Patent ID: 7830102
Filing Date: 2010-11-09
Classification: H05B

Abstract:
1. A light source driving device for driving a plurality of light sources, comprising: a power stage circuit, for converting received signals to alternating current (AC) signals; a transformer and resonance circuit, connected between the power stage circuit and the light sources, for converting the AC signals to electrical signals adapted for driving the light sources; a current balancing circuit, connected to the light sources, for balancing currents flowing through the light sources; a fault detecting circuit comprising a plurality of inputs and an output, for detecting whether one or more of the light sources is faulty; wherein one input of the fault detecting circuit is connected to one input of the current balancing circuit, other inputs of the fault detecting circuit are connected to outputs of the current balancing circuit, and the output of the fault detecting circuit outputs an fault signal, wherein the fault detecting circuit comprising: a feedback control circuit, connected between the fault detecting circuit, the current balancing circuit and the power stage circuit, for controlling output of the power stage circuit according to the currents flowing through the light sources and the fault signal.