Interleaved LLC converters and current sharing method thereof

A system comprising:

• a first inductor-inductor-capacitor (LLC) power converter;
• and
• a second LLC power converter interleaved with said first LLC power converter, wherein said first and second LLC power converters are calibrated to output substantially equal output currents, the calibration comprising:
• operating said first and second LLC power converters at a nominal resonant frequency in an open loop;
• measuring an open loop output voltage of said first and second LLC power converters;
• determining which of said first and second LLC power converters outputs a higher measured open loop output voltage;
• and
• increasing a dead-time of whichever of said first and second LLC power converters outputs the higher open loop output voltage.

A method of interleaving a first inductor-inductor-capacitor (LLC) power converter and a second LLC power converter, said method comprising:

• operating the first and second LLC power converters at a nominal resonant frequency in an open loop during a calibration of the first and second LLC power converters;
• measuring an open loop output voltage of the first and second LLC power converters;
• determining which of the first and second LLC power converters outputs a higher measured open loop output voltage;
• increasing a dead-time of whichever of the first and second LLC power converters outputs the higher open loop output voltage;
• coupling the first and second LLC power converters to a common load;
• coupling the first LLC power converter to a first power source and the second LLC power converter to a second power source;
• and
• operating the calibrated first and second LLC power converters in a normal operating mode, wherein an output current of the first LLC power converter is substantially equal to an output current of the second LLC power converter.