| 摘要 |
The invention relates to a power-controlled operating circuit (1, 21) for a lighting means (LP, LD) and a method for operating the same. For the power control, the actual power value (Pactual) must be measured and compared with a specified target power value (Ptarget) in order to obtain a control difference (Pdiff), which is used as a control value (2). However, the measured actual power value (Pactual) is affected by the circuit-specific power loss (Pl), which differs as a result of production tolerances in the individual operating circuits. In order to nevertheless ensure that the light power output by the lighting means (LP, LD) always corresponds to the target power value (Ptarget), the actual power loss (Pl) of the operating circuit is determined and stored in an advance routine phase in which the lighting means does not yet draw any effective power for light emission. In the subsequent operating phase, if the lighting means has drawn effective energy for light emission, at least one of the control parameters (actual power value, target power value, control difference) is corrected in such a way that the power loss (Pl) does not affect the control process. |
