Actuation of a lighting module
View Patent ↗A circuit for actuating a lighting module, comprising at least two semiconductor light-emitting elements (D 1 , D 2 ) which are connected in series in a first operating mode; wherein, in the event of a predetermined threshold value for an operating voltage ( 101 ) being undershot, a second operating mode is detectable ( 102 ); and wherein, in the second operating mode, the at least two semiconductor light-emitting elements (D 1 , D 2 ) are alternately actuable.
1. A circuit for actuating a lighting module, comprising at least two semiconductor light-emitting elements, the circuit being configured so that said at least two semiconductor light-emitting elements are connected in series in a first operating mode and
wherein, in the event of a predetermined threshold value for an operating voltage being undershot, a second operating mode is detected;
wherein, in the second operating mode, the at least two semiconductor light-emitting elements are alternately actuated
at a frequency in a range of between 65 Hz and 100 KHz so that no flicker can be perceived by the human eye.
2. The circuit as claimed in claim 1 , wherein, depending on the level of the operating voltage, the first operating mode or the second operating mode is set.
3. The circuit as claimed in claim 1 , wherein the at least two semiconductor light-emitting elements are actuated alternately in groups.
4. The circuit as claimed in claim 1 , wherein the at least two semiconductor light-emitting elements are alternately actuated by
a bistable multivibrator;
a counter;
a shift register;
a microcontroller or microprocessor.
5. The circuit as claimed in claim 1 for operating a light source, in particular a light source for a vehicle.
6. A light source comprising the circuit as claimed in claim 1 .
7. The light source as claimed in claim 6 , wherein the light source is a light source for a vehicle.
8. A circuit for actuating a lighting module, comprising at least two semiconductor light-emitting elements; wherein the circuit has a step-down converter and is configured so that said at least two semiconductor light-emitting elements are connected in series in a first operating mode and
in the event of a predetermined threshold value for an operating voltage being undershot, a second operating mode is detected;
wherein, in the second operating mode, the at least two semiconductor light-emitting elements are alternately actuated at a frequency in a range of between 65 Hz and 100 KHz, and wherein with the aid of said step-down converter:
in the first operating mode, a supply voltage is set for the series circuit comprising the at least two semiconductor light-emitting elements; and
in the second operating mode, the supply voltage is set for some of the at least two semiconductor light-emitting elements.
9. A method for actuating a lighting module,
wherein the lighting module comprises at least two semiconductor light-emitting elements,
wherein the at least two semiconductor light-emitting elements are connected in series in a first operating mode; and
wherein, in the event of a predetermined threshold value for an operating voltage being undershot, a second operating mode is detected and, in the second operating mode, the at least two semiconductor light-emitting elements are alternately actuated at a frequency in a range of between 65 Hz and 100 KHz so that no flicker can be perceived by the human eye.