LAMP OPERATING CIRCUIT FOR A GAS DISCHARGE LAMP

摘要

The present invention relates to a switch mode power supply for igniting and operating a high-pressure gas discharge lamp (2), comprising an ignition sub-circuit (20) which is coupled via a transformer (14) to the circuit, wherein the ignition sub-circuit comprises: - at least an ignition capacitor (22); - a switching element (30) for discharging the capacitor at a desired moment in time having a control electrode; wherein the control electrode of the switching element is connected to the commutator (6, 7, 10, 16, 18) of the lamp circuit via a control sub-circuit (32, 34, 36, 38) which comprises substantially passive elements.