US 12,143,031 B2
Multi-level power convertor and method for multi-level power convertor
Fu Yang, Shenzhen (CN); and Yaming Shi, Shenzhen (CN)
Assigned to ABB E-MOBILITY B.V., Delft (NL)
Appl. No. 17/776,122
Filed by ABB E-MOBILITY B.V., Delft (NL)
PCT Filed Nov. 11, 2019, PCT No. PCT/CN2019/117102
§ 371(c)(1), (2) Date May 11, 2022,
PCT Pub. No. WO2021/092720, PCT Pub. Date May 20, 2021.
Prior Publication US 2022/0399830 A1, Dec. 15, 2022
Int. Cl. H02M 1/00 (2007.01); H02M 7/483 (2007.01); H02M 7/49 (2007.01); H02M 7/493 (2007.01); H02M 7/797 (2006.01)
CPC H02M 7/4833 (2021.05) [H02M 1/0043 (2021.05); H02M 7/493 (2013.01); H02M 7/797 (2013.01); H02M 7/49 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A multi-level power convertor comprising:
a DC port;
an AC port;
a first power converting unit coupled to the DC port and comprising a first AC terminal adapted to provide a first plurality of voltage levels;
a second power converting unit coupled to the DC port and comprising a second AC terminal adapted to provide a second plurality of voltage levels of a same number as the first plurality of voltage levels, wherein the second plurality of voltage levels are phase-shifted by 90 degrees with respect to the first plurality of voltage levels;
a coupling inductor comprising first and second windings with a same number of turns, wherein the first winding comprises a first end coupled to the first AC terminal and a second end, the second winding comprises a third end coupled to the second AC terminal and a fourth end, and the second end of the first winding and the third end of the second winding are namesake ends of the first and second windings; and
an inductive filtering unit arranged between the AC port and the second and fourth ends of the first and second windings,
wherein each of the first and second AC terminals provides n voltage levels, and the AC port provides 2n-1 voltage levels.