Patents by Inventor Takamitsu KATSUKI

Takamitsu KATSUKI 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 apparatus and power conversion method
    Patent number: 9515575
    Abstract: A controller of a power conversion apparatus according to an embodiment causes a chopper and an inverter to generate an alternating-current (AC) voltage including first and second parts of an AC voltage waveform and causes the inverter to output the AC voltage. The chopper generates the first part having an absolute value higher than a voltage of a DC power supply, and the inverter generates the second part having an absolute value lower than the voltage of the DC power supply. The controller is configured to alternately turn on the first and second switching elements in a period during which the controller controls the chopper to generate the first part of the AC voltage waveform.
    Type: Grant
    Filed: April 29, 2015
    Date of Patent: December 6, 2016
    Assignee: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Tetsumi Narita, Masato Higuchi, Yasuhiko Kawanami, Hidenori Hara, Takamitsu Katsuki
  • POWER CONVERSION APPARATUS AND POWER CONVERSION METHOD
    Publication number: 20150244287
    Abstract: A controller of a power conversion apparatus according to an embodiment causes a chopper and an inverter to generate an alternating-current (AC) voltage including first and second parts of an AC voltage waveform and causes the inverter to output the AC voltage. The chopper generates the first part having an absolute value higher than a voltage of a DC power supply, and the inverter generates the second part having an absolute value lower than the voltage of the DC power supply. The controller is configured to alternately turn on the first and second switching elements in a period during which the controller controls the chopper to generate the first part of the AC voltage waveform.
    Type: Application
    Filed: April 29, 2015
    Publication date: August 27, 2015
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Tetsumi NARITA, Masato HIGUCHI, Yasuhiko KAWANAMI, Hidenori HARA, Takamitsu KATSUKI