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    • Power-cell switching-cycle capacitor voltage control for modular multi-level converters 

      Virginia Tech Intellectual Properties, Inc.; Wang, Jun; Boroyevich, Dushan; Burgos, Rolando P.; Wen, Bo (United States Patent and Trademark Office, 2018-05-08)
      In a modular multi-level power converter, additional switching states are interleaved between main switching states that control output voltage or waveform. The additional switching states provide current from a DC-link ...