Actuation of a lighting module
AssigneeOSRAM GmbH
InventorRalf Vollmer
Life of this patent
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Abstract
A circuit for actuating a lighting module, comprising at least two semiconductor light-emitting elements (D1, D2) 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 (D1, D2) are alternately actuable.
Claims9
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.
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.
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.
Dependencies are inferred from the claim text.