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Failure Detection for Series of Electrical Loads

  • US 20100264828A1
  • Filed: 04/20/2009
  • Published: 10/21/2010
  • Est. Priority Date: 04/20/2009
  • Status: Active Grant
First Claim
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1. An apparatus for detecting failures in an illumination device comprising at least two light emitting diodes connected in series, the apparatus comprising:

  • a first circuit node, a second circuit node, and a third circuit node for interfacing the illumination device such that a voltage drop across the at least two light emitting diodes is applied between the first and the second circuit node and a fraction of the voltage drop is applied between the second and the third circuit node; and

    an evaluation unit coupled to the first, the second, and the third circuit node and configured to assess whether an electric potential present at the third circuit node is within a pre-defined range of tolerance about a nominal value that is defined as a pre-defined fraction of the voltage drop present between the first and the second circuit node.

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