RIPPLE BASED LIGHT EMITTING DIODE DRIVING

摘要

Drivers (10) for driving first and second light emitting diode circuits (1, 2) that produce first and second light may comprise first generators (11) for in response to ripple information generating first control signals and first controllers (12) for in response to the first control signals controlling first intensities of the first light such that a sum of the first and second intensities the first and second light is less fluctuating than each one of these intensities. The ripple information defines parameters of ripples resulting from rectifications of alternating-current signals. The drivers (10) may further comprise second generators (21) for in response to the ripple information generating second control signals and second controllers (22) for in response to the second control signals controlling the second intensities. Ripple based flickering is reduced and smaller capacitors can be used.

主权项

1. A driver for driving first and second light emitting diode circuits, the first light emitting diode circuit producing first light, the second light emitting diode circuit producing second light, the driver comprising
a converter for feeding an output signal to the first and second light emitting diode circuits, the output signal comprising a ripple, the ripple comprising a ripple information defining a parameter of the ripple; a first generator adapted to retrieve the ripple information, for in response to the ripple information generating a first periodic control signal having a frequency equal to the ripple frequency and a varying magnitude, the first control signal having a first time delay with respect to the ripple; a first controller for in response to the first control signal controlling a first intensity of the first light, a second generator adapted to retrieve the ripple information, for in response to the ripple information generating a second periodic control signal having a frequency equal to the ripple frequency and a varying magnitude, the second control signal having a second time delay with respect to the ripple, and a second controller for in response to the second control signal controlling a second intensity of the second light, wherein the first and second time delays are such that a sum of the first intensity of the first light and the second intensity of the second light is less fluctuating than the first intensity.