LIGHTING SYSTEM WITH EFFECT FACTOR CORRECTION CONTROL DATA DETERMINED FROM A PHASE MODULATED SIGNAL

摘要

The invention relates to a light emitting diode lighting system comprising a power factor correction controller characterized in that the power factor correction controller comprises an input to receive a phase delay signal indicating a phase delay of a phase modulated dimmer signal and a digital signal processor, coupled to the input, to receive the phase delay signal and determine a control operating parameter from the phase delay signal and to generate a switch control signal using the determined operating parameter to vary an input current to a switching power converter with a phase modulated voltage, wherein the digital signal processor is further arranged to determine start and stop times of each half cycle of a cycle of the phase modulated dimmer signal.