Patent ID: 7760175

Claim:
A multi-light driving device for driving a plurality of light-emitting units and controlling the brightness of the light-emitting units, comprising: a plurality of oscillation step-up circuits, each of which generates an AC signal for driving each of the light-emitting units and controlling the brightness of each of the light-emitting units; and a digital control circuit, which connects to each of the oscillation step-up circuits, generates sets of digital switching signals, and respectively transmits the sets of the digital switching signals to the oscillation step-up circuits, wherein a phase and a duty cycle of each set of the digital switching signals are controlled by the digital control circuit, and the current level of the AC signal generated by each of the oscillation step-up circuits is adjusted according to the set of the digital switching signals, wherein the digital control circuit comprises: a digital switching signal generating circuit, which electrically connects to each of the oscillation step-up circuits, and generates the sets of the digital switching signals respectively input to the oscillation step-up circuits; and a multiplex feedback-control calculating circuit, which controls the digital switching signal generating circuit, and controls the duty cycles of the sets of the digital switching signals generated by the digital switching signal generating circuit according to feedback signals from the light-emitting units.