Patents by Inventor David M. Stover

David M. Stover 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).

  • Maintain power signature controller at power interface of PoE or PoDL system
    Patent number: 10263794
    Abstract: The invention pertains to systems where DC power is supplied by a PSE to a PD, such as over differential data wire pairs. IEEE standards require a minimum current to be drawn from the PD in order for the PSE to continue supplying the DC voltage. If the PD is in a low power mode, the PSE will normally discontinue supplying the DC voltage, which then requires a new detection and classification routine for powering up again. To avoid this, a “maintain power signature” controller provides a periodic current pulse by a current source connected between the PD input and the PD's full bridge rectifier. Any droop in the DC voltage that reverse biases the full bridge rectifier while the PD is in its low power mode will not affect the current pulse, so the PSE continues to supply the DC voltage.
    Type: Grant
    Filed: April 28, 2017
    Date of Patent: April 16, 2019
    Assignee: Linear Technology Corporation
    Inventors: Michael Paul, David M. Stover, Heath D. Stewart, Jeffrey L. Heath
  • MAINTAIN POWER SIGNATURE CONTROLLER AT POWER INTERFACE OF PoE OR PoDL SYSTEM
    Publication number: 20170338969
    Abstract: The invention pertains to systems where DC power is supplied by a PSE to a PD, such as over differential data wire pairs. IEEE standards require a minimum current to be drawn from the PD in order for the PSE to continue supplying the DC voltage. If the PD is in a low power mode, the PSE will normally discontinue supplying the DC voltage, which then requires a new detection and classification routine for powering up again. To avoid this, a “maintain power signature” controller provides a periodic current pulse by a current source connected between the PD input and the PD's full bridge rectifier. Any droop in the DC voltage that reverse biases the full bridge rectifier while the PD is in its low power mode will not affect the current pulse, so the PSE continues to supply the DC voltage.
    Type: Application
    Filed: April 28, 2017
    Publication date: November 23, 2017
    Inventors: Michael Paul, David M. Stover, Heath D. Stewart, Jeffrey L. Heath