LED DRIVING DEVICE
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United States of America Patent
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N/A
Issued Date -
Jun 25, 2015
app pub date -
Dec 14, 2012
filing date -
Dec 16, 2011
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Disclosed is an LED driving apparatus capable of removing a non-light-emitting section and extending device life span by adding an optical power compensation circuit to a driving circuit of a multi-stage current driving mode. The design is more efficient with respect to a forward voltage of an LED array driven by the multi-stage current driving circuit and the unique operational characteristics of the optical power compensation circuit. The LED driving apparatus drives a plurality of LED groups and includes a rectification unit for rectifying an AC voltage to generate a ripple voltage at an output, an optical power compensation unit to supply a pre-stored compensation voltage to the LED array when the ripple voltage is less than a minimum forward voltage in the plurality of LED groups, and a constant current driving unit connected the plurality of LED groups to sequentially drive each LED group with a constant current.
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