Patents by Inventor Yosuke Kawanami

Yosuke Kawanami 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).

  • Bidirectional wireless power transmission system
    Patent number: 10938244
    Abstract: A first power transfer circuit in a first power transfer apparatus and a second power transfer circuit in a second power transfer apparatus are configured to be electrically symmetrical to each other. In transfer of electric power from one of the first and second power transfer apparatuses to the other of the first and second power transfer apparatuses, a controller drives a first switching circuit and a second switching circuit using a parallel resonant frequency of a complex resonant circuit as a reference frequency of an operating frequency. The controller changes the operating frequency to a frequency higher than the reference frequency or a frequency lower than the reference frequency if a duty ratio is maximized when transmitted electric power is lower than target electric power, which is a control target value, during the driving at the reference frequency.
    Type: Grant
    Filed: May 30, 2019
    Date of Patent: March 2, 2021
    Assignee: MURATA MANUFACTURING CO., LTD.
    Inventors: Yosuke Kawanami, Keiichi Ichikawa, Tsuyoshi Suesada
  • BIDIRECTIONAL WIRELESS POWER TRANSMISSION SYSTEM
    Publication number: 20190280529
    Abstract: A first power transfer circuit in a first power transfer apparatus and a second power transfer circuit in a second power transfer apparatus are configured to be electrically symmetrical to each other. In transfer of electric power from one of the first and second power transfer apparatuses to the other of the first and second power transfer apparatuses, a controller drives a first switching circuit and a second switching circuit using a parallel resonant frequency of a complex resonant circuit as a reference frequency of an operating frequency. The controller changes the operating frequency to a frequency higher than the reference frequency or a frequency lower than the reference frequency if a duty ratio is maximized when transmitted electric power is lower than target electric power, which is a control target value, during the driving at the reference frequency.
    Type: Application
    Filed: May 30, 2019
    Publication date: September 12, 2019
    Inventors: Yosuke Kawanami, Keiichi Ichikawa, Tsuyoshi Suesada