Patents by Inventor Richard Lukaszewski

Richard Lukaszewski 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).

  • Publication number: 20070030706
    Abstract: A compensator circuit for reducing low order current harmonics in a three-phase drive system driving a single-phase load, the three-phase drive system including a three-phase source voltage connected to a rectifier system connected to a DC link capacitor connected to a three-phase voltage source inverter that supplies three-phase power.
    Type: Application
    Filed: August 1, 2006
    Publication date: February 8, 2007
    Inventors: Lixiang Wei, Gary Skibinski, Richard Lukaszewski
  • Publication number: 20070030707
    Abstract: The present invention is directed to an auxiliary circuit for reducing low order current harmonics in a three-phase drive system driving a single-phase load, the three-phase drive system including a three-phase source voltage connected to a rectifier system connected to a DC link choke inductor connected to a three-phase current source inverter system.
    Type: Application
    Filed: August 1, 2006
    Publication date: February 8, 2007
    Inventors: Lixiang Wei, Gary Skibinski, Richard Lukaszewski
  • Publication number: 20070030708
    Abstract: The present invention is directed to a compensator-filter circuit for reducing low order current harmonics in a three-phase drive system driving a single-phase load, the three-phase drive system including a three-phase source voltage connected to a rectifier system connected to a DC link capacitor connected to a three-phase voltage source inverter.
    Type: Application
    Filed: August 1, 2006
    Publication date: February 8, 2007
    Inventors: Lixiang Wei, Gary Skibinski, Richard Lukaszewski
  • Publication number: 20060267542
    Abstract: A method for controlling a device including a plurality of switching devices operated in accordance with a pulse width modulation technique includes receiving a reference voltage signal associated with a first pair of the switching devices. A switching signal is generated. The first pair of switching devices are controlled based on the reference voltage signal and the switching signal in accordance with the pulse width modulation technique. A frequency of the switching signal is varied based on the value of the reference voltage signal.
    Type: Application
    Filed: May 27, 2005
    Publication date: November 30, 2006
    Inventors: Lixiang Wei, Richard Lukaszewski
  • Publication number: 20060227582
    Abstract: A rectifier includes a transformer, a rectifying bridge, a link capacitor, and at least a first resonance loop. The transformer is operable to receive three phase input signals having a source frequency and generate a plurality of transformer phase signals. The rectifying bridge has a number of stages corresponding to the number of transformer phase signals and is operable to generate a rectified output signal based on the transformer phase signals. The link capacitor is coupled across the rectifying bridge. The first resonance loop is coupled between the rectifying bridge and the link capacitor. The first resonance loop has a first resonance frequency corresponding to a harmonic frequency of the source frequency.
    Type: Application
    Filed: March 31, 2005
    Publication date: October 12, 2006
    Inventors: Lixiang Wei, Gary Skibinski, Richard Lukaszewski
  • Publication number: 20060192520
    Abstract: Methods and apparatus for canceling dead time effects in the form of common mode voltages produced by a three-phase power conversion device in a rectifier/inverter variable frequency drive (VFD) system includes limiting the voltage difference between phase voltages at certain switching transition times to an amount ?, that is a function of the dead time that is specified for the switches and delaying gating signals to the switches to remove unexpected pulses produced by common mode voltages.
    Type: Application
    Filed: February 28, 2005
    Publication date: August 31, 2006
    Inventors: Qiang Yin, Russel Kerkman, Richard Lukaszewski