Long life, fail safe traffic light
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United States of America Patent
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Feb 21, 2017
Grant Date -
Dec 18, 2014
app pub date -
Jun 18, 2013
filing date -
Jun 18, 2013
priority date (Note) -
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Abstract
The present disclosure is directed to a method for detecting a failure in a signal light. In one embodiment, the method includes monitoring operation of one or more light emitting diodes (LEDs) of the signal light coupled to a constant current driver, detecting a short circuit in at least one of the one or more LEDs and signaling a failure in the signal light when the short circuit is detected.
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