| 摘要 |
The invention relates to a method for operating a high pressure lamp, where an alternating lamp current (2) is supplied to the lamp. To improve the light-arc stability and to decrease dissipation power in the circuit arrangement, the absolute value of said lamp current (2) is substantially constant, and said alternating lamp current (2) is pulse-width modulated, whereby the pulse-width ratio between a pulse-width of a positive pulse and a pulse-width of a negative pulse is modulated. Also a circuit arrangement, a lamp current signal (2), and the use of these is disclosed.
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