamp, based on the detection of lamp flickers. The lamp flickers are detectable by an evaluation of a lamp current and/or a lamp voltage. The additional electrical power is disconnected during reaching of a stable lamp operation. The additional electrical power is supplied immediately before and immediately after a polarity change of a bipolar supply current. An independent claim is also included for a method for operating a high pressure discharge lamp with a bipolar supply current.