| 摘要 |
A device for operating a plurality of discharge lamps is to be fashioned cost-effectively. Consequently, two discharge lamps ( 71, 72 ) are operated with the aid of one ballast in whose load circuit the heating current for the individual incandescent filaments ( 711, 712, 721, 722 ) is transmitted via a heating transformer with three secondary windings (L<SUB>hs1</SUB>, L<SUB>hs2</SUB>, L<SUB>hs3</SUB>). The associated primary winding (L<SUB>hp</SUB>) is located in a coupling-out circuit ( 30 ) with the aid of which the required heating energy is coupled out via an inductor (L<SUB>res</SUB>). The heating current can be controlled by a temperature-sensitive thermistor (PTC).
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