Patents by Inventor Ellery F. Schempp

Ellery F. Schempp 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).

  • Control circuit for cryogenically-cooled power electronics employed in power conversion systems
    Patent number: 5953224
    Abstract: A control circuit generates signals for controlling the sequence in which selected input signals are carried across the terminals of a polyphase switching conversion circuit. The control circuit includes switching elements galvanically isolated from the selected input signals with the control signals electrically isolated from the switching devices. The control circuit for the conversion circuit is, in essence, electrically isolated from the conversion circuit. The control circuit is configured to have a topology analogous to that of the switching converter and includes conventional switching diodes as well as a light generating device optically coupled to a light sensor which, in response to detection of light from the optically coupled light generating device, provides a control signal to a corresponding switching device. The control circuit also includes a source of regulated and electrically isolated power to operate drive circuitry for the switching devices.
    Type: Grant
    Filed: March 10, 1998
    Date of Patent: September 14, 1999
    Assignee: American Superconductor Corporation
    Inventors: Calman Gold, Otward Mueller, Ellery F. Schempp
  • Control circuit for cryogenically-cooled power electronics employed in power conversion systems
    Patent number: 5726873
    Abstract: A control circuit generates signals for controlling the sequence in which selected input signals are carried across the terminals of a polyphase switching conversion circuit. The control circuit includes switching elements galvanically isolated from the selected input signals with the control signals electrically isolated from the switching devices. The control circuit for the conversion circuit is, in essence, electrically isolated from the conversion circuit. The control circuit is configured to have a topology analogous to that of the switching converter and includes conventional switching diodes as well as a light generating device optically coupled to a light sensor which, in response to detection of light from the optically coupled light generating device, provides a control signal to a corresponding switching device. The control circuit also includes a source of regulated and electrically isolated power to operate drive circuitry for the switching devices.
    Type: Grant
    Filed: December 19, 1996
    Date of Patent: March 10, 1998
    Assignee: American Superconductor Corporation
    Inventors: Calman Gold, Otward Mueller, Ellery F. Schempp
  • Control circuit for cryogenically-cooled power electronics employed in power conversion systems
    Patent number: 5625548
    Abstract: A control circuit generates signals for controlling the sequence in which selected input signals are carried across the terminals of a polyphase switching conversion circuit. The control circuit includes switching elements galvanically isolated from the selected input signals with the control signals electrically isolated from the switching devices. The control circuit for the conversion circuit is, in essence, electrically isolated from the conversion circuit. The control circuit is configured to have a topology analogous to that of the switching converter and includes conventional switching diodes as well as a light generating device optically coupled to a light sensor which, in response to detection of light from the optically coupled light generating device, provides a control signal to a corresponding switching device. The control circuit also includes a source of regulated and electrically isolated power to operate drive circuitry for the switching devices.
    Type: Grant
    Filed: August 10, 1994
    Date of Patent: April 29, 1997
    Assignee: American Superconductor Corporation
    Inventors: Calman Gold, Otward Mueller, Ellery F. Schempp