| 摘要 |
The invention relates to a feeding and failure detecting interface for a LED optic signaller, particularly for interfacing to railway feeding networks, said optic signaller providing a plurality of LEDs (3) divided into LED (3) clusters (4), LEDs (3) of each cluster being serially connected each other, characterised in that it comprises for each LED (3) cluster (4) a corresponding current generator (5), serially connected with the relevant cluster, each LED (3) cluster (4) and the relevant generator (5) creating a branch, said branches being connected in parallel each other, in that said interface further comprises tension comparator means (6), an oscillator (7) and switching means (8), said switching means (8) being provided in series with respect to at least one branch, and said oscillator (7) generating a first signal suitable to control said switching means (8), and in that said comparator means compare potential of at least one node of the adjacent branch, so as to generate a second signal, suitable to control switch means (T, T'), said signal being proportional to said first signal, in case all LEDs (3) and the interface components are not in a failure mode, and it is a constant signal suitable to close or to open said switch means (T, T'), when at least one LED (3) or at least a component of said interface is in a failure mode.
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