Patent ID: 8773874

Claim:
A power supply system comprising a direct-current power source, and at least one resonant converter which converts a direct-current voltage input from the direct-current power source into a predetermined output voltage by soft switching based on a current resonance phenomenon, wherein the at least one resonant converter has a joining connection point where a resonance current joins a main current from the direct-current power source, wherein the resonance current is generated by the resonance phenomenon and flows in a direction opposite to the main current, wherein the at least one resonant converter is a plurality of resonant converters which are connected in parallel between the joining connection point and the direct-current power source, and in a predetermined resonant converter of the plurality of resonant converters single driving period is specified when the plurality of the resonant converters to be driven is controlled to increase or decrease in accordance with the predetermined output voltage, a current blocking circuit which blocks the resonance currents of the plurality of resonant converters toward the direct-current power source is provided between the joining connection point and a parallel connection point formed by the parallel connection.