US 12,304,316 B2
Method for operating an electric drive system for a vehicle
Moritz Haussmann, Nuertingen (DE); Joerg Weigold, Stuttgart (DE); and Maximilian Hepp, Stuttgart (DE)
Assigned to Mercedes-Benz Group AG, Stuttgart (DE)
Appl. No. 18/841,908
Filed by Mercedes-Benz Group AG, Stuttgart (DE)
PCT Filed Feb. 28, 2023, PCT No. PCT/EP2023/054893
§ 371(c)(1), (2) Date Aug. 27, 2024,
PCT Pub. No. WO2023/161497, PCT Pub. Date Aug. 31, 2023.
Claims priority of application No. 10 2022 000 711.8 (DE), filed on Feb. 28, 2022.
Prior Publication US 2025/0108698 A1, Apr. 3, 2025
Int. Cl. H02P 5/56 (2016.01); B60L 15/00 (2006.01); H02M 7/539 (2006.01); H02P 6/30 (2016.01); H02P 23/00 (2016.01)
CPC B60L 15/007 (2013.01) [H02M 7/539 (2013.01); H02P 23/00 (2013.01)] 2 Claims
OG exemplary drawing
 
1. A method for operating an electric drive system (1) of a vehicle, wherein the electric drive system (1) has an electric three-phase motor (2), a battery (3) for electric energy supply of the electric three-phase motor (2), and an inverter (4) via which the electric three-phase motor (2) is couplable electrically to the battery (3), wherein a neutral point (7) of the electric three-phase motor (2) is couplable electrically to a positive pole connection (8) of a direct current charger connection of the electric drive system (1), wherein a negative potential line (6) of the battery (3) is couplable electrically to a negative pole connection (9) of the direct current charger connection of the electric drive system (1), wherein the neutral point (7) is couplable electrically via a first switch (S1) to the positive pole connection (8), wherein the negative potential line (6) is couplable electrically via a second switch (S2) to the negative pole connection (9), and wherein the positive pole connection (8) is couplable electrically via a third switch (S3) to a tap of an intermediate circuit capacitor and thus to a positive potential line (5) of the battery (3), the method comprising the steps of:
opening the first switch (S1), the second switch (S2), and the third switch (S3) when the battery (3) is not to be charged from a first direct current energy source external to the vehicle;
closing the first switch (S1) and the second switch (S2) and opening the third switch (S3) to charge the battery (3) from a second direct current energy source external to the vehicle wherein a provided direct current voltage (UDC) of the second direct current energy source external to the vehicle corresponds to a nominal voltage (UBat) of the battery (3); and
closing the first switch (S1), the second switch (S2), and the third switch (S3) to charge the battery (3) from a third direct current energy source external to the vehicle wherein a provided direct current voltage (UDC) of the third direct current energy source external to the vehicle is smaller than the nominal voltage (UBat) of the battery (3).