Patent ID: 7994734
Filing Date: 2011-08-09
Classification: H05B,Y02B

Abstract:
1. A circuit arrangement for operating a discharge lamp, wherein the circuit arrangement comprises a commutation device, which has an input which is coupled to a DC source, and has an output which is coupled to a discharge lamp, wherein the commutation device is designed in such a way that it couples the DC source to the output, and the polarity at which the DC source coupled to the output is commutated by a control device, wherein the control device has a sync input, and the polarity of the DC source is commutated in synchronism with sync pulses of a sync signal which is applied at the sync input, wherein the control device has a measuring input, which is coupled to a measuring device which is designed to provide a measured value which is a measure of the size of electrode peaks, and wherein the control device suppresses at least one commutation if the measured value overshoots or undershoots a predetermined threshold value.