THREE LEVEL DC TO DC CONVERTER

Hello, I want to ask some questions regarding three level dc to dc converter .
like what is the advantage of stepping the output ?
How the switching pattern will work ?
and is it is possible to practically implement this ?

Hope the following links help you...

• https://initkms.ru/umk/etf/d/A_zero...e-level_DC-DC_converter_(Canales_F._etc.).pdf
• https://www.eecs.harvard.edu/~wonyoung/wkim_jssc12.pdf
• https://wwwlea.uni-paderborn.de/file...hungen/2001/01epe-froehleke-schniedermann.pdf