Patent ID: 9095021
Filing Date: 2015-07-28
Classification: H05B,Y02B

Abstract:
1. A circuit arrangement for operating at least a first and a second cascade of LEDs comprising: an input having a first input terminal and a second input terminal for coupling to a rectified AC supply voltage; a linear regulator having an input; and at least one first higher and one second lower LED unit, wherein the first LED unit comprises the first cascade of LEDs and the second LED unit comprises the second cascade of LEDs; wherein the circuit arrangement furthermore comprises: wherein each LED unit furthermore comprises: wherein the third node of the highest LED unit is coupled to the first input terminal, wherein the second node of the lowest LED unit is coupled to the linear regulator in such a way that the linear regulator is coupled in series between the second node of the lowest LED unit and the second input terminal; wherein the third node of a respective LED unit which does not constitute the highest LED unit is coupled to the second node of the next higher LED unit; wherein the fifth nodes of all the LED units are coupled to a DC voltage source; wherein the DC voltage source is realized by virtue of the fact that the AC voltage occurring at the second node of the lowest LED unit during the operation of the circuit arrangement is used for generating a DC voltage.