Patents by Inventor Hiromi Inabe

Hiromi Inabe 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).

  • Apparatus for compensating reactive power by current-source type converter
    Patent number: 4780660
    Abstract: A first apparatus for determining instantaneous reactive currents to determine instantaneous reactive currents in every phase of a three-phase load. Three phase current signals corresponding, respectively, to phase currents of the three-phase load supplied from a three-phase power-supply source are multiplied with sinusoidal wave signals of three phases, each of which has a phase difference of 90.degree. relative to the corresponding phase voltage of the three-phase power supply source to obtain the products for three phase, respectively, which products are added together to produce a sum signal. The instantaneous reactive currents mentioned above are determined on the basis of the sum signal and the three phase sinusoidal wave signals.
    Type: Grant
    Filed: September 25, 1987
    Date of Patent: October 25, 1988
    Assignee: Hitachi, Ltd.
    Inventors: Seiya Shima, Hiromi Inabe, Sadao Hokari