US Patent 9948206 Multilevel power conversion device with flying capacitor

A multilevel power conversion device includes: N (N≥1) direct current voltage sources; a first flying capacitor; a second flying capacitor; and a phase module of a M phase (M≥2) being configured to output, from the output terminal, a potential of one of the input terminals, or a potential obtained by adding or subtracting the voltage of the capacitor to or from the potential of the one of the input terminals, by selectively controlling the respective switching elements in an ON/OFF manner.