Patents by Inventor Eimei Takahara

Eimei Takahara 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).

  • Single phase to three phase rectifier/inverter with DC ripple compensation
    Patent number: 4978894
    Abstract: In a power converter apparatus, variations contained in a single-phase AC input voltage cause a beat phenomenon in a three-phase DC/AC inverter. To avoid such a beat phenomenon, the single-phase AC input voltage is converted into a DC input voltage having ripple components and the ripple components are filtered from the input voltage so as to derive an input DC voltage. The input DC voltage is inserted into a three-phase AC voltage. Variations contained in the single-phase AC input voltage are detected to obtain a variation detecting signal and the inversion is controlled in a pulse width modulation control mode based upon the variation detecting signal and a reference signal.
    Type: Grant
    Filed: September 6, 1989
    Date of Patent: December 18, 1990
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Eimei Takahara