Patent ID: 7054169

Claim:
A switched-mode power supply supporting burst-mode operation, in which the power supply provides an output power to a load, the power supply comprising: a first power supply unit for receiving an input power and rectifying the power, and, according to a level of an output for the load, distinguishing between a normal mode and a burst mode to perform switching according to a timing corresponding to one of the normal mode or the burst mode to supply a first power; and an output power supply unit for receiving the first power from the first power supply unit according to a winding ratio of a coil to generate an output power for driving the load; wherein the first power supply unit comprises: a first power converter for receiving the input power, rectifying the input power, then outputting a resulting power; an output power sensing unit for sensing the output power that is output to the load from the output power supply unit and outputting a corresponding signal; a mode determination unit for determining when conditions for operation in a burst mode are satisfied, the mode determination unit performing this operation using a level of the signal output by the output power sensing unit, and the mode determination unit generating and outputting a corresponding control signal; a switching controller for outputting a signal to control timing of the switch, including both extended and shortened time intervals, according to the signal output from the output power sensing unit and a signal output from the mode determination unit; and a switching unit for switching On and Off according to the operation of the switching controller to enable transmission of power converted by the first power converter to the output power supply unit.