Patent ID: 8618737
Filing Date: 2013-12-31
Classification: H05B

Abstract:
1. A light-emitting diode (LED) assembly comprising: a plurality of LEDs arranged in groups, each group comprising at least one LED, a control circuit for driving the LEDs, the control circuit comprising a sensing device for sensing an operative parameter of the LEDs, said operative parameter comprising a forward voltage; the control circuit being arranged to: a) operate at least two of the groups of the LEDs simultaneously with each other; b) sense by the sensing device a total value of the operative parameter of the at least two groups; c) repeat a) and b)for at least a different combination of at least two of the groups; d) determine the operative parameter for each of the at least two groups from the sensed total values of the operative parameter; e) assign to each of the groups of LEDs a value of the operative parameter from the determined operative parameter values; f) estimate a temperature of each of the LED groups based on the assigned value of the operative parameter; and g) control the driving of the groups of LEDs from the assigned operative parameter values by using the estimated temperature.