Control gear for illuminants with power measurement and corresponding measuring method

摘要

The invention relates to an operating device for operating one or more light sources, which has a direct voltage converter (1) with a coil (L) and a switch (S) coupled to the coil (L), and means (9, 10; R; R , C) for the direct or indirect detection of the current I_mittel flowing through the switch (S) during the switch-on phase t of the switch (S), means (8, 9) for the direct or indirect detection of the input voltage UMittel (9,) 11) for directly or indirectly detecting the voltage U output by the DC voltage converter (1), and a determining device (2) for determining the power P consumed by the DC voltage converter (2) according to the equation P = U * I * (1 + (Ue / (Ua - Ue))).