Patents by Inventor Chris Van Kalken

Chris Van Kalken 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).

  • Current sensor apparatus and method for uninterruptible power supply
    Patent number: 7550872
    Abstract: A UPS has a current sensor for controlling operation of a UPS main power circuit positioned in series with the AC supply voltage so as to measure the net current used by each component connected to the UPS main power circuit. Feedback from the current sensor received by a control circuit is used to achieve unity power factor operation with the UPS. The current sensor location and operation is adaptable to both single phase and three phase operation.
    Type: Grant
    Filed: December 19, 2006
    Date of Patent: June 23, 2009
    Assignee: General Electric Company
    Inventors: Fokke Hoekstra, Robert Zijlstra, Chris van Kalken, Rajendra Naik, Pradeep V
  • CURRENT SENSOR APPARATUS AND METHOD FOR UNINTERRUPTIBLE POWER SUPPLY
    Publication number: 20080143187
    Abstract: A UPS has a current sensor for controlling operation of a UPS main power circuit positioned in series with the AC supply voltage so as to measure the net current used by each component connected to the UPS main power circuit. Feedback from the current sensor received by a control circuit is used to achieve unity power factor operation with the UPS. The current sensor location and operation is adaptable to both single phase and three phase operation.
    Type: Application
    Filed: December 19, 2006
    Publication date: June 19, 2008
    Inventors: Fokke Hoekstra, Robert Zijlstra, Chris van Kalken, Rajendra Naik, Pradeep V
  • AC/DC converter and method of modulation thereof
    Patent number: 7375989
    Abstract: A method and apparatus for modulating a discontinuous conduction mode (DCM) Boost Rectifier having a switchable booster section is disclosed. A modulation signal is defined according to the equation, TON(?)=f1(?)+f2(?)+f3(?). Here, ? defines a phase angle for an input phase voltage of the DCM Boost Rectifier; TON(?) defines a modulation characteristic for an ON time of the booster section, and is a continuous function; f1(?) defines a first function from 0????/3; f2(?) defines a second function from ?/3???2?/3; and, f3(?) defines a third function from 2?/3????. The switchable booster section is then modulated using the modulation signal.
    Type: Grant
    Filed: September 28, 2005
    Date of Patent: May 20, 2008
    Assignee: General Electric Company
    Inventors: Silvio Colombi, Nicolas Borgeaud, Chris Van Kalken
  • AC/DC converter and method of modulation thereof
    Publication number: 20060164873
    Abstract: A method and apparatus for modulating a discontinuous conduction mode (DCM) Boost Rectifier having a switchable booster section is disclosed. A modulation signal is defined according to the equation, TON(?)=f1(?)+f2(?)+f3(?). Here, ? defines a phase angle for an input phase voltage of the DCM Boost Rectifier; TON(?) defines a modulation characteristic for an ON time of the booster section, and is a continuous function; f1(?) defines a first function from 0????/3; f2(?) defines a second function from ?/3???2?/3; and, f3(?) defines a third function from 2?/3????. The switchable booster section is then modulated using the modulation signal.
    Type: Application
    Filed: September 28, 2005
    Publication date: July 27, 2006
    Inventors: Silvio Colombi, Nicolas Borgeaud, Chris Van Kalken