Patent ID: 8369112

Claim:
A multiphase resonant DC/DC converter comprising: a plurality of half-bridge-type current resonant DC/DC converters connected in parallel and having a phase difference of 120 degrees, configured to operate at a frequency higher than a resonant frequency, each of the plurality of half-bridge-type current resonant DC/DC converters comprising: a transformer having a primary winding, a secondary winding, and a tertiary winding; a first series circuit connected to both ends of a DC power source and including first and second switching elements; a second series circuit connected to both ends of the first or second switching element and including a resonant reactor, the primary winding of the transformer, and a resonant capacitor; and a rectifying circuit configured to rectify a voltage generated by the secondary winding of the transformer and output the rectified voltage to a smoothing capacitor, wherein the tertiary windings are connected in series with each other, and a reactor is connected in parallel with the series circuit of the tertiary windings so that the tertiary windings and the reactor are annularly connected to each other.