| 摘要 |
A gas discharge lamp ( 2 ) is operated with an alternating current. A positive lamp current (I<SUB>p</SUB>) is generated with a positive current intisity (I<SUB>p</SUB>) for a positive duration (tau<SUB>p</SUB>). A negative lamp current (I<SUB>N</SUB>) is genrated with a negative current intensity (I<SUB>N</SUB>) for a negative duration (tau<SUB>N</SUB>). A duty cycle (D=tau<SUB>p</SUB>/(tau<SUB>p</SUB>+tau<SUB>N</SUB>)) differs from 50%. A current ratio (R=I<SUB>p</SUB>/I<SUB>N</SUB>) differs from 1.
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