Patents by Inventor Isao Tanatsugu

Isao Tanatsugu 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).

  • Three-phase rectifier
    Patent number: 7187566
    Abstract: A capacitor-input type three-phase rectification circuit comprises a three-phase AC power supply (1), a diode rectifier circuit (4), and a low-frequency filter connected between the three-phase AC power supply (1) and the diode rectification circuitry (4), the low frequency filter consisting of AC reactors (2u)(2v)(2w) and ?-connection or Y-connection capacitors (8u)(8v)(8w), so that higher harmonic currents are reduced to be equal to or less than standard values, and that lowering in input power factor and lowering in DC voltage are prevented from occurrence.
    Type: Grant
    Filed: March 16, 2001
    Date of Patent: March 6, 2007
    Assignee: Daikin Industries, Ltd.
    Inventors: Reiji Kawashima, Kenichi Sakakibara, Sumio Kagimura, Isao Tanatsugu
  • Three-phase rectifier
    Publication number: 20030161168
    Abstract: A capacitor-input type three-phase rectification circuit comprises a three-phase AC power supply (1), a diode rectifier circuit (4), and a low-frequency filter connected between the three-phase AC power supply (1) and the diode rectification circuitry (4), the low frequency filter consisting of AC reactors (2u)(2v)(2w) and &Dgr;-connection or Y-connection capacitors (8u)(8v)(8w), so that higher harmonic currents are reduced to be equal to or less than standard values, and that lowering in input power factor and lowering in DC voltage are prevented from occurrence.
    Type: Application
    Filed: April 1, 2003
    Publication date: August 28, 2003
    Inventors: Reiji Kawashima, Kenichi Sakakibara, Sumio Kagimura, Isao Tanatsugu