Patents by Inventor Yuusuke Arao

Yuusuke Arao 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).

  • Power conversion device and method for controlling thereof
    Patent number: 8710781
    Abstract: In a power conversion device that includes a PWM converting means for generating a PWM pulse by comparing three-phase voltage commands with a triangular wave carrier signal, a power converter for converting between a DC voltage and a three-phase AC voltage by driving a switching element according to the PWM pulse, a current detecting means for detecting a pulsed current flowing through a DC bus conductor of a main circuit, and a voltage command correcting means for correcting three-phase voltage commands, which corrects the three-phase voltage commands so that a line voltage value between the maximum phase and an intermediate phase and a line voltage value between the intermediate phase and the minimum phase are each equal to or larger than a predetermined value, the maximum phase, intermediate phase, and minimum phase being determined in correspondence to momentary values of the three-phase voltage commands arranged in descending order, if the voltage command is outside an allowable upper limit or lower limi
    Type: Grant
    Filed: February 17, 2010
    Date of Patent: April 29, 2014
    Assignee: Hitachi Industrial Equipment Systems Co., Ltd.
    Inventors: Yoichiro Arakawa, Koichiro Nagata, Yuusuke Arao, Shigehisa Aoyagi
  • POWER CONVERSION DEVICE AND METHOD FOR CONTROLLING THEREOF
    Publication number: 20110292700
    Abstract: In a power conversion device that includes a PWM converting means for generating a PWM pulse by comparing three-phase voltage commands with a triangular wave carrier signal, a power converter for converting between a DC voltage and a three-phase AC voltage by driving a switching element according to the PWM pulse, a current detecting means for detecting a pulsed current flowing through a DC bus conductor of a main circuit, and a voltage command correcting means for correcting three-phase voltage commands, which corrects the three-phase voltage commands so that a line voltage value between the maximum phase and an intermediate phase and a line voltage value between the intermediate phase and the minimum phase are each equal to or larger than a predetermined value, the maximum phase, intermediate phase, and minimum phase being determined in correspondence to momentary values of the three-phase voltage commands arranged in descending order, if the voltage command is outside an allowable upper limit or lower limi
    Type: Application
    Filed: February 17, 2010
    Publication date: December 1, 2011
    Inventors: Yoichiro Arakawa, Koichiro Nagata, Yuusuke Arao, Shigehisa Aoyagi