Patent ID: 8786194

Claim:
A constant current driving apparatus for an LED, comprising: a power supply module configured to supply an electric power; an LED module comprising one or more LEDs connected in serial, the LED module that is luminous by the power supplied by the power supply module; a current detection module connected to an output terminal of the LED module, to detect a current flowing to the LED module; an error amplification module configured to compare the current signal detected by the current detection module to a first preset signal and to amplify and output an error signal base on the result of the comparison; and a plurality of sequential driving control modules connected to the one or more LEDs provided in the LED module in serial, to compare the error signal amplified and outputted by the error amplification module with a second preset reference and to control luminosity and off driving of each LED provided in the LED module connected therewith by generating a sequential driving control signal based on the result of the comparison.