| 摘要 |
The present invention relates to a ballast for at least one electric incandescent lamp, having at least two switching elements (T1, T2) that are coupled to one another with the formation of a first tie point (VP1), a drive circuit (10) with at least one output for driving the at least two switching elements (T1, T2) with the aid of a drive signal that is characterized by a pulse duty factor (d) and an operating frequency (fs), and with an input for a dimming signal (Ud), and a power transformer (Ü) whose primary side (L1) is coupled to the first tie point (VP1), it being possible to connect the at least one electric incandescent lamp (LA1; LA2) to the secondary side (L2) thereof, the drive circuit (10) being designed to vary the pulse duty factor (d) and the operating frequency (fs) of the drive signal as a function of the dimming signal (Ud). Furthermore the invention relates to a corresponding method.
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