Circuit arrangement and method for operating at least one electric lamp

摘要

The present invention relates to a circuit arrangement for operating at least one electric lamp (LP) having a drive circuit ( 16 ), which has at least one terminal for a system voltage (U_N) on the input side and at least one terminal for the at least one electric lamp (LP) on the output side; the drive circuit ( 16 ) having a control unit ( 18 ) and a step-up converter having a step-up converter inductor (L 2 ) and a switch (S 1 ), and the control unit ( 18 ) being designed to operate the step-up converter in a discontinuous mode, in which the current (I_N) through the step-up converter inductor (L 2 ) has gaps, the duration (▮t) of these gaps being varied. It also relates to an operating method for at least one electric lamp (LP) using such a circuit arrangement.