LED bypass and control circuit for fault tolerant LED systems
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United States of America Patent
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Sep 4, 2018
Grant Date -
Mar 24, 2016
app pub date -
Dec 2, 2015
filing date -
May 22, 2012
priority date (Note) -
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Abstract
A light system (FIG. 2) is disclosed. The light system includes a plurality of series connected light emitting diodes (240-246). Each of a plurality of switching devices (230-236) has a control terminal and each has a current path coupled in parallel with a respective LED. A plurality of fault detector circuits (220-226) are each coupled in parallel with a respective light emitting diode. Each fault detector circuit has a first comparator (FIG. 7, 704) arranged to compare a voltage across the respective light emitting diode to a respective first reference voltage (708). When a fault is detected, a control signal is applied to the control terminal to turn on a respective switching device of the plurality of switching devices.
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