Patents by Inventor Hiroki SHIGETA

Hiroki SHIGETA 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).

  • Patent number: 11075540
    Abstract: In a first power feeding mode, a controller supplies AC power output by an inverter to a load. In a second power feeding mode, the controller supplies AC power supplied from an AC power supply to the load. The controller switches an operation mode to the first power feeding mode when a voltage drop of the AC power supply is detected during the second power feeding mode. The controller, for a prescribed time period from detection of the voltage drop, causes a converter to perform reverse conversion to convert DC power output by a power storage device to AC power, and controls the reverse conversion in the converter such that an instantaneous value of an AC voltage output from the converter becomes equal to or higher than an instantaneous value of an AC voltage output from the inverter.
    Type: Grant
    Filed: July 23, 2018
    Date of Patent: July 27, 2021
    Assignee: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventor: Hiroki Shigeta
  • Publication number: 20210135488
    Abstract: An uninterruptible power supply device includes: a converter that converts AC power supplied from an AC power supply into DC power and outputs the DC power to a first power supply node; a first bidirectional chopper that outputs DC power in a lead storage device to the first power supply node when the AC power supply has a power failure; a diode connected between the first power supply node and a second power supply node; a second bidirectional chopper that supplies and receives DC power between the second power supply node and a lithium ion battery; and a controller that controls the second bidirectional chopper to charge the lithium ion battery during regenerative operation of a load and to discharge the lithium ion battery during power running operation of the load.
    Type: Application
    Filed: July 4, 2018
    Publication date: May 6, 2021
    Applicant: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventors: Masaru TOYODA, Hiroki SHIGETA
  • Publication number: 20210028719
    Abstract: A controller (5) of an uninterruptible power supply apparatus includes: first to sixth comparator circuits (22a to 22f) respectively provided corresponding to first to sixth IGBTs (Q1 to Q6) and outputting, based on a comparison result of the magnitude of three-phase AC voltages, signals (A1 to A6) indicating that a corresponding IGBT is to be turned on; and a control unit (23) that, when a voltage between terminals (VD1 or VD2) of a first or second capacitor (C11 or C12) is higher than a target voltage (VDT), turns on and off each of the first to sixth IGBTs based on signals output from the first to sixth comparator circuits to decrease the voltage between terminals of the first or second capacitor.
    Type: Application
    Filed: April 6, 2018
    Publication date: January 28, 2021
    Applicant: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventors: Hiroki SHIGETA, Toshihide NAKANO
  • Publication number: 20200295595
    Abstract: In a first power feeding mode, a controller supplies AC power output by an inverter to a load. In a second power feeding mode, the controller supplies AC power supplied from an AC power supply to the load. The controller switches an operation mode to the first power feeding mode when a voltage drop of the AC power supply is detected during the second power feeding mode. The controller, for a prescribed time period from detection of the voltage drop, causes a converter to perform reverse conversion to convert DC power output by a power storage device to AC power, and controls the reverse conversion in the converter such that an instantaneous value of an AC voltage output from the converter becomes equal to or higher than an instantaneous value of an AC voltage output from the inverter.
    Type: Application
    Filed: July 23, 2018
    Publication date: September 17, 2020
    Applicant: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventor: Hiroki SHIGETA
  • Publication number: 20200186147
    Abstract: An AC switch (1) includes a first thyristor (T1), a second thyristor (T2), a third thyristor (T3), and a fourth thyristor (T4). The first thyristor (T1) has an anode connected to an AC power source (2), and a cathode connected to a load (3). The second thyristor (T2) is connected in antiparallel to the first thyristor (T1). The third thyristor (T3) has an anode connected to the AC power source (2), and a cathode connected to the load (3). The fourth thyristor (T4) is connected in antiparallel to the third thyristor (T3). A current detector (5) detects the AC current supplied from the AC power source (2) to the load (3). A controller (6) causes the first thyristor (T1) and the third thyristor (T3) to conduct alternately and causes the second thyristor (T2) and the fourth thyristor (T4) to conduct alternately, for each one-cycle period of the AC current, in accordance with the detection value from the current detector (5).
    Type: Application
    Filed: July 27, 2017
    Publication date: June 11, 2020
    Applicant: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventors: Hiroki SHIGETA, Toshihide NAKANO