Patents by Inventor Orware Liu

Orware Liu 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).

  • Depletion mode MOSFET for overcurrent protection
    Patent number: 11374393
    Abstract: Circuits for providing overcurrent protection are disclosed herein. The circuits feature depletion mode MOSFETs connected to resistive elements, preferably, Positive Temperature Coefficient (PTC) devices, configured in such a way so that the voltage across the PTC device is the same as the gate-to-source voltage of the MOSFET. The circuit may further be configured using a TVS diode, for clamping the drain-to-source voltage of the MOSFET during the overcurrent events. Heat transfer between the MOSFET and the PTC device facilitates overcurrent protection. A two-terminal device including a depletion mode MOSFET, a PTC device, and a TVS diode may provide overcurrent protection to other circuits. A bidirectional circuit c including two MOSFETS disposed on either side of a PTC is also contemplated for AC voltage overcurrent protection.
    Type: Grant
    Filed: June 30, 2020
    Date of Patent: June 28, 2022
    Assignee: Littelfuse, Inc.
    Inventors: Jeff Chin, Neil LeJeune, Orware Liu, Teddy To
  • DEPLETION MODE MOSFET FOR OVERCURRENT PROTECTION
    Publication number: 20210408779
    Abstract: Circuits for providing overcurrent protection are disclosed herein. The circuits feature depletion mode MOSFETs connected to resistive elements, preferably, Positive Temperature Coefficient (PTC) devices, configured in such a way so that the voltage across the PTC device is the same as the gate-to-source voltage of the MOSFET. The circuit may further be configured using a TVS diode, for clamping the drain-to-source voltage of the MOSFET during the overcurrent events. Heat transfer between the MOSFET and the PTC device facilitates overcurrent protection. A two-terminal device including a depletion mode MOSFET, a PTC device, and a TVS diode may provide overcurrent protection to other circuits. A bidirectional circuit c including two MOSFETS disposed on either side of a PTC is also contemplated for AC voltage overcurrent protection.
    Type: Application
    Filed: June 30, 2020
    Publication date: December 30, 2021
    Applicant: Littelfuse, Inc.
    Inventors: Jeff Chin, Neil LeJeune, Orware Liu, Teddy To