Importance

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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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First Claim