Abstract: An LED driver circuit includes at least one string (10) of LEDs (12) connected in series, and a power supply for converting a mains voltage (AC) into an output voltage (Uout) to be applied to the at least one string (10) of LEDs, in which the power supply includes a single-stage boost converter (14) adapted to directly convert the mains voltage (AC) into the output voltage (Uout).

Abstract: An LED driver circuit includes at least one string (10) of LEDs (12) connected in series, and a power supply for converting a mains voltage (AC) into an output voltage (Uout) to be applied to said the at least one string (10) of LEDs, in which the power supply includes a single-stage boost converter (14) adapted to directly convert the mains voltage (AC) into the output voltage (Uout).

Abstract: A power converter includes a DC input (26) connected to an inductive element (TR), a switch (T1) arranged to interrupt the inductive current cyclically with a predetermined cycle period, a plurality of load circuits (31, 32, 33), and a multiplexer (36) having a plurality of parallel channels (M1, M2, M3) between first and second output terminals (34, 38) of the inductive element (TR), wherein each channel includes one of the load circuits (31, 32, 33), and the multiplexer is adapted to make the channels conductive sequentially and periodically, and the multiplexer has a switching period that is a multiple of the predetermined cycle period of the switch (T1).