Patents by Inventor Vijayin Joseph Thottuvelil

Vijayin Joseph Thottuvelil 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 factor control for switched mode rectifiers with improved representing of currents in EMI capacitive elements
    Patent number: 5777866
    Abstract: A power factor correction system with an EMI line filter at the input includes circuitry to sense the capacitor current of the EMI filter to improve the accuracy of the power factor enhancement. The circuitry consists of a current sensing means connected after the EMI filter, and a voltage sensing capacitor which derives its input signal from a pair of diodes separate from the conventional 4-diode rectifier bridge, which are connected either before or after the EMI filter. The current-sensing means, which may be a resistor, and the voltage-sensing capacitor are tightly coupled to the current control loop of the power factor correction system to compensate for the current in the EMI filter capacitors.
    Type: Grant
    Filed: January 27, 1997
    Date of Patent: July 7, 1998
    Assignee: Lucent Technologies Inc.
    Inventors: Mark Elliott Jacobs, Yimin Jiang, Vijayin Joseph Thottuvelil, Rui Liu