Current fault detection for light emitters
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United States of America Patent
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Nov 11, 2008
Grant Date -
Nov 22, 2007
app pub date -
Aug 2, 2007
filing date -
Jul 11, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A device includes a light emitter, a current sensing resistance, a current generator, and detection circuitry. The current generator is connected to the light emitter and to the current sensing resistance. During a normal operating mode of the device, the current generator regulates current flow through the light emitter. In a test mode, the current generator regulates current flow through the current sensing resistance. The detection circuitry, during the test mode, detects when current flow through the current sensing resistance is outside an expected range.
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