US 12,252,261 B2
Hybrid propulsion unit for an aircraft
Thomas Klonowski, Moissy-Cramayel (FR); and Thomas Bruno Barraco, Moissy-Cramayel (FR)
Assigned to SAFRAN HELICOPTER ENGINES, Bordes (FR)
Appl. No. 17/600,391
Filed by SAFRAN HELICOPTER ENGINES, Bordes (FR)
PCT Filed Mar. 30, 2020, PCT No. PCT/FR2020/000074
§ 371(c)(1), (2) Date Sep. 30, 2021,
PCT Pub. No. WO2020/201639, PCT Pub. Date Oct. 8, 2020.
Claims priority of application No. 1903501 (FR), filed on Apr. 2, 2019.
Prior Publication US 2022/0177144 A1, Jun. 9, 2022
Int. Cl. B64D 27/24 (2024.01); B60L 53/20 (2019.01); B64C 27/08 (2023.01); B64D 27/02 (2006.01); F02B 61/00 (2006.01); H02J 1/10 (2006.01); H02M 7/06 (2006.01)
CPC B64D 27/24 (2013.01) [B60L 53/20 (2019.02); B64C 27/08 (2013.01); F02B 61/00 (2013.01); H02J 1/102 (2013.01); B60L 2200/10 (2013.01); B60L 2210/30 (2013.01); B64D 27/026 (2024.01); B64D 2221/00 (2013.01); H02J 2310/44 (2020.01); H02M 7/06 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A hybrid propulsion unit for an aircraft with multi-rotor rotary wing, comprising:
an internal combustion engine;
an electric generator coupled to the internal combustion engine such that in operation the internal combustion engine drives the electric generator;
a rectifier connected to the electric generator and configured to convert an alternative current delivered by the electric generator into a direct current;
means for converting direct current into alternative current;
an electrical network connecting the rectifier to the conversion means, the electrical network comprising a high voltage direct current bus;
electric motors connected to the conversion means so that in operation the conversion means supply the electric motors with alternative current;
propellers coupled to the electric motors so that in operation the electric motors drive the propellers;
electrical energy storage means connected to the electrical network, said storage means comprising at least one primary storage element and at least one secondary storage element, and wherein said at least one primary storage element is connected in series with the electrical network, and said at least one secondary storage element is connected in parallel with the electrical network.