Patents by Inventor Tessa H. Velasquez

Tessa H. Velasquez 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).

  • Low cost current mode control switching power supply without discrete current sense resistor
    Patent number: 5932996
    Abstract: A switching power supply that uses the intrinsic series resistance of an output bypass capacitor to sense changes in current flow through a switch that is connects between the input and output of the switching power supply. When the switch runs on, current flows from the input to the output and through a bypass capacitor. The intrinsic series resistance of the bypass capacitor develops a voltage across it as current flows through the capacitor. This voltage is used by a sense circuit to help determine when to shut off the switch. A low-cost regulator develops an output voltage that is divided and compared to a reference to determine if the input voltage is sufficient. If it is not, the power supply is not allowed to operate and the switch is not allowed to turn on.
    Type: Grant
    Filed: April 28, 1998
    Date of Patent: August 3, 1999
    Assignee: Hewlett-Packard Co.
    Inventors: Steven F. Liepe, Tessa H. Velasquez, Kenneth G. Richardson