Patents by Inventor Carl Ngai-Man Ho

Carl Ngai-Man Ho 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).

  • Uninterruptible power supply system with precharge converter
    Patent number: 10199859
    Abstract: An uninterruptable power supply system is disclosed with a precharge converter for connecting to a DC link of the uninterruptable power supply system to a DC power supply, whereby the DC link comprises a first and a second DC bus line, which are both coupled to a common reference point, whereby the common reference point can be an AC power supply neutral of the uninterruptable power supply system, comprising power connectors for connecting to the DC power supply, a first and second output connector for connecting to the first and the second DC bus line, respectively, a converter circuit for receiving DC power from the power connectors and providing DC power to the first and second output connector, and a control unit for controlling operation of the converter circuit.
    Type: Grant
    Filed: December 5, 2016
    Date of Patent: February 5, 2019
    Assignee: ABB Schweiz AG
    Inventors: Carl Ngai-Man Ho, Esa-Kai Paatero, Nicola Notari
  • UNINTERRUPTIBLE POWER SUPPLY SYSTEM WITH PRECHARGE CONVERTER
    Publication number: 20170085124
    Abstract: An uninterruptable power supply system is disclosed with a precharge converter for connecting to a DC link of the uninterruptable power supply system to a DC power supply, whereby the DC link comprises a first and a second DC bus line, which are both coupled to a common reference point, whereby the common reference point can be an AC power supply neutral of the uninterruptable power supply system, comprising power connectors for connecting to the DC power supply, a first and second output connector for connecting to the first and the second DC bus line, respectively, a converter circuit for receiving DC power from the power connectors and providing DC power to the first and second output connector, and a control unit for controlling operation of the converter circuit.
    Type: Application
    Filed: December 5, 2016
    Publication date: March 23, 2017
    Inventors: Carl Ngai-Man Ho, Esa-Kai Paatero, Nicola Notari