Multilevel power converter

摘要

Aspects of the invention are directed to a multilevel power converter the includes a DC power supply assembly having a positive terminal, a negative terminal, and a zero terminal; a first semiconductor switch series circuit composed of first through sixth semiconductor switches connected in series between the positive terminal and the negative terminal. The converter can include a second semiconductor switch series circuit composed of a first bidirectional switch, seventh and eighth semiconductor switches, and a second bidirectional switch connected in series between the connection point of the first and second semiconductor switches and the connection point of the fifth and sixth semiconductor switches, a first capacitor connected in parallel with a series circuit of the third and fourth semiconductor switches and a second capacitor connected in parallel with the second semiconductor switch series circuit.

主权项

1. A multilevel power converter comprising:
a DC power supply assembly having first and second single DC power supplies connected in series, and three terminals of a positive terminal, a zero terminal, and a negative terminal; a first semiconductor switch series circuit composed of first through sixth semiconductor switches, each having an antiparallel-connected diode, connected in series in this order between the positive terminal and the negative terminal of the DC power supply assembly; a second semiconductor switch series circuit composed of a first bidirectional switch, seventh and eighth semiconductor switches each having an antiparallel-connected diode, and second bidirectional switch connected in series in this order between a connection point of the first semiconductor switch and the second semiconductor switch and the connection point of the fifth semiconductor switch and the sixth semiconductor switch; a first capacitor connected in parallel with a series circuit of the third semiconductor switch and the fourth semiconductor switch; and a second capacitor connected in parallel with the second semiconductor switch series circuit;wherein
the zero terminal of the DC power supply assembly is connected to a connection point of the seventh semiconductor switch and the eighth semiconductor switch; and an AC terminal is at a connection point of the third semiconductor switch and the fourth semiconductor switch.