Multilevel converter with hybrid full-bridge cells. Nami, A. & Wang, L. July 25, 2017. US Patent 9,716,425
bibtex   
@misc{nami2017multilevel,
  title={Multilevel converter with hybrid full-bridge cells},
  author={Nami, Alireza and Wang, Liwei},
  year={2017},
  month=jul # "~25",
  publisher={Google Patents},
  note={US Patent 9,716,425}
}

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