Patent ID: 8878462

Claim:
A circuit arrangement for operating at least one discharge lamp, the circuit arrangement comprising: an input with a first input terminal and a second input terminal for coupling to a DC supply voltage; a bridge circuit with at least a first electronic switch and a second electronic switch, the first electronic switch and the second electronic switch being coupled in series between the first input terminal and the second input terminal so as to form a first bridge center point of the bridge circuit, and with at least one coupling capacitor; a first output terminal and a second output terminal for coupling to the high filament of the discharge lamp; a third output terminal and a fourth output terminal for coupling to the low filament of the discharge lamp; a lamp inductor, which is coupled in series between the first bridge center point and one of the output terminals for the high filament of the discharge lamp; a direct current source, which is coupled to the discharge lamp; at least one sensor apparatus for detecting at least one operational parameter of the discharge lamp; and a control apparatus, which is coupled to the at least one sensor apparatus and the direct current source, the control apparatus being designed to vary the amplitude of the direct current output by the direct current source depending on the at least one operational parameter detected by the at least one sensor apparatus, wherein the at least one sensor apparatus comprises a temperature sensor, and wherein the control apparatus is designed to drive the direct current source in such a way that the amplitude of the direct current output by the direct current source is varied in accordance with a predeterminable characteristic stored in the control apparatus depending on the temperature.