Patent ID: 8519632
Filing Date: 2013-08-27
Classification: H02M,H05B,Y02B

Abstract:
1. A drive device for at least one series circuit of multiple light-emitting diodes, comprising: a voltage regulation unit adapted to regulate an operating voltage for the at least one series circuit of the light-emitting diodes; and a current regulation unit for each of the at least one series circuit of light-emitting diodes, the current regulation unit adapted to regulate the current through the particular series circuit of light-emitting diodes, the current regulation unit being connected to the voltage regulation unit to transmit a current regulation signal to the voltage regulation unit; wherein the voltage regulation unit includes a voltage divider, the voltage divider being connected between an operating voltage of the at least one series circuit of light-emitting diodes provided by the voltage regulation unit, and ground, and wherein a tap of the voltage divider and an input of a first regulation stage are connected to an output of a second regulation stage so that when the current regulation signal exceeds a predetermined voltage a voltage at the tap of the voltage divider is reduced.