US 12,263,746 B2
Non-isolated DC fast charger for electrified vehicles
William-Michael Eull, New York, NY (US); Liwei Zhou, New York, NY (US); Weizhong Wang, New York, NY (US); Gangqi Cen, Tsim Sha Tsui (HK); and Matthias Preindl, New York, NY (US)
Assigned to The Trustees of Columbia University in the City of New York, New York, NY (US); and Longmax Corporation Ltd., Tsim Sha Tsui (HK)
Filed by The Trustees of Columbia University in the City of New York, New York, NY (US); and Longmax Corporation Ltd., Tsim Sha Tsui (HK)
Filed on Jan. 17, 2024, as Appl. No. 18/415,333.
Application 18/415,333 is a continuation of application No. 17/173,524, filed on Feb. 11, 2021, granted, now 11,912,147.
Claims priority of provisional application 62/979,935, filed on Feb. 21, 2020.
Prior Publication US 2024/0399907 A1, Dec. 5, 2024
Int. Cl. H02J 7/00 (2006.01); B60L 53/30 (2019.01); H02J 7/06 (2006.01); H02M 1/44 (2007.01); H02M 3/158 (2006.01); H02M 7/219 (2006.01)
CPC B60L 53/30 (2019.02) [H02J 7/06 (2013.01); H02M 1/44 (2013.01); H02M 3/158 (2013.01); H02M 7/219 (2013.01); B60L 2210/10 (2013.01); H02J 2207/20 (2020.01)] 20 Claims
OG exemplary drawing
 
1. A system for mitigating leakage currents in a charging station for electric vehicles comprising:
a bank of one or more parallel capacitors per phase electrically coupled to an AC voltage source, wherein a neutral point of the one or more parallel capacitors is electrically coupled to a DC ground;
a bank of one or more inductors per phase electrically coupled to the one or more parallel capacitors, wherein each inductor is in series with and downstream from one capacitor;
a rectifier electrically coupled to and downstream from the one or more parallel inductors, wherein the rectifier converts the AC voltage source to a DC voltage for supply to a battery;
a DC bus electrically coupled to the rectifier; and
a controller configured to mitigate leakage currents by controlling a voltage of at least one of the bank of one or more parallel capacitors.