Patent ID: 7659673

Claim:
An apparatus, comprising: at least one energy transfer element to store input energy derived from a power source and to provide output energy to at least one LED; at least one switch coupled to the at least one energy transfer element to control at least the input energy stored to the at least one energy transfer element; and at least one switch controller controlling the at least one switch using a discontinuous mode switching technique to perform multiple switching operations in at least one time period, each switching operation transferring a predetermined quantum of the input energy to the at least one energy transfer element, wherein the at least one switch controller comprises a processor to receive at least one control signal representing a desired power to the at least one LED, the processor controlling, based on a relative range of the desired power to the at least one LED, the multiple switching operations to vary at least one of: the predetermined quantum of the input energy for at least two switching operations in the at least one time period; and a number of the multiple switching operations in the at least one time period, so as to provide a controllably variable power to the at least one LED.