Patents by Inventor Patrick Reginald Palmer

Patrick Reginald Palmer 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).

  • Power semiconductor devices
    Patent number: 8222671
    Abstract: This invention generally relates to power semiconductor devices, and in particular to improved thyristor devices and circuits. The techniques we describe are particularly useful for so-called MOS-gated thyristors. We describe a thyristor comprising a plurality of power thyristor devices connected in parallel, each said thyristor device being operable at a device current which the device has an on-resistance with a positive temperature coefficient.
    Type: Grant
    Filed: March 16, 2007
    Date of Patent: July 17, 2012
    Assignee: Cambridge Enterprises Limited
    Inventors: Patrick Reginald Palmer, Zhihan Wang
  • Controlling commutation of a power semiconductor switching device and freewheel diode pair
    Patent number: 8004317
    Abstract: This invention relates to a control method and a circuit for MOS-gated power semiconductor switching devices such as IGBTs or MOSFETs, which allows control and optimisition of the current and voltage commutation of a power semiconductor switching device and freewheel diode pair in the basic half-bridge circuit found in a wide range of equipment.
    Type: Grant
    Filed: September 10, 2007
    Date of Patent: August 23, 2011
    Assignee: Cambridge Enterprise Limited
    Inventors: Patrick Reginald Palmer, Yalan Wang, Angus Toby Bryant
  • CONTROL OF POWER SEMICONDUCTOR DEVICES
    Publication number: 20100060326
    Abstract: This invention relates to a control method and a circuit for MOS-gated power semiconductor switching devices such as IGBTs or MOSFETs, which allows control and optimisition of the current and voltage commutation of a power semiconductor switching device and freewheel diode pair in the basic half-bridge circuit found in a wide range of equipment.
    Type: Application
    Filed: September 10, 2007
    Publication date: March 11, 2010
    Applicant: Cambridge Enterprise Limited
    Inventors: Patrick Reginald Palmer, Yalan Wang, Angus Toby Bryant
  • Power Semiconductor Devices
    Publication number: 20070221949
    Abstract: This invention generally relates to power semiconductor devices, and in particular to improved thyristor devices and circuits. The techniques we describe are particularly useful for so-called MOS-gated thyristors. We describe a thyristor comprising a plurality of power thyristor devices connected in parallel, each said thyristor device being operable at a device current which the device has an on-resistance with a positive temperature coefficient.
    Type: Application
    Filed: March 16, 2007
    Publication date: September 27, 2007
    Inventors: Patrick Reginald Palmer, Zhihan Wang