US 11,052,782 B1
Onboard field weakened AC charger
Nicholas A. Lemberg, Endwell, NY (US); and Peter A. Carruthers, Ithaca, NY (US)
Assigned to BAE Systems Controls Inc., Endicott, NY (US)
Appl. No. 17/41,167
Filed by BAE Systems Controls Inc., Endicott, NY (US)
PCT Filed Apr. 10, 2020, PCT No. PCT/US2020/027781
§ 371(c)(1), (2) Date Sep. 24, 2020,
.
Int. Cl. B60L 53/62 (2019.01); H02J 7/00 (2006.01); B60L 53/50 (2019.01); H02J 7/04 (2006.01)
CPC B60L 53/62 (2019.02) [B60L 53/50 (2019.02); H02J 7/04 (2013.01); H02J 2207/20 (2020.01)] 18 Claims
OG exemplary drawing
 
1. A charging system for a vehicle, the charging system being coupleable to an external three-phase AC power source and for charging an energy storage system in the vehicle, the charging system comprising:
one or more switches associated with each of the three-phases of the AC power source;
an AC filter comprising an inductor coupled to each phase of the three-phases of the AC power source;
conversion circuitry coupled to the inductor of each AC filter, the conversion circuitry configured to convert three-phase AC power received at its input terminals into DC power for a system DC bus and configured to supply an independently controllable real AC current and reactive AC current;
voltage sensors for detecting a voltage at each of the three-phases at the input terminals, respectively;
one or more switches associated with the energy storage system, where when the one or more switches associated with the energy storage system are open, the energy storage system is electrically isolated from the system DC bus;
a processor configured to:
close the one or more switches associated with each of the three-phases of the AC power source when a condition is satisfied;
determine a peak line-line voltage corresponding to the detected voltage at the input terminals of the conversion circuitry; and
compare the determined peak line-line voltage with a real time voltage of the energy storage system to be charged;
when the determined peak line-line voltage is larger than or equal to the real time voltage of the energy storage system, the processor is configured to:
calculate the reactive AC current to reduce the peak line-line voltage at the input terminals of the conversion circuitry to less than the real time voltage of the energy storage system;
cause the reactive AC current to be supplied by the conversion circuitry such that it flows through each inductor, reducing the peak line-line voltage at the input terminals of the conversion circuitry;
regulate the system DC bus to substantially match the real time voltage of the energy storage system; and
control the one or more switches associated with the energy storage system to close once the peak line-line voltage is less than the real time voltage of the energy storage system and the system DC bus voltage substantially matches the real time voltage of the energy storage system; wherein the energy storage system is charged after the control of the one or more switches associated with the energy storage system.