Patents by Inventor Kazuki Toyama

Kazuki Toyama 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).

  • Electric power storage system using capacitors and control method thereof including serial-parallel switching means for each circuit block of batteries based on descending order of block voltages
    Patent number: 7898223
    Abstract: In an electric power storage system according to the present invention, in the case of charging, a plurality of capacitors of each circuit block of the electric power storage system are switched to a serial connection to initiate the charging. When the output voltage of power storage means reaches the maximum input voltage of DC-AC conversion means, each capacitor of a number j of circuit blocks is switched to a parallel connection in order of higher block voltage. Also up to the time when the maximum input voltage is reached again, each capacitor of a number j of circuit blocks is switched to a parallel connection in order of higher block voltage. In the case of discharging, pluralities of capacitors of each circuit block of the electric power storage system are switched to a parallel connection to initiate the discharging.
    Type: Grant
    Filed: October 19, 2005
    Date of Patent: March 1, 2011
    Assignee: Limited Company TM
    Inventors: Harumi Takeda, Kazuki Toyama
  • ELECTRIC POWER STORAGE SYSTEM USING CAPACITORS AND CONTROL METHOD THEREOF
    Publication number: 20090134851
    Abstract: In an electric power storage system according to the present invention, in the case of charging, a plurality of capacitors of each circuit block of the electric power storage system are switched to a serial connection to initiate the charging. When the output voltage of power storage means reaches the maximum input voltage of DC-AC conversion means, each capacitor of a number j of circuit blocks is switched to a parallel connection in order of higher block voltage. Also up to the time when the maximum input voltage is reached again, each capacitor of a number j of circuit blocks is switched to a parallel connection in order of higher block voltage. In the case of discharging, pluralities of capacitors of each circuit block of the electric power storage system are switched to a parallel connection to initiate the discharging.
    Type: Application
    Filed: October 19, 2005
    Publication date: May 28, 2009
    Inventors: Harumi Takeda, Kazuki Toyama