Patents by Inventor Tsuyoshi Okano

Tsuyoshi Okano 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).

  • Method for controlling power factor of three-phase converter, method for controlling reactive power of three-phase converter, and controller of three-phase converter
    Patent number: 8797003
    Abstract: In power conversion according to the three-phase converter, symmetrical component voltage values of a balanced system are calculated from wye-phase voltages on the three-phase AC input side of the three-phase converter. On the DC output side thereof, the power factor is set, an average active power value is calculated from an output voltage value and an output current value, and an average reactive power is calculated from the set power factor. On the basis of the symmetrical component voltage values, the average active power, and the active reactive power, a compensation signal for compensating for unbalanced voltages of the three-phase AC voltages and a control signal for controlling the power factor are generated, and according to the compensation signal and the control signal, a control signal for outputting DC is generated.
    Type: Grant
    Filed: December 7, 2011
    Date of Patent: August 5, 2014
    Assignee: Kyosan Electric MFG. Co., Ltd.
    Inventors: Itsuo Yuzurihara, Atsushi Takayanagi, Yoshihisa Hata, Tsuyoshi Okano
  • METHOD FOR CONTROLLING POWER FACTOR OF THREE-PHASE CONVERTER, METHOD FOR CONTROLLING REACTIVE POWER OF THREE-PHASE CONVERTER, AND CONTROLLER OF THREE-PHASE CONVERTER
    Publication number: 20120212191
    Abstract: In power conversion according to the three-phase converter, symmetrical component voltage values of a balanced system are calculated from wye-phase voltages on the three-phase AC input side of the three-phase converter. On the DC output side thereof, the power factor is set, an average active power value is calculated from an output voltage value and an output current value, and an average reactive power is calculated from the set power factor. On the basis of the symmetrical component voltage values, the average active power, and the active reactive power, a compensation signal for compensating for unbalanced voltages of the three-phase AC voltages and a control signal for controlling the power factor are generated, and according to the compensation signal and the control signal, a control signal for outputting DC is generated.
    Type: Application
    Filed: December 7, 2011
    Publication date: August 23, 2012
    Applicant: KYOSAN ELECTRIC MFG. CO., LTD.
    Inventors: Itsuo Yuzurihara, Atsushi Takayanagi, Yoshihisa Hata, Tsuyoshi Okano