Patent ID: 8456875

Claim:
A power supply device for providing an output voltage, comprising: a first resonant converter for receiving a first input voltage and converting the first input voltage into the output voltage, said first resonant converter having an input end, and an output end for outputting the output voltage; a second resonant converter for receiving a second input voltage and converting the second input voltage into the output voltage, said second resonant converter having an output end for outputting the output voltage, said output ends of said first and second resonant converters being coupled in parallel; a first converting circuit coupled to said input end of said first resonant converter and operable to provide the first input voltage to said first resonant converter; and a current regulating circuit coupled to said first and second resonant converters for receiving signals that are related to output currents of said first and second resonant converters, said current regulating circuit driving operation of said first converting circuit according to the signals received thereby such that the output currents of said first and second resonant converters have substantially equal magnitudes.