Patents Assigned to Longmax Corporation Ltd.
  • Patent number: 11912147
    Abstract: A system may mitigate leakage currents in non-isolated charging stations for electric vehicles. The system may include 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, wherein the controller is configured to mitigate leakage currents by controlling a voltage of at least one of the bank of one or more parallel capacitors.
    Type: Grant
    Filed: February 11, 2021
    Date of Patent: February 27, 2024
    Assignees: The Trustees of Columbia University in the City of New York, Longmax Corporation LTD.
    Inventors: William-Michael Eull, Liwei Zhou, Weizhong Wang, Gangqi Cen, Matthias Preindl
  • Publication number: 20210261009
    Abstract: A system may mitigate leakage currents in non-isolated charging stations for electric vehicles. The system may include 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, wherein the controller is configured to mitigate leakage currents by controlling a voltage of at least one of the bank of one or more parallel capacitors.
    Type: Application
    Filed: February 11, 2021
    Publication date: August 26, 2021
    Applicants: The Trustees of Columbia University in the City of New York, Longmax Corporation Ltd.
    Inventors: William-Michael Eull, Liwei Zhou, Weizhong Wang, Gangqi Cen, Matthias Preindl