Interleaved LLC converters and current sharing method thereof

摘要

Methods and systems for current sharing using interleaved LLC power converters are described herein. The method provides for current sharing between a first LLC power converter interleaved with a second LLC power converter. The method includes determining an expected output voltage for at least one of the first and second LLC power converters and measuring an output voltage of at least one of the first and second LLC power converters. The method also includes increasing a dead-time of at least one of the first and second LLC power converters when the measured output voltage exceeds the expected output voltage. Finally, the method includes interleaving the first and second LLC power converters, wherein an output current of the first LLC power converter is substantially equal to an output current of the second LLC power converter.

主权项

1. A method of current sharing between a first inductor-inductor-capacitor (LLC) power converter interleaved with 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 to calibrate the first and second LLC power converters; 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.