Patent ID: 8446098

Claim:
A light emitting diode (LED) driving circuit, comprising: a first LED module; a second LED module; a first switching converter, having a first input terminal coupled to an input power supply and a first output terminal coupled to the first LED module, and adapted to transform electric power of the input power supply into a first output voltage for lighting the first LED module; a second switching converter, having a second input terminal coupled to the input power supply and a second output terminal coupled to the second LED module, and adapted to transform the electric power of the input power supply into a second output voltage for lighting the second LED module; a current balance circuit, coupled to the first LED module and the second LED module, for balancing currents flowing through the first LED module and the second LED module; an extreme voltage detecting and selecting circuit, coupled to the first LED module and the second LED module, for detecting the first LED module and the second LED module and selecting to output one of detecting results; and a controller, coupled to the extreme voltage detecting and selecting circuit, for controlling transforming of the first switching converter and the second switching converter to respectively light the first LED module and the second LED module in response to the output of the extreme voltage detecting and selecting circuit.