Circuit arrangement for starting a high-pressure gas discharge lamp.

摘要

In a circuit arrangement for starting and operating a high-pressure gas discharge lamp (8) by means of a voltage converter comprising at least one semiconductor switch (5, 6), which can be switched periodically to the conductive and to the non-conductive state by a control unit (32, 33, 34) in such a manner that the lamp receives a pulsatory supply current having an operating duty cycle between 0.1 and 0.7, the control unit (32, 33, 34) switches the semiconductor switch (5, 6) upon starting of the lamp (8) in such a manner that the duty cycle upon starting (starting duty cycle) is increased with respect to the operating duty cycle.