Patent ID: 8259477

Claim:
An N-phase resonant converter, comprising: N unit converters, each unit converter having an input and an output; wherein each unit converter comprises an inverter, an LLC series resonant tank coupled to the inverter, and a rectifier coupled to the LLC series resonant tank, and wherein the inputs of the unit converters are connected in parallel and the outputs of the unit converters are connected in parallel; wherein the rectifier of each unit converter comprises a first synchronous rectifier and a second synchronous rectifier; wherein the first synchronous rectifier comprises a first diode and a first semiconductor switch in parallel with the first diode, and the second synchronous rectifier comprises a second diode and a second semiconductor switch in parallel with the second diode, and wherein the rectifier of each unit converter comprises a logic circuit coupled to the first and second synchronous rectifiers; wherein the logic circuit is configured to turn on the first semiconductor switch when the first diode is in an on state and the second diode is in an off state, turn on the second semiconductor switch when the first diode is in an off state and the second diode is in an on state, and turn off both the first and second semiconductor switches when both the first and second diodes are in the on state or both the first and second diodes are in the off state, and wherein the logic circuit comprises a first AND gate coupled to the first switch and a second AND gate coupled to the second switch.