US 12,249,828 B2
Power conversion device
Akira Kikuchi, Tokyo (JP); and Akihiko Kanouda, Tokyo (JP)
Assigned to Hitachi, Ltd., Tokyo (JP)
Appl. No. 18/021,644
Filed by Hitachi, Ltd., Tokyo (JP)
PCT Filed May 7, 2021, PCT No. PCT/JP2021/017476
§ 371(c)(1), (2) Date Feb. 16, 2023,
PCT Pub. No. WO2022/044431, PCT Pub. Date Mar. 3, 2022.
Claims priority of application No. 2020-140731 (JP), filed on Aug. 24, 2020.
Prior Publication US 2024/0039414 A1, Feb. 1, 2024
Int. Cl. H02J 1/10 (2006.01); B60L 53/67 (2019.01); H02M 1/00 (2007.01); H02M 3/335 (2006.01)
CPC H02J 1/106 (2020.01) [B60L 53/67 (2019.02); H02J 1/102 (2013.01); H02M 1/0074 (2021.05); H02M 3/33573 (2021.05); H02M 3/33576 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A power conversion device comprising:
three input lines to which a three-phase voltage is inputted;
3×N converter cells having their respective input terminals connected in series or in parallel between each of the input lines and a neutral line;
M lines of DC bus; and
a plurality of switches that set a state of connection between each of output terminals of the 3×N converter cells and each of the M lines of DC buses, wherein
the output terminals of common converter cells that are the converter cells of a number of stages J (where N>J and J≥1) connected between each of the input lines and the neutral line are connected to a common line as the output terminals of the other common converter cells of two phases are connected to the common line as well,
the output terminals of independent converter cells that are the converter cells of a number of stages K (where K=N−J and K≥1) connected between each of the input lines and the neutral line are connected to an independent line independent of the other independent converter cells of two-phase, and
the plurality of switches includes a common switch that switches a connection relationship between each of the common lines and each of the DC buses, and an independent switch that switches a connection relationship between each of the independent lines and each of the DC buses.