Patents by Inventor Edward Chappell

Edward Chappell 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).

  • Electric motor drive isolation circuit
    Patent number: 9496708
    Abstract: An isolation circuit is coupled between motor driver half bridge circuits and an electric motor. A motor controller circuit supplies motor drive signals to the motor driver half bridge circuits. The isolation circuit includes transistors coupled in series with the motor windings. Low to medium power diodes are coupled between a reference voltage source and control terminals of the transistors.
    Type: Grant
    Filed: April 3, 2015
    Date of Patent: November 15, 2016
    Assignee: Allegro MicroSystems, LLC
    Inventors: Edward Chappell, Robert D. Christie, James McIntosh, Peter Morris
  • Electric Motor Drive Isolation Circuit
    Publication number: 20150288304
    Abstract: An isolation circuit is coupled between motor driver half bridge circuits and an electric motor. A motor controller circuit supplies motor drive signals to the motor driver half bridge circuits. The isolation circuit includes transistors coupled in series with the motor windings. Low to medium power diodes are coupled between a reference voltage source and control terminals of the transistors.
    Type: Application
    Filed: April 3, 2015
    Publication date: October 8, 2015
    Applicant: ALLEGRO MICROSYSTEMS, LLC
    Inventors: Edward Chappell, Robert D. Christie, James McIntosh, Peter Morris
  • Combined wrist wallet and phone holder
    Patent number: D691367
    Type: Grant
    Filed: January 13, 2013
    Date of Patent: October 15, 2013
    Inventor: Edward Chappell