Patents by Inventor Wai Chun Cheng

Wai Chun Cheng 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).

  • Electrical wiring device with high current USB charging capabilities
    Patent number: 8758031
    Abstract: The present invention is directed to an electrical wiring device that includes an AC power supply control circuit, an isolation interface circuit and a low voltage printed circuit board (PCB) assembly. The low voltage PCB assembly includes a universal serial bus (USB) charging interface circuit configured to convert the modulated power signal into a low voltage direct current (DC) charging signal. The at least one low voltage PCB assembly includes at least one USB socket coupled to the USB charging interface circuit and accessible via the at least one USB aperture formed in the front cover member. The USB charging interface circuit is configured to provide the low voltage DC charging signal to at least one device-under-charge at a maximum predetermined charging current.
    Type: Grant
    Filed: July 23, 2012
    Date of Patent: June 24, 2014
    Assignee: Pass & Seymour, Inc.
    Inventors: Wai Chun Cheng, Chung Fai Lam, Lorenzo Trolese
  • Electrical Wiring Device with High Current USB Charging Capabilities
    Publication number: 20130280956
    Abstract: The present invention is directed to an electrical wiring device that includes an AC power supply control circuit, an isolation interface circuit and a low voltage printed circuit board (PCB) assembly. The low voltage PCB assembly includes a universal serial bus (USB) charging interface circuit configured to convert the modulated power signal into a low voltage direct current (DC) charging signal. The at least one low voltage PCB assembly includes at least one USB socket coupled to the USB charging interface circuit and accessible via the at least one USB aperture formed in the front cover member. The USB charging interface circuit is configured to provide the low voltage DC charging signal to at least one device-under-charge at a maximum predetermined charging current.
    Type: Application
    Filed: July 23, 2012
    Publication date: October 24, 2013
    Applicant: PASS & SEYMOUR, INC.
    Inventors: Wai Chun Cheng, Chung Fai Lam, Lorenzo Trolese