Patents by Inventor Akihiro Ishigaya

Akihiro Ishigaya 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 supply which starts or stops boosting based on an unbalanced state of the AC source
    Patent number: 10211718
    Abstract: According to one embodiment, when an effective value of an input current flowing into a booster circuit rises to a value greater than or equal to a second set value, boosting of the booster circuit is started and, after the start, when the effective value lowers to a value lower than a first set value lower than the second set value, boosting of the booster circuit is stopped. Then, if the three-phase AC source is in an unbalanced state, the first set value is set to a value lower than usual.
    Type: Grant
    Filed: April 16, 2018
    Date of Patent: February 19, 2019
    Assignee: TOSHIBA CARRIER CORPORATION
    Inventors: Keiichi Ishida, Akihiro Ishigaya, Masayuki Yoshimura
  • POWER SUPPLY APPARATUS
    Publication number: 20180301972
    Abstract: According to one embodiment, when an effective value of an input current flowing into a booster circuit rises to a value greater than or equal to a second set value, boosting of the booster circuit is started and, after the start, when the effective value lowers to a value lower than a first set value lower than the second set value, boosting of the booster circuit is stopped. Then, if the three-phase AC source is in an unbalanced state, the first set value is set to a value lower than usual.
    Type: Application
    Filed: April 16, 2018
    Publication date: October 18, 2018
    Applicant: Toshiba Carrier Corporation
    Inventors: Keiichi Ishida, Akihiro Ishigaya, Masayuki Yoshimura