US 12,420,655 B2
Charging system of an electric vehicle using traction inverter and electric machine
Narendar Rao Gannamaneni, Gothenburg (SE); Lars Johan Henrik Sjöstedt, Gothenburg (SE); and Andreas Lars Bertil Ådahl, Kungsbacka (SE)
Assigned to VOLVO CAR CORPORATION, Gothenburg (SE)
Filed by Volvo Car Corporation, Gothenburg (SE)
Filed on Jan. 28, 2022, as Appl. No. 17/587,681.
Claims priority of provisional application 63/155,032, filed on Mar. 1, 2021.
Prior Publication US 2022/0274496 A1, Sep. 1, 2022
Int. Cl. B60L 53/50 (2019.01); B60L 53/22 (2019.01); B60L 53/62 (2019.01); H02J 7/34 (2006.01)
CPC B60L 53/50 (2019.02) [B60L 53/22 (2019.02); B60L 53/62 (2019.02); H02J 7/345 (2013.01); B60L 2210/12 (2013.01); H02J 2207/20 (2020.01)] 20 Claims
OG exemplary drawing
 
1. An electric vehicle charging system, comprising:
a controller, comprising a processor;
a three-phase electric motor; and
an inverter connected to the three-phase electric motor and to a battery, wherein the inverter comprises a switch, a bypass switch, a capacitor pre-charge switch, and a capacitor,
wherein the capacitor pre-charge switch is located between a positive terminal of a charging station and the switch, closable based on a type of the charging station,
wherein the controller closes the switch to pre-charge the capacitor via the battery using the inverter and the three-phase electric motor in a buck mode, to a defined fraction of a voltage of the battery, in response to a determination, by the controller, that the charging station connected to an electric vehicle comprises a maximum output voltage lower than a maximum voltage of the battery,
wherein the controller closes the bypass switch to charge the battery directly from the charging station, without using the three-phase electric motor and the inverter for a boost operation, in response to a determination that the maximum voltage of the battery is lower than or equal to the maximum output voltage of the charging station,
wherein the battery is charged using the capacitor, inverter, and three-phase electric motor when the charging station comprises an output voltage lower than the voltage of the battery, and
wherein based on a type of the charging station, the controller closes the capacitor pre-charge switch:
in response to a determination that the capacitor has been pre-charged to a voltage difference of less than or equal to 20V of the output voltage of the charging station, or
in response to a determination that the capacitor has been pre-charged to at least half of the voltage of the battery.