Patents by Inventor Eishi Matsuda

Eishi Matsuda 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).

  • Filter circuit and method of controlling same
    Patent number: 8148972
    Abstract: Disclosed is a filter circuit that includes means for monitoring currents flowing through positive and negative windings of a common-mode noise filter, and means for performing an adjustment based on the result of monitoring so as to equalize the current flowing positive and negative windings.
    Type: Grant
    Filed: March 6, 2009
    Date of Patent: April 3, 2012
    Assignee: NEC Corporation
    Inventors: Tsuyoshi Tsutsumi, Eishi Matsuda
  • FILTER CIRCUIT AND METHOD OF CONTROLLING SAME
    Publication number: 20090224735
    Abstract: Disclosed is a filter circuit that includes means for monitoring currents flowing through positive and negative windings of a common-mode noise filter, and means for performing an adjustment based on the result of monitoring so as to equalize the current flowing positive and negative windings.
    Type: Application
    Filed: March 6, 2009
    Publication date: September 10, 2009
    Inventors: Tsuyoshi Tsutsumi, Eishi Matsuda
  • Compact DC stabilized power supply capable of suppressing fluctuation of output voltage in spite of abrupt fluctuation of load current
    Patent number: 6873204
    Abstract: A DC stabilized power supply 10 for converting an inputted DC power supply voltage into a predetermined DC voltage includes a converting circuit 11, a first differentiating circuit 12 for differentiating variations in an output voltage of the converter circuit 11, a current absorbing circuit 13 driven by an output voltage of the first differentiating circuit 12, a second differentiating circuit 14 for differentiating variations in the output voltage of the converter circuit 11, and a current injecting circuit 15 driven by an output voltage of the second differentiating circuit 14.
    Type: Grant
    Filed: October 12, 2001
    Date of Patent: March 29, 2005
    Assignee: NEC Corporation
    Inventor: Eishi Matsuda
  • Compact DC stabilized power supply capable of suppressing fluctuation of output voltage in spite of abrupt fluctuation of load current
    Publication number: 20020043966
    Abstract: A DC stabilized power supply 10 for converting an inputted DC power supply voltage into a predetermined DC voltage includes a converting circuit 11, a first differentiating circuit 12 for differentiating variations in an output voltage of the converter circuit 11, a current absorbing circuit 13 driven by an output voltage of the first differentiating circuit 12, a second differentiating circuit 14 for differentiating variations in the output voltage of the converter circuit 11, and a current injecting circuit 15 driven by an output voltage of the second differentiating circuit 14.
    Type: Application
    Filed: October 12, 2001
    Publication date: April 18, 2002
    Applicant: NEC Corporation
    Inventor: Eishi Matsuda