Patent ID: 8853972

Claim:
A method of driving, by means of a power supply, a number of high-power light-emitting diodes (LEDs), said number of LEDs being divided into two or more groups, each group being separately energizable, said method comprising: a) energizing or de-energizing of a supply current from the power supply into a first one of the groups; b) waiting for a predetermined wait time period; and c) repeating step a) and b) for a second one of the groups, wherein each change of each group from energized to de-energized and from de-energized to energized is provided by a respective switching action, wherein each switching action of each group is separated in time, wherein at least the predetermined wait time period is maintained between each switching action, wherein each switching action leads to a load change of the power supply, wherein the predetermined wait time period is at least equal to the rise time or fall time of the power supply as a result of the load change by the switching action, wherein the predetermined wait time period is substantially smaller than a modulation cycle time, and wherein the waiting for the predetermined wait time period guarantees at substantially each desired LED group intensity a minimum time interval between each load change of the power supply, to ensure that the power supply is stabilized before a following one of the groups is energized or de-energized.