Patents by Inventor Gangqi Cen

Gangqi Cen has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Non-isolated DC fast charger for electrified vehicles
    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
  • NON-ISOLATED DC FAST CHARGER FOR ELECTRIFIED VEHICLES
    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