Patent ID: 8836233

Claim:
A light source driving apparatus, suitable for driving at least one light source module, the light source driving apparatus comprising: a voltage converting unit coupled to an input power source and providing a driving current to drive the light source module; a switching unit coupled to the voltage converting unit and controlled to be conducted or not by a switch signal; a feedback unit coupled to the light source module, detecting a load status of the light source module, and providing a feedback signal, wherein the feedback signal has a value representing the detected load status of the light source module; and a control unit coupled to the feedback unit and modulating pulse widths of the switch signal according to the feedback signal, a signal upper limitation, and a signal lower limitation, so as to control the switching unit to be conducted or not, wherein the voltage converting unit comprises an energy storage element, when the switching unit is conducted, the energy storage element stores a part of energy provided by the input power source, and when the switching unit is not conducted, the energy storage element provides the driving current to drive the light source module.