Device for operating illuminant, comprises two parallel-connected light emitting diode chains, where each comprise two series-connected light emitting diodes

摘要

The device comprises two parallel-connected light emitting diode chains (LL1 to LLn), where each comprise two series-connected light emitting diodes (DL1 to DLn). The illuminant (L) is supplied from a current source circuit (S), which provides a certain current for each of the two light emitting diode chains through the outputs (SL1 to SLn). A diagnosis unit (DIAG) and a disconnection unit (A) are provided, which monitor the voltage drop on each of the two light emitting diode chains of the illuminant.