| 摘要 |
<p>An approach for providing a control signal for a power converter, the power converter being adapted to supply an output current for driving a light source on basis of the control signal, wherein the output current comprises a series of cycles, each cycle consisting of an active period followed by a non-active period is provided. The approach comprises setting the control signal to cause the power converter to supply the active period of a given cycle of the output current employing an active period of a desired duration, receiving an indication of the observed duration of the active period in the given cycle of the output current, determining the difference between the observed duration of the active period of the given cycle of the output current and the desired duration of the active period of the given cycle of the output current on basis of said indication, determining the target duration of the given cycle of the output current on basis of said determined difference to provide a desired duty cycle in the given cycle of the output current, and setting the control signal to cause the power converter to initiate the next cycle of the output current after supplying the given cycle of said target duration</p> |
