Patent ID: 8817502

Claim:
A switch control device controlling a switching operation of a multi-channel converter including at least two converters and supplying a sum of output powers of the at least two converters to a load, the control device comprising: a gate driver generating at least two gate signals for a switching operation of at least one power switch in each of the at least two converters according to at least two comparison signals; and a multi-phase frequency modulation device modulating a switching frequency of the at least one power switch according to the load, determining a number of phases of the multi-channel converter according to the load, and controlling the gate driver to generate the at least two gate signals that have a phase difference corresponding to the determined number of phases, wherein the multi-phase frequency modulation device generates a count signal and compares the count signal with at least two reference signals corresponding to a number of the at least two converters to generate the at least two comparison signals.