Assembly and method for controlling light emitting diodes dependent on supply voltage amplitude, using shunting switch

摘要

The apparatus (1) has two segments (6) that are divided and string (4) with a terminal (7) is indirectly with a constant current source (8). A first terminal of a first segment is connected to terminal (7). An electronic switch (9) is connected with a first terminal of a constant current source (8). A second input of a control unit (11) is connected to a reference voltage (13). A second input of a control unit (12) is connected with a second reference voltage (14) and the output of the control unit (12) is connected with the control input of an electronic switch (10). An independent claim is included for a method for controlling LEDs.